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TDS400 Series Digitizing Oscilloscopes Service Manual

Contents

1. Oc 3H TOTO ones TSO 1440 Figure 6 40 A26 Monitor Connector J440 9 J7 oo600 Pin 1 B 2592 lt m Pin 1 PM Figure 6 41 A07 Auxiliary Power Connectors J4 and J7 6 90 TDS 420A TDS 430A amp TDS 460A Service Manual Troubleshooting J2 Pin 1 00000000 I3 0000000 00000000 nnnnnnn cocoon nagnnnat db 000000
2. J8 Pin 1 J6 Pin 1 pjo0000000000000000W W Pin 1 een 96 gt o Bnew O ES yc 52 m T 10 3 6 a OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOD OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OO0O0000000000000000 OO00000000000000000 OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOD OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OO0000000D 000000000 OO0O000000U0 OO00000000000000000 OO0O0000000000000000 OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOD OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO 000000000 OO OO OO O OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO EE Figure 6 50 A01 Backplane Module 6 100 TDS 420A TDS 430A amp TDS 460A Service Manual W2 Pin 1 Troubleshooting Use this procedure to
3. Tektronix Service acute etr EX der EE Product Description Nominal Traits 5 e cese RUSSIE e ba ede Warranted Characteristics Typical Characteristics Installati n exa xa iue bah ka a Supplying Operating Power Operating Environment 21 Applying and Interrupting Repackaging Instructions 1 Installed 2 4 2 9 Ca eked ead Operating Information Screen Layout iioc ea d RERUM E eie Basic Procedures ieu enu uet eee ER a Theory of Operation Logic Conventions DEP ene LC Module Overview Performance Verification Performance Verification Procedures Brief SOLE TOSS 05255 Functional Tests xe een E Ic tee I ORG Performance Tests PLerequiSites p eR EP CL aeu ha VER ded Equipment Required 55 2 22 cnni ep RR DU Rr lest Record UC P EG ERES APR EE TDS
4. S 5 00000000000000 m QOOO0O00000000 4 2 2 ob OO M Rap a gt Q p 000000000000 e O Q 00000000000000 00000000000000 258 amp ghe CHITRIG CHSTRIG S O Trigger CH2TRIG S Signals H Q ES I EA i O CH4TRIG ag 2 O is E A05 Attenuator Board J101 Pin 1 OOOOOOOOOOOOOOOOLU OOOOOOOOOOOOOOOOO A08 Jumper Board Figure 6 46 A08 Jumper and A05 Attenuator Boards Signal Locations Table 6 14 Channel and P1 Signal Locations Trigger Vertical Vertical Inverted Channel Number P1 Pin Number P1 Pin Number P1 Pin Number 1 26 27 29 2 18 19 21 3 10 11 13 4 2 3 5 TDS 420A TDS 430A amp TDS 460A Service Manual 6 95 Troubleshooting Use this procedure to check the power to the A04 Acquisition and A05 Attenuator boards Using Table 6 16 and Figure 6 48 are the Perform the Low Voltage N04 Acquisition asear power supply voltages gp ok Using Table 6 15 and Figure 6 46 are the Perform the Low Voltage A05 Attenuator board power Power Supply supply troubleshooting procedure voltages ok Power to the A04 Acquisition and A05 Attenuator boards is ok Figure 6 47 Acquisition and Attenuator Power Troubleshooting Procedure Table 6 15 A05 Attenuator Board Power J101 Pin
5. 6 79 Figure 6 31 Primary Troubleshooting Procedure 6 80 Figure 6 32 A03 CPU Board Connector 6 81 Figure 6 33 Module Isolation Troubleshooting Procedure 6 82 Figure 6 34 Low Voltage Power Supply Troubleshooting Procedure 6 84 Figure 6 35 Power Supply Overload Troubleshooting Procedure 6 86 Figure 6 36 A25 Low Voltage Power Supply Module Right 6 6 87 Figure 6 37 Monitor Troubleshooting Procedure 6 88 Figure 6 38 Horizontal and Vertical Sync Signals 6 89 Figure 6 39 A Video Signal with White Black and Blanking 6 89 Figure 6 40 A26 Monitor Connector J440 6 90 Figure 6 41 A07 Auxiliary Power Connectors J4 and J7 6 90 Figure 6 42 A02 Display Connector J2 6 91 Figure 6 43 Processor Front Panel Troubleshooting Procedure 6 92 Figure 6 44 A06 Front Panel Board Power Connectors JI01 3106 6 93 Figure 6 45 Attenuator Acquisition Troubleshooting Procedure 6 94 Figure 6 46 A08 Jumper and A05 Attenuator Boards Signal Locations 6 95 Figure 6 47 Acquisition and Attenuator Power Troubleshooting Procedure 6 96 Figure 6 48 A04 Acquisition Board Po
6. Does the Yes oscilloscope power up Yes No Replace the bad board No Yes Replace the A01 Backplane module No Replace the A01 Backplane module Replace either the A06 Front Panel A01 Backplane or A07 Auxiliary Power boards Are there intermittent problems Yes Are there still problems No There is not a problem with the A01 Backplane Yes Replace the A01 Backplane module Figure 6 49 Backplane Troubleshooting Procedure 6 98 TDS 420A TDS 430A amp TDS 460A Service Manual Troubleshooting Table 6 17 Regulator Voltages Regulator Nominal Voltage Minimum Voltage Maximum Voltage U1 pin 3 12V M 5V 12 5 V U2 pin 3 42V 11 5 V 42 5 V U3 pin 2 46 3 V 5 07 V 6 57 V U4 3 5 4 8 V 5 2 V Table 6 18 J7 Voltages Pin Nominal Voltage Minimum Voltage Maximum Voltage 1 15V 14 85 V 15 15 V 2 15V 14 85 V 15 15 V 7 6 4V 6 336 V 6 464 V 8 15 V 114 85 V 115 15 V 9 115 V 114 85 V 115 15 V 18 15 1 V 15 151 V 5 05 V 19 15 1 V 15 151 V 5 05 V Table 6 19 J8 Front Panel Voltages Pin Nominal Voltage Minimum Voltage Maximum Voltage 1 115 V 114 25 V 115 75 V 2 5 5 05 5 15 V 4 5V 5 05 V 5 2V 5 15V 14 85 V 15 15 V TDS 420A TDS 430A amp TDS 460A Service Manual 6 99 Troubleshooting J7 Pin 1 lt
7. 10 PINS NOBLOCK DIAGRAMS LINE FILTER FOR THESE BOARDS THESE REPLACEABLE CABLES ARE LISTED IN SECTION 10 5 D PINS E 2 PINS A07 AUXILIARY POWER Figure 9 1 TDS 400A Interconnections B010100 B079999 9 2 TDS 420A TDS 430A amp TDS 460A Service Manual Diagrams A03 CPU TO BT10 FLOPPY RS 232 a 10 PINS ue 3 0V DRIVE J2 DIAG PORT oris P uM E GPIB IEEE STD Cw PINS 488 ET J4 P1 amp P2 J3 2 10 ure rpms b PINS 98 Bie J8 s 5 PINS 4 Wi 1 18 TERMINATIONS 2 20 TO p B 2 PINS 1 amp 3 Pt amp P2 98 Le 98 i 98 PINS p ay 98 PINS E IE 50 2 E A09 DSP ms P l E RS 232 9 PINS DTE oum VIDEO J7 VGA 15 PINS OUTPUT BS amp P2 E a 50 PINS 98 PINS 45 98 5 A10 SERPAR al 8 PINS A02 DISPLAY J7 22 PINS J6 10 PINS A01 BACKPLANE J901 10 PINS A26 MONITOR Figure 9 2 TDS 400A Interconnections B010100 B079999 Cont TDS 420A TDS 430A amp TDS 460A Service Manual 9 3 Diagrams ATTENUATORS A08 34 ACQUISITION JUMPER SYSTEM TDS 420A amp TDS 460A ONLY TDS 420A amp TDS 460A ONLY A05 ATTENUATOR A04 ACQUISITION PROBE CODING 50 INTERFACE FRONT PANEL A15 SWITCHES MENU SWITCHES FRONT PANEL A17 BEZEL BUTTON FRONT PANEL PROBE GND COMPENSATION
8. DC Calibrator Dual Banana to a BNC Adapters BNC T Connector 50 Q Coaxial Cables Figure 4 12 Initial Test Hookup b Initialize the oscilloscope Press save recall Setup 4 38 TDS 420A TDS 430A amp TDS 460A Service Manual Performance Tests Press the main menu button Recall Factory Setup Press the side menu button OK Confirm Factory Init 2 Confirm Main trigger system is within limits for Trigger level Threshold accuracy a Display the test signal Set the vertical SCALE to 50 mV Set the standard output of a DC calibration generator to 0 3 V b Measure the test signal Press SET LEVEL TO 50 Press TRIGGER MENU Read the measurement results from the readout below the label Level in the menu rather than from the trigger readout in the graticule area c Check against limits Subtract the trigger level readout from the DC calibration generator setting The result is the trigger level accuracy CHECK that the trigger level is accurate to within 18 mV Press TRIGGER MENU Press the main menu button Slope then press the side menu button for negative slope See icon at left Repeat substep b Subtract the trigger level readout from the DC calibration generator setting The result is the trigger level accuracy CHECK that the trigger level is accurate to within 18 mV 3 Confirm Delayed trigger system is within lim
9. lt Board Support 3 A08 Jumper Board Figure 6 16 A08 Jumper board assembly D1 Bus and board supports removal 6 44 TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures 6 Reinstallation Do steps 3 through 5 reversing instructions in each step to reinstall any module removed A03 CPU Assembly 1 Access the module Be sure you have performed the Access Procedure on page 6 13 and removed the modules as instructed 2 Assemble equipment and locate modules to be removed Have handy a screwdriver with a size T 15 Torx tip Items 1 and 2 Locate the modules to be removed in the locator diagram Internal Modules Figure 6 3 page 6 19 3 Orient the digitizing oscilloscope Set the digitizing oscilloscope so its left side is down with its front facing to the left of you 4 Remove the CPU board Using Figure 6 17 as a guide perform the following substeps a Unplug the CPU to front panel cable from the CPU assembly at J101 b Lift up on the two locking tabs on J500 of the CPU assembly c Remove the cable from the drive d Remove the single T 15 Torx 9 screw from the bracket covering the unused rear panel slot at the inside rear corner of the main chassis or the two screws from the bracket that secures the option assembly at the inside rear corner of the main chassis e Remove the single T 15 screw from the bracket that secures the CPU assembly at the inside r
10. p f 1 Delayed Runs cc d ane EUM M RM 5005 After Main laye Trig Menu Clock Internal Oo CO t2 co Main menu display area Readouts in lower graticule area move here when CLEAR MENU is pressed Figure 2 1 Map of Display Functions Push the HELP front panel button to enter help mode Front panel knobs and buttons now display information about their function when turned or pushed Push HELP again to exit help mode To get help information on a menu item display the menu desired if you are in help mode exit help first Push HELP Now the menu buttons display information about their function when pushed Push the SHIFT button and then press the STATUS front panel button Then press the STATUS main menu button to display the status menu The messages reflect the state of the acquisition system whether it is running or stopped and if it is stopped why as well as setup related information TDS 420A TDS 430A amp TDS 460A Service Manual Operating Information Setting Functions You set most functions by either using one or two front panel buttons or knobs or by pushing a front panel button to use a main menu and then a side menu to set the function The following steps illustrate both procedures 1 Locate the block that contains the function to be set Vertical Controls and Horizon
11. S sS S S S 8 S 8 bo e e Ss 8 g ES E E Cj ap sae a Do S S 8 S E S S sS S 8 amp 8 B cos B4 JS E E s 2 S S S g S S S B c ye ME E S S sS S S B S 8 S S Bh Go S ot A04 Acquisition Board J7 Pin 1 Figure 6 48 A04 Acquisition Board Power Connector TDS 420A TDS 430A amp TDS 460A Service Manual 6 97 Troubleshooting Use this procedure to troubleshoot the A01 Backplane board Press the ON STBY button Are the Does the Yes voltages at U1 U4 ok N Replace the oscilloscope 1 see Table 6 17 and A01 Backplane power up Figure module 6 50 Yes Disconnect P2 between the A07 Auxiliary Power and A25 Low Voltage Power Supply modules Press the ON STBY button Are the voltages at J7 ok see Table 6 18 and Figure 6 50 Perform the A25 Low Voltage Power Supply troubleshooting procedure Does the oscilloscope power up Replace the A25 Low Voltage Power Supply board Yes Are the voltages at J8 ok Ne Replace Me see Table 6 19 Backplane module Reconnect P2 Press the ON STBY button Yes Does one of the plug in boards not work but the other boards do Does the bad board work in another A01 Backplane slot
12. f If present remove the screw securing the spacer to the drive and lift the spacer away from the drive to complete the removal 4 To reinstall the disk drive perform steps 3a 3f in reverse order 06 Front Panel 1 Access the module Be sure you have performed the Access Procedure on Assembly ESD Shield page 6 13 and removed the modules as instructed and Menu Flex and Probe Code Flex Circuits 2 Assemble equipment and locate modules to be removed a Have handy a flat bladed screwdriver Item 5 b Locate the modules to be removed in the locator diagram Cabinet and Front Panel Mounted Modules Figure 6 2 on page 6 16 3 Orient the oscilloscope Set the oscilloscope so its bottom is down on the work surface and its front is facing you 4 Remove the front panel assembly a Insert a flat bladed screwdriver Item into the slot at the front right of the chassis Push inwards to release the snap lock at the right side see Figure 6 12 b Lift the front panel assembly out of the front of the main chassis until you can reach the interconnect cables connecting it to various other modules c Unplug the following cables from their jacks on the front panel assembly m The menu flex circuit at J103 The probe code flex circuit at J104 m CPU to front panel cable at J101 m The backplane to front panel cable at J106 d Finally lift the front panel assembly out of the front of the main chassis to complete the
13. Follow the instructions in Figure 5 6 to remove the probe body covers TDS 420A TDS 430A amp TDS 460A Service Manual 5 15 Adjustment Procedures Use a small standard screw driver to pry between the cover and metal cord connector to pop off cover Repeat for lower cover Figure 5 6 Exposing the Probe Body b Hook up test signal source Connect the high amplitude output of a pulse generator through a 50 Q precision cable to the input of the pulse generator head see Figure 5 7 m Connect the output of the pulse generator head through a 10X attenuator to CH 1 m Set the triggering level of the pulse generator head to minimum Digitizing Oscilloscope Pulse Generator Output 10X Attenuator Pulse Generator Head Precision Cable Figure 5 7 Initial Test Hookup c Initialize the oscilloscope Press save recall SETUP 5 16 TDS 420A TDS 430A amp TDS 460A Service Manual Adjustment Procedures Press the main menu button Recall Factory Setup Press the side menu button OK Confirm Factory Init d Modify the initialized front panel control settings Set vertical SCALE to 5 mV Press VERTICAL MENU Then press the main menu button Coupling Press the side menu button to toggle to 50 coupling Press SHIFT Then press ACQUIRE MENU Press the main menu button Mode Then press the side menu button Hi Res Press C
14. Position of Waveform Record Relative to the Screen and Display Only Intensified Waveform Reference Ado Symbols Ground Levels Pht bie EN e eee po beide and Waveform Sources m due c Delayed ni Delayed Runs Graticule and Waveforms 2 E After Main Vertical Scale Horizontal 5 00 V Scale and Trigger Level Ch3 i00mv TE 1 007 50 0 6 Chi 7 20 Delayed frig Menu Horiz Controls Horiz Pos Cloun internal Readouts 1 rigger Record wn Position Length 50 qo Main menu display area Readouts in lower graticule area move here when CLEAR MENU is pressed Figure 4 1 Map of Display Functions TDS 420A TDS 430A amp TDS 460A Service Manual Side menu area Readouts for measurements move here when CLEAR MENU is pressed 4 3 Performance Verification Procedures 4 4 TDS 420A TDS 430A amp TDS 460A Service Manual SSS UU OS Brief Procedures The Self Tests use internal routines to confirm basic functionality and proper adjustment No test equipment is required to do these test procedures The Functional Tests use the probe adjust output at the front panel as a test signal source for further verifying that the oscill
15. TDS 420A TDS 430A amp TDS 460A Service Manual xi Service Safety Summary xii TDS 420A TDS 430A amp TDS 460A Service Manual Preface Manual Structure This service manual provides service information for the TDS 420A TDS 430A and TDS 460A Digitizing Oscilloscopes STOP If servicing a TDS 430A follow the procedures for the TDS 460A but ignore all references to CH 3 and CH 4 This manual is divided into Chapters such as Specifications and Theory of Operation Further it is divided into subsections such as Product Description and Removal and Installation Procedures Sections containing procedures also contain introductions to those procedures Be sure to read these introductions because they provide information needed to do the service correctly and efficiently A brief description of each manual chapter follows W Specifications contains a product description of the digitizing oscilloscope and tables of the characteristics and descriptions that apply to it m Operating Information is this chapter It includes a description of how this manual is structured as well as general information and operating instruc tions at the level needed to safely power on and service this oscilloscope A statement of the service strategy that this manual supports and instructions for shipment of the digitizing oscilloscope are found in this chapter m Theory of Operation contains circuit descriptions that support general service an
16. c Disconnect the test hookup Remove the test probe as desired Sine Wave Generator Leveling Procedure Some procedures in this manual require a sine wave generator to produce the necessary test signals If you do not have a leveled sine wave generator use one of the following procedures to level the output amplitude of your sine wave generator TDS 420A TDS 430A amp TDS 460A Service Manual 4 55 Performance Tests Procedure for Best Accuracy 4 56 Equipment Required Prerequisites Sine Wave Generator Output Sine Wave Generator Item 11 Level Meter and Power Sensor Item 12 Power Splitter Item 13 Two Male N to Female BNC Adapters Item 15 One precision coaxial cable Item 5 See page 4 15 Digitizing Oscilloscope Level Meter Q O Input OOS Power Splitter Attenuators if necessary Power Sensor Figure 4 23 Sine Wave Generator Leveling Equipment Setup 1 Install the test hookup Connect the equipment as shown in Figure 4 23 2 Set the Generator m Set the sine wave generator to a reference frequency of 10 MHz m Adjust the sine wave generator amplitude to the required number of divisions as measured by the digitizing oscilloscope 3 Record the reference level Note the reading on the level meter 4 Set the generator to the new frequency and refer
17. 1 Setup function using pop up menus Tek Run 100kS s Sample GPIB Address 1 Jconfiguration B Talk Listen Address amy 0 9 0 Config N 3 PIS ooy M 50 Chi Ov 18 gt ee Diag Err i Configure System Port lt 10 gt lt GPIB gt LUC Off Bus 17 16 a For some selections pushing a main menu button pops up a menu 18 of subfunctions Example Push SHIFT then push UTILITY Now push System 17 Note the pop up menu for System is set to I O input output All the main menu buttons to the right of the pop up menu are labeled with subfunctions of I O b Pushing the button that popped up the menu 17 toggles through the pop up menu choices Example Repeatedly push System to toggle through the pop up menu Notice the other main menu button labels change accordingly Toggle back to I O 2 12 TDS 420A TDS 430A amp TDS 460A Service Manual Operating Information c Complete the setting of the desired mode by selecting from the main menu and the side menu that results Example Push Configure 16 and then push Hardcopy Talk only 15 2 Setup a function using the general purpose knob 20 The examples of possible menu selections in the substeps that follow assume you have pushed TRIGGER MENU 19 20 SELECT Tek Run 10 0MS s S
18. 8 and 9 6 and7 1 and2 Ce A25 Low Voltage Power Supply Maximum Current 15A 3 5A 5 5A 0 75A J2 Pin 1 Figure 6 36 A25 Low Voltage Power Supply Module Right Side TDS 420A TDS 430A amp TDS 460A Service Manual 6 87 Troubleshooting This procedure helps you determine whether the A26 Monitor or the A02 Display module is bad Is the display legible but the horizontal and or vertical sync do not look ok No Power the oscilloscope off and disconnect the cable from J440 on the Yes A26 Monitor module see Figure 6 40 then power back on Is pin 1 of the cable at 15 V No On the A07 Auxiliary Power module probe J7 and J4 Is pin 1 at 15 V see Figure 6 41 No Is J7 pin 1 at 15 V see Figure 6 41 No Perform the Low Voltage Power Supply troubleshooting procedure Yes Yes Replace the cable Yes Replace the A07 Auxiliary Power module of the cable have a video Do pins 2 and 4 of J440 Yes Replace the have signals similar to Figure 6 38 No Power the oscilloscope off and disconnect the cable from J440 on the A26 Monitor module see Figure 6 40 then power back on Do pins 2 and 4 of the cable have signals similar to Figure 6 38 Yes Does pin 7 No Yes
19. Do the procedure listed at left to remove the module Do A08 Jumper Board Assembly D1 Bus and Board Supports Do not remove the A08 jumper board assembly Do in order the procedures numbered 4 6 inclusive in this table Do the procedure listed at left to remove the module 8 Fan and Fan Mount 6 63 Do the procedure listed at left to remove the module 9 A25 Low Voltage Power Supply and its Mount 6 57 Only if removing the plastic mount that secures the Low Voltage Power Supply do in order the procedures numbered 4 7 inclusive in this table Do procedure Fan and Fan Mount Do not remove the fan mount Do the procedure listed at left to remove the module 10 A07 Auxiliary Power Supply 6 67 Do the procedure listed at left to remove the module 11 Line Filter 6 65 Do the procedure listed at left to remove the module TDS 420A TDS 430A amp TDS 460A Service Manual 6 17 Removal and Installation Procedures Table 6 6 Access Instructions for Modules in Figure 6 3 Cont Procedure Including Module to be Removed 12 Back Up Batteries 13 A04 Acquisition Assembly Page No 6 53 6 69 Access Instructions 1 Dothe procedure listed at left to remove the module 1 DoAO08 Jumper Board Assembly 01 Bus and Board Supports see page 6 44 Do not remove the board supports 2 Dothe procedure listed at left to remove the module TDS 420A TDS 43
20. 080000 UP 10 5 1 174 2661 00 1 CABLE SP ELEC 18 AWG AMP TK2469 174 2661 00 2 174 2282 00 1 CA ASSY SP ELEC FLAT FLEX 15 8L TK2469 174 2282 00 3 276 0849 00 2 CORE EM EMI SUPPRESS RBN CA RECTANGLE 1JJ96 BFS 33 5X8X6 5 SLOT 27 4 253 0176 00 1 TAPE PRESS SENS VINYL 0 5 X 0 062 2 262 ORDER BY DESC 5 174 4557 00 1 ASSY SP FLAT FLEX FLX 10 26 AWG 12 0 L 1 X 10 0 1 060D9 174 4557 00 CTR RCPT LATCHING BOTH ENDS OPPOSING 5 6 174 2288 00 1 CA ASSY SP ELEC DESCETE PSC 3 5L TK2469 174 2288 00 7 174 2281 01 1 CA ASSY SP ELEC 50 28 AWG 2 3 L FLAT CABLE TK2469 ORDER BY DESC 8 174 2280 00 1 CA ASSY SP ELEC FLAT FLEX 1 7L TK2469 174 2280 00 9 174 2278 00 1 CA ASSY SP ELEC FLAT FLEX 2 5L TK2469 174 2278 00 10 174 3135 00 1 CABLE ASSY SP FLAT FLX 26 1MM 15 0L 80009 174313500 DISK DRIVE 11 174 2284 00 1 CA ASSY SP ELEC FLAT FLEX 8 8L 80009 174228400 10 14 TDS 420A TDS 430A amp TDS 460A Service Manual Figure 10 5 Cables and routing B080000 Up 10 15 TDS 420A TDS 430A amp TDS 460A Service Manual Fig amp Tektronix Serial No Mfr Index No Part No Effective Dscont Qty Name amp Description Code Mfr Part No STANDARD ACCESSORIES 1 ACCESSORY PKG 2 P6138A 1 3M PROBES 070 9701 XX 1 MANUAL TECH TUTORIAL USER ENGLISH 80009 0709701XX 020 2192 XX 1 MANUAL TECH QUICK REF 80009 0202192XX 070 9703 XX 1 MANUAL TECH SERVICE 800
21. 1120 0 01 STAUFFER SUPPLY 810 SE SHERMAN PORTLAND OR 97214 4657 TK0588 UNIVERSAL PRECISION PRODUCT 1775 NW CORNELIUS PASS RD HILLSBORO OR 97124 10 4 TDS 420A TDS 430A amp TDS 460A Service Manual Fig amp Tektronix Serial No Mfr Index No Part No Effective Dscont Qty amp Description Code Mfr Part No 10 1 1 390 1109 02 1 CABINET SCOPE ALUMINUM TEK BLUE 80009 390110902 2 367 0356 01 1 HANDLE CARRYING 80009 367035601 3 212 0144 00 2 SCREW TPG TF 8 16 X 0 562 L PLASTITE 0 01 ORDER BY DESC 4 348 0659 00 2 FOOT CABINET BLACK POLYURETHANE 0JR05 ORDER BY DESC 5 348 0764 03 1 SHLD GSKT ELEK 0 125 X 0 188 WIRE MESH 37 L 18565 ORDER BY DESC 6 334 8176 01 1 MARKER IDENT MKD REAR 07416 ORDER BY DESC 7 334 8561 00 1 MARKER IDENT OPTIONS 80009 334856100 8 161 0230 01 1 CABLE ASSY PWR 3 18 AWG 92 L SVT TAN TK2432 ORDER BY DESC STANDARD ACCESSORY 9 343 1213 00 B079999 1 CLAMP PWR CORD POLYMIDE TK1163 ORDER BY DESC STANDARD ACCESSORY 10 200 2264 00 1 CAP FUSEHOLDER 3AG FUSES 3629 FEK 031 1666 AMERICAN 200 2265 00 1 CAP FUSEHOLDER 5 X 20MM FUSES 3629 FEK 031 1663 EUROPEAN 11 159 0014 00 1 FUSE CARTRIDGE 3AG 5A 250V 0 8SEC 61857 S2 5A AMERICAN 159 0255 00 1 FUSE CARTRIDGE FAST BLOW 4A 125V 61857 EQ4A EUROPEAN 12 211 0691 00 4 SCREW MACHINE 6 32 X 0 625 PNH STL 0KB01 ORDER BY DESC 13 200 3991 02 1 COVER REAR HARD POLYCARBONATE LEXAN 80009 200399101 14 211 0730 00 1 SCR ASSEM WSHR 6 32 X 0 375 PNH ST
22. 25 GPIB IEEE 488 PORT A03 CPU 98 MONITOR ASSEMBLY 15 VIDEO DISPLAY Yah 8 nm VIDEO A26 MONITOR 7V 2A FUSED A01 BACKPLANE 2 OPTION 13 RS 232 DTE PORT 25 CENTRONICS COMPATIBLE 10 SERPAR Figure 9 6 TDS 400A Block Diagram B080000 amp Cont TDS 420A TDS 430A amp TDS 460A Service Manual 9 9 Diagrams 9 10 TDS 420A TDS 430A amp TDS 460A Service Manual Replaceable Parts This section contains a list of the replaceable modules for the instrument Use this list to identify and order replacement parts Parts Ordering Information Part Number Revision Level Replacement parts are available through your local Tektronix field office or representative Changes to Tektronix products are sometimes made to accommodate improved components as they become available and to give you the benefit of the latest improvements Therefore when ordering parts it is important to include the following information in your order Part number see Part Number Revision Level below m Instrument type or model number Instrument serial number m Instrument modification number if applicable If you order a part that has been replaced with a different or improved part your local Tektronix field office or representative will contact you concerning any change in part number Change information if any is located at the rear of this manual Tektronix part numbers contain two digit
23. 31 75 us then it is the end of field 1 see waveform R2 in Figure 4 20 Press the side menu button Press the main menu button Mode and Holdoff Then press the side menu button Holdoff Use the General Purpose knob to set the holdoff to 1 Stopped 0 Acquisitions M3 0gus 448mV 20 05 eS SISIG hess c9 x Figure 4 20 Measurement of Video Sensitivity Rotate the horizontal POSITION control clockwise to move the ends of both fields to the center of the display CHECK that a stable trigger is obtained while alternating between field 1 and field 2 If the last line is alternating between a full TV line and 2 a line in duration 63 5 us and 31 75 us respectively then triggering is occurring on both fields see waveforms R3 and R4 in Figure 4 20 d Check delay by lines Press the main menu button Scan TDS 420A TDS 430A amp TDS 460A Service Manual Performance Tests Output Signal Check Check Probe Adjust Output Press the side menu button Odd Rotate the horizontal POSITION control counter clockwise and align the trigger to center screen Press the main menu button TV Delay Mode Press the side menu button Line Use the General Purpose knob to set the line count to 10 CHECK that the selected line is the first line that has the color burst
24. 6 101 Troubleshooting Use this procedure when troubleshooting with the console Power off the oscilloscope Using the Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet disassembly procedure remove the cabinet Using the Console Port Set Up procedure connect the console port cable to J3 on the A03 CPU module Observe your terminal as you turn on the power to the oscilloscope Note the first failure or where the tests stop Is the last displayed message Acq Number of Digitizers Yes Perform the 12C Isolation troubleshooting procedure No Are the first characters of the name of the first failed diagnostic dsp Until changing a module fixes the problem replace in order the A09 DSP the A03 CPU the Yes modules No Are the first characters of the name of the first failed diagnostic dsy Until changing a module fixes the problem replace in order the Yes No Are the first Are the A02 Display and the A01 Backplane A02 Display the D1 Bus cable the A09 DSP and the A03 CPU modules No characters of the name of the first failed diagnostic cpu first characters of the name of the first failed diagnostic atBus Yes Yes Until changing a module fixes the problem replace in order the A03 CPU the A09 DSP the A02 Display and the A01 Backplane modules Until changing a module fix
25. Cross Talk Channel Isolation Delay Between Channels Full Bandwidth Equivalent Time Input Impedance DC 1 MQ Coupled Input Impedance DC 50 9 Coupled TDS 420A Input Impedance DC 50 Coupled TDS 430A and TDS 460A Input Voltage Maximum DC 1 MQ AC 1 MQ or GND Coupled Description Volts Div 1 mV div 1 99 mV div Volts Div gt 500 mV div 9 95 mV div 10 mV div 500 mV div TDS 420A TDS 430A and TDS 460A Bandwidth Bandwidth 5 mV div 10 V div DC 200 MHz DC 400 MHz 2 mV div 4 98 mV div DC 150 MHz DC 250 MHz DC 95 MHz DC 100 MHz Isolation gt 40 1 at 50 MHz for any two channels having equal volts division settings gt 40 1 at 50 MHz for any two channels having equal volts division settings gt 80 1 at 100 MHz and 30 1 at full bandwidth for any two channels having equal volts division settings x200 ps between CH 1 and CH 2 and between CH and CH 4 when both channels have equal volts division and coupling settings lt 450 ps for any other combination of two channels with equal volts division and coupling settings 1 MQ 0 596 in parallel with 15 pF 2 0 pF Matched between channels to within 1 for resistance and 1 0 pF for capacitance 50 Q 1 with VSWR lt 1 2 1 from DC 200 MHz 50 Q 1 with VSWR lt 1 6 1 from DC 400 MHz Volt Div Rating 0 1 V div 10 V div 300 V CAT Il derate at 20 dB decade above 10 MHz until the minimum rating of 5 V DC peak AC i
26. Earthing Green Table 2 2 Power Cord Identification Plug Configuration Normal Usage Option Number North America Standard 125V Europe 1 230 V United Kingdom A2 230 V Australia A3 230 V North America A4 230 V Switzerland 5 230 V The line voltage ranges and their associated line frequency ranges over which this oscilloscope operates are listed in Chapter 1 Specification See Source Voltage and Frequency on page NO TAG for those ranges TDS 420A TDS 430A amp TDS 460A Service Manual Installation A Memory Backup Power CAUTION Before stepping the source line voltage from one range to a higher range set the principal power switch rear panel to its OFF position Failure to do so can damage the oscilloscope There are two fuses Either fuse may be used throughout the line voltage and frequency ranges These two fuses are not totally interchangeable as each requires a different fuse cap The fuses and their caps are listed by part number in Chapter 10 Mechanical Parts List Replaceable lithium batteries maintain internal memory modules to allow the digitizing oscilloscope to retain the following data upon loss of the AC power source stored adjustment constants saved front panel settings current front pa nel settings oscilloscope status and saved waveforms These batteries have a shelf life of about five years Partial or total loss of stored settings upon powering on may indica
27. Initial Test Hookup 5 16 Figure 5 8 Probe Test Hookup 5 18 Figure 5 9 Locations of Probe Adjustments 5 19 Figure 5 10 Adjustments vs Front Corner Response 5 20 Figure 5 11 Monitor Adjustment Locations 5 23 Figure 5 12 Five and Ten Percent Luminance Patches 5 24 Figure 5 13 Composite Pattern for Focusing 5 25 Figure 6 1 Oscilloscope 6 11 Figure 6 2 Cabinet and Front Panel Mounted Modules 6 16 Figure 6 3 Internal Modules 6 19 Figure 6 4 Cables and cable routing B010100 B079999 6 22 Figure 6 5 Cables and cable routing B080000 amp up 6 23 Figure 6 6 Knob and shaft removal 6 25 Figure 6 7 Line fuse and line cord removal 6 26 Figure 6 8 Front cover rear cover cabinet emi gasket and cabinet handle and feet 1 6 28 Figure 6 9 Trim ring menu elastomer and menu buttons 1 6 31 Figure 6 10 EMI gasket removal and installation 6 33 Figure 6 11 Disk drive removal 6 34 Figure 6 12 A06 Front Panel assembly ESD shield and menu flex and probe code flex circuits removal 6 36 Figure 6 13 Disassembly
28. Item 11 One precision 50 Q coaxial cable Item 5 One 10X attenuator Item 1 One 5X attenuator Item 2 Prerequisites See page 4 15 l Install the test hookup and preset the oscilloscope controls a Initialize the oscilloscope Press save recall SETUP Press the main menu button Recall Factory Setup Press the side menu button OK Confirm Factory Init 4 40 TDS 420A TDS 430A amp TDS 460A Service Manual Performance Tests b Modify the initialized front panel control settings m Setthe horizontal SCALE for the M main time base to 20 ns m Press HORIZONTAL MENU then press the main menu button Time Base Press the side menu button Delayed Only then press the side menu button Delayed Triggerable m Setthe horizontal SCALE for the D delayed time base to 20 ns then press the side menu button Main Only m Press TRIGGER MENU then press the main menu button Mode amp Holdoff Now press the side menu button Normal m Press VERTICAL MENU then press the main menu button Coupling Now press the side menu button Q to select the 50 Q setting Press SHIFT then press ACQUIRE MENU Now press the main menu button Mode then press the side menu button Average 16 c Hook up the test signal source Connect through a 50 Q precision coaxial cable the signal output of a sine wave generator to CH 1 see Figure 4 13 Sine Wave Digitizing Oscilloscope Generator Fig
29. The procedures called out in the substeps that follow reinstall all the modules When doing these procedures do their steps in reverse order When reinstalling the modules ignore any instructions that require connect ing a cable or bus to a module that you have not yet installed You will make the necessary connections when you install the missing module later Ignore any instructions to do the Access Procedure The access procedure is only used when removing individual modules for servicing not when doing a disassembly reassembly for cleaning Ignore any instructions directing you to see other procedures to reinstall modules removed by the access procedure The substeps that follow direct you to the procedures needed to reinstall all of the modules a A04 Acquisition Assembly page 6 69 b A05 Attenuator Assembly and Shield page 6 39 c Back up Batteries page 6 53 d A01 Backplane Assembly and its Mount page 6 50 e A09 DSP Assembly page 6 48 f A02 Display Assembly page 6 47 g A03 CPU Assembly page 6 45 h Line Fuse and Line Cord page 6 26 i A08 Jumper Board Assembly D1 Bus and Board Supports page 6 44 j Line Filter page 6 65 TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures k A07 Auxiliary Power Supply B010100 B079999 page 6 67 1 A26 Monitor Assembly page 6 41 m A25 Low Voltage Power Supply and its Mount page 6 57 n Fan Fan Mount page
30. amp TDS 460A Service Manual Adjustment Procedures b Make the focus adjustment Locate R411 FOCUS see Figure 5 11 m Adjust 411 for best overall focusing at all four corners and at the center of the screen see Figure 5 13 Corner Center Corner Corner Corner Figure 5 13 Composite Pattern for Focusing 6 Restore the oscilloscope to normal operation a Restore the dip switch to the settings that follow Switch No 1 2 3 4 5 6 7 8 Open Closed X X X X X X X X TDS 420A TDS 430A amp TDS 460A Service Manual 5 25 Adjustment Procedures b Power off the oscilloscope c Seethe Removal and Installation Procedures starting on page 6 9 to reinstall the cabinet and other modules removed in step 1 5 26 TDS 420A TDS 430A amp TDS 460A Service Manual Maintenance This chapter contains the information needed to do periodic and corrective maintenance on the TDS 420A TDS 430A amp TDS 460A Digitizing Oscillo scopes Specifically the following sections are included Preparation General information on preventing damage to internal modules when doing maintenance Inspection and Cleaning Information and procedures for inspecting the oscilloscope and cleaning its external and internal modules Removal and Installation Procedures Procedures for the removal of defective modules and replacement of new or repaired modules Also included is a procedure for dis
31. connectors 012 0482 00 9 Coupler Dual Input BNC female to dual male BNC Tektronix part number Software based adjustments 067 0525 02 10 Connector Dual Banana BNC female to dual banana Tektronix part number Software based adjustments 103 0090 00 11 Generator DC Calibration Variable amplitude to 10 V Wavetek 9100 or optionally Software based adjustments accuracy to 0 0596 Data Precision 8200 12 Probe 10X included with A P6138A Probe Tektronix P6138A Signal interconnection this instrument 13 Generator Leveled Sine Wave medium frequency 200 kHz to 250 MHz Variable amplitude from 5 mV to 4 Vp p into 50 flatness lt 3 96 harmonic content 214 harmonic down 30 dB from fundamental all others down 40 dB Rohde amp Schwarz SMY Sine Wave Generator Rohde amp Schwarz URV 35 Level Meter with NRV Z8 Power Sensor and RVZ Power Splitter or optionally TEKTRONIX SG 503 5050302 Leveled Sine Wave Generator Software based adjustments TDS 420A TDS 430A amp TDS 460A Service Manual 5 5 Adjustment Procedures Table 5 3 Test Equipment Fixtures and Supplies Cont Item Number and Description 14 5 6 Generator Pulse Photometer Generator Leveled Sine Wave high frequency 250 MHz to 500 MHz Variable amplitude from 5 mV to 4 Vp p into 50 2 harmonic content 2nd harmonic down 30 dB from fundamental all others down 40 dB High amplitude
32. page 6 27 to reinstall the cabinet and rear cover m Line Fuse and Line Cord page 6 26 to reinstall the line cord which completes the oscilloscope reassembly Spudger EMI Gaskets 4 Pd Figure 6 10 EMI gasket removal and installation TDS 420A TDS 430A amp TDS 460A Service Manual 6 33 Removal and Installation Procedures Disk drive For this procedure you will need a screwdriver with a size T 15 Torx tip items 1 and 2 and a Pozidriv screwdriver item 6 1 If you have not already performed the Access Procedure on page 6 13 and removed the modules as instructed do so now 2 Setthe oscilloscope so its bottom is down and its front is facing you Remove T 15 Torx drive screw see text Remove securing screw see text Figure 6 11 Disk drive removal 3 remove the disk drive perform the following steps using Figure 6 11 as a guide a Liftup on the two locking tabs on J1 of the disk drive b Remove the cable from the drive c Ifpresent remove the 15 Torx drive screw that clamps the drive in the chassis When replacing the drive do not reinstall this screw d Remove the one or two screws securing the drive to the chassis e Grasp the drive by its front edges and pull it out of the front panel to complete its removal 6 34 TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures
33. triggered on the selected slope positive or negative This display should not have its trigger point switching between opposite slopes nor should it roll across the screen At horizontal scale settings appropriate for viewing video waveforms the TRIG D light remains constantly lit Press TRIGGER MENU Press the main menu button Type twice first to pop up its menu and then to toggle it to Video W Press the main menu button Class to pop up its menu Press it again as needed to toggle it to NTSC W Press the main menu button Scan to pop up its menu W Press the side menu button Odd Center the display at mid screen m CHECK that a stable trigger is obtained with the last two lines of TV field 2 and the beginning of TV field 1 displayed If the last line is a full TV line duration 63 5 us then it is the end of field 2 see waveform R1 in Figure 4 20 Press the side menu button Even Center the display at mid screen TDS 420A TDS 430A amp TDS 460A Service Manual 4 51 Performance Tests R1 waveform Note that two full lines start the display R2 waveform Note that 11 2 lines start the display R3 and R4 waveforms Note that with non interlaced both fields scan mode gt CH 1 switches between the and R4 displays 4 52 CHECK that a stable trigger is obtained with the last of TV field 1 and the beginning of TV field 2 displayed If the last line is TV line duration
34. 0 to 100 typically covers a range of 1 to 400 ms Triggerable on Field Selections Odd Even or Both Delayed Acquisition Settable for delay by line number or runs after time delay Frequency Maximum for Events Delay 90 MHz TDS 420A TDS 430A amp TDS 460A Service Manual 1 25 Typical Characteristics Table 1 19 Typical Characteristics Triggering System Cont Name Width Minimum Pulse and Rearm Events Delay Description 5ns The trigger position errors are typically less than the values given here These values are for triggering signals having a slew rate at the trigger point of 0 5 division ns The waveform interval WI is the time between the samples in the waveform record Also see the footnote for the characteristics Sample Rate Range and Equivalent Time or Interpolated Waveform Rates in Table 1 4 on page 1 9 The minimum sensitivity for obtaining a stable trigger A stable trigger results in a uniform regular display triggered on the selected slope The trigger point must not switch between opposite slopes on the waveform and the display must not roll across the screen on successive acquisitions The TRIG D LED stays constantly lighted when the SEC DIV setting is 2 ms or faster but may flash when the SEC DIV setting is 10 ms or slower See the characteristic Sensitivity Edge Type Trigger DC Coupled in Table 1 12 which begins on page 1 18 The maximum frequency for a delaying events
35. 00779 87 3334 017 13 407 4032 00 2 BRACKET CKT BD 80009 407403200 14 211 0722 00 4 SCREW MACHINE 6 32 X 0 25 PNH STL 0 01 ORDER BY DESC 15 671 3268 01 1 CIRCUIT BD ASSY CPU 80009 671326801 16 671 3902 00 1 CIRCUIT BD ASSY DISPLAY 80009 671390200 17 671 3588 00 1 CIRCUIT BD ASSY DSP 80009 671358800 STANDARD 671 3284 00 1 CIRCUIT BD ASSY DSP 80009 671328400 OPTION 1M 18 386 6158 00 3 SUPPORT CKT BD MAT MATERIAL 80009 386615800 19 146 0056 02 2 BATTERY 3V 1200MAH 2 3A LITHIUM BATTERY ODWW6 ORDER BY DESC 20 671 3597 01 1 CIRCUIT BD ASSY ACQUISITION 80009 671359701 TDS420A ONLY 671 1685 12 1 CIRCUIT BD ASSY ACQUISITION 80009 671168512 TDS460A ONLY 671 3980 00 1 CIRCUIT BD ASSY ACQUISITION 80009 671398000 TDS430A ONLY 21 344 0116 00 2 RTNR CAPACITOR 0 625 DIA STEEL TK1891 50003 007 22 671 1683 00 1 CIRCUIT BD ASSY JUMPER 80009 671168300 23 671 3595 01 1 CIRCUIT BD ASSY ATTENUATOR 80009 671359501 TDS420A ONLY 671 1686 07 1 CIRCUIT BD ASSY ATTENUATOR 80009 671168607 TDS460A ONLY 671 3979 00 1 CIRCUIT BD ASSY ATTENUATOR 80009 671397900 TDS430A ONLY 24 337 3713 01 12 SHIELD ELEC ATTENUATOR TK1935 337371301 25 671 1676 03 1 CIRCUIT BD ASSY BACKPLANE 80009 671167605 26 200 3660 00 1 COVER AUTO CAL POLYCARBONATE TK1163 ORDER BY DESC 27 441 2072 01 1 CHASSIS ASSY ALUMINUM 80009 441207200 10 8 TDS 420A TDS 430A amp TDS 460A Service Manual Figure 10 2 Internal modules B010
36. 4 34 Figure 4 11 Measurement of Accuracy Long Term and Delay Dimes 552 56 5 ese SG en ew ees 4 37 Figure 4 12 Initial Test Hookup 4 38 Figure 4 13 Initial Test Hookup 4 41 Figure 4 14 Measurement of Trigger Sensitivity 4 43 Figure 4 15 Initial Test Hookup 4 45 Figure 4 16 Confirming Auxiliary Triggering at Maximum Triggering Frequency 4 46 Figure 4 18 Initial Test Hookup 4 49 Figure 4 19 Adjusting Sync Pulse Amplitude 4 51 Figure 4 20 Measurement of Video Sensitivity 4 52 Figure 4 21 Initial Test Hookup 4 54 Figure 4 22 Measurement of Probe Compensator Limits 4 55 Figure 4 23 Sine Wave Generator Leveling Equipment Setup 4 56 Figure 4 24 Equipment Setup for maximum Amplitude 4 57 Figure 5 1 Hookup for Probe Compensation 5 10 Figure 5 2 Performing Probe Compensation 5 11 Figure 5 3 Proper and Improper Probe Compensation 5 12 Figure 5 4 Exposing the Inner Probe Tip 5 13 Figure 5 5 Initial Test Hookup 5 13 Figure 5 6 Exposing the Probe Body 5 16 TDS 420A TDS 430A amp TDS 460A Service Manual iil Table of Contents Figure 5 7
37. 430A amp TDS 460A Service Manual 6 5 Maintenance 6 6 Table 6 3 Internal Inspection Check List Item Circuit boards Resistors Solder connections Capacitors Semiconductors Wiring and cables Chassis Inspect For Loose broken or corroded solder connections Burned circuit boards Burned broken or cracked circuit run plating Burned cracked broken blis tered condition Cold solder or rosin joints Damaged or leaking cases Corroded solder on leads or terminals Loosely inserted in sockets Distorted pins Loose plugs or connectors Burned broken or frayed wiring Dents deformations Repair Action Remove failed module and replace with a fresh module Remove the module with the faulty resistor and replace it with a fresh module Resolder joint and clean with isopropyl alcohol Remove the module with the faulty capacitor and replace it with a fresh module from the factory Firmly seat loose semiconduc tors Remove devices that have distorted pins Carefully straight en pins as required to fit the socket using long nose pliers and reinsert firmly Ensure that straightening action does not crack pins causing them to break off Firmly seat connectors Repair or replace modules with defective wires or cables Straighten repair or replace chassis Cleaning Procedure Interior Use the following procedure to clean the interior of the oscillo
38. 460A Service Manual T 3 Options and Accessories Table 7 4 Compatible Probes Cont Probe Type Passive low impedance Zo Passive high voltage Active high speed voltage Active differential voltage Current Logic Word Trigger Optical Opto Electric Converters 7 4 Tektronix Model P6156 P5100 P6015A P6243 P6204 P6046 P5205 AM 503S AM 5035 Opt 03 AM 5035 Opt 05 TCP202 P6021 P6022 CT 1 CT 2 CT 4 P6408 P6701A P6703A P6711 P6713 Description 10X 3 5 GHz for 50 2 inputs 1X 20X 100X optional 100X 2 5 kV DC peak AC 1000X 20 kV DC peak AC DC to 1 GHz FET TekProbe powered DC to 1 GHz FET DC Offset capability requires Tektronix 1103 TekProbe Power Supply for offset capability 1X 10X 250 V DC to 100 MHz 50X 500X 1300 V DC to 100 MHz AC DC Uses DC to 50 MHz 6302 Current Probe AC DC Uses DC to 15 MHz 6303 Current Probe AC DC Uses DC to 100 MHz 6312 Current Probe DC to 50 MHz TekProbe powered AC 120 Hz to 60 MHz AC 935 kHz to 120 MHz Designed for permanent or semi permanent in circuit installation CT 1 25 kHz to 1 GHz 50 Q input CT 2 1 2 kHz to 200 MHz 50 Q input Current Transformer for use with AM 5035 and P6021 Peak pulse 1 kA 0 5 Hz to 20 MHz with AM 5035 16 channel one qualifier channel TTL compatible 45 V power supply required 500 to 950 nm DC to 850 MHz 1 V mW 1100 to 1700 nm DC to 1 GHz 1 V mW 500
39. A Inspection and Cleaning describes how to inspect for dirt and damage on and how to clean the exterior and interior of the TDS 420A TDS 430A amp TDS 460A Digitizing Oscilloscopes Inspection and cleaning are done as preventive maintenance Preventive maintenance when done regularly may prevent oscilloscope malfunction and enhance its reliability Preventive maintenance consists of visually inspecting and cleaning the oscilloscope and using general care when operating it How often to do maintenance depends on the severity of the environment in which the oscilloscope is used A proper time to perform preventive maintenance is just before oscilloscope adjustment The cabinet helps keep dust out of the oscilloscope and it is a major component of the oscilloscope cooling system The cabinet should normally be in place when operating the oscilloscope The front cover protects the front panel and display from dust and damage Install the front cover when storing or transport ing the oscilloscope Inspect and clean the oscilloscope as often as operating conditions require The collection of dirt on components inside can cause them to overheat and break down Dirt acts as an insulating blanket preventing efficient heat dissipation Dirt also provides an electrical conduction path that could cause an oscilloscope failure especially under high humidity conditions CAUTION Avoid the use of chemical cleaning agents which might damage
40. CH 1 Connect the probe tip to PROBE ADJ on the front panel leave the probe ground unconnected b Initialize the oscilloscope Press save recall SETUP Press the main menu button Recall Factory Setup Press the side menu button OK Confirm Factory Init c Modify the initialized front panel control settings W Press AUTOSET Set the horizontal SCALE to 200 us m Press SET LEVEL TO 50 TDS 420A TDS 430A amp TDS 460A Service Manual Adjustment Procedures W Press VERTICAL MENU m Push the main menu button Bandwidth Then push the side menu button 20 MHz m Press SHIFT Then press ACQUIRE MENU Press the main menu button Mode Then press the side menu button Hi Res 2 Compensate the Probe a Locate the probe compensation hole in the side of the probe body see Figure 5 2 b Using the probe compensation tool adjust the probe for best square wave compensation flat as possible across the top of the waveform See Figure 5 3 Figure 5 2 Performing Probe Compensation TDS 420A TDS 430A amp TDS 460A Service Manual 5 11 Adjustment Procedures Probe Compensated Correctly Probe Overcompensated Probe Undercompensated Figure 5 3 Proper and Improper Probe Compensation 3 Disconnect the hookup Disconnect the probe from the probe adj adjust terminals leave the probe installed on CH 1 and leave the oscilloscope control setup as is for doing the next part of the probe adju
41. Figure 6 12 on page 6 36 m DO NOT touch the contacts on the menu flex circuit with your bare fingers You should wear clean cloth gloves that are free of lint when installing the menu flex circuit on the front chassis m Wipe the front of the chassis using isopropyl alcohol and a clean lint free cloth Let the chassis dry Some adhesive from the flex circuit you removed will be left on the front of the chassis This is normal m Find the score line in the adhesive backing and peel the backing off of the menu flex circuit m Carefully align the three holes on the menu flex circuit to the locator studs on the front of the main chassis When the alignment is correct press the flex circuit against the chassis so it adheres to the chassis Clean the surface of the menu flex circuit just installed using isopropyl alcohol and a clean lint free cloth See step 6 to install the probe code flex circuit if it was removed See step 5 to install the ESD shield if it was removed If the front panel assembly was disassembled for cleaning in step 7 apply a thin coating of bearing grease Dow Corning 1292 to the two switch patterns circular patterns for the vertical scale rotary switches on the circuit board Then reverse substeps 7a 7d to reassemble using Figure 6 13 as a guide Do in reverse order substeps 4a through 4d reversing the procedure outlined in each step Be sure to dress the CPU to front panel cable so that the loop of
42. Manual 5 7 Adjustment Procedures 5 8 Software Based Adjustments 2 Install the software to hard disk d Install your working disk in a floppy drive and switch to that drive Use the appropriate commands to display the file called README Read this file before continuing with this procedure Type install Install asks you to specify the hard disk on which to install the adjustment software It also prompts you to specify several GPIB card configuration parameters The adjustment software is installed a directory called TDS400A ADJ 3 Store your installation disk Remove your installation disk and store it in a secure place Equipment All items that are listed for Software based adjustments under Required Purpose in Table 5 3 starting on page 5 5 1 Hook the oscilloscope a Connect the GPIB cable Item 7 to the GPIB port at the computer rear panel When multiple GPIB cards are installed connect to the GPIBO card Connect the GPIB cable Item 7 to the GPIB port at the oscilloscope rear panel Power on the oscilloscope 2 Setup the oscilloscope a b c d Press SHIFT then press UTILITY Repeatedly press the main menu button System until I O is highlighted in the pop up menu Press the side menu button TALK LISTEN Use the General Purpose knob to set any address between 0 and 29 3 Let the oscilloscope warm up Allow a 20 minute warm up period before yo
43. OK Confirm Factory Init b Hook up the test signal source m Set the Vertical SCALE to 1 Volt per division Connect the output of a function generator through a 50 precision coaxial cable and a 50 terminator to the CH 1 input m Set the output of the function generator for a 5 MHz 0 to 4 Volt 4 division square wave at the oscilloscope input m Move the setup from the CH 1 input to the AUX TRIGGER EXT CLOCK input on the rear panel of the oscilloscope see Figure 4 17 Sine Wave Digitizing Oscilloscope To Rear Panel Function Generator Generator Output Figure 4 17 Initial Test Hookup TDS 420A TDS 430A amp TDS 460A Service Manual 4 47 Performance Tests 4 48 Connect the output of the sine wave generator through an N to BNC adaptor and a 50 2 precision coaxial cable to the CH 1 input of the oscilloscope Set the Vertical SCALE to 100 mV Press VERTICAL MENU then press the Coupling main menu button Set the coupling to 50 O Set the output of the sine wave generator for a 100 KHz 4 division sine wave Modify the default settings Press HORIZONTAL MENU then press the Clock main menu button Press the side menu button External Set the Max Ext Clock Rate to 10 0 MHz Press CLEAR MENU Check external clock CHECK that the displayed sine wave has a one division period Slowly adjust the frequency of the function generator to 10 MHz while watching the display CHECK
44. Output Sense DC Calibrator Dual Banana to pu BNC Adapters BNCT Connector 50 Q Coaxial Cables Figure 4 4 Initial Test Hookup 4 20 TDS 420A TDS 430A amp TDS 460A Service Manual Performance Tests b Initialize the oscilloscope Press save recall SETUP Press the main menu button Recall Factory Setup Press the side menu button OK Confirm Factory Init c Modify the default settings Set the horizontal SCALE to 1 ms Press SHIFT then ACQUIRE MENU Press the main menu button Mode then press the side menu button Hi Res Press DISPLAY Press the main menu button Graticule then press the side menu button Frame Press MEASURE Press the main menu button Select Measurement for CHx then press the side menu button Mean You will have to press MORE several times to access the Mean measurement Press CLEAR MENU 2 Confirm input channels are within limits for offset accuracy Do the following substeps test CH 1 first skipping substep a since CH 1 is already set up to be checked from step 1 other procedure in this manual read the Safety Summary found at the beginning WARNING High voltages are used in this procedure Before doing this or of this manual a Select an unchecked channel Press WAVEFORM OFF to remove the channel just confirmed from the display Then press the front panel button that corresponds to the
45. Perform in reverse order substeps 4a 4c reversing the removal instruc tions in each substep to reinstall the assembly See the following procedures in the order listed to replace modules removed by the access procedure m A08 Jumper Board Assembly D1 Bus and Board Supports on page 6 44 to install the jumper board and D1 bus only Wm Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet page 6 27 to reinstall the cabinet and rear cover m Line Fuse and Line Cord page 6 26 to reinstall the line cord which completes the oscilloscope reassembly TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures Main Chassis 1 Remove the main chassis Since the removal of the main chassis requires the removal of virtually all modules perform the procedure Disassembly for Cleaning that follows 2 Reinstallation See reinstallation instructions in Disassembly for Cleaning Disassembly for Cleaning This procedure is for disassembly of the digitizing oscilloscope into its individu al modules so they can be cleaned Read the cleaning instructions in Inspection and Cleaning on page 6 4 before disassembling this oscilloscope 1 Assemble equipment and locate modules to be removed a Have handy a screwdriver with a size T 15 Torx tip Items 1 and 2 a 1 20 Torx tip Item 3 a flat bladed screwdriver Item 5 a pair of angle tip tweezers Item 10 duck bill pliers Item 8 fl
46. Technician Performance Test Minimum Incoming Outgoing Maximum Trigger System DC Coupled Threshold Main Trigger 18 mV 18 mV Main Trigger Falling 18 mV 18 mV Main Trigger 18 mV 18 mV Delayed Trigger Falling 18 mV 18 mV Auxiliary Trigger 10 MHz External Clock 10 MHz Probe Compensator Output Signal Frequency 950 Hz 1050 Hz Voltage 475 mV 525 mV TDS 420A TDS 430A amp TDS 460A Service Manual 4 19 Performance Tests Signal Acquisition System Checks These procedures check those characteristics that relate to the signal acquisition system and are listed as checked under Warranted Characteristics in Chapter 1 Specification Check Offset Accuracy Equipment Two dual banana connectors Item 7 Required One BNC T connector Item 8 One DC calibration generator Item 10 Two precision coaxial cables Item 5 Prerequisites See page 4 15 1 Install the test hookup and preset the instrument controls a Hook up the test signal source m Set the output of a DC calibration generator to 0 volts Connect the output of a DC calibration generator through dual banana connector followed by a 50 precision coaxial cable to one side of a BNC T connector see Figure 4 4 Connect the Sense output of the generator through a second dual banana connector followed by 50 Q precision coaxial cable to the other side of the BNC T connector Now connect the BNC T connector to CH 1 Digitizing Oscilloscope
47. amp TDS 460A Service Manual 1 17 Warranted Characteristics Table 1 12 Warranted Characteristics Triggering System Name Description Accuracy Trigger Level or Threshold 2 of Setting Net Offset 0 2 div x volts div setting Offset Accuracy for any DC Coupled Sensitivity Edge Type Trigger DC Coupled Sensitivity Video Type TV Field and TV Line Pulse Width minimum Events Delay Auxiliary Trigger Input External Clock Input Auxiliary Trigger Maximum Input Frequency Frequency External Clock channel as trigger source and for signals having rise and fall times gt 20 ns 0 35 division from DC to 50 MHz increasing to 1 division at 350 MHz TDS 4204 or 500 MHz TDS 430A and TDS 460A for any channel as trigger source 0 6 division of video sync signal 5 ns Connector BNC at rear panel Input Load equivalent to three TTL gate loads Input Voltage maximum 5 VDC to 10 VDC TTL levels recommended 10 MHz Duty Cycle DC to 10 MHz High and low levels must be stable for gt 50 ns High and low levels must be stable for gt 50 ns 1 NetOffset Offset Position x Volts Div Net Offset is the voltage level at the center of the A D converter dynamic range Offset Accuracy is the accuracy of this voltage level The minimum sensitivity for obtaining a stable trigger A stable trigger results in a uniform regular display triggered on the selected slope The trigger point must not s
48. board is ok square waves Using the A08 Jumper Board Assembly D1 Bus and Board Supports removal Perform the Low Voltage Power procedure see page 6 44 remove the A08 Jumper board Are the CH1 Trigger CH1 Vertical and CH1 Vertical inverted Perform the 12C signals on J102 pins 26 27 and 28 troubleshooting of the A05 Attenuator board about procedure 100 mV 1 kHz square waves Replace the A04 Acquisition board or the A08 Jumper board Are the signals Perform the 12C not visible at troubleshooting all procedure Replace the A05 Attenuator board Repeat this procedure for each input channel Before removing the A08 Jumper board were the signals double the amplitude and are they still double the amplitude Yes Replace the A04 Acquisition board or the A08 Jumper board Figure 6 45 Attenuator Acquisition Troubleshooting Procedure 6 94 TDS 420A TDS 430A amp TDS 460A Service Manual Troubleshooting Vertical Signals A C i CH3SIGN CH2SIGP CHS3SIGP CH2SIGN CH4SIGN CH1SIGP CH4SIGP CH1SIGN r P1 Pin 1 J102 on A05 Attenuator smp
49. cable 6 20 TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures Table 6 7 Access and Removal Instructions for Cables in Figure 6 4 Cont Name of Cable Access and Removal Instructions 6 X Aux Supply to Low Voltage Power Supply to 1 If removing the aux supply to low voltage power supply to ground lug Ground Lug cable unplug the cable from the low voltage power assembly Also Line Filter to Ground Lug unsolder the cable wires from the auxiliary power supply assembly 2 Ifremoving the line filter to ground lug cable unplug it from the line filter lug See Figure 6 4 3 Using a g inch nut driver Item 9 remove the nut s that secure the cable to be removed from the lug and remove it 4 Reverse these instructions to install the replacement cable 7 Monitor 1 Findthe procedure A02 Display Assembly in Table 6 6 2 Follow the access instructions found there to access and remove the display assembly The cable is unplugged from that assembly in the process 3 Unplug the cable from the monitor See Figure 6 4 for jack location 4 Unplug the cable from the auxiliary power supply See Figure 6 4 for jack location 5 Reverse these instructions to install the replacement cable TDS 420A TDS 430A amp TDS 460A Service Manual 6 21 Removal and Installation Procedures Line Filter to amp so eS gt 2s 2a 5 AD xS Sis lt gt Ground Lug RM
50. characteristics apply when the oscilloscope is adjusted at an ambient temperature between 20 C and 30 C has had a warm up period of at least 20 minutes and is operating at an ambient temperature between 0 C and 50 C unless otherwise noted Table 1 10 Warranted Characteristics Signal Acquisition System Name Accuracy DC Voltage Mea surement Averaged Description Measurement Type DC Accuracy Average of 216 waveforms 1 5 x reading Net Offset Offset Accuracy 0 06 div x Vertical Scale Delta volts between any two averages of 216 waveforms 1 5 x reading 0 3 mV 0 1 div x Vertical Scale Accuracy DC Gain 1 5 Accuracy Offset Volts Div Setting Offset Accuracy 1 mV div 9 95 mV div 0 4 x Net Offset 0 9 mV 0 1 div x Vertical Scale 10 mV div 99 5 mV div 0 4 x Net Offset 1 5 mV 0 1 div x Vertical Scale 100 mV div 995 mV div 0 4 x Net Offset 15 mV 0 1 div x Vertical Scale 1 V div 10 V div 0 4 x Net Offset 150 mV 0 1 div x Vertical Scale Accuracy Position 1 596 x Position x Volts div Offset Accuracy 0 04 div TDS 420A TDS 430A amp TDS 460A Service Manual 1 15 Warranted Characteristics Table 1 10 Warranted Characteristics Signal Acquisition System Cont Name Analog Bandwidth DC 50 O Coupled to BNC and Band width Selection is Full
51. digitizing oscilloscope Set the digitizing oscilloscope so its left side is down with its front facing to the left of you 4 Remove the DSP Assembly Use Figure 6 19 as a guide perform the following substeps a Unplug the battery backup cable at J5 b Remove the single T 15 Torx 9 screw from the bracket that secures the display assembly at the inside rear corner of the main chassis c Remove the single T 15 Torx 9 screw from the bracket that secures the DSP assembly at the inside rear corner of the main chassis 6 48 TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures d Working from the rear of the oscilloscope remove the single T 15 Torx screw from the bracket that secures the DSP assembly to the rear of the main chassis Mounting Screw short DSP Assembly Mounting Screw Display Assembly Mounting 7 Screw DSP Assembly D1 Bus Removed lt by the Access procedure A09 DSP Assembly Figure 6 19 A09 DSP assembly removal e Grasp the board by its edge and pull outward to unplug it from J5 of the backplane assembly to complete the removal 5 Reinstallation a Perform in reverse order substeps 4a 4e reversing the removal instruc tions in each substep to reinstall the assembly b Seethe following procedures in the order listed to replace modules removed by the access procedure m A08 Jumper Board Assembly D1 Bus and Boa
52. events In such a case the events source is the delayed trigger source For any events signal the delayed trigger system conditions the signal by determining the source coupling and other things of that signal At time base settings of 20 ms per division or slower the records are displayable using Roll mode Both untriggered roll and triggered roll modes are available The triggering system comprises a complete set of features for triggering the signal acquisition system In edge trigger mode you can select the source slope coupling mode auto or normal and holdoff Oscilloscopes ordered with Option 5 also have the video trigger mode This trigger mode allows triggering on NTSC standard PAL standard SECAM stan dard and custom video waveforms You can configure the triggering for interlaced or non interlaced scanning different scan rates field selection line selection and for delay by line or time You can choose where the trigger point is located within the acquired waveform record by selecting the amount of pretrigger data displayed You can select presets of 10 5096 and 90 of pretrigger data in the horizontal menu or you can assign the General Purpose knob to set pretrigger data to any value within the limits of trigger position resolution Depending on your measurement requirements you can specify the mode and manner in which signals are acquired and processed W Youcan select equivalent time sampling on repetitive
53. if setting a vertical function else skip to step b Example Push CH 2 Push SHIFT 4 if the function to be set is highlighted in blue else skip to step c Tek Run 10 0MS s Sample Impedance KEEN 50 ich 1 00 8 i M5 0045 Chi 820mV 2 Bandwidth Fine Scale Position emer 13 0 0 0 0 0 0 Push the front panel button that corresponds to the menu containing the function A main menu 14 for selecting among related functions appears Example Push VERTICAL MENU Note the two labels the top label is a function to choose from the bottom label tells you the current setting for that function Offset is currently set to 1 4 V Select a function from the main menu using the main menu buttons 12 A side menu for selecting among the available settings for that function appears Example Push Coupling 13 TDS 420A TDS 430A amp TDS 460A Service Manual 2 11 Operating Information e Select the setting for the function from the side menu 9 using the side menu buttons 11 Example Push AC 10 How to Set Complex few functions require more than just two levels main and side of menus to Functions completely specify their settings In such cases either the main menu the side menu or both are modified to supply additional choices The procedures that follow show both schemes
54. listed starting on page 1 15 You can also use this procedure to optimize the performance of the oscilloscope This procedure is required to verify the oscilloscope conforms with its warranted characteristics performance verification procedures are found in the Performance Verification starting on page NO TAG As a general rule these adjustments should be done every 2 000 hours of operation or once a year if used infrequently Requirements for Performance Personnel Warm up Period Access Before you do this procedure you need to address the following requirements Only trained service technicians should perform these procedures This oscilloscope requires a 20 minute warm up period in a 20 C to 30 C environment before it is adjusted Adjustments done before the operating temperature has stabilized may cause errors in performance Except when adjusting the monitor assembly the cabinet is not removed A monitor adjustment is not done as part of a routine adjustment see Complete Adjustment on page 5 2 TDS 420A TDS 430A amp TDS 460A Service Manual 5 1 Adjustment Procedures System Optional Peripherals Test Equipment Usage Performing the Adjustments Complete Adjustment 5 2 The following computer and peripherals are required to adjust this oscilloscope the adjustment software does not run on systems that do not meet require ments listed An IBM PC compatible computer equipped as f
55. removal 5 Remove the ESD shield If replacing this shield note how the small cutout on the shield is aligned to the snap lock at the lower left corner of the assembly and reference for later replacement Then pull the ESD shield off the left edge of the front panel to remove The shield snaps on and off TDS 420A TDS 430A amp TDS 460A Service Manual 6 35 Removal and Installation Procedures Menu Flex 2 Circuit ESD Shield ae d Front Panel Assembly y Probe Code 2 Flex Circuit X TN Press To Release a Snap Lock 2 Figure 6 12 A06 Front Panel assembly ESD shield and menu flex and probe code flex circuits removal 6 Remove the Probe Code Flex Circuit If replacing or cleaning the probe code flex circuit remove the four T 15 Torx screws and lift the probe code flex circuit away from the front of the main chassis STOP Perform step 7 only if disassembling for cleaning and lubrication Components removed in step 7 are not field replaceable Otherwise skip to step 8 to continue this procedure 7 Further disassembly of front panel assembly If the front panel or the front panel buttons are to be serviced do the following substeps a Remove the front panel control knobs from the front panel assembly using the method described in Front Panel Knobs and Shafts on page 6 23 b Release the five snap locks at the edge and center
56. signal e Check sync trigger Using the Vertical POSITION knob move the video waveform from the top to the bottom of the display CHECK that the TRIG D LED stays on and the waveform is stable Using the Vertical POSITION knob return the waveform to the center of the display 3 Disconnect the hookup Disconnect the cable from the generator output at the input connector of CH 1 The procedure that follows checks the characteristics of the probe compensation signal that are listed as checked under Warranted Characteristics in Chapter 1 Specification Equipment One standard accessory 10X probe Item 17 Required Prerequisites See page 4 15 Also this digitizing oscilloscope must have passed Check Accuracy Long Term Sample Rate Delay time and Delta Time Measurements on page 4 34 and Check DC Voltage Measurement Accuracy Averaged on page 4 22 l Install the test hookup and preset the oscilloscope controls a Hook test signal Install the standard accessory probe on CH 1 Connect the probe tip to PROBE ADJ on the front panel leave the probe ground unconnected see Figure 4 21 TDS 420A TDS 430A amp TDS 460A Service Manual 4 53 Performance Tests Digitizing Oscilloscope MALO Figure 4 21 Initial Test Hookup b Initialize the oscilloscope W Press save recall SETUP W Press the main menu button Recall Factory Setup W Press the side menu button OK Confirm Factory Init c Mod
57. signal with the same levels as Figure 6 39 Do pins 2 and 4 of J2 see Figure 6 42 have signals similar to Figure 6 38 No No Yes Replace the cable Does J2 pin 7 on the A02 Display module see Figure 6 42 have a video signal with the same levels as Figure 6 39 A26 Monitor Assembly Replace the A02 Display module Replace the cable Is the problem fixed Figure 6 37 Monitor Troubleshooting Procedure 6 88 Replace the D1 Bus cable A03 CPU A09 DSP or A01 Backplane Assembly TDS 420A TDS 430A amp TDS 460A Service Manual Troubleshooting Stopped 572 Acquisitions ENEN 2 J2 pin 2 Horizontal Sync 31 75 kHz Rate J2 pin 4 Vertical Sync 60 Hz Rate Figure 6 38 Horizontal and Vertical Sync Signals Stopped 4974 Acquisitions uted qe E dude gem J2 pin 7 Video Black Level burrs Blanking Level gt BN Tomy 0 02 5 005 Chi 464mV Figure 6 39 A Video Signal with White Black and Blanking Levels TDS 420A TDS 430A amp TDS 460A Service Manual 6 89 Troubleshooting COO
58. signals or interpola tion of points sampled on non repetitive signals Both can increase the apparent sample rate on the waveform when maximum real time rates are reached W You can use peak detect high resolution sample envelope and average modes to acquire signals W You can set the acquisition to stop after a single acquisition or sequence of acquisitions if acquiring in average or envelope modes TDS 420A TDS 430A amp TDS 460A Service Manual Product Description On Board User Assistance Help Autoset Two features that help you set up this digitizing oscilloscope to make your measurements are help and autoset Help displays operational information about any front panel control When help mode is in effect manipulating any front panel control causes the digitizing oscilloscope to display information about that control When help is first invoked an introduction to help is displayed on screen Autoset automatically sets up the digitizing oscilloscope for a viewable display based on the input signal Measurement Assistance Cursor Measure Once you have set up to make your measurements the features cursor and measure can help you quickly make those measurements Two types of cursors are provided for making parametric measurements on the displayed waveforms Voltage can be measured between the positions of H Bar horizontal cursors and time can be measured between V Bar vertical cursors These are delt
59. substeps a through d until all input channels are verified 3 Remove the test hookup Disconnect the probe from the channel input and the probe adjust terminal Verify the Time Base Equipment Required One P6138A probe Prerequisites None l Install the test hookup and preset the oscilloscope controls a Hook the signal source Install the probe on CH 1 Connect the probe tip to PROBE ADJ on the front panel leave the probe ground uncon nected See Figure 4 3 on page 4 8 b Initialize the oscilloscope Press save recall SETUP m Press the main menu button Recall Factory Setup then press the side menu button OK Confirm Factory Init c Modify default settings W Press AUTOSET to obtain a viewable triggered display Set the horizontal SCALE to 200 us 4 10 TDS 420A TDS 430A amp TDS 460A Service Manual Brief Procedures m Press VERTICAL MENU Press the main menu button Bandwidth Then press the side menu button 20 MHz W Press CLEAR MENU to remove the vertical menu from the screen 2 Verify that the time base operates Confirm the following statements a One period of the square wave probe compensation signal is about five horizontal divisions on screen for the 200 us horizontal scale setting set in step 1c b Rotating the horizontal SCALE knob clockwise expands the waveform on screen more horizontal divisions per waveform period counter clockwise rotation contracts it and retur
60. the plastics used in this oscilloscope Use only deionized water when cleaning the menu buttons or front panel buttons Use a 75 isopropyl alcohol solution as a cleaner and rinse with deionized water Before using any other type of cleaner consult your Tektronix Service Center or representative Avoid the use of high pressure compressed air when cleaning dust from the interior of this instrument High pressure air can cause ESD Instead use low pressure compressed air about 9 psi Inspection Exterior Using Table 6 2 as a guide inspect the outside of the oscilloscope for damage wear and missing parts Oscilloscopes that appear to have been dropped or otherwise abused should be checked thoroughly to verify correct operation and performance Immediately repair defects that could cause personal injury or lead to further damage to the oscilloscope TDS 420A TDS 430A amp TDS 460A Service Manual Maintenance Table 6 2 External Inspection Check List Item Cabinet front panel and cover Front panel knobs Connectors Carrying handle bail cabinet feet Accessories Inspect For Cracks scratches deformations damaged hardware or gaskets Missing damaged or loose knobs Broken shells cracked insulation and deformed contacts Dirt in connectors Correct operation Missing items or parts of items bent pins broken or frayed cables and damaged connec tors Repair Action Replace de
61. the A07 Auxiliary Power and A25 Low Voltage Power Supply boards WARNING The power supplies will come up as soon as principal power switch S1 is in the on in position Press principal power switch S1 to the on in position Does the fuse blow there power at the line cord and outlet Yes Disconnect the cable from J1 Replace the fuse Replace the A07 Auxiliary Yes Power board and the cables Does the fuse blow going to it No Replace the A25 Low Voltage Power Supply No Fix the power problem Yes Replace the line filter Are all secondary voltages within specification see Table 6 11 and Figure 6 36 Yes Replace either the A01 Backplane or the A03 CPU boards No Press principal power switch S1 to the off out position Disconnect the cable P2 to the A01 Backplane Connect a minimum 1 load to the 5 V supply Press principal power switch S1 to the on in position No Replace the A25 Low Voltage Power Supply Yes Perform the Power Supply Overload troubleshooting procedure Are the secondary voltages within specification see Table 6 11 and Figure 6 36 Figure 6 34 Low Voltage Power Supply Troubleshooting Procedure 6 84 TDS 420A TDS 430A amp TDS 460A Service Manual Troubleshooting Table 6 11 Normal Output Voltage Supply 5 1V 15 V 6 4V 15V TDS 420A TDS 430A amp TDS 460A Serv
62. the channel under test Test all channels Repeat substeps a through e for all input channels 3 Disconnect the hookup a Set the generator output to 0 V b Then disconnect the cable from the generator output at the input connector of the channel last tested Equipment Two dual banana connectors Item 7 Required One BNC T connector Item 8 One DC calibration generator Item 10 Two precision coaxial cables Item 5 Prerequisites See page 4 15 TDS 420A TDS 430A amp TDS 460A Service Manual Performance Tests l Install the test hookup and preset the instrument controls a Hook the test signal source Output Sense Dual Banana to EA BNC Adapters Set the output of a DC calibration generator to 0 volts Connect the output of a DC calibration generator through a dual banana connector followed by 50 Q precision coaxial cable to one side of a BNC T connector see Figure 4 5 Connect the Sense output of the generator through a second dual banana connector followed by a 50 Q precision coaxial cable to the other side of the BNC T connector Now connect the BNC T connector to CH 1 Digitizing Oscilloscope DC Calibrator BNCT Connector 50 Coaxial Cables Figure 4 5 Initial Test Hookup b Initialize the oscilloscope Press save recall SETUP Press the main menu button Recall Factory Setu
63. the module replaced See Table 5 1 Table 5 1 Adjustments Required for Module Replaced Module Replaced Adjustment Required Acquisition Board Complete Adjustment Attenuator Board Complete Adjustment Front Panel Assembly None Required Low Voltage Power Supply Complete Adjustment CPU Assembly Complete Adjustment DSP Assembly None Required Display Assembly None Required TDS 420A TDS 430A amp TDS 460A Service Manual 5 3 Adjustment Procedures Adjustment Dependencies 5 4 Table 5 1 Adjustments Required for Module Replaced Cont Module Replaced Adjustment Required Auxiliary Power Supply None Required Backplane Assembly None Required Monitor Assembly None Required Some adjustments depend on the successful prior completion of other adjust ments For example the Voltage Reference Adjustment must pass before any other adjustments can be successfully completed Table 5 2 lists the adjustments and their dependencies Table 5 2 Adjustments and Dependencies Class of Adjustment Prior Completion Requirements Voltage Reference Adjustment None Low Frequency Response Adjustment Voltage Reference High Frequency Response Adjustment Voltage Reference TDS 430A and TDS 460A only Trigger Adjustment Voltage Reference Probe Adjustment Voltage Reference Low Frequency Response and High Frequency Response Monitor Adjustment None TDS 420A TDS 430A amp TDS 460A Service Manual Adjustment
64. tip Torque wrench Flat bladed screwdriver Pozidriv screwdriver Needle Nose Pliers Duck bill pliers Nutdriver inch Angle Tip Tweezers Flat bladed spudger Soldering Iron Description Accepts Torx amp driver bits Torx driver bit for T 15 size screw heads Torx driver bit for T 20 size screw heads Used only for removal of the cabinet handle 8 inch lbs torque accepts bits Screwdriver for removing standard headed screws Used for removing disk drive Standard tool Used for removing EMI gaskets 4 inch Used for removing the low voltage power supply Used for removing earth ground cables Used for knob and shaft removal A probe like tool with a tip like a flat bladed screwdriver Used to press EMI gaskets into place 15 watt Used for removal of some cables and the acquisition assembly Slip jaw pliers Used for removing the front feet from the cabinet Front cover This optional accessory protects the front of the oscilloscope when positioned face down in the removal procedures 6 12 TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures Access Procedure Begin with this procedure when you have identified a module to be removed for service and have read General Instructions found earlier in this section 1 Locate module to be removed a Find the module to be removed in the module locator diagrams figures 6
65. to Ground Lug D1 Bus Aux Supply to Line Filter NI lt 2A ou co Ss ee Monitor Cable Sw tc D 5 5 a ox os lt A 2s Lo 58 5 1 aoe Backplane to Low Volt Power Supply Backplane to Front Panel S pcs ont Panel Backplane to Attenuator P dd Soldered at Backplane Disk Drive to CPU to Fr Display B010100 B079999 Figure 6 4 Cables and cable routing TDS 420A TDS 430A amp TDS 460A Service Manual 6 22 Removal and Installation Procedures Line Trigger CRT Power Monitor Cable Backplane to Low Volt Power Supply D1 Bus Backplane to Acquisition Soldered at Backplane Backplane to Front Panel Disk Drive Display Backplane to Attenuator Soldered at Backplane Figure 6 5 Cables and cable routing B080000 amp up Procedures for Module Removal and Installation Do the Access Procedure page 6 13 before doing any procedure in this section Front Panel Knobs and 1 Assemble equipment and locate modules to be removed Have handy a pair Shafts of angled tip tweezers Item 10 Find the knob s to be removed on the front panel TDS 420A TDS 430A amp TDS 460A Service Manual 6 23 Removal and Installation Procedures 6 24 Orient the oscilloscope Set the oscilloscope so its botto
66. toggle the digitizing oscilloscope into operation The switch at the rear panel is the true power disconnect switch The ON STBY standby switch simply toggles operation on and off WARNING The principal power switch at the rear panel is the true power A N disconnect switch The ON STBY standby switch simply toggles operation on and off When connected to a power source and when the principal power switch is on some power supply circuitry in this digitizing oscilloscope is energized regardless of the setting of the ON STBY switch When connecting or disconnecting the line cord to or from the power source the principal power switch should be off TDS 420A TDS 430A amp TDS 460A Service Manual 2 7 Operating Information Position of Waveform Record Relative to Brief Status General Purpose Information Knob Readout TekRun 1 00MS s Sample the Screen and Display Waveform Reference Symbols Ground Levels and Waveform Sources Graticule and Waveforms Main Only Side menu area Readouts for measurements f 1 move here when Delayed Only is pressed Vertical Scale Horizontal h1 5 007 10097 M S s Chi 200mvp yigy Scale and Trigger Level T leni 25000 1 007 1719987 eror Horiz Horiz n Position Length Main 505 200 Controls Pos Readouts Using Help Using the Status Menu 2 8
67. troubleshooting procedures in this section to determine which module needs to be replaced The two levels of diagnostics are the short confidence set and an extended set that tests the oscilloscope circuitry in depth and takes more time At power on the oscilloscope automatically executes the short set The extended set is optional and is executed by using the following procedure Prerequisites Power up the oscilloscope and allow a 20 minute warm up before doing this procedure 1 Display the System diagnostics menu a Press SHIFT then press UTILITY b Repeatedly press the main menu button System until Diag Err is highlighted in the menu that pops up c Repeatedly press the main menu button Area until is highlighted in the menu that pops up 2 Run the System Diagnostics Press the main menu button Execute then press the side menu button OK Confirm Run Test TDS 420A TDS 430A amp TDS 460A Service Manual 6 75 Troubleshooting Firmware Updates 6 76 3 Wait The internal diagnostics do an exhaustive verification of proper oscilloscope function This verification takes about two minutes When finished the oscilloscope displays a report of any bad modules or interfaces Firmware updates are easy to do Simply install the firmware disks on your PC and follow the instructions in the README file located on the first disk The firmware update kit is listed as an optional accessory in Chapter 10 NOTE You
68. voltage power supply is a switching power converter It supplies power to all oscilloscope circuitry The low voltage power supply sends all of its power to the A01 Backplane where it is distributed to all other circuitry B080000 and up instruments The principal POWER switch located on the rear panel controls all power to the oscilloscope including the low voltage power supply The ON STBY switch located on the front panel controls all of the power to the oscilloscope except for part of the circuitry in the low voltage power supply The fan provides forced air cooling for the oscilloscope It connects to 12 V on the A01 Backplane through the A07 Auxiliary Power board The battery provides power to memory circuits that maintain calibration constants and oscilloscope setups when the oscilloscope power is off TDS 420A TDS 430A amp TDS 460A Service Manual Performance Verification Procedures Two types of Performance Verification procedures can be performed on this product Brief Procedures and Performance Tests You may not need to perform all of these procedures depending on what you want to accomplish To rapidly confirm that this oscilloscope functions and is adjusted properly just do the procedures under Self Tests which begin on page 4 5 Advantages These procedures are quick to do require no external equipment or signal sources and perform extensive functional and accuracy testing to pro
69. vs Front Corner Response 3 Disconnect the hookup Unplug the probe from the BNC to probe tip adapter Reverse the instructions in Figure 5 4 page 5 13 to reinstall the retractable probe tip 5 20 TDS 420A TDS 430A amp TDS 460A Service Manual Adjustment Procedures Monitor Assembly Adjustment WARNING High voltages are accessible on the A26 Monitor assembly Do not touch the circuit board if the power is applied Do not touch the CRT anode button even if the power cord is removed Wear safety glasses when working with the CRT Do not do this procedure when performing a routine adjustment Only do this procedure if the display on the monitor assembly has become unsatisfactory See Complete Adjustment on page 5 2 CAUTION Static electricity can damage this circuitry When standing the CRT on its front panel place it on a clean padded surface The equipment required to do this procedure is listed in Table 5 3 Equipment One J17 Photometer with a J1803 Luminance Probe Item 17 Required 1 One monitor adjustment tool Item 4 1 Access the inside of the oscilloscope See the Removal and Installation Procedures starting on page 6 9 to remove the cabinet 2 Adjust the vertical and horizontal sync a Ifthe display rolls vertically adjust V SYNC R453 to the center of the stable display range See Figure 5 11 b If diagonal lines are present on the display adjust SYNC R473 to the center of the sta
70. waveform Note the corresponding time reference point for the right most waveform See Figure 4 9 Press CURSOR then press the side menu button V Bars Press CLEAR MENU Rotate the General Purpose knob to align one cursor to the time reference point of the left most waveform edge and the other cursor to the time reference point of the right most waveform edge Press SELECT to switch between the two cursors See Figure 4 9 Read the measurement results at the cursor readout not the readout on screen g Check all channels against limit CHECK that the cursor readout on screen is 450 ps If the cursor readout is 200 ps skip substep 4 32 TDS 420A TDS 430A amp TDS 460A Service Manual Performance Tests Run 50 065 5 Average Read the results here Display the live reference waveforms for all four channels Note their overlapping ground references Identify the time reference points of the waveforms Turn on the cursor and align the V bar cursors to the time 3 ch Toon da tnt 7 7 Ch4 100 reference points 100mV 1 00ns GIOGO Co Figure 4 9 Measurement of Channel Delay h Check CH 1 to CH 2 and CH 3 to CH 4 against limit m Press WAVEFORM OFF four times to remove all waveforms Press CH 1 m Press MORE then press the main menu bu
71. 0 fie al 00000000 00000000 00000000 0000000 nnnnnnnn nnnnnnn 00000000 00000000 00000000 00000000 Figure 6 42 A02 Display Connector J2 TDS 420A TDS 430A amp TDS 460A Service Manual 6 91 Troubleshooting Use this procedure to determine if the A03 CPU or the A06 Front Panel module is bad Turn on the principle POWER Switch Do all of the front panel LEDs turn on and then turn off a short time later Press the ON STBY button Do the front panel LEDs turn ona short time later and then turn off Are the correct voltages at J101 and J106 see Figure 6 44 and Table 6 13 Replace the A06 Front Panel module Do the front panel LEDs turn on at all Does one front panel LED turn on and then turn off followed by the next LED until all LEDs have turned on and then turned off No Are all front panel cables Securely install or securely installed in their replace the front panel Sockets and are the cables cables ok The 06 Front Panel board is ok Yes Replace the A03 CPU board Figure 6 43 Processor Front Panel Troubleshooting Procedure 6 92 TDS 420A TDS 430A amp TDS 460A Service Manual Troubleshooting J106 Pin 1
72. 09 0709703XX 070 9705 XX 1 MANUAL TECH PERFORMANCE VERIFICATION 80009 0709705XX 1 CABLE ASSY PWR 3 18 AWG 92 L SVT TAN TK2432 ORDER BY DESC STANDARD SEE FIGURE 10 1 8 161 0104 05 1 CABLE ASSY PWR 3 18 AWG 240V 98 0 L 3109 SAA 3 OD38CCFC3X OPTION A3 AUSTRALIAN 161 0104 06 1 CABLE ASSY PWR 3 X 0 75MM SQ 220V 98 0 L 3109 VIIGSOPO HO5VVF OPTION A1 EUROPEAN 161 0104 07 1 CABLE ASSY PWR 3 1 0MM 50 240 VOLT 2 5 3109 ORDER BY DESC OPTION A2 UNITED KINGDOM 161 0104 08 1 CABLE ASSY PWR 3 18 AWG 98 L SVT GREY BLK 70903 ORDER BY DESC OPTION A4 NORTH AMERICAN 161 0167 00 1 CABLE ASSY PWR 3 0 X 0 75 6A 240V 2 5M L 3109 ORDER BY DESC OPTION A5 SWITZERLAND 1 CLAMP PWR CORD POLYMIDE TK1163 ORDER BY DESC SEE FIGURE 10 1 9 OPTIONAL ACCESSORIES 003 1463 00 1 WRENCH BNC WRENCH FOR BNC FIXTURE 80009 003146300 003 1464 00 1 FIXTURE BNC BNC FIXTURE FOR TDS400 80009 003146400 012 0991 00 1 CABLE COMPOSITE IDC GPIB 2 METER 24 COND 00779 553577 3 012 0991 01 1 CABLE GPIB LOW EMI 1 METER 00779 553577 2 016 1154 00 1 HOOD ASSEMBLY 2KDSO 80009 016115400 016 1157 00 1 CASE CARRYING 26 X 22 X 12 HARD TRANSFER 34416 ORDER BY DESC 016 1158 01 1 CASE CARRYING SOFT PADDED OPTIONS 80009 016115801 016 1166 00 1 RACK MOUNT KIT RACK MOUNT TDS400 80009 016116600 063 2634 00 1 SOFTWARE PKG FIELD ADJUST 80009 063263400 067 0208 00 1 FIXTURE CAL RECOVERING TIME 80009 067020800 SERTER 1 COVER FRONT ASB SEE FIGURE 10 1 22 0
73. 0A amp TDS 460A Service Manual Removal and Installation Procedures c gt 5 o 2 gt 95 m 2 9 9 o 902 a lt lt o0 S 9 2 SI Ka Mounting Screw Correction module B080000 and up Mounting Screw BNC Connector and LV Power Supply p Power Factor lt Mounting Screw A0 Board Support 3 A04 Acquisition Assembly Mount Backplane Battery 2 Mounting Screws Battery Clamp 2 Mounting Screw A25 Low Voltage Power Supply Assembly 2 o z 5 gt 5 38 se lt A26 Monitor Assembly Retainer Mounting Screw Mounting A08 Jumper Assembly A05 Attenuator Attenuator Assembly Shield Figure 6 3 Internal modules 6 19 TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures Table 6 7 Access and Removal Instructions for Cables in Figure 6 4 Name of Cable 1 Disk to CPU 2 Backplane to Acquisition Backplane to Attenuator 3 Backplane to Front Panel CPU to Front Panel 4 Backplane to Low Voltage Power Supply Access and Removal Instructions 1 2 Lift up on the latch at each side of both jacks Unplug the cable to be replaced from the disk drive and A03 CPU assembli
74. 1 see Figure 4 10 Set the output of the standard to 100 MHz or a period of 10 ns Time Digitizing Oscilloscope Standard Output Attenuator if necessary 50 Q Coaxial Cable Figure 4 10 Initial Test Hookup b Initialize the oscilloscope Press save recall SETUP Press the main menu button Recall Factory Setup Press the side menu button OK Confirm Factory Init 4 34 TDS 420A TDS 430A amp TDS 460A Service Manual Performance Tests c Modify the initialized front panel control settings Press VERTICAL MENU then press the main menu button Coupling Press the side menu button to change the coupling setting to 50 9 If necessary set the vertical SCALE to 100 mV per division Set the horizontal SCALE of the Main time base to 2 0 ns Using external attenuators if necessary adjust the time standard amplitude for a 5 to 7 division display Rotate the vertical POSITION control to center the displayed waveform 2 Confirm Main and Delayed time bases are within limits for accuracies a Check delta time accuracy against limits Press SET LEVEL TO 50 Press SHIFT then ACQUIRE MENU Now press the main menu button Mode then press the side menu button Average Use the General Purpose knob to set the number of averages to 8 Press MEASURE Press the main menu button High Low Setup then press the side menu button Min Max Press the main menu button Sel
75. 1 tween channels 4 Termination 75 Impedance 75 connectors female Tektronix part number Used to test Video Option 05 BNC input male BNC output 011 0102 01 equipped oscilloscopes only 5 Cable Precision Coaxial 50 36 in male to male BNC Tektronix part number Signal Interconnection three required connectors 012 0482 00 6 Cable Coaxial 75 36 in male to male BNC Tektronix part number Used to test Video Option 05 connectors 012 1338 00 equipped oscilloscopes only 7 Connector Dual Banana Female BNC to dual banana Tektronix part number Various Accuracy Tests two required 103 0090 00 8 Connector BNC Male BNC to dual female BNC Tektronix part number Checking Trigger Sensitivity 103 0030 00 9 Coupler Dual Input Female BNC to dual male BNC Tektronix part number Checking Delay Match Be 067 0525 02 tween Channels 10 Generator DC Calibra Variable amplitude to 110 V accura Wavetek 9100 or optionally Checking DC Offset and tion cy to 0 1 Data Precision 8200 with 1 kV option installed Measurement Accuracy 11 Generator Sine Wave 100 kHz to at least 400 MHz Variable Rohde amp Schwarz 5 Checking Analog Bandwidth amplitude from 12 mV to 2 Vp p Trigger Sensitivity Sample Frequency accuracy 2 096 rate External Clock and Delay Time Accuracy 12 Meter Level and Power Frequency range 10 MHz to 400MHz Rohde amp Schwarz URV 35 Checking Analog Bandwidth Senso
76. 100 B079999 10 9 TDS 420A TDS 430A amp TDS 460A Service Manual Fig amp Tektronix Serial No Mfr Index No Part No Effective Dscont Qty Name amp Description Code Mfr Part No B080000 UP 10 3 1 426 2436 01 1 FRAME CRT FLTR POLYCARBONATE TK1163 ORDER BY DESC 2 348 1291 00 2 SHLD GSKT ELEK CLIP ON EM GASKET 30817 9760 5090 20 3 213 0882 00 31 SCREW TPG TR 6 32 X 0 437 TAPTITE PNH STL 0 01 ORDER BY DESC 4 640 0079 02 1 DISPLAY MODULE 7 INCH MONOCHROME P31 80009 640007902 5 426 2426 00 1 FRAME FAN MTG POLYCARBONATE 80009 426242600 6 407 4491 01 1 BAFFLE AIR AL TK1985 407 4491 00 7 211 0722 00 4 SCREW MACHINE 6 32 X 0 25 PNH STL 0KB01 ORDER BY DESC 8 213 0978 00 1 SCREW TPG TR 6 32 X 0 500 FLH100 STL CDPL T 10 0KB01 ORDER BY DESC 9 129 1552 00 1 SPACER POST 0 660 OVERALL 0 440H 0 25 HEX W 6 32 TK0588 129 1450 01 EXT THD X 6 32 THD STUD 0 200 MIN INT THD 10 119 1770 00 1 FAN ASSEMBLY 12VDC 1 72W 35CFM W CONN 84246 CUDC12D4 11 119 5557 02 1 POWER SPLY CUSTOM AC DC 225W 90 132 180 250VAC 26003 119 5557 02 IN 5 1V 15A 15V 3 5A 6 4V 12 119 6486 00 1 POWER SUPPLY 300W PFC MODULE 85 275VAC 45 66HZ 26003 PS2290 95 132VAC 360 440HZ 6A IN 400VDC 0 75A OUT 85 13 386 6159 00 1 SUPPORT CKT BD BACK PLANE amp PWR SPLY 80009 386615900 14 334 3003 00 1 MARKER IDENT DANGER POWER LINE TK0860 ORDER BY DESC 15 131 0955 00 1 CONN RF JACK BNC 50 OHM FEMALE STR 00779 87 3334 017 16 407 4032 00 2 BRACKET CKT BD 80009 407403200
77. 17 671 3268 01 1 CIRCUIT BD ASSY CPU 80009 671326801 18 671 3902 00 1 CIRCUIT BD ASSY DISPLAY 80009 671390200 19 671 3588 00 1 CIRCUIT BD ASSY DSP 80009 671358800 STANDARD 671 3284 00 1 CIRCUIT BD ASSY DSP 80009 671328400 OPTION 1M 20 386 6158 00 3 SUPPORT CKT BD MAT MATERIAL 80009 386615800 21 146 0056 02 2 BATTERY 3V 1200MAH 2 3A LITHIUM BATTERY ODWW6 ORDER BY DESC 22 671 3597 01 1 CIRCUIT BD ASSY ACQUISITION 80009 671359701 TDS420A ONLY 671 1685 12 1 CIRCUIT BD ASSY ACQUISITION 80009 671168512 TDS460A ONLY 671 3980 00 1 CIRCUIT BD ASSY ACQUISITION TDS430A ONLY 80009 671398000 23 344 0116 00 2 RTNR CAPACITOR 0 625 DIA STEEL TK1891 50003 007 24 671 1683 00 1 CIRCUIT BD ASSY JUMPER 80009 671168300 25 671 3595 01 1 CIRCUIT BD ASSY ATTENUATOR 80009 671359501 TDS420A ONLY 671 1686 07 1 CIRCUIT BD ASSY ATTENUATOR 80009 671168607 TDS460A ONLY 671 3979 00 1 CIRCUIT BD ASSY ATTENUATOR 80009 671397900 TDS430A ONLY 26 337 3713 01 1 SHIELD ELEC ATTENUATOR 1935 337371301 27 671 1676 03 1 CIRCUIT BD ASSY BACKPLANE 80009 671167605 28 200 3660 00 1 COVER AUTO CAL POLYCARBONATE 1163 ORDER BY DESC 29 441 2072 01 1 CHASSIS ASSY ALUMINUM 80009 441207200 10 10 TDS 420A TDS 430A amp TDS 460A Service Manual Figure 10 3 Internal modules B080000 Up 10 11 TDS 420A TDS 430A amp TDS 460A Service Manual Fig amp Tektronix Serial No Mfr Index No Part No Effective Dsco
78. 2 A06 FRONT PANEL LINE FILTER A09 50 FL52 DSP POWER SWITCH A25 LOW VOLTAGE POWER SUPPLY AUX POWER FUSE FAN 7 A01 BACKPLANE A07 Figure 9 3 TDS 400A Block Diagram B010100 B079999 9 4 TDS 420A TDS 430A amp TDS 460A Service Manual Diagrams REAR PANEL 2 Floppy 26 Drive 10 DIAG PORT 10 PROCESSOR RS 232 PORT SYSTEM 25 GPIB IEEE 488 PORT A03 CPU 98 MONITOR ASSEMBLY 15 VIDEO DISPLAY VGA 8 A02 VIDEO 98 2 OPTION 13 25 A10 SERPAR Figure 9 4 TDS 400A Block Diagram B010100 B079999 Cont TDS 420A TDS 430A amp TDS 460A Service Manual A26 AUX TRIGGER EXT CLOCK lt 6V MONITOR 2A FUSED RS 232 DTE PORT CENTRONICS COMPATIBLE Diagrams MENU 10PINS 10 PINS J405 Jo SWITCHES 4 PINS B CAL SIG Ai7 BEZELBUTTON J101 10 PINS A16 FLEX P1 14 PINS J104 J106 1 14PINS 5 PINS 06 FRONT PANEL 05 ATTENUATOR A1W2 20 J101 18 PINS 18 TDS 460A ONLY TDS 420A amp bi 25 LOW VOLTAGE PWR SUPPLY J2 22 PINS B J7 10 PINS J3 2 2 PINS 5 PINS 2 PINS IT AUX TRIG EXT CLOCK d 20PINS 34 PINS lt 6V 34 PINS 5 J6 INTRG 2 PINS 50 PINS OPTION 2 NO BLOCK DIAGRAMS SPINS J2 FOR THESE BOARDS THESE REPLACEABLE CABLES ARE LISTED IN SECTION 10 LINE FILTER PFC
79. 2 6 3 and 6 4 pages 6 16 6 19 and 6 22 respectively Note the number of the figure in which you found the module and the module name 2 Access the module a If you have located the module to be replaced in Figure 6 2 do the following subparts Go to Table 6 5 on page 6 15 Find the procedure that includes the name of the module noted in stepl Perform the access instructions listed for the procedure found to access and remove the module Skip to the end of this procedure step 3 for reinstallation instructions If you have found the module to be removed in either Figure 6 3 or Figure 6 4 cabinet removal is required First do Line Fuse and Line Cord on page 6 26 removing only the line cord Then do Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet on page 6 27 removing only the rear cover and cabinet Continue with step 2c If you have located the module to be replaced in Figure 6 3 do the following subparts Go to Table 6 6 on page 6 17 Find the procedure that includes the name of the module noted in stepl Perform the access instructions listed for the procedure found to access and remove the module TDS 420A TDS 430A amp TDS 460A Service Manual 6 13 Removal and Installation Procedures 6 14 m Skip to the end of this procedure step 3 for reinstallation instructions d If you have located the module to be replaced in Figure 6 4 you are removing on
80. 420A TDS 430A amp TDS 460A Service Manual iii vi xi xiii xvi xvi xvi xvii PP dt NNN ANWR 9 BAR A I 1 m T PRR Table of Contents Signal Acquisition System 4 20 Time Base System Checks 4 34 Trigger System Checks ores pere eet BEA edm tenen e eR RR S 4 38 Output Signal Cheek gt ssp Re NA Ur RN GUI ERR 4 53 Sine Wave Generator Leveling Procedure 4 55 Adjustment Procedures Adjustment Procedures 5 1 Requirements for Performance 5 1 Usage s sto ee Duet eL irae Ta 5 2 Equipment Required eesis toires ever or ee eb ehe ree 5 5 Adjustment Instructions 5 7 Probe Adjustment a c xo ou ben ev EE PU eb per eben 5 10 Monitor Assembly Adjustment 5 21 Maintenance Mamten nce ieseiv eee rece erbe rale id aae ae 6 1 Related Maintenance Procedures 6 1 Preparation is esee ree pret ede Are oe 6 2 Inspection and Cleaning 1 6 4 Removal and Installation Procedures 6 9 Preparation Please Rea
81. 430A amp TDS 460A Service Manual 1 21 Warranted Characteristics 1 22 TDS 420A TDS 430A amp TDS 460A Service Manual Typical Characteristics This section contains tables that list the various typical characteristics that describe the TDS 400A Digitizing Oscilloscopes Typical characteristics are described in terms of typical or average performance Typical characteristics are not warranted This subsection lists only typical characteristics A list of warranted characteris tics starts on page 1 15 Table 1 17 Typical Characteristics Signal Acquisition System Name Accuracy DC Voltage Measurement Not Averaged Frequency Limit Upper 100 MHz Band width Limited Frequency Limit Upper 20 MHz Band width Limited Nonlinearity Analog Bandwidth DC 1 MQ Coupled with Standard Accessory Probe Attached Description Measurement Type DC Accuracy Any Sample 1 5 x reading Net Offset Offset Accuracy 0 13 div 0 6 mV Delta Volts between any two sam 1 5 x reading 0 26 div 1 2 mV ples 100 MHz 20 MHz 1 DL differential 1 DL integral independently based Volts Div TDS 420A TDS 430A and TDS 460A Bandwidth Bandwidth 5 mV div 10 V div DC 200 MHz DC 400 MHz 2 mV div 4 98 mV div DC 150 MHz DC 250 MHz 1 mV div 1 99 mV div DC 100 MHz DC 100 MHz TDS 420A TDS 430A amp TDS 460A Service Manual 1 23 Typical Character
82. 5 unless servicing a broken power supply mount or removing that mount for cleaning 5 Remove the power supply mount a Place the digitizing oscilloscope so its left side is down with its top facing you b Depress the two retainer locks and slide the power supply mount towards the top of the digitizing oscilloscope to unlock from the chassis TDS 420A TDS 430A amp TDS 460A Service Manual 6 61 Removal and Installation Procedures c Liftthe power supply mount out of the chassis to complete the removal When reinstalling the power supply mount be sure to press it flush against the chassis before sliding it towards the bottom of the chassis to lock 6 Reinstallation a Ifthe power supply mount was removed do the following subparts Do in reverse order substeps 5a 5c reversing the removal instruc tions in each substep to reinstall the assembly m See A02 Display Assembly on page 6 47 to reinstall that assembly m See A09 DSP Assembly on page 6 48 to reinstall that assembly m See A03 CPU Assembly on page 6 45 to reinstall that assembly m See A08 Jumper Board Assembly D1 Bus and Board Supports page 6 44 to reinstall the board supports and D1 bus only b Perform in reverse order substeps 4a 4j reversing the removal instruc tions in each substep to reinstall the assembly Be sure to seat the board until all of the four flex locks are locked c See the following procedures to replace the modules rem
83. 6 63 o Trim Ring Menu Elastomer Menu Buttons and Front EMI Gaskets page 6 31 p Disk Drive page 6 34 q A06 Front Panel Assembly ESD Shield and Menu Flex and Probe Code Flex Circuits page 6 35 r Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet page 6 27 s Line Fuse and Line Cord page 6 26 TDS 420A TDS 430A amp TDS 460A Service Manual 6 73 Removal and Installation Procedures 6 74 TDS 420A TDS 430A amp TDS 460A Service Manual Troubleshooting Diagnostics This section contains information and procedures designed to help you isolate faulty modules in the oscilloscope If a module needs to be replaced follow the Removal and Installation Procedures located on page 6 9 If servicing a TDS 430A follow the procedures for the TDS 460A but ignore all references to CH 3 and CH 4 CAUTION This oscilloscope operates over several ranges of line voltage see Source Voltage and Frequency on page NO TAG of Chapter 1 Specification Before stepping the line voltage from one range to a higher range set the principal power switch rear panel to its OFF position Failure to do so can damage the oscilloscope The oscilloscope has two levels of internal diagnostics that focus on verifying adjusting and if need be isolating faulty modules Both levels of internal diagnostics report any bad modules or interfaces If the diagnostics do find a bad module or interface use the
84. 70 8521 XX 12 MANUAL TECH RACKMOUNT 80009 0708521XX OPTION 1R ONLY 070 8567 XX 1 MANUAL TECH RS 232 CENTRONICS 80009 0708567 OPTION 13 ONLY 070 8722 XX 12 MANUAL TECH INSTRUCTION 80009 0708722 TDS4F5P ONLY 070 8762 XX 1 MANUAL TECH USER VIDEO DISPLAY 80009 0708762XX OPTION 05 ONLY 10 16 TDS 420A TDS 430A amp TDS 460A Service Manual
85. A frequency response adjustment is required Chapter 5 m Trigger Skew A trigger skew adjustment is required Chapter 5 Error Log Errors logged are lost TDS 420A TDS 430A amp TDS 460A Service Manual Installation Table 2 3 Effects of Corrupted Data Cont Corrupted Data Type Results Reference Waveforms Waveform Lost Saved Setups Setup Lost Repackaging Instructions Use a corrugated cardboard shipping carton having a test strength of at least 125 kg 275 pounds and with an inside dimension at least 152 4 mm 6 inches greater than the oscilloscope dimensions The original shipping carton if available meets these requirements If the oscilloscope is being shipped to a Tektronix Service Center enclose the following information the owner s address the name and phone number of a contact person the type and serial number of the oscilloscope the reason for returning to oscilloscope and a complete description of the service required Seal the shipping carton with an industrial stapler or strapping tape Mark the address of the Tektronix Service Center and also your own return address on the shipping carton in two prominent locations Installed Options Your oscilloscope may be equipped with one or more options Except for the line cord options described by Table 2 2 on page 2 2 of this chapter all options and optional accessories are listed and described in Chapter 7 Options For further information an
86. B interface IEEE Std 488 1 1987 IEEE Std 488 2 1987 standard Self compensation and self diagnostic features built into the digitizing oscilloscope to aid in fault detection and servicing are also accessible using commands sent from a GPIB controller The oscilloscope also provides the following output capabilities Output of the current oscilloscope screen including waveforms to a variety of graphic printers and plotters to obtain hard copies You can start a hardcopy from the oscilloscope front panel you are not required to connect into a system controller environment The hard copies obtained are WYSIWYG What You See Is What You Get based on what is displayed at the time hardcopy is invoked m Output of display hard copies of oscilloscope control setups and of waveforms to a floppy disk in the oscilloscope file system Output of the oscilloscope display for monitoring or other processing from a VGA compatible video output on the oscilloscope rear panel The TDS 400A Digitizing Oscilloscopes offer flexible display options You can customize the following attributes of your display W Intensity waveforms readouts graticule and other things m Style of waveform display s vectors or dots intensified or non intensified samples and infinite or variable persistence m Display format XY or YT and graticule type This digitizing oscilloscope also provides an easy way to focus in on those waveform features you wish to ex
87. Batteries burn hazard if mistreated Do not recharge rapidly discharge disassemble heat N CAUTION The batteries used in this oscilloscope can present a fire or chemical above 100 C or incinerate Replace batteries with the part number listed in the Replaceable Parts List only Use of another battery presents a risk of fire or explosion Dispose of used batteries promptly Small quantities of used batteries may be disposed of in normal refuse Keep away from children Do not disassemble and do not dispose of in fire STOP Disconnection of the batteries from their plugs results in the loss of all saved front panel setups and saved waveforms Adjustment constants stored internally when the oscilloscope is adjusted are not lost 1 Assemble equipment and locate modules to be removed Locate the back up battery to be removed in the locator diagram Internal Modules Figure 6 3 page 6 19 2 Orient the digitizing oscilloscope Set the digitizing oscilloscope so its top is down on the work surface with its right side facing you 3 Remove back up battery 1 Unplug the back up battery cable at J5 of the CPU assembly Then pull the battery out of its clamp near the front of the chassis to remove 4 Remove back up battery 2 Unplug the back up battery cable at J5 of the DSP assembly Then pull the battery out of its clamp near the front of the chassis to remove 5 Remove the battery retaining clip If replacement of t
88. C on the A05 Attenuator board Attenuators Circuitry in the attenuator selects the input coupling the termina tion and the attenuation factor The processor system controls the attenuators TDS 420A TDS 430A TDS 460A Service Manual 3 1 Theory of Operation 3 2 For example if 50 input termination is selected and the input is overloaded the processor system switches the input to the 1 MQ position The preamplifier in the A05 Attenuator amplifies the input signals Probe Coding Interface Probe coding interface signals pass through the A06 Front Panel to the processor system Jumper Signals from the attenuators pass through the A08 Jumper board to the acquisition system Acquisition System The acquisition system converts the analog input signals to digital signals and controls the acquisition process under direction of the processor system The acquisition system includes the trigger acquisition timing and acquisition mode generation and control circuitry D1 Bus The acquisition system passes the digital values representing the acquired waveform through the D1 bus to the A09 DSP board TriStar This happens after a waveform acquisition is complete if the digital signal processor DSP requests the waveform Processor System The processor system consists of a 68020 microprocessor that controls the entire instrument It includes the firmware program for the oscillo scope The firmware can be reprogrammed by using t
89. DS 420A 6138 single unit per channel P6138A 10X Passive TDS 430A P6138A 10X Passive TDS 460A T 2 TDS 420A TDS 430A amp TDS 460A Service Manual Options and Accessories Optional Accessories You can also order the optional accessories listed in Table 7 3 Table 7 3 Optional Accessories Accessory Part Number Front Cover 200 3232 00 Service Manual 070 9703 XX Printed Programmer Manual 070 9876 XX Video Clamp 013 0278 00 Current Probe Calibrator TCP202 High Voltage Differential Probe P5205 High Voltage Differential Probe P5200 Analog Differential Amplifier ADA400A Plotter GPIB and Centronics Standard HC100 Plotter Centronics Standard HC200 Oscilloscope Cart K212 Oscilloscope Camera C9 Oscilloscope Camera Adapter 016 1154 00 Soft Sided Carrying Case 016 1158 01 Transit Case 016 1157 00 GPIB Cable 1 meter 012 0991 01 GPIB Cable 2 meter 012 0991 00 Printer Pack with Seiko DPU 411 printer and accessory pouch TDS4F5P Pouch includes mounting plate 016 1159 00 VGA Cable Required to meet all emissions specifications 5 number Accessory Probes Table 7 4 lists compatible probes recommended for use with your digitizing oscilloscope Table 7 4 Compatible Probes Probe Type Tektronix Model Description Passive high impedance voltage P6138A 10X 400 MHz P6101B 1X 15 MHz Passive SMD P6563A 20X 500 MHz TDS 420A TDS 430A amp TDS
90. DSP math the oscillo scope can compute and display three advanced math waveforms integral of a waveform differential of a waveform and an FFT Fast Fourier Transform of a waveform With this option Tektronix ships a test data report for the oscilloscope TDS 420A TDS 430A TDS 460A Service Manual 7 1 Options and Accessories Options 1 5 Besides the standard North American 110 V 60 Hz power cord Tektronix ships International Power Cords of five alternate power cord configurations listed in Table 7 1 with the oscilloscope when ordered by the customer Table 7 1 International Power Cords Option Power Cord M Universal European 220 V 50 Hz A2 UK 240 V 50 Hz A3 Australian 240 V 50 Hz A4 North American 240 V 60 Hz 5 Switzerland 220 V 50 Hz Option Li French User With this option Tektronix ships a French language user manual Manual Option L3 German User With this option Tektronix ships a German language user manual Manual Option L5 Japanese User With this option Tektronix ships a Japanese language user manual Manual Standard Accessories Table 7 2 lists the standard accessories that are included with the digitizing oscilloscope Table 7 2 Standard Accessories Accessory Part Number User Manual 070 9701 XX Reference 020 2192 XX Performance Verification 070 9705 XX U S Power Cord 161 0230 01 Probes one P6138 P6138A 10X Passive T
91. ELEC ESD PROTECTION 0 005 ST STL 80009 131596500 29 260 2539 00 1 SWITCH SET BEZEL TK1918 260253900 30 259 0086 00 1 FLEX CIRCUIT BEZEL BUTTON 07416 ORDER BY DESC 31 105 1081 00 1 BRKT ADAPTER FLOPPY DISK DRIVE TK1163 105108100 211 0866 01 1 SCREW PHIL M2 5 x 10 PNH BRZN 0KB01 211 0866 01 10 6 TDS 420A TDS 430A amp TDS 460A Service Manual y 2 POS S Figure 10 1 External and front panel modules 10 7 TDS 420A TDS 430A amp TDS 460A Service Manual Fig amp Tektronix Serial No Mfr Index No Part No Effective Dscont Qty Name amp Description Code Mfr Part No B0101000 B079999 10 2 1 426 2436 01 12 FRAME CRT FLTR POLYCARBONATE TK1163 ORDER BY DESC 2 348 1291 00 2 SHLD GSKT ELEK CLIP ON EM GASKET 30817 9760 5090 20 3 213 0882 00 37 SCREW TPG TR 6 32 X 0 437 TAPTITE PNH STL 0 01 ORDER BY DESC 4 640 0079 02 1 DISPLAY MODULE 7 INCH MONOCHROME P31 80009 640007902 5 426 2426 00 12 FRAME FAN MTG POLYCARBONATE 80009 426242600 6 671 1682 00 1 CIRCUIT BD ASSY AUXILIARY POWER 80009 671168200 S 119 1770 00 1 FAN ASSEMBLY 12VDC 1 72W 35CFM W CONN 54246 CUDC12D4 8 119 5557 02 1 POWER SUPPLY 100VAC AT 440 HZ 50463 PSI 135X 38 69 9 386 6159 00 1 SUPPORT CKT BD BACK PLANE amp PWR SPLY 80009 386615900 10 334 3003 00 1 MARKER IDENT DANGER POWER LINE TK0860 ORDER BY DESC 11 119 5028 00 1 FILTER RFI 4A 250V 48 TO 440HZ 80009 119502800 12 131 0955 00 12 CONN RF JACK BNC 50 OHM FEMALE STR
92. FFT User interface A graphical user interface on line help and a logical front panel layout TDS 420A TDS 430A amp TDS 460A Service Manual 1 1 Product Description User Interface 1 2 Menus Indicators General Purpose Knob GUI This digitizing oscilloscope uses a combination of front panel buttons knobs and on screen menus to control its many functions The front panel controls are grouped according to function vertical horizontal trigger and special Within each group any function likely to get adjusted often such as vertical positioning or the time base setting is set directly by its own front panel knob Those functions for which control settings are usually changed less often such as vertical coupling and horizontal mode are set indirectly That is pressing one sometimes two front panel button such as VERTICAL displays a menu of functions at the bottom of the screen that are related to that button For the VERTICAL button the menu displayed contains functions such as coupling and bandwidth Using the buttons below this main menu to select a function such as coupling displays a side menu of settings for that function such as AC DC or GND ground coupling at the right side of the screen Use the buttons to the right of the menu to select a setting such as DC Several on screen readouts help you keep track of the settings for various functions such as vertical an
93. HORIZONTAL MENU Press the main menu button Trigger Position press the side menu button 10 c Make the adjustments Locate the various adjustments in Figure 5 9 Manually adjust the front corner response of the probe to best match the response of the Ref 1 waveform Note that it is more important to match the response during the first 5 ns than during the entire first 20 ns the adjustments affect See Figure 5 10 to see what areas on the front corner that the various adjustments affect TDS 420A TDS 430A amp TDS 460A Service Manual Adjustment Procedures R1 Not Used R2 Figure 5 9 Locations of Probe Adjustments d Recheck Probe Bandwiath m Redo the procedure Measure the Probe Bandwidth to check if the probe now meets its bandwidth requirement m If bandwidth is met adjustment is complete Skip to step 3 m If bandwidth is not met redo this procedure increasing front corner overshoot slightly relative to the stored waveform m Repeat this step d until bandwidth is met TDS 420A TDS 430A amp TDS 460A Service Manual 5 19 Adjustment Procedures 20 ns R1 10 ns R2 5ns 4 gt C1 Positive Pulse 1 Adjust R1 for best overall match 2 Adjust R2 and C1 for best match between front corners 3 Repeat the first two steps as needed due to interaction between adjustments Negative Pulse 915 p C1 10 ns R2 20 ns gt R1 Figure 5 10 Adjustments
94. L CD PL 0KB01 ORDER BY DESC 15 211 0840 00 1 SCREW MACHINE M2 6 X 0 45MM PITCH X 4 0 MM 0KB01 26C4MXP 16 259 0085 00 1 FLEX CIRCUIT PROBE CODE 80009 259008500 17 348 1258 00 4 SHLD GASKET ELE 2 LAYER 0 094 X 0 188 X 8 750 80009 348125800 18 672 1470 00 1 CIRCUIT BD ASSY FRONT PANEL ASSY 80009 672147000 TDS430A ONLY 672 1436 00 1 CIRCUIT BD ASSY FRONT PANEL ASSY 80009 672143600 TDS420A ONLY 672 1532 00 1 CIRCUIT BD ASSY FRONT PANEL ASSY 80009 672153200 TDS460A ONLY 19 384 1689 01 6 SHAFT EXTENDER ACETAL 80009 384168901 20 366 2113 00 3 KNOB MEDIUM DETENTED TK1163 ORDER BY DESC 21 366 2111 00 3 KNOB SMALL FLUTED TK1163 ORDER BY DESC 22 200 3232 01 1 COVER FRONT ASB TK1908 ORDER BY DESC OPTIONAL ACCESSORY 23 354 0709 00 1 RING TRIM LEXAN 940 80009 354070900 TDS420A 460A ONLY 354 0736 00 1 TRIM DECORATIVE FRONT 80009 354073600 TDS430A ONLY 24 366 2164 00 14 PUSH BUTTON SMOKE TAN 80009 366216400 25 334 8820 00 1 MARKER IDENT BEZEL 80009 334882000 TDS460A ONLY 334 8821 00 1 MARKER IDENT BEZEL 80009 334882100 TDS420A ONLY 334 9232 00 1 MARKER IDENT BEZEL 80009 334923200 TDS430A ONLY TDS 420A TDS 430A amp TDS 460A Service Manual 10 5 Fig amp Tektronix Serial No Mfr Index No Part No Effective Dscont Qty Name amp Description Code Mfr Part No 10 1 26 119 5677 01 1 DISK DRIVE FLOPPY 3 5 INCH 1 44MB 50356 FD 04HF 2300 27 200 4219 00 1 COVER DISK DRIVE 3 5 INCH 80009 200421900 28 131 5965 00 2 CONTACT
95. LEAR MENU 2 Adjust the Probe a Display and store the reference signal Set the high amplitude output of the generator for 60 to 100 V at the input to the pulse generator head see Figure 5 8 Advance the triggering level of the pulse generator head until a five to six division square wave appears on screen Push SET LEVEL TO 50 as required to trigger the signal Advance the horizontal SCALE to 5 ns Press HORIZONTAL MENU Press the main menu button Trigger Position and press the side menu button 10 Push SHIFT Then press SAVE WAVEFORM Press the main menu button Save Waveform Then press the side menu button To Ref 1 TDS 420A TDS 430A amp TDS 460A Service Manual 5 17 Adjustment Procedures Output Digitizing Oscilloscope Pulse Generator e CE O OOO BNC Female to Pulse Generator BNC Female BNC to Probe Head Adapter Tip Adapter Figure 5 8 Probe Test Hookup Press MORE Then push the main menu button Ref 1 b Display the test signal Disconnect the pulse generator head at CH 1 and remove the 10X attenuator Connect the output of the pulse generator head through a BNC female to BNC female adapter to a BNC to probe tip adapter Install the probe on CH 1 Plug the probe tip from the probe into the BNC to probe tip adapter Press the main menu button Coupling Then press the side menu button Q to toggle to 1 MQ coupling Press
96. LT L OOOOOOOOONM J107 Pin 1 Figure 6 44 A06 Front Panel Board Power Connectors J101 and J106 Table 6 13 Front Panel Connector Voltages Connector Pin Nominal Voltage J101 Pins 2 and 4 51V J106 Pin 1 15V J106 Pin 2 51V J106 Pin 4 5V J106 Pin 5 15V TDS 420A TDS 430A amp TDS 460A Service Manual 6 93 Troubleshooting Use this procedure to isolate a problem between the A04 Acquisition A08 Jumper and A05 Attenuator boards This procedure assumes that the oscilloscope is not displaying or not triggering properly on one or more channels It also assumes that the power up diagnostic fails with FAIL Acq FAIL Attn FAIL Cpu Acq FAIL Acq Attn messages This procedure is for CH 1 but you can used it for all four input channels by substituting the appropriate data from Table 6 14 Perform the Acquisition and Attenuator Power troubleshooting procedure Is the power ok Supply troubleshooting procedure Attach a X10 probe to the CH 1 input Attach the probe tip to the PROBE ADJUST connector on the front panel Set the trigger source to CH1 and press AUTOSET Set the Vertical SCALE to 10 mV Set your bench oscilloscope to 500 us per division 200 mV per division bandwidth limit to 20 MHz and AUTO trigger Are pins 26 27 and 29 of P1 see Figure 6 46 The tested channel about of the A05 Attenuator 400 mV 1 kHz
97. MODULE Figure 9 5 TDS 400A Interconnections B080000 amp up 9 6 TDS 420A TDS 430A amp TDS 460A Service Manual Diagrams A03 CPU TO BT10 RS 232 a 10PINS 2PINS 30 DIAG PORT a 10 PINS J6 GPIB 25 PINS gt IEEE STD J TRON lt 100 PINS 488 PORT 10 P1 amp P2 J3 10 A gt gt FLOPPY DRIVE 1 18 TERMINATIONS W2 20 TERMINATIONS P1 amp P3 98 PINS LH a 98 PINS Ei 2 PIN t RS d J60 s gt s CENTRONICS 25 PINS COMPATIBLE A10 SERPAR 22 PINS J6 10 PINS 01 BACKPLANE J901 10 PINS A26 MONITOR Figure 9 5 TDS 400A Interconnections B080000 amp up Cont TDS 420A TDS 430A amp TDS 460A Service Manual 9 7 Diagrams ATTENUATORS 34 A08 34 ACQUISITION JUMPER SYSTEM TDS 420A amp TDS 460A ONLY TDS 420A amp TDS 460A ONLY A05 ATTENUATOR 50 PROBE CODING INTERFACE FRONT PANEL A04 ACQUISITION A15 SWITCHES MENU SWITCHES FRONT PANEL 17 BEZELBUTTON 08 FRONT PANEL POTS PROBE GND COMPENSATION 2 A06 FRONT PANEL FAN PFC MODULE A07 LOW VOLTAGE POWER SUPPLY LINE FILTER FL52 A01 BACKPLANE FUSE Figure 9 6 TDS 400A Block Diagram B080000 amp up 9 8 TDS 420A TDS 430A amp TDS 460A Service Manual Diagrams AUX TRIGGER EXT CLOCK 6V REAR PANEL BATTERY 2 Floppy 26 Drive 10 DIAG PORT 10 PROCESSOR RS 232 PORT SYSTEM
98. N to 0 V Press the VERTICAL MENU button and then the Offset main menu button Set the offset to Set the generator Set the DC calibration generator to 0 35 V Record Measurement Read the mean at the measurement readout and record this number on a piece of scratch paper Set the generator Set the DC calibration generator to 0 35 V TDS 420A TDS 430A amp TDS 460A Service Manual Performance Tests e Check against limits Do the following subparts in the order listed W Use this formula to calculate voltage measurement accuracy 700 mV mean from step c present mean For example 700 mV 347 mV 358 mV 5 mV m CHECK that the voltage measurement accuracy is within 20 8 mV f Test all channels Repeat substeps a through e for all channels 3 Disconnect the hookup a Set the generator output to 0 V b Then disconnect the cable from the generator output at the input connector of the channel last tested Check Analog Bandwidth Equipment One sine wave generator Item 11 Required One level meter and power sensor Item 12 One power splitter Item 13 One Female N to Male BNC Adapter Item 16 Four Male N to Female BNC Adapters Item 15 Two 50 Q precision cables Item 5 Two 10X attenuators Item 1 Prerequisites See page 4 15 l Install the test hookup and preset the instrument controls a Initialize the oscilloscope W Press save recall SETUP Then press the main m
99. NC R453 Oscilloscope V LIN R462 H PHASE 463 H SYNC R473 BRITE R482 VID GAIN R483 Front of the Oscilloscope Figure 5 11 Monitor Adjustment Locations 4 Adjust the display contrast a Display the White Box test pattern W Press the center main menu button to display the main menu Press the main menu button Tests Repeatedly press the side menu button more until White Box appears in the side menu Push White Box W Press the main menu button EXECUTE Then press the side menu button Ok Confirm Run Test TDS 420A TDS 430A amp TDS 460A Service Manual 5 23 Adjustment Procedures 5 24 Figure 5 12 Five and Ten Percent Luminance Patches b Make the contrast adjustment Locate R483 VID GAIN on the A26 Monitor assembly see Figure 5 11 Monitor the luminance at center screen using a J17 photometer and a luminance probe Adjust R483 VID GAIN for a reading of 100 foot lamberts 343 candelas If 483 needed a large adjustment perform the brightness adjust ment again 5 Adjust the display focus a Display the Composite test pattern Press the center main menu button to display the main menu Press the main menu button Tests Repeatedly press the side menu button more until Composite appears in the side menu Push Composite Press the main menu button EXECUTE Then press the side menu button Ok Confirm Run Test TDS 420A TDS 430A
100. OMER FOR BREACH OF THIS WARRANTY TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES Contacting Tektronix Phone 1 800 833 9200 Address Tektronix Inc Department or name if known 14200 SW Karl Braun Drive P O Box 500 Beaverton OR 97077 USA Web site www tektronix com Sales support 1 800 833 9200 select option 1 Service support 1 800 833 9200 select option 2 Technical support Email techsupport tektronix com 1 800 833 9200 select option 3 1 503 627 2400 6 00 a m 5 00 p m Pacific time This phone number is toll free in North America After office hours please leave a voice mail message Outside North America contact a Tektronix sales office or distributor see the Tektronix web site for a list of offices EN i Table of Contents Specifications Operating Information Theory of Operation List of Fig res 55 2052 22 74 44 ORE Ro y acer Re Eistof Tables 12 1 e v REESE Ye eh General Safety Summary Service Safety Summary CES Introduction Before Servicing ei venio Ede Wee Uii Strategy for ServICIDg osuere aide ath er eere
101. Oscilloscope Loco Figure 4 3 Universal Test Hookup for Functional Tests a Hook up the signal source Install the probe on CH 1 Connect the probe tip to PROBE ADJ on the front panel leave the probe ground unconnected TDS 420A TDS 430A amp TDS 460A Service Manual Brief Procedures b Initialize the oscilloscope Press save recall SETUP Press the main menu button Recall Factory Setup Press the side menu button OK Confirm Factory Init 2 Verify that all input channels operate Do the following substeps test CH 1 first skipping substep a since CH 1 is already set up for verification from step 1 a Select an unverified channel m Press WAVEFORM OFF to remove from display the channel just verified W Press the front panel button that corresponds to the channel you are to verify Move the probe to the channel you selected b Setup the selected channel W Press AUTOSET to obtain a viewable triggered display in the selected channel m Set the vertical SCALE to 100 mV Use the vertical POSITION knob to center the waveform vertically on screen Set the horizontal SCALE to 200 us W Press TRIGGER MENU W Press the main menu button Coupling then press the side menu button HF Rej c Verify that the channel is operational Confirm that the following statements are true m The vertical scale readout for the channel under test shows a setting of 100 mV and a square wave probe compens
102. Power Factor Correction module in the locator diagram Internal Modules Figure 6 3 on page 6 19 3 Orient the digitizing oscilloscope Position the digitizing oscilloscope with the top resting on the work surface and the rear panel facing you 4 Remove the Power Factor Correction Module a Remove the four screws that secure the module bracket to the rear subpanel b Remove the two screws that attach the new air baffle shield Locate the screws in Figure 6 22 One screw is down in the chassis at the inner edge of the PFC module and the other is up on the edge of the chassis c Remove the new air baffle shield d Remove the securing hardware from the inner edge of the module mounting bracket one screw and one hex spacer post See Figure 6 22 for hardware locations Do not remove the inner two screws These two screws secure the circuit board to the mounting bracket TDS 420A TDS 430A amp TDS 460A Service Manual 6 55 Removal and Installation Procedures Power Factor Correction module Air baffle shield EA P3 Hex spacer post Black and red connector Flex cable two connector fv line trigger Do not remove these screws Mounting Screw 4 Figure 6 22 Power factor correction module removal B080000 amp up e Disconnect P3 connector located on the low voltage power supply board f Disconnect the remaining two conductor black and red connector located on low vol
103. Procedures Equipment Required The test equipment required to adjust the TDS 420A TDS 430A and TDS 460A Digitizing Oscilloscopes is listed in Table 5 3 Table 5 3 Test Equipment Fixtures and Supplies Item Number and Description 1 Computer System 2 Adapter BNC female to BNC female 3 Adapter Probe Tip to BNC 50 Q termination 4 Adjustment Tool 5 Attenuator 10X two required 6 Attenuator 2X Minimum Requirements See description under System on page 5 2 for minimum and recommended requirements Tektronix part number 013 0028 00 Tektronix part number 013 0227 00 0 1 inch hex wrench on both ends Ratio 10X impedance 50 2 connectors female BNC input male BNC output Ratio 2X impedance 50 connectors female BNC input male BNC output Example Standard PC see description under System on page 5 2 Tektronix part number 013 0028 00 Tektronix part number 013 0227 00 GC Electronics 8606 Tektronix part number 011 0059 02 Tektronix part number 011 0069 02 Purpose Software based adjustments Probe adjustment Probe adjustment A26 Monitor adjustment Software based adjustments and probe adjustments Software based adjustments 7 Cable GPIB IEEE Std 488 1 1987 Tektronix part number Software based adjustments IEEE Std 488 2 1987 002 0991 01 8 Cable Precision Coaxial 50 36 in male to male BNC Tektronix part number Software based adjustments
104. S 11866 SLATER AVE NE 77 DRAGON COURT 6136 NE 87TH AVE PO BOX 20038 2040 15TH AVE WEST 2100 EARLYWOOD DR PO BOX 547 EXIT 53 RT 80 BOXA 1055 OBRIAN DR TDS 420A TDS 430A amp TDS 460A Service Manual City State Zip Code SUMMERSET NJ 08873 BERKELEY CA 94170 TOKYO JAPAN CHICAGO IL 60609 3320 PORTLAND OR 97224 TIGARD OR 97223 LIVONIA MI 48150 1303 TACOMA WA 98409 SAN JOSE CA 95112 VANCOUVER WA 98682 SAN JOSE CA 95110 TAIPEI TAIWAN ROC VANCOUVER WA 98661 PORTLAND OR 97214 4657 HILLSBORO OR 97124 6474 TORRANCE CA 90503 2489 TIGARD OR 97224 BREA CA 92631 BEAVERTON OR 97005 VANCOUVER WA 98661 2999 HARRISBURG PA 17105 LOS ANGELES CA 90039 2410 KIRKLAND WA 98034 WOBURN MA 01801 1039 PORTLAND OR 97220 SEATTLE WA 98119 2728 FRANKLIN IN 46131 DELAWARE WATER GAP PA 18327 MENLO PARK CA 94025 1408 10 3 Mfr CROSS INDEX MFR CODE NUMBER TO MANUFACTURER Code Manufacturer Address City State Zip Code 61857 SAN 0 INDUSTRIAL CORP 85 ORVILLE DR BOHEMIA LONG ISLAND NY 11716 2501 PO BOX 511 70903 COOPER BELDEN ELECTRONICS WIRE AND CABLE SUB OF COOPER INDUSTRIES INC 80009 TEKTRONIX INC 14150 SW KARL BRAUN DR BEAVERTON OR 97077 0001 PO BOX 500 50356 TEAC AMERICA INC 7733 TELEGRAPH RD MONTEBELLO CA 90640 6537 PO BOX 750 50463 POWER SYSTEMS INC 45 GRIFIN ROAD SOUTH LINFIELD CT 06002 060D9 TENSOLITE COMPANY PRECISION HARNESS AND ASSEMBLY VANCOUVER WA 98661 3000 COLUMBIA HOUSE BLVD
105. Service Manual Tektronix TDS 420A TDS 430A amp TDS 460A Digitizing Oscilloscopes 070 9703 06 This document applies to instruments with serial numbers B050000 and above Warning The servicing instructions are for use by qualified personnel only To avoid personal injury do not perform any servicing unless you are qualified to do so Refer to all safety summaries prior to performing service www tektronix com Copyright Tektronix Inc rights reserved Tektronix products are covered by U S and foreign patents issued and pending Information in this publication supercedes that in all previously published material Specifications and price change privileges reserved Tektronix Inc P O Box 500 Beaverton OR 97077 TEKTRONIX and are registered trademarks of Tektronix Inc WARRANTY Tektronix warrants that the products that it manufactures and sells will be free from defects in materials and workmanship for a period of three 3 years from the date of shipment If a product proves defective during this warranty period Tektronix at its option either will repair the defective product without charge for parts and labor or will provide a replacement in exchange for the defective product In order to obtain service under this warranty Customer must notify Tektronix of the defect before the expiration of the warranty period and make suitable arrangements for the performance of service Customer shall be respo
106. Shafts Drive 6 16 TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures Table 6 6 Access Instructions for Modules in Figure 6 3 Page No 6 39 Procedure Including Module to be Removed 1 05 Attenuator Assembly and Shield 2 26 Monitor Assembly 3 X A08 Jumper Board Assembly D1 Bus and Board Supports 4 A08 CPU Assembly 6 41 6 44 5 A02 Display Assembly 6 09 DSP Assembly 7 01 Backplane Assembly and its Mount 6 50 Access Instructions 1 Do Trim Ring Menu Elastomer Menu Buttons and Front EMI Gaskets page 6 31 Do A08 Jumper Board Assembly D1 Bus and Board Supports listed as procedure number 3 in this table Remove only the A08 jumper board assembly Do A06 Front Panel Assembly ESD Shield and Menu Flex and Probe Code Flex Circuits page 6 35 Do not remove the menu flex circuit Do the procedure listed at left to remove the module Do the procedure listed at left to remove the module Do the procedure listed at left to remove the module Do A08 Jumper Board Assembly D1 Bus and Board Supports removing only the board supports Do the procedure listed at left to remove the module Do A08 Jumper Board Assembly D1 Bus and Board Supports Do not remove the A08 jumper board assembly Do the procedure listed at left to remove the module Do A08 Jumper Board Assembly D1 Bus and Board Supports Do not remove the A08 jumper board assembly
107. TDS 420A TDS 430A amp TDS 460A Service Manual Nominal Traits Table 1 9 Nominal Traits Mechanical Name Cooling Method Construction Material Finish Type Weight Description Forced air circulation with no air filter Chassis parts constructed of aluminum alloy front panel constructed of plastic laminate circuit boards constructed of glass laminate Plastic parts are polycarbonate Tektronix Blue textured vinyl finish on aluminum cabinet Standard digitizing oscilloscope 9 8 kg 21 6 lbs oscilloscope only 11 4 kg 25 1 Ibs with front cover accessories and accessories pouch installed 15 7 kg 34 6 lbs when packaged for domestic shipment 225 grams 0 5 lbs Floppy Disk Drive only Rackmount digitizing oscilloscope 9 4 kg 20 6 Ibs plus the weight of rackmount parts for the rackmounted digitizing oscilloscope Option 1R 17 5 kg 38 6 lbs when the rackmounted digitizing oscilloscope is packaged for domestic shipment Rackmount conversion kit 4 5 kg 10 0 Ibs parts only 7 9 kg 17 5 Ibs parts plus package for domestic shipping TDS 420A TDS 430A amp TDS 460A Service Manual 1 11 Nominal Traits Table 1 9 Nominal Traits Mechanical Cont Name Description Overall Dimensions Standard digitizing oscilloscope Height 191 mm 7 5 in when feet and accessories pouch are installed 165 mm 6 5 in without the accessories pouch installed Width 381 mm 15 in with handle Depth 471 m
108. TION 77 ACQUIRE MENU CO VERTICAL E HORIZONTAL EI TRIGGER Z POSITION Position gt MAIN LEVEL OCH3 57 ea I mm C 2 DELAYED TRIG OCH4 VERTICAL HORIZONTAL TRIGGER MENU MENU MENU OMORE WC 4 scale gt SET LEVEL TRIGID p SN WAVEFORM OFF SINGLE TRIGGERO ARM 6 C2 FORCE TRIGGER 300 V CAT IL 1 5 500 CH 2 54V pk SVRMS Y PROBE COMP On CH 1 a Input waveforms into these channels 7 Example CH 1 b Push channel button 8 to display its waveform The last channel selected determines which waveform is positioned and scaled The indicator above the channel last selected is lighted Example Push 1 then CH 2 c Vertically 1 and horizontally 2 scale and position the waveform s selected Example Set the scale to 100 mV div and center the waveform screen d Stop and start acquiring waveforms 3 Example Push RUN STOP if not acquiring TDS 420A TDS 430A amp TDS 460A Service Manual Operating Information e Adjust trigger level 5 to trigger the waveform s selected or use these buttons 6 to either set a trigger level at the mid amplitude level of the selected waveform or to force a single trigger Example Push SET LEVEL TO 50 3 Set all other functions using menus a b Choose the waveform source 8 first
109. TK0435 TK0860 1163 1891 1908 1918 1935 2058 2432 06009 0 01 0 05 26003 1163 2478 0DWW6 0JR05 00779 07416 1JJ96 18565 2 262 22670 24931 30817 34416 CROSS INDEX CODE NUMBER MANUFACTURER Manufacturer FELLER SCHURTER AG H C O PANEL COMPONENTS CORP JAPAN SERVO CO LTD LEWIS SCREW CO LABEL GRAPHICS POLYCAST INC PRESTOLE CORP PLASTIC MOLDED PRODUCTS SHIN ETSU POLYMER AMERICA INC ACCRA FAB INC TDK CORPORATION OF AMERICA UNION ELECTRIC UNITREK CORPORATION STAUFFER SUPPLY CO NORTH STAR NAMEPLATE INC MARTEK POWER MDI POLYCAST INC GRIMES COMPANY MICRO POWER ELECTRONICS TRIQUEST CORP AMP INC NELSON NAME PLATE CO KAM ELECTRIC CO CHOMERICS INC BOYD CORP G M NAMEPLATE INC SPECIALTY CONNECTOR CO INC INSTRUMENT SPECIALTIES CO INC PARSONS MFG CORP Address 72 VERONICA AVE UNIT 4 2015 SECOND STREET 7 KANDA MITOSHIRO CHO CHIYODA KU 4300 S RACINE AVE 6700 SW BRADBURY CT 9898 SW TIGARD ST 34589 GLENDALE ST 4336 SO ADAMS 1181 NORTH 4TH ST 11007 NE 37TH CIRCLE 2055 GATEWAY PLACE SUITE 200 15 F 1 FU SHING N ROAD 3000 COLUMBIA HOUSE BLVD SUITE 1 20 810 SE SHERMAN LABEL PRODUCTS 5750 NE MOORE COURT 4115 SPENCER STREET 14140 SW 72ND AVE SUITE 100 115 S AROVISTA CIRCLE 7973 SW CIRRUS DRIVE BLDG 22 3000 LEWIS AND CLARK HWY 2800 FULLING MILL PO BOX 3608 3191 CASITA
110. Voltage High Low 7 15 1 V 15 15 V 14 9 V 10 6 V 6 6 V 6 0 V 14 6 4 V 6 0 V 6 5 V 16 15 V 115 3 V 14 7 V 17 15V 147 V 15 3 6 96 TDS 420A TDS 430A amp TDS 460A Service Manual Troubleshooting Table 6 16 A04 Acquisition Board Power J7 Voltage High Low 9 15V 14 7 V 15 3 12 6 4 V 6 0 V 6 6 V 16 5 V 5 15 V 4 9 V 19 15 V 115 3 V 14 7 V Ww HH og Hra Ww Lx E AE 5 all p arcu 8 8 B d 8 B d 9 g 9 g n 9 g q Ol E 4 9 d E E B d 9 9 B 8 8 B d 8 d 9 5 ES 8 BH E E i 3 E E E E d 9 9 E 8 8 B Cd 8 T 3 d 9 e sua ua ua ua ua B g 3 8 8 8 g g ee eeu Sa B d B d 8 8 B 5 g 8 E B d B d B dg 8 8 B d B d B d o8 8 8 B d B d 8 8 B d B d Em B S 8 8 8 B d B d 8 8 E 8 IZ B d B4 XH 3 cM S S EN S S S S sS S S S 8 S 8 S a a a a a 2 a a zz ES S S M S 8 E S S 8 8 S DO S Be 8 S S S8 a a a a a 2 oa a
111. a 9 to 25 Pin Null Modem Cable Table 6 10 Diagnostic Failure Priority Lists Table 6 11 Normal Output Voltage Table 6 12 Power Supply Maximum Current Table 6 13 Front Panel Connector Voltages Table 6 14 Channel and P1 Signal Locations Table 6 15 A05 Attenuator Board Power Table 6 16 A04 Acquisition Board Power Table 6 17 Regulator Voltages Table 6 18 J7 Voltages iier ee hh mre heh hem Table 6 19 J8 Front Panel Voltages Table 7 1 International Power Cords Table 7 2 Standard Accessories Table 7 3 Optional Accessories Table 7 4 Compatible Probes Table 7 5 Accessory Software 5 7 6 3 6 5 6 6 6 12 6 15 6 17 6 20 6 77 6 78 6 83 6 85 6 87 6 93 6 95 6 96 6 97 6 99 6 99 6 99 7 2 7 2 7 3 7 3 7 5 TDS 420A TDS 430A amp TDS 460A Service Manual General Safety Summary Injury Precautions Product Damage Precautions Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it To avoid potential hazards use this product only as specified Only qualified personne
112. a measurements that is measurements based on the difference between two cursors You can use both V Bar and H Bar cursors to make absolute measurements measurements relative to a defined level or event In the case of the H Bars either cursor can be selected to read out its voltage with respect to the ground reference level of any channel in the case of the V Bars its time with respect to the trigger point event of the acquisition For time measurements units can be either base seconds or clocks or inverse base Hertz or 1 clocks Measure can automatically extract parameters from the signal input to the digitizing oscilloscope Any four out of the more than 20 parameters available can be displayed on the screen The displayed parameters are extracted continu ously and the results updated on screen as the digitizing oscilloscope continues to acquire waveforms TDS 420A TDS 430A amp TDS 460A Service Manual 1 5 Product Description Storage 0 Display 1 6 TDS 400A Digitizing Oscilloscopes can save acquired waveforms in any of four nonvolatile REF reference memories You can save any input channel waveform to any REF memory or you can move a stored reference from one REF memory to another You can display any or all of the saved waveforms for comparison with the waveforms being currently acquired TDS 400A Digitizing Oscilloscopes are fully controllable and capable of sending and receiving waveforms over the GPI
113. ackplane to Acquisition cable Dsy A02 Display Attn Cable Backplane to Attenuator cable Attn A05 Attenuator Jumper Board A08 Jumper Acq A04 Acquisition Front Panel cables Backplane to Front Panel and CPU to Front Panel Backplane A01 Backplane Fp A06 Front Panel Is the selected module Is the Is the the A05 Attenuator No selected module the No selected module No A04 Acquisition or the A06 Front Panel board the A01 Backplane 08 Jumper board Yes Yes Yes Perform the Attenuator Acquisition and Acquisition and Attenuator Power troubleshooting procedures Perform the Processor Front Panel troubleshooting procedure Perform the Backplane troubleshooting procedure Using the troubleshooting procedure did you find a faulty module Using the troubleshooting procedures did you find a faulty module Using the troubleshooting procedures did you find a faulty module Yes E oe Yes No Replace the module Run all extended diagnostics Does the display report any errors Select the next module from Table 6 10 No Select the next module from Table 6 10 Figure 6 33 Module Isolation Troubleshooting Procedure 6 82 TDS 420A TDS 430A amp TDS 460A Service Manual Troubleshooting Table 6 10 Diagnostic Failure Priority Lists Module Cpu Cal Initialization Cpu Dsp or AT bus Dsp Cpu Ds
114. al service or adjustments of this product unless another person capable of rendering first aid and resuscitation is present Disconnect Power To avoid electric shock disconnect the main power by means of the power cord or if provided the power switch Use Caution When Servicing the CRT To avoid electric shock or injury use extreme caution when handling the CRT Only qualified personnel familiar with CRT servicing procedures and precautions should remove or install the CRT CRIs retain hazardous voltages for long periods of time after power is turned off Before attempting any servicing discharge the CRT by shorting the anode to chassis ground When discharging the CRT connect the discharge path to ground and then the anode Rough handling may cause the CRT to implode Do not nick or scratch the glass or subject it to undue pressure when removing or installing it When handling the CRT wear safety goggles and heavy gloves for protection Use Care When Servicing With Power On Dangerous voltages or currents may exist in this product Disconnect power remove battery if applicable and disconnect test leads before removing protective panels soldering or replacing components To avoid electric shock do not touch exposed connections X Radiation To avoid x radiation exposure do not modify or otherwise alter the high voltage circuitry or the CRT enclosure X ray emissions generated within this product have been sufficiently shielded
115. ame Accuracy Long Term Sample Rate and Delay Time Accuracy Absolute Time and Delay Time Measurements Description 150 ppm over any 1 ms interval For single shot acquisitions using sample or high resolution acquisition modes and a bandwidth limit setting of 100 MHz 1 WI 150 ppm of Reading 450 ps For single shot acquisitions using sample or high resolution acquisition modes and a bandwidth limit setting of 20 MHz 1 WI 150 ppm of Reading 1 3 ns For repetitive acquisitions using average acquisition mode with 8 averages and a bandwidth limit setting of FULL 1 WI 150 ppm of Reading 200 ps Accuracy Delta Time Measurement 2 For single shot acquisitions using sample or high resolution acquisition modes and a bandwidth limit setting of 100 MHz 1 WI 150 ppm of Reading 650 ps For repetitive acquisitions using average acquisition mode with 8 averages and a bandwidth limit setting of FULL 1 WI 150 ppm of Reading 300 ps 1 For input signals gt 5 divisions in amplitude and a slew rate of 2 0 divisions ns at the delta time measurement points Signal must have been acquired at a volts division setting 5 mV division and not in Events mode The WI waveform interval is the time between the samples in the waveform record Also see the footnotes for Sample Rate Range and Equivalent Time or Interpolated Waveform Rates in Table 1 4 on page 1 9 TDS 420A TDS 430A
116. amine up close By using ZOOM you can magnify the waveform parameter using the vertical and horizontal controls to expand or contract and position it for viewing TDS 420A TDS 430A amp TDS 460A Service Manual MEM CUI UU Nominal Traits Nominal traits are described using simple statements of fact such as Four all identical for the trait Input Channels Number of rather than in terms of limits that are performance requirements Table 1 3 Nominal Traits Signal Acquisition System Name Bandwidth Selections Digitizers Number of Digitized Bits Number of Digitized Resolution Hi Res Mode Bandwidth Hi Res Mode Description 20 MHz 100 MHz and FULL TDS 420A 200 MHz TDS 430A and TDS 460A 400 MHz TDS 430A Two both identical TDS 420A and TDS 460A Four all identical 8 bits Clock Internal Resolution ines I 8 05 a lt 15bits 100 000 000 ClockExternalMenu Clock External Resolution pires lt 11 8 bits I 8 lt 0 5 Clock Internal j 50 For 1us div and slower 0 44 x Hz Clock External 44 uz Input Channels Number of TDS 430A Two both identical called CH 1 and CH 2 TDS 420A and TDS 4604 Four all identical called CH 1 through CH 4 Input Coupling DC AC or GND Input Resistance Selections 1 MQ or 50 Q Ranges Offset All Channels Volts Div S
117. ample Trigger Level 20mV Level Set to TTL Set to ECL Set to 50 1 00 V M3 00us Chif 20mV Source Coupling Slope Level pom d amp Edge chi DC 20mv Holdoff 21 a Pushing some main menu buttons displays a side menu with labels containing readouts that you can vary Example Push Level 21 b Pushing the side menu button assigns the knob to control the readout appearing in the button label It also copies the readout to the general purpose knob readout area in the right corner of the screen Example Push Level 19 c Use the general purpose knob 20 to adjust the trigger level to the setting desired Example Turn the knob to 20 mV TDS 420A TDS 430A amp TDS 460A Service Manual 2 13 Operating Information More About the General Purpose Knob As you have just seen the general purpose knob is used to extend the number of choices available to a side menu button You can also assign the general purpose knob to control additional functions Some of these additional functions include Cursor positioning Display intensities Delay time Number of events Trigger position Holdoff Offset Variable persistence File system In all cases the menus are used to select the function to which the general purpose knob is assigned The following attributes apply to this knob Depending on the function
118. appear in boldface type under Warranted Characteristics in Chapter 1 You can use the form at the end of this section as a test record The procedures are arranged in four logical groupings Signal Acquisition System Checks Time Base System Checks Triggering System Checks and Output Ports Checks They check all the characteristics that are designated as checked in Chapter 1 Specifications The characteristics that are checked appear in boldface type under Warranted Characteristics in Chapter 1 You can use the form at the end of this section as a test record Read Performance Verification Procedures that start on page NO TAG Also if you are not familiar with operating this digitizing oscilloscope read Operating Information in Chapter 2 of the service manual or read the user manual before doing any of these procedures STOP These procedures extend the confidence level provided by the basic procedures described on page 4 5 The basic procedures should be done first and then these procedures performed if desired The tests in this chapter comprise an extensive valid confirmation of perfor mance and functionality when the following requirements are met m The cabinet must be installed on the digitizing oscilloscope You must have performed and passed the procedures under Self Tests found on page 4 5 and those under Functional Tests found on page 4 7 Asignal path compensation must have been done within the recommende
119. aration 6 2 A Preventing ESD m Chapter 5 Adjustment Procedures addresses after repair adjustment and the interval between periodic adjustments It contains a procedure for adjusting the internal circuits of the oscilloscope W Chapter 9 Diagrams contains a block diagram using individual modules as blocks and an interconnection diagram showing connections between the modules m Chapter 10 Mechanical Parts List lists all field replaceable modules by part number This section gives general information on preventing damage to internal modules when doing maintenance CAUTION Static discharge can damage any semiconductor component in this oscilloscope When performing any service which requires internal access to the oscilloscope adhere to the following precautions to avoid damaging internal modules and their components due to electrostatic discharge ESD 1 Minimize handling of static sensitive modules 2 Transport and store static sensitive modules in their static protected containers Label any package that contains static sensitive modules 3 Discharge the static voltage from your body by wearing a grounded antistatic wrist strap while handling these modules Do service of static sensitive modules only at a static free work station 4 Do not remove the oscilloscope cabinet unless you have met precaution number 3 above Consider all internal modules static sensitive 5 Nothing capable of generating or ho
120. assembly TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures A26 Monitor Assembly EMI Clip EL 52 7 65 72 Figure 6 15 A26 Monitor assembly removal 6 43 TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures A08 Jumper Board 1 Assembly D1 Bus and Board Supports Locate the modules to be removed Find the modules to be removed in the locator diagram Internal Modules Figure 6 3 on page 6 19 or in Figure 6 4 on page 6 22 Orient the digitizing oscilloscope Set the digitizing oscilloscope so its left side is down with its front facing to the left of you Remove the board supports Depress the snap lock at the bottom end of the board support and tilt the support outwards to remove from the chassis Repeat for the second and third board supports See Figure 6 16 Remove the D1 Bus Grasp the D1 bus by its cable pull tab and pull to unplug it from J1 of the Display assembly Then grasp the cable and pull to unplug it from J3 of the acquisition assembly and J2 of the DSP assembly See Figure 6 16 Remove the jumper board assembly Grasp the jumper board assembly by opposite edges and pull out to unplug it from J102 of the attenuator assembly and J9 of the acquisition assembly Take care to pull the jumper board straight out with a minimum of rocking motion See Figure 6 16
121. assembly of the oscilloscope for cleaning Troubleshooting Information for isolating failed modules Included are instructions for operating the internal diagnostic routines and troubleshooting trees Most of the trees make use of these internal diagnostic routines to speed fault isolation to a module Service personnel must be prepared to safely service the oscilloscope This manual is for qualified service personnel only Read the General Safety Summary and the Service Safety Summary at the front of this manual If you are unfamiliar with the operation of this oscilloscope read Operating Information Chapter 2 before servicing the oscilloscope To prevent electro static damage ESD read Preventing ESD on page 6 2 before servicing the oscilloscope Related Maintenance Procedures The following chapters contain information and procedures related to doing maintenance Chapter 2 Operating Information covers instructions useful when operating the oscilloscope in order to troubleshoot it chapter also details the service strategy and lists options for obtaining maintenance service and for replacing failed modules Chapter 3 Theory of Operation contains a circuit description at the module or block level Chapter 4 Performance Verification contains procedures that are useful in isolating problems to modules by testing oscilloscope performance TDS 420A TDS 430A amp TDS 460A Service Manual 6 1 Maintenance Prep
122. at bladed spudger Item 11 and a soldering iron Item 12 Familiarize yourself with the modules illustrated in Figures 6 2 6 3 and 6 4 on pages 6 16 6 19 and 6 22 respectively 2 Remove all modules Do in the order listed the following procedures They are found under Procedures for Module Removal and Installation which starts on page 6 23 a b Line Fuse and Line Cord page 6 26 Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet page 6 27 Disk Drive page 6 34 Trim Ring Menu Elastomer Menu Buttons and Front EMI Gaskets page 6 31 A06 Front Panel Assembly ESD Shield and Menu Flex and Probe Code Flex Circuits page 6 35 Fan and Fan Mount page 6 63 g A25 Low Voltage Power Supply and its Mount page 6 57 A26 Monitor Assembly page 6 41 A07 Auxiliary Power Supply B010100 B079999 page 6 67 Line Filter page 6 65 TDS 420A TDS 430A amp TDS 460A Service Manual 6 71 Removal and Installation Procedures 6 72 k A08 Jumper Board Assembly D1 Bus and Board Supports page 6 44 1 A03 CPU Assembly page 6 45 m A02 Display Assembly page 6 47 n A09 DSP Assembly page 6 48 o A01 Backplane Assembly and its Mount page 6 50 p Back up Batteries page 6 53 q A05 Attenuator Assembly and Shield page 6 39 r A04 Acquisition Assembly page 6 69 Reassembly Do substeps a r in the order listed Observe the following instructions as you do them
123. ation signal about five divisions in amplitude is on screen See Figure 4 1 on page 4 3 to locate the readout m The vertical POSITION knob moves the signal up and down the screen when rotated m Turning the vertical SCALE knob counterclockwise decreases the amplitude of the waveform on screen turning the knob clockwise increases the amplitude and returning the knob to 100 mV returns the amplitude to about five divisions TDS 420A TDS 430A amp TDS 460A Service Manual 4 9 Brief Procedures d Verify that the channel acquires in all acquisition modes Press SHIFT then press ACQUIRE MENU Use the side menu to select in turn each of the five hardware acquire modes and confirm that the following statements are true Refer to the icons at the left of each statement as you confirm those statements m Sample mode displays an actively acquiring waveform on screen Note that there is noise present on the peaks of the square wave m Peak Detect mode displays an actively acquiring waveform on screen with the noise present in Sample mode peak detected m Res mode displays an actively acquiring waveform on screen with the noise that was present in Sample mode reduced 47 m Envelope mode displays an actively acquiring waveform on screen with the noise displayed W Average mode displays an actively acquiring waveform on screen with the noise reduced like in Hi Res mode e Test all channels Repeat
124. ave at CH 1 and reconnect it to CH 1 through a 5X attenuator d Repeat step 2 substeps b and c only 4 Confirm that the Main and Delayed trigger systems couple trigger signals from all channels Doing the procedure Check Analog Bandwidth which begins on page 4 25 checks coupling If you have not done that procedure do so after finishing this procedure See the following note NOTE Steps 1 through 3 confirmed trigger sensitivity for the Main and Delayed triggering systems using the CH 1 input Doing the procedure Check Analog Bandwidth ensures that trigger signals are coupled from all channels 5 Disconnect the hookup Disconnect the cable from the generator output at the input connector of the channel last tested Maximum Input Equipment One sine wave generator Item 11 Frequency Auxiliary Required Trigger Two precision 50 Q coaxial cables Item 5 One BNC T connector Item 8 Prerequisites See page 4 15 l Install the test hookup and preset the oscilloscope controls a Initialize the oscilloscope Press save recall SETUP 4 44 TDS 420A TDS 430A amp TDS 460A Service Manual Performance Tests Press the main menu button Recall Factory Setup W Press the side menu button OK Confirm Factory Init b Modify the initialized front panel control settings m Set the vertical SCALE to 1 volt set the horizontal SCALE to 20 ns W Press VERTICAL MENU Press the main menu button Coupl
125. ave recall SETUP m Press the main menu button Recall Factory Setup Press the side menu button OK Confirm Factory Init TDS 420A TDS 430A amp TDS 460A Service Manual 5 13 Adjustment Procedures 5 14 Modify the initialized front panel control settings Press Autoset Set the vertical SCALE to 100 mV Set the horizontal SCALE to 100 ns If you use a reference frequency other than 10 MEZ set the horizontal SCALE to display 5 to 7 cycles of the waveform Press SHIFT Then press ACQUIRE MENU Press the main menu button Mode Then press the side menu button Hi Res Press MEASURE Press the main menu button Hi Low Setup Then press the side menu button Min Max Press the main menu button Select Measurement for Chl Repeatedly press the side menu button more until Pk Pk appears in the side menu Press the side menu button Pk Pk Press CLEAR MENU 2 Confirm probe bandwidth a Display and measure the test signal Monitor the CH 1 Pk Pk readout while you set the output of the generator for a 600 mV 6 division 10 MHz or less reference signal TDS 420A Only Set the horizontal SCALE to 2 ns and set the frequency of the generator to 200 MHz TDS 430A and TDS 460A Only Set the horizontal SCALE to 1 ns and set the frequency of the generator to 400 MHz Read the measurement results at the CH 1 Pk Pk readout on screen b Check against limits CHECK that the CH 1 Pk Pk readout is greater than or eq
126. ble display range TDS 420A TDS 430A amp TDS 460A Service Manual 5 21 Adjustment Procedures 3 Adjust the display brightness a Display the Circle test pattern Switch No Open Closed Disconnect the power plug from the oscilloscope Set the DIP switch S1 located near the front of the A03 CPU board as follows Reconnect the power plug to the oscilloscope For instrument serial numbers B079999 and below reconnect the power plug and ensure the power switch is in the on position Allow 15 to 20 minutes for the oscilloscope to warm up Press SHIFT and UTILITY Repeatedly press the main menu button System until Diag Err is highlighted in the pop up menu Repeatedly press the main menu button Area until Display is highlighted in the pop up menu Repeatedly press the side menu button more until Circle appears in the side menu Push Circle Press the main menu button EXECUTE Then press the side menu button Ok Confirm Run Test b Make the brightness adjustment 5 22 Locate R482 BRITE see Figure 5 11 Adjust R482 until the background raster lines in the 576 luminance patch see Figure 5 12 on page 5 24 disappear while the lines in the 10 luminance patch are visible TDS 420A TDS 430A amp TDS 460A Service Manual Adjustment Procedures lt L400 E SIZE 1310 FOCUS R411 V POS R445 V SIZE R452 Left Side of the V SY
127. button Save To Selected File TDS 420A TDS 430A amp TDS 460A Service Manual 4 13 Brief Procedures Set the horizontal SCALE to 500 us and then use the vertical POSI TION knob to place the channel 1 baseline trace two divisions above center screen Press the main menu button Recall Saved Setup then press the side menu button From File Turn the general purpose knob to select the file to recall For example if you followed the instructions above and used a blank disk you had the digitizing oscilloscope assign the name TEK00000 SET to your file Press the side menu button Recall From Selected File Verify that the digitizing oscilloscope retrieved the saved setup from the disk Do this by noting that the horizontal SCALE again reads 200 us and the channel 1 baseline waveform is again vertically positioned near center screens as when you saved the setup 3 Remove the test hookup Remove the disk from the disk drive REV DEC 93 TDS 420A TDS 430A amp TDS 460A Service Manual SY A Performance Tests Prerequisites This section contains procedures for checking that the TDS 400A Digitizing Oscilloscopes perform as warranted The procedures are arranged in four logical groupings Signal Acquisition System Checks Time Base System Checks Triggering System Checks and Output Ports Checks They check all the characteristics that are designated as checked in Chapter 1 Specifications The characteristics that are checked
128. cedures Push up on the left top tab lock on the trim ring and pull the left corner of the trim ring forward slightly The left top tab lock is shown in Figure 6 9 on page 6 31 Tilt the rear of the monitor assembly upward slightly Slide the monitor assembly back in the main chassis until it stops about 24 inch Now lift it straight up out of the the top of the main chassis to complete the removal While heeding the WARNING on monitor handling that immediately precedes step 4 of this monitor removal procedure store the monitor assembly in a protected location Place it face down on a soft nonabra sive surface to prevent scratching the face plate 5 Reinstallation a 6 42 Perform in reverse order 4a 4f reversing the removal instructions in each step and substep to reinstall the assembly If the EMI clips on the monitor are replaced be sure to center them in the notched area of the top and bottom of the chassis See the following procedures in the order listed to replace modules removed by the access procedure m A06 Front Panel Assembly ESD Shield and Menu Flex and Probe Code Flex Circuits on page 6 35 m Trim Ring Menu Elastomer Menu Buttons and Front EMI Gaskets on page 6 31 Wm Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet page 6 27 to reinstall the cabinet and rear cover m Line Fuse and Line Cord page 6 26 to reinstall the line cord which completes the oscilloscope re
129. channel you are to confirm Press MEASURE Press the main menu button Select Measurement for CHx then press the side menu button Mean You will have to press MORE several times to access the Mean measurement TDS 420A TDS 430A amp TDS 460A Service Manual 4 21 Performance Tests Check DC Voltage Measurement Accuracy 4 22 Averaged Table 4 2 DC Offset Accuracy Vertical Scale S 1mV 100 mV 1V f Vertical Generator Offset etting Position Offset Setting Setting Accuracy Limits 0 1V 1V 5 mV 0 10 V 10 V 65 mV 0 99 9 V 99 9 V 649 5 mV Set the vertical scale Set the vertical SCALE to one of the settings listed in Table 4 2 that is not yet checked Start with the first setting listed Set the offset Press the VERTICAL MENU button and then the Offset main menu button Using the General Purpose knob set the offset as dictated by Table 4 2 Start with the first setting listed Set the generator Set the DC calibration generator to match the vertical scale as dictated by Table 4 2 Start with the first setting listed Check against limits Do the following subparts in the order listed m Subtract the measured mean from the generator setting The result is the offset accuracy m CHECK that the offset accuracy is within the limits listed for the current vertical scale setting m Repeat substeps b through e until all vertical scale settings listed in Table 4 2 are checked for
130. circuit board rather than a component like a resistor or an integrated circuit Sometimes a single component is a module for example the chassis of the oscilloscope is a module Symbols and terms related to safety appear in the General Safety Summary and Service Safety Summary found at the beginning of this manual Besides the symbols related to safety this manual uses the following symbols STOP This stop sign labels information which you must read in order to correctly do service and to avoid incorrectly using or applying service procedures D The clock icon labels procedure steps which require a pause to wait for the oscilloscope to complete some operation before you can continue f Various icons such as the example icon at the left are used in procedures to help identify certain readouts and menu functions On screen TDS 420A TDS 430A amp TDS 460A Service Manual Preface Related Manuals These other manuals are available for the TDS 430A TDS 420A and TDS 460A Digitizing Oscilloscopes The Reference gives you a quick overview of how to operate your oscillo scope m The User Manual provides instructions on how to operate your oscilloscope m The Programmer Manual provides complete information on programming and remote control of the oscilloscope through the GPIB TDS 420A TDS 430A amp TDS 460A Service Manual XV Introduction Before Servicing Strategy for Servicing xvi This section co
131. ctions properly The only equipment required is one of the standard accessory probes and a 3 5 720 K or 1 44 Mbyte floppy disk TDS 420A TDS 430A amp TDS 460A Service Manual 4 7 Brief Procedures Verify All Input Channels 4 8 STOP These procedures verify functions that is they verify that oscilloscope features operate They do not verify that they operate within limits Therefore when the instructions in the functional tests that follow call for you to verify that a signal appears on screen that is about five divisions in amplitude or has a period of about six horizontal divisions and so forth do NOT interpret the quantities given as limits Operation within limits is checked in Performance Tests which begin on page 4 15 DO NOT make changes to the front panel settings that are not called out in the procedures Each verification procedure requires you to set the oscilloscope to certain default settings before verifying functions If you make changes to these settings other than those called out in the procedure you may obtain invalid results In this case just redo the procedure from step 1 When you are instructed to press a menu button the button may already be selected its label will be highlighted If this is the case it is not necessary to press the button Equipment One 6138 probe Required Prerequisites None 1 Install the test hookup and preset the oscilloscope controls Digitizing
132. d 6 9 ACCESS PrOced te Learn eei tet e e telae d RD Regards 6 13 Procedures for Module Removal and Installation 6 23 Disassembly for 6 71 Troubleshooting 6 75 Diagnostics i oe ppp REDE EP Cete ee a 6 75 Firmware Updates 2 E RE S DOE UR E EE X 6 76 Troubleshooting Equipment 6 77 Options Electrical Parts List Diagrams Mechanical Parts List TDS 420A TDS 430A amp TDS 460A Service Manual Table of Contents List of Figures Figure 1 1 TDS 400A Dimensional Drawing 1 13 Figure 2 1 Map of Display Functions 2 8 Figure 4 1 Map of Display Functions 4 3 Figure 4 2 Verifying Adjustments and Signal Path Compensation 4 6 Figure 4 3 Universal Test Hookup for Functional Tests 4 8 Figure 4 4 Initial Test Hookup 4 20 Figure 4 5 Initial Test Hookup 4 23 Figure 4 6 Initial Test Hookup 4 26 Figure 4 7 Measurement of Analog Bandwidth 4 29 Figure 4 8 Initial Test Hookup 4 31 Figure 4 9 Measurement of Channel Delay 4 33 Figure 4 10 Initial Test Hookup
133. d calibration interval and at a temperature within 5 C of the present operating temperature If at the time you did the prerequisite Self Tests the temperature was within the limits just stated consider this prerequisite met TDS 420A TDS 430A amp TDS 460A Service Manual 4 15 Performance Tests m The digitizing oscilloscope must have been last adjusted at an ambient temperature between 20 and 30 C must have been operating for a warm up period of at least 20 minutes and must be operating at an ambient temperature between 5 C and 40 C The warm up requirement is usually met in the course of meeting the prerequisites listed above Equipment Required Table 4 1 Test Equipment Item Number and Description 1 Attenuator 10X three required 2 Attenuator 5X two required 3 Termination 50 These procedures use external traceable signal sources to directly check warranted characteristics The test equipment required is shown in Table 4 1 Minimum Requirements Ratio 10X impedance 50 connec tors female BNC input male BNC output Ratio 5X impedance 50 2 connec tors female BNC input male BNC output Impedance 50 lt connectors female Example Tektronix part number 011 0059 02 Tektronix part number 011 0060 02 Tektronix part number Purpose Signal Attenuation Signal Attenuation Checking delay match be BNC input male BNC output 011 0049 0
134. d by interpolation of real time samples from asingle acquisition or by equivalent time sampling of multiple acquisitions the waveform rate is faster than the real time sample rate Forall three cases the waveform rate is 1 Waveform Interval for the waveform record where the waveform interval WI is the time between the samples in the waveform record In Hi Res the maximum Option 1M record length is 60 000 points 5 Yousetthe maximum external clock rate using the Horizontal Clock menu The Hi Res samples are averaged over a 10 to 40 ns shorter period than shown by the readout Table 1 5 Nominal Traits Triggering System Name Description Range Events Delay 1 to 9 999 999 Ranges Trigger Level or Threshold Source Range Any Channel 12 divisions from center of screen Line 400 Volts TDS 420A TDS 430A amp TDS 460A Service Manual 1 9 Nominal Traits Table 1 6 Nominal Traits Display System Name Video Display Resolution Waveform Display Graticule Waveform Display Grey Scale Description 640 pixels horizontally by 480 pixels vertically in a display area of 5 04 inches horizontally by 3 78 inches vertically single graticule 401 x 501 pixels 8 x 10 divisions with divisions that are 1 cm by 1 cm 16 levels in variable persistence display style Table 1 7 Nominal Traits Data Storage Name Capacity Nonvolatile Waveform Memory Capacity Nonvolatile Setup Memory Batt
135. d fault isolation m Performance Verification contains a collection of procedures for confirming that this digitizing oscilloscope functions properly and meets warranted limits m Adjustment Procedures contains a collection of procedures for adjusting this digitizing oscilloscope to meet warranted limits m Maintenance contains information and procedures for doing preventive and corrective maintenance of the digitizing oscilloscope Instructions for cleaning for module removal and installation and for fault isolation to a module are found here TDS 420A TDS 430A amp TDS 460A Service Manual xiii Preface Manual Conventions xiv Modules Safety Symbols Options contains information on the factory installed options that may be present in your oscilloscope Electrical Parts List contains a statement referring you to the Mechanical Parts List where both electrical and mechanical modules are listed See below m Diagrams contains a block diagram and an interconnection diagram useful for isolating failed modules m Mechanical Parts List includes a table of all replaceable modules their descriptions and their Tektronix part numbers This manual uses certain conventions which you should become familiar with before doing service Throughout this manual any replaceable component assembly or part of this digitizing oscilloscope is referred to generically as a module In general a module is an assembly like a
136. d horizontal scale and trigger level There are also readouts to display the results of measurements made using cursors or using the automatic parameter extraction feature called measure and readouts to display the status of the oscilloscope Menus are also used to assign the general purpose knob to adjust a selected parameter function The method employed is the same as for selecting a function except the final selection in the side menu causes the general purpose knob to adjust some function such as the position of measurement cursors on screen or the setting for the fine gain of a channel The user interface also makes use of a GUI or Graphical User Interface to make setting functions and interpreting the display more intuitive Some menus and status are displayed using iconic representations of function settings such as those shown here for full 100 MHz and 20 MHz bandwidth Such icons allow you to more readily determine status or the available settings TDS 420A TDS 430A amp TDS 460A Service Manual Product Description Signal Acquisition System The signal acquisition system provides vertical channels with calibrated vertical scale factors from 1 mV to 10 V per division input channels can be acquired simultaneously You can display vertically position and offset each input channel You can also limit their bandwidth to either 100 MHz or 20 MHz specify their vertical coupling and adjust their fine gain Beside
137. d prices of oscilloscope options see your Tektronix Products catalog or contact your Tektronix Field Office TDS 420A TDS 430A amp TDS 460A Service Manual 2 5 Installation 2 6 TDS 420A TDS 430A amp TDS 460A Service Manual Operating Information Before doing service read the following operating instructions These instruc tions are at the level appropriate for servicing this digitizing oscilloscope The complete operators instructions are found in the user manual Additional instructions are integrated into the service procedures found in later chapters of this manual For instance the procedures found in the Performance Verification chapter starting on page NO TAG contain instructions for making the front panel settings required to check each oscilloscope characteristic included there Also the general instructions for operating the internal diagnostic routines are found in the Maintenance chapter starting on page 6 1 You may also find the Product Description starting on page 4 1 useful for understanding how the oscilloscope functions Screen Layout The screen layout is illustrated in Figure 2 1 on page 2 8 Note that the figure illustrates a full graticule you may also select a grid crosshair or frame graticule from the display menu Basic Procedures How to Power Push the principal power switch found on the rear panel of the digitizing oscilloscope then push the ON STBY standby switch to
138. dling 1 26 Table 2 1 Power Cord Conductor Identification 2 2 Table 2 2 Power Cord Identification 2 2 Table 2 3 Effects of Corrupted Data 2 4 Table 4 1 Test Equipment 4 16 Table 4 2 DC Offset Accuracy 4 22 Table 4 3 Analog Bandwidth TDS 420A 4 27 Table 4 4 Analog Bandwidth TDS 430A and TDS 460A 4 28 Table 5 1 Adjustments Required for Module Replaced 5 3 Table 5 2 Adjustments and Dependencies 5 4 Table 5 3 Test Equipment Fixtures and Supplies 5 5 TDS 420A TDS 430A amp TDS 460A Service Manual vii Table of Contents viii Table 5 4 GPIB Board Configurationl Table 6 1 Relative Susceptibility to Static Discharge Damage Table 6 2 External Inspection Check List Table 6 3 Internal Inspection Check List Table 6 4 Tools Required for Module Removal Table 6 5 Access Instructions for Modules in Figure 6 2 Table 6 6 Access Instructions for Modules in Figure 6 3 Table 6 7 Access and Removal Instructions for Cables im Figure 6 4 i RR ERES Table 6 8 Troubleshooting Test Equipment Fixtures and Supplies Table 6 9 Connections for
139. driver Item 5 Locate the line fuse and line cord in the locator diagram Cabinet and Front Panel Mounted Modules Figure 6 2 on page 6 16 2 Orient the oscilloscope Set the oscilloscope so its bottom is down on the work surface and its rear is facing you If you are servicing the line cord do the next step if you are servicing the line fuse skip to step 5 3 Remove line cord a Find the line cord on the rear cover See Figure 6 7 Unplug 1 y B010100 B079999 4j Line Fuse 27 Line Cap 3 Pull Figure 6 7 Line fuse and line cord removal 6 26 TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures b Now remove the line cord retaining clamp by first unplugging the line cord from its receptacle c Next grasp both the line cord and the retaining clamp and rotate them 90 degrees counter clockwise 4 Pullthe line cord and clamp away to complete the removal 5 Remove line fuse Find the fuse cap on the rear panel See Figure 6 7 Now remove the fuse cap by turning it counter clockwise using a flat bladed screwdriver and remove the line fuse 6 Reinstallation Do in reverse steps 3 and 5 to reinstall the line fuse and then the line cord Front Cover Rear Cover 1 Assemble equipment and locate modules to be removed Cabinet Rear EMI Gasket and Cabinet Handle and Feet a Have handy a screwdriver wit
140. e Flex Circuits on page 6 35 m Trim Ring Menu Elastomer Menu Buttons and Front EMI Gaskets on page 6 31 Wm Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet page 6 27 to reinstall the cabinet and rear cover m Line Fuse and Line Cord page 6 26 to reinstall the line cord which completes the oscilloscope reassembly A04 Acquisition Assembly E Access the module Be sure you have performed the Access Procedure on page 6 13 and removed the modules as instructed 2 Assemble equipment and locate modules to be removed Have handy a screwdriver with a size 15 Torx tip Items 1 and 2 Locate the acquisi tion assembly in the locator diagram Internal Modules Figure 6 3 on page 6 19 3 Orient the digitizing oscilloscope Set the digitizing oscilloscope so its bottom is up with its front facing you 4 Remove the acquisition assembly Use Figure 6 28 as a guide a Unplug the cable from the backplane assembly from J7 of the acquisition assembly b Unsolder the wire from the AUX TRIGGER EXT CLOCK BNC c Remove the six screws securing the acquisition assembly to the bottom of the chassis and lift out the acquisition assembly to complete its removal TDS 420A TDS 430A amp TDS 460A Service Manual 6 69 Removal and Installation Procedures 6 70 A04 Acquisition Board Mounting Screws 6 d Figure 6 28 A04 Acquisition Board Removal 5 Reinstallation a
141. e of the field replaceable cables Do the following subparts m Go to Table 6 7 on page 6 20 m Find the procedure that includes the name of the cable noted in step 1 Perform the instructions listed in the table for that procedure to access and remove the cable m Follow the instructions listed the table for the reinstallation of the cable Then exit this procedure 3 Reinstall all modules removed Read the instructions found at the end of the procedure that removes the module to be serviced they guide you in reinstalling all modules removed All procedures are found under Procedures for Module Removal and Installation on page 6 23 which follows this access procedure TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures Table 6 5 Access Instructions for Modules in Figure 6 2 Page Procedure Including Module to be Removed No 1 Front Panel Knobs and Shafts 6 23 2 Line Fuse and Line Cord 6 26 3 Front Cover Rear Cover Cabinet Rear EMI 6 27 Gasket and Cabinet Handle and Feet 4 Trim Ring Menu Elastomer Menu Buttons 6 31 and Front EMI Gaskets 5 Disk Drive 6 34 6 X A06 Front Panel Assembly ESD Shield and 6 35 Menu Flex and Probe Code Flex Circuits Access Instructions 1 n Do only the procedure listed at left Remove only the module you want to service Do only the procedure listed at left Remove only the module you want to service Do Line Fu
142. e so its bottom is down on the work surface with its front facing you you break its display tube it may implode scattering glass fragments with high velocity and possibly injuring you Wear protective clothing including safety glasses preferably a full face shield Avoid striking the display tube with or against any object WARNING Monitor assembly handling Use care when handling a monitor If Monitor storage Store the monitor with its display tube face down in a protected location placing it on a soft nonabrasive surface to prevent scratch ing the face plate 4 Remove the monitor a Take the precautions outlined in the WARNING above Refer to Figure 6 15 while doing the following substeps b Unplug the main cable at J901 then rotate the digitizing oscilloscope so its top is down on the work surface with its bottom facing upwards c Remove the three T 15 Torx screws securing the monitor assembly to the bottom of the main chassis Return the digitizing oscilloscope to the orientation established in step 2 WARNING High voltage is present on the anode lead It is NOT necessary to unplug the anode from the monitor when removing or replacing the monitor module therefore do not do so d Remove the three T 15 Torx screws securing the monitor assembly to the top of the chassis See Figure 6 15 to locate the screws TDS 420A TDS 430A amp TDS 460A Service Manual 6 41 Removal and Installation Pro
143. e time is defined by the following formula Rise Time ns 2 1 8 TDS 420A TDS 430A amp TDS 460A Service Manual Nominal Traits Table 1 4 Nominal Traits Time Base System Name Range Sample Rate Range Equivalent Time or Interpolated Waveform Rate Range Seconds Division Range Time Base Delay Time Reference Frequency Time Base Record Length Selection Sampling Edge External Clock Hi Res Averaging Period External Clock Description 2 5 Samples s to 100 MSamples s 200 MSamples s to 50 GSamples s 1 ns div to 20 s div 0 to 20 seconds 100 MHz 500 1 000 2 500 5 000 15 000 and 30 000 points Record lengths of 60 000 and 120 000 points are available with Option 1 4 Negative edge with TTL threshold and tolerances Hi Res averaging done over period 1 maximum external clock rate but within 100 ns to 2 us An external clock edge before this period ends produces an invalid sample 1 The range of real time rates expressed samples second at which a digitizer samples signals at its inputs and stores the samples in memory to produce a record of time sequential samples 2 of waveform rates for equivalent time or interpolated waveform records 3 The Waveform Rate WR is the equivalent sample rate of a waveform record For a waveform record acquired by real time sampling of a single acquisition the waveform rate is the same as the real time sample rate for a waveform create
144. ear corner of the main chassis f Working from the rear of the oscilloscope remove the single T 15 Torx 9 screw from the bracket that secures the CPU assembly to the rear of the main chassis g Grasp the board by its edge and pull outward to unplug it from J3 of the backplane assembly h Slide the board part way out until you can reach the battery cable at J5 Unplug the battery cable i Slide the board the rest of the way out of the main chassis to complete its removal TDS 420A TDS 430A amp TDS 460A Service Manual 6 45 Removal and Installation Procedures 5 Reinstallation a Figure 6 17 A03 CPU removal 6 46 Perform in reverse order substeps 4a 4i reversing the removal instruc tions in each step and substep to reinstall the assembly After plugging in the CPU to front panel cable at J101 be sure to dress the cable so that the loop of extra cable is tucked behind the front panel assembly as shown in Figure 6 17 The cable should come from J101 on the CPU assembly and route directly through the chassis opening to the front pa nel cavity See the following procedures in the order listed to replace modules removed by the access procedure m A08 Jumper Board Assembly D1 Bus and Board Supports page 6 44 board supports m Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet page 6 27 to reinstall the cabinet and rear cover m Line Fuse and Line Cord page 6 26 to
145. ecord the performance test results for your oscilloscope TDS 400A Test Record Oscilloscope Serial Number Certificate Number Temperature RH 96 Date of Calibration Technician Performance Test Minimum Incoming Outgoing Maximum Offset Accuracy CH1 Offset HV 995 mV 1 005 V 10 V 9 935 V 10 065 V 199 9 V 99 2505 V 100 5495 V CH2 Offset 1V 995 mV 1 005 V 10 V 9 935 V 10 065 V 99 9 V 99 2505 V 100 5495 V CH3 Offset 1V 995 mV 1 005 V TDS 420A amp 10 V 9 935 V 10 065 V TDS 460A 199 9 V 99 2505 V 100 5495 V Offset 1V 995 mV 1 005 V TDS 420A amp 10 V 9 935 V 10 065 V TDS 460A 199 9 V 99 2505 V 100 5495 V DC Voltage Measurement Accuracy Averaged CH1 100 mV 20 8 mV 20 8 mV CH2 100 mV 20 8 mV 20 8 mV CH3 100 mV TDS 420A and TDS 460A 20 8 mV 20 8 mV CH4 100 mV TDS 420A and TDS 460A 20 8 mV 20 8 mV Analog Bandwidth CH1 100 mV 424 mV N A CH2 100 mV 424 mV N A CH3 100 mV TDS 420A and TDS 460A 424 mV N A CH4 100 mV TDS 420A and TDS 460A 424 mV N A Time Base System Delay Between Channels N A 450 ps Delta Time 20 ns 100 MHz 9 7 ns 10 3 ns Long Term Sample Rate Delay Time 10 ns 100 us 1 5 Div 1 5 Div 4 18 TDS 420A TDS 430A amp TDS 460A Service Manual Performance Tests TDS 400A Test Record Cont Oscilloscope Serial Number Certificate Number Temperature RH 96 Date of Calibration
146. ect Measurement for 1 Press the side menu button more until PERIOD appears in the side menu Press PERIOD Press CLEAR MENU CHECK that the readout for CH 1 Per is within 9 7 ns to 10 3 ns b Check long term sample rate and delay time accuracies against limits Press SHIFT then ACQUIRE MENU Now press the main menu button Mode then press the side menu button Sample Press MEASURE Press the main menu button Remove Measurement then press the side menu button Measurement 1 Set the horizontal SCALE of the Main time base to 100 ns TDS 420A TDS 430A amp TDS 460A Service Manual 4 35 Performance Tests 4 36 Set the frequency of the time standard to 1 0 MHz or a period of 1 00 us Adjust the amplitude of the time standard for a 5 to 7 division display Press CLEAR MENU Press SET LEVEL TO 50 Rotate the horizontal and vertical POSITION controls to move the rising edge of the waveform so that it crosses the center of both the horizontal and vertical graticule lines Press HORIZONTAL MENU then press the main menu button Time Base Press the side menu button Delayed Only Use the horizontal SCALE knob to set the D delayed time base to 100 ns Press the side menu button Delayed Runs After Main then use the General Purpose knob to set Delayed Runs After Main to 10 0 us CHECK that the rising edge of the waveform crosses the center horizontal graticule line at a point within 0 5 divisions of the c
147. ected Failures If you suspect there is damage to this product have it inspected by qualified service personnel TDS 420A TDS 430A amp TDS 460A Service Manual ix General Safety Summary Symbols and Terms A A Certifications and Compliances Terms in this Manual These terms may appear in this manual WARNING Warning statements identify conditions or practices that could result in injury or loss of life CAUTION Caution statements identify conditions or practices that could result in damage to this product or other property Terms on the Product These terms may appear on the product DANGER indicates an injury hazard immediately accessible as you read the marking WARNING indicates an injury hazard not immediately accessible as you read the marking CAUTION indicates a hazard to property including the product Symbols on the Product The following symbols may appear on the product A DANGER Protective Ground ATTENTION High Voltage Earth Terminal Refer to Manual Refer to the specifications section for a listing of certifications and compliances that apply to this product TDS 420A TDS 430A amp TDS 460A Service Manual Service Safety Summary Only qualified personnel should perform service procedures Read this Service Safety Summary and the General Safety Summary before performing any service procedures Do Not Service Alone Do not perform intern
148. ed Error in Sample Time lt 50 ps External Clock sampling uncertainty 8 ns External Clock Edge to Sampling Time Sample 20 ns Sample edge is delayed relative the the sample moment palay Hi Res Hi Res averaging starts within 8 ns of the clock edge Averaging stops after 1 maximum external clock rate Peak Detect Runs continuously at 100 MS s External Clock Minimum Prerecord points 55 points before the first visible sample in the record at the maximum clock speed 35 points before the first visible sample in the record at slow clock speeds External Clock Minimum Postrecord points 25 points after the last visible sample in the record 1 The WI waveform interval is the time between the samples in the waveform record Also see the footnotes for Sample Rate Range and Equivalent Time or Interpolated Waveform Rates in Table 1 4 on page 1 9 2 You set the maximum external clock rate using the Horizontal Clock menu 1 24 TDS 420A TDS 430A amp TDS 460A Service Manual Typical Characteristics Table 1 19 Typical Characteristics Triggering System Name Error Trigger Position Edge Triggering Holdoff Variable Main Trigger Internal Clock and non TV Trigger Holdoff Variable External Clock Auto Trigger Operation External Clock Lowest Frequency for Successful Opera tion of Set Level to 5096 Function Sensitivity Edge Trigger Not DC Coupled Video Mode Option 05 Equipped Instru ments Onl
149. ed Runs After Main to 1 00 ms Use the horizontal SCALE knob to set the D delayed time base to 100 ns m CHECK that the rising edge of the waveform crosses the center horizontal graticule line at a point within 1 5 divisions of the center graticule 3 Disconnect the hookup Disconnect the cable from the time standard at the input connector of CH 1 TDS 420A TDS 430A amp TDS 460A Service Manual 4 37 Performance Tests Trigger System Checks These procedures check those characteristics that relate to the Main and Delayed trigger systems and are listed as checked under Warranted Characteristics in Chapter 1 Specification Check Accuracy Trigger Equipment Level or Threshold DC Required Coupled One DC calibration generator Item 10 One BNC T connector Item 8 Two precision coaxial cables Item 5 Prerequisites See page 4 15 l Install the test hookup and preset the instrument controls a Hook the test signal source m Set the output of a DC calibration generator to 0 volts Connect the output of a DC calibration generator through dual banana connector followed by a 50 precision coaxial cable to one side of a BNC T connector Connect the Sense output of the generator through a second dual banana connector followed by a 50 precision coaxial cable to the other side of the BNC T connector Now connect the BNC T connector to CH 1 see Figure 4 12 Digitizing Oscilloscope Output Sense
150. ed from the factory modules are listed in Chapter 10 Mechanical Parts List isolate a failure to a module use the fault isolation procedures found in Chapter 6 Maintenance TDS 420A TDS 430A amp TDS 460A Service Manual Introduction Tektronix Service Warranty Repair Service Repair or Calibration Service Self Service To remove and replace any failed module follow the instructions in Removal and Installation Procedures also found in Chapter 6 Tektronix provides service to cover repair under warranty as well as other services that may provide a cost effective answer to your service needs Whether providing warranty repair service or any of the other services listed below Tektronix service technicians trained on Tektronix products are best equipped to service your digitizing oscilloscope Tektronix technicians are appraised of the latest information on improvements to the product as well as the latest new options to the product Tektronix warrants this product for three years from date of purchase excluding probes for which the warranty is one year The warranty appears on the back of the title page in this manual Tektronix technicians provide warranty service at most Tektronix service locations worldwide Your Tektronix product catalog lists all service locations worldwide The following services may be purchased to tailor repair and or calibration of your digitizing oscilloscope to fit your requiremen
151. el EMI Gasket Access from the front of the cabinet Handle Assembly Remove the internal Gm d screws and pull out handle hubs to remove Front Foot Rotate and remove gt EN Oa Mounting Screw Figure 6 8 Front cover rear cover cabinet emi gasket and cabinet handle and feet removal 6 28 TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures 5 Remove the cabinet a Remove the T 15 Torx screw at the left side of the oscilloscope b Grasp the two handle handle hubs and pull them outward as if to rotate the handle c While holding the handle hubs pulled out lift the cabinet upwards to slide it off the oscilloscope d Atthe rear of the cabinet grasp its left and right edges Take care not to bind or snag the cabinet on the internal cabling as you remove the cabinet e If no other cabinet modules are being serviced skip the rest of this procedure 6 Remove the handle assembly If removing the handle assembly for cleaning or replacement do the following substeps a Working from the inside of the cabinet remove the T 20 Torx screw securing each handle hub to the cabinet b Working from the outside of the cabinet grasp the two handle hubs and pull them outward from the cabinet until they are out of the cabinet c While holding the handle hubs pulled out lift the handle away to remove STOP DO NOT do step 7 to re
152. en reinstall ing align and snap the cover back on STOP DO NOT touch the carbon contact points on the menu elastomer installed in the trim ring Also do not touch the contacts on the menu button flex circuit exposed when you remove the trim ring You should wear clean cloth gloves that are free of lint when handling the menu elastomer or when touching the menu button flex circuit mounted on the front chassis Trim Ring To remove grasp its back edge and press up on its two tab locks Flex the trim ring upward then pull it forward Repeat for the bottom edge of the trim ring Figure 6 9 Trim ring menu elastomer and menu buttons removal TDS 420A TDS 430A amp TDS 460A Service Manual 6 31 Removal and Installation Procedures 6 32 Remove the trim ring a c Grasp the trim ring by its top edge and pry it up and lift it forward to snap it off of the top front of the main chassis Repeat the process prying on the bottom edge of the trim ring to complete its removal Lay the trim ring on its face on the work surface Remove the EMI gaskets If servicing the front EMI gaskets lift them out of the trim ring Remove the menu elastomer If servicing the menu elastomer lift it out of the trim ring Remove the menu buttons servicing the menu buttons lift them out of the trim ring Reinstallation a If the menu buttons were
153. ence level Change the sine wave generator to the desired new frequency TDS 420A TDS 430A amp TDS 460A Service Manual Performance Tests Input the correction factor for the new frequency into the level meter m Adjust the sine wave generator amplitude until the level meter again reads the value noted in step 3 The signal amplitude is now correctly set for the new frequency Alternate Procedure for Equipment Sine Wave Generator Item 11 Li H Maximum Amplitude Level Meter and Power Sensor Item 12 Two Male N to Female BNC Adapters Item 15 Two precision coaxial cables Item 5 Prerequisites See page 4 15 1 Install the test hookup Connect the equipment as shown in Figure 4 24 start with the sine wave generator connected to the digitizing oscilloscope Digitizing Oscilloscope Sine Wave Generator Output Level Meter Connect sine wave generator to the oscilloscope and the Power Sensor power sensor as O directed in the text A u Input Figure 4 24 Equipment Setup for maximum Amplitude 2 Set the Generator m Set the sine wave generator to a reference frequency of 10 MHz Adjust the sine wave generator amplitude to the required number of divisions as measured by the digitizing oscilloscope TDS 420A TDS 430A amp TDS 460A Service Manual 4 57 Performance Tests 4 58 Record the refere
154. ength vs Divisions per Record 1 3 Table 1 3 Nominal Traits Signal Acquisition System 1 7 Table 1 4 Nominal Traits Time Base System 1 9 Table 1 5 Nominal Traits Triggering System 1 9 Table 1 6 Nominal Traits Display System 1 10 Table 1 7 Nominal Traits Data Storage 1 10 Table 1 8 Nominal Traits GPIB Interface Video Output and Power EUSe urs eus wx eR E REUS EA RI E 1 10 Table 1 9 Nominal Traits Mechanical 1 11 Table 1 10 Warranted Characteristics Signal Acquisition SVSLOI ees ers ore OPES EAR See Blas Haw See Rcg 1 15 Table 1 11 Warranted Characteristics Time Base System 1 17 Table 1 12 Warranted Characteristics Triggering System 1 18 Table 1 13 Warranted Characteristics Probe Compensator un RII Sees Raat oat iva nea DEN DUE 1 18 Table 1 14 Warranted Characteristics Power Requirements 1 18 Table 1 15 Warranted Characteristics Environmental Safety and Reliability 1 19 Table 1 16 Certifications and compliances 1 20 Table 1 17 Typical Characteristics Signal Acquisition System 1 23 Table 1 18 Typical Characteristics Time Base System 1 24 Table 1 19 Typical Characteristics Triggering System 1 25 Table 1 20 Typical Characteristics Data Han
155. ent parts The following table describes each column in the parts list Parts List Column Descriptions Column Column Name Description 1 Figure amp Index Number Items in this section are referenced by figure and index numbers to the exploded view illustrations that follow 2 Tektronix Part Number Use this part number when ordering replacement parts from Tektronix 3and4 Serial Number Column three indicates the serial number at which the part was first effective Column four indicates the serial number at which the part was discontinued No entries indicates the part is good for all serial numbers 5 Qty This indicates the quantity of parts used 6 Name amp Description An item name is separated from the description by a colon Because of space limitations item name may sometimes appear as incomplete Use the U S Federal Catalog handbook H6 1 for further item name identification 7 Mir Code This indicates the code of the actual manufacturer of the part 8 Mfr Part Number This indicates the actual manufacturer s or vendor s part number Abbreviations Abbreviations conform to American National Standard ANSI Y1 1 1972 Mfr Code to Manufacturer table titled Manufacturers Cross Index shows codes names and addresses Cross Index of manufacturers or vendors of components listed in the parts list 10 2 TDS 420A TDS 430A amp TDS 460A Service Manual Mfr Code 53109 53629 54246
156. enter graticule see Figure 4 11 Use the horizontal SCALE knob to set the D delayed time base to 50 us The scale of the Main time base will also change Use the General Purpose knob to set Delayed Runs After Main to 100 us Use the horizontal SCALE knob to set the D delayed time base to 100 ns CHECK that the rising edge of the waveform crosses the center horizontal graticule line at a point within 0 5 divisions of the center graticule TDS 420A TDS 430A amp TDS 460A Service Manual Performance Tests Check that the waveform rising edge is within 0 5 horizontal divisions on the center 3 horizontal graticule line Tek Run Sample pery Time 10 0035 Time Base Main Only SA Intensified Set the 1 delayed gt horizontal Delayed Only modes Delayed Runs Boo uA Delayed M 100ns Chi mV Triggerable 100ns Runs Afte see Delayed i RE Trig Menu fam rigger Position 50 Internal Time Base Delayed Enter a 10 0 us delay and set the horizontal scale for the D time base to 100 ns Figure 4 11 Measurement of Accuracy Long Term and Delay Time m Setthe horizontal SCALE of the D delayed time base to 500 us The scale of the Main time base will also change m Use the General Purpose knob to set Delay
157. enu button Recall Factory Setup m Press the side menu button OK Confirm Factory Init b Modify the default settings W Press TRIGGER MENU W Press the main menu button COUPLING then press the side menu button Noise Rej TDS 420A TDS 430A amp TDS 460A Service Manual 4 25 Performance Tests 4 26 W Press SHIFT then ACQUIRE MENU Press the main menu button Mode then press the side menu button Average 16 Press Measure Now press the main menu button High Low Setup then press the side menu button Min Max Sine Wave Digitizing Oscilloscope Generator Output Figure 4 6 Initial Test Hookup NOTE Refer to the Sine Wave Generator Leveling Procedure on page 4 55 if your sine wave generator does not have automatic output amplitude leveling c Hook up the test signal source m Connect the sine wave output of a sine wave generator to CH 1 see Figure 4 6 Set the output of the generator to a reference frequency of 10 2 or less m Setthe horizontal SCALE to 50 ns If using a reference other than 10 MHz adjust the horizontal SCALE to display 4 to 6 cycles of the waveform 2 Confirm the input channels are within limits for analog bandwidth Do the following substeps test CH 1 first skipping substeps a and b since CH 1 is already set up for testing from step 1 a Select an unchecked channel m Press WAVEFORM OFF to remove the channel just confirmed from display Press the fro
158. er cables are of equal length Sine Wave Digitizing Oscilloscope Generator Output L Dual Input Coupler 50 Q Terminator Figure 4 8 Initial Test Hookup 2 Confirm all channels are within limits for channel delay a Set up the generator Set the generator frequency to 250 MHz and the amplitude for about five divisions in CH 1 Hint as you are adjusting the generator amplitude push SET LEVEL TO 50 frequently to speed up the updating of the waveform amplitude on screen b Savea CH 2 waveform Press CH 2 then press save recall WAVE FORM Nov press the main menu button Save Waveform then press the side menu button To Ref 2 TDS 420A TDS 430A amp TDS 460A Service Manual 4 31 Performance Tests c Ifyou are testing a TDS 430A skip to step h d Save a 3 waveform Move the coupler from CH 2 to CH 3 so that CH 1 and CH 3 are driven Press CH 3 then press the side menu button To Ref 3 e Display all test signals Press WAVEFORM OFF twice to remove CH 2 and CH 3 from the display Move the coupler from CH 3 to CH 4 so that CH 1 and CH 4 are driven Press CH 4 to display Now press the front panel button MORE Press the main menu buttons Ref 2 and Ref 3 f Measure the test signal Locate the point on the rising edge of the left most waveform where it crosses the center horizontal graticule line This is the time reference point for this
159. er is obtained for the test waveform for both the positive and negative slopes of the waveform Use the General Purpose knob to stabilize the trigger if required Press the main menu button Slope then use the side menu to switch between trigger slopes m Leave the delayed trigger system triggered on the positive slope of the waveform before continuing to the next step Also return to the main time base Press HORIZONTAL MENU then press the main menu button Time Base Now press the side menu button Main Only 3 Confirm that the Main and Delayed trigger systems are within sensitivity limits at upper frequency limits a Hook up the test signal source Disconnect the hookup installed in step 1 Connect the signal output of a sine wave generator to CH 1 TDS 420A TDS 430A amp TDS 460A Service Manual 4 43 Performance Tests b Set the Main and Delayed Horizontal Scales m Setthe horizontal SCALE to 5 ns for the M Main time base W Press the side menu button Delayed Only m Set the horizontal SCALE to 2 ns for the D Delayed time base Press the side menu button Main Only c Display the test signal m Set the generator frequency to 350 MHz TDS 420A or 500 MHz TDS 430A and TDS 460A m Set the test signal amplitude for about five divisions on screen Now fine adjust the generator output until the CH 1 Amplitude readout indicates the amplitude is 500 mV Readout may fluctuate around 500 mV m Disconnect the sine w
160. erating temperature is decreased 1 C per 1000 feet 305 meters above 5000 feet 1525 meters TDS 420A TDS 430A amp TDS 460A Service Manual 1 19 Warranted Characteristics Table 1 16 Certifications and compliances Category Standards or description EC Declaration of Conformity Meets intent of Directive 89 336 EEC for Electromagnetic Compatibility Compliance was EMC demonstrated to the following specifications as listed in the Official Journal of the European Communities EN 61326 EMC requirements for Class A electrical equipment for measurement control and laboratory use IEC 61000 4 2 Electrostatic discharge immunity Performance criterion B IEC 61000 4 3 RF electromagnetic field immunity Performance criterion A IEC 61000 4 4 Electrical fast transient burst immunity Performance criterion B IEC 61000 4 5 Power line surge immunity Performance criterion B IEC 61000 4 6 Conducted RF immunity Performance criterion A IEC 61000 4 11 Voltage dips and interruptions immunity Performance criterion B EN 61000 3 2 AC power line harmonic emissions Australia New Zealand Complies with EMC provision of Radiocommunications Act per the following standard s Declaration of Conformity EMO S 2 AS NZS 2064 1 2 Industrial Scientific and Medical Equipment 1992 FCC Compliance Emissions comply with FCC Code of Federal Regulations 47 Part 15 Subpart B Class A Limits 1 1 20 To maintain emission requirements when connectin
161. eries Required Description Total capacity is 120 000 points one to four waveforms acquired with any combination of record lengths that add up to 120 000 points For available record lengths see Record Length Selection on page 1 9 of this chapter Ten setups Two lithium poly carbon monofluoride Both are type BR2 3A UL listed Both are rated at 3 0 volt 1 2 amp hour 1 Batteries not accessible from the outside of the instrument therefore a service technician must replace them Table 1 8 Nominal Traits GPIB Interface Video Output and Power Fuse Name Interface GPIB Interface RS 232 Option 13 only Description GPIB interface complies with IEEE Std 488 1 1987 and IEEE Std 488 2 1987 RS 232 interface complies with EIA TIA 574 Interface Centronics Option 13 only Centronics interface complies with Centronics interface standard C332 44 Feb 1977 REV A Power Supply Printer Option 13 only Supply Voltage 16 5 VDC Maximum Current 2 Amps DC continuous 4 Amps DC maximum for durations 10 msec Output Video Provides a video signal non interlaced with levels that comply with ANSI RS343A Output is through a rear panel DB 15 connector Fuse Rating Either of two fuses may be used a 0 25 x 1 25 UL 198 6 3AG 8A FAST 250 V or a5 mm x 20 mm IEC 127 6 3 A FAST 250 V 1 VGA compatible at 30 6 kHz sync rate 2 Each fuse type requires its own fuse cap
162. es See Figure 6 4 on page 6 22 for jack location Reverse these instructions to install the replacement cable Find the procedure A01 Backplane Assembly and its Mount in Table 6 6 Follow the access instructions found there to access and remove the backplane assembly Unsolder the cable s to be replaced using a 15 watt soldering iron and remove it Reverse these instructions to install the replacement cable Find the procedure A06 Front Panel Assembly ESD Shield and Menu Flex and Probe Code Flex Circuits in Table 6 6 Follow the access instructions found there to access and remove the front panel assembly The cables plugged into that assembly are removed in the process Unplug the cable to be replaced from the backplane assembly See Figure 6 4 for jack location Reverse these instructions to install the replacement cable Reach in from the top of the oscilloscope and unplug the cable at the jacks at the front of the backplane and low voltage power supply modules Reverse these instructions to install the replacement cable 5 Aux Supply to Line Filter Aux Supply to Low Voltage Power Supply Find the procedure A07 Auxiliary Power Supply in Table 6 6 Follow the access instructions found there to access and remove the auxiliary power supply assembly Unsolder the cable to be replaced using a 15 watt soldering iron and remove it from the auxiliary power supply Reverse these instructions to install the replacement
163. es are found and reported on screen TDS 420A TDS 430A amp TDS 460A Service Manual 4 5 Brief Procedures Display the CAL menu 4 6 1 e Confirm the four adjustment sections have passed status Press SHIFT then press UTILITY Press the main menu button System until Cal is highlighted in the pop up menu Verify that the word Pass appears in the main menu under the following menu labels Voltage Reference High Frequency Response Low Frequency Response and Trigger Skew See Figure 4 2 Tek Run 1 00MS s Sample Signal Path jCompensatio Config Diag E System iCal Signal Path Compensation SPC corrects for DC inaccuracies caused by ambient temperature variations and or long term drift SPC can be run at any time after the instrument is and should be run whenever the instrument s ambient temperature has changed by more than 5 e ad by input signals with AC components Disconnect or otherwise remove these signals prior to running SPC ow Freq High Freq Reference Response Response Pass Pass Pass rigger Skew P ass J Signal Paths OK Compensate 3 2 Run a signal path Verify Pass status for the compensation and verify adjustment sections status is Pass Figure 4 2 Verifying Adjust
164. es the problem replace in order the A03 CPU the A09 DSP the A02 Display and the A01 Backplane modules Figure 6 52 Console Troubleshooting Procedure 6 102 TDS 420A TDS 430A amp TDS 460A Service Manual Options and Accessories Options Option 02 Front Cover and Pouch TDS 400A Only Option 05 Video Trigger Option 13 RS 232 Centronics Hardcopy Interface Option 1M 120 000 Point Record Length Option 1R Rackmounted Digitizing Oscilloscope Option 2F Advanced DSP Math Option XL Options 02 13 1M and 2F Option 95 Test Data Report This chapter describes the various options and accessories that are available for the TDS 420A TDS 430A and TDS 460A Digitizing Oscilloscopes The following options are available See Option XL This option provides a video trigger It lets you trigger on positive or negative sync pulses It also lets you select interlaced field one interlaced field two or both fields noninterlaced You can define the signal class to be NTSC PAL SECAM or you can customize the class See Option XL See Option XL With this option Tektronix ships the digitizing oscilloscope configured for installation in a 19 inch wide instrument rack See Option XL With this option Tektronix ships a front cover and pouch RS 232 and a Centronics interface that can be used to obtain hardcopies of the oscilloscope screen a 120 000 Point Record Length and advanced
165. etting Offset Range 1 mV div to 99 5 mV div 1V 100 mV div to 995 mV div 10V 1 V div to 10 V div 100 V Range Position 5 divisions Range Sensitivity 1 mV div to 10 V div TDS 420A TDS 430A amp TDS 460A Service Manual 1 7 Nominal Traits Table 1 3 Nominal Traits Signal Acquisition System Cont Name Description Rise Time Volts Div Setting Rise Time 1054208 5 mV div 10 V div 1 75 ns 2 mV div 4 98 mV div 2 33 ns 1 mV div 1 99 mV div 3 68 ns Rise Time Volts Div Setting Rise Time TDS 430A and TDS 460A 5 mVidiv 10 V div 875 ps 2 mV div 4 98 mV div 1 4 ns 1 mV div 1 99 mV div 3 5 ns 1 Displayed vertically with 25 digitization levels DLs per division and 10 24 divisions dynamic range with zoom off DL is the smallest voltage level change resolved by the 8 bit A D Converter with the input scaled to the volts division setting of the channel used Expressed as a voltage a DL is equal to 1 25 of a division times the volts division setting GND input coupling disconnects the input connector from the attenuator and connects a ground reference to the input of the attenuator 3 The sensitivity ranges from 1 mV div to 10 V div in a 1 2 5 sequence of coarse settings Between consecutive coarse settings the sensitivity can be finely adjusted with a resolution of 1 of the more sensitive setting For example between 50 mV div and 100 mV div the volts division can be set with 0 5 mV resolution 4 Ris
166. extra cable length is in the front panel cavity of the chassis as shown in Figure 6 4 See the following procedures to install those modules removed by the access procedure Wm Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet page 6 27 to reinstall the cabinet and rear cover m Line Fuse and Line Cord page 6 26 to reinstall the line cord which completes the oscilloscope reassembly TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures E A05 Attenuator Assembly Access the module Be sure you have performed the Access Procedure on and Shield page 6 13 and removed the modules as instructed 2 Assemble equipment and locate modules to be removed Have handy a screwdriver with a size T 15 Torx tip Items 1 and 2 3 Orient the oscilloscope Set the oscilloscope so its top is down on the work surface and its front is facing you 4 Remove the Attenuator Assembly a Unplug the backplane to attenuator cable at J101 b Using Figure 6 14 as a guide remove the four T 15 Torx screws securing the attenuator assembly to the front of the chassis c Liftthe attenuator assembly away from the oscilloscope to complete its removal 5 Reinstallation a Perform in reverse order substeps 4a and 4c reversing the removal instructions in each substep to reinstall the assembly b Seethe following procedures in the order listed to replace modules removed by the access p
167. fan mount so its four retainer lugs slide from their small retainer holes in the chassis into their large release holes d Move the fan mount inward so its retainer lugs are out of the large retainer holes and lift it out of the chassis to remove TDS 420A TDS 430A amp TDS 460A Service Manual 6 63 Removal and Installation Procedures Lift flex Releasing the Fan Mount Lugs lt Left Rear of Scope Move fan mount inward and lift Press flex locks Retainer Lugs 4 Figure 6 25 Fan and fan mount removal 6 Reinstallation a Ifthe fan mount was removed perform in reverse order substeps 5a 5d reversing the removal instructions in each substep to reinstall the fan mount Be sure to seat the fan mount so its two flex locks snap to secure it on the chassis b Doin reverse order substeps 4a 4c to reinstall the fan c Seethe following procedures to replace the modules removed by the access procedure Wm Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet page 6 27 to reinstall the cabinet and rear cover 6 64 TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures m Line Fuse and Line Cord page 6 26 to reinstall the line cord which completes the oscilloscope reassembly Line Filler 1 Access the module Be sure you have performed the Access Procedure on page 6 13 and removed the modules as inst
168. fective module Repair or replace missing or defective knobs Replace defective modules Clear or wash out dirt Replace defective module Replace damaged or missing items frayed cables and defec tive modules Cleaning Procedure Exterior Use the following procedure to clean the exterior of the oscilloscope CAUTION prevent getting moisture inside the oscilloscope during external cleaning use only enough liquid to dampen the cloth or applicator 1 Remove loose dust on the outside of the oscilloscope with a lint free cloth 2 Remove remaining dirt with a lint free cloth dampened in a general purpose detergent and water solution Do not use abrasive cleaners 3 Clean the monitor screen with a lint free cloth dampened with either isopro pyl alcohol or preferably a gentle general purpose detergent and water solution Inspection Interior To access the inside of the oscilloscope for inspection and cleaning refer to the Removal and Installation Procedures on page 6 9 Inspect the internal portions of the oscilloscope for damage and wear using Table 6 3 as a guide Defects found should be repaired immediately If any electrical module is replaced check Table 5 1 on page 5 3 to see if it is necessary to adjust the oscilloscope A CAUTION To prevent damage from electrical arcing ensure that circuit boards and components are dry before applying power to the oscilloscope TDS 420A TDS
169. g cables to this oscilloscope use only a high quality double shielded braid and foil cable The cable shield must have low impedance connections to both connector housings Acceptable cables are listed GPIB Tektronix part numbers 012 0991 00 01 02 and 03 Centronics Tektronix part number 012 1214 00 RS 232 CA part number 0294 9 VGA Video LCOM part number CTL3VGAMM 5 Emissions which exceed the levels required by this standard may occur when this equipment is connected to a test object lt 0 5 division waveform displacement or 1 0 division increase in peak to peak noise when subjected to 3 V m electromagnetic field over the frequency range of 80 MHz to 1000 MHz TDS 420A TDS 430A amp TDS 460A Service Manual Warranted Characteristics Table 1 16 Certifications and compliances cont Category EC Declaration of Conformity Low Voltage U S Nationally Recognized Testing Laboratory Listing Canadian Certification Additional Compliance Installation Overvoltage Category Pollution Degree Standards or description Compliance was demonstrated to the following specification as listed in the Official Journal of the European Union Low Voltage Directive 73 23 EEC amended by 93 69 EEC EN 61010 1 A2 1995 Safety requirements for electrical equipment for measurement control and laboratory use UL3111 1 Standard for electrical measuring and test equipment CAN CSA C22 2 No 1010 1 Safety requirements f
170. gured for PCII and PCIIA operation Table 5 4 lists the default card settings b Ifthese settings conflict with your hardware setup see your GPIB card manual for alternate settings Table 5 4 GPIB Board Configuration Board Settings GPIB PCII GPIB PCIIA Base I O Address hex Interrupt Line DMA Channel 1 Systems using the combination card GPIB PCII IIA can be configured as either a GPIB PCII or a GPIB PCIIA c Ifyou have more than one GPIB card installed this adjustment software assumes the first card referenced 0 See your GPIB card manual for information on how to determine which card is your 0 card Software Installation NOTE ALWAYS use this installation procedure when installing this software on a new computer This installation program uses parameters you supply see step 2 substep c to create a custom start up file on your hard disk directory After installation you will be instructed to run this start up batch file whenever you do software based adjustments so it can configure your computer properly before it runs the adjustment program Do not simply copy the software files from one computer to another since the start up batch file you copy might not match the computer you copy it to 1 Create a working disk Power on and boot your system Using the proper DOS commands copy the adjustment software for your digitizing oscillo scope to a working disk TDS 420A TDS 430A amp TDS 460A Service
171. h size 15 and T 20 Torx tips Items 1 2 and 3 If removing the EMI gasket at the inside rear of the cabinet also have handy a pair of needle nose pliers Item 7 b Make sure the oscilloscope front cover is installed if it is not install it by snapping its edges over the trim ring c Locate the rear cover and cabinet in the locator diagram Cabinet and Front Panel Mounted Modules Figure 6 2 on page 6 16 2 Orient the oscilloscope a Pull out on both of the hubs on the cabinet handle to unlock it for positioning While holding the hubs unlocked rotate the handle towards the bottom of the oscilloscope b Setthe oscilloscope so its face is down with its front cover on the work surface and its bottom facing you Reference Figure 6 8 on page 6 28 as you do the following steps 3 Remove the front feet If removing a front foot for replacement use a pair of slip jaw pliers to firmly grip the foot then pull with a turning motion to remove Reverse the process to install the replacement foot If no other modules are being serviced skip to the end step 8 of this procedure 4 Remove rear cover Remove the four T 15 Torx screws securing the rear cover to the oscilloscope Lift off the rear cover If no other modules are being serviced skip to the end step 8 of this procedure TDS 420A TDS 430A amp TDS 460A Service Manual 6 27 Removal and Installation Procedures Label Mounting Screws 4 C 4 lt Lab
172. hat secure s the bracket or assembly to the rear of the main chassis nplug the backplane to acquisition cable at J7 of the acquisition assembly nplug the backplane to attenuator cable at J101 of the attenuator ssembly o Unplug the backplane to AUX power cable at J6 of the backplane Unplug the backplane to front panel cable at J8 of the backplane assembly c nplug the backplane to low voltage power cable at J7 of the backplane assembly 6 50 TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures Lift latches 4 to release the board Figure 6 20 A01 Backplane assembly and its mount removal g Remove the five T15 Torx screws mounting the board to the chassis h Turn the digitizing oscilloscope so its bottom is facing down on the work surface Leave its front facing to the left i Find the flex lock nearest the front of the digitizing oscilloscope Using a flat bladed screwdriver push the flex lock so it flexes enough to clear the board j While holding the flex lock slightly pull up on the front corner of the board nearest that retainer until the board clears that flex lock Repeat for the remaining three flex locks TDS 420A TDS 430A amp TDS 460A Service Manual 6 51 Removal and Installation Procedures k Once the board is clear of all four flex locks grasp the board by the edge near those flex locks and ro
173. he GPIB and an external software package The processor system also includes a GPIB interface The processor can display text and symbols that is cursors but not waveforms by passing them to the A02 Display board DSP The digital signal processor processes each waveform as directed by software downloaded from the system processor Waveforms to be displayed are passed on to the A02 Display board Display Text and waveforms are processed by different parts of the A02 Display circuitry The display sends the text and waveform information to the A26 Moni tor assembly as a video signal The display circuitry also generates and sends vertical VS YNC and horizontal HS YNC sync signals to the A26 Monitor assembly A VGA compatible video output is available at the rear of the oscilloscope TDS 420A TDS 430A amp TDS 460A Service Manual Theory of Operation Monitor Assembly All information waveforms text graticules and pictographs is displayed by the A20 CRT Driver The driver generates the high voltages necessary to drive the CRT It also contains the video amplifier horizontal oscillator and the vertical and horizontal yoke driver circuitry The monitor gets its supply voltages from the A25 Low Voltage Power Supply through the A01 Backplane and the A07 Auxiliary Power boards Front Panel The processor system sends instructions to and receives information from the Front Panel Processor on the A06 Front Panel board The Front Pane
174. he battery clip is necessary remove the T15 Torx screw mounting the clip to the chassis TDS 420A TDS 430A amp TDS 460A Service Manual 6 53 Removal and Installation Procedures To J5 of A03 CPU Assembly To J5 ofthe A09 DSP Assembly 7 NS Z Z EA s N N a 4 NN S N Wu S e D 2 D Figure 6 21 Battery removal 6 Reinstallation a Ifthe battery retaining clip s was removed do step 5 reversing the removal instructions to reinstall the each battery clip b Do steps 3 and 4 reversing the removal instructions to reinstall the each battery c See the following procedures in the order listed to replace modules removed by the access procedure Wm Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet page 6 27 to reinstall the cabinet and rear cover m Line Fuse and Line Cord page 6 26 to reinstall the line cord which completes the oscilloscope reassembly 6 54 TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures E Power Factor Correction Access the module Be sure you have performed the Access Procedure on Module page 6 13 and removed the modules as instructed B080000 amp up 2 Locate modules to be removed a Use a screwdriver with a size 15 Torx tip Items 1 and 2 and a 1 4 inch nut driver b Locate the
175. ice Manual J2 Pin 20 8 6 2 Minimum Output 5 05 V 114 85 V 6 35 V 14 85 V Maximum Output 5 15 V 115 15 V 6 45 V 15 15 V 6 85 Troubleshooting Use this procedure to troubleshoot a power supply overload problem CAUTION Turn the oscilloscope power off before removing a board or disconnecting a cable Remove loads one at a time remove each plug in circuit board and disconnect cables from the A01 Backplane Does the supply work ok when a specific board or cable is removed Yes Replace board or cable that has the fault No the supply work ok when all boards and cables are removed Y gt Replace the A01 Backplane No the supply work ok when the load is reduced by removing or disconnecting one or more boards or cables but not due to an overload or short on a specific board or cable No Replace the A25 Low Voltage Power Supply Yes Check the current drawn from the power supply secondary Does the current drawn exceed the specification shown in Table 6 12 No Replace the A25 Low Voltage Power Supply Yes Check and repair the circuit Figure 6 35 Power Supply Overload Troubleshooting Procedure 6 86 TDS 420A TDS 430A amp TDS 460A Service Manual Troubleshooting Table 6 12 Power Supply Maximum Current Supply 5 1V 15 V 6 4V 15V J2 Pins 16 20
176. ify the initialized front panel control settings W Press AUTOSET Set the horizontal SCALE to 200 us Press SHIFT then press ACQUIRE MENU Press the main menu button Mode then press the side menu button Hi Res 2 Confirm that the Probe Compensator signal is within limits for amplitude and frequency a Measure the amplitude and frequency of the probe compensation signal Press MEASURE then press the main menu button Select Measurement for Ch1 W Now repeatedly press the side menu button more until Amplitude appears in the side menu its icon is shown at the left Press the side menu button Amplitude m Repeatedly press the side menu button more until Frequency appears in the side menu its icon is shown at the left Press the side menu button Frequency 4 54 TDS 420A TDS 430A amp TDS 460A Service Manual Performance Tests Press CLEAR MENU to remove the menus from the display See Figure 4 22 Tek Run 250 5 5 Hi Res Ch Ampl 500mv Chl Freq 1 0000kHz2 CO COICOICOICO Tb om ts CHi 7 264mV 21 Jul 2035 21 23 46 Oeo GIGIO Figure 4 22 Measurement of Probe Compensator Limits b Check against limits CHECK that the CH 1 Freq readout is within 950 Hz to 1 050 kHz inclusive and that the readout for Ch1 Ampl is within 475 mV to 525 mV inclusive
177. in Null Modem Cable DB 9 Signals DB 9 Pin DB 25 Pin DB 25 Signals DCD 1 20 DTR RD 2 2 TD TD 3 3 RD DTR 4 6 and 8 DSR and DCD SG 5 7 SG DSR 6 20 DTR RTS 7 5 CTS CTS 8 4 RTS Unused RI 9 All Others Unused 4 Connecting the equipment Attach the console port cable to J3 on the A03 CPU module see Figure 6 30 and using an extender cable or adaptors to the RS 232 serial port of your personal computer or RS 232 terminal 5 Configure the personal computer a Load the software Load telecommunication terminal software into your personal computer b Select the software port Configure the telecommunication software so that it accesses the serial port that you connected to the console port 1 or Com2 c Configure port parameters Set the telecommunication software or terminal parameters W Baud Rate 9600 Parity None m Data Bits 8 m Stop Bits 1 m Duplex Full Protocol None 6 78 TDS 420A TDS 430A amp TDS 460A Service Manual Troubleshooting m Terminal ANSI d Select terminal mode After configuring the software parameters switch the software to terminal mode 6 Use the console port Power up the oscilloscope Diagnostic messages are echoed to the personal computer display BN Pi Console Port Tektronix part number 222 174 2613 00 2 Extension Cable 77 Figure 6 30 Console po
178. ine filter last c Now release and disconnect the remote power cable where it joins the cable from the low voltage power supply assembly d Unplug the two connectors at the line filter WARNING When reconnecting the auxiliary power supply assembly to the line filter be sure to connect the neutral side of the line filter to the black striped lead and the load side to the white striped lead e Remove the two 15 Torx 9 screws mounting the auxiliary power supply assembly to the chassis Then pull up on the board to release it from the two retainers Lift the board out of the chassis to complete the removal TDS 420A TDS 430A amp TDS 460A Service Manual 6 67 Removal and Installation Procedures Figure 6 27 Auxiliary power supply removal B010100 B079999 5 Reinstallation a Perform in reverse order substeps 4a 4e reversing the removal instruc tions in each substep to reinstall the assembly Be sure to seat the board until the two mounting posts snap locked on the assembly when reinstalling 6 68 TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures b Seethe following procedures in the order listed to replace modules removed by the access procedure m A08 Jumper Board Assembly D1 Bus and Board Supports on page 6 44 board supports and D1 bus only m A06 Front Panel Assembly ESD Shield and Menu Flex and Probe Cod
179. ing Press the side menu button Q to toggle it to the 50 setting Press TRIGGER MENU Press the main button SOURCE then press the side menu button more until Auxiliary appears in the side menu Press the side menu button Auxiliary Press the Coupling main menu button then press the side menu button c Hook up the test signal source m Connect a BNC T connector to the output of the sine wave generator see Figure 4 15 Connect one 50 Q cable to one side of the BNC T connector connect a second 50 2 cable to the other side of the BNC T connector Connect one of the cables just installed to CH 1 connect the other cable just installed to the AUX TRIGGER input at the rear panel To Rear Panel E Sine Wave A rane Digitizing Oscilloscope Generator Figure 4 15 Initial Test Hookup TDS 420A TDS 430A amp TDS 460A Service Manual 4 45 Performance Tests NOTE Refer to the Sine Wave Generator Leveling Procedure on page 4 55 if your sine wave generator does not have automatic output amplitude leveling 2 Confirm the Trigger input a Display the test signal m Set the generator for a 10 MHz four division signal b Check the Main trigger system for stable triggering at limits m Read the following definition A stable trigger is one that is consistent that is one that results in a uniform regular display triggered on the selected slope positive or negative This displa
180. input The minimum pulse width and rearm width required for recognizing a delaying event Table 1 20 Typical Characteristics Data Handling Name Description Time Data Retention Nonvolatile Internal batteries installed at time of manufacture have a life of gt 5 years when operated Memory and or stored at an ambient temperature from 0 C to 50 C Retention time of the nonvolatile memories is equal to the remaining life of the batteries Nonvolatile Memory Save Time 10 seconds Floppy Disk Drive Capacity 3 5 in floppy disk 720 KB or 1 44 MB compatible with DOS 3 3 format for storing waveforms hard copies and instrument setups 1 2 1 26 The time that reference waveforms stored setups and calibration constants are retained when there is no power to the oscilloscope Data is maintained by lithium poly carbon monofluoride TDS 420A TDS 430A amp TDS 460A Service Manual Installation This chapter contains information about supplying operating power the operating environment applying and interrupting power repackaging for shipment and installed options Supplying Operating Power A Power Cord Information STOP Read all information and heed all warnings in this chapter before connecting the digitizing oscilloscope to a power source WARNING AC POWER SOURCE AND CONNECTION The digitizing oscillo scope operates from a single phase power source It has a three wire power cord and a two
181. ision reference signals listed in the tables i Test all channels Repeat substeps a through g for all channels 3 Disconnect the hookup Disconnect the test hook up from the input connector of the channel last tested Check Delay Match Equipment One sine wave generator Item 11 Reaui Between Channels zu One precision coaxial cable Item 5 One 50 Q terminator Item 3 One dual input coupler Item 9 Prerequisites See page 4 15 STOP DO NOT use the vertical position knob to reposition any channel while doing this check To do so invalidates the test l Install the test hookup and preset the oscilloscope controls a Initialize the front panel Press save recall SETUP Press the main menu button Recall Factory Setup Press the side menu button OK Confirm Factory Init 4 30 TDS 420A TDS 430A amp TDS 460A Service Manual Performance Tests b Modify the initialized front panel control settings Do not adjust the vertical position of any channel during this procedure m Setthe horizontal SCALE to 1 ns Press SHIFT then press ACQUIRE MENU Press the main menu button Mode and then press the side menu button Average 16 c Hook up the test signal source m Connect the sine wave output of a sine wave generator to a 50 precision coaxial cable a 50 Q termination and a dual input coupler See Figure 4 8 Connect the coupler to both CH 1 and CH 2 Ensure that the coupl
182. isolate problems on the 12 bus Power off the oscilloscope Using the Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet disassembly procedure remove the cabinet Using the Console Port Set Up procedure connect the console port cable to the oscilloscope and to your personal computer Power off the oscilloscope Disconnect the cable to connector J101 on the A05 Attenuator board Power on the oscilloscope Does the oscilloscope power up normally Yes Replace J101 the Attenuator Backplane cable or the A05 Attenuator module Power off the oscilloscope Reconnect the cable to connector J101 on the A05 Attenuator board Remove the connector to J7 on the A05 Attenuator board Power up the oscilloscope Replace J7 the Acquisition Backplane cable Does the Yes oscilloscope power up normally or the A04 Acquisition module No Power off the oscilloscope Replace the A01 Backplane module Power on the scope Does the oscilloscope power up normally No Power off the oscilloscope and replace the A03 CPU board Power on the oscilloscope Yes TDS 420A TDS 430A amp TDS 460A Service Manual Does the oscilloscope power up normally No The A01 Backplane was Repeat the procedure or contact your local bad Tektronix service center Figure 6 51 12 Isolation Troubleshooting Procedure Yes The A03 CPU board was bad
183. istics Table 1 17 Typical Characteristics Signal Acquisition System Cont Name Description Step Response Settling Error Volts Div Setting Step Ampli Settling Error 26 tude 20 ns 20 ms 1 mV div 99 5 mV div lt 2V lt 0 5 lt 0 1 100 mV div 995 mV div lt 20 V lt 2 0 lt 0 2 1 V div 10 V div x200 V lt 2 0 lt 0 2 1 Net Offset Offset Position x Volts Div Net Offset is the voltage level at the center of the A D converter dynamic range Offset Accuracy is the accuracy of this voltage level 2 The samples must be acquired under the same setup and ambient conditions 3 ADL digitization level is the smallest voltage level change that can be resolved by the 8 bit A D Converter with the input scaled to the volts division setting of the channel used Expressed as a voltage a DL is equal to 1 25 of a division times the volts division setting values given are the maximum absolute difference between the value at the end of a specified time interval after the mid level crossing of the step and the value one second after the mid level crossing of the step expressed as a percentage of the step amplitude Table 1 18 Typical Characteristics Time Base System Name Description Aperture Uncertainty For real time or interpolated records having duration 1 minute lt 50 ps 0 03 ppm x Record Duration RMS For equivalent time records lt 50 ps 0 06 ppm x WI RMS Fix
184. it is assigned to control the general purpose knob varies numerical readouts positions objects cursors on screen or selects between icon label settings that show up in side menu labels The general purpose knob has a readout area at the upper right corner of the screen See Figure 2 1 This readout always reflects the name and value of the function that the general purpose knob is currently controlling The general purpose knob is affected by the SHIFT button Pressing shift toggles the knob between its fine and coarse modes Fine mode is used for most adjustments coarse mode is used to traverse large parts of the adjustment range in less time Whenever the general purpose knob assignment is changed a knob icon appears immediately to the left of the general purpose knob readout to notify you of the assignment change The icon is removed as soon as you use the general purpose knob to change the value of the function it is assigned to To assign the general purpose knob to control a function display the menu containing the function then select the function Note that the general purpose knob cannot control all functions TDS 420A TDS 430A amp TDS 460A Service Manual Operating Information Whenever the menu is removed the general purpose knob is not assigned and does not control a function An exception is the cursor function If cursors are turned on removing the menu leaves the knob assigned to control the cursors until
185. its for Trigger level Threshold accuracy a Select the Delayed time base Press HORIZONTAL MENU Press the main menu button Time Base Press the side menu buttons Delayed Only and Delayed Triggerable Set D delayed horizontal SCALE to 500 us TDS 420A TDS 430A amp TDS 460A Service Manual 4 39 Performance Tests b Select the Delayed trigger system Press SHIFT then press the front panel button DELAYED TRIG W Press the main menu button Level c Measure the test signal Press the side menu button SET TO 50 Read the measurement results in the side menu below the label Level d Check against limits Do the following subparts in the order listed m Subtract the trigger level readout from the DC calibration generator setting The result is the trigger level accuracy m CHECK that the trigger level is accurate to within 18 mV ps Press TRIGGER MENU Press the main menu button Slope then press the side menu button for negative slope See icon at left m Subtract the trigger level readout from the DC calibration generator setting The result is the trigger level accuracy m CHECK that the trigger level is accurate to within 18 mV 4 Disconnect the hookup a First set the output of the DC calibration generator to 0 volts b Then disconnect the cable from the generator output at the input connector of CH 1 Sensitivity Edge Trigger Equipment DC Coupled Required One sine wave generator
186. l Processor reads the front panel switches and pots Any changes in their settings are reported to the processor system The Front Panel Processor also turns the LEDs on and off generates the bell signal and generates the probe compensation signal PROBE ADJ The Front Panel Processor also processes the probe coding interface signals The ON STBY switch is not read by the Front Panel Processor The signal passes through the A06 Front Panel board to the A03 CPU board There it s converted to a control signal for the low voltage power supply Rear Panel The GPIB connector provides access to stored waveforms and allows external control of the oscilloscope Other connectors accessible from the rear panel are the AUX TRIGGER EXT CLOCK and VIDEO Aux Power 010100 B079999 instruments only The A07 Auxiliary Power circuitry includes the principal power switch fuse line trigger transformer and line filter It also distributes power to the monitor and fan Power Factor Module 080000 and up instruments The Power Factor Module produces high voltage DC for delivery to the Low Voltage Power Supply Module input Power is taken from the AC input by drawing current in a waveshape similar to and in phase with that of the voltage waveshape AC input connector fuse and line trigger are included on this module TDS 420A TDS 430A amp TDS 460A Service Manual 3 3 Theory of Operation Low Voltage Power 3 4 Supply Fan Battery The low
187. l should perform service procedures Use Proper Power Cord To avoid fire hazard use only the power cord specified for this product Avoid Electric Overload To avoid electric shock or fire hazard do not apply a voltage to a terminal that is outside the range specified for that terminal Avoid Electric Shock To avoid injury or loss of life do not connect or disconnect probes or test leads while they are connected to a voltage source Ground the Product This product is grounded through the grounding conductor of the power cord To avoid electric shock the grounding conductor must be connected to earth ground Before making connections to the input or output terminals of the product ensure that the product is properly grounded Do Not Operate Without Covers To avoid electric shock or fire hazard do not operate this product with covers or panels removed Use Proper Fuse To avoid fire hazard use only the fuse type and rating specified for this product Do Not Operate in Wet Damp Conditions To avoid electric shock do not operate this product in wet or damp conditions Do Not Operate in an Explosive Atmosphere To avoid injury or fire hazard do not operate this product in an explosive atmosphere Use Proper Power Source Do not operate this product from a power source that applies more than the voltage specified Provide Proper Ventilation To prevent product overheating provide proper ventilation Do Not Operate With Susp
188. lding a static charge should be allowed on the work station surface 6 Handle circuit boards by their edges when possible 7 Do not slide the modules over any surface 8 Avoid handling modules in areas that have a floor or work surface covering capable of generating a static charge 9 Do not use high velocity compressed air when cleaning dust from modules TDS 420A TDS 430A amp TDS 460A Service Manual Maintenance Susceptibility to ESD Table 6 1 lists the relative susceptibility of various classes of semiconductors Static voltages of 1 kV to 30 kV are common in unprotected environments Table 6 1 Relative Susceptibility to Static Discharge Damage Semiconductor Classes MOS or CMOS microcircuits or discrete circuits or linear microcircuits with MOS inputs most sensitive ECL Schottky signal diodes Schottky TTL High frequency bipolar transistors JFET Linear microcircuits Low power Schottky TTL TTL least sensitive resistance of 100 ohms Relative Susceptibility Levels 1 1 oO SY wy 9 1 Voltage equivalent for levels voltage discharged from a 100 pF capacitor through 1 100 to 500 V 6 600 to 800 V 2 200 to 500 V 7 400 to 1000 V est 3 250 V 8 900 V 4 500V 9 1200 V 5 400 to 600 V TDS 420A TDS 430A amp TDS 460A Service Manual 6 3 Maintenance Inspection and Cleaning General Care Inspection and Cleaning 6 4 Procedures
189. m 18 55 in oscilloscope only 490 mm 19 28 in with optional front cover installed 569 mm 22 4 in with handle fully extended Rackmount digitizing oscilloscope Height 178 mm 7 0 in Width 483 mm 19 0 in Depth 472 mm 18 6 in without front panel handles 517 mm 20 35 in with front panel handles installed 1 12 TDS 420A TDS 430A amp TDS 460A Service Manual Nominal Traits 471 mm 327 2 mm 18 55 in ji 12 88 in S 000000 0 308 1 mm 12 13 in Figure 1 1 TDS 400A Dimensional Drawing TDS 420A TDS 430A amp TDS 460A Service Manual 1 13 Nominal Traits 1 14 TDS 420A TDS 430A amp TDS 460A Service Manual aa Warranted Characteristics This section lists the various warranted characteristics that describe the TDS 400A Digitizing Oscilloscopes Included are electrical and environmental characteristics Warranted characteristics are described in terms of quantifiable performance limits which are warranted This section lists only warranted characteristics A list of typical characteristics starts on page 1 23 NOTE In these tables those warranted characteristics that are checked in the procedure Performance Tests on page 4 15 appear in boldface type under the column Name Performance Conditions The electrical characteristics found in these tables of warranted
190. m Set video generator to NTSC format m Set the output of the generator for a five step ramp with color burst m Press SET TO 50 Use the trigger MAIN LEVEL knob to stabilize the display as required W Press TRIGGER MENU Press the main menu button Mode amp Holdoff Then press the side menu button Normal b Fine adjust the sync pulse amplitude The amplitude of the TV waveform should now be about 2 divisions pk pk Do the following subparts to fine adjust the vertical gain until the sync pulses measure exactly 0 6 divisions peak to peak using the graticule m Press VERTICAL MENU Press the main menu button Fine Scale Use the General Purpose knob adjust the fine gain until the sync pulse amplitude is 0 6 divisions measured using the graticule see Figure 4 19 4 50 TDS 420A TDS 430A amp TDS 460A Service Manual Performance Tests Run 2 50MS s Sample Fine Scale 910mv chi Fine Scale B rine Scale secs Chi Adjust the sync pulse Coupling Bandwidth A RS Position Offset amplitude for 0 6 divisions be 0 910 ey olo Figure 4 19 Adjusting Sync Pulse Amplitude c Check for stable triggering against limits m Read the following definition A stable trigger is one that is consistent that is one that results in a uniform regular display
191. m is down on the work surface and its front is facing you Remove the knob s Refer to Figure 6 6 while doing the following substeps a Grasp any knob you wish to remove and pull it straight out from the front panel slightly to create some clearance between the base of the knob and the front panel Insert the tweezers between the knob and front panel and use them to remove the knob and its shaft Disassemble the knob and shaft Pull the shaft out of the knob Reinstallation a To reinstall align the inside of the knob to the end of the shaft and push it in until it snaps Insert the shaft of the assembled knob into its hole in the front panel assembly until it stops Rotate the knob while lightly pushing inwards until the shaft slips into its receptacle Push the knob all the way in to seat the knob assembly TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures When reinstalling the knobs note there are two sizes Be sure to reinstall the proper size knob in the proper location Figure 6 6 Knob and shaft removal TDS 420A TDS 430A amp TDS 460A Service Manual 6 25 Removal and Installation Procedures Line Fuse and Line Cord WARNING Unplug the line cord from the line voltage power source before continuing Failure to do so can cause death or injury 1 Assemble equipment and locate modules to be removed Have handy a flat bladed screw
192. mains constantly lit It flashes for slower settings Press TRIGGER MENU then press the main menu button Slope Press SET LEVEL TO 50 CHECK that a stable trigger is obtained for the test waveform on both the positive and negative slopes Use the side menu to switch between trigger slopes use the trigger MAIN LEVEL knob to stabilize the trigger if required m Leave the Main trigger system triggered on the positive slope of the waveform before continuing to the next step 4 42 TDS 420A TDS 430A amp TDS 460A Service Manual Performance Tests Kun 2 5065 8s El Average Edge Slope OE ARDEN E Set a signal with an amplitude atthe minimum trigger sensitivity Check for a stable trigger at both the 2 positive and negative slope settings Tooma Ma0 0ns Chi smV M Source coupling Level ode amp Edge cht D T amv Holdoff O C C3 5 Cj Figure 4 14 Measurement of Trigger Sensitivity c Check delayed trigger system for stable triggering at limits Do the following subparts in the order listed m Press HORIZONTAL MENU then press the main menu button Time Base Now press the side menu button Delayed Only Press SHIFT then press DELAYED TRIG Press the main menu button Level W Press the side menu button SET TO 50 CHECK that a stable trigg
193. manual TDS 420A TDS 430A amp TDS 460A Service Manual 8 1 Electrical Parts List 8 2 TDS 420A TDS 430A amp TDS 460A Service Manual Senn CINE E Diagrams This chapter contains the block diagram and the interconnection diagram for this oscilloscope If servicing a TDS 430A ignore all references to CH 3 and CH 4 Symbols Graphic symbols and class designation letters are based on ANSI Standard Y32 2 1975 Abbreviations are based on ANSI Y1 1 1972 Logic symbology is based on ANSI IEEE Std 91 1984 in terms of positive logic Logic symbols depict the logic function performed and can differ from the manufacturer s data A tilde preceding a signal name or an asterisk following a signal name indicates that the signal performs its intended function when in the low state Other Tektronix ANSI and military standards are also used in the preparation of diagrams by Tektronix Inc TDS 420A TDS 430A amp TDS 460A Service Manual 9 1 Diagrams 9 MENU be hego PINS 405 17 BEZEL BUTTON dol 10 vB A16 FLEX P1 J104 J106 14 PINS CL uns Shins 1 i 5 A06 FRONT PANEL 05 ATTENUATOR A1W1 CAL SIG A1W2 e cuz J20 I P2 J101 18 PINS P3 TDS 420A amp TDS 460A ONLY AUX TRIG EXT CLOCK 6 20PINS 49 ps 6V 34 PINS Ce INTRG 2 8 A25 LOW VOLTAGE PWR SUPPLY OPTION 2 Aww2 w5 4
194. ments and Signal Path Compensation This oscilloscope lets you compensate the internal signal path used to acquire the waveforms you acquire and measure By executing the signal path compensation feature SPC you optimize the oscilloscope capability to make accurate measurements based on the ambient temperature TDS 420A TDS 430A amp TDS 460A Service Manual Brief Procedures Functional Tests You must run an SPC anytime you wish to ensure that the measurements you make are made with the most accuracy possible You should also run an SPC if the temperature has changed more than 5 C since the last SPC was performed f Runthe signal path compensation Disconnect all input signals Press the main menu button Signal Path then press the side menu button OK Compensate Signal Paths NOTE Failure to run the signal path compensation may result in the oscilloscope not meeting warranted performance levels g Wait signal path compensation runs in one to three minutes While it progresses a clock icon shown at left displays on screen When compensation completes the status message updates to Pass or Fail in the main menu see step h h Confirm signal path compensation returns passed status Verify the word Pass appears under Signal Path in the main menu See Figure 4 2 2 Return to regular service Press CLEAR MENU to exit the system menus The purpose of these procedures is to confirm that this oscilloscope fun
195. move the EMI gasket from the rear of the cabinet unless it must be replaced due to damage If you are not replacing that gasket skip to step 8 When reinstalling the EMI gasket and the oscilloscope cabinet carefully follow the instructions given Unless the instructions are performed properly the oscilloscope may not meet its emissions requirements EMI 7 Remove the EMI gasket If removing the EMI gasket for replacement do the following substeps a Locate the EMI gasket to be removed in the diagram Front cover rear cover cabinet emi gasket and cabinet handle and feet removal Figure 6 8 b Look for the point where the ends of the gasket touch in the channel at the rear edge of the cabinet c Use a pair of needle nose pliers to pry up one of the ends of the gasket d Grasp the EMI gasket and gently pull it out of the its channel TDS 420A TDS 430A amp TDS 460A Service Manual 6 29 Removal and Installation Procedures 6 30 8 Reinstallation of cabinet and rear cover a If the EMI gasket was removed press the EMI gasket back into its groove at the rear edge of the cabinet When installing make sure the ends of the gasket touch but do not overlap Cut off excess length if required to prevent overlap See step 7 to reinstall the handle assembly if it was removed Do in reverse order steps 3 and 4 to reinstall the cabinet while observing the following precautions and requirements ca
196. mp TDS 460A Service Manual 6 9 Removal and Installation Procedures List of Modules Cable Removal General Instructions Summary of Procedures Chapter 10 lists all modules Usually cables are partially or completely removed as in the course of removing a module they plug into However all field replaceable cables are modules and can be replaced by doing the Access Procedure Figure 6 4 on page 6 22 shows the cables and their routing STOP READ THESE GENERAL INSTRUCTIONS BEFORE REMOVING A MODULE First read over the Summary of Procedures that follows to understand how the procedures are grouped Then read Equipment Required for a list of the tools needed to remove and install modules in this oscilloscope 33 Reference Figure 6 1 on page 6 11 Procedures refer to front rear top etc of the oscilloscope note from the figure which sides are referenced If you are disassembling this oscilloscope for cleaning go to the procedure Disassembly for Cleaning on page 6 71 If you are removing a module for service begin by doing the procedure Access Procedure page 6 13 By following the instructions in that procedure you remove the module to be serviced while removing the minimum number of additional modules The procedures are described in the order in which they appear in this section In addition you can look up any procedure for removal and reinstallation of any module in the Table of Con
197. must set both switches of the Protection switch to the unprotected position before updating the firmware Figure 6 29 shows how to set the switch After loading the firmware be sure you set both switches back to the protected position and cycle power If you want to order a firmware update see Optional Accessories in Chapter 10 Mechanical Parts List for the part number Flip both switch levers toward the board closed to enable updating of firmware Figure 6 29 Accessing the protection switch TDS 420A TDS 430A amp TDS 460A Service Manual Troubleshooting Troubleshooting Equipment Equipment listed in Tables 4 1 5 3 6 4 and 6 8 of this manual or equivalent equipment may be useful while troubleshooting this oscilloscope Construction of and set up of other troubleshooting equipment are also listed in this section Table 6 8 Troubleshooting Test Equipment Fixtures and Supplies Item Number and Description Minimum Requirements 1 Console Port 2 Computer 3 Extension cable 4 Telecommunication software 5 Oscilloscope Console Port Set Up Tektronix part number 174 2613 00 IBM PC compatible Console port to computer connection RS 232 9600 baud 200 MHz for the TDS 420A or 400 MHz for the TDS 430A and TDS 460A digitizing oscil loscope Example Tektronix part number 174 2613 00 see Figure 6 30 on page 6 79 Cross Talk TEKTRONIX TDS 430A TDS 420A
198. n of the traits of the TDS 400A Digitizing Oscilloscopes Three sections follow one for each of three classes of traits nominal traits warranted characteristics and typical characteristics General The TDS 400A Digitizing Oscilloscopes are portable four channel instruments suitable for use in a variety of test and measurement applications and systems Table 1 1 lists key features Table 1 1 Key Features of the TDS 400A Oscilloscopes Feature Digitizing rate maximum Description 100 MS s on each channel simultaneously Analog bandwidth Channels TDS 460A 400 MHz TDS 420A 200 MHz TDS 430A 400 MHz TDS 460A Four each with 8 bit resolution TDS 420A Four each with 8 bit resolution TDS 430A Two each with 8 bit resolution 30 000 samples 120 000 with option 1M Record lengths maximum Acquisition modes Sample envelope average high resolution and peak detect Trigger modes Edge With Option 05 video trigger modes include NTSC SECAM PAL and Custom Display Modes Infinite and variable persistence roll fit to screen and dual waveform zoom Storage A 1 44 Mbyte 3 5 inch DOS 3 3 or later floppy disk and NVRAM storage for saving waveforms hardcopies and setups Full GPIB programmability Hardcopy output using GPIB and with Option 13 RS 232 or Centronics ports Math Including invert add subtract multiply and with Option 2F integral differential and
199. nce level m Disconnect the sine wave generator from the digitizing oscilloscope Connect the sinewave generator to the power sensor m Note the level meter reading Set the generator to the new frequency and reference level Change the sine wave generator to the desired new frequency Input the correction factor for the new frequency into the level meter m Adjust the sine wave generator amplitude until the level meter again reads the value noted in step 3 The signal amplitude is now correctly set for the new frequency m Disconnect the sine wave generator from the power sensor Connect the sinewave generator to the digitizing oscilloscope TDS 420A TDS 430A amp TDS 460A Service Manual ae NE Adjustment Procedures Description Purpose Adjustment Interval This chapter contains information needed to adjust the TDS 420A TDS 430A and TDS 460A Digitizing Oscilloscopes The Adjustment Procedures are divided into three parts m This general information about adjusting this oscilloscope and the written procedures for installing and using the adjustment software m The TDS 420A TDS 430A amp TDS 460A Adjustment Software included with this manual Read the material in this section before using the adjustment software m Two written procedures for manually adjusting the probe and the monitor assembly Use this procedure to return the oscilloscope to conformance with its Warranted Characteristics they are
200. nd Installation Procedures J8 eight conductor J3 Fan power black and red T 15 mounting Use pliers to release Screw 1 board latches 7M ET BM J4 CRT power two conductor flex cable Press release latches in while pulling up on mount Figure 6 23 A24 Low voltage power supply removal B080000 amp up 5 Reinstallation a Perform in reverse order substeps 4a 4j reversing the removal instruc tions in each substep to reinstall the assembly Be sure to seat the board until all of the four flex locks are locked b See the following procedures to replace the modules removed by the access procedure Wm Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet page 6 27 to reinstall the cabinet and rear cover TDS 420A TDS 430A amp TDS 460A Service Manual 6 59 Removal and Installation Procedures m Line Fuse and Line Cord page 6 26 to reinstall the line cord which completes the oscilloscope reassembly A25 Low Voltage Power 1 Access the module Be sure you have performed the Access Procedure on Supply and its Mount page 6 13 and removed the modules as instructed 2 Locate modules to be removed a Use a screwdriver with a size 15 Torx tip Items 1 and 2 and a pair of duck bill pliers Item 8 b Find the low voltage power supply and if it is to be removed the power supply mount in the locator diagram In
201. ning the horizontal scale to 200 us returns the period to about five divisions c The horizontal POSITION knob positions the signal left and right on screen when rotated 3 Remove the test hookup Disconnect the probe from the channel input and the probe adjust terminal Verify the Main and Equipment Delayed Trigger Systems Required Prerequisites One P6138A probe None l Install the test hookup and preset the oscilloscope controls a Hook up the signal source Install the probe on CH 1 Connect the probe tip to PROBE ADJ on the front panel leave the probe ground uncon nected See Figure 4 3 on page 4 8 b Initialize the oscilloscope W Press save recall SETUP W Press the main menu button Recall Factory Setup m Press the side menu button OK Confirm Factory Init c Modify default settings m Press AUTOSET to obtain a viewable triggered display m Set the horizontal SCALE for the M main time base to 200 us W Press VERTICAL MENU TDS 420A TDS 430A amp TDS 460A Service Manual 4 11 Brief Procedures Press the main menu button Bandwidth then press the side menu button 20 MHz Press TRIGGER MENU Press the main menu button Mode amp Holdoff Press the side menu button Normal Press CLEAR MENU to remove the menus from the screen 2 Verify that the main trigger system operates Confirm that the following statements are true The trigger level readout for the main trigger system changes when you
202. nplug it from J4 of the backplane assembly to complete the removal 5 Reinstallation a Perform in reverse order substeps 4a 4e reversing the removal instruc tions in each substep to reinstall the assembly b Seethe following procedures in the order listed to replace modules removed by the access procedure m A08 Jumper Board Assembly D1 Bus and Board Supports on page 6 44 board supports and D1 bus only Wm Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet page 6 27 to reinstall the cabinet and rear cover m Line Fuse and Line Cord page 6 26 to reinstall the line cord which completes the oscilloscope reassembly TDS 420A TDS 430A amp TDS 460A Service Manual 6 47 Removal and Installation Procedures Mounting lt Screw Short Display Assembly im Mounting w Screw CPU Assembly Mounting w Screw Display Assembly ES D1 Bus Removed by the Access procedure 02 Display Assembly Figure 6 18 A02 Display assembly removal A09 DSP Assembly 1 Access the module Be sure you have performed the Access Procedure page 6 13 and removed the modules as instructed 2 Assemble equipment and locate modules to be removed a Have handy a screwdriver with a size 15 Torx tip Items 1 and 2 b Locate the modules to be removed in the locator diagram Internal Modules Figure 6 3 on page 6 19 3 Orient the
203. nsible for packaging and shipping the defective product to the service center designated by Tektronix with shipping charges prepaid Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service center is located Customer shall be responsible for paying all shipping charges duties taxes and any other charges for products returned to any other locations This warranty shall not apply to any defect failure or damage caused by improper use or improper or inadequate maintenance and care Tektronix shall not be obligated to furnish service under this warranty a to repair damage resulting from attempts by personnel other than Tektronix representatives to install repair or service the product b to repair damage resulting from improper use or connection to incompatible equipment c to repair any damage or malfunction caused by the use of non Tektronix supplies or d to service a product that has been modified or integrated with other products when the effect of such modification or integration increases the time or difficulty of servicing the product THIS WARRANTY IS GIVEN BY TEKTRONIX IN LIEU OF ANY OTHER WARRANTIES EXPRESS OR IMPLIED TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE TEKTRONIX RESPONSIBILITY REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUST
204. nt Qty Name amp Description Code Mfr Part No B010100 B079999 10 4 1 174 2661 00 12 CABLE SP ELEC 18 AWG AMP TK2469 174 2661 00 2 174 2282 00 1 CAASSY SP ELEC FLAT FLEX 15 8L TK2469 174 2282 00 3 276 0849 00 2 CORE EM EMI SUPPRESS RBN CA RECTANGLE 1JJ96 833 5 8 6 5 SLOT 27 4 253 0176 00 1 TAPE PRESS SENS VINYL FOAM 0 5 X 0 062 2K262 ORDER BY DESC 5 174 2283 00 2 CAASSY SP ELEC FLAT FLEX 11 0L TK2469 174 2283 00 6 174 2373 00 1 2 CAASSY SP ELEC 2 18 AWG 2 0 L TK2469 174 2373 00 S 174 2288 00 1 CAASSY SP ELEC DESCETE PSC 3 5L TK2469 174 2288 00 8 210 0457 00 2 NUTPLASSEM WA 6 32 X 0 312 STL CD PL TK0435 ORDER BY DESC 9 174 2631 00 1 CABLE ASSY PWR 1460 18 AWG TK2469 174 2631 00 10 174 2281 01 1 CAASSY SP ELEC 50 28 AWG 2 3 L FLAT CABLE TK2469 ORDER BY DESC 11 174 2280 00 1 CAASSY SP ELEC FLAT FLEX 1 7L TK2469 174 2280 00 12 174 2278 00 12 CAASSY SP ELEC FLAT FLEX 2 5L TK2469 174 2278 00 13 174 3135 00 1 CABLE ASSY SP FLAT FLX 26 1MM 15 0L 80009 174313500 DISK DRIVE 14 174 2284 00 1 CAASSY SP ELEC FLAT FLEX 8 8L 80009 174228400 10 12 TDS 420A TDS 430A amp TDS 460A Service Manual Figure 10 4 Cables and routing B010100 B079999 10 13 TDS 420A TDS 430A amp TDS 460A Service Manual Fig amp Tektronix Serial No Mfr Index No Part No Effective Dscont Qty Name amp Description Code Mfr Part No
205. nt panel button that corresponds to the channel you are to confirm m Move the leveled output of the sine wave generator to the channel you select TDS 420A TDS 430A amp TDS 460A Service Manual Performance Tests Table 4 3 Analog Bandwidth TDS 420A Match the trigger source to the channel selected W Press TRIGGER MENU Press the main menu button Source Press the side menu button that corresponds to the channel selected Set the input impedance of the channel Press VERTICAL MENU then press the main menu button Coupling m Press the side menu button Q to toggle it to the 50 Q setting Set the vertical scale Set the vertical SCALE to one of the settings listed in Table 4 3 TDS 420A or Table 4 4 TDS 430A and TDS 460A not yet checked Start with the 100 mV setting Vertical Scale Reference Amplitude Horizontal Scale Test Frequency Limits 100 mV 600 mV 6 divisions 5 ns 200 MHz 2424 mV 1V4 2 V 2 divisions 5ns 200 MHz 21 414 V 500 mV 2 V 4 divisions 5ns 200 MHz 21 414 V 200 mV 1 2 V 6 divisions 5 ns 200 MHz 2048 mV 50 mV 300 mV 6 divisions 5 ns 200 MHz 2212 mV 20 mV 120 mV 6 divisions 5ns 200 MHz gt 84 mV 10 mV 60 mV 6 divisions 5 ns 200 MHz 242 mV 5mV 30 mV 6 divisions 5ns 200 MHz 221 mV 2 mV 12 mV 6 divisions 5ns 150 MHz z8 4 mV 1mV 6 mV 6 divisions 5ns 95 MHz 24 2 mV If the oscilloscope does not trigger in step 2e change the trigger coupling to DC for thi
206. ntains general information critical to safe and effective servicing of this oscilloscope the manual service strategy and a description of repair and warranty services available from Tektronix This manual is for servicing the TDS 420A TDS 430A amp TDS 460A Digitizing Oscilloscopes To prevent injury to yourself or damage to the oscilloscope do the following before you attempt service m Be sure you are a qualified service person m Read the safety summaries found at the beginning of this manual m Read Strategy for Servicing and Supplying Operating Power in this subsection When using this manual for servicing be sure to heed all warnings cautions and notes STOP If servicing a TDS 430A follow the procedures for the TDS 420A but ignore all references to CH 3 and CH 4 STOP Throughout this manual any field replaceable component assembly or part of this oscilloscope is referred to generically as a module This manual contains all the information needed for periodic maintenance of your oscilloscope Examples of such information are procedures for checking performance and for readjustment Further it contains all information for corrective maintenance down to the module level This means that the proce dures diagrams and other troubleshooting aids help isolate failures to a specific module rather than to components of that module Once a failure is isolated replace the module with a fully tested module obtain
207. o replace the modules removed by the access procedure m Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet page 6 27 to reinstall the cabinet and rear cover m Line Fuse and Line Cord page 6 26 to reinstall the line cord which completes the oscilloscope reassembly 6 66 TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures 07 Auxiliary Power 1 Access the module Be sure you have performed the Access Procedure on Supply page 6 13 and removed the modules as instructed B010100 B079999 2 Assemble equipment and locate modules to be removed a Have handy a screwdriver with a size T 15 Torx tip Items 1 and 2 and a inch nut driver Item 9 b Locate the auxiliary power supply in the locator diagram Internal Modules Figure 6 3 on page 6 19 3 Orient the digitizing oscilloscope Set the digitizing oscilloscope so its bottom is down on the work surface and its rear is facing you 4 Remove the auxiliary power supply Reference Figure 6 27 while doing the following substeps a Unplug the monitor power cable at J4 the fan power cable at J3 the cable from the backplane assembly at J7 and the cable from the low voltage power supply assembly at J1 of the low voltage power supply assembly b Using a 6 inch nut driver remove the nut s that secure the cable from the lug and remove it When replacing the cables on the ground lug install the cable from the l
208. of the circuit board and then pull the board away from the assembly until it unplugs from J405 See Figure 6 13 c Liftthe circuit board away from the rest of the assembly 6 36 TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures d Hand disassemble the front panel assembly components using Fig ure 6 13 as a guide Reverse the procedure to reassemble using the same Figure 6 13 as a guide Front Panel Board NS x Menu Button SN amp ESD Shield gt r 22 S SS n M Li Press latch to release Knobs and Shafts Flex the latches 3 downward to release board Then rotate the board and pull it down Figure 6 13 Disassembly of the front panel assembly STOP Perform step 8 only if replacing a failed or damaged menu flex circuit with a fresh unit from the factory Removal of the circuit is likely to destroy it If such is not the case skip to step 9 to continue this procedure 8 Remove the menu flex circuit Pull the flex circuit away from the front of the main chassis The flex circuit is held on by its sticky backing TDS 420A TDS 430A amp TDS 460A Service Manual 6 37 Removal and Installation Procedures 6 38 9 Reinstallation a If the menu flex circuit was removed in step 8 do the following subparts to install a new circuit reference
209. of the front panel assembly 6 37 Figure 6 14 A05 Attenuator removal 6 40 Figure 6 15 A26 Monitor assembly removal 6 43 Figure 6 16 A08 Jumper board assembly D1 Bus and board supports removal 6 44 Figure 6 17 A03 CPU removal 6 46 Figure 6 18 A02 Display assembly 6 48 Figure 6 19 A09 DSP assembly removal 6 49 Figure 6 20 A01 Backplane assembly and its mount removal 6 51 Figure 6 21 Battery 1 6 54 Figure 6 22 Power factor correction module removal B080000 amp up 6 56 Figure 6 23 A24 Low voltage power supply removal 080000 amp up 6 59 Figure 6 24 A25 Low voltage power supply removal B010100 079999 6 61 Figure 6 25 Fan and fan mount 6 64 iv TDS 420A TDS 430A amp TDS 460A Service Manual Table of Contents Figure 6 26 Line filter 6 65 Figure 6 27 Auxiliary power supply removal B010100 079999 6 68 Figure 6 28 A04 Acquisition Board Removal 6 70 Figure 6 29 Accessing the protection switch 6 76 Figure 6 30 Console port connections
210. ollows m Eight MHz clock speed or faster m MSDOS 3 2 or higher m 640K Resident RAM with 580K available A hard drive m A high density floppy drive 3 5 inch 1 44 M or 5 25 inch 1 2 M A GPIB board National Instruments GPIB PCII GPIB PCIIA or GPIB PCII IIA A PC GPIB package that includes the is available Tektronix part number S3FG210 m Suitable keyboard and monitor Installation of a math coprocessor in your system is strongly recommended to decrease the time required to adjust the oscilloscope The equipment list on page 5 5 lists all test equipment required to adjust this oscilloscope The following topics cover what is required of you when adjusting the oscillo scope and what is done by the software Also the performance of individual adjustments is discussed When using the adjustment software you are not required to manually adjust any circuits The software adjusts the circuits using external standards you provide in response to prompts on the computer screen Your role is to provide those test signals and to prompt the computer to continue Since the probe and monitor assembly adjustments require manual adjustment of circuit components they are not part of the adjustment software Written procedures for these adjustments begin on page 5 10 A complete adjustment is the performance of all adjustments contained in the Adjustment Software plus the probe adjustment on page 5 10 Therefore
211. ontains procedures for removal and installation of all mechanical and electrical modules Any electrical or mechanical module assembly or part listed in Chapter 10 of this manual is a module Preparation Please Read A WARNING Before doing this or any other procedure in this manual read the Safety Summary found at the beginning of this manual Also to prevent possible injury to service personnel or damage to oscilloscope components read Before Servicing page xvi Supplying Operating Power page 2 1 and Preventing ESD in this chapter This section contains the following information This preparatory information that you need to properly do the procedures that follow A list of equipment required to remove all modules Procedures for removal and reinstallation of the electrical and mechanical modules A disassembly procedure for removal of all the major modules from the oscilloscope at one time and for reassembly of those modules into the oscilloscope A complete disassembly is normally only done when complete ly cleaning the oscilloscope Instructions for doing the actual cleaning are found under Inspection and Cleaning beginning on page 6 4 Three module locator diagrams for finding all the modules in this oscillo scope WARNING Before doing any procedure in this section disconnect the power cord from the line voltage source Failure to do so could cause serious injury or death TDS 420A TDS 430A a
212. or TDS 460A Purpose Troubleshooting using the Console Port Troubleshooting using the Console Port Troubleshooting using the Console Port Troubleshooting using the Console Port General troubleshooting The console port allows you to see detailed diagnostic messages when faults in the oscilloscope prevent display of the normal diagnostics Use this procedure to set up the console port NOTE You may need a DB 9 to DB 25 adaptor null modem adaptor gender changer adaptor and an extension cable to connect the console port to your personal computer see Figure 6 30 on page 6 30 Using Table 6 9 as a guide you can wire a cable to take the place of a DB9 to DB25 adaptor null modem adaptor gender changer and an extension cable 1 Equipment required Console port Item 1 a personal computer or terminal Item 2 and telecommunication terminal software Item 4 for the personal computer Your personal computer may also require a DB 9 to DB 25 adaptor null modem adaptor gender changer adaptor and an extension cable to connect the console port to your personal computer see Figure 6 30 on page 6 79 2 Prerequisites Power off the oscilloscope TDS 420A TDS 430A amp TDS 460A Service Manual 6 77 Troubleshooting 3 Accessing J3 Using the Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet disassembly procedure remove the cabinet Table 6 9 Connections for a 9 to 25 P
213. or electrical equipment for measurement control and laboratory use ISA S82 02 01 1999 Safety standard for electrical and electronic test measuring controlling and related equipment IEC61010 1 A2 1995 Safety requirements for electrical equipment for measurement control and laboratory use Terminals on this product may have different installation overvoltage category designations The installation categories are CAT III Distribution level mains usually permanently connected Equipment at this level is typically in a fixed industrial location CAT II Local evel mains wall sockets Equipment at this level includes appliances portable tools and similar products Equipment is usually cord connected CATI Secondary signal level or battery operated circuits of electronic equipment A measure of the contaminates that could occur in the environment around and within a product Typically the internal environment inside a product is considered to be the same as the external Products should be used only in the environment for which they are rated Pollution Degree 2 Normally only dry nonconductive pollution occurs Occasionally a temporary conductivity that is caused by condensation must be expected This location is a typical office home environment Temporary condensation occurs only when the product is out of service Safety Class Class 1 as defined in IEC 1010 1 Annex H grounded product TDS 420A TDS
214. ormance Verification Procedures 4 2 Each procedure consists of as many steps and substeps as required to do the test Steps and substeps are sequenced as follows l First Step a First Substep b Second Substep 2 Second Step In steps and substeps the lead in statement in italics instructs you what to do while the instructions that follow tell you how to do it in the example step below Initialize the oscilloscope by doing Press save recall SETUP Now press the main menu button Initialize the oscilloscope Press save recall SETUP Now press the main menu button Recall Factory Setup then the side menu button OK Confirm Factory Init Where instructed to use a front panel button or knob or select from a main or side menu or verify a readout or status message the name of the button or knob appears in boldface type press SHIFT then ACQUIRE MENU press the main menu button Coupling or verify that the status message is Pass STOP This symbol is accompanied by information you must read to do procedures properly m Refer to Figure 4 1 Main menu refers to the menu that labels the seven menu buttons under the display side menu refers to the menu that labels the five buttons to the right of the display TDS 420A TDS 430A amp TDS 460A Service Manual Performance Verification Procedures Brief Status Information General Purpose Knob Readout 2
215. oscope functions properly A standard accessory probe included with this oscilloscope is the only equipment required Self Tests This procedure uses internal routines to verify that this oscilloscope functions and passes its internal self tests and signal path compensations It also confirms that the oscilloscope was adjusted properly at the time it was last adjusted No test equipment or hookups are required Verify Internal Adjustment Equipment Self Compensation and Required Diagnostics Prerequisites None Power on the digitizing oscilloscope and allow a 20 minute warm up before doing this procedure l Verify that internal diagnostics pass Do the following substeps to verify that the internal diagnostics passed a Display the system diagnostics menu m Press SHIFT then press UTILITY m Repeatedly press the main menu button System until Diag Err is highlighted in the menu that pops up m Repeatedly press the main menu button Area until is highlighted in the menu that pops up b Run the system diagnostics Press the main menu button Execute then press the side menu button OK Confirm Run Test c Wait The internal diagnostics do an exhaustive verification of proper oscilloscope function This verification takes up to two minutes While it progresses a variety of test patterns flash on screen When finished the resulting status appears on the screen d Confirm no failures are found Verify that no failur
216. ose knob to enter an event count of 325 events m Verify that the trigger READY indicator on the front panel flashes about once every second as the waveform is updated on screen 4 Remove the test hookup Disconnect the standard accessory probe from the channel input and the probe adjust terminal Verify the File System Equipment Required One 720 K or 1 44 Mbyte 3 5 inch DOS compatible disk formatted Prerequisites None l Preset the digitizing oscilloscope controls a Insert the disk in the disk drive b Press save recall SETUP Press the main menu button Recall Factory Setup then press the side menu button Ok Confirm Factory Init c Setthe horizontal SCALE to 200 us one click clockwise Notice the horizontal readout now displays 200 us at the bottom of the screen 2 Verify the file system works a Press save recall SETUP Press the main menu button Save Current Setup then press the side menu button To File b Turn the general purpose knob to select the file to save Choose TEK SET With this choice you will save a file starting with then containing five digits and a SET extension For example the first time you run this on a blank formatted disk or on the Example Programs Disk the digitizing oscilloscope will assign the name TEK00000 SET to your file If you ran the procedure again the digitizing oscilloscope would increment the name and call the file TEK00001 SET c Press the side menu
217. ot to push on the board components Rather push on the board edge when CAUTION When releasing the low voltage power supply from its mount take performing the following step and its substeps 4 Remove the low voltage power supply a Disconnect P2 a 22 square pin connector power supply cable coming from the backplane assembly b Disconnect P3 connector located on the low voltage power supply board c Disconnect the remaining two conductor black and red connector located on low voltage power supply board d Disconnect J3 FAN PWR two conductor black and red connector located on the small low voltage power supply board e Disconnect J7 8 conductor flex cable located on the small low voltage power supply board TDS 420A TDS 430A amp TDS 460A Service Manual 6 57 Removal and Installation Procedures f Disconnect JA CRT PWR two conductor flex cable located on the small low voltage power supply board g Working through the opening created when the fan was removed Access Procedure remove the T 15 Torx screw at the center of the power supply board h Using a pair of duck bill pliers squeeze to release each of the four flex locks at the top edge of the low voltage power supply assembly i Once released tilt the board out away from the flex locks j Liftthe low voltage power supply assembly out of the chassis to complete its removal 6 58 TDS 420A TDS 430A amp TDS 460A Service Manual Removal a
218. oved by the access procedure Wm Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet page 6 27 to reinstall the cabinet and rear cover m Line Fuse and Line Cord page 6 26 to reinstall the line cord which completes the oscilloscope reassembly 6 62 TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures Fan Fan Mount 1 Access the module Be sure you have performed the Access Procedure on page 6 13 and removed the modules as instructed 2 Assemble equipment and locate modules to be removed Locate the modules to be removed in the locator diagram Internal Modules Figure 6 3 page 6 19 3 Orient the digitizing oscilloscope Set the digitizing oscilloscope so that its bottom is down and its rear is facing you 4 Remove the fan a Unplug the power cable for the fan from J3 on the Auxiliary Power Supply b Release the two flex locks securing the top of the fan to the fan mount then lift the fan out from the top of the chassis c When reinstalling the fan be sure the two locks snap into place to secure the fan STOP DO NOT do step 5 unless servicing a broken fan mount or removing that mount for cleaning 5 Remove the fan mount a Rotate the digitizing oscilloscope so the side that houses the fan mount is facing upwards b Depress the two flex locks to release them see Figure 6 21 c While holding the flex locks released slide the
219. ower 1 TDS 420A TDS 430A amp TDS 460A Service Manual Troubleshooting 0000000000 S dooooooooo TETE E Aa J B E 0000000000 0000000000 PRT ATT TEEPE HE EE ELLE HEEL EE TE TE T L I 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 L E 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 9099o99o9o9o9ooooooooooQ 90999o9oooooooooooooooooQoQoQo OJOJOJOJOJOJOJOJOJOJOJOJOJOJOJOJOJO Jodo O P1 Pin 3 Pin 1 Pin 32 Figure 6 32 A03 CPU Board Connector P1 TDS 420A TDS 430A amp TDS 460A Service Manual 6 81 Troubleshooting This procedure assumes that the oscilloscope is up and running and you can read the display Does Select the extended diagnostics menu the display report and run all the tests for additional Are any failures any errors diagnostics information see reported Diagnostics on page 6 75 The oscilloscope is ok In Table 6 10 on page 6 83 find the row containing the first failure reported on the display Select modules from the table row in numeric order starting with number 1 The table uses abbreviations for the modules Cpu A03 CPU D1 Cable D1 Bus cable Dsp A09 DSP Acq Cable B
220. p Press the side menu button OK Confirm Factory Init c Modify the default settings Press SHIFT and then ACQUIRE MENU Press the main menu button Mode then press the side menu button Average 16 Press DISPLAY Press the main menu button Graticule then press the side menu button Frame TDS 420A TDS 430A amp TDS 460A Service Manual 4 23 Performance Tests 4 24 Press MEASURE Press the main menu button Select Measurement for CHx then press the side menu button Mean You will have to press MORE several times to access the Mean measurement Set the vertical SCALE to 100 mV Press the VERTICAL MENU button and then the Offset main menu button Set the offset to Set the vertical POSITION to 0 V 2 Confirm input channels are within limits for DC delta voltage accuracy Do the following substeps test CH 1 first skipping substep a since CH 1 is already selected from step 1 a Select an unchecked channel Set the generator output to 0 V Press WAVEFORM OFF to remove the channel just confirmed from the display Press the front panel button that corresponds to the next channel you are to confirm Press MEASURE Press the main menu button Select Measurement for CHx then press the side menu button Mean You will have to press MORE several times to access the Mean measurement Move the test hook up to the channel you select Set the vertical SCALE to 100 mV Set the vertical POSITIO
221. p Dsy or D1 bus Cpu Dsp Dsy or AT bus Dsy Cpu Attn or 2 bus Attn D1 I2C bus Acq Acq Attn Fp Cpu Cpu Dsp Dsy 02 Attn Acq a TDS 420A TDS 430A amp TDS 460A Service Manual Back plane D1 Cable Acq Cable Attn Cable Attn Acq Jumper Board Front Panel Cables 6 83 Troubleshooting Use this procedure to troubleshoot the Low Voltage Power Supply Is the principal power switch 81 in the on in position No Yes Press principal power switch S1 to the on in position Is line fuse F1 ok Yes Press principal power switch S1 to the off out position Replace the fuse Press principal power switch S1 to the on in position again No Is there 90 250 VAC at J1 pins 1 and 3 on the A25 Low Voltage Power Supply Yes Are the Secondary voltages within specification see Table 6 11 and Figure 6 36 It is not an A25 Low Voltage Power Supply problem Perform the Backplane troubleshooting procedure Yes Is there 90 250 VAC at the line filter No Yes Replace the A07 Auxiliary Power board Press principal power switch S1 to the off out position Disconnect the REMOTE_S D cable J4 from the A07 Auxiliary Power board J4 connects
222. pole three terminal grounding type plug The voltage to ground earth from either pole of the power source must not exceed the 250 Vrms maximum rated operating voltage Before making connection to the power source be sure the digitizing oscillo scope has a suitable two pole three terminal grounding type plug GROUNDING This instrument is safety Class 1 equipment IEC designation All accessible conductive parts are directly connected through the grounding conductor of the power cord to the grounded earthing contact of the power plug The power input plug must be inserted only in a mating receptacle with a grounding contact where earth ground has been verified by a qualified service person Do not defeat the grounding connection Any interruption of the grounding connection can create an electric shock hazard For electric shock protection the grounding connection must be made before making connection to the oscilloscope input or output terminals A power cord with appropriate plug configuration is supplied with each digitizing oscilloscope Table 2 1 gives the color coding of the conductors in the power cord If you require a power cord other than the one supplied refer to Table 2 2 TDS 420A TDS 430A amp TDS 460A Service Manual 2 1 Installation Operating Voltage 2 2 Table 2 1 Power Cord Conductor Identification Conductor color Alternate Color Ungrounded Line Black Grounded Neutral White Grounded
223. pulse with variable amplitude of 60 V to 100 V Minimum Requirements ORE Purpose Rohde amp Schwarz SMY Sine Wave Generator Rohde amp Schwarz URV 35 Level Meter with NRV Z8 Power Sensor and RVZ Power Splitter or optionally TEKTRONIX SG 504 Leveled Sine Wave Generator with its leveling head or a TEKTRONIX SG 5030 Programmable Leveled Sine Wave Generator with its level ing head Software based adjustments Wavetek 9100 with options 100 Software based adjustments and 250 or optionally TEK and probe adjustment TRONIX PG 506A Calibration Generator Head Pulse Generator TEKTRONIX 067 0681 01 TEKTRONIX 067 0681 01 Probe adjustment Tunnel Diode Pulser 0 1 to 200 Footlamberts Tektronix J17 Photometer with Contrast adjustment 0 343 to 686 Candelas J1803 Luminance Probe Requires a TM 500 or TM5000 Series Power Module Mainframe Requires a TM5000 Series Power Module Mainframe TDS 420A TDS 430A amp TDS 460A Service Manual Adjustment Procedures Adjustment Instructions The following instructions guide you through installing the software on your system setting up the oscilloscope for adjustment and starting the adjustment of the oscilloscope by the software Hardware Installation 1 Install the proper GPIB card see System on page 5 2 Use the manual accompanying your GPIB card to install and configure that card 2 Configure the GPIB card a This software is compatible with cards confi
224. r Amplitude range 6 mVp pto2 Vp p with NRV Z8 power sensor and Trigger Sensitivity 4 16 TDS 420A TDS 430A amp TDS 460A Service Manual Performance Tests Table 4 1 Test Equipment Cont Item Number and Description Minimum Requirements Example Purpose 13 Splitter Power Frequency range DC to 1 GHz Rohde amp Schwarz RVZ Checking Analog Bandwidth Tracking gt 2 0 14 Generator Function Frequency range 5 MHz to 10 MHz Tektronix CFG280 Checking External Clock Square wave transition time lt 25 ns Amplitude range 0 to 10 Vp p into 5002 15 Adapter four required Male N to female BNC Tektronix 103 0045 00 Checking Analog Bandwidth 16 Adapter Female N to male BNC Tektronix 103 0058 00 Checking Analog Bandwidth 17 Probe 10X included with A P6138A probe Tektronix P6138A Signal Interconnection this oscilloscope 18 Generator Video Signal Provides NTSC compatible outputs Tektronix TSG 1001 Checking Video Trigger Sensitivity 1 If available items 11 12 13 and 15 can be replaced by a Tektronix SG 503 and SG 504 If available a TG 501A may be used to check Sample rate and Delay time Accuracy A TM 500 or TM 5000 Series Power Module Mainframe is required If using a TG 501A you may also need a 2X attenuator 50 BNC Tektronix part number 011 0069 02 TDS 420A TDS 430A amp TDS 460A Service Manual 4 17 Performance Tests Test Record Photocopy this page and the next page and use them to r
225. r on self check If the self check passes the oscilloscope displays a passed status message and a prompt to press CLEAR MENU to continue If the self check fails the oscilloscope displays a diagnostic log that identifies the area s that failed and a prompt to press CLEAR MENU to continue See Chapter 6 Maintenance for information on diagnostics and fault isolation CAUTION DO NOT power down the oscilloscope when either running a signal path compensation or when doing any of the adjustments described in Chap ter 5 Adjustment Procedures To do so might result in the loss of internally stored adjustment constants In general do not power off the oscilloscope when doing operations that affect the data types listed in Table 2 3 Wait for the oscilloscope to finish the operation when doing adjustments saving waveforms or saving setups After operations complete wait at least four more seconds before turning the power off Improper power down or unexpected loss of power to the oscilloscope can result in corruption of non volatile RAM The following table describes the messages displayed when power is restored after an abnormal power down Table 2 3 Effects of Corrupted Data Corrupted Data Type Results Adjustment Constants m Signal Path Compensation signal path compensation is required Voltage Reference A voltage reference adjustment is required Chapter 5 High Frequency Response
226. rd Supports on page 6 44 board supports and D1 bus only m Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet page 6 27 to reinstall the cabinet and rear cover m Line Fuse and Line Cord page 6 26 to reinstall the line cord which completes the oscilloscope reassembly TDS 420A TDS 430A amp TDS 460A Service Manual 6 49 Removal and Installation Procedures 01 Backplane Assembly 1 Access the module Be sure you have performed the Access Procedure on and its Mount page 6 13 and removed the modules as instructed 2 Assemble equipment and locate modules to be removed a Have handy a screwdriver with a size T 15 Torx tip Items 1 and 2 and a flat bladed screwdriver Item 5 b Locate the modules to be removed in the locator diagram Internal Modules Figure 6 3 on page 6 19 3 Orient the digitizing oscilloscope Set the digitizing oscilloscope so its left side is down with its front facing to the left 4 Remove the backplane assembly Using Figure 6 20 as a guide perform the following substeps a There may be board brackets mounted on the rear panel that correspond to unused board slots or options in the backplane assembly For any bracket do the following subparts to remove it m Remove the 15 Torx screw s that secure s the bracket at the inside rear corner of the main chassis m Working from the rear of the oscilloscope remove the T 15 Torx screw s from the bracket s t
227. re not to bind or snag the cabinet on internal cabling redress cables an necessary m When sliding the cabinet onto the oscilloscope be sure that the ridge around the rear of the main chassis slides into the groove containing the EMI gasket on the rear of the cabinet m Install the four screws at the rear panel and tighten to 8 inch Ibs torque before installing the single screw at the left side of the cabinet Tighten this screw to 8 inch lbs If installing a new rear panel also do the following m Find the appropriate labels for your rear panel m Remove the covering from the back of the sticky back labels align them to the rear panel and press firmly to install See the procedure Line Fuse and Line Cord to reinstall the line cord which completes the oscilloscope reassembly TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures Trim Ring Menu Elastomer Menu Buttons and Front EMI Gaskets 1 Assemble equipment and locate modules to be removed a Have handy a wooden spudger Item 11 b Locate the modules to be removed in the locator diagram Cabinet and Front Panel Mounted Modules Figure 6 2 on page 6 16 2 Orient the oscilloscope Set the oscilloscope so its rear is down on the work surface and its bottom is facing you 3 Remove the front cover If it is installed grasp the front cover by its left and right edges and snap it off of the front of the oscilloscope Wh
228. reassigned by selecting another menu and function that uses the knob The general purpose knob also has a SELECT button Use the select button to toggle the knob between the control of either of the two cursors displayed when H bar or V bar cursors are turned on in the cursor menu to select the active graticule in zoom preview to traverse the file system and to enter characters when naming files Display and Utility Menus Using the techniques described for using menus you can access and change functions in the display menu and utilities menu In the Display menu you can set the following functions Intensity waveforms readouts and graticule Style of waveform display s vectors or dots intensified or non intensified samples and infinite or variable persistence Display format XY or YT Graticule format full grid crosshair frame NTSC and PAL Waveform interpolation filter and readout options From the Utility menu you can configure the GPIB port talk listen address etc and access internal routines for self diagnostics and self compensation Instructions for setting up communication over the GPIB are found in the Adjustment Procedures starting on page 5 1 TDS 420A TDS 430A amp TDS 460A Service Manual 2 15 Operating Information 2 16 TDS 420A TDS 430A amp TDS 460A Service Manual SS Theory of Operation Logic Conventions Module Overview General Input Signal Path This chapter describes
229. reinstall the line cord which completes the oscilloscope reassembly Mounting aa Screw Short CPU Assembly MEETS Mounting w Screw Unused ul Board Bracket Mounting Screw CPU Assembly A03 CPU Assembly TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures E 02 Display Assembly Access the module Be sure you have performed the Access Procedure on page 6 13 and removed the modules as instructed 2 Assemble equipment and locate modules to be removed Have handy a screwdriver with a size 15 Torx tip Items 1 and 2 Locate the modules to be removed in the locator diagram Internal Modules Figure 6 3 on page 6 19 3 Orient the digitizing oscilloscope Set the digitizing oscilloscope so its left side is down with its front facing to the left of you 4 Remove the display board Using Figure 6 18 as a guide perform the following substeps a Unplug the monitor to display cable at J2 b Remove the single T 15 Torx screw from the bracket that secures the CPU assembly at the inside rear corner of the main chassis c Remove the single T 15 Torx screw from the bracket that secures the display assembly at the inside rear corner of the main chassis d Working from the rear of the oscilloscope remove the single T 15 Torx 9 screw from the bracket that secures the display assembly to the rear of the main chassis e Grasp the board by its edge and pull outward to u
230. removed insert each button into its hole in the trim ring If the menu elastomer was removed align it over the menu button holes in the trim ring and press it in to install Avoid touching the carbon contact points on the elastomer Without installing the EMI gaskets align the trim ring to the front of the chassis and push it on to seat Be sure that both pairs of flex locks one pair each at the inside top and bottom of the trim ring snap over the edge of the chassis Do the following subparts to install the EMI gaskets see Figure 6 10 m Install the front cover on the oscilloscope the scope so its front cover is on the work surface m Align EMI gasket so it lays between any pair of adjacent flex locks along the groove between the cabinet m Using a wood spudger push the EMI gasket until it is firmly seated at the bottom of the groove It should not overlap either flex lock m Repeat the process just described to install the remaining three gaskets TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures e Ifthe trim ring installed in substep c is a new trim ring remove the covering from the back of the sticky back label align it to the trim ring see Figure 6 9 on page 6 31 and press firmly to install f Seethe following procedures to install those modules removed by the access procedure m Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet
231. rocedure m A06 Front Panel Assembly ESD Shield and Menu Flex and Probe Code Flex Circuits on page 6 35 m Trim Ring Menu Elastomer Menu Buttons and Front EMI Gaskets on page 6 31 Wm Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet page 6 27 to reinstall the cabinet and rear cover m Line Fuse and Line Cord page 6 26 to reinstall the line cord which completes the oscilloscope reassembly TDS 420A TDS 430A amp TDS 460A Service Manual 6 39 Removal and Installation Procedures p kX 3 05 Attenuator Assembly Mounting Screws 4 Attenuator Shield Figure 6 14 A05 Attenuator removal TDS 420A TDS 430A amp TDS 460A Service Manual 6 40 Removal and Installation Procedures A26 Monitor assembly NOTE The display tube and the display driver board are a single module and must be removed and replaced as such They are listed as a single module in the Replaceable Parts List 1 Access the module Be sure you have performed the Access Procedure on page 6 13 and removed the modules as instructed 2 Assemble equipment and locate modules to be removed Have handy a screwdriver with a size 15 Torx tip Items 1 and 2 Locate the module to be removed in the locator diagram Internal Modules Figure 6 3 page 6 19 3 Orient the digitizing oscilloscope Set the digitizing oscilloscop
232. rotate the trigger MAIN LEVEL knob The trigger level knob can trigger and untrigger the square wave signal as you rotate it Leave the signal untriggered Pressing SET LEVEL TO 50 triggers the signal that you just left untriggered Leave the signal triggered 3 Verify that the delayed trigger system operates a Select the delayed time base Press HORIZONTAL MENU Press the main menu button Time Base Press the side menu button Delayed Triggerable then press the side menu button Delayed Only Set the horizontal SCALE for the D delayed time base to 200 us Select the delayed trigger level menu Press SHIFT then press DELAYED TRIG Press the main menu button Level then press the side menu button Level Confirm that the following statements are true The trigger level readout for the delayed trigger system changes when you rotate the general purpose knob The general purpose knob can trigger and untrigger the square wave probe compensation signal as you rotate it Leave the signal untriggered TDS 420A TDS 430A amp TDS 460A Service Manual Brief Procedures W Pressing the side menu button Set to 50 triggers the probe com pensation signal that you just left untriggered Leave the signal triggered d Verify the delayed trigger counter Press the main menu button Delay by Time W Press the side menu button Events just below the Triggerable after Time selection Use the General Purp
233. rt connections TDS 420A TDS 430A amp TDS 460A Service Manual 6 79 Troubleshooting Press on the principal power Switch on the back of the oscilloscope No No the ON STBY button Can you hear the fan Can you hear the fan whirling Yes Yes When the oscilloscope powers on do the front panel lights come on and then go off a short time later Perform the Processor Front Panel No Yes Power off the oscilloscope and remove its cabinet using the Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet removal procedure On the A03 CPU module set the eighth switch of S1 to the open position Does the display seem to be working at all Yes Is No Do you No the display readable have a console and stable port Yes Y Perform the Console troubleshooting procedure 1 No Yes Does the oscilloscope respond correctly when the front panel buttons are pushed Perform the Yes Processor Front Panel troubleshooting procedure Does the oscilloscope power on and all the diagnostics pass Yes No Perform the Module Isolation troubleshooting procedure Power off and remove the cover using the Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet removal procedure Check all the cables coming out of the Low Voltage Po
234. ructed 2 Assemble equipment and locate modules to be removed Have handy a screwdriver with a size 15 Torx tip Items 1 and 2 Locate the line filter in the locator diagram Internal Modules Figure 6 3 page 6 19 3 Orient the digitizing oscilloscope Set the digitizing oscilloscope so its bottom is down on the work surface and its rear is facing you 4 Remove the line filter Refer to Figure 6 26 when doing the following substeps a Unplug the three connectors at the line filter b Remove the two screws mounting the line filter to the chassis Pull the filter out through the rear of the chassis to complete the removal Figure 6 26 Line filter removal TDS 420A TDS 430A amp TDS 460A Service Manual 6 65 Removal and Installation Procedures 5 Reinstallation sure to connect the neutral side of the line filter to the black striped lead and the WARNING When reconnecting the auxiliary power supply to the line filter be load side to the white striped lead It is not necessary to disconnect the earth ground from the chassis lug that it is bolted to If however you have done so be sure to install the earth lead and its nut from the line filter before installing the earth lead and its nut from the low voltage power supply a Do in reverse order substeps 4a 4b reversing the removal instructions each substep to reinstall the assembly b Seethe following procedures t
235. s Vertical Scale setting TDS 420A TDS 430A amp TDS 460A Service Manual 4 27 Performance Tests Table 4 4 Analog Bandwidth TDS 430A and TDS 460A Vertical Scale Reference Amplitude Horizontal Scale Test Frequency Limits 100 mV 600 mV 6 divisions 2 ns 400 MHz 2424 mV 1V4 2 V 2 divisions 2ns 400 MHz 21 414 V 500 mV 2 V 4 divisions 2 ns 400 MHz 21 414 V 200 mV 1 2 V 6 divisions 2 ns 400 MHz 2848 mV 50 mV 300 mV 6 divisions 2 ns 400 MHz 2212 mV 20 mV 120 mV 6 divisions 2 ns 400 MHz gt 84 mV 10 mV 60 mV 6 divisions 2 ns 400 MHz 42 5mV 30 mV 6 divisions 2 ns 400 MHz 221 mV 2 mV 12 mV 6 divisions 2 ns 250 MHz gt 8 4 mV 1mV 6 mV 6 divisions 2 ns 100 MHz 24 2 mV If the oscilloscope does not trigger in step 2e change the trigger coupling to DC for this Vertical Scale setting e Display the test signal Do the following subparts to first display the reference signal and then the test signal Press MEASURE then press the main menu button Select Measurement for CHx W Now press the side menu button more until the menu label Pk Pk appears in the side menu its icon is shown at the left Press the side menu button Pk Pk W Press CLEAR MENU m Set the sine wave generator output if necessary use 10X attenua tors so the CHx readout equals the reference amplitude in Table 4 3 TDS 420A or Table 4 4 TDS 430A and TDS 460A that corresponds to the vertical scale set in subs
236. s reached 1 mV div 99 9 mV div 300 V CAT Il derate at 20 dB decade above 10 kHz until the minimum rating of 5 V DC peak AC is reached Input Voltage Maximum DC 50 9 or AC 50 2 Coupled 5 Vnus With peaks less than or equal to 30 V TDS 420A TDS 430A amp TDS 460A Service Manual Warranted Characteristics Table 1 10 Warranted Characteristics Signal Acquisition System Cont Name Lower Frequency Limit AC Coupled Description 10 Hz when 1 coupled 200 kHz when 50 coupled Net Offset Offset Position x Volts Div Net Offset is the voltage level atthe center of the A D converter dynamic range Offset Accuracy is the accuracy of this voltage level The samples must be acquired under the same setup and ambient conditions DC Gain Accuracy is confirmed in the Performance Verification Procedure by passing the checks for Offset Accuracy and DC Voltage Measurement Accuracy Averaged Position Accuracy is confirmed in the Performance Verification Procedure by passing the checks for Offset Accuracy and DC Voltage Measurement Accuracy Averaged 5 The limits given are for the ambient temperature range of 0 C to 30 C Reduce the upper bandwidth frequencies by 2 5 MHz for each C above 30 C 6 The AC Coupled Lower Frequency Limits are reduced by a factor of 10 when 10X passive probes are used Table 1 11 Warranted Characteristics Time Base System N
237. s that show the revision level of the part For most parts in this manual you will find the letters XX in place of the revision level number Part Number Revision Level Revision Level May Show as XX A A 670 7918 03 670 7918 XX When you order parts Tektronix will provide you with the most current part for your product type serial number and modification if applicable At the time of your order Tektronix will determine the part number revision level needed for your product based on the information you provide TDS 420A TDS 430A amp TDS 460A Service Manual 10 1 Replaceable Parts Module Servicing Modules can be serviced by selecting one of the following three options Contact your local Tektronix service center or representative for repair assistance Module Exchange In some cases you may exchange your module for a reman ufactured module These modules cost significantly less than new modules and meet the same factory specifications For more information about the module exchange program call 1 800 TEK WIDE extension 6630 Module Repair and Return You may ship your module to us for repair after which we will return it to you New Modules You may purchase replacement modules in the same way as other replacement parts Using the Replaceable Parts List This section contains a list of the mechanical and or electrical components that are replaceable for the instrument Use this list to identify and order replace m
238. s the input channels up to three math waveforms and four reference waveforms are available for display A math waveform results when you specify operations such as add or invert a reference waveform results when you save a live waveform in a reference memory Horizontal System There are three horizontal display modes main only main intensified and delayed only You can select among various horizontal record length settings see Table 1 2 Table 1 2 Record Length vs Divisions per Record Divisions per Record Record Length 2 50 Points Division 120 000 2400 divs 60 000 1200 divs 30 000 600 divs 15 000 300 divs 5 000 100 divs 2 500 50 divs 1 000 20 divs 500 10 divs 1 The 60 000 and 120 000 point record lengths are available only with Option 1M If you select the Hi Res acquisition mode the maximum Option 1M record length reduces to 60 000 points TDS 420A TDS 430A amp TDS 460A Service Manual 1 3 Product Description Trigger System Acquisition Control 1 4 Both the delayed only display and the intensified zone on the main intensified display can be delayed by time with respect to the main trigger You can set both to display immediately after the delay delayed runs after main mode you can set the delayed display to display at the first valid trigger after the delay delayed triggerable mode The delayed display or the intensified zone can also be delayed by a selected number of
239. scope STOP If after doing steps 1 and 2 a module is clean upon inspection skip the remaining steps 1 Blow off dust with dry low pressure deionized air approximately 9 psi 2 Remove any remaining dust with a lint free cloth dampened in isopropyl alcohol 75 solution and rinse with warm deionized water A cotton tipped applicator is useful for cleaning in narrow spaces and on circuit boards TDS 420A TDS 430A amp TDS 460A Service Manual Maintenance 3 Ifsteps 1 and 2 do not remove all the dust or dirt the oscilloscope may be spray washed using a solution of 75 isopropyl alcohol by doing steps 4 through 8 4 Gain access to the parts to be cleaned by removing easily accessible shields and panels see Removal and Installation Procedures on page 6 9 5 Spray wash dirty parts with the isopropyl alcohol and wait 60 seconds for the majority of the alcohol to evaporate 6 Use 49 to 60 C 120 to 140 deionized water to thoroughly rinse the parts 7 Dry all parts with low pressure deionized air 8 Dry all components and assemblies in an oven or drying compartment using 52 to 65 C 125 to 150 circulating air Lubrication There is no periodic lubrication required for this oscilloscope TDS 420A TDS 430A amp TDS 460A Service Manual 6 7 Maintenance 6 8 TDS 420A TDS 430A amp TDS 460A Service Manual EDO E Removal and Installation Procedures This section c
240. se and Line Cord removing only the line cord Do the procedure listed at left removing only the module s you want to service Do Line Fuse and Line Cord removing only the line cord Do Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet removing only the rear cover and cabinet Do the procedure listed at left removing all modules including the module s you want to service Do Line Fuse and Line Cord removing only the line cord Do the Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet Do the procedure listed at left to remove the module Do Disk Drive Do Trim Ring Menu Elastomer Menu Buttons and Front EMI Gaskets Do the procedure listed at left removing all modules including the module s you want to service When doing the procedure listed at left do not remove the menu flex circuit unless it is being replaced with a new module TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures Line Cord Rear Cover Cabinet amp Mounting Screw Front Handle HO A Fuse Cap Assembly Line Fuse S E T p uec Menu Flex a M S D d Circuit DT E d DRON Ie x Elastomer Front EMI ESD Shield Gaskets 4 Menu Button Trim Ring p Front Cover optional Probe Code Flex Assembly A06 Front Panel Assembly Front Panel Front Panel Disk Knobs
241. stment Measure the Probe Equipment TDS 420A one leveled sine wave generator Item 13 Bandwidth Requied TDS 430A and TDS 4604 one leveled sine wave generator Item 14 One BNC female to BNC female adapter Item 2 One 50 Q BNC to probe tip adapter Item 3 One 6138 10X probe Item 12 l Install the test hookup and preset the oscilloscope controls a Expose the Inner Probe Tip Follow the instructions in Figure 5 4 NOTE Refer to the Sine Wave Generator Leveling Procedure on page 4 55 if your sine wave generator does not have automatic output amplitude leveling b Hook up test signal source m Connect the output of a leveled sine wave generator to a BNC female to BNC female adapter see Figure 5 5 m Connect the BNC female to BNC female adapter to a BNC to probe tip adapter 5 12 TDS 420A TDS 430A amp TDS 460A Service Manual Adjustment Procedures m Plug the probe tip from the probe on CH 1 into the BNC to probe tip adapter Pull forward to remove the 3 ground lead assembly Unscrew the ribbed 2 ferrule tip cover and pull forward to remove Pull forward to 1 remove the UN hook tip Figure 5 4 Exposing the Inner Probe Tip Leveled Sign Digitizing Oscilloscope Wave Generator Output BNC Female to BNC Female BNC to Probe Adapter v Tip Adapter Ir Figure 5 5 Initial Test Hookup c Initialize the oscilloscope W Press s
242. tage power supply board g Lift the Power Factor Module assembly up and at the same time disconnect the two conductor flex cable line trigger from the power supply 6 56 TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures h Lift the power supply mount out of the chassis to complete the removal 5 Reinstallation a When reinstalling the power supply mount be sure to press it flush against the chassis before sliding it towards the bottom of the chassis to lock b Perform steps 4a through 4h in reverse order c Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet page 6 27 to reinstall the cabinet and rear cover d Line Fuse and Line Cord page 6 26 to reinstall the line cord which completes the oscilloscope reassembly A25 Low Voltage Power 1 Access the module Be sure you have performed the Access Procedure on Supply and its Mount page 6 13 and removed the modules as instructed B080000 amp up 2 Locate modules to be removed a Use screwdriver with a size 15 Torx tip Items 1 and 2 and a pair of duck bill pliers Item 8 b Find the low voltage power supply and if it is to be removed the power supply mount in the locator diagram Internal Modules Fig ure 6 3 on page 6 19 3 Orient the digitizing oscilloscope Set the digitizing oscilloscope so its bottom is down on the work surface and its front is facing to the right care n
243. tal Controls Trigger Controls Inputs Block Block Block Special Controls Block Accesses all functions except those in the remaining three control blocks SELECT Cal SAVE RHZALL APPLICATION 7 VENU 7 ACQUIRE MENU WAVEFbRM measure HARDCOPY RUN STOP UTILITY SETUP CURSOR DISPLAY Y Coo Cur AEN C V VERTICAL HORIZONTAL ER TRIGGER POSITION Position gt MAIN LEVEL S Q OCH4 DELAYED TRIG VERTICAL HORIZONTAL TRIGGER MENU MEN U MENU 4 SCALE SETLEVEL C READY SINGLE TRIGGER ARM FORCE TRIGGER 300 V CAT IL ROBE COMP e L 1 15 500 CH 1 CH2 Ai N eVRMS CH3 CH4 f TDS 420A TDS 430A amp TDS 460A Service Manual 2 9 Operating Information 2 10 8 lt Select the waveform source s Position scale and set trigger level for waveform source s directly from the front panel Note that parentheses en closed numbers appear within the following steps Each number refers to the control s labeled with the same number in the figure that precedes the step N SELECT C AUTOSET waverorm MEASURE HARDCOPY RUN STOP OO CO COo 4 3 STATUS Grn CURSOR DISPLAY SHIFT C 1 SAVE RECALL APPLICA
244. tate that edge upwards slightly and pull the board out of its retainer slot at its opposite edge 1 As you lift the backplane assembly out of the chassis guide the backplane to attenuator and backplane to acquisition cables up through their slots in the bottom of the chassis m Lift the assembly all of the way out of the chassis to complete the removal 5 Reinstallation a Perform in reverse order substeps 4a 4m reversing the removal instructions in each substep to reinstall the assembly Observe the following precautions as you do the substeps m Be sure to guide the backplane to attenuator and backplane to acquisition cables up through their slots in the bottom of the chassis when doing step 4l m Be sure to align the board to the retainer slot when doing step 4k m Seat the board until the four retainers snap over the edge of the backplane assembly when doing substep 4j b Seethe following procedures in the order listed to replace modules removed by the access procedure m A08 Jumper Board Assembly D1 Bus and Board Supports on page 6 44 board supports and D1 bus only Wm Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet page 6 27 to reinstall the cabinet and rear cover m Line Fuse and Line Cord page 6 26 to reinstall the line cord which completes the oscilloscope reassembly 6 52 TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures Back Up
245. te that you need to replace the batteries Operating Environment Operating Temperature Ventilation Requirements A The following environmental requirements are provided to ensure proper operation and long oscilloscope life Operate the oscilloscope where the ambient air temperature is between 0 C and 50 C and store the oscilloscope at an ambient temperature from 40 C to 75 C After storage at temperatures outside the operating limits allow the chassis to stabilize at a safe operating temperature before applying power The digitizing oscilloscope is cooled by air drawn in and exhausted through its cabinet side panels by an internal fan To ensure proper cooling of the oscillo scope allow at least 50 8 mm 2 inches clearance on both sides and 19 mm 24 inch on the bottom of the digitizing oscilloscope The feet on the bottom of the oscilloscope provide the required clearance when set on flat surfaces The top of the oscilloscope does not require ventilation clearance CAUTION If air flow is restricted the power supply of the digitizing oscilloscope may temporarily shut down TDS 420A TDS 430A amp TDS 460A Service Manual 2 3 Installation Applying and Interrupting Power 2 4 Power On Power Off A Consider the following information when you power up or power down the oscilloscope or when power is interrupted due to an external power failure Upon powering on the oscilloscope runs its powe
246. tents of this manual The Access Procedure on page 6 13 first directs you to the procedure s that remove any modules that must be removed to access the module to be serviced It then directs you to the procedure to remove that module m Procedures for Module Removal and Installation on page 6 23 are the procedures for removing modules These procedures assume you have done the access procedure m Disassembly for Cleaning on page 6 71 is a procedure based on the module removal procedures just described that removes all modules for cleaning Instructions for cleaning are found in Inspection and Cleaning beginning on page 6 4 The Disassembly for Cleaning procedure does not use the access procedure TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures NOTE Read the cleaning procedure before disassembling the oscilloscope for cleaning Figure 6 1 Oscilloscope orientation TDS 420A TDS 430A amp TDS 460A Service Manual 6 11 Removal and Installation Procedures Equipment Required Table 6 4 lists the tools required to completely disassemble the oscilloscope into its modules The tools required to remove an individual module are listed in the first step of its procedure the tools are standard tools readily available from tool suppliers Table 6 4 Tools Required for Module Removal Item No 1 2 ce o Go0 Name Screwdriver handle T 15 Torx tip T 20 Torx
247. tep d W Press the front panel button SET LEVEL TO 50 as necessary to trigger a stable display f Measure the test signal Increase the frequency of the generator output leveled output to the test frequency in Table 4 3 TDS 420A or Table 4 4 TDS 430A and TDS 460A that corresponds to the vertical scale set in substep d m Setthe horizontal SCALE to 5 ns TDS 420A or 2 ns TDS 430A and TDS 460A m Press SET LEVEL TO 50 as necessary to trigger the display 4 28 TDS 420A TDS 430A amp TDS 460A Service Manual Performance Tests m Read the results at the CHx Pk Pk readout which automatically measures the amplitude of the test signal See Figure 4 7 Tek Run 25 065 s ET Average Read the results from the readout of 3 measurement Pk Pk gt 1 486mVv Set the generator frequency to the test frequency from tables 4 3 and 4 4 Set the horizontal scale from the tables 2 Bl iive it cots hi f ov Oo SSS Figure 4 7 Measurement of Analog Bandwidth g Check against limits m CHECK that the Pk Pk readout on screen is within the limits listed in Table 4 3 TDS 420A or Table 4 4 TDS 430A and TDS 460A for the current vertical scale setting When finished checking set the horizontal SCALE back to the 50 ns setting the setting you
248. ternal Modules Fig ure 6 3 on page 6 19 3 Orient the digitizing oscilloscope Set the digitizing oscilloscope so its bottom is down on the work surface and its front is facing to the right CAUTION When releasing the low voltage power supply from its mount take care not to push on the board components Rather push on the board edge when performing the following step and its substeps 4 Remove the low voltage power supply a b 6 60 Unplug the cable coming from the backplane assembly at J2 Unplug the cable coming from the AUX power supply at J1 Working through the opening created when the fan was removed Access Procedure remove the T 15 Torx 9 screw at the center of the power supply board Using a pair of duck bill pliers squeeze to release each of the four flex locks at the top edge of the low voltage power supply assembly Once released tilt the board out away from the flex locks and unplug the AC power cable where it connects to the cable from the low voltage power supply Lift the low voltage power supply assembly out of the chassis to complete its removal TDS 420A TDS 430A amp TDS 460A Service Manual Removal and Installation Procedures Mounting Use pliers to release Screw 1 ET S board latches To Aux Power Supply Press release latches in while pulling up on mount Figure 6 24 A25 Low voltage power supply removal B010100 B079999 STOP DO NOT do step
249. that the period of the displayed sine wave changes to two divisions Press CLEAR MENU 2 Disconnect the hookup Disconnect the cables from the generators at the CH 1 and AUX TRIGGER EXT CLOCK input connectors TDS 420A TDS 430A amp TDS 460A Service Manual Performance Tests Check Video Trigger Equipment Sensitivity Required Option 05 Equipped Models Only One NTSC format video generator Item 18 One 75 coaxial cable Item 6 One 75 Q terminator Item 4 See page 4 15 Prerequisites l Install the test hookup and preset the oscilloscope controls a Initialize the oscilloscope Press save recall SETUP W Press the main menu button Recall Factory Setup Press the side menu button OK Confirm Factory Init b Modify the default setup Set the vertical SCALE to 500 mV m Set the horizontal SCALE to 20 us Wm Press HORIZONTAL MENU W Press the main menu button Record Length W Press the side menu button 5000 points in 100 divs c Hook up the test signal source Connect through 75 Q precision coaxial cable followed by 75 Q terminator the output of a NTSC format video generator to CH 1 see Figure 4 18 Video Digitizing Oscilloscope Generator 750 Terminators Figure 4 18 Initial Test Hookup TDS 420A TDS 430A amp TDS 460A Service Manual 4 49 Performance Tests 2 Confirm the video trigger system is within limits a Display the test signal
250. the electrical operation of the Tektronix TDS 420A TDS 430A and TDS 460A Digitizing Oscilloscopes using the major circuit blocks or modules This chapter has two main parts Logic Conventions describes how logic functions are discused and represented in this manual m Module Overview describes circuit operation from a functional block perspective The digitizing oscilloscope contains many digital logic circuits This manual refers to these circuits with standard logic symbols and terms Unless otherwise stated all logic functions are described using the positive logic convention the more positive of the two logic levels is the high 1 state and the more negative level is the low 0 state Signal states may also be described as true meaning their active state or false meaning their non active state The specific voltages that constitute a high or low state vary among the electronic devices Active low signals are indicated by a tilde prefixed to the signal name RE SET Signal names are either active high active low or have both active high and active low states This module overview describes the basic operation of each functional circuit block as shown in Figure 9 2 on page 9 8 The digitizing oscilloscope is a portable multichannel instrument Each channel provides a calibrated vertical scale factor All channels can be acquired simulta neously A signal enters the oscilloscope through a probe connected to a BN
251. to 950 nm DC to 250 MHz 5 V mW 1100 to 1700 nm DC to 300 MHz 5 V mW TDS 420A TDS 430A amp TDS 460A Service Manual Options and Accessories Accessory Software Table 7 5 lists optional accessories that are Tektronix software products recommended for use with your digitizing oscilloscope Table 7 5 Accessory Software Software Part Number Wavewriter AWG and waveform creation 53 400 LabWindows for DOS LWDOS for CVI LWCVI WaveStar WSTRS1 Warranty Information warranty statement for this product is after the title page of this manual Service Assurance Tektronix offers the following services that you can purchase any time during the warranty period of this product m Repair Service Assurance provides one year of post warranty repair support It is available in one year increments up to two years m CAL Calibrate Service Assurance provides one year of calibration support It is available in one year increments up to five years For further information contact your Tektronix Representative TDS 420A TDS 430A amp TDS 460A Service Manual 7 5 Options and Accessories 7 6 TDS 420A TDS 430A amp TDS 460A Service Manual ERES INE cce Electrical Parts List The modules that make up this instrument are often a combination of mechanical and electrical subparts Therefore all replaceable modules are listed in Chap ter 10 Mechanical Parts List Refer to that chapter for part numbers when using this
252. to do a TDS 420A TDS 430A amp TDS 460A Service Manual Adjustment Procedures Individual Adjustments Partial Adjustment Adjustment After Repair complete adjustment do all adjustments in the software completely and in sequence and then do the written probe adjustment procedure Throughout this chapter complete adjustment is used as just defined Note that the procedure Monitor Assembly Adjustment page 5 21 is not required to do a complete adjustment The adjustment software contains a sequence of individual adjustments The list of those adjustments follows m Signal Path Compensation m Voltage Reference Adjustment m High Frequency Response Adjustment TDS 430A and TDS 460A only Low Frequency Response Adjustment m Trigger Skew Adjustment All these software based adjustments are made internally by the adjustment software and all adjustments are done without removal of the oscilloscope cabinet The adjustment software allows you to make individual adjustments However usually all adjustments are made unless you are adjusting circuits in the course of troubleshooting the oscilloscope Read the information under Complete Adjustment page 5 2 Adjustment After Repair page 5 3 and Adjustment Dependencies page 5 4 before doing an individual adjustment After the removal and replacement of a module due to electrical failure you either must do a complete adjustment or no adjustment is required depending on
253. ts Option 95 With this option Tektronix ships a test data report for the oscilloscope At Depot Service Tektronix offers several standard priced adjustment calibra tion and repair services A single repair or adjustment m Calibrations using equipment and procedures that meet the traceability standards specific to the local area Annual maintenance agreements that provide for either calibration and repair or calibration only of the oscilloscope Of these services the annual maintenance agreement offers a particularly cost effective approach to service for many owners of the TDS 400A Digitizing Oscilloscopes You can purchase such agreements to span several years Tektronix supports repair to the module level by providing Module Exchange and Module Repair and Return TDS 420A TDS 430A amp TDS 460A Service Manual xvii Introduction Module Exchange This service reduces down time for repair by allowing you to exchange most modules for remanufactured ones Tektronix ships you an updated and tested exchange module from the Beaverton Oregon service center typically within 24 hours Each module comes with a 90 day service warranty For More Information Contact your local Tektronix service center or sales engineer for more information on any of the repair or adjustment services just described xviii TDS 420A TDS 430A amp TDS 460A Service Manual Product Description This Chapter begins with a general descriptio
254. tton Ref 2 m Measure the delay between CH 1 and Ref 2 using the method described in substep f above m CHECK that the cursor readout on screen is lt 200 ps m If you testing a TDS 430A skip to step 3 m Press WAVEFORM OFF twice to turn off CH 1 and Ref 2 then press CH 4 to turn on CH 4 m Press MORE then press the main menu button Ref 3 to display the CH 3 waveform stored in Ref 3 m Measure the delay between Ref 3 and CH 4 using the method described in substep f above m CHECK that the cursor readout on screen is lt 200 ps TDS 420A TDS 430A amp TDS 460A Service Manual 4 33 Performance Tests 3 Disconnect the hookup Disconnect the cable from the generator output at the input connectors of the channels Time Base System Checks These procedures check those characteristics that relate to the Main and Delayed time base system and are listed as checked under Warranted Characteristics in Chapter 1 Specification Check Accuracy for Equipment One time standard either a frequency accurate sine wave generator or Long Term Sample Rate Required time marker generator Item 11 Delay Time and Delta Attenuators 10X and 5X Items 1 and 2 Time Measurements One precision coaxial cable Item 5 Prerequisites See page 4 15 l Install the test hookup and preset the oscilloscope controls a Hook up the test signal source Connect through a 50 Q precision coaxial cable the output of a time standard to CH
255. u begin step 4 4 Start the adjustment software a b c Change drives to your hard drive Change directories to TDS400A ADJ Type ADJ400A TDS 420A TDS 430A amp TDS 460A Service Manual Adjustment Procedures d Follow the instructions as prompted on your computer screen NOTE The adjustment software prompts you to enter the ambient temperature Enter the exact ambient temperature within 1 C Failure to enter the temperature as just specified results in an adjustment of the oscilloscope that can degrade oscilloscope performance across the specified operating temperature range 5 When adjustment is completed a To doa complete adjustment as defined on page 5 2 do the procedure Probe Adjustment on page 5 10 TDS 420A TDS 430A amp TDS 460A Service Manual 5 9 Adjustment Procedures Probe Adjustment Compensate the Probe Probe adjustment is divided into three parts Compensate the Probe Measure the Probe Bandwidth and Adjust the Probe High Frequency Response If probe bandwidth is within required limits do not do the high frequency response adjustment Equipment The P6138A probe Item 12 Required The probe adjustment tool included as probe accessory l Install the test hookup and preset the oscilloscope controls Digitizing Oscilloscope 55 Figure 5 1 Hookup for Probe Compensation a Hook up test signal source Install the standard accessory probe to
256. ual to 420 mV 3 Disconnect the hookup a b Unplug the probe from the BNC to probe tip adapter If substep 2b was passed the probe adjustment is finished Reverse the instructions in Figure 5 4 page 5 13 to reinstall the retractable hook probe tip TDS 420A TDS 430A amp TDS 460A Service Manual Adjustment Procedures c Ifsubstep 2b was not passed leave the probe tip exposed Remove the probe from CH 1 and go on to the next procedure Adjust the Probe High Frequency Response Adjust the Probe High not perform this procedure until you have first completed the procedures Frequency Response Compensate the Probe and Measure Probe Bandwidth on pages 5 10 and 5 12 respectively Do not perform this procedure if you have successfully completed Measure the Probe Bandwidth Probe adjustment is complete Equipment Required One pulse generator Item 15 One pulse generator head Item 16 One 50 2 precision cable Item 8 One BNC female to BNC female adapter Item 2 One 50 2 BNC to probe adapter Item 3 One P6138A 10 probe Item 12 One 10X attenuator Item 5 One probe adjustment tool included with the P6138A probe accessories l Install the test hookup and preset the oscilloscope controls a Access Inner Probe Tip and Adjustment Ports The probe tip should be exposed from the procedure Measure Probe Bandwidth not follow the instructions in Figure 5 4 to expose the probe tip
257. ure 4 13 Initial Test Hookup 2 Confirm Main and Delayed trigger systems are within sensitivity limits 50 MHz a Display the test signal m Set the generator frequency to 50 MHz Press MEASURE TDS 420A TDS 430A amp TDS 460A Service Manual 4 41 Performance Tests Press the main menu button High Low Setup then press the side menu button Min Max Press main menu button Select Measurement for Chl W Press the side menu button more until Amplitude appears in the TIE side menu its icon is shown at the left Press the side menu button Amplitude m Adjust the trigger MAIN LEVEL knob to obtain stable triggered waveform W Press CLEAR MENU m Set the test signal amplitude for about three and a half divisions on screen Now fine adjust the generator output until the CH 1 Amplitude readout indicates the amplitude is 350 mV Readout may fluctuate around 350 mV m Disconnect the 50 Q precision coaxial cable at CH 1 and reconnect it to CH 1 through a 10X attenuator b Check for Main trigger system for stable triggering at limits m Read the following definition A stable trigger is one that is consistent that is one that results in a uniform regular display triggered on the selected slope positive or negative This display should not have its trigger point switching between opposite slopes nor should it roll across the screen At horizontal scale settings of 2 ms division and faster TRIG D re
258. used in step 1b STOP Checking the bandwidth of each channel at all vertical scale settings is time consuming and unnecessary You may skip checking the remaining vertical scale settings in Table 4 3 TDS 420A or Table 4 4 TDS 430A and TDS 460A that is skip the following substep h if this digitizing oscilloscope has passed the 100 mV vertical scale setting just checked in this procedure and passed the Verify Internal Adjustment Self Compensation and Diagnostics procedure found under Self Tests on page 4 5 TDS 420A TDS 430A amp TDS 460A Service Manual 4 29 Performance Tests NOTE Passing the signal path compensation confirms the signal path for all vertical scale settings for all channels Passing the internal diagnostics ensures that the factory set adjustment constants that control the bandwidth for each vertical scale setting have not changed h Check remaining vertical scale settings against limits optional m If desired finish checking the remaining vertical scale settings for the channel under test by repeating substeps d through g for each of the remaining scale settings listed in Table 4 3 TDS 420A or Table 4 4 TDS 430A and TDS 460A for the channel under test m When doing substep e skip the subparts that turn on the CHx Pk Pk measurement until you check a new channel m nstall remove 10X attenuators between the generator leveled output and the channel input as is needed to obtain the six div
259. vide high confidence that the oscilloscope will perform properly Use these procedures as a quick check before making a series of important measurements To further check functionality first do the Se f Tests just mentioned then do the procedures under Functional Tests that begin on page 4 7 Advantages These procedures require minimal additional time to perform require no additional equipment other than a standard accessory probe and more completely test the internal hardware of this oscilloscope Use these procedures to quickly determine if the oscilloscope is suitable for putting into service such as when it is first received If more extensive confirmation of performance is desired do the Perfor mance Tests beginning on page 4 15 after doing the Functional and Self Tests just referenced Advantages These procedures add direct checking of warranted specifica tions They require more time to perform and suitable test equipment is required See Equipment Required on page 4 16 If you are not familiar with operating this oscilloscope read Operating Informa tion in Chapter 2 of this manual These instructions will acquaint you with the use of the front panel controls and the menu system Throughout these procedures the following conventions apply Each test procedure uses the following general format Title of Test Equipment Required Prerequisites Procedure TDS 420A TDS 430A amp TDS 460A Service Manual 4 1 Perf
260. wer Connector 6 97 Figure 6 49 Backplane Troubleshooting Procedure 6 98 Figure 6 50 A01 Backplane 6 100 Figure 6 51 I2C Isolation Troubleshooting Procedure 6 101 Figure 6 52 Console Troubleshooting Procedure 6 102 Figure 9 1 TDS 400A Interconnections B010100 B079999 9 2 Figure 9 2 TDS 400A Interconnections B010100 B079999 Cont 9 3 Figure 9 3 TDS 400A Block Diagram B010100 079999 9 4 Figure 9 4 TDS 400A Block Diagram B010100 B079999 Cont 9 5 TDS 420A TDS 430A amp TDS 460A Service Manual Table of Contents vi Figure 9 5 TDS 400A Interconnections B080000 amp up 9 6 Figure 9 5 TDS 400A Interconnections B080000 amp up Cont 9 7 Figure 9 6 TDS 400A Block Diagram 080000 amp up 9 8 Figure 9 6 TDS 400A Block Diagram B080000 amp up Cont 9 9 Figure 10 1 External and front panel modules 10 7 Figure 10 2 Internal modules B010100 079999 10 9 Figure 10 3 Internal modules 080000 10 11 Figure 10 4 Cables and routing B010100 B079999 10 13 Figure 10 5 Cables and routing B080000 Up 10 15 TDS 420A TDS 430A amp TDS 460A Service Manual Table of Contents List of Tables Table 1 1 Key Features of the TDS 400A Oscilloscopes 1 1 Table 1 2 Record L
261. wer Supply and the cabling between modules Be sure every cable is attached securely troubleshooting procedure first flash 8 then display Perform the Low Voltage Power Supply troubleshooting procedure There is something wrong with the ON STBY button Perform the Backplane troubleshooting procedure Does the system power on now Yes Power on again and observe LED DS1 Does it only display 8 No Does DS1 No a sequence of hex numbers from 1 e with no period preceding Yes Perform the Monitor troubleshooting procedure 1 1Note Set all the switches of S1 back to the closed position and cycle power before performing another procedure Figure 6 31 Primary Troubleshooting Procedure 6 80 Yes Is there 5 1 V on P1 pin 3 see Figure 6 32 Replace the Yes A03 CPU module 1 No Perform the Low Voltage Power Supply troubleshooting procedure 1 Replace the A03 CPU module 1 Does DS1 flash 8 then display the sequence of hex numbers pausing to flash b ue NOTE The replacement module will not have firmware loaded See 6 76 for details on firmware updates Yes Yes both switches of S2 in the open position No Set both switches of S2 on the A03 CPU module to their open positions Set all switches of S1 back to the closed position and cycle p
262. witch between opposite slopes on the waveform and the display must not roll across the screen on successive acquisitions The TRIG D LED stays constantly lighted when the SEC DIV setting is 2 ms or faster but may flash when the SEC DIV setting is 10 ms or slower Table 1 13 Warranted Characteristics Probe Compensator Output Name Description Output Voltage and Frequency Probe Compensator Characteristic Limits Voltage 0 5 V base top 5 into a 1 MQ load Frequency 1 kHz 5 Table 1 14 Warranted Characteristics Power Requirements Name Source Voltage and Frequency Description 100 to 240 VAC 1096 CAT continuous range for 50 Hz 60 Hz 115 VAC 10 CAT Il continuous range for 400 Hz Power Consumption 250 Watts TDS 420A TDS 430A amp TDS 460A Service Manual Warranted Characteristics Table 1 15 Warranted Characteristics Environmental Safety and Reliability Name Atmospherics Description Temperature Operating 0 C to 50 C disk drive operation limited to 4 C minimum Nonoperating 22 C to 60 C Relative humidity Operating without disk to 80 at or below 29 C to 20 at or below 50 C Operating with disk 2096 4 C to 50 C to 80 4 C to 429 Nonoperating 20 4 C to 60 C to 90 422 C to 40 C Altitude Operating to 15 000 ft 4570 m Nonoperating to 40 000 ft 12190 m 1 Maximum op
263. y Description Acquire Mode Trigger Position Error Sample Hi Res Average 1 WI 1 ns Peak Detect Envelope 2 WI 1 ns Main Horizontal Scale Maximum Holdoff lt 100 ns div 5 x Min Holdoff 100 ms div lis 5xMinHoldofi Otherwise 5 x Min Holdoff 0 to 100 ms Auto triggers 2 s after the last normal trigger or appropriated trigger mode is entered 20 Hz Trigger Coupling Typical Signal Level for Stable Triggering AC Same as DC coupled limits for frequencies above 60 Hz Attenuates signals below 60 Hz Noise Reject Three and one half times the DC coupled limits High Frequency Reject One and one half times the DC coupled limits from DC to 30 kHz Attenuates signals above 30 kHz Low Frequency Reject One and one half times the DC coupled limits for frequencies above 80 kHz Attenuates signals below 80 kHz Line Rate Class Four classes are provided as follows m NTSC which provides a default line rate compatible with the NTSC standard 525 60 which provides a default line rate compatible with the PAL standard 625 50 SECAM which provides a default line rate compatible with the SECAM standard 625 50 Custom which provides user selectable line rate ranges see Custom Line Rate Ranges below Custom Line Rate Ranges 15 kHz 20 kHz 20 kHz 25 kHz 25 kHz 35 kHz and 35 kHz 64 kHz Holdoff Automatically adjusts to 58 ms nominal for NTSC class to 150 ms nominal for PAL and SECAM A holdoff of
264. y should not have its trigger point switching between opposite slopes nor should it roll across the screen see Figure 4 16 Run 2 5065 s ET Samp Edge Coupling DC eee division amplitude anda 1 A d DE Set a signal with a four 10 MHz frequency du cu M M M CL M ME J HF Rej Check for a stable trigger jv ts i ERU LF Rej at both the positive and 2 MM NEM ERST negative settings MU 1 000 77 777 d 20 08s Aux A 1 507 ICO COICOICOICO Sensitivity source ESTNE Slope Level oge TYPE HS amp bbs AC Jo asov ICH ES FS So to e Figure 4 16 Confirming Auxiliary Triggering at Maximum Triggering Frequency 3 Disconnect the hookup Disconnect the cable from the generator output at the input connector of the channel last tested 4 46 TDS 420A TDS 430A amp TDS 460A Service Manual Performance Tests Check External Clock Equipment One Function generator Item 14 Required One Sine Wave generator Item 11 One 500 terminator Item 3 One N to BNC adapter Item 15 One BNC T connector Item 8 Two precision coaxial cables Item 5 Prerequisites See page 4 15 l Install the test hookup and preset the instrument controls a Initialize the oscilloscope m Press save recall SETUP Press the main menu button Recall Factory Setup Press the side menu button

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