1741C Waveform Monitor Service Manual
Contents
1. Figure 5 3 Main board replaceable components 1741C Waveform Monitor Service Manual 0155 014 F231 F232 F221 F233 F222 F234 F223 Replaceable Parts Replaceable Parts Table 5 4 Replaceable parts list Fig amp index Tektronix part Serial no Serial no number number effective discont d Oty Name amp description Standard Accessories 071 2584 xx 1 QUICK START REFERENCE 1741C 063 4185 xx 1 DOCUMENTATION CD 1741C 071 2626 xx 1 USER MANUAL TECH ENGLISH 1741C 071 2627 xx 1 USER MANUAL TECH S CHINESE 1741C See Description 1 CABLE ASSY POWER Option Country P N A0 N AMERICA 161 0066 00 A1 UNIV EURO 161 0066 09 A2 UK 161 0066 10 A3 AUSTRALIA 161 0066 13 A4 USA 240V 161 0066 12 A5 SWITZERLAND 161 0154 00 A6 JAPAN 161 A008 00 A10 CHINA 161 0304 00 11 INDIA 161 0400 00 Optional Accessories WFM7F02 CABINET PORTABLE CABINET WITH HANDLE FEET TILT BAIL AND FRONT PANEL COVER 200 4716 00 COVER FRONT PROTECTIVE PC ABS FR110 TV GRAY WFM7F05 RACK ADAPTER DUAL SIDE BY SIDE 077 0155 xx SERVICE MANUAL PDF ONLY 1741C 077 0152 xx SPECIFICATIONS amp PERFORMANCE PDF 1741 TEqui BES USA pm ent NET An Interworld Highway LLC Company 5 10 1741 Waveform Monitor Service Manual2. TEquipment An Interworld Highway LLC Company 1741C Waveform Monitor Service Manual IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII Tektronix 077 0155 02 Y 1741C Waveform Monitor Service Manual 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 Revision A www tektronix com 077 0155 02 Tektronix 7 Copyright Tektronix All rights reserved Licensed software products are owned by Tektronix or its subsidiaries or suppliers and are protected by national copyright laws and international treaty provisions Tektronix products are covered by U S and foreign patents issued and pending Information in this publication supersedes that in all previously published material Specifications and price change privileges reserved TEKTRONIX and TEK are registered trademarks of Tektronix Inc Contacting Tektronix Tektronix Inc 14150 SW Karl Braun Drive P O Box 500 Beaverton OR 97077 USA For product information sales service and technical support In North America call 1 800 833 9200 Worldwide visit www tektronix com to find contacts in your area Warranty Tektronix warrants that this product will be free from defects in materials and workmanship for a period of one 1 year from the date of shipment If any such pr
3. For installation instructions refer to the 1741C Waveform Monitor Quick Start User Manual To install product enhancements when ordered as a field upgrade refer to the instructions included with the kit Software is available at www tek com The 1741C Waveform Monitor User Manual also includes instructions for updating product software For basic operating instructions refer to the 1741C Waveform Monitor User Manual that shipped with this product 1 This product has no power switch to power it up plug it in to a line voltage source 2 Wait for the system to complete its power on self tests There are two methods to power down the waveform monitor Power Down Unplug the instrument Standby The instrument can be placed in a low power standby mode by touching the Standby power button This also saves the current instrument state as the Latest Preset which can be configured as the Power up Preset 1741C Waveform Monitor Service Manual Theory of Operation Theory of Operation The 1741C is an Analog Composite waveform monitor with four input channels The monitor uses an internal XGA monitor for the display and has an output to drive an external XGA monitor with the same display It has outputs to drive serial digital and analog picture monitors This theory of operation is mainly based on the High level Block diagram See Figure 2 1 If necessary other block diagrams may also be referenced The lower portion of
4. index Tektronix part Serial no Serial no number number effective discont d Oty Name amp description 5 1 Circuit Boards and Connectors 1 870 0258 00 2 CIRCUIT BD ASSY ANALOG COMPOSITE 389 3545 00 WIRED 2 131 7881 00 1 CONN IO PCB USB SERIES A FEMALE RTANG ON EDGE 1 X 4 2 5MM CTR 13 90 2 0 TAIL 30 GOLD W BOARD RETENTION 3 870 0337 00 1 CIRCUIT BD ASSY DUAL CHANNEL MAIN 389395500 WIRED 4 119 6801 01 1 POWER SUPPLY 110W AC DC 5VDC 22A OUT 90 264VAC 47 63HZ IN PFC 75 EFF OPEN FRAME 6 5 X 3 X 1 26 IN UL CSA VDE SAFETY CONTROLLED 5 337 4342 00 1 SHIELD POWER SUPPLY 050 AL 5052 H32 MILL FINISH 6 174 4769 00 1 CA ASSY SP HV BR 15 00 L amp 4 00 L CONN EACH END LINE FILTER TO PWR SUPPLY SAFETY CONTROLLED 7 441 2525 00 1 CHASSIS MAIN 0 050 AL SAFETY CONTROLLED 8 134 0246 00 3 PLUG HOLE COVER BUTTON PLUG 0 578 HEAD DIA X 0 406 THK ACCOM 0 5 DIA HOLE 0 015 0 125 THK PNL NYLON BLACK 94V 2 9 211 0722 00 2 SCREW MACHINE 6 32 X 0 250 PNH STL CDPL T 15 TORX DR USED WITH WFM7F02 PORTABLE CASE ONLY 10 210 0457 00 1 NUT PL ASSEM WA 6 32 X 0 312 STL CD PL W LOCKWASHER 11 211 0410 00 2 SCR ASSEM WSHR 4 40 X 0 437 PNH STL CDPL T 10 TORX DR 12 131 4131 00 1 CONN PLUG ELEC MALE W LOCKING ADPTR EXT CONTROLLED 13 211 0734 00 4 SCREW MACHINE 6 32 X 0 250 FLH100 STL CDPL T 10 TORX DR 5 2 1741 Waveform Monitor Service Manual Table 5 1 Replaceable parts list See Figure 5 1 cont Replaceable
5. laser radiation exists 1741C Waveform Monitor Service Manual General Safety Summary Terms in This Manual Symbols and Terms on the vi Product Do not operate in wet damp conditions Do not operate in an explosive atmosphere Keep product surfaces clean and dry Provide proper ventilation Refer to the manual s installation instructions for details on installing the product so it has proper ventilation 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 These terms may appear on the product m DANGER indicates an injury hazard immediately accessible as you read the marking m WARNING indicates an injury hazard not immediately accessible as you read the marking m CAUTION indicates a hazard to property including the product The following symbol s may appear on the product A A d CAUTION WARNING Protective Ground Standb Refer to Manual High Voltage Earth Terminal tandby 1741C Waveform Monitor Service Manual Service Safety Summary 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 internal ser
6. 1 CABLE ASSEMBLY 10 PIN FP TO MAIN 12 863 0262 00 1 CIRCUIT BD SUBASSY 389410200 FP ROHS COMPLIANT 13 311 2580 00 2 PB FREE ENCODER DIGITAL CONTACTING ENCODER 24 CPR NON DETENTED 6 MM DIA SHAFT 17 5 MM LENGTH SHAFT 14 260 2882 00 1 SWITCH KEYPAD ELASTOMERIC 1741C 15 426 2631 00 1 FRAME FRONT BEZEL PC ABS TV GRAY SAFETY CONTROLLED 16 211 0119 00 2 SCREW MACHINE 4 40 X 0 25 FLH 100 DEG STL BK OXD POZ 17 335 2046 00 1 LABEL FRONT PANEL LEXAN 1741C 18 366 0859 01 3 ASSEMBLY KNOB 470 DIAMETER SOFT TOUCH 19 335 2047 00 1 LABEL MARKER IDENTIFICATION LEXAN 1741C SAFETY CONTROLLED 20 311 2607 00 1 ENCODER DIGITAL CONTACTING ENCODER 24 CPR 24 DETENTS 6 MM DIA SHAFT 17 5 MM LENGTH SHAFT 12 MM BODY SIZE TOP MOUNT RE0123 21 850 0098 00 1 LCD ASSEMBLY 1741C 22 211 1117 00 6 SCREW MACHINE 4 40X0 500 PAN HEAD T 10 TORX CD PL 23 337 4419 00 1 PORON FOAM SHIELD 24 850 0059 00 1 LCD DISPLAY MODULE TESTED INCLUDED PARTS 119 7439 00 1 DISPLAY MODULE LCD COLOR 1024X768 XGA 6 3 DIAG Attached Parts 337 4421 00 1 SHIELD DISPLAY 5 568 X 4 221 0 090 THICK 0 043 THICK GLASS 0 021 THICK BLACK PORON End Attached Parts 131 6521 00 4 CONTACT ELEC EMI CLIP ON 0 38 L X 0 460 W 2 CONTACTS X 0 45 HIGH ELECTROLESS NICKEL PLATE 211 0950 00 4 SCREW MACHINE M2X 4X3L PHL PNH STEEL ZINC FINISH 174 5428 00 1 ASSY SHIELDED RIBBON ADAPTER TO XGA LVDS LCD DISPLAY 20 PIN 4IN 174 5485 00 1 CABLE ASSEMBLY DISPLAY
7. 2 on page 4 20 1741C Waveform Monitor Service Manual 4 19 Removal and Replacement Procedures 0081 001 Figure 4 2 Front panel cable connections Remove the bezel from the LCD assembly 4 Remove the two T10 screws securing the bezel to the Front Panel board See Figure 4 3 on page 4 21 When reinstalling torque these screws to 8 in lb 5 Remove the two 1 Pozidriv screws securing the bottom of the bezel to the display bracket When reinstalling torque these screws to 4 in lb 6 Use a spudger or other tool to pry the bezel clips away from the bracket and then pull the bezel away leading the front panel cable through the cutout in the bracket 4 20 1741 Waveform Monitor Service Manual Removal and Replacement Procedures Bezel securing clips Front panel screws n 0999555658555 2 058 a 5959992 599 999 SS 955 0081 002 Bezel securing screws Figure 4 3 Front panel disassembly LCD backlight You must partially disassemble the LCD assembly to change the backlights There are two backlights One is located at the top of the LCD assembly and one is located at the bottom of the LCD assembly Each can be accessed from its respective corner of the assembly Perform the following procedures to remove the backlights 1 Remove the six screws attaching the LCD assembly to the display bracket You will have to push the poron gasket aside with the screwdriver to access the screws W
8. 3 If steps 1 and 2 do not remove all the dust or dirt the waveform monitor may be spray washed using a solution of 75 isopropyl alcohol by doing steps 4 through 6 4 Gain access to the parts to be cleaned by removing easily accessible shields and panels 5 Spray wash dirty parts with the isopropyl alcohol and wait 60 seconds for the majority of the alcohol to evaporate 6 Dry all parts with low pressure deionized air Lubrication There is no periodic lubrication required for the waveform monitor 1741C Waveform Monitor Service Manual Troubleshooting A Getting Started General Maintenance The procedures in this section will help you trace the root cause of a problem back to one of the replaceable modules In general this is a board level replacement but there are a few components on some boards that are replaceable WARNING Before performing this or any other procedure in this manual read the General Safety Summary and Service Safety Summary found at the beginning of this manual To prevent possible injury to service personnel or damage to electrical component refer on how to prevent ESD See page 4 1 This procedure consists of two main sections the first section contains the Symptoms and Causes table and the second section contains a set of Detailed Troubleshooting Procedures The table lists common problems and should help you identify the problem or it may direct you to one of the detailed troubl
9. I OL ANN m mE Sun FOR E e pa 15 TN POSTA ez I B dhe Bo ad J14 D5231 DS232 F221 F222 F223 F231 F232 F233 F234 0 321 e DS861 R864 elc Figure 4 1 Main board power supply test points and LEDs 1741C Waveform Monitor Service Manual Removal and Replacement Procedures Removal and Replacement Procedures Preparation A This section contains information about removal and replacement of all modules in the waveform monitor WARNING Before doing this or any other procedure in this manual read the safety summaries found at the beginning of this manual Also to prevent possible injury to service personnel or damage to the instrument components read Installation in Section 2 and Preventing ESD in this section This subsection contains the following items m This preparatory information that you need to properly do the procedures that follow m List of tools required to remove and disassemble all modules Procedures for removal and reinstallation of the modules WARNING Before doing any procedure in this subsection disconnect the
10. INVERTER 15 PIN LED BACKLIGHT TO DISPLAY 337 4419 00 1 PORON FOAM SHIELD 407 5303 00 2 BRACKET CRADLE WFM END INCLUDED PARTS 25 174 5428 00 1 CA ASSY SHIELDED RIBBON ADAPTER TO XGA LCD DISPLAY 20 PIN 26 174 5493 00 1 CABLE ASSY SP DISCRETE MAIN BD TO BACKLIGHT DRIVER 27 119 6554 00 1 FAN ASSEMBLY 12V 0 11A 1 3W 28CFM 2450RPM 27DBA 80MM SQ X 20MM 6 IN 3 LEAD WITH CONN UL CSA VDE SAFETY CONTROLLED 1741C Waveform Monitor Service Manual 5 5 Replaceable Parts Table 5 2 Chassis components See Figure 5 2 cont Fig amp Tektronix part Serial no Serial no Qty Name amp description index number effective discont d number 28 211 1050 00 SCREW MACHINE 6 32 X 0 312 L PNH STL CAD PLT T15 29 131 6521 00 3 CONTACT ELEC EMI CLIP ON 0 38 L X 0 500 W 2 CONTACTS X 0 45 H ELECTROLESS NICKEL PLATE 30 407 4999 00 1 BRACKET FAN MOUNTING 0 050 AL SAFETY CONTROLLED 5 6 1741C Waveform Monitor Service Manual Replaceable Parts 00000000000000 Figure 5 2 Chassis components 5 7 1741 Waveform Monitor Service Manual Replaceable Parts Table 5 3 Replaceable parts list See Figure 5 3 Fig amp index Tektronix part Serial no Serial no number number effective discont d Oty Name amp description 5 3 Main Board 1 159 5022 00 7 FUSE 5 0A 125V FAST BLOW 0 1 X 0 1 X 0 24 UL REG CSA CERT 451005 SAFETY CONTROLLED 2 260 5015 00 1 SWITCH PUS
11. Perform this test if there is no display on the LCD but the power supplies test as nominal 1 Connect an external XGA monitor to the Display output on the rear of the instrument Cycle the power and watch the external monitor If the monitor does not display the boot up messages and normal operational screen replace the Main board If the external monitor does show the nominal screen check the gray ribbon cable from the internal display to J17 on the Main board This carries the XGA data to the display If the gray ribbon cable is OK look at an angle into the gap at the left edge of the LCD turn the power off and on and you should be able to see the backlight come on It may help to be in a low light area to see the backlight 1741C Waveform Monitor Service Manual Examine Power Up Diagnostics Results in the Diagnostic Log Run Advanced Diagnostics General Maintenance 5 Ifthe backlight is on replace the front panel assembly 6 Ifthe backlight is not on check the backlight power cable from the backlight inverter on the rear of the display assembly to the Main board J18 Also check connector J18 itself for any solder issues 7 Ifthe backlight is still bad replace the front panel assembly although there is still a small chance the problem is in the Main board To examine the Power up Diagnostics results push the CONFIG button then select Utilities gt View Diagnostic Log Each power up is indicated b
12. oscilloscope to look for a 3 3 V square wave on the tachometer feedback line Replace the fan if the pull up is intact but there is no signal on the tachometer line This section describes methods for verifying the proper operation of the waveform monitor primary power supply WARNING Some parts of this test may require removing the insulating safety shield To avoid personal injury be careful not to contact the circuitry while the shield is removed Be sure to replace the shield as soon as possible to prevent injury The main power supply accepts 100 to 240 Vac and outputs 5 Vpc The output voltage at the supply must be between 4 9 and 5 3 V for correct operation On the Main board the common 5 V supply must be between 4 80 and 5 25 1741C Waveform Monitor Service Manual General Maintenance There is also a green LED DS232 that will be lit if some 5 V power is present This is a useful indicator but does not insure that the voltage is within tolerance If the power supply output is correct check the seven fuses in the 5 V system near the Main board power connector J14 See Figure 4 1 on page 4 15 All should have 5 V on both sides If not replace the fuse See the Replaceable Parts List for fuse values See Table 5 3 AN CAUTION Replace a fuse only with a fuse of the same type and rating Failure to do so can result in improper operation and could cause a fire If the supply output voltage is zero then
13. select the Composite A signal 3 Push the CONFIG button 4 Use the arrow keys or the General knob to navigate to Outputs and set the Composite Pixmon to On 5 Push the left arrow key to return to the first level of the CONFIG menu 6 Connect an XGA to 5x BNC adapter cable to the PixMon output on the waveform monitor 7 Connect the Green video signal to the oscilloscope input Use an oscilloscope with a 75 Q input or use a 75 Q feed through termination 8 Set the Oscilloscope Control Setting Vert 200 mV Div Horiz 20 us Div Trigger Edge 9 Push the Config button 10 Select Utilities gt Calibration and then push SEL to enter the calibration menu 11 Navigate to the Pixmon Composite Gain case and then push SEL 12 Adjust the General Purpose knob to set the video portion of the signal to 714 mV 100 IRE 13 Follow the instructions at the bottom of the screen to Save and Exit Calibration mode Perform the following steps if the Offset is outside the specification 1 2 3 Push Input A to select the Composite A signal Push the Config button Select Utilities gt Calibration and then push SEL to enter the calibration menu Navigate to Composite DC Offset and push SEL to automatically adjust the offset 1741C Waveform Monitor Service Manual Adjustments Follow the instructions at the bottom of the screen to Save and Exit Calibration mode Push Input C to select the Composite C signal and
14. supply Disconnect the power cable from J2 on the power supply 1741C Waveform Monitor Service Manual Fan Assembly Front Panel LCD Assembly 8 9 Removal and Replacement Procedures Remove the two T15 screws securing the power supply to the shield When reinstalling torque these screws to 8 in Ib Lift the power supply out of the shield Remove the fan and baffle as a unit 1 From outside the instrument remove the one T10 screw on each side of the instrument that secures the baffle to the chassis When reinstalling torque these screws to 8 in lb Use long nose pliers to compress the lock tab on the connector and disconnect the fan power cable from J890 on the Main board See Figure 4 2 on page 4 20 Lift the baffle out of the instrument When replacing the fan and baffle make sure that the guide pins and slots line up correctly top and bottom Remove the front panel and LCD assembly as a unit For additional clearance you may remove the Fan assembly first 1 Remove the six T10 screws that secure the front panel assembly to the chassis two on each side and two on the bottom When reinstalling torque these screws to 8 in lb Pull the front panel assembly forward being careful of the Main board extension containing the headphone and USB connectors until they clear the LCD bracket Disconnect the cables connecting the Front panel LCD assembly to the Main board at J17 J18 and J29 See Figure 4
15. the Main board Unknown Problems An instrument may come into service with vague or intermittent symptoms In a case like this the following set of tests may help find the problem or the marginal condition 1 Check the diagnostic log This log records a variety of problems and will enable you to see messages for an error that may not be currently happening 2 Check the power supplies by performing the Primary and Secondary Supply checks A marginal supply can lead to intermittent operation if it is near the acceptable threshold This includes the main supply and the secondary supplies on each board 3 Check the error log This may give clues about how the unit was operating when the user saw problems 4 Perform the incoming inspection tests This will exercise a majority of the functions in the unit and includes the advanced diagnostics Some parts of the test may not be necessary for all problem areas Detailed Troubleshooting Procedures The following tests should be run as indicated in the Symptom and Causes table See Table 4 4 on page 4 6 The procedures check for specific problems or will help you isolate a problem to a board You can run them at any time for informational purposes but if you do not run the procedures in the correct context then the final recommendation identifying a root cause might be suspect List of detailed troubleshooting procedures m General Checks m Primary Power Supply Checks m Secondar
16. the block diagram covers functions on the Main board The upper sections cover those of the video input boards The primary functions on the Main board are Reference Input Digital Waveform Processing Engine Rasterizing Engine Recursion and Picture processing Engine Control Processor and it s associated peripherals LTC decoder DU pv oS Secondary Power supplies There are also miscellaneous circuits such as the thermal control system for the fan Power Distribution is not shown in the block diagram but is covered at the end of this section 1741C Waveform Monitor Service Manual 2 1 Theory of Operation Composite I O 1 CPSA VAI Composite I O 2 CPSC CPSD V WV 2 u a a ia assa I I I I I I I I I I I I I I I I I I I I I I I I I I I I Sync Measurement and Exdemalrer n stripper raster processing black or tri level DSP FPGAs Front panel buttons and knobs Power supply Picture processing ANALOG recursion and PIX OUT display combining DSY FPGA DISPLAY OUT Uf LCD Display Backlight power supply CPU core Interposer and PLD and peripherals memory Main board Figure 2 1 Main block diagram 2 2 0155 011 1741C Waveform Monitor Service Manual Main Board Reference Input Digital Waveform Processing Engine Rasterizing
17. then repeat steps 2 through 5 Composite Analog Vertical Perform the following steps if the Amplitude is outside the specification Measurement Accuracy ang gt YS N 1 Connect a 100 color bar signal from the precision generator to the Composite A input Terminate the loop through with a precision 75 Q termination Push Input A to select the Composite A signal Push the CONFIG button Navigate to Utilities gt Calibration and then push SEL Select Composite Waveform Gain and then push SEL Follow the on screen instructions to adjust the gain Follow the instructions at the bottom of the screen to Save and Exit Calibration mode Move the 100 color bar signal to the Composite C input Terminate the loop through with a precision 75 termination Push Input C to select the Composite C signal and then repeat steps 3 through 7 Composite Analog If the Frequency Response is outside the specification follow this adjustment Frequency Response procedure 1 SP Q gt Connect the precision generator to the Composite A input Terminate the loop through with a precision 75 termination Set the precision generator for a 700 mV Multiburst signal The top packet must be 5 75 MHz Push the CONFIG button Navigate to Utilities gt Calibration and then push SEL Select Composite Freq Peak and then push SEL Follow the on screen instructions to adjust the response Follow the instructions at the bottom of the sc
18. used to check the bits provided to the LCD If any bits are missing then you will see banding in the ramps It is normal to see some bands about inch 2 mm wide especially near the lower intensity regions of the ramp This is because the LCD is only 6 bits so there are 64 steps in the ramp However any larger steps or any non monotonic regions indicate a problem Check the cable to the LCD perform the LCD diagnostic procedure or replace the display assembly It is also possible for the Main board to cause problems in this area 1741C Waveform Monitor Service Manual 4 13 General Maintenance Table 4 6 Advanced diagnostic measurements Measurement Min Max VGA Clock 64 4375 MHz 64 4575 MHz QDR Clock 25 1650 MHz 25 1850 MHz HSYNC PW 20 4 us 20 8 us VSYNC PW 18974 9 us 19174 9 us 4 14 1741C Waveform Monitor Service Manual DS761 Secondary Power Supply Test Points General Maintenance Ast tl LR lt i EN ql AN Gi ef nds Mg j D A ap o N EFE excep mean dL B yd Ean 8
19. Engine Recursion and Picture Processing Engine Control Processor LTC Theory of Operation The Reference input is a passive loopthrough which is AC coupled and buffered The reference signal is routed to the composite input boards where 10 bit ADCs digitize the signal The digitized signal is then routed back to the DSP FPGA on the Main board so the timing information can be derived The parallel data streams from the Composite video inputs are applied to the waveform processing FPGA This block processes the data to generate the signals needed to create the displays The Rasterizer engine resides in the same DSP FPGA as the waveform processing engine This block builds up the variable intensity images in the fast static RAM For each pixel of the display the Rasterizer Engine increments the intensity of that pixel every time the waveform hits its coordinates As a result the waveform areas hit more frequently are brighter For any given frame the intensity map is built up in one memory chip and read out of the other The functions swap on the next field The output of the rasterizer feeds the picture and recursive processing engine in the second large FPGA This engine adds the previous frame to the present frame to reduce flicker and improve brightness It also converts the picture and waveform signals from the input rate of 50 or 59 94 Hz to 60 Hz frame rate to work with the XGA monitor The picture and waveform data combine with t
20. General Maintenance Table 4 4 Symptoms and causes cont Symptom Possible Sources or Recommended Detailed Troubleshooting Procedure to follow Fails any of these Power On Review messages in diagnostic log Diagnostics Perform primary power supply checks m Composite DAC Comm Perform secondary power supply checks Run Advanced Diagnostics and look for other information m Composite SPI Comm pos Replace the Composite board m Front Panel Version Information Failures while running the Perform secondary power supply checks advanced diagnostics Replace Main board m Display Data Bus m Display Address Bus m Raster Data Bus Input m DSP1 Data Bus m DSP1 Address Bus m DSP2 Data Bus m DSP2 Address Bus m DSP1 QDR m DSP1 QDR2 m DSP2 QDR1 m DSP2 QDR2 m RD SDRAM Data m RD SDRAM Address m DSP1 SDRAM Data Bus m DSP1 SDRAM Address Bus m DSP2 SDRAM Data Bus m DSP2 SDRAM Address Bus 1741C Waveform Monitor Service Manual 4 7 General Maintenance Table 4 4 Symptoms and causes cont Symptom Possible Sources or Recommended Detailed Troubleshooting Procedure to follow Failures while running the advanced diagnostics cont DSY DSP1 Bus Output DSY DSP1 Bus Input DSP1 DSY Bus Output DSP1 gt DSY Bus Input DSY DSP2 Bus Output DSY DSP2 Bus Input DSP2 gt DSY Bus Output DSP2 gt DSY Bus Input DSP1 DSP2 Bus Output DSP1 DSP2 Bus Input DSP2 DSP1 Bus Output DSP2 g
21. H SPST TACT 50MA 50V MOMENTARY SILVER CONTACTS KSC221G GULLWING SMD 3 159 5018 00 1 FUSE 3 0A 125V FAST BLOW 0 1 X 0 1 X 0 24 UL REG CSA CERT SAFETY CONTROLLED 4 146 0109 00 1 BATTERY DRY 3 0V LITHIUM MANGANESE DIOXIDE 210MAH 20 X 3 22MM COIN CELL WITH SOLDER TABS CR2032 1HF1 5 119 5660 00 1 TRANSDUCER PIEZOELECTRIC AUDIO IN 3 TO 25V P P OUT 70DB AT 10CM AT 3V FREQ 3 5 5 5KHZ PKG DIA 13 MM X 7 8 H 5 0MM PIN SPACING NOT MACHINE WASHABLE PKM13EPY 4000 TF01 6 159 5003 00 1 FUSE THRM CHIP SELF RESETTING FUSE 1 1A HOLD 2 2A TRIP AT 20 DEG C 30V MAX SAFETY CONTROLLED 7 159 5014 00 1 FUSE 2 0A 125V FAST BLOW 0 1 X 0 1 X 0 24 UL REG CSA CERT SAFETY CONTROLLED 5 8 1741C Waveform Monitor Service Manual LESE a als oum sem WE H 0 Basile Bobet B 3 Lj E Ede u lb Ti Cz as oT en a ew AU us me UE qa GOSS Egg
22. NUT PLAIN HEX 0 5 28 X 0 562 HEX BRS CD PL 27 210 1039 00 8 WASHER LOCK 0 521 ID INT 0 025 THK SST 28 333 4578 00 1 REAR PANEL SAFETY CONTROLLED 1741C 29 131 3378 00 8 CONN RF JACK BNC 50 OHM FEMALE RTANG PCB REAR PNL 0 5 28 THD 0 625 0 187 TAIL W O MTG FLANGE W MTG POSTS METAL BODY 1741C Waveform Monitor Service Manual 5 3 Replaceable Parts 59 with yellow stripe Ground lug Figure 5 1 Circuit boards and connectors 1741C Waveform Monitor Service Manual 54 Table 5 2 Chassis components See Figure 5 2 Replaceable Parts Fig amp Tektronix part Qty Name amp description index number number 5 2 Chassis Components 1 200 4911 00 1 COVER TOP CHASSIS SAFETY CONTROLLED 2 386 7435 00 2 SUPPORT CIRCUIT BOARD 3 211 0734 00 18 SCREW MACHINE 6 32 X 0 250 FLH100 STL CDPL T 10 TORX DR 4 211 1117 00 2 SCREW MACHINE 4 40 X 0 187 PAN HEAD STL CD PL T 10 TORX DR 5 870 0186 00 1 LED BACKLIGHT DRIVER 6 211 1117 00 2 SCREW MACHINE 4 40 X 0 187 PAN HEAD STL CD PL T 10 TORX DR 7 407 5314 00 1 BRACKET DISPLAY MOUNTING FRONT SAFETY CONTROLLED 8 150 0335 00 2 LAMP BACKLIGHT ASSY LED REPLACEMENT FOR 119743900 6 5 LCD DISPLAY 9 850 0097 00 1 FRONT PANEL ASSY MODULE 1741C TESTED 10 129 1636 00 2 SPACER POST 4 40M F 0 687L SST 0 188HEX 11 174 5492 00
23. Parts Fig amp index Tektronix part Serial no Serial no number number effective discont d Oty Name amp description 14 119 7086 00 1 FILTER EMI AC LINE CONNECTOR INPUT FILTER 6 0A 120 250VAC DC 400 HZ 2 2 NF CY 100 NF CX IEC INPUT FAST ON SOLDER LUG OUTPUT CHASSIS MOUNT SAFETY CONTROLLED FN9222 6 06 15 211 0722 00 2 SCREW MACHINE 6 32 X 0 250 PNH STL CDPL T 15 TORX DR 16 174 5030 00 1 CABLE ASSEMBLY POWER PWR SUPPLY TO MAIN BD 17 220 0497 00 2 NUT PLAIN HEX 0 5 28 X 0 562 HEX BRS CD PL 18 210 1039 00 2 WASHER LOCK 0 521 ID INT 0 025 THK SST 19 214 3903 00 6 SCREW JACK 4 40 X 0 312 LONG 0 188 HEX HEAD STAND OFF 4 40 INT THD X 0 312 THD EXT 4 40 20 131 7582 00 1 CONN DSUB PCB FEMALE RTANG DUAL STACKED 15 POS HD LOWER 9 POS UPPER SAFETY CONTROLLED 21 131 7257 00 1 CONN JACK PCB PNL RJ45 CAT5 W LEDS YELLOW amp GREEN FEMALE RTANG 8 POS 0 1 CTR 0 528 H X 0 138 TAIL 10 100 BASE TX AND RX MAGNETICS MODULE SAFETY CONTROLLED 22 131 5450 00 1 CONN DSUB PCB HIGH DENSITY FEMALE RTANG 15 POS 0 078 CTR 0 350 MLG X 0 125 TAIL 4 40 THD INSERT BD RETENTION 30 GOLD SAFETY CONTROLLED 23 131 3378 00 2 CONN RF JACK BNC 50 OHM FEMALE RTANG PCB REAR PNL 0 5 28 THD 0 625 H X 0 187 TAIL W O MTG FLANGE W MTG POSTS METAL BODY 24 211 0722 00 10 SCREW MACHINE 6 32 X 0 250 PNH STL CDPL T 15 TORX DR 25 211 0722 00 6 SCREW MACHINE 6 32 X 0 250 PNH STL CDPL T 15 TORX DR 26 220 0497 00 8
24. These are passive loopthrough inputs If unterminated the signal appears twice as large as it should The inputs on each board are either AC or DC coupled depending on the DC Restore setting Input selection is done by a combination of settings stored in a selection register and a signal from the Measurement and Raster Processing block on the Main board The selected input signal is filtered and applied to an A to D converter to generate a 14 bit parallel signal which is routed to the DSP FPGA on the Main board where it is demodulated in the digital domain The inputs are also routed to a synchronizing source switch where the source is determined by a selection register The selected synchronizing source is routed to a sync stripper whose output is sent to the Main board There are multiple temperature sensors in different locations in the instrument The control processor reads the temperature sensors and sets a target speed for the fan The fan circuit holds the fan speed at the target by measuring the fan tachometer output allowing reliable operation at low speed If the fan is not turning the circuit senses the stall and turns on a red LED DS861 on the Main board The fan is tested at power up If it fails a message is shown on screen and also entered into the diagnostic log Power Supply and Distribution 2 4 The power supply has a universal AC input enabling it to accommodate 100 to 240 Vac without any user range switching The
25. Use only the power cord specified for this product and certified for the country of use 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 Observe all terminal ratings To avoid fire or shock hazard observe all ratings and markings on the product Consult the product manual for further ratings information before making connections to the product Do not apply a potential to any terminal including the common terminal that exceeds the maximum rating of that terminal Power disconnect The power cord disconnects the product from the power source Do not block the power cord it must remain accessible to the user at all times Do not operate without covers Do not operate this product with covers or panels removed Do not operate with suspected failures If you suspect that there is damage to this product have it inspected by qualified service personnel Avoid exposed circuitry Do not touch exposed connections and components when power is present Replace batteries properly Replace batteries only with the specified type and rating Use proper fuse Use only the fuse type and rating specified for this product Wear eye protection Wear eye protection if exposure to high intensity rays or
26. a list of offices www tektronix com 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 1741C Waveform Monitor Service Manual 5 1 Replaceable Parts Using the Replaceable Parts Lists This section contains lists of the mechanical and or electrical components that are replaceable for the 1741C Waveform Monitor Use this list to identify and order replacement parts The following table describes each column in the parts list Parts list column descriptions Parts list column descriptions Column Column name Description 1 Figure amp index Items in this section are referenced by figure and index numbers to the illustrations that follow number Orderable modules show the figure number without an index number 2 Tektronix part Use this part number when ordering replacement parts from Tektronix number 4 Qty This indicates the quantity of parts used Name amp description An item name is separated from the description by a colon Because of space limitations an item name may sometimes appear as incomplete Use the U S Federal Catalog handbook H6 1 for further item name identification Abbreviations Abbreviations conform to American National Standard ANSI Y1 1 1972 Table 5 1 Replaceable parts list See Figure 5 1 Fig amp
27. ce static sensitive modules only at a static free work station Nothing capable of generating or holding a static charge should be allowed on the work station surface Handle circuit boards by the edges when possible 1741C Waveform Monitor Service Manual 4 1 General Maintenance 6 Do not slide the circuit boards over any surface 7 Avoid handling circuit boards in areas that have a floor or work surface covering capable of generating a static charge Inspection and Cleaning 42 General Care A Interior Cleaning Exterior Cleaning A Inspection and Cleaning describes how to inspect for dirt and damage It also describes how to clean the exterior and interior of the waveform monitor Inspection and cleaning are done as preventive maintenance Preventive maintenance when done regularly may prevent waveform monitor malfunction and enhance its reliability Preventive maintenance consists of visually inspecting and cleaning the waveform monitor and using general care when operating it How often maintenance should be performed depends on the severity of the environment in which the waveform monitor is used A proper time to perform preventive maintenance is just before any waveform monitor adjustment The cabinet helps keep dust out of the waveform monitor and should normally be in place when operating the waveform monitor WARNING To prevent injury or death power down the instrument and disconnect it from lin
28. check the input circuit The voltage should be the same at the line cord at the input to the power supply and on both ends of the fuse on the input to the supply If the input voltage is correct while the output is not replace the supply If the input voltage is not correct replace the element in the chain that is not passing the AC input If the voltage at the output of the supply is not zero but still not correct check the input voltage If the input voltage is in the correct range then disconnect the output of the supply from the Main board and recheck the output voltage If the voltage is still not correct then replace the power supply If the no load output voltage is correct then reattach the cable to the Main board and measure the current by clamping the ammeter around all the red wires If the current is less than 14 Amps and the voltage is still bad then replace the power supply If the current is more than 14 Amps then remove module boards and recheck the current If it is still high then replace the Main board If not then test with one option board at a time to find the one with excess current and replace that board Secondary Power Supply There are multiple secondary supplies that are derived from the main 5 V supply Tests sure all seven 5 V fuses are good as noted in Primary Power Supply Tests before checking the secondary supplies First check the LEDs near the power connector J14 Green LED DS232 indicates there
29. dering Information issssamaa o ii 5 1 Using the Replaceable Parts LIsts eee Ime mese mener enn 5 2 ii 1741C Waveform Monitor Service Manual List of Figures Figure 2 1 Main block dI8gram a ee e emen sese EEE 2 2 Figure 4 1 Main board power supply test points and LEDS 4 15 Figure 4 2 Front panel cable ene e me emen enn 4 20 Figure 4 3 Front panel disassembly n aa a aa naan ee 4 21 Figure 4 4 LCD assembly bracket and backlight lock 4 22 Figure 4 5 Backlight removal cessisse estet 4 23 Figure 5 1 Circuit boards and 5 nananana naa eee 5 4 Figure 5 2 Chassis nanna e eee se e eme he sess se n ne nnn 5 7 Figure 5 3 Main board replaceable components 5 9 1741 Waveform Monitor Service Manual iii Table of Contents List of Tables iv Table i Related documentation csse ee e eme e se se he he eene X Table 3 1 Required equipment for adjustment esses eme enn 3 1 Table 4 1 External inspection check list 4 3 Table 4 2 Internal inspection check list 0 cece cece cece een eee ee mme ee 4 3 Table 4 3 Required t
30. dule circuit boards in place 1 Remove the two T10 screws securing each board support and then lift them from the chassis When reinstalling torque these screws to 8 in lb When reinstalling the board supports make sure that the module circuit boards line up with the slots in the board supports The rear panel is formed by the chassis and the Composite module rear panel which overlap and are bolted together Follow this procedure to remove the Composite boards 1 Remove the six T15 screws securing the Composite module to the rear panel When reinstalling torque these screws to 8 in lb Lift the Composite module out of the instrument rocking it gently until the connectors separate from J9 and J13 on the Main board For the Composite board you are removing use the 9 16 inch socket to remove the nuts attaching the BNC s to the rear panel When reassembling torque these nuts to 10 in Ib Disconnect the brown blue and green yellow primary wires from the line filter See Figure 5 1 on page 5 4 Disconnect the green yellow ground wire from the chassis using a 5 16 inch nutdriver See Figure 5 1 on page 5 4 Disconnect the power cable from J14 on the Main board From outside the instrument remove the four T10 screws securing the power supply assembly to the chassis When reinstalling torque these screws to 8 in lb Lift the power supply out of the chassis Disconnect the line filter cable from J1 on the power
31. e 1741C Waveform Monitor Use this list to identify and order replacement parts Note that not all parts listed in this section are present on every model The parts present will depend on the model and options installed Parts Ordering Information Module Servicing 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 m Part number 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 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 remanufactured module These modules cost significantly less than new modules and meet the same factory specifications For more information about the module exchange program call 1 800 833 9200 Outside North America contact a Tektronix sales office or distributor see the Tektronix Web site for
32. e voltage before performing any procedure that follows Use a dry low velocity stream of air to clean the interior of the chassis Use a soft bristle non static producing brush for cleaning around components If you must use a liquid for minor interior cleaning use a 75 isopropyl alcohol solution and rinse with deionized water Clean the exterior surfaces of the chassis with a dry lint free cloth or a soft bristle brush If any dirt remains use a cloth or swab dipped in a 75 isopropyl alcohol solution Use a swab to clean narrow spaces around controls and connectors Do not use abrasive compounds on any part of the instrument that may damaged by it CAUTION Avoid the use of chemical cleaning agents that might damage the plastics used in the waveform monitor Use only deionized water when cleaning the front panel buttons Use a glass cleaner to clean the LCD For the rest of the instrument 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 1741C Waveform Monitor Service Manual General Maintenance Inspection Exterior Inspect the outside of the waveform monitor for damage wear and missing parts using the following table as a guide Immediately repair defects that could cause personal injury or lead to further damage to the waveform monitor Table 4 1 External inspection check list Item In
33. eshooting procedures in the second section If you do not find your instrument s problem in the table or if no specific problem was reported by the user then follow the steps in the Unknown Problem section in the Symptoms and Causes table The 1741C waveform monitor is a complex instrument and behavior is sometimes complex Before troubleshooting in depth verify that the current settings support the expected behavior A good first step is to recall the Factory Presets To properly test a waveform monitor you must have appropriate signal sources For the 1741C you will need a Composite video source In some cases you may also need receivers or an oscilloscope to check outputs These instruments consist of several boards and major components The objective of this troubleshooting guide is to isolate a problem to a module or board so it can be replaced This guide does not provide information to troubleshoot to the component level Standard boards and modules Power supply Display Assembly LCD Backlight inverter Front Panel board with buttons LEDs and knobs m Main board Composite input boards 1 and 2 1741C Waveform Monitor Service Manual 4 5 General Maintenance Table 4 3 Required test equipment Test equipment Requirements Example Video test generator with composite signal source XGA Monitor Composite signals required NTSC SMPTE bars Tektronix TG2000 with AVG1 module Precision calibrat
34. est equipment aa n aa naa naan eben EEE ns 4 6 Table 4 4 Symptoms and causes ne aa a messen nnns 4 6 Table 4 5 Main board secondary supplies 4 12 Table 4 6 Advanced diagnostic measurements ccc cece ence cece eee eee eee 4 14 Table 4 7 Tools required for module removal ccc ccc cece eee enna ees 4 16 T ble 4 8 Module removal gu as ed 4 17 Table 5 1 Replaceable parts list See Figure 5 1 cece eee nana eee en 5 2 Table 5 2 Chassis components See Figure 5 2 cece cence eee naa annan nennen eas 5 5 Table 5 3 Replaceable parts list See Figure 5 3 naa nan eene 5 8 Table 5 4 Replaceable parts 1 eee meme emen mese 5 10 1741C Waveform Monitor Service Manual General Safety Summary General Safety Summary To Avoid Fire or Personal Injury 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 personnel should perform service procedures While using this product you may need to access other parts of a larger system Read the safety sections of the other component manuals for warnings and cautions related to operating the system Use proper power cord
35. evel and how to handle the modules Replaceable Parts illustrates the replaceable modules and mechanical parts and provides replacement part numbers The following terms and conventions are used throughout this manual 1741C Waveform Monitor Service Manual The term monitor is used interchangeably with the more formal term 1741C Waveform Monitor The term instrument is used interchangeably with the term monitor Preface Related Manuals This manual assumes you have access to the following manuals when servicing this product These manuals ship with the product and are also downloadable from the Tektronix Web site Table i Related documentation Item Purpose Location 1741C Waveform Monitor Quick Start Installation and high level operational lt User Manual overview lt gt 1741C Waveform Monitor Specifications Procedure for checking performance and and Performance Verification list of specifications Sy 1741C Master Information Base Programmers command reference for n controlling the waveform monitor gt x 1741C Waveform Monitor Service Manual Introduction Introduction Service Strategy Specifications The 1741C Waveform Monitor provides a powerful monitoring solution for broadcast production and post production environments The 1741C Waveform Monitors will be repaired to the module level at selected Tektronix service centers Repair includes functional verification of
36. he graphics information from the control processor and then output to the XGA DAC to drive the external monitor Note that the parallel data from the serial digital inputs connect directly to this FPGA to provide the picture functionality bypassing the waveform processing engine The control processor is in charge of all the operational modes in the instrument It communicates with the front panel through SPI signaling and controls most other internal devices though either the SPI or the 12 bus A few parts communicate through other bus types like or SPI The control processor interfaces to the Ethernet through a dual rate connection This allows the network connection to run at 10 or 100 MBps LTC inputs come from the remote connector The LTC signal is applied to an A D converter and then input to the waveform processing FPGA which decodes the time code information NOTE The FPGAs decode VITC signals digitally 1741C Waveform Monitor Service Manual 2 3 Theory of Operation Front Panel Composite Input Fan Control The front panel contains a small processor which communicates with the control processor through SPI signaling Reprogramming can be done through SPI as well if the front panel processor flash code needs to be updated The waveform monitor contains two composite input boards each of which contain two composite inputs One board contains inputs A and B and the other board contains inputs C and D
37. hen reinstalling torque these screws to 5 5 in lb 2 Separate the LCD assembly and the display bracket and lay the LCD assembly face down on a soft static free surface 3 Remove the two screws attached to the right hand bracket of the LCD display assembly The right hand bracket is on the right when the assembly is facing you as shown See Figure 4 4 When reinstalling torque these screws to 1 0 in lb 1741C Waveform Monitor Service Manual 421 Removal and Replacement Procedures Screws I 2442 016 a Rubber Depressing the tensioning spacer backlight lock Figure 4 4 LCD assembly bracket and backlight lock 4 Gently separate the poron gasket from the bracket and remove the bracket 5 While depressing the small white plastic backlight lock located on the corner of the assembly remove the rubber tensioning spacer using a thin object CAUTION To prevent damage do not bend the flex circuitry Carefully remove the flex circuit from the metal guides and connector latch 4 22 1741 Waveform Monitor Service Manual Removal and Replacement Procedures 6 Lift up on the flex circuit connector latch and remove the flex circuit from the connector See Figure 4 5 Latch Flex circuit AL 7 Carefully remove the flex circuit from the metal guides Backlight pone dT 5 N G 2442 017 Figure 4 5 Backlight removal 8 Pull the backlight straight
38. ion signals Computer monitor capable of 1024 x 768 x 60 Hz scan rate Tektronix part number 067 0465 00 calibration fixture for TG2000 Voltmeter DC Ammeter with Clamp on pickup 20 Amp DC capable Fluke 87 or equivalent Fluke 336 or equivalent Oscilloscope Video trigger capability Tektronix TDS3000C Series Table 4 4 Symptoms and causes Symptom Possible Sources or Recommended Detailed Troubleshooting Procedure to follow No LEDs lit and or LCD not Perform general checks working Perform primary power supply checks Perform secondary power supply checks Perform Front Panel button Troubleshooting Perform LCD troubleshooting test Replace Main circuit board or Front Panel assembly as indicated by above tests Inconsistent or partial hardware Perform primary power supply checks failures Perform secondary power supply checks Examine Power up Diagnostics results in the Diagnostic Log Run Advanced Diagnostics Replace Main circuit board Fails any of these Power On Review messages in diagnostic log Diagnostics Perform primary power supply checks m Main Board Power Supplies Perform secondary power supply checks m Main Board Sensor Replace the Main board m Main Board Serial EEPROM m Main Board Serial FLASH DSP FPGA A B COMM m DSP FPGA A B Program m Display FPGA COMM Display FPGA Program Run Advanced Diagnostics and look for other information 4 6 1741 Waveform Monitor Service Manual
39. is some 5 V from the main supply Next check if any of the three Red LEDs DS231 DS321 or DS761 are on These indicate failures on the General 5 V processor core 1 3 V and general 3 3 V supplies respectively If these are lit the most likely causes are the fuses near J14 but if those are all OK replace the Main board Next check the secondary supplies as shown in Table 4 5 Each supply has a test point in the front left corner of the Main board See Figure 4 1 on page 4 15 If any supplies are out of range replace the Main board 1741C Waveform Monitor Service Manual 4 11 General Maintenance Front Panel Button Troubleshooting LCD Troubleshooting Table 4 5 Main board secondary supplies Nominal V Allowed range V Measure at 1 8 1 7 to 1 9 TP29 Fan 5 to 13 5 TP24 5 4 75 to 5 25 TP27 3 3 3 2 to 3 4 TP31 2 5 2 4 to 2 6 TP33 1 5 1 4 to 1 6 TP35 5 4 75 to 5 25 TP36 5A 4 75 to 5 25 TP39 1 3 Core 1 2 to 1 4 TP30 Perform this test if the power supplies are good but none of the buttons are lit or respond to pushes 1 Cycle the power to the unit Immediately after power up three buttons MAG LINE SEL and CURSOR should be lit continuously and the other buttons should be lit one at a time in a walking pattern If the buttons are not lit check the 10 pin cable from the keypad to the Main board J29 If the cable is connected and good then replace the front panel assembly
40. move jack screws and Standard tool front panel standoffs 8 5 46 inch nut driver Used to remove nut on AC ground Standard tool lug 9 9 46 inch deep socket Used to remove rear panel BNC Standard tool 10 MA 800G Soldering Aid nuts Used to remove the front panel trim Standard tool spudger 11 Soldering iron 15 W Used for replacing Main board Standard tool fuses 12 Long nose pliers Used to compress connector lock Standard tool tabs The removal of most of the modules is a straightforward process and can be determined by a quick study of the exploded diagrams in the Replaceable Parts List in Section 5 The table below shows what to remove to access each module See Table 4 8 on page 4 17 To remove Power You must first remove Composite supply Main Front panel LCD assy Top cover X X X X X Board supports X X X Composite boards X Main board Power supply X Fan assembly X Front panel X X LCD assembly X X 1741C Waveform Monitor Service Manual Removal and Replacement Procedures Top Cover Board Supports Rear Panel Composite Boards Power Supply The top cover is a slip lock design 1 2 3 Remove the two T10 screws at the top cover front corners Remove the four T10 screws securing the top cover to the rear panel Slide the top cover back approximately inch and then lift it from the chassis The board supports span across the instrument holding the tops of the mo
41. n on preventing damage by electrostatic discharge Inspection and Cleaning Information and procedures for inspecting and cleaning the waveform monitor Troubleshooting Information for isolating and troubleshooting failed modules Included are instructions for operating the waveform monitor diagnostic routines and troubleshooting trees Most of the trees make use of the internal diagnostic routines to speed fault isolation to a module Removal and Replacement Procedures Information and procedures for removing and replacing modules in the instrument Repackaging Instructions Information on returning a waveform monitor for service Before servicing this product read the Safety Summary and Introduction at the front of the manual and the ESD information below A CAUTION Static discharge can damage any semiconductor component in the waveform monitor When performing any service that reguires internal access to the waveform monitor adhere to the following precautions to avoid damaging internal modules and their components due to electrostatic discharge ESD 1 2 Minimize handling of static sensitive circuit boards and components Transport and store static sensitive modules in their static protected containers or on a metal rail Label any package that contains static sensitive boards Discharge the static voltage from your body by wearing a grounded antistatic wrist strap while handling these modules Servi
42. nnections Burned circuit boards Burned broken or cracked circuit run plating Burned cracked broken blistered condition Repair action Remove and replace damaged circuit board Circuit boards Remove and replace damaged circuit board Resistors 1741C Waveform Monitor Service Manual 4 3 General Maintenance 44 Table 4 2 Internal inspection check list cont Item Inspect for Repair action Solder connections Cold solder or rosin joints Resolder joint and clean with isopropyl alcohol Capacitors Damaged or leaking cases Remove and replace Corroded solder on leads or terminals damaged circuit board Wiring and cables Loose plugs or connectors Burned broken or frayed wiring Firmly seat connectors Repair or replace modules with defective wires or cables Chassis Dents deformations and damaged hardware Straighten repair or replace defective hardware Cleaning Procedure Interior To clean the waveform monitor interior perform the following 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 STOP If after doing steps 1 and 2 a module is clean upon inspection skip the remaining steps
43. oduct 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 Parts modules and replacement products used by Tektronix for warranty work may be new or reconditioned to like new performance All replaced parts modules and products become the property of Tektronix 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 responsible 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 imprope
44. on signals 1 Tektronix part number 067 0465 00 AVC1 module for TG2000 2 75 coaxial cables 2 required General purpose digital video Belden 8281 Male to male BNC connectors 1 or 2 Tektronix part numbers 012 0159 00 or meters long 012 0159 01 75 Q Terminator 2 required Male connector precision Tektronix part number 011 0102 03 Test oscilloscope gt 2 GHz bandwidth with 75 Q input Tektronix TDS7404B with TCA75 adapter VGA to 5x BNC adapter cable 15 pin VGA connector input 5 BNC Tektronix part number 174 5126 00 connector outputs BNC splitter 1 female connector in 2 male connectors out 1 The required custom signals are provided on the User Documents CD These signals are also provided for an AVG1 module if an 067 0465 00 AVC1 is not available Download the PVCustomSignals zip file unzip it and install the signals on your TG2000 2 Note that the 067 0465 00 AVC1 is not available outside of Tektronix Other equipment can be substituted but it might not have sufficient accuracy to guarantee the specifications For hum insertion a general purpose sine wave generator can be used to terminate and drive back into the video signal through appropriate impedance matching 1741C Waveform Monitor Service Manual 3 1 Adjustments Procedures PixMon Composite Analog Input 3 2 DC Offset Restore Off 1 Connect a 100 IRE Flat Field video signal to the Cmpst A input Terminate the loop through in 75 Q 2 Push Input A to
45. ons and Accessories ccc cece nn eee ese see ese shes ere he nne nee 1 1 Configurations ii 1 1 Hardware Installation Sa sia 1 2 Product Upgrade EE 1 2 Operating u a aaa E e esse ne enne 1 2 Theory of Operation Theory Of Operations ccc een as ea E dataan h 2 1 Board RES 2 3 Front Panel A D 2 4 Composite Inputs hs litoral 2 4 usen 2 4 Power Supply and Distribution enne 2 4 Adjustment Procedures Adjustments SUITES 3 1 Required Equipment iia 3 1 POC UE pp DET 3 2 Maintenance General M intenancen ESTE SN TASK ISAS KEN Ai 4 1 Preventing ESD un SN SUN AKER NS Qasi 4 1 Inspection and Cleaning u a EAT u ee 4 2 een 4 5 Detailed Troubleshooting Procedures 4 9 1741C Waveform Monitor Service Manual 1 Table of Contents Removal and Replacement Procedures eee e eene 4 16 Preparation 4 16 Module Removal uu nennen 4 17 Repackaging Instr ctions u oer REF ve opel er le RR Rn aa aa qasaq 4 24 Packaging ET 4 24 Shipping to the Service an ana aa ener nnns 4 24 Replaceable Parts Replaceable Parts ainda 5 1 Parts Or
46. out to the right from the assembly 9 remove the other backlight repeat the previous four steps 1741C Waveform Monitor Service Manual 4 23 Repackaging Instructions Repackaging Instructions This section contains the information needed to repackage the waveform monitor for shipment or storage Packaging When repacking the instrument for shipment use the original packaging If the packaging is unavailable or unfit for use contact your local Tektronix representative to obtain new packaging Refer to Contacting Tektronix on the back of the Title page for the mailing address the email address and phone number Seal the shipping carton with an industrial stapler or strapping tape Shipping to the Service Center Contact the Service Center to get an RMA Return Material Authorization number and any return or shipping information you may need If the instrument is being shipped to a Tektronix Service Center enclose the following information m The RMA number m The owner s address m Name and phone number of a contact person m Type and serial number of the instrument m Reason for returning Acomplete description of the service required Mark the address of the Tektronix Service Center and the return address on the shipping carton in two prominent locations 4 24 1741C Waveform Monitor Service Manual Replaceable Parts Replaceable Parts This section contains a list of the replaceable modules for th
47. output is 5 Vpc Circuits convert this output to any other supply voltage that they require at the point of usage Fuses on the Primary supply 5 V output protect the Main board The secondary supplies and their tolerances are specified in the troubleshooting section The location of the supply test points is shown in the Maintenance section 1741C Waveform Monitor Service Manual Adjustment Procedures Adjustments The waveform monitor does not normally require any adjustments The adjustments which can be made are semi automated and should only be made while performing a Performance Verification Make the appropriate adjustment if the instrument fails one of these tests in the Performance Verification procedure m PixMon Output Level m Composite Analog Input DC Offset Restore Off m Composite Analog Vertical Measurement Accuracy or m Composite Analog Freguency Response m Composite Analog Freguency Response or m Channel Timing Match After making the adjustment shown here repeat the failed Performance Verification step Reguired Eguipment The following eguipment is reguired to complete all of the adjustment procedures Table 3 1 Reguired eguipment for adjustment Test Eguipment Reguirements Example XGA Monitor Computer monitor capable of 1024 x 768 x 60 Hz scan rate Video generator NTSC Black Tektronix TG2000 with BG1 and AVG1 NTSC 0 flat field modules NTSC 100 color bars Precision calibrati
48. power cord from the line voltage source Failure to do so could cause serious injury or death NOTE Read Equipment Required for a list of the tools needed to remove and install modules in this instrument See Table 4 7 on page 4 16 Read the cleaning procedure before disassembling the instrument for cleaning Equipment Required Most modules in the instrument can be removed with a screwdriver handle mounted with a size T10 TORX screwdriver tip All equipment required to remove and reinstall the modules is listed in the following table See Table 4 7 on page 4 16 Table 4 7 Tools required for module removal Item General Tool no Name Description number 1 Torque driver handle Accepts 1 4 inch hex bits 620 440 2 T10 TORX tip Used for removing most instrument 640 235 screws TORX driver bit for T10 size screw heads 1741C Waveform Monitor Service Manual Module Removal Table 4 8 Module removal Removal and Replacement Procedures Table 4 7 Tools required for module removal cont Item General Tool no Name Description number 3 T15 TORX tip Used for removing instrument 640 247 screws TORX driver bit for T15 size screw heads 4 1 Pozidriv tip Used for removing P1 bezel screws Standard tool 5 1 inch flat bladed Screwdriver for unlocking cable Standard tool screwdriver connectors 6 Angle Tip Tweezers Used to remove front panel knobs Standard tool 7 3 46 inch nut driver Used to re
49. r 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 WITH RESPECT TO THE PRODUCT 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 TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER 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 W2 15AUG04 Table of Contents General Safety 5 aa saa nenn Rd eu E E T NR een Service Safety SUMMA misessa jonas aaa vii Preface mussa ix Manual Conventions a ix Related Manuals x Introduction Introduction u eine ee dd Reli 1 1 Service Strategy nie A A iii 1 1 Specifications m E 1 1 Performance Verification esc sca tese epe rre SR Eee eque ves adu DR Ee d oes ied 1 1 Opti
50. reen to Save and Exit calibration mode Move the Multiburst signal to the Composite C input and terminate the loop through with a precision 75 Q terminator 1741C Waveform Monitor Service Manual 3 3 Adjustments Composite Board 1 to Composite Board 2 timing 34 9 Push Input C to select the Composite C signal and then repeat steps 3 through 7 10 Repeat the Composite Analog Freguency Response test in the Performance Verification procedure If the Channel Timing Match is outside the specification follow this adjustment procedure 1 Connect a 100 color bar signal from the precision generator to the Composite A and Composite C inputs using the BNC splitter Terminate both loop through inputs with precision 75 Q terminations Select Multi Channel Mode Enable both Input A and Input C and select Full Screen Vectors Adjust the timing match to overlay the Channel C color bar vectors onto the Channel A color bar vectors Follow the instructions at the bottom of the screen to Save and Exit calibration mode This ends the adjustment procedure To complete the process you should now perform a complete Performance Verification 1741C Waveform Monitor Service Manual Maintenance General Maintenance This section contains the information needed to perform periodic and corrective maintenance on the waveform monitor The following subsections are included Preventing ESD Preventing ESD General informatio
51. spect for Repair action Cabinet front panel and cover Cracks scratches deformations damaged hardware Repair or replace defective module Front panel knobs Missing damaged or loose knobs Repair or replace missing or defective knobs Connectors Broken shells cracked insulation and deformed contacts Dirt in connectors Repair or replace defective modules Clear or wash out dirt Carrying handle and cabinet feet Correct operation Repair or replace defective part Accessories Missing items or parts of Repair or replace damaged items bent pins broken or or missing items frayed frayed cables and damaged cables and defective connectors modules LCD Cracks Replace the LCD assembly Dirty Clean with glass cleaner Inspection Interior To access the inside of the waveform monitor for inspection and cleaning you will need to remove the top cover Inspect the internal portions of the waveform monitor for damage and wear using Table 4 2 as a guide Defects found should be repaired immediately If any circuit board is repaired or replaced see if it is necessary to adjust the waveform monitor See Table 4 2 on page 4 3 AN CAUTION To prevent damage from electrical arcing ensure that circuit boards and components are dry before applying power to the waveform monitor Table 4 2 Internal inspection check list Item Inspect for Loose broken or corroded solder co
52. t DSP1 Bus Input Perform secondary power supply checks Replace Main board Failures while running the advanced diagnostics cont Cmpst Mux Select Cmpst DC Rest Ctrl Cmpst Ref Mux Sel Cmpst Ref Clk Sel Display Cmpst Ctrls DSP1 Cpmst Tests DSP2 Cpmst Tests Review messages in diagnostic log Perform primary power supply checks Perform secondary power supply checks Run Advanced Diagnostics and look for other information Replace the Composite board No text or traces on LCD Perform LCD troubleshooting test Traces on LCD but not on Ext Display output Replace Main board 4 8 1741C Waveform Monitor Service Manual General Maintenance Table 4 4 Symptoms and causes cont Symptom Possible Sources or Recommended Detailed Troubleshooting Procedure to follow Functional Test Failures Performance Verification Test Failures In case of failure on either Functional or the Performance tests the board at fault is generally obvious Before replacing a board 1 Perform the primary and secondary power supply checks 2 Run the advanced diagnostics and check the diagnostic log for help in isolating the fault If this does not isolate the problem then replace the Main board if the test is in one of the following areas Composite m Ref m LTC XGA output m Color Palette m Remote I O Ethernet If the problem is Composite replace the composite board If the problem persists then replace
53. the product Component level repair by the customer is not supported The specifications for this product are in the Specifications and Performance Verification manual found on the 1741C Documents CD that ships with the product See page x Related Manuals Performance Verification The Performance Verification procedure for this product is in the Specifications and Performance Verification manual found on the 1741C Documents CD that ships with the product See page x Related Manuals Options and Accessories Configurations The lists of options and accessories for this product are found in the 1741C Waveform Monitor Quick Start User Manual that ships with the product See page x Related Manuals At introduction there are no configuration options offered for the 1741C Waveform Monitor 1741C Waveform Monitor Service Manual 1 1 Introduction Hardware Installation Product Upgrade Operating Information Power On Procedure Power Down Procedure The waveform monitor is shipped in a wrap around chassis which covers the instrument bottom and two sides A cover is installed on the chassis and the rear panel is made up of the module rear panel You can operate the waveform monitor in the instrument chassis the top cover must be installed for safety and for proper cooling or installed in an approved portable cabinet or rack adapter You can also install the waveform monitor in a custom installation such as a console
54. vice or adjustments of this product unless another person capable of rendering first aid and resuscitation is present Disconnect Power To avoid electric shock switch off the instrument power then disconnect the power cord from the mains power 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 1741C Waveform Monitor Service Manual Service Safety Summary Vill 1741C Waveform Monitor Service Manual Preface This manual supports servicing to the module level of the 1741C Waveform Monitor which processes video signals for display on an internal XGA LCD The instrument finds use as a monitor for broadcasting production and post production environments This manual explains how to troubleshoot and service the monitor to the module level The manual is divided into the following sections Manual Conventions Introduction provides a general product description and tells where to find product installation information Theory of Operation provides descriptions of the 1741C Waveform Monitor modules Adjustment Procedures details the adjustments that can be performed if the instrument is out of specification Maintenance tells you how to troubleshoot the product to the module l
55. y Power Supplies Checks 1741C Waveform Monitor Service Manual 4 9 General Maintenance General Checks Fan Failures Primary Power Supply Tests A m Front Panel Troubleshooting m Isolating Advanced Diagnostic Errors 1 Verify that the power cord is connected 2 Check that all internal cables are correctly connected and seated 3 Check for any discolored or burned components The Fan is controlled by both hardware and software Hardware controls the fan to a certain speed but software sets the speed target as a function of the temperature measured on a variety of temperature sensors If the fan fails then LED DS861 on the Main board will be lit The fan failure is sensed through tachometer feedback thus a fault will be asserted if the fan is not connected is stalled or if the tachometer feedback line is not working correctly If the fan fails the control circuit will increase the voltage to the 13 5 V max level The normal voltage to drive the fans pin 1 varies from about 6 V to 13 5 V in response to temperature and fan speed If the fan is not spinning measure the voltage on the fan connector J890 pin 1 If the voltage is near 13 V then replace the fan If the voltage is not above 10 V then replace the Main board If the fan is spinning but LED DS861 is lit the problem is probably the tachometer feedback line on pin 3 of the fan Inspect the wiring and pull up resistor R864 on the Main board and use the
56. y a boot time stamp followed by a list of power on tests If any failures are indicted then refer to the action as noted above To run the Advanced diagnostics push the CONFIG button then select Utilities gt Run Advanced Diags A series of tests will be run the exact tests will depend on which options are present in the instrument There are four distinct parts to the advanced diagnostic results screen a top section which shows Frequencies and Versions a middle section of Pass Fail tests a lower section which shows SDI and Video bus activity and finally narrow YRGB ramps at the very top and bottom to look for missing bits on the display interconnect Frequencies are shown in the Top Section read carefully These tests do not show a pass fail result even if zero Measurements are relative to the 25 MHz VGA clock Refer to Table below to see the limits for the frequencies See Table 4 6 The Middle section shows pass fail tests These are mainly bus tests between FPGAs Memory CPU etc Some tests cover busses from an option board to the Main board In this case it is difficult to tell which end is at fault Generally there will be multiple failures so the most likely cause is evident If not the best path may be to replace the option card first If that does not fix the problem then replace the Main board The last section of the Advanced Diagnostic Screen are the color ramps at the top and bottom of the screen These can be
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