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370B Programmable Curve Tracer Service Manual

1. 6 3 Table of Contents vi 370B Service Manual a ee General Safety Summary To Avoid Fire or Personal Injury 370B Service Manual 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 Use Proper Power Cord Use only the power cord specified for this product and certified for the country of use Use Proper Voltage Setting Before applying power ensure that the line selector is in the proper position for the power source being used Connect and Disconnect Properly 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 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 The common terminal is at ground potential Do not connect the common terminal to elevated voltages Do not apply a potential to any terminal incl
2. Check A7 STEP Step signal is GENERATOR BOARD OK Disconnect the connector Check step signal Check A19 LV SUPPLY i BOARD 200mV step 5 steps appears at Pin 3 of U200 Step signal is 7 STEP GENERATOR OK BOARD Check 1 MOTHER Step signal 1 BOARD and A3 A D appears at PIN 3 BOARD of J74 Check A D BOARD Check step signal 1V step 5 steps appears at Pin 3 of J74 on 7 STEP GENERATOR BOARD Step signal I appears at PIN 3 of A7 J74 Check A7 STEP GENERATOR BOARD 370B Service Manual Troubleshooting Tree cont 8 17 Connect DMM between AUX OUT and GROUND TERMINALs Check the reading of AUX OUT is conformity to the reading of DMM when AUX button Is pressed gt CONFIGURATION switch is OK 4 AUX OUTPUT OK Check 1 20 of AUX Check A33CONFIGURATION SUPPLY OUTPUT appears RELAY BOARD at TP380 on A3 A D BOARD gt Signal at A3 TP300 is OK Check A3 A D BOARD Signal at Pin 7 Check A7 STEP of AT J74 is GENERATOR BOARD OK Check J490 D SUB CONNECTOR 8 18 Troubleshooting Tree cont Connect GPIB controller 2 assert ID message and GPIB is get 370B answer OK Connect plotter and push PLOT button Check A22 GPIB INTERFACE Check A22 GPIB INTERFACE 370B Service Manual 2 WARNING LED is ON Check thermal switches 90 92 COVER SWITCHES 40
3. FLAT 14 KEY A15 CONFIGURATION LED P206 4PINS P210 3PINS VARIABLE COLLECTOR SUPPLY 4RIBBON S200 3RIBBON R210 W240 LOOPING COMPENSAT ION CIRCUIT BOARD INTERCONNECTIONS 8 6 370B Service Manual R600 V ZERO TP500 TP310 R610 R590 R360 R332 M R842 STORAGE GAIN H ZERO SG OFFSET X 1 BALANCE D A GAIN 8595 50928 aei dc EE i 4 DIGITAL DISPLAY A D J310 Establishment in shipping is pin 1 and 2 are connected PULSED OFFSET MODE R528 R554 Rad J310 is changed to make DC OFFSET MODE SY POSITION X GAIN ORTHOGONALITY pin 2 and 3 are connected R508 SX POSITION TP658 AD DISPLAY CONTROL 370B Service Manual Test Point and Adjustment Locations 1 8 7 8 8 R467 Ceres ase 325 R224 CURRENT LOOP BALANCE GAIN R310 SG ZERO R238 rA LOOPING srEP GENERATOR i BALANCE R270 R460 LEAKAGE COMP R139 R250 H BALANCE TAN DELTA V BALANCE R501 400V LOOPING R401 es P R412 R504 R502 CS GAIN 145 MEE ue CS OFFSET 16V LOOPING 80V LOOPING PINS R500 P62 LOOP BALANCE PIN1 R503 P62 2KV LOOPING A35 LOOPING COLLECTOR SUPPLY Test Point and Adjustment Locations 2 370B Service Manual A516 R500 zb us R420 ASTIG R410 GEOMETRY 02 964249 A19 V S
4. ee SERIES RESISTOR C5 B3 B2 B1 J8 J12 J13 J11 J4 W419 37 PINS P400 P490 SEE 434 FLAT W142 C RIBBON 4 P142 P104 2PINS 5P J104 P130 T200 COLLECTOR SUPPLY d ems 34 FLAT 2 a gt 1 INTERFACE 5 a gt x W105 J160 P160 490 40PINS P90 C6 40 FLAT 6 50 PINS m 2 414 W415 W4i6 W417 W418 RIBBONB RIBBON 6 RIBBON 10 SRIBBON 4 P414 P415 P416 P417 P418 419 NS 8 5 6PINS 10PINS SPINS J414 J415 J416 J417 J418 J419 J330 SEE Qe 4301 4140 P301 P140 W94 14 PINS J303 P303 Wa 4300 P300 I 218 1 lt 8 J308 P308 Li3001INPUT RELAY MODULE e 5 14 A10 SENSE WS A4 5 Tm BA A 7 A2 A1 4 C2 C1 P150 16 FLAT 150 c 400 SEE 402 SEE 370B Service Manual SWITCH 1 2 RIBBO W402 Wid COVER SWITCH 2 W400 P400 7 05800 DES SEE lt ES AGO L V RELAY W410 14PINS P330 w330 BAIBBON 4 W103 W104 RE 4 RES lt B in 891
5. Remove the securing screws Remove the chassis mounted board Replace chassis mounted boards in the reverse order of removal Be sure to match the index arrow or index mark on the multi pin connector to the corresponding arrow on the board NOTE To remove a specific circuit board other circuit boards chassis parts or panels may require removal If such is the case refer to the removal instructions for that assembly as required 1 Mother Circuit Board Remove and replace the 1 Mother circuit board as follows 1 2 Remove the top left and right cabinet panels from the main body Remove 2 4 and 5 circuit boards from the main body See the Plug In Boards removal instructions Remove the connectors for J10 J12 J110 J180 J190 7220 J400 1410 and J412 from the board Remove the connector for J60 from the 6 Collector Supply Output circuit board Remove the connector for J70 from the A7 Step Generator circuit board Remove the connector for J192 from the A19 L V Supply circuit board Remove the Al Mother circuit board by removing the eight screws from the board Replace the 1 Mother circuit board in the reverse order of removal 4 9 Maintenance 2 4 5 Plug in Boards Remove and replace the plug in boards as follows 1 Remove the top cabinet panel from the main body 2 Remove the two circuit board retainers 3 Remove the plug in board by pulling up on the eject
6. Collector Collector Sense Maximum output voltage Maximum output current Base Base Sense Maximum output voltage Maximum output current Emitter Emitter Sense Maximum output voltage Maximum output current Step Gen Out connector Maximum output voltage Maximum output current Aux Supply Connector Maximum output voltage and current Ext Base or Emitter Connector Maximum input voltage Maximum input current Performance Requirement Operating Information A 2000 V 20 400 V 20A 40V 20A 40V 2A 40 V 10 mA or 20 V 100 mA 40 V 2A 370B Service Manual Specifications Table 1 10 Power Supply Characteristic Performance Requirement Operating Information Rating Voltage 115 VAC 230 VAC Line voltage range 115 VAC High 107 VAC to 132 VAC Low 90 VAC to 110 VAC 230 VAC High 214 VAC to 250 VAC Low 180 VAC to 220 VAC Frequency Range 48 0 to 63 0 Hz Power Consumption Max 400 W 3 5 A Typical 120 W 1 3 A at 115 V 50 Hz Fuse 115 VAC 125 V 4 A Slow Blow 230 VAC 250 V 2 A Slow Blow Table 1 11 Surge Current Characteristic Description Surge Current 80 A peak 25 C for 5 line cycles after product has been turned off for at least 30 s Mechanical Specifications Table 1 12 Mechanical Specification Characteristic Operating Information Net Weight Standard instrument Dimensions Height 326 mm 12 8 in with feet 310 mm 12 2 in without fe
7. The Floppy Disk Circuit memorizes acquired data from the device under test and the 370B setting information The data and information are stored in the 3 5 inch floppy disk The Control and Processing Circuits consist of the following CPU Circuit Front Panel Circuit Floppy Disk Circuit Interface These circuits interface the microprocessor data with the printer and the peripheral equipment The circuit consists of the GPIB General Purpose Interface Bus interface Circuit and the Printer Control Circuit Power Supply These circuits supply low voltage operating power to the 370B These voltages in turn are used to generate the high voltages such as that used on the CRT There are two major circuits the Power Supply and the Interrupt Signal Generator The Power Supply converts the AC line voltages into DC voltages that supply power for 370B operation The Interrupt Signal Generator generates timer interrupt and power fail interrupt signals These signals synchronize the 370B circuits and provide a harmless shutdown when power fails 370B Service Manual 3 5 Theory of Operation Circuit Operation 3 6 Interconnection MPU Memory This part of the Theory of Operation provides a description of the electrical operation of the 370B The number enclosed in a diamond preceding a portion of text denotes the schematic diagram under discussion This circuit is located on the Al Mother Board The circuit connects inter boar
8. WIRE SET ELEC WIRE SET ELEC WIRE SET ELEC LEAD ELECTRICAL 18 AWG 3 5 L 5 4 CA ASSY SPELEC 34 28 AWG 1 30 0 L RIBBON CA ASSY SBELEC 9 26 AWG 7 5 L RIBBON CA ASSY SP ELEC 1 0 22 AWG 5 0 L RIBBON CA ASSY SPELEC 4 18 AWG 15 5 L CA ASSY SBELEC 6 22 AWG 20 0 L RIBBON WIRE SET ELEC CA ASSY SBELEC 2 18 AWG 7 0 L CABLE ASSY PWR 2 0 75MM SQ 250V 3A WIRE SET ELEC CABLE ASSY PWR 125V 1A 200MML CA ASSY SBELEC 2 26 AWG 30 0 L RIBBON CA ASSY SBELEC 2 26 AWG 22 0 L RIBBON CA ASSY SP ELEC 34 28 AWG 5 5 L RIBBON WIRE SET ELEC LEAD ELECTRICAL 26 AWG 28 0 L N 0 WIRE SET ELEC WIRE SET ELEC W D SUB CONN WIRE SET ELEC W D SUB CONN Mfr code 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 Mfr part number 119367400 119231001 159025900 159026000 198568300 198570000 196309900 196311000 196311201 196311100 196309801 174030400 174031000 198568001 198569600 198568000 198567900 198568200 198568100 198568101 196309600 174169300 174031400 174030900 174032800 174030800 198568600 174032700 161025501 198573300 161025701 174031300 174031200 174029600 198568500 196327000 198546800 198571400 198571300 370B Service Manual Diagrams Figure 8 1 370B c
9. A7 Step Generator Circuit Board Remove and replace the A7 Step Generator circuit board as follows 1 2 3 4 Remove the right cabinet panel from the main body Remove the connectors for J70 J72 and J74 from the board Remove the three screws located on the lower side of the board Remove the three screws fastening the heat sink of the board to the main body Support the board as these screws are removed so it does not fall and become damaged Remove the A7 Step Generator circuit board Replace the A7 Step Generator circuit board in the reverse order of removal A9 L V Relay Circuit Board and A35 Looping Circuit Board The A35 Looping circuit board is located on the A9 L V Relay circuit board Remove and replace the A9 L V Relay circuit board and the A35 Looping circuit board as follows 1 2 Pull out the drawer unit from the main body of the 370B Remove the guard box assembly cover from the drawer unit by removing the four screws NOTE When removing connectors from a board tag each one to prevent misconnection while reassembling Remove the connectors for J80 J82 J89 J90 J91 J92A J92B J93 J94 J95 J97 J98 J99 J150 P160 J400 and J410 from the A9 L V Relay circuit board Remove the connector for J90 from the A10 Sense circuit board which is located to the right of the A9 L V Relay circuit board Remove the six screws from the board and remove the two screws that secure the heat sink an
10. DISPLAY Mode HORIZONTAL VOLTS COLLECTOR SUPPLY POLARITY STEP GENERATOR Mode STEP AMPLITUDE NUMBER OF STEPS POSITION LEFT RIGHT STANDBY OUTPUTS Protective Cover Test Equipment Settings Digital Multimeter Mode NON STORE 2 V BASE EMITTER DC VOLTAGE 2V 10 DISPLAY LEFT ENABLED Closed DC Voltage NOTE See Test poit and Adjustment Location 1 for the locatin of the circuit board and jumper associated with this step Checking Step 0 and 1 7 Record the value of the digital multimeter reading 8 Change the following 370B setting 5 85 Performance Verification 5 86 MEASUREMENT Press the MESUREMENT REPEAT button to move the displayed spot 1 division to the right 9 Record the value of the digital multimeter reading 10 CHECK the reading value for Step 1 differs from the reading value for StepO within 2 000V 30 mV Checking Steps 2 through 10 11 CHECK that for each time the spot is advanced 1 division with the MEASUREMENT REPEAT button 12 Record the value of the digital multimeter reading 13 CHECK the voltage difference from the previous value are within 2 000 V 30 mV Checking INVERT 14 Change the following 370B setting STEP GENERATOR POLARITY INVERT On Step Generator output should be automatically return to Step 0 15 Record the value of the digital multimeter reading and CHECK the voltage difference for INVERT by repeating parts 7 through 13 For INVERT the
11. Manufacturers cross index Mfr code Manufacturer TKO191 TEKTRONIX JAPAN Ltd 80009 TEKTRONIX INC 370B Service Manual Abbreviations conform to American National Standard ANSI Y1 1 1972 Component Number A A23A2R1224 A23 2 R1234 Assembly number Subassembly Number Circuit Number optional Read Resistor 1234 of Subassembly 2 of Assembly 23 A list of assemblies is located at the beginning of the electrical parts list The assemblies are listed in numerical order When a part s complete component number is known this list will identify the assembly in which the part is located Chassis mounted parts and cable assemblies are located at the end of the Replaceable Electrical Parts List The table titled Manufacturers Cross Index shows codes names and addresses of manufacturers or vendors of components listed in the parts list Address City state zip code 5 9 31 KITASHINAGAWA TOKYO JAPAN 141 0001 SHINAGAWA KU TOKYO 14150 SW KARL BRAUN DR BEAVERTON OR 97077 0001 PO BOX 500 Electrical Parts List Replaceable electrical parts list Component Tektronix part Serialno Serial Mfr number number effective discont d amp description code Mfr part number Al 671 0236 02 CIRCUIT BD ASSY MOTHER 80009 671023602 A2 671 B126 01 CIRCUIT BD ASSY CPU 80009 671 12601 671 213 00 CKT BD ASSY A D 80009 671 21300 4 670 9306 04 CIRCUIT BD ASSY DIGITAL DISPLAY 80009 670930604 5 670 9307
12. tal Output Amplifier is discussed here This circuit is located on the A19 L V Supply board and the A27 Primary board This board consists of the Primary Circuit the Low voltage Power Supply Circuit and the Interrupt Generator Circuit This circuit supplies low voltage power for the 370B and generates the interrupt signals The H V Power Supply is located on the A20 H V REG board This circuit consists of the High voltage Generator Circuit the High voltage Regulator Circuit the Grid Bias and DC Restorer Circuit the Focus Amplifier and DC Restorer Circuit the Anode Multiplier Circuit the Rectifier Filter Circuit and the CRT Circuit This circuit provides the various high voltage operating potentials required by the CRT and displays the 370B data This circuit is located on the A22 GPIB Interface board The circuit consists of the Bus Buffer Circuit the Address Decoder Circuit the GPIB Address Switch the GPIB Controller Circuit the GPIB Bus Driver Circuit the Printer Controller Circuit and the Printer Bus Driver Circuit The function of this circuit is to transfer the microprocessor data to the printer and to communicates with other instruments via the bidirectional general purpose interface bus GPIB These functions are under control of the microprocessor and the communication handling software which are located on the A2 CPU board 3 11 Theory of Operation Configuration Relay lt 23 gt LOR Key lt 24 gt FDD Inte
13. 40 C Warranted characteristics are described in terms of quantifiable performance limits which are warranted 370B Service Manual 1 3 Specifications Electrical Specifications Table 1 1 Collector Supply Characteristic Performance Requirement Operating Information Polarity LEAKAGE Applies positive DC voltage to the collector or base terminal Measures emitter current Sensitivity is increased 1000 times DC Applies positive DC voltage to the collector or base terminal Measures collector or base current Applies positive swept voltage to the collector or base terminal Measures collector or base current AC Applies line frequency sine wave to the collector or base terminal Measures collector or base current Applies negative swept voltage to the collector or base terminal Measures collector or base current DC Applies negative DC voltage to the collector or base terminal Measures collector or base current LEAKAGE Applies negative DC voltage to the collector or base terminal Measures emitter current Sensitivity is increased 1000 times DC mode ripple Less than 2 of output voltage VARIABLE COLLECTOR SUPPLY at 30 or no load higher Less than 0 5 of output voltage VARIABLE COLLECTOR SUPPLY at 30 or less 1 4 370B Service Manual Specifications Table 1 1 Collector Supply Cont Characteristic Performance Requirement Operating Information Max peak volts Max Peak Voltage
14. 7 211 0729 XX 8 SCR ASSEM WSHR 6 32 X 0 437 PH STL 0435 ORDER BY DESC END ATTACHING PARTS CKT BOARD ASSY INCLUDES 23 196 3301 00 1 LEAD ELECTRICAL 18 AWG 6 0 L W LUG A9W10 80009 196330100 25 671 1147 03 1 BOARD ASSY LOOPING A35 80009 671114703 26 211 0751 XX 1 SCR ASSEM WSHR M3 X 8 80009 2110751 27 342 0895 XX 1 INSULATOR POLYCARBONATE LV CKT BD 80009 3420895 ATTACHING PARTS 28 210 3110 XX 4 RIVET SOLID 5 5MM L X 3 4MM OD TRUSS NYLON TKOBK 27 0601 29 210 1475 XX 301393 301917 4 WASHER PLAIN 3 56 ID X 7 94 OD X 0 8 THK 80009 2101475 END ATTACHING PARTS 30 671 1140 01 1 BOARD ASSY LOR RELAY A34 80009 671114001 ATTACHING PARTS 31 211 0504 XX 6 SCREW MACHINE 6 32 X 0 250 PNH STL TK0435 ORDER BY DESC END ATTACHING PARTS CKT BOARD ASSY INCLUDES 32 198 5688 00 1 WIRE SET ELEC A34W89 80009 198568800 33 196 3276 00 1 LEAD ELECTRICAL 18 AWG 37 0 L 9 N A34W94 80009 196327600 34 198 5687 00 1 LEAD ELECTRICAL A34W97 80009 198568700 35 211 0751 XX 2 SCR ASSEM WSHR M3 X 8 80009 2110751 36 119 3414 02 1 HIGH V MODULE W 18 RELAYS U800 80009 119341402 ATTACHING PARTS 37 211 0504 XX 4 SCREW MACHINE 6 32 X 0 250 PNH STL 0435 ORDER BY DESC END ATTACHING PARTS 38 210 0457 XX 1 NUT PLASSEM WA 6 32 X 0 312 STL TK0435 ORDER BY DESC 39 307 1541 01 1 RES FXD FILM 1 1 OHM TO 25K OHM 2 W CONN R400 80009 307154101 ATTACHING PARTS 40 211 0504 XX 4 SCREW MACHINE 6 32 X 0 250
15. ATTACHING PARTS 40 211 0661 XX 2 SCR ASSEM WSHR 4 40 X 0 25 PNH STL TK0435 ORDER BY DESC END ATTACHING PARTS 41 354 0347 1 RING CRT CLAMP 2 127 ID X 2 595 OD 0 563 0JRO5 ORDER BY DESC ATTACHING PARTS 42 211 0170 XX 2 SCREW MACHINE 4 40 X 2 25 PNH SST TK0435 ORDER BY DESC 43 214 1333 XX 2 SPRING HLCPS 0 213 OD X 0 375 CLE CU BE 8X345 ORDER BY DESC END ATTACHING PARTS 44 343 0205 XX 1 RTNR ELCTRN TU 3 0 DIA X 1 5 L DELRIN 80009 3430205 ATTACHING PARTS 45 211 0578 XX 4 SCREW MACHINE 6 32 X 0 438 PNH STL 0435 ORDER BY DESC 46 210 0949 XX 4 WASHER FLAT 0 141 ID X 0 5 OD X 0 062 BRS 12327 ORDER BY DESC END ATTACHING PARTS 47 196 3099 00 1 LEAD ELECTRICAL 24 AWG 10 0 L W14 80009 196309900 48 119 2162 01 1 HV MODULER 2kV INPUT 12kV OUTPUT 80009 119216201 49 366 0625 XX 5 KNOB SILVER GRAY 9 5MM OD 80009 3660625 50 358 0378 XX 3 BUSHING SLEEVE 0 131 ID X 0 18 OD X 0 125L 80009 3580378XX 51 366 0620 XX 3 KNOB SILVER GRAY 25MM OD 80009 3660620 52 333 429 00 1 PANEL FRONT 370B 80009 3333715XX 53 210 0586 XX 2 NUT PLASSEM WA 4 40 X 0 25 STL TK0435 ORDER BY DESC END ATTACHING PARTS 54 378 0349 XX 1 FILTER LED DSPL GRAY 10 8 amp 18 3M PC 80009 3780349 55 378 0277 XX 1 FILTER LT CRT SMOKE GRAY 80009 3780277 56 351 0853 1 GUIDE PB 370B MAIN KEY BD PC 80009 3510853XX 9 12 370B Service Manual Mechanical Parts List Replaceable mechanical parts list Cont Fig amp index Tektro
16. P 0 BOX 2938 4300 S RACINE AVE 1775 NW 216TH 1217 FOURTH AVE N P BOX 50934 97 THORNWOOD RD 4805 SE 26TH HATTONS ROAD OFF WESTINGHOUSE RD TRAFFORD PARK 3501 PORTLAND ROAD NE 2682 W COYLE AVENUE 14181 SW MILLIKAN WAY 3000 LEWIS AND CLARK HWY 810 SE SHERMAN 3191 CASITAS 2701 W EL SEGUNDO BLVD 9301 ALLEN DR 12055 ROJAS DRIVE SUITE K City state zip code SUMMERSET NJ 08873 TOKYO JAPAN TOKYO JAPAN TOKYO JAPAN TOKYO JAPAN TOKYO JAPAN KANAGAWA JAPAN SHIZUOKA JAPAN TOKYO JAPAN TOKYO JAPAN TOKYO JAPAN 141 0001 TORRANCE CA 90509 CHICAGO IL 60609 3320 HILLSBORO OR 97123 KENT WA 98031 PALO ALTO CA 94303 STAMFORD CT 06903 2617 PORTLAND OR 97202 MANCHESTER M17 1DF ENGLAND SALEM OR 97303 ELK GROVE VILLAGE IL 60007 BEAVERTON OR 97077 VANCOUVER WA 98661 2999 PORTLAND OR 97214 LOS ANGELES CA 90039 2410 HAWTHORNE CA 90250 3318 CLEVELAND OH 44125 4632 EL PASO TX 79936 9 3 Mechanical Parts List Manufacturers cross index Cont Mfr code 13103 73743 78189 8X345 80009 83486 86928 93907 99742 9 4 Manufacturer THERMALLOY CO INC FISCHER SPECIAL MFG CO ILLINOIS TOOL WORKS INC SHAKEPROOF DIV NORTHWEST SPRING amp MFG CO TEKTRONIX INC ELCO INDUSTRIES INC SEASTROM MFG CO INC TEXTRON INC CAMCAR DIV PERMACEL TAPE DIV AN AVERY CO Address 2021 W VALLEY VIEW LN PO BOX 810839 111 INDUSTRIAL RD ST CHARLES ROAD 5858 SW WILLOW LANE 14150 SW KARL BRAUN
17. Supplies a reference voltage to the 370B Used throughout the checks and adjustments to measure voltage current and resistance Used to examine 2400 V Used to perform internal adjust ments Banana plug with cap Used to hold resisters and probe hooks POZIDRIV length 8 1 2 inch Used to remove panels and Point size 1 2 High Voltage shield cover Banana Plug Jack to Banana Used throughout the procedure Plug Jack Voltage range 0 3 kV DC Used to examine 2400 V Fluke 80K 6 AC Accuracy 1 2 2 Used throughout the procedure Fluke Y8131 To check emitter accuracy e collector accuracy in 500 mA 1 2A range horizontal display noise base input impedance step generator accuracy in 100 mA and 200 mA range step generator ripple To adjust step generator Example of Applicable Test Equipment a Tektronix 2445B 150 MHz Oscilloscope with P6137 Probe b Refer to Tektronix Products catalog for compatible equip ment Fluke 5101B 8 Fluke 8505A Option 02A 03 b Keithley 195A W OP 1950 Tektronix DM501A Tektronix part number 003 0489 00 Tektronix part number 134 0016 01 and 134 0198 00 Tektronix part number 003 0293 00 Tektronix part number 198 5621 00 and 198 5625 00 Tektronix part number 067 1337 00 370B Service Manual Performance Verification Table 5 3 Test Equipment Cont Item 11 Transistor 12 Printer 13 Controller 14 Floppy
18. board 2 EXAMINE the digital multimeter reading at the 5 test point and each of the other power supply test points listed in Table 5 4 for voltage levels within the given deviation Examining Ripple 3 Disconnect the digital multimeter and connect the test oscilloscope to the 5 test point 4 EXAMINE the test oscilloscope display at each of the test points listed in Table 5 4 for ripple displays within the given deviation Removing Setup 5 Disconnect the test oscilloscope Table 5 4 Voltage Regulation and Ripple 5 13 Performance Verification A2 Adjusting PLL Digital Multimeter 370B settings Initialize 370B Test Equipment Settings Digital Multimeter Mode DC Voltage 1 Connect the Digital Multimeter test leads to A GND test point and 9 pin of U100 2 In case that the frequency of line power supply is 50 Hz adjust R473 PLL 1 adjustment on the A D board for a digital multimeter readout of 2 2 0 1 V 3 Incase that the frequency of line power supply is 60 Hz adjust R104 PLL FREQ 1 adjustment on the A3 A D board for a digital multimeter readout of 3 1 0 1 V 4 Connect the Digital Multimeter test leads to A GND test point and 9 pin of U470 5 In case that the frequency of line power supply is 50 Hz adjust R473 PLL FREQ 2 adjustment on the A3 A D board for a digital multimeter readout of 2 2 0 1 V 6 Incase that the frequency of line power supply is 60 Hz adjust R104 PL
19. 0770 XX 2 GUIDE TEST FXTR BOTTOM 80009 3510770 ATTACHING PARTS 45 211 0038 XX 6 SCREW MACHINE 4 40 X 0 312 FLH STL TK0435 ORDER BY DESC END ATTACHING PARTS 46 441 1739 XX 1 CHAS CRV TRACER BOTTOM 80009 4411739 ATTACHING PARTS 47 211 0541 XX 2 SCREW MACHINE 6 32 X 0 25 FLH STL TK0435 ORDER BY DESC END ATTACHING PARTS 48 390 0987 XX 1 CABINET BOTTOM 80009 3900987 ATTACHING PARTS 49 211 0007 XX 6 SCREW MACHINE 4 40 X 0 188 PNH STL TK0435 ORDER BY DESC END ATTACHING PARTS 50 390 1088 XX 1 CABINET TOP ALUMINUM 80009 3901088 ATTACHING PARTS 51 211 0504 XX 1 SCREW MACHINE 6 32 X 0 250 PNH STL 0435 ORDER BY DESC END ATTACHING PARTS 52 426 2136 XX 1 FRAME SECT CAB REAR AL 80009 4262136XX 9 6 370B Service Manual Mechanical Parts List Replaceable mechanical parts list Cont Fig amp index number 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 370B Service Manual Tektronix part number 390 0985 XX 211 0504 XX 333 A428 00 211 0507 XX 343 1272 XX 213 0782 XX 200 3300 XX 129 1126 XX 378 0278 XX 200 3277 XX 211 0008 XX 343 1271 XX 213 0782 XX 119 2310 01 210 0457 XX 161 0257 01 129 A590 00 361 0704 XX 342 A149 00 671 B127 01 211 0871 00 671 B127 01 174 0295 00 342 0782 XX Serial no effective Serial no discont d Qty Name amp description CABIN
20. 100 as the VARIABLE COLLECTOR SUPPLY control is rotated clockwise 7 Set the OUTPUTS to DISABLED 8 EXAMINE that the displayed trace goes back to lower left corner and that the OUTPUT DISABLED message appears for a few seconds in the lower left corner of the display 9 Set the OUTPUTS to ENABLED 10 EXAMINE that the OUTPUT ENABLED message appears in the the lower left corner of the display for a few seconds Examining DC POLARITY 11 Change the following 370B and Test Equipment settings 370B COLLECTOR SUPPLY DC POLARITY VARIABLE COLLECTOR 100 SUPPLY Test Oscilloscope Vertical 5 Vidiv DC Trigger Mode auto 12 Connect the Test Oscilloscope as shown in Figure 5 9 and close the Protective Cover To Left Collector To 370B Ground Jack Figure 5 9 Examining for DC and LEAKAGE operation 5 113 Performance Verification 5 114 13 EXAMINE the display for the spot to move from the lower left corner along the bottom horizontal graticule line as the VARIABLE COLLECTOR SUPPLY control is rotated clockwise to 100 46 14 EXAMINE the Test Oscilloscope display for DC Examining LEAKAGE POLARITY 15 Change the following 370B setting COLLECTOR SUPPLY LEAKAGE POLARITY 16 EXAMINE the display for the spot to position the same as in part 13 17 EXAMINE the Test Oscilloscope display for DC Examining AC POLARITY 18 Change the following 370B settings COLLECTOR SUPPLY AC POLARITY VARIAB
21. 16 V 80 V 400 V 2000 V Selected by the MAX PEAK VOLTS buttons Voltage accuracy Peak open circuit voltage on all ranges within At MAX PEAK POWER of 50 W 15 0 In PULSE mode of STEP GENERATOR available current is two times of DC mode Peak Volts 16 V 400V 200V In PULSE mode of STEP GENERATOR Range 10A 0 05 A available current is two times of DC mode Max Peak Curent 20A Selection of 0 26 Q 1 3 Q 6 4 Q 32 Series Resistance Available 160 800 Q 4 20 100 Min Max Resistance 16 V 80 V 400 V 2000 V 500 kQ 2 5 MQ 12 5 MO Peak Volts Range Current Available Minimum 0 26 series resistance 2 Maximum 800 20k 500 k 12 5 M series resistance 2 Resistance Accuracy Within 5 or 0 2 Q Peak power watts Available 16 80 and 220 W 50 W 10 W 2 W 0 4 W 0 08 W Derived from nominal peak open circuit collector voltage and nominal series resistance values ZU range V V 4R for lt 220 W 2000 V range 50 W 10 W 2 W 0 4 W 0 08 W P V I R l for 220 W Variable collector supply 0 100 096 of maximum peak voltage value is displayed in the CRT readout area Provides uncalibrated variable collector supply amplitude control from 0 to 10096 in 0 196 increments Safety interlocks The protective cover must be in place over test terminals and lid shut before voltage can be applied to the terminals When protective cover is open collector supply is not opera
22. 18 gt CRT Output Amplifier lt 19 gt Power Supply lt 20 gt H V Power Supply lt 21 gt GPIB amp Printer Interface 370B Service Manual lt 22 gt board and the A12 Sub Key board set up VERTICAL HORIZONTAL and STEP AMPLITUDE settings and control focus and intensity etc This circuit is located on the 12 Sub Key board and consists of the Front Panel Display Circuit and the Front Panel Key Matrix Circuit The circuit is controlled by the 11 Main Key board displays the Main Key setting information and transfers key input data from the key matrix This circuit is located on the A15 Configuration LED board and consists of LEDs and associated components LEDs display the CONFIGURATION setting information When the microprocessor reads address A8030 HEX the CONFIGURATION key status is read into the microprocessor This circuit is located on the A18 CRT Output board and consists of the Horizontal Output Amplifier the Vertical Output Amplifier and the Z axis Amplifier The Horizontal and Vertical Output Amplifiers convert current signals from the preamplifier of the A5 Display Control board into deflection plate driving voltages for the CRT The Z axis Amplifier converts the current signal from the unblanking logic of the A5 Display Control board into the driving voltage for the Grid Bias and DC Restorer Circuit of the A20 H V REC board The Horizontal and Vertical Output Amplifiers are similar so only the Horizon
23. 2500 060 56 343 1288 1 CLAMP CABLE PLASTIC 80009 3431288 57 211 0504 XX 1 SCREW MACHINE 6 32 X 0 250 PNH STL 0435 ORDER BY DESC 9 30 370B Service Manual Mechanical Parts List Replaceable mechanical parts list Cont Fig amp index Tektronix part Serialno Serial no Mfr number number effective discontd Qty description code Mfr part number 7 1 441 1919 XX 1 CHAS TEST FXTR MAIN AL 80009 4411919 2 342 0776 XX 1 INSULATOR FILM 370B 80009 3420776XX 3 344 0396 XX 1 CLIP CABLE PVC 80009 3440396 4 343 0549 XX 1 STRAP TIEDOWN E 0 098 W X 4 0 LZYTEL 1499 HW 047 5 351 0774 XX 3 GUIDE SLIDE PWR SW POLYCARBONATE 80009 3510774 ATTACHING PARTS 6 211 0038 XX 3 SCREW MACHINE 4 40 X 0 312 FLH STL TK0435 ORDER BY DESC END ATTACHING PARTS 7 384 1703 1 EXTENSION SHAFT PWR SW 80009 3841703 8 214 3420 XX 1 SPRING HLCPS 10 0MM OD X 9 5MM L CLE SST 80009 2143420 9 366 1767 1 PUSH BUTTON BLACK GREEN INDICATOR 80009 3661767 10 122 0181 1 ANGLE RAIL LEFT 80009 1220181 ATTACHING PARTS 11 211 0502 XX 4 SCREW MACHINE 6 32 X 0 188 FLH STL 0435 ORDER BY DESC END ATTACHING PARTS 12 122 0182 XX 1 ANGLE RAIL RIGHT 80009 1220182 ATTACHING PARTS 13 211 0502 XX 4 SCREW MACHINE 6 32 X 0 188 FLH STL 0435 ORDER BY DESC END ATTACHING PARTS 14 441 1920 XX 1 CHAS TEST FXTR ALUMINUM MID 80009 4411920 ATTACHING PARTS 15 211 0538 XX 7 SCREW MACHINE 6 32
24. 3 Remove any connector s attached to the outside of the rear panel at the IEEE STD 488 PORT the PRINTER INTERFACE PORT or the AC INPUT 4 Remove the six screws securing the rear panel 5 Pull the rear panel out and carefully lower it away from the main body Do not stretch any connector wires inside the panel NOTE When removing connectors from a board tag each one to prevent misconnection while reassembling 6 Remove the following connectors from inside the rear panel J270 and J274 from the A27 Primary circuit board P16 and P18 from the FL100 Filter NOTE Remove the A2 CPU and the A3 A D circuit boards before the next step See the Plug in Boards removal instructions J220 from the A1 Mother circuit board Both ground wires from the main body chassis 7 Remove the rear panel NOTE Removal of the A22 Interface circuit board the A27 Primary circuit board or the B100 Cooling Fan is described later in this section To remove one of these circuit boards or the fan from the rear panel see the removal instruc tions for that component 8 Replace the rear panel in the reverse order of removal 370B Service Manual 4 5 Maintenance Connector Replacement 1 The 370B uses many types of connectors some of them are very similar in appearance Tag each connector before removing to avoid confusing one connector with another Some connectors have latches to prevent erroneous removal during op
25. A10 Sense board to align the display with the horizontal graticule line using the LOOPING COMPENSATION control Readjusting LOOP BALANCE 16 Change the following 370B settings COLLECTOR SUPPLY MAX PEAK POWER 0 08 W WATTS 17 READJUST R500 LOOP BALANCE on the A35 Looping Board to align the display with the horizontal graticule line using the LOOPING COM PENSATION control If necessary repeat steps 14 through 17 370B Service Manual 5 41 Performance Verification 5 42 Examining 400 V LOOPING 18 Change the following 370B settings DISPLAY HORIZONTAL VOLTS DIV 50 V COLLECTOR COLLECTOR SUPPLY 400 V MAX PEAK VOLTS VARIABLE COLLECTOR 100 96 SUPPLY LOOPING COMPENSATION Minimum trace width 19 EXAMINE the left end of the displayed trace for optimum overlay of the trace If the left end of the trace doesn t overlay correctly the following adjustment is necessary Adjusting 400 V LOOPING 20 ADJUST R501 400 V LOOPING adjustment on the A35 Looping board for optimum overlay of the left end of the trace Examining 80 V LOOPING 21 Change the following 370B settings DISPLAY HORIZONTAL VOLTS DIV 10 V COLLECTOR COLLECTOR SUPPLY 80V MAX PEAK VOLTS VARIABLE COLLECTOR 100 96 SUPPLY LOOPING COMPENSATION Minimum trace width 22 EXAMINE the left portion of the displayed trace for optimum overlay see Figure 5 2 If the overlay is not optimum the following adjustment is necessary Adjusting
26. DIV 1 uA COLLECTOR HORIZONTAL VOLTS DIV 200 V COLLECTOR COLLECTOR SUPPLY 2000 V MAX PEAK VOLTS POSITION DISPLAY OUTPUTS ENABLED VARIABLE COLLECTOR 100 96 SUPPLY PEAK POWER WATTS 50W Protective Cover Closed 1 Press the up Position Control button to move the trace to graticule center NOTE Following adjustments from 2 to f are preliminary adjustment 5 38 370B Service Manual Performance Verification 370B Service Manual Preliminary Adjustment 2 Preset the following 370B adjustments A10R139 TAN DELTA center A10R224 LOOP GAIN center A cutout in the right siderail provides adjustment access A cutout in the right side of the guard box provides adjustment access 3 ADJUST R503 2000 V LOOPING adjustment on the A35 Looping board for overlapping of the loop using LOOPING COMPENSATION control 4 ADJUST R500 LOOPING BALANCE adjustment on the A35 Looping board to minimize the vertical projection of the left portion of the loop using the LOOPING COMPENSATION control 5 ADJUST R139 TAN DELTA on the A10 Sense board to align the display with the horizontal graticule line using the LOOPING COMPENSATION control 6 Change the Max Peak Power Watts from 50 W to 0 08 W 7 ADJUST R224 LOOPING GAIN adjustment on the A10 Sense board to minimize the vertical projection of the left portion of the loop using the LOOPING COMPENSATION control 8 Change the Max Peak Power Watts from 0 08 W to 50 W 9 R
27. Disk 15 Test Adapter 16 Extended Cable 370B Service Manual Minimum Specification Purpose Example of Applicable Test Equipment 2N3904 Used as DUT for acquisition of Tektronix part number curve data 151 0190 00 NEN Used to check the printer inter CBM model iDP3240 face GPIB Support Used to check the GPIB a IBM PC with Tektronix GURU card running BASICA b IBM PC with National Instru ments PC2 or PC2A card running BASICA c Hewlett Packard 200 or 300 Series Scientific Computer running 200 or 300 BASIC 3 5 inch 2HD Used to store displayed curve data and instrument settings Used to hold the DUT Tektronix A1007 Operate instrument with drawer Tektronix part number unit detached 067 0187 00 5 11 Performance Verification Power Supply Equipment Required see Table 5 3 m Digital Multimeter m Test Oscilloscope 1 Examining Voltage NOTE The characteristics examined in this step are examples of typical Deviation and Ripple instrument operation they are not specifications Oscilloscope See Table 5 4 To 370B Ground Jack 370B settings Initialize 370B Test Equipment Settings Digital Multimeter Mode DC Voltage Test Oscilloscope Vertical Sensitivity 20 mV div Time 5 ms div Trigger Auto 5 12 370B Service Manual Performance Verification 370B Service Manual Examining Voltage Deviation 1 Connect the digital multimeter to the 5 test point on the 19 LV Supply
28. Display RAM check Acquisition RAM check LED check Display quality check Push button test To exit this diagnostic routine press the FAST SHIFT button m System ROM Check After confirming that the boot ROMs are in the correct sockets the 370B diagnoses the boot ROMs by checksum If a boot ROM fatal error is found such as misinsertion the memory index display blinks with 0 and 1 When checksum error is found the error message is displayed on the error message area of the CRT The format of this messages is as follows ROM 000X When X is the hexadecimal number whose bit 1 through bit 4 respectively indicates the error status of boot ROMs 4 23 Maintenance m System RAM Check The 370B checks the system RAM by read write operation If a system RAM fatal error is found such as bus shorted the memory index display blinks with 0 and 2 When read write errors are found the error message is displayed on the error message area of the CRT The format of this message is as follows RAM XXXXX YYYY Where XXXXX is a hexadecimal representation of the address of the RAM in error and YYYY is a hexadecimal representation of error bits in that address for example error message RAM 00000 0018 indicates that a read write error is detected in bit 4 and bit 5 of the system RAM at address 00000 In the above cases the 370B does not advance the diagnostics routine m Display RAM Check The 370B checks the Display RAM
29. Mode Line 22 Connect a test leads with banana plug to the LEFT B jack Connect a probe hook from the Test Oscilloscope to the test lead clip and the ground lead to to the Ground jack 23 Close the Protective Cover and turn the VARIABLE COLLECTOR SUPPLY control 24 EXAMINE the test Oscilloscope for rectified waveform to be displayed Removing the Setup 25 Change the following 370B setting LEFT RIGHT STANDBY STANDBY 26 Disconnect the Test Lead and Probe from the 370B NOTE The characteristics examined in this step are examples of typical instrument operation they are not specifications Test Oscilloscope Q Qj 370B Ground Jack 5 127 Performance Verification 5 128 370B settings Initialize the 370B then set the following controls as indicated STEP GENERATOR Mode VOLTAGE STEP AMPLITUDE 1V CONFIGURATION EMITTER STEP GEN OUTPUTS ENABLED Protective Cover Closed Test Equipment Settings Test Oscilloscope Vertical Sensitivity 2 DC Horizontal 10 ms div Trigger Mode Auto Trigger Slope Examining Internal Operation for LEFT 1 EXAMINE the test oscilloscope display for a step waveform Examining Internal Operation for RIGHT 2 Connect the test oscilloscope between the RIGHT E Emitter and ground jacks and close the protective cover 3 EXAMINE the test oscilloscope display for a step waveform Examining External Operation 4 Change the f
30. PNH STL 0435 ORDER BY DESC END ATTACHING PARTS 41 260 2328 01 1 SWITCH THRMSTC NC OPEN 70 0 3 0 A 250V S90 3385 5003F70B1 GUL ATTACHING PARTS 42 211 0008 XX 2 SCREW MACHINE 4 40 X 0 25 PNH STL TK0435 ORDER BY DESC END ATTACHING PARTS 48 198 5696 00 1 WIRE SET ELEC W93 80009 198569600 44 441 1922 XX 1 CHAS TEST FXTR GUARD BOX ALUMINUM 80009 4411922 ATTACHING PARTS 370B Service Manual 9 29 Mechanical Parts List Replaceable mechanical parts list Cont Fig amp Tektronix part Serialno Serial no Mfr number number effective discontd Qty amp description code Mfr part number 45 211 0511 XX 8 SCREW MACHINE 6 32 X 0 5 PNH STL TK0435 ORDER BY DESC 46 210 0803 XX 8 WASHER FLAT 0 15 ID X 0 375 OD X 0 032 STL 12327 ORDER BY DESC END ATTACHING PARTS 47 342 0774 XX 8 INSULATOR BSHG 4MM ID X 6MM THK 16MM OD 80009 3420774XX 48 361 1380 XX 8 SPACER RING 3MM L X 8 1MM ID 80009 3611380 49 220 0105 XX 2 NUT BLOCK 4 40 X 5 5MM BRS 019 2200105 ATTACHING PARTS 1 50 211 0661 XX 2 SCR ASSEM WSHR 4 40 X 0 25 PNH STL TK0435 ORDER BY DESC END ATTACHING PARTS 51 344 0395 XX 1 CLIP CABLE NYLON 80009 3440395 52 344 0396 2 CLIP CABLE PVC 80009 3440396 53 348 0949 XX 1 GROMMET PLASTIC BLACK RING 15MM ID 80009 3480949XX 54 255 1108 1 PLASTIC CHANNEL 1000 X 4 4 X 5 0MM NYLON 80009 2551108 55 255 0334 1 PLASTIC CHANNEL 12 75 X 0 175 X 0 155 NYLON 11897 122 NN
31. Protective Cover Closed Checking 16 Max Peak Volts 1 CHECK the horizontal CURSOR readout for a reading within the limits given in Table 5 15 for 16 MAX PEAK VOLTS 370B Service Manual Performance Verification Checking 80 400 2000 MAX PEAK VOLTS 2 Change the following 370B settings DISPLAY HORIZONTAL VOLTS DIV 10 V COLLECTOR COLLECTOR SUPPLY MAX PEAK POWER 80 WATTS VARIABLE COLLECTOR 100 96 SUPPLY 3 CHECK the horizontal CURSOR readout for a reading within the limits given in Table 5 15 for 80 MAX PEAK VOLTS 4 CHECK that the horizontal CURSOR readout is accurate within the limits given in Table 5 15 by repeating steps 2 and 3 for each HORIZONTAL VOLTS DIV and MAX PEAK VOLTS setting in Table 5 15 MAX PEAK POWER WATTS should automatically change to 50 when the MAX PEAK VOLTS setting is changed from 400 to 2000 If not within these limits the following adjustment is necessary Adjusting Collector Supply Gain 5 Change the following 370B settings 370B settings DISPLAY HORIZONTAL VOLTS DIV 2 V COLLECTOR COLLECTOR SUPPLY MAX PEAK POWER 16 VOLTS MAX PEAK POWER 220 WATTS WATTS CURSOR Mode DOT VARIABLE COLLECTOR 100 96 SUPPLY 6 ADJUST CS Gain adjustment R401 on the A6 Collector Supply Board for a horizontal CURSOR readout of 17 2 V R401 can be adjusted through the access hole in the protective shield 7 Recheck from 1 to 4 370B Service Manual 5 107 Performance Verification Table 5
32. R600 so that the vertical CURSOR readout for a reading may not change NOTE The characteristics examined in this step are provided as examples of typical instrument operation to aid in the adjustment of R610 they are not specifications 370B settings Initialize the 370B then set the following controls as indicated DISPLAY Mode CAL ZERO CURSOR Mode DOT 5 29 Performance Verification CAL ZERO is initiated by pressing the NON STORE button while holding down the FAST SHIFT button Determining Adjustment is Necessary 1 EXAMINE the vertical and horizontal CURSOR readouts for readings of 0 00 0 06 If the CURSOR readouts are not within these limits the following adjust ment is necessary Adjusting Storage Gain 2 ADJUST Storage Gain adjustment R610 on the A3 A D Board for Vertical and Horizontal CURSOR readouts of 0 00 Examining Storage Gain for CAL FULL 3 Change the following 370B setting DISPLAY Mode CAL FULL CAL FULL is initiated by pressing the REF button while holding down the FAST SHIFT button 4 EXAMINE the vertical and horizontal CURSOR readout for a reading of 20 00 0 36 Removing the Setup 5 Change the following 370B setting DISPLAY Mode CAL OFF CAL OFF is initiated by pressing the STORE button while holding down the FAST SHIFT button 5 30 370B Service Manual Performance Verification C4 Checking Orthogonality and Geometry Examining Store Pos
33. 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 The following contains a brief description of each manual section Specifications contains a description of the 370B Programmable Curve Tracer and the characteristics that apply to it Operating Information includes general information and operating instructions Theory of Operation contains circuit descriptions that support service to the module level Performance Verification contains procedures for confirming that the 370B Programmable Curve Tracer functions properly and meets warranted limits Adjustment Procedures contains a collection of procedures for adjusting the 370B Programmable Curve Tracer to meet warranted limits Maintenance contains information and procedures for performing preventive and corrective maintenance of the 370B Programmable Curve Tracer These instructions include cleaning module removal and installation and fault isolation to the module Options contains information on servicing factory installed options Electrical Parts List contains a statement referring you to Mechanical Parts List where both electrical and mechanical modules are listed Diagrams contains an block diagram and an interconnection diagram Mechanical Parts List includes a table of all replaceable modules their descriptions and their Te
34. Step Generator max voltage output in 2 V step 0 01 A 40 V 40 V G gt 3 02 15 Q lt 8 0 5 A 10 V Q 10V 10 mA 02 05 370B Service Manual Load Current 1 9 Specifications Table 1 3 AUX Supply Characteristic Range Accuracy Output current Ripple pulse noise Performance Requirement From 40 to 40 volts with 20 mV step resolution Within 50 mV 1 5 of total output At least 100 mA at 20 V At least 10 mA at 40 V 3 Less than 50 mMVp p 3 Max voltage output and current of AUX SUPPLY Aiddns xny A 40V 20V 0 01 A 40 V 0 1A 20V 0v 10 mA 100 mA Load Current Table 1 4 Non store Vertical Deflection System Characteristic Cursor Accuracy typical Collector Base Current Range Accuracy typical Performance Requirement Within 0 06 division 1 uA div to 2 A div a 1 2 5 sequence x10 MAG extends maximum sensitivity to 100 nA div 1 nA resolution Within 296 of WINDOW cursor readout 0 1 x VERT DIV setting Operating Information Operating Information 370B Service Manual Specifications Table 1 4 Non store Vertical Deflection System Cont Characteristic Maximum displayed noise or ripple Max Volts Range Noise or Ripple Emitter current Range Accuracy Maximum displayed noise or ripple Max Volts Range Noise or Ripple Step generator display Rang
35. V 7 Check that the digital multimeter reading is between 40 66 V and 39 34 V Removing the Setup 8 Change the following 370B setting LEFT RIGHT STANDBY STANDBY 370B Service Manual Performance Verification F10 Checking Maximum Current Output in CURRENT Mode 370B Service Manual 9 Remove the Digital Multimeter NOTE If step 10 will not be performed complete the instructions given under Replacing the Store Non Store Jumper at the end of Step F10 before proceeding to another step or ending the procedure Specification Absolute Accuracy is less than 1 5 of the total output 3 of the STEP AMPLITUDE setting 1 nA m Maximum current output is 20 times the STEP AMPLITUDE setting except at 200 mA where it is 10 times the setting NOTE If the previous step was not performed complete the instructions given under Moving the Store Non Store Jumper at the beginning of Step F8 before proceeding with this step Digital Multimeter To Left Base 370B settings Initialize the 370B then set the following controls as indicated DISPLAY Mode NON STORE VERTICAL CURRENT STEP GEN 5 93 Performance Verification 5 94 COLLECTOR SUPPLY POLARITY STEP GENERATOR Mode STEP AMPLITUDE NUMBER OF STEPS OFFSET POSITION LEFT RIGHT STANDBY OUTPUTS Protective Cover Test Equipment Settings Digital Multimeter Mode DC CURRENT 100 mA 10 1000 mA DISPLAY L
36. X 0 312 FLH STL 0435 ORDER BY DESC 16 210 0457 XX 1 NUT PLASSEM WA 6 32 X 0 312 STL TK0435 ORDER BY DESC END ATTACHING PARTS 17 344 0395 XX 1 CLIP CABLE NYLON 80009 3440395 18 348 0949 XX 1 GROMMET PLASTIC BLACK RING 15MM ID 80009 3480949 19 255 0334 XX 1 PLASTIC CHANNEL 12 75 X 0 175 X 0 155 NYLON 11897 122 NN 2500 060 20 407 3486 XX 2 BRACKET XFMR ALUMINUM 80009 4073486 ATTACHING PARTS 21 220 0410 XX 6 NUT PLASSEM WA 10 32 X 0 375 HEX STL 0 01 511 101200 50 0 END ATTACHING PARTS 22 120 1677 01 1 XFMR PWR STU CLCT SUPPLY 70V IN 40 66HZ T200 80009 120167701 ATTACHING PARTS 23 212 0507 XX 4 SCREW MACHINE 10 32 X 0 375 PNH STL 0435 ORDER BY DESC END ATTACHING PARTS 24 407 3854 XX 1 BRACKET ANGLE ALUMINUM SUPPORT 80009 4073854 ATTACHING PARTS 25 211 0538 XX 4 SCREW MACHINE 6 32 X 0 312 FLH 100 DEG STL 0435 ORDER BY DESC END ATTACHING PARTS 26 198 5713 00 1 WIRE SET ELEC 370B W D SUB CONN W491 80009 198571300 ATTACHING PARTS 27 211 0661 XX 2 SCR ASSEM WSHR 4 40 X 0 25 PNH STL TK0435 ORDER BY DESC END ATTACHING PARTS 28 386 5917 XX 1 PLATE CONN MTG STEEL 80009 3865917XX ATTACHING PARTS 370B Service Manual 9 31 Mechanical Parts List Replaceable mechanical parts list Cont Fig amp index number 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 45 46 47 48 49 50 51 54 55 56 9 32 Tektronix part number
37. X10 MAG 10 steps division With STEP MULTI 1 x Within 0 3 division 10 divisions in 0 1 division resolution Within 1 5 of DOT cursor readout 0 01 x HORIZ DIV setting Within 1 5 of DOT cursor readout 0 3 x HORIZ DIV setting Within 0 04 x HORIZ DIV setting 370B Service Manual Specifications Table 1 8 CRT and Readout Characteristic CRT Type Phosphor Acceleration potential Screen size Total addressable points graticule area Geometry Resolution Spot size Orthogonality Trace rotation range typical READOUT VERT DIV HORIZ DIV PER STEP OFFSET P or gm DIV CURSOR of COLLECTOR PEAK VOLTS Aux Supply 370B Service Manual Performance Requirement Operating Information s Electrostatic deflection D 178mm 7 in diagonal internal graticule and on screen scale factor readout 0 5 minor division or less of tilt or bowing 0 75 minor division or less of keystone At least 10 lines div Within 0 95 mm at screen center elsewhere on screen within twice center value 90 within 0 3 At least 3 Automatic on screen display Over range shown by a flashing display 100 pAto2A 5 mV to 500 V 5 nA to 200 mA and 5 mV to 2 V 500 x 107 to 400 x 106 for and 50 x 1079 S to 400 S for gm 4 digit Horizontal and Vertical values without x 10 MAG 5 digit with MAG 40 00 V to 40 00 V Specifications Table 1 9 Adapter Connectors Characteristic
38. adjusted through the access hole in the high voltage shield 3 ADJUST Grid Bias adjustment R210 on the A20 HV Regulator Board until the CRT spot is barely visible Examining t Astigmatism Adjusting Astig A18 R420 NOTE The characteristics examined in this step are provided as examples of typical instrument operation to aid in the adjustment of R420 they are not specifications 370B settings POWER OFF FOCUS Fully counterclockwise 1 While pressing the FAST SHIFT button set the 370B POWER switch to ON This displays the Frame Test Pattern on the CRT 5 20 370B Service Manual Performance Verification 370B Service Manual Examining Astigmatism 2 Change the following 370B settings INTENSITY NON STORE STORE VIEW Largest possible displayed center spot READOUT Cursor Fully counterclockwise 3 EXAMINE the center spot for a circular shape If the center spot is not circular the following adjustment may be necessary Adjusting Astigmatism 4 ADJUST ASTIG adjustment R420 on the 18 CRT Output Board for a circular spot shape 5 Change the following 370B settings FOCUS Clockwise for smallest possible spot INTENSITY NON STORE STORE VIEW Normal Viewing READOUT Cursor Normal Viewing 6 EXAMINE the CRT for the Frame Test Pattern to be similarly in focused If the Frame Test Pattern is not similarly focusing the following adjustment may be necessary 7 READJUST ASTIG adjustment R
39. by read write operation If a read write error is found such as bus shorted the memory index display blinks with 0 and 3 and the 370A does not advance the diagnostics routine m Acquisition RAM Check The 370B checks the Acquisition RAM by a read write operation If a read write error is found such as bus shorted the memory index display blinks with 0 and 4 and the 370B does not advance the diagnostics routine Table 4 1 shows the Power on System Error Messages displayed on the memory index display m Acquisition RAM Check The 370B checks the Flash ROM by checksum When a Flash ROM fatal error is founded such as bus shorted the memory index display alternately blinks 0 and 5 and the 370B does not advance to the next routine Table 4 1 Power on System Error Messages Display 0 1 blink 0 2 blink 0 3 blink Description System ROM error e g misinsertion System RAM error e g bus shorted Display RAM Read Write error 0 bus shorted 370B Service Manual Maintenance 370B Service Manual Table 4 1 Power on System Error Messages Cont Display 0 4 blink 0 5 blink Description Acquisition RAM Read Write error e g bus shorted Flash ROM error e g bus shorted LED Check The 370B turns on all front panel LEDs sequentially for visual check m Display Quality Check The 370B displays the Logo mark and a CRT adjustment pattern on the CRT for CRT control
40. connectors from a board tag each one to prevent misconnection while reassembling 370B Service Manual Maintenance 3 Remove the connectors for J64 J72 J190 J192 J194 J196 J198 J280 and J290 from the board 4 Remove the three screws that secure the heat sink of the A19 L V Supply circuit board to the chassis 5 Remove 19 L V Supply circuit board by removing its three securing screws from the rear edge of the board 6 Replace the A19 L V Supply circuit board in the reverse order of removal A20 H V Regulator Circuit Board Remove and replace the A20 H V Regulator circuit board as follows 1 Remove the left cabinet panel from the main body 2 Remove the shield covering the A20 H V Regulator circuit board from the main body by removing the four securing screws 3 Remove the retainer that holds the transistor on the board to the chassis by removing its screw anode cap is completely grounded to the chassis before handling the circuit WARNING The CRT anode circuit retains up to 2400 Volt of charge Be sure the board 4 Remove the CRT anode cap from the jack on the left side of the CRT Ground the CRT anode cap to the chassis to dispel any stored charge 5 Remove the connectors for J182 J194 and J200 from the board 6 Remove the A20 H V Regulator circuit board by removing the four screws from the corners of the board 7 Replace the A20 H V Regulator circuit board in the reve
41. effective Serial no discont d Qty Name amp description 1 1 COVER BEZEL POLYCARBONATE TEK TAN BEZEL CRT PC TEK TAN ATTACHING PARTS SCREW MACHINE 6 32 X 0 312 FLH STL END ATTACHING PARTS FILTER LT CRT BLUE 108 4MM X 134 4MM X 1MM SPACER RING CRT 0 4MM SHIELD CRT CLEAR FRAME CRT ATTACHING PARTS SCREW MACHINE 6 32 X 0 5 FLH STL END ATTACHING PARTS RETAINER CRT FRONT ATTACHING PARTS SCREW MACHINE 8 32 X 1 5 PNH STL END ATTACHING PARTS RETAINER CRT FRONT B ATTACHING PARTS SCREW MACHINE 8 32 X 1 5 PNH STL END ATTACHING PARTS MASK CRT ASSY SP ELEC 2 26AWG 30 0 L RIBBON W280 ASSY SP ELEC 2 26AWG 22 0 L RIBBON W290 BOARD ASSY LAMP A28 amp A29 ATTACHING PARTS SCREW MACHINE 2 56 X 0 312 PNH STL END ATTACHING PARTS RETAINER LIGHT REFLECTOR REFLECTOR LIGHT INT SCALE ILLUMINATION SPRING RTNR SCALE LAMP ELECTRON TUBE V100 TAPE PRESS SENS 0 08 X 20 X 20000MM AL FOIL TAPE SILICONE RED RBR 1 25 X 0 02 FRAME FRONT ATTACHING PARTS SCREW MACHINE 6 32 X 0 312 FLH STL SCREW MACHINE 6 32 X 0 25 FLH STL END ATTACHING PARTS CONTACT SPRING GROUNDING CRT ATTACHING PARTS SCR ASSEM WSHR 4 40 X 0 25 PNH STL END ATTACHING PARTS Mfr code 80009 80009 0435 80009 80009 80009 80009 0435 80009 0435 80009 0435 80009 80009 80009 0435 80009 0JR05 80009 80009 99742 80009
42. glass fragments implosion Wear protective clothing and safety glasses Avoid striking the CRT on any object that might cause it to crack or implode When storing a CRT place it in a protective carton or face down in a protected location on a smooth surface with a soft mat under the face plate 1 Remove the rear panel and the top cabinet panel 2 Loosen the two screws located on both sides of the CRT base pin until the tension of the springs on these screws is released 3 Remove the CRT base pin socket from the rear of the CRT 4 Disconnect the CRT anode cap from the jack located on the left side of the CRT Ground the CRT anode to the chassis to dissipate any stored charge remaining in the CRT 5 Remove the CRT bezel cover from the lower side of the CRT bezel by pulling it off with your finger nail Remove the CRT bezel from the front panel by removing the two screws located on the lower side of the bezel 6 Remove the CRT filter CRT spacer and CRT implosion shield from the CRT frame 7 Remove the four screws located on the inner sides of the frame 8 Remove the CRT frame by removing the four remaining screws located on the outer sides of the CRT frame Remove the cushion from the CRT face plate 9 Remove the graticule illumination lamp assembly from both sides of the CRT 10 Hold one hand on the CRT face plate and gently pull out the CRT while pushing on the CRT base pins 4 7 Maintenance 4 8 Cath
43. level To isolate a failure to a module use the fault isolation procedures found in Troubleshooting part of section 6 Maintenance To remove and replace any failed module follow the instructions in Removal and Installation Procedures also part of section 6 After isolating a faulty module replace it with a fully tested module obtained from the factory Section 9 Mechanical Parts List contains part number and ordering information for all replaceable modules XV Introduction Tektronix Service Offerings Warranty Repair Service Self Service 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 are well trained to service the waveform generator They have access to the latest information on improvements to the 370B as well as new options Tektronix warrants this product for one year from date of purchase The warranty appears on the back of the title page in this manual Tektronix technicians provide warranty service at most Tektronix service locations The Tektronix product catalog lists all worldwide service locations or you can visit our Web site for service information www tektronix com Tektronix supports repair to the module level by providing Module Exchange Module Exchange This service reduces down time for rep
44. or improperly installed circuit boards and heat damaged parts The corrective procedure for most visible defects is obvious however particular care must be taken if heat damaged parts are found Overheating usually indicates other trouble in the instrument therefore correcting the cause of overheating is important to prevent recurrence of the damage 370B Service Manual Maintenance Semiconductor Checks Periodic Electrical Adjustment 370B Service Manual Periodic checks of the semiconductors are not recommended The best check of semiconductor performance is actual operation in the instrument More details on semiconductors are given under Troubleshooting later in this section To ensure accurate measurements check the electrical adjustment of this instrument after each 2000 hours of operation or annually if used infrequently In addition replacement of components may necessitate adjustment of the affected circuits Complete adjustment instructions are given in Section XXFour Performance Check and Adjustment This procedure can be helpful in localizing certain troubles in the instrument and in some cases may correct them 4 3 Maintenance Corrective Maintenance Component Removal and Replacement A 4 4 Corrective maintenance consists of instrument repair Special techniques required to replace boards in the 370B Programmable Curve Tracer are given here WARNING To avoid electric shock hazard always
45. spot will move in the opposite direction NOTE If steps F7 F8 F9 and F10 will not be performed complete the instructions given under Replacing the Store Non Store Jumper at the end of Step F13 before proceeding to another step or ending the procedure 370B Service Manual Performance Verification F7 Checking Step Multi 1X Accuracy in VOLTAGE Mode 370B Service Manual Specification m Incremental accuracy is 1 5 NOTE If the previous step was not performed complete the instructions given under Moving the Store Non Store Jumper at the beginning of Step F8 before proceed ing with this step Digital Multimeter To Left Base 370B settings Initialize the 370B then set the following controls as indicated DISPLAY Mode NON STORE HORIZONTAL VOLTS 2 V BASE EMITTER COLLECTOR SUPPLY DC POLARITY STEP GENERATOR Mode VOLTAGE STEP AMPLITUDE 2V NUMBER OF STEPS 10 POSITION DISPLAY LEFT RIGHT STANDBY LEFT OUTPUTS ENABLED Protective Cover Closed Test Equipment Settings 5 87 Performance Verification 5 88 Digital Multimeter Mode DC Voltage press the up and right Position Control buttons to move the displayed spot to the graticule center V 5 0 H 5 0 Checking Step 0 and 1 1 Change the following 370B settings STEP GENERATOR STEP MULTI 1X On MAG X10 On 2 Record the value of the digital multimeter reading 3 Change the following 370B setting MEASUREMENT Pre
46. to connect the STEP GEN OUT and EXT BASE or EMITTER IN jacks and close the protective cover 5 125 Performance Verification 5 126 11 EXAMINE the test oscilloscope for a step waveform to be displayed Checking Base SHORT EMITTER Configuration 12 Disconnect the patch cord and connect the test oscilloscope between the STEP GEN OUT and ground jacks 13 Change the following 370B and Test Equipment settings 370B CONFIGURATION BASE SHORT EMITTER Protective Cover Closed Test Equipment Settings Mode Q 14 EXAMINE the test oscilloscope does not display a step waveform 15 Disconnect the Test Oscilloscope and connect the Digital Multimeter to the RIGHT B BASE and E EMITTER jacks 16 EXAMINE that the RIGHT B and E are shorted Resistance is approximately 1 Q or less 17 Change the following 370B setting LEFT RIGHT STANDBY LEFT 18 Connect the Digital Multimeter to the LEFT B BASE and E EMITTER jacks 19 EXAMINE that the LEFT B and E are shorted Resistance is approximately 1 Q or less Checking Base COLLECTOR SUPPLY CONFIGURATION 20 Disconnect the Digital Multimeter 21 Change the following 370B and Test Equipment settings 370B CONFIGURATION BASE COLLECTOR SUP PLY OUTPUT ENABLED 370B Service Manual Performance Verification Examining Emitter Configuration 370B Service Manual Test Oscilloscope Vertical Sensitivity 5 DC Horizontal 2 ms div Trigger
47. top 4 Fasten a foot at each corner on the bottom of the instrument Getting Started Cabinet to Rackmount To convert the 370B cabinet model to a rackmount version use the following Conversion procedure see Figure 2 7 PLASTIC RETAINER BRACKET 8 32 PNH SCREW lt SPACER BAR CABINET VERSION SIDE PANEL 10 22 Pd p VERSION OVAL HEAD SIDE PANEL SCREW Figure 2 7 Cabinet to Rackmount Conversion Remove the bracket from each comer on the rear panel Replace the side panels with rackmount version side panels Attach brackets at each comer on the rear panel qe c Remove both carrying handle assemblies a Remove the plastic retainer caps that conceal the screws located at each end of the handle b Remove the screw spacer and bar nut then lift off the carrying handle assembly 370B Service Manual Getting Started Repacking for shipment 370B Service Manual If this instrument is to be shipped long distances we recommend that the instrument be repackaged the same as when it arrived The cartons and packag ing material in which your instrument was shipped should be saved and used for this purpose If your instrument is to be shipped to a Tektronix Service Center for service or repair attach a tag to the instrument showing the following Owner of the instrument with address Name of a person at your firm to contact Instrument type Instrument serial number Descripti
48. two assemblies one for each side of the instru ment Each assembly consists of three sections see Figure 2 5 The stationary section of each track attaches to rack rails as shown in Figure 2 6 The chassis section mounts on the instrument and is installed at the factory The intermediate section fits between the other two sections allowing the instrument to be fully extended out of the rack 10 32 PHS SCREWS oN STATIONARY Z SECTION a 2 AUTOMATIC 2 LATCHES Z HOLE INTERMEDIATE REAR SECTION er MOUNTING BRACKET 10 32 PHS STOP LATCH SCREWS HOLES FLAT ENGAGES WITH RACK RELEASE LATCH NUTS MOUNTING HARDWARE SUPPLIED WITH THE SLIDES Figure 2 5 Rackmounting Hardware 370B Service Manual 2 9 Getting Started The stationary and intermediate sections for both sides are shipped as a matched set and should not be separated The package includes matched sets for both sides and mounting hardware To identify the assemblies note that the automatic latch and intermediate section latch stop holes are located near the top when the matched sets are properly mated to the chassis sections To mount the instrument in a rack perform the following 1 Select the appropriate holes in the rack rail using Figure 2 3 as a guide 2 Mount the stationary track sections to the front rack rails with truss head screws and bar nuts if necessary 3 Mount the stationary track sections to the rear ra
49. voltage source To verify that the power input fuse is for the nominal AC source voltage selected perform the following 1 Use the small straight slot screwdriver to pry the cap with the attached fuse inside out of the fuse holder 2 Verify proper fuse value Nominal voltage 230 V 2 A medium blow Nominal voltage 115 V 4 A medium blow 3 Install the proper fuse and reinstall the fuse holder cap A power cord with the appropriate plug configuration is supplied with each instrument The color coding of the power cord conductors appears in Table 2 2 Also should you require a power cord plug other than that supplied refer to Table 2 3 Power Cord Identification Table 2 2 Power Cord Color Conductor Identification Conductor Alternate Ungrounded Line Brown Black Grounded Neutral Light Blue White Grounded Protective Ground Green Yellow Green Yellow 370B Service Manual Getting Started 370B Service Manual Table 2 3 Power cord identification Plug configuration Option number North America Standard 125 V Europe 1 220 V United Kingdom 240 V Australia 240 V Switzerland 220 V China AC 240 V No power cord supplied A9 2 3 Getting Started 2 4 A Operating Temperature A WARNING This instrument operates from a single phase power source and has a detachable three wire power cord with a two pole three terminal grounding type plug The voltage to groun
50. 0 Removing the Setup 5 Change the following 370B settings COLLECTOR SUPPLY MAX PEAK VOLTS 16V LEFT RIGHT STANDBY STANDBY 6 Remove the patch cord from the 370B Table 5 17 Maximum Peak Currents MAX PEAK VOLTS VERTICAL settings WATTS RENT DIV setting CURSOR Readout 370B Service Manual 5 111 Performance Verification 5 112 G5 Examining the Interlock system and POLARITY Settings NOTE The characteristics examined in this step are examples of typical instrument operation they are not specifications 370B settings Initialize the 370B then set the following controls as indicated DISPLAY Mode NON STORE OUTPUTS ENABLED LEFT RIGHT STANDBY LEFT Protective Cover Closed Examining Collector Supply Variable Operation and C POLARITY 1 EXAMINE the display as the VARIABLE COLLECTOR SUPPLY control is rotated clockwise for the trace to become a horizontal line starting in the lower left corner and extending continuously to right along the bottom horizontal graticule Examining Interlock system and Warning LED 2 EXAMINE that the red LED beside the WARNING lettering is lit 3 Open the Protective Cover 4 EXAMINE that the red LED display turns off and that the displayed trace is go back to lower left corner Examining OUTPUTS Operation 5 Close the Protective Cover 370B Service Manual Performance Verification 370B Service Manual 6 EXAMINE the displayed spot extends toward
51. 0 5402 5100 on A14LOR KEY BOARD and inter lock relay K700 on A10 SENSE BOARD Signal at A9 J97 is OK NO YES Check A34 L O R RELAY BOARD Signal at J1on U300 INPUT RELAY MODULE is OK NO YES Check U800 HV RELAY MODULE 370B Service Manual Set POWER switch to OFF pull out DRAWER UNIT remove thelid of GUARD YES BOX set LEFT RIGHT Check COLLECTOR SUPPLY signal 100Vp p 2 COLLECTOR SUPPLY SIGNAL is OK sine wave at Pin 1 of J104 A10 SENSE BOARD STANDBY switch to LEFT and turnVARIABLE COLLECTOR SUPPLY to 100 NO Check A10 SENSE BOARD and J490 D SUB CONNECTOR Check Check A9 L V RELAY BOARD for 1 32Vp p sine wave between Pin 1 and 2 of J95 All Voltage 2 160Vp p sine wave between are OK Pin 1 and 2 of J94 3 900Vp p sine wave between Pin 1 and 2 of J94 gt Check A9 L V RELAY BOARD Check T200 COLLECTOR SUPPLY TRANS 4 4kVp p sine wave appears between J1 J2 of U800 4 Voltages are OK Check 12VH and 12VDG on RELAY BOARD NO Check T200 COLLECTOR Check A10 SENSE BOARD SUPPLY TRANS 2 Check full waverestified Full wave positive sine wave 2000V rectified YES appears at J91 on A34 LOR positive sine RELAY BOARD when MAX PEAK VOLTS is set to 2000 NO Check full waverectified positive sine wave 16V appears at J97 on A9 L V RELAY BOARD Check that th
52. 0 0608 3038 402 3431286XX 3038 402 1360887XX 1360888XX ORDER BY DESC 198569600 198568000 198568300 198570000 198568101 198568200 198567900 HW 047 4073889XX ORDER BY DESC 4073484XX 9 23 Mechanical Parts List Replaceable mechanical parts list Cont Fig amp index Tektronix part Serialno Serial no Mfr number number effective discontd Qty amp description code Mfr part number 56 211 0038 XX 4 SCREW MACHINE 4 40 X 0 312 FLH STL TK0435 ORDER BY DESC END ATTACHING PARTS 57 260 2324 00 2 SWITCH SENS 5400 5402 80009 260232400 ATTACHING PARTS 58 213 0986 XX 4 SCREW MACHINE 2 26 X 12MM HEX BRS 80009 2130986 59 210 0938 XX 4 WASHER FLAT 0 109 ID X 0 25 OD X 0 032 STL TK0413 ORDER BY DESC 60 210 0054 XX 4 WASHER LOCK 4 SPLIT 0 025 THK STL 86928 ORDER BY DESC END ATTACHING PARTS 61 198 5685 00 1 WIRE SET ELEC W401 80009 198568500 62 196 3270 00 1 LEAD ELECTRICAL 26 AWG 28 0 L N 0 W402 80009 196327000 63 343 0549 XX 3 STRAP TIEDOWN E 0 098 W X 4 0 LZYTEL 1499 HW 047 64 344 0395 XX 1 CLIP CABLE NYLON 80009 3440395 65 344 0396 XX 2 CLIP CABLE PVC 80009 3440396 66 333 A440 00 1 PANEL FRONT 80009 333444000 The panel which a character isn t being printed on 67 407 3472 XX 1 BRACKET ANGLE LOWER PANEL 80009 4073472 ATTACHING PARTS 68 210 0586 XX 2 NUT PL ASSEM WA 4 40 X 0 25 STL TK0435 ORDER BY DESC 69 211 0038 XX 2 SCREW MACHINE 4 40 X 0 312 F
53. 05 CIRCUIT BD ASSY DISPLAY CONTROL 80009 670930705 A6 670 9308 06 CIRCUIT BD ASSY COLLECTOR SUPPLY 80009 670930806 A7 670 9309 09 CIRCUIT BD ASSY STEP GENERATOR 80009 670930909 A9 671 1183 04 CIRCUIT BD ASSY LV RELAY 80009 671118304 A10 671 B212 00 CIRCUIT BD ASSY SENSE BOARD 80009 671821200 11 671 235 00 CIRCUIT BD ASSY MAIN KEY 80009 671823500 12 671 1149 02 CIRCUIT BD ASSY SUB KEY 80009 671114902 A13 671 1238 02 CIRCUIT BD ASSY KEY INTERFACE 80009 671123802 A14 671 B244 00 CIRCUIT BD ASSY LOR KEY 80009 671824400 A15 671 B245 00 CIRCUIT BD ASSY CONFIGURATION LED 80009 671 24500 A18 670 9319 02 CIRCUIT BD ASSY CRT OUTPUT 80009 670931902 A19 670 9320 01 CIRCUIT BD ASSY LV SUPPLY 80009 670932001 A20 670 B211 00 CIRCUIT BD ASSY H V REGULATOR 0191 670821100 A22 671 B127 01 CIRCUIT BD ASSY INTERFACE 80009 671 12701 A23 671 B128 01 CIRCUIT BD ASSY FDD INTERFACE 80009 671 12801 A24 119 B105 00 FLOPPY DISK UNI 3 5 INCH W INTERFACE 80009 119810500 STANDARD ACCESSORY A27 670 9323 00 CIRCUIT BD ASSY PRIMARY 80009 670932300 A28 670 9324 02 CIRCUIT BD ASSY LAMP 80009 670932401 A29 670 9324 02 CIRCUIT BD ASSY LAMP 80009 670932402 A33 671 1096 03 CIRCUIT BD ASSY CONFIGURATION RELAY 80009 671109603 A34 671 1140 01 CIRCUIT BD ASSY LOR RELAY 80009 671114001 A35 671 1147 03 CIRCUIT BD ASSY LOOPING 80009 671114703 7 4 370B Service Manual Electrical Parts List Replaceable electrical parts list Cont Component number 1 60 A1W70
54. 0B F12 Checking Maximum i cas RENE da Specification m Maximum Opposing Volts in Current Mode is less than 15 volts 370B settings Initialize the 370B then set the following controls as indicated DISPLAY HORIZONTAL VOLTS DIV 2 V BASE EMITTER COLLECTOR SUPPLY AC POLARITY STEP GENERATOR Mode CURRENT STEP AMPLITUDE 200 mA NUMBER OF STEPS 0 OFFSET 2000 mA CURSOR DOT OUTPUTS ENABLED Protective Cover Closed Checking Maximum Opposing Volts without INVERT 1 Setthe LEFT RIGHT STANDBY switch to LEFT 2 CHECK that the horizontal CURSOR readout is no more than 15 V 370B Service Manual 5 99 Performance Verification F13 Checking PULSE Width 5 100 Checking Maximum Opposing Volts with INVERT 3 Change the following 370B setting STEP GENERATOR On POLARITY INVERT The indicator beside the INVERT button will light 4 CHECK that the horizontal CURSOR readout is no more than 15 V Specification m Pulse Width is 80 us 10 for the SHORT setting of the PULSE selector and 300 us 10 for the LONG setting at half amplitude Test Oscilloscope ertical Input 9 Qj To STEP GEN OUT To 370B Ground Jack 370B settings Initialize the 370B then set the following control as indicated STEP GENERATOR Mode VOLTAGE STEP AMPLITUDE 2V NUMBER OF STEPS 1 PULSE LONG OUTPUTS ENABLED Protective Cover Closed Test Equipment settings 370B Service Manual Performance Verifi
55. 0XX 129112600 3780278XX 2003277XX ORDER BY DESC 3431271XX ORDER BY DESC 119231001 ORDER BY DESC 161025701 129A59000 3610704XX 3420894XX 671B12700 211087100 671B12701 174029500 3420782XX 9 7 Mechanical Parts List Replaceable mechanical parts list Cont Fig amp index Tektronix part Serialno Serial no Mfr number number effective discontd Qty amp description code Mfr part number 78 670 9323 00 1 BOARD ASSY PRIMARY A27 80009 670932300 ATTACHING PARTS 79 211 0661 XX 4 SCR ASSEM WSHR 4 40 X 0 25 PNH STL TK0435 ORDER BY DESC END ATTACHING PARTS CKT BOARD ASSY INCLUDES 80 131 3666 00 1 CONN RCPT ELEC CKT BD 2 PIN A27J272 80009 131366600 81 131 3669 00 1 CONN RCPT ELEC CKT BD 6 PIN A27J274 80009 131366900 82 131 3667 00 1 CONN RCPT ELEC CKT BD 3 PIN A27J270 80009 131366700 83 119 3603 00 1 FILTER RFI 115 230V 4A FL100 80009 119360300 ATTACHING PARTS 84 211 0537 XX 2 SCREW MACHINE 6 32 X 0 375 TRH STL TK0435 ORDER BY DESC 85 210 0407 XX 2 NUT PLAIN HEX 6 32 X 0 25 BRS 73743 3038 402 86 210 0006 XX 2 WASHER LOCK 6 INTL 0 018 THK STL 78189 1206 00 00 0541 END ATTACHING PARTS 87 196 3112 01 1 LEAD ELECTRICAL 18 AWG 6 0 L 5 4 W17 80009 196311201 88 210 0202 XX 1 TERMINAL LUG 0 146 ID LOCKING BRZ 1181 ORDER BY DESC ATTACHING PARTS 89 211 0565 XX 1 SCREW MACHINE 6 32 X 0 250 TRH STL TK0435 ORDER BY DESC END ATTACHING PARTS 90 196 3098 01 1 LEA
56. 1 192 A6W64 A6W66 A9W90 A11W110 A14W140 A15W150 A15W150 A22W220 A23W100 A23W200 A33W330 Tektronix part number 174 0291 00 174 0292 00 174 0294 00 174 0301 00 174 0304 00 174 1774 00 174 0293 00 174 1832 00 174 1775 00 174 1775 01 174 0295 00 174 1692 00 174 1611 00 174 1951 00 370B Service Manual Serial no effective 301393 301498 Serial no discont d 301497 Name amp description CA ASSY SPELEC 16 28 AWG 18 5 L RIBBON CA ASSY SPELEC 16 28 AWG 4 3 L RIBBON CA ASSY SBELEC 16 28 AWG 12 6 L RIBBON CA ASSY SP ELEC 4 22 AWG 16 0 L CA ASSY SP ELEC 2 26 AWG 6 0 L RIBBON CA ASSY SBELEC 40 26 AWG 8 0 L RIBBON CA ASSY SBELEC 40 28 AWG 4 3 L RIBBON CA ASSY SBELEC 14 28 AWG 23 0 L RIBBON CA ASSY SBELEC 16 26 AWG 18 0 L RIBBON CA ASSY SBELEC 16 28 AWG 250MM L RIBBON CA ASSY SBELEC 26 28 AWG 11 0 L RIBBON CA ASSY SBELEC 24 28 AWG 12 0 L RIBBON CA ASSY SPELEC 34 28 AWG 9 0 L RIBBON CA ASSY SBELEC 14 28 AWG 11 0 L RIBBON Mfr code 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 Mfr part number 174029100 174029200 174029400 174030100 174030400 174177400 174029300 174183200 174177500 174177501 174029500 174169200 174161100 174195100 7 5 Electrical Parts List Replaceable electrical parts list Cont Component number 100 100 F100 F100 W3 WA W1
57. 15 Max Peak Volts PEAK VOLTS HORIZONTAL MAX PEAK POWER Horizontal CURSOR VOLTS DIV setting WATTS setting Readout Limits setting 2000 500 V 2000 V to 2300 V G3 Checking DC Mode Ripple m DC Mode Ripple tor 2 of the full range voltage 370B settings Initialize the 370B then set the following control as indicated DISPLAY Mode NON STORE COLLECTOR SUPPLY MAX PEAK POWER 220 WATTS POLARITY DC POSITION DISPLAY OUTPUTS ENABLED VARIABLE COLLECTOR 100 SUPPLY Protective Cover Closed Checking 16 MAX PEAK VOLTS DC Mode Ripple 5 108 370B Service Manual Performance Verification 1 Move the spot to graticule center with the Position Control buttons 2 Change the following 370B setting MAG X10 On 3 CHECK the display spot for its width to be within the limit given in Table 5 16 for 16 MAX PEAK VOLTS Checking 2000 MAX PEAK VOLTS DC Mode Ripple 4 Change the following 370B settings DISPLAY HORIZONTAL VOLTS DIV 50 V COLLECTOR COLLECTOR SUPPLY MAX PEAK VOLTS 2000 VARIABLE 100 COLLECTORSUPPLY 5 Move the spot to graticule center with the right Position Control button 6 CHECK the display spot for its width to be with the limit given in Table 5 16 for 2000 MAX PEAK VOLTS MAX PEAK POWER WATTS should be automatically change to 50 when the MAX PEAK VOLTS setting is changed from 16 to 2000 Table 5 16 Max Peak Volts PEAK VOLTS HORIZONTAL MAX PEAK POWER Max
58. 211 0510 XX 174 1693 00 211 0661 XX 386 5484 XX 211 0510 XX 119 B105 00 211 0751 XX 337 3588 XX 211 0658 XX 407 3855 XX 211 0538 XX 211 0507 XX 334 6696 XX 671 B128 01 211 0661 XX 174 1611 00 174 B903 00 119 3477 02 211 0244 XX 337 3629 XX 671 1238 02 211 0661 XX 671 B212 00 211 0661 XX 129 0713 XX Serial no effective Serial no discont d Qty Name amp description 2 SCREW MACHINE 6 32 X 0 375 PNH STL END ATTACHING PARTS CA ASSY SP ELEC 34 28 AWG 130 0 L RIBBON W142 ATTACHING PARTS SCR ASSEM WSHR 4 40 X 0 25 PNH STL END ATTACHING PARTS PLATE CONN MTG MALE STEEL ATTACHING PARTS SCREW MACHINE 6 32 X 0 375 PNH STL END ATTACHING PARTS FLOPPY DISK DRIVE A24 STAND ACC ATTACHING PARTS SCR ASSEM WSHR M3 X 8 END ATTACHING PARTS SHIELD ELEC ALUMINUM ATTACHING PARTS SCR ASSEM WSHR 6 32 X 0 312 PNH STL P0Z END ATTACHING PARTS BRKT TEST FXTR ALUMINUM FDD MTG ATTACHING PARTS SCREW MACHINE 6 32 X 0 312 FLH STL SCREW MACHINE 6 32 X 0 312 PNH STL END ATTACHING PARTS MARKER IDENT MKD DANGER CKT BOARD ASSY FDD INTERFACE A23 ATTACHING PARTS SCR ASSEM WSHR 4 40 X 0 25 PNH STL END ATTACHING PARTS CKT BOARD ASSY INCLUDES CA ASSY SP ELEC 34 28 AWG 9 0 L RIBBON A23W200 CA ASSY SP ELEC A23W100 RELAY MODULE W 8 RELAYS 0300 SHOULD BE CHANGED WITH A10C322 20 0300 ATTACHING PARTS SCR ASSEM WSHR 4 40 X 0 312 PNH STL END ATTA
59. 25 mV 370B MAG X10 Off POSITION Move the spot to the graticule center with the Position Control buttons 5 Change the following 370B setting MAG X10 On 6 Note the Horizontal CURSOR readout 7 Change the following Test equipment and 370B settings Calibrator Output 250 mV 370B MAG X10 Off POSITION Move the spot to the graticule center with the Position Control buttons 8 Change the following 370B setting MAG X10 On 370B Service Manual 5 65 Performance Verification 9 Note the Horizontal CURSOR readout 10 Change the following Test Equipment and 370B settings Calibrator Output Standby 370B MAG X10 Off COLLECTOR SUPPLY 16 MAX PEAK VOLTS PEAK POWER 220 WATTS POSITION Simultaneously press the up and down Position Control buttons then simultaneously press the left and right Position Control buttons 11 Disconnect the Calibrator 12 Connect the 0 025 Q resistor as shown in Figure 5 3 then close the Protective Cover 13 Change the following 370B setting VARIABLE COLLECTOR Clockwise until the Horizontal CURSOR SUPPLY readout to about 112 5 mV 14 Move the spot to the graticule center with the Position Control buttons 15 Change the following 370B setting MAG X10 On VARIABLE COLLECTOR Set so the Horizontal CURSOR readout SUPPLY is nearest that noted in part 3 Difference value should be within 0 5 mV 5 66 370B Service Manual Performance Verification To L
60. 3344 XX 337 851 00 650 4574 00 The parts numberd 33 to 65 except for 54 are assembled into this kit 370B Service Manual Qty Name amp description 2 NUT PL ASSEM WA 4 40 X 0 25 STL END ATTACHING PARTS CIRCUIT BREAKER SPST 1 5A 250 VAC S800 WIRE SET ELEC W410 SHIELD ELEC PROTECTIVE BOX PC SUB PANEL Printed matter TEST ADAPTER ASSY W CABLE Mfr code TK0435 80009 80009 80009 80009 80009 Mfr part number ORDER BY DESC 260249900 198546800 3373344XX 337485100 650457400 9 25 Mechanical Parts List 9 26 370B Service Manual Figure 9 5 Front Panel L O R 9 27 370B Service Manual Wwwowsss Wwe Figure 9 6 LV L O R Looping Circuit Boards 370B Service Manual 9 28 Mechanical Parts List Replaceable mechanical parts list Fig amp index Tektronix part Serialno Serial no Mfr number number effective discontd Qty amp description code Mfr part number 6 1 441 1923 1 CHAS TEST FXTR GUARD BOX COVER AL 80009 4411923XX ATTACHING PARTS 2 211 0661 XX 4 SCR ASSEM WSHR 4 40 X 0 25 PNH STL TK0435 ORDER BY DESC END ATTACHING PARTS 3 334 7730 XX 1 MARKER IDENT MKD LOOPING INFO 80009 3347730XX 4 334 6690 XX 1 MARKER DENT MKD CAUTION amp DANGER 80009 3346690 5 252 0719 XX 1 PLASTIC SH CHAN 0 047 X 0 063 THK 39 37 L 80009 2520719 6 671 1183 04 1 BOARD ASSY LV RELAY 9 80009 671118304 ATTACHING PARTS
61. 370B Block Diagram 3 3 Figure 5 1 Diagnostic test pattern display 5 32 Figure 5 2 Looping compensation display 5 40 Figure 5 3 Checking Collector high current range 5 67 Figure 5 4 Examining and Adjusting for Step Generator Offset 5 73 Figure 5 5 Adjusting for Current Amplifier Bias 5 75 Figure 5 6 Checking for Maximum OFFSET of 200 mA Range 5 83 Figure 5 7 Checking for Maximum Current Output of 100 mA 200 mA rang sig os ere rrr 9 5 96 Figure 5 8 Adjusting for Collector Supply Amplifier Offset 5 105 Figure 5 9 Examining for DC and LEAKAGE operation 5 113 Figure 8 1 370B circuit board locator 8 1 Figure 9 1 Cabinet 9 9 Figure 9 2 Display Front 9 10 Figure 9 3 Chassis Circuit Boards 9 17 Figure 9 4 Power Supply 9 18 Figure 9 5 Front Panel 9 27 Figure 9 6 LV L O R Looping Circuit Boards 9 28 Figure 9 7 FDD Config Relay Sense Circuit Boards 9 35 Figure 9 8 Accessories 9 36 Table of Contents List of Tables Table 1 1 Collector Supply 1 4 Table 1 2 Step Generato
62. 4 W16 W17 W18 W19 W66 W72 W91 W93 W95 W102 W103 W104 W104 W111 W142 W180 W182 W190 W194 W210 W270 W272 W272 W272 W280 W290 W400 W401 W402 W410 W490 W491 Tektronix part number 119 3674 00 119 2310 01 159 0259 00 159 0260 00 198 5683 00 198 5700 00 196 3099 00 196 3110 00 196 3112 01 196 3111 00 196 3098 01 174 0304 00 174 0310 00 198 5680 01 198 5696 00 198 5680 00 198 5679 00 198 5682 00 198 5681 00 198 5681 01 196 3096 00 174 1693 00 174 0314 00 174 0309 00 174 0328 00 174 0308 00 198 5686 00 174 0327 00 161 0255 01 198 5733 00 161 0257 01 174 0313 00 174 0312 00 174 0296 00 198 5685 00 196 3270 00 198 5468 00 198 5714 00 198 5713 00 Serial no effective 301393 302157 301393 301978 301393 301413 301578 Serial no discont d 32156 301977 301412 301577 302156 Name amp description FAN TUBEAXIAL 115 VAC 240MA 19W 2650 RPM FAN TUBEXIAL 115VAC 230MA 16W 2650RPM FUSE CARTRIDGE 4A 125V MEDIUM 115V ONLY FUSE CARTRIDGE 2A 250V MEDIUM 230V ONLY WIRE SET ELEC WIRE SET ELEC LEAD ELECTRICAL 24 AWG 10 0 L LEAD ELECTRICAL 18 AWG 7 0 L 8 9 LEAD ELECTRICAL 18 AWG 6 0 1 5 4 LEAD ELECTRICAL 18 AWG 7 0 L 8 9 LEAD ELECTRICAL 18 AWG 7 0L 5 4 CA ASSY SP ELEC 2 26 AWG 6 0 L RIBBON CA ASSY SP ELEC 10 22 AWG 1 8 0 L RIBBON WIRE SET ELEC WIRE SET ELEC WIRE SET ELEC WIRE SET ELEC
63. 420 on the 18 CRT Output Board for slightly compromise between the center dot and the outer frame Removing the Setup 8 Press the FAST SHIFT key to exit the Frame Test Pattern Performance Verification B4 Examining NON STORE STORE VIEW INTENSITY Operation NOTE The characteristics examined in this step are examples of typical instrument operation they are not specifications Disk Slot lt gt 370Bsettings mame Floppy Disk Initialize the 370B then set the following controls as indicated DISPLAY VERTICAL STEP GEN OUTPUTS ENABLED VARIABLE COLLECTOR 100 SUPPLY Protective Cover Closed INTENSITY NON STORE STORE VIEW Normal Viewing NOTE Be sure to use a formatted floppy disk to perform this procedure Entering waveform data Entering waveform data 1 Set the MEMORY number to 2 using the up MEMORY button 2 Press ENTER Examine the display for the ENTER COMPLETE message 370B Service Manual Performance Verification Examining NON STORE Intensity 3 Change the following 370B setting DISPLAY Mode NON STORE VARIABLE COLLECTOR about 50 SUPPLY 4 EXAMINE the CRT for a continuous increase in NON STORE waveform brightness as the NON STORE STORE VIEW INTENSITY control is turned from fully counterclockwise to fully clockwise Examining STORE Intensity 5 Change the following 370B setting DISPLAY Mode STORE 6 EXAMINE the CRT for a continuous increas
64. 6 370B Service Manual Performance Verification CRT B1 Examining the 2400 V Cathode Supply 370B Service Manual Equipment Required see Table 5 3 m Digital Multimeter m High Voltage Probe for Digital Multimeter W Pozidrive Screwdriver with 1 Point NOTE The characteristics examined in this procedure are provided as examples of typical instrument operation they are not specifications Digital Multimeter To 370B Ground Jack High Voltage Probe 370B settings Initialize 370B then set the following controls as indicated INTENSITY NON STORE STORE VIEW Full counterclockwise Test Equipment settings Digital Multimeter with High Voltage Probe Mode DC Voltage Performance Verification A Removing the High Voltage Shield WARNING To avoid electric shock hazard be certain the 370B POWER switch is set to OFF before removing or replacing the high voltage shield and connecting the Digital Multimeter to the 370B Be certain that the Digital Multimeter ground lead is connected to the 370B ground terminal 1 Change the following 370B setting POWER OFF 2 Use a 1 Pozidrive screwdriver to remove the high voltage shield from the left side of the 370B There are three shields on the left side remove the center shield Measuring the Cathode Voltage 3 Connect the ground lead of High Voltage Probe to chassis ground and the High Voltage Probe to TP400 on the A20 HV Regulator B
65. 60 R370 ATTACHING PARTS NUT PLAIN HEX 0 25 32 X 0 312 BRS WASHER LOCK 0 261 ID INTL 0 018 THK STL END ATTACHING PARTS TERMINAL LUG 0 26 ID LOCKING BRZ LEAD ELECTRICAL 18 AWG 3 5 L 5 4 A11W111 LEAD ELECTRICAL 18 AWG 3 5 L 5 4 A11W112 CA ASSY SP ELEC 40 28 AWG 4 3L RIBBON A11W110 TERMINAL LUG 0 12 ID LOCKING BRZ SCREW MACHINE 4 40 X 0 25 PNH STL BRACKET ANGLE FRONT PANEL MTG AL ATTACHING PARTS SCREW MACHINE 4 40 X 0 625 FLH STL END ATTACHING PARTS SUB PANEL Mfr code 80009 80009 80009 80009 80009 80009 TK0435 80009 80009 73743 78189 80009 80009 73743 78189 0 01 80009 80009 80009 1741 0435 80009 0435 80009 Mfr part number 1291131XX 1291128XX 1313677XX 260215600 3660617XX 671B23500 ORDER BY DESC 4073474XX 311245700 2X 20319 402 1214 05 00 0541 4073475 311245600 2 20319 402 1214 05 00 0541 210 0223 196309600 196309600 174029300 2004 4 PHOSPHOR ORDER BY DESC 4073851XX ORDER BY DESC 386A84200 9 13 Mechanical Parts List Replaceable mechanical parts list Cont Fig amp index Tektronix part Serialno Serial no Mfr number number effective discontd Qty amp description code Mfr part number 3 1 441 1740 XX 1 CHASSIS CKT BD 370B ALUMINUM TK0191 4411740XX 2 255 0334 XX 1 PLASTIC CHANNEL 12 75 X 0 175 X 0 155 NYLON 11897 122 NN 2500 060 3 343 0778 XX 2 CLAMP CABLE 5MM ID NY
66. 70B Table 5 6 Collector Voltage Accuracy HORIZONTAL VOLTS DIV Calibrator DC Voltage Horizontal CURSOR Setting Readout 50 mV 0 000 mV 25mV 450 0 mV 440 8 mV to 459 2 mV 1V 0 00 mV 50 mV 9V 8 82 V to 9 18 V 20 V 0 00 mV 1 0V 180 V 176 3 V to 183 7 V 100 V 0 00 mV 5V 900 00 V 881 5 V to 918 5 V 500 V 0 00 mV 25V 1000 V 960 Vto 1040 V 370B Service Manual Performance Verification D5 Checking Base Input Impedance Specifications m Input impedance is at least 100 MQ DC Voltage Source 10 MQ 5 0 25 W Resistor To Left Base 370B settings Initialize the 370B then set the following controls as indicated CONFIGURATION BASE OPEN EXT DISPLAY HORIZONTAL 2 V BASE EMITTER CURSOR Mode DOT OUTPUTS ENABLED LEFT RIGHT STANDBY LEFT Protective Cover Closed Test Equipment setting Calibrator Output 20 V DC Checking Input Impedance 1 CHECK that the horizontal CURSOR reading is more than 18 3 V 370B Service Manual 5 51 Performance Verification Removing the Setup 2 Set the Calibrator output to 0 V 3 Remove the resistor and Calibrator D6 Checking Horizontal Displayed Noise Specifications m Displayed noise peak peak in COLLECTOR VOLTS is 0 02 of MAX PEAK VOLTS setting 370B settings Initialize the 370B then set the following controls as indicated COLLECTOR SUPPLY PO AC LARITY MAX PEAK POWER WATTS 220 VARIABLE COLLECTOR 0 SUP
67. 80 V LOOPING 23 ADJUST R502 80 V LOOPING adjustment on the A35 Looping board for optimum overlay of the left portion of the trace 370B Service Manual Performance Verification 370B Service Manual Examining 16 V LOOPING 24 Change the following 370B settings DISPLAY HORIZONTAL VOLTS DIV 2 V COLLECTOR COLLECTOR SUPPLY 16 V MAX PEAK VOLTS VARIABLE COLLECTOR 100 96 SUPPLY LOOPING COMPENSATION Minimum trace width 25 EXAMINE the left portion of the displayed trace for optimum overlay of the trace see Figure 5 2 If the overlay is not optimum the following adjustment is necessary Adjusting 16 V LOOPING 26 ADJUST R504 16 V LOOPING adjustment on the A35 Looping board for optimum overlay of the left portion of the trace 5 43 Performance Verification Horizontal Equipment Required see Table 5 3 m Calibrator DC Voltage Source m 1 MQ 5 0 25 W Resistor m 10 MQ 5 0 25 W Resistor D1 Adjusting H Balance NOTE The characteristics examined in this step are provided as examples of A10R460 typical instrument operation to aid in the adjustment of R460 they are not specifications 370B settings Initialize the 370B then set the following controls as indicated COLLECTOR SUPPLY AC POLARITY MAG X10 On CURSOR Mode DOT OUTPUTS ENABLED LEFT RIGHT STANDBY LEFT or RIGHT Protective Cover Closed 5 44 370B Service Manual Performance Verification D2 Checking horizontal MAG X10
68. Accuracy 370B Service Manual Determining if Adjustment Is Necessary 1 EXAMINE the horizontal CURSOR readout for a reading of 0 60 mV If the reading is not within these limits the following adjustment is necessary Adjusting H Balance 2 ADJUST H Balance adjustment R460 on the A10 Sense Board for a horizontal CURSOR readout of 0 mV A cutout in the right side rail provides adjustment access Specification OFFSET with MAG set to X10 is accurate to within 1 5 of the readout 0 3 division of the setting Digital Multimeter To Left Base 370B settings Initialize the 370B then set the following controls as indicated MAG X10 COLLECTOR SUPPLY AC POLARITY DISPLAY HORIZONTAL 200 mV BASE EMITTER Horizontal Position 20 5 45 Performance Verification STEP GENERATOR Mode VOLTAGE STEP AMPLITUDE 1V OFFSET 4V NUMBER OF STEPS 0 CURSOR DOT POSITION Mode DISPLAY OUTPUTS ENABLED LEFT RIGHT STANDBY LEFT Protective Cover Closed Test Equipment setting Digital Multimeter Mode DC Voltage Checking horizontal MAG X10 Accuracy 1 CHECK that the difference between horizontal CURSOR readout and Digital Multimeter reading is within 120 mV Removing the Setup 2 Change the following 370B setting LEFT RIGHT STANDBY STANDBY 3 Remove the digital multimeter leads from the 370B 5 46 370B Service Manual Performance Verification D3 Checking HORIZONTAL VENIEN BASE EM
69. CHING PARTS SHIELD ELEC INPUT RELAY MODULE AL BD ASSY KEY INTERFACE A13 ATTACHING PARTS SCR ASSEM WSHR 4 40 X 0 25 PNH STL END ATTACHING PARTS CKT BOARD ASSY INCLUDES BOARD ASSY SENSE A10 ATTACHING PARTS SCR ASSEM WSHR 4 40 X 0 25 PNH STL SPACER POST 19 05MM L W 4 40 THD EA END Mfr code TK0435 80009 TK0435 80009 TK0435 80009 80009 80009 TK0435 80009 TK0435 TK0435 80009 80009 TK0435 80009 80009 TK0435 80009 80009 TK0435 80009 TK0435 80009 Mfr part number ORDER BY DESC 174169300 ORDER BY DESC 3865484XX ORDER BY DESC 119810500 2110751 3373588XX 17691 300 4073855XX ORDER BY DESC ORDER BY DESC 3346696XX 671B12801 ORDER BY DESC 174161100 119347702 7772 312 3373629XX 671123802 ORDER BY DESC 671B21200 ORDER BY DESC 1290713XX 370B Service Manual Mechanical Parts List Replaceable mechanical parts list Cont Fig amp index number 57 58 59 60 61 62 63 77 78 79 86 370B Service Manual Tektronix part number 211 0538 XX 129 1328 XX 343 1446 213 0146 129 1131 214 3877 211 0661 671 1096 03 211 0661 129 1328 174 B904 00 Serial no effective Serial no discont d Qty Name amp description 2 N mn N SCREW MACHINE 6 32 X 0 312 FLH STL SPACER POST 15MM L 4 40 THD BRASS RETAINER CKT BD 12 7MM LNYL
70. CRT face plate Remove the A28 or A29 Graticule Illumination Lamp circuit board by removing the two screws that secure the board in place Replace the A28 or A29 Graticule Illumination Lamp circuit board in the reverse order of removal A33 Configuration Relay Circuit Board Remove and replace the A33 Configura tion Relay circuit board as follows 1 Remove the right front panel assembly See step 1 through 5 of the A14 LOR Key circuit board removal instructions NOTE When removing connectors from a board tag each one to prevent misconnection while reassembling Remove the connectors for J102 J103 and J104 from the board Remove the connectors for J302 J330 and J419 from the A10 Sense circuit board Remove the A33 Configuration Relay circuit board by removing the four screws from the board Replace the A33 Configuration Relay circuit board in the reverse order of removal A34 LOR Relay Circuit Board Remove and replace the A34 LOR Relay circuit board as follows 1 Remove the A9 L V Relay circuit board See the A9 L V Relay Circuit Board removal instructions Remove the two screws securing the wires to J91 and J95 Remove the connector for J301 from the A10 Sense circuit board 4 19 Maintenance 3 Remove the A31 Relay circuit board by removing the six screws securing the relays on the board to the guard box chassis 4 Replace the A34 LOR Relay circuit board in the reverse order of remova
71. Closed Examining the Limiter Indicator for 400 MAX PEAK VOLTS Range 1 EXAMINE the LIMITER indicator besides the LEFT RIGHT STANDBY for turn on when the VARIABLE COLLECTOR SUPPLY control is rotated clockwise Examining the Limiter Indicator for 2000 MAX PEAK VOLTS Range 2 Change the following 370B settings COLLECTOR SUPPLY MAX PEAK VOLTS 2000 MAX PEAK POWER 2 WATTS 3 EXAMINE the LIMITER indicator for turn on when the VARIABLE COLLECTOR SUPPLY control is rotated clockwise 370B Service Manual Performance Verification 4 Change the following 370B setting HORIZONTAL VOLTS DIV 5 V COLLECTOR 5 EXAMINE the LIMITER indicator for turn on when the VARIABLE COLLECTOR SUPPLY control is rotated clockwise G7 Examining the NOTE The characteristics examined in this step are examples of typical LIMITER Indicator in instrument operation they are not specifications Current Mode To Left COLLECTOR Patch Cord To Left EMITTER 370B settings Initialize the 370B then set the following controls as indicated DISPLAY VERTICAL CURRENT DIV 100uA COLLECTOR COLLECTOR SUPPLY MAX PEAK VOLTS 400 OUTPUTS ENABLED LEFT RIGHT STANDBY LEFT Protective Cover Closed Examining the Limiter for 0 08 MAX PEAK POWER WATTS Range 1 EXAMINE that the LIMITER indicator next to the LEFT RIGHT STAND BY lights when the VARIABLE COLLECTOR SUPPLY control is rotated clockwise and watch for the peak of the trace to be brig
72. D ELECTRICAL 18 AWG 7 0 L 5 4 W19 80009 196390800 91 210 0202 XX 1 TERMINAL LUG 0 146 ID LOCKING BRZ 1181 ORDER BY DESC ATTACHING PARTS 92 211 0565 XX 1 SCREW MACHINE 6 32 X 0 250 TRH STL TK0435 ORDER BY DESC END ATTACHING PARTS 93 210 0202 XX 1 TERMINAL LUG 0 146 ID LOCKING BRZ TK1181 ORDER BY DESC ATTACHING PARTS 94 210 0407 XX 1 NUT PLAIN HEX 6 32 X 0 25 BRS 73743 3038 402 END ATTACHING PARTS 95 220 A178 00 1 NUT PLATE 80009 220 17800 9 8 370B Service Manual A X EA VM N N x N 2 7 x N Figure 9 1 Cabinet Rear 9 9 370B Service Manual 5 N N X 9 9 e 4 y A 7 S ff x n N 07 Figure 9 2 Display Front 370B Service Manual 9 10 Mechanical Parts List Replaceable mechanical parts list Fig amp index number 2 1 25 26 27 28 370B Service Manual Tektronix part number 200 3281 XX 200 3276 XX 211 0538 XX 378 0276 XX 361 1381 XX 337 3328 XX 426 2133 XX 211 0512 XX 343 1269 XX 212 0022 XX 343 1270 XX 212 0022 XX 331 0491 XX 174 0313 00 174 0312 00 670 9324 XX 211 0062 XX 343 1268 378 0614 214 3886 253 0267 253 0137 426 191 00 211 0538 211 0541 214 3880 211 0661 Serial no
73. DOR cursor readout 0 1 x HORIZ DIV setting At least 100 Less than 10 mV With 1 resistor connected between Base and Emitter terminals BASE OPEN configuration and 0 Number of Steps 1 step division 1 step 10 division With x10 MAG 10 steps division With STEP MULTI 1 x Within 0 3 division 10 divisions in 0 1 division steps Within 1 5 of offset 0 1 x HORIZ DIV setting Within 1 5 of window cursor readout 0 3 x HORIZ DIV setting Within 0 1 x HORIZ DIV setting Specifications Table 1 7 Digital Storage Horizontal Acquisition Characteristic A D Converter Resolution Max data points Max sampling rate Min sampling rate Collector Volts Range Accuracy Base Emitter Volts Range Accuracy Step Generator display Range Accuracy typical Display offset Range Accuracy Display x10 MAG Accuracy Display Invert Accuracy Performance Requirement Operating Information 10 bits for 10 24 divisions 100 counts per division 1024 Line frequency x 1024 Line frequency x 2 50 mV div to 500 V div in a 1 2 5 sequence X10 MAG extends maximum sensitivity to 5 mV div 50 uV resolution Within 1 5 of dot cursor readout 0 05 x HORIZ DIV setting 50 mV div to 5 V div in a 1 2 5 sequences x 10 MAG extends maximum sensitivity to 5 mV div 50 uV resolution Within 1 5 of dot cursor readout 0 05 x HORIZ DIV setting 1 step division 1 step 10 divisions With
74. DR PO BOX 500 1101 SAMUELSON RD 701 SONORA AVE 600 18TH AVE U S HIGHWAY 1 P BOX 671 City state zip code DALLAS TX 75381 COLD SPRING KY 41076 9749 LAKE OSWEGO OR 97035 BEAVERTON OR 97077 0001 ROCKFORD IL 61101 GLENDALE CA 91201 2431 ROCKFORD IL 61108 5181 NEW BRUNSWICK NJ 08903 370B Service Manual Mechanical Parts List Replaceable mechanical parts list Fig amp index number 20 21 22 23 24 25 26 27 28 370B Service Manual Tektronix part number 390 0984 XX 211 0504 367 0535 212 0628 386 1624 386 1283 200 0728 426 2371 211 0507 211 0510 211 0538 124 0446 426 2372 XX 211 0507 XX 211 0538 XX 211 0510 XX 211 0504 XX 124 0447 XX 426 2141 XX 211 0559 XX 211 0504 XX 426 2142 XX 211 0559 XX 211 0504 XX 407 3890 XX 212 0002 XX 212 0004 XX 407 3890 XX Serial no effective Serial no discont d Qty Name amp description 1 CABINET SIDE LEFT ATTACHING PARTS SCREW MACHINE 6 32 X 0 250 PNH STL END ATTACHING PARTS HANDLE CARRYING 16 54 L BLUE VINYL ATTACHING PARTS SCREW SHOULDER 10 32 X 0 4 L RDH STL END ATTACHING PARTS PLATE HDL RTNG STAINLESS STEEL PLATE HDL MTG FRONT COVER HDL END 1 91 X 0 91 X 0 36 BLUEACETAL FRAME SECTION TOP LEFT TEK TAN AL ATTACHING PARTS SCREW MACHINE 6 32 X 0 312 PNH STL SCREW MACHINE 6 32 X 0 375 PNH STL SCREW MACH
75. ECT SI 100V 10A A19CR100 CR300 80009 152111900 ATTACHING PARTS 152 1120 00 2 SEMICOND DVC DI RECT SI 100V 10A A19CR200 CR400 80009 152112000 U410 ATTACHING PARTS 52 211 0244 XX 5 SCR ASSEM WSHR 4 40 X 0 312 PNH STL TK0435 7772 312 END ATTACHING PARTS 53 148 1010 00 1 RELAY SOL STATE 5A 250VAC A19U700 80009 148101000 ATTACHING PARTS 54 211 0244 2 SCR ASSEM WSHR 4 40 X 0 312 PNH STL TK0435 7772 312 END ATTACHING PARTS 55 131 3668 00 2 CONN RCPT ELEC CKT BD 4 PIN A19J64 J190 80009 131366800 56 131 3671 00 1 CONN RCPT ELEC CKT BD 15 PIN A19J196 80009 131367100 57 131 0589 00 3 TERMINAL PIN PRESSFIT PCB MALE STR A19J72 J194 22526 48283 087 J198 58 131 0608 00 2 CONN TERMINAL PRESSFIT PCB MALE STR A19J280 J290 22526 48283 018 59 174 0328 00 1 CA ASSY SP ELEC 4 18 AWG 15 5 L W190 80009 174032800 60 174 0308 00 1 CA ASSY SP ELEC W194 80009 174030800 61 348 1048 2 PAD CUSHIONING 150MM X 12MM X 13MM 0191 3481048 62 343 1273 XX 2 RETAINER CKT BD BRASS 80009 3431273XX ATTACHING PARTS 63 211 0504 XX 2 SCREW MACHINE 6 32 X 0 250 PNH STL TK0435 ORDER BY DESC END ATTACHING PARTS 64 671 B126 01 1 BOARD ASSY CPU 2 80009 671 12601 69 105 0899 XX 301393 301782 2 EJECTOR CKT BD NYLON 80009 1050899XX 105 0978 XX 301783 2 EJECTOR CKT BD NYLON 002 21 0608 70 337 3326 XX 301393 302428 1 SHIELD ELEC CPU BD 80009 3373326 ATTACHING PARTS 71 211 0661 XX 301393 302428 5 SC
76. EFT COLLECTOR To LEFT COLLECTOR To LEFT EMITTER To LEFT EMITTER SENSE Figure 5 3 Checking Collector high current range 16 CHECK that the Vertical CURSOR readout is within the limits given in Table 5 10 for 50 mA DIV Table 5 10 Collector High Current Accuracy VERTICAL CURRENT DIV VARIABLE COLLECTOR Vertical CURSOR Readout Setting SUPPLY 50 mA 112 5 mV 4 5A 4500 82 5 mA 100 225 mV 9 9000 165 mA 200 250 mV 10 10000 210 Checking 1 A DIV Accuracy 17 Change the following 370B settings MAG X10 Off POSITION Simultaneously press the up and down Position Control buttons then simultaneously press the left and right Position Control buttons 370B Service Manual 5 67 Performance Verification DISPLAY VERTICAL 1A COLLECTOR VARIABLE COLLECTOR Clockwise until the Horizontal SUPPLY CURSOR readout to about 250 mV 18 Move the spot to the graticule center with the Position Control buttons 19 Change the following 370B settings MAG X10 On VARIABLE COLLECTOR Set so the Horizontal CURSOR SUPPLY readout is nearest that noted in part 6 Difference value should be within 0 5 mV 20 CHECK that the Vertical CURSOR readout is within the limits given in Table 5 10 for 100 mA DIV when the Horizontal CURSOR readout is the same as that in part 6 Checking 2 A DIV Accuracy 21 Change the following 370B settings MAG X10 Off DISPLAY VERTICAL 2A COLLECTOR VARIABLE CO
77. EFT ENABLED Closed DC Current NOTE Before checking these parameters note the count error of the Digital Multimeter and subtract it from the reading obtained in the procedure Checking about 100 mA 1 Simultaneously press the FAST SHIFT and down Position Control buttons to move the displayed spot to the bottom left graticule line 2 Change the following 370B setting MEASUREMENT Press the REPEAT button several times to move the displayed spot to the top left graticule line The Digital Multimeter reading should be approximately 2000 mA 3 Check that the digital multimeter reading is between 1967 mA and 2033 mA NOTE Use a TEKTRONIX DM501A to check 370B Service Manual Performance Verification Checking INVERT 4 Press the STEP GENERATOR INVERT button to On Step Generator output should be automatically return to Step 0 5 Simultaneously press the FAST SHIFT and up Position Control buttons to move the displayed spot to the top left graticule line 6 Change the following 370B settings MEASUREMENT Press the REPEAT button several times to move the displayed spot to the bottom left graticule line The Digital Multimeter reading should be approximately 2000 mA 7 Check that the digital multimeter reading is between 1967 and 2033 mA Removing the Setup 8 Change the following 370B setting LEFT RIGHT STANDBY STANDBY 9 Disconnect the digital multimeter leads from the 370B Alte
78. ET SIDE RIGHT ATTACHING PARTS SCREW MACHINE 6 32 X 0 250 PNH STL END ATTACHING PARTS PANEL REAR 370B ALUMINUM ATTACHING PARTS SCREW MACHINE 6 32 X 0 312 PNH STL END ATTACHING PARTS RTNR CAB COVER BLUE PLASTIC ATTACHING PARTS SCREW TPG TF 8 32 X 0 625 FILH STL END ATTACHING PARTS MARKER IDENT MKD SERIAL GUARD FAN ATTACHING PARTS SPACER POST 21 5MM L 4 40 6 32 THD BRS END ATTACHING PARTS FILTER AIR 125MM X 5MM THK COVER FAN ALUMINUM ATTACHING PARTS SCREW MACHINE 4 40 X 0 25 PNH STL END ATTACHING PARTS RTNR CAB COVER BLUE PLASTIC ATTACHING PARTS SCREW TPG TF 8 32 X 0 625 FILH STL END ATTACHING PARTS FAN TUBEAXIAL B100 ATTACHING PARTS NUT PL ASSEM WA 6 32 X 0 312 STL END ATTACHING PARTS CABLE ASSY PWR W272 SPACER POST SPACER CKT BD 0 504 L X 0 188 HEX BRS INSULATOR PLATE CIRCUIT BOARD PC CKT BOARD ASSY INTERFACE A22 ATTACHING PARTS SCR ASSEM M3 X 6 PNH STL END ATTACHING PARTS CKT BOARD ASSY INCLUDES CONN RCPT ELEC A22 J3508J450 ATTACHING PARTS of A22 CA ASSY SP ELEC A22W220 INSULATOR FILM PRIMARY BOARD Mfr code 80009 TK0435 80009 TK0435 80009 83486 80009 80009 0191 80009 0435 80009 83486 80009 0435 80009 80009 80009 80009 80009 0191 80009 80009 80009 Mfr part number 3900985XX ORDER BY DESC 3333717XX ORDER BY DESC 3431272XX ORDER BY DESC 200330
79. HING PARTS 40 211 0507 XX 2 SCREW MACHINE 6 32 X 0 312 PNH STL TK0435 ORDER BY DESC END ATTACHING PARTS 41 670 9320 01 1 BOARD ASSY LV SUPPLY 19 80009 670932001 ATTACHING PARTS 42 211 0661 XX 3 SCR ASSEM WSHR 4 40 X 0 25 PNH STL TK0435 ORDER BY DESC 43 211 0507 XX 3 SCREW MACHINE 6 32 X 0 312 PNH STL 0435 ORDER BY DESC END ATTACHING PARTS CKT BOARD ASSY INCLUDES 44 214 3874 XX 1 HT SK PWR SPLY LV AL 80009 2143874 ATTACHING PARTS 45 211 0661 XX 3 SCR ASSEM WSHR 4 40 X 0 25 PNH STL TK0435 ORDER BY DESC END ATTACHING PARTS 9 14 370B Service Manual Mechanical Parts List Replaceable mechanical parts list Cont Fig amp index Tektronix part Serialno Serial no Mfr number number effective discontd Qty amp description code Mfr part number 46 151 0561 00 2 TRANSISTOR PNP SI PWR Q230 Q600 80009 151056200 ATTACHING PARTS 151 0562 00 1 TRANSISTOR PNP SI PWR A19Q130 80009 151056200 ATTACHING PARTS 47 211 0244 XX 3 SCR ASSEM WSHR 4 40 X 0 312 PNH STL TK0435 7772 312 END ATTACHING PARTS 48 156 2830 00 1 MICROCKT LINEAR VOLTAGE REG 12V A19U310 80009 156283000 ATTACHING PARTS 156 2831 00 1 MICROCKT LINEAR VOLTAGE REG 5V STR A19U100 80009 156283100 ATTACHING PARTS 49 211 0315 XX 4 SCR ASSEM WSHR 4 40 X 0 437 PHN STL TK0435 ORDER BY DESC 50 342 0790 XX 2 INSULATOR FILM MICA 0 07MA 80009 3420790 END ATTACHING PARTS 51 152 1119 00 2 SEMICOND DVC DI R
80. INE 6 32 X 0 312 FLH STL END ATTACHING PARTS STRIP TRIM TOP RIGHT FRAME SECTION TOP RIGHT TEK TAN AL ATTACHING PARTS SCREW MACHINE 6 32 X 0 312 PNH STL SCREW MACHINE 6 32 X 0 312 FLH STL SCREW MACHINE 6 32 X 0 375 PNH STL SCREW MACHINE 6 32 X 0 250 PNH STL END ATTACHING PARTS STRIP TRIM TOP RIGHT FRAME SECT CAB LEFT ATTACHING PARTS SCREW MACHINE 6 32 X 0 375 FLH STL SCREW MACHINE 6 32 X 0 250 PNH STL END ATTACHING PARTS FRAME SECT CAB RIGHT ATTACHING PARTS SCREW MACHINE 6 32 X 0 375 FLH STL SCREW MACHINE 6 32 X 0 250 PNH STL END ATTACHING PARTS BRACKET SUPPORT ALUMINUM ATTACHING PARTS SCREW MACHINE 8 32 X 0 25 FLH 100 DEG STL SCREW MACHINE 8 32 X 0 312 PNH STL END ATTACHING PARTS BRACKET SUPPORT ALUMINUM ATTACHING PARTS Mfr code 80009 0435 0191 93907 1943 0JR05 0JR05 80009 TK0435 TK0435 TK0435 80009 80009 TK0435 TK0435 TK0435 TK0435 80009 80009 TK0435 TK0435 80009 TK0435 TK0435 80009 0 01 0435 80009 Mfr part number 3900984XX ORDER BY DESC 3670535XX ORDER BY DESC ORDER BY DESC ORDER BY DESC 200 0728 XX 4262371XX ORDER BY DESC ORDER BY DESC ORDER BY DESC 1240446XX 4262372XX ORDER BY DESC ORDER BY DESC ORDER BY DESC ORDER BY DESC 1240447XX 4262141XX 1593 300 ORDER BY DESC 4262142XX 1593 300 ORDER BY DESC 4073890XX ORDER BY DESC ORDER BY DESC 4073890XX 9 5 Mec
81. ITTER Accuracy SPecifications and Range in STORE m The BASE EMITTER settings are accurate to within 1 5 of the readout Mode 0 05 division of the setting DC Voltage Source 370B settings Initialize the 370B then set the following controls as indicated DISPLAY HORIZONTAL 50 mV BASE EMITTER CURSOR Mode DOT CONFIGURATION BASE OPEN EXT OUTPUTS ENABLED Protective Cover Closed Test Equipment setting Calibrator Output 0 00 V NOTE Disregard the flashing cursor on the 370B display 370B Service Manual 5 47 Performance Verification Checking Base Emitter Accuracy 1 Change the following 370B setting LEFTLEFT RIGHT STANDBY LEFT 2 CHECK that the horizontal CURSOR readout is within the CURSOR Readout limits for each HORIZONTAL BASE EMITTER VOLTS DIV and DC Voltage setting listed in Table 5 5 There are two DC Voltage values given for each HORIZONTAL VOLTS DIV setting in Table 5 5 check for both To check the 2 V and 5 V Horizontal Volts Div settings push the Operate button on the Voltage Source Table 5 5 Base Emitter Voltage Accuracy HORIZONTAL VOLTS DIV Calibrator DC Voltage Horizontal CURSOR Setting Readout 440 8 mV to 459 2 mV 1763 mV to 1837 mV 17 63 V to 18 37 V Removing the Setup 3 Change the following Test Equipment setting Calibrator Output Standby 4 Disconnect the Calibrator leads from the 370B 5 48 370B Service Manual Performance Verification D4 Che
82. L FREQ 2 adjustment on the A3 A D board for a digital multimeter readout of 3 1 0 1 V 370B Service Manual Performance Verification A3 Checking the 2 V and 2 V Reference Adjusting the 2 V and 2 V Reference A19 R500 and R516 370B Service Manual w W The 2 V and 2 V Reference is accurate to within 0 001 V NOTE The characteristics examined in this step are examples of typical instrument operation they are not specifications To A19 2V TP500 2V TP510 Digital Multimeter To 370B Ground Jack 370B settings Initialize 370B Test Equipment Settings Digital Multimeter Mode DC Voltage Checking the 2 V Reference 1 Connect DMM with 500 on the 19 LV Supply Board 2 CHECK for a digital multimeter reading of 1 999 V to 2 001 V If not within these limits the following adjustment is necessary Adjusting the 2 V Reference 3 ADJUST 2 V ADJ on the 19 LV Supply Board for a digital multimeter reading of 2 000 V 5 15 Performance Verification Checking the 2 V Reference 4 Connect DMM with TP510 on the 19 LV Supply Board 5 CHECK for a digital multimeter reading of 1 999 V to 2 001 V If not within these limits perform part d Adjusting the 2 V Reference 6 ADJUST 2 V ADJ on the A19 LV Supply Board for a digital multimeter reading of 2 000 V Removing the Setup 7 Disconnect the positive lead of the digital multimeter from the test point 5 1
83. L ZERO 9 EXAMINE the digital multimeter for a reading between 0 995 V and 1 005 V 370B Service Manual 5 27 Performance Verification C2 Adjusting V Zero and H Zero A3R600 and A3R590 Removing the Setup 10 Change the following 370B setting DISPLAY Mode CAL OFF CAL OFF is initiated by pressing the STORE button while holding down the FAST SHIFT button 11 Disconnect the digital multimeter from TP648 and 80 NOTE The characteristics examined in this step are provided as examples of typical instrument operation to aid in the adjustment of R600 and R590 they are not specifications 370B settings Initialize the 370B then set the following controls as indicated COLLECTOR SUPPLY AC POLARITY CURSOR Mode DOT DISPLAY Mode CAL ZERO CAL ZERO is initiated by pressing the NON STORE button while holding down the FAST SHIFT button 370B Service Manual Performance Verification C3 Adjusting Storage Gain A3R610 370B Service Manual Determining if Adjustment is Necessary 1 Examine the vertical CURSOR readout for a reading that does not exceed 0 06 A and the horizontal CURSOR readout for a reading that does not exceed 0 06 V If the CURSOR readouts are not within these limits the following adjust ment is necessary Adjust H Zero and V Zero 2 Press INVERT button inDISPLAY MENU 3 Adjust R590 so that the horizontal CURSOR readout for a reading may not change Adjust
84. LE COLLECTOR 100 SUPPLY 19 EXAMINE the display for a horizontal trace starting from graticule center and extending out of the display area Examining 557 POLARITY 20 Change the following 370B settings COLLECTOR SUPPLY W POLARITY VARIABLE COLLECTOR 100 SUPPLY 21 EXAMINE the display for a horizontal trace extending along the top horizontal graticule line from the upper right corner 370B Service Manual Performance Verification 370B Service Manual Examining DC POLARITY 22 Change the following 370B setting COLLECTOR SUPPLY DC POLARITY 23 EXAMINE the display for the spot to position the peak of part 21 24 EXAMINE the Test Oscilloscope display for DC Examining LEAKAGE POLARITY 25 Change the following 370B setting COLLECTOR SUPPLY LEAKAGE POLARITY 26 EXAMINE the display for the spot to position the same as part 23 27 EXAMINE the Test Oscilloscope display for DC Removing the Setup 28 Change the following 370B setting LEFT RIGHT STANDBY STANDBY 29 Disconnect the Test Oscilloscope 5 115 Performance Verification 5 116 G6 Examining the LIMITER Indicator in Voltage Mode NOTE The characteristics examined in this step are examples of typical instrument operation they are not specifications 370B settings Initialize the 370B then set the following controls as indicated COLLECTOR SUPPLY MAX PEAK VOLTS 400 OUTPUTS ENABLED Protective Cover
85. LH STL TK0435 ORDER BY DESC END ATTACHING PARTS 70 122 0184 XX 1 ANGLE RAIL SUBPANEL MTG RIGHT 80009 1220184 ATTACHING PARTS 71 210 0586 XX 1 NUT PL ASSEM WA 4 40 X 0 25 STL TK0435 ORDER BY DESC 72 211 0038 XX 5 SCREW MACHINE 4 40 X 0 312 FLH STL TK0435 ORDER BY DESC END ATTACHING PARTS 73 351 0855 1 GUIDE PB 370B LEFT STANDBY RIGHT SWBD 80009 3510855 74 671 B244 00 1 BOARD ASSY LOR KEY A14 80009 671824400 ATTACHING PARTS 75 210 0586 XX 3 NUT PL ASSEM WA 4 40 X 0 25 STL TK0435 ORDER BY DESC END ATTACHING PARTS CKT BOARD ASSY INCLUDES 76 129 1128 XX 3 SPACER POST 5 1MM L POLYCARBONATE 80009 1291128 77 150 1176 00 2 LT EMITTING DIO RED 1405100 05400 80009 150117600 78 174 1832 00 1 CA ASSY SP ELEC 14 28 AWG 23 0 L RIBBON A14W140 80009 174183200 79 366 0617 XX 3 PUSH BUTTON SILVER GRAY 9 6 X 4 2 X 8 5MM 80009 3660617 80 426 2336 XX 1 SUBPANEL TEST F ALUMINUM 80009 4262336 81 333 3716 XX 1 PANEL FRONT 80009 3333716 82 426 2331 XX 1 FRAME POLYCARBONATE 80009 4262331 83 343 1084 2 CLAMP CABLE NYLON 80009 3431084 84 407 3857 XX 1 BRACKET CMPNT CKT BREAKER ALUMINUM 80009 4073857 ATTACHING PARTS 9 24 370B Service Manual Mechanical Parts List Replaceable mechanical parts list Cont Fig amp index number 85 86 87 88 89 Tektronix part Serialno Serial no number effective discont d 210 0586 XX 260 2499 00 198 5468 00 337
86. LL UNLOCK check A D BOARD Troubleshooting Tree 8 11 2 Fuse F100 Check A19 LV SUPPLY blown BOARD Disconnect P196 on A19 L VSUPPLY BOARD gt gt gt Connect P72 and Connect P194 and eS NO Connect P196 and aac YES Connect P64 and re M Fuse still M disconnect P64 on A19 jus stil disconnect P72 on 19 ies still disconnect P194 n A19 still disconnect P190 on A19 blows LV SUPPLY BOARD SMS LV SUPPLY BOARD ews LV SUPPLY BOARD aye LV SUPPLY BOARD Check A19 LV SUPPLY Check COLLECTOR Check A6 COLLECTOR Check A20 H V REG BOARD SUPPLY OUTPUT BOARD SUPPLY OUTPUT BOARD BOARD 4 Fuse still Connect P198 on A19 LV Check A19 LV SUPPLY blows SUPPLY BOARD BOARD 4 Fuse still blows YES Connect P190 and disconnect P198 on A19 LV SUPPLY BOARD Check boards connected Check boards in the to MOTHER BOARD DRAWER UNIT 8 12 Troubleshooting Tree cont 370B Service Manual Check 5 at Pin 14 of P100 11 MAIN KEY BOARD and 5VLK at Pin 197 W150 on A15 CONFIGURATION LED and 5YDS at A15 Pin 10 of W140 on A14 LOR KEY BOARD Push FAST button Then push Set POWER switch to OFF then 2 ON while pressing FAST button LEDs and number Then push FAST DISPLAY Each Check every LED brights at once on MEMORY buttons simultaneously and check Code displayed is FINISH voltage is OK and number on th
87. LLECTOR Move the spot to the graticule center SUPPLY with the Position Control buttons 22 Change the following 370B settings MAG X10 On VARIABLE COLLECTOR Set so the Horizontal CURSOR SUPPLY readout is nearest that noted in part 9 Difference value should be within 0 5 mV 23 CHECK that the Vertical CURSOR readout is within the limits given in Table 5 10 for 200 mA DIV when the Horizontal CURSOR readout is the same as that in part 6 5 68 370B Service Manual Performance Verification E7 Checking Vertical Displayed Noise 370B Service Manual Removing the Setup 24 Change the following 370B setting LEFT RIGHT STANDBY STANDBY 25 Open the Protective Cover 26 Remove the resistor Specifications m Collector and Base Current Mode Vertical Displayed noise are accurate to within 1 uA at 16 V and 80 V 2 uA at 400 V 5 uA at 2000 V MAX PEAK VOLTS setting except for switching noise at OA and V7 mode 370B settings Initialize the 370B then set the following controls as indicated DISPLAY Mode NON STORE VERTICAL CURRENT DIV 1 uA COLLECTOR HORIZONTAL VOLTS DIV 500V COLLECTOR COLLECTOR SUPPLY MAX PEAK VOLTS 2000V POSITION Mode DISPLAY OUTPUTS ENABLED VARIABLE COLLECTOR 100 96 SUPPLY Protective Cover Closed 5 69 Performance Verification 5 70 Checking Collector Vertical Displayed Noise In CONFIGURATION COLLECTOR to COLLECTOR SUPPLY mode 1 Press the up Position Control but
88. LON 80009 3430778XX 4 348 0948 XX 1 GROMMET PLASTIC BLACK RING 9 5MM ID 80009 3480948 5 351 0769 XX 2 GUIDE CKT BD 80009 3510769 6 343 1289 1 CLAMP CABLE STEEL 80009 3431289 7 343 1084 3 CLAMP CABLE NYLON 80009 3431084 8 255 1107 XX 1 PLASTIC CHANNEL 500 X 3 7 X 4 0MM NYLON 80009 2551107 9 255 0334 XX 1 PLASTIC CHANNEL 12 75 X 0 175 X 0 155 NYLON 11897 122 NN 2500 060 10 255 0334 XX 1 PLASTIC CHANNEL 12 75 X 0 175 X 0 155 NYLON 11897 122 2500 060 11 670 9309 09 1 CKT BOARD ASSY STEP GEN A7 80009 670930909 ATTACHING PARTS 12 211 0661 XX 3 SCR ASSEM WSHR 4 40 X 0 25 PNH STL TK0435 ORDER BY DESC END ATTACHING PARTS CKT BOARD ASSY INCLUDES 17 211 0315 XX 1 SCR ASSEM WSHR 4 40 X 0 437 PHN STL TK0435 ORDER BY DESC END ATTACHING PARTS 21 156 0446 00 1 MICROCKT DGTL 3 TERM POSI VOL REG 12V A7U170 80009 156044600 22 214 4003 XX 1 HEAT SINK XSTR TO 220 AL 80009 2144003 ATTACHING PARTS 23 211 0661 XX 1 SCR ASSEM WSHR 4 40 X 0 25 PNH STL TK0435 ORDER BY DESC 24 210 0586 XX 1 NUT PL ASSEM WA 4 40 X 0 25 STL TK0435 ORDER BY DESC END ATTACHING PARTS 26 174 0310 00 1 CA ASSY SP ELEC 10 22 AWG18 0 RIBBON W72 80009 174031000 27 671 0236 02 1 CIRCUIT BD ASSY MOTHER A1 80009 671023602 ATTACHING PARTS 28 211 0661 XX 8 SCR ASSEM WSHR 4 40 X 0 25 PNH STL TK0435 ORDER BY DESC END ATTACHING PARTS CKT BOARD ASSY INCLUDES 39 407 3479 XX 1 BRACKET CKT BD ALUMINUM 80009 4073479XX ATTAC
89. NE the difference of the vertical CURSOR readout between noted part 2 and 4 If the difference of readout is not within 20 mA the following adjustment may be necessary It is not specification Adjusting Looping Compensation 6 ADJUST Looping Balance adjustment R238 on the 10 Sense Board for a vertical CURSOR readout as noted in part 2 Return the LOOPING COMPENSATION control to fully counterclockwise 5 56 370B Service Manual Performance Verification E3 Adjusting Leakage Compensation A10R270 370B Service Manual 1 NOTE The characteristics examined in this step are provided as examples of typical instrument operation to aid in the adjustment of R270 they are not specifications 370B settings Initialize the 370B then set the following controls as indicated COLLECTOR SUPPLY LEAKAGE POLARITY DISPLAY 1 nA EMITTER VERTICAL CURRENT DIV CURSOR Mode DOT POSITION Mode DISPLAY OUTPUTS ENABLED Protective Cover Closed Determining if Adjustment is Necessary 1 Press the up Position Control button to position the dot center horizontal graticule line 2 EXAMINE the vertical CURSOR readout for a reading within 1 03 nA If the readout is not within these limits the following adjustment may be necessary Otherwise proceed to the next step 5 57 Performance Verification Adjusting Leakage Compensation 3 ADJUST Leakage Compensation adjustment R270 on the 10 Sense Board for a Verti
90. OD 80009 3660626 21 198 5686 00 1 WIRE SET ELEC W210 80009 198568600 22 260 2497 03 1 SWITCH ROTARY ENCODER S200 80009 260249703 ATTACHING PARTS 23 210 0207 XX 1 TERMINAL LUG 0 385 OD PLAIN BRS 12697 01136902 END ATTACHING PARTS 24 366 0621 XX 1 SHELL KNOB TEKTAN 30MM OD X 15MM H ABS 80009 3660621 25 377 0609 XX 1 INSERT KNOB 8 6MM ID X 16MM OD X 8MM H AL 80009 3770609XX ATTACHING PARTS 26 213 0022 XX 1 SETSCREW 4 40 X 0 188 STL 0 01 ORDER BY DESC END ATTACHING PARTS 27 671 B245 00 1 CKT BOARD ASSY CONFIG LED A15 80009 671 24500 ATTACHING PARTS 9 22 370B Service Manual Mechanical Parts List Replaceable mechanical parts list Cont Fig amp index number 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 370B Service Manual Tektronix part number 210 0586 XX 129 1128 XX 131 0589 00 174 1775 01 366 0617 XX 386 5395 XX 211 0025 XX 386 5919 XX 348 0970 XX 210 0269 XX 343 1367 XX 210 0407 XX 343 1286 XX 210 0407 XX 136 0887 XX 136 0888 XX 210 0241 XX 198 5680 01 198 5680 00 198 5683 00 198 5700 00 198 5681 01 198 5682 00 198 5679 00 343 0549 XX 407 3889 XX 211 0038 XX 407 3484 XX Serial no effective Serial no discont d Qiy Name amp description 2 NUT PL ASSEM WA 4 40 X 0 25 STL END ATTACHING PARTS CKT BOARD ASSY INCLUDE
91. ON SCREW TPG TF 6 20 X 0 312 TYPE B PNH STL SPACER POST 12 7MM L 4 40 THD BRASS END ATTACHING PARTS CKT BOARD ASSY INCLUDES HT SK CKT BD AL ATTACHING PARTS SCR ASSEM WSHR 4 40 X 0 25 PNH STL END ATTACHING PARTS BD ASSY CONFIG RELAY A33 ATTACHING PARTS SCR ASSEM WSHR 4 40 X 0 25 PNH STL SPACER POST 15MM 1 4 40 THD BRASS END ATTACHING PARTS CKT BOARD ASSY INCLUDES CA ASSY SP ELEC Mfr code 0435 80009 80009 0435 80009 80009 0435 80009 0435 80009 80009 Mfr part number ORDER BY DESC 1291328XX 3431446XX ORDER BY DESC 1291131 2143877 ORDER BY DESC 671109603 ORDER BY DESC 1291328XX 174B90400 9 33 Mechanical Parts List 9 34 370B Service Manual Figure 9 7 FDD Config Relay Sense Circuit Boards 2 3 2 9 il T 9 35 al 370B Service Manu Mechanical Parts List Replaceable mechanical parts list Fig amp index Tektronix part number number 070 A838 50 159 0260 XX 159 0259 XX 337 3344 02 063 3341 8 1 161 0066 00 2 161 0066 09 3 161 0066 10 4 161 0066 11 5 161 0157 00 6 161 0304 00 070 838 012 0991 00 016 0930 00 475 370B Service Manual Serial no effective Serial no discont d Qty amp description STANDARD ACCESSORIES USER MANUAL 370B FUSE CARTRIDGE 2A 250V MEDIUM BLOW FUSE CARTRIDGE 4A 125V MEDIUM BL
92. OW SHIELD ELEC PROTECTIVE COVER UTILITY SOFTWARE FD A1001 TEST ADAPTER BLANK ADAPTER A1002 ADAPTER TEST IN LINE ADAPTER A1005 ADAPTER TEST AXIAL LEAD ADAPTER 1 CA ASSY PWR 3 18 AWG 250V 10A 98 INCH STR STANDARD ONLY 1 CA ASSY PWR 3 0 75MM SQ 250V 10A 99 INCH OPTION A1 ONLY 1 CA ASSY PWR 3 0 1MM SQ 250V 10A 2 5 METER OPTION A2 ONLY 1 CA ASSY PWR 3 1 0MM SQ 250V 10A 2 5 METER OPTION A3 ONLY CABLE ASSY PWR 3 X 0 75MM SQ 250V 7 0 L OPTION A5 ONLY 1 CABLE ASSY PWR 3 X 1 0MM SQ 250V 10A 2 5 METER OPTION AC ONLY OPTIONAL ACCESSORIES SERVICE MANUAL 370B A1003 TEST ADAPTER TO 3 TO 66 A1007 TEST ADAPTER 4 amp 6 LEAD TRANSISTOR A1009 TEST ADAPTER 4 amp 6 LEAD FET A1010 TEST ADAPTER IC A1023 TEST ADAPTER SOT23 SMD ADAPTER GPIB CABLE 2m RACK MOUNT KIT CART ee Cree Ce Coe ares Cee Ce Mfr code TK2548 80009 80009 80009 80009 3109 3109 3109 3109 TK1267 80009 80009 Mfr part number PER TEK P N 1590260XX 1590259XX 3373344XX 0633341XX 161006600 86511000 BS 13 HOSVVF3G0 198 000 ORDER BY DESC 070A83800 0707780XX 9 37 Mechanical Parts List 9 38 370B Service Manual
93. PARTS CLAMP CABLE PLASTIC CA ASSY SP ELEC 10 22 AWG 5 0 L RIBBON W182 ASSY SP ELEC 9 26 AWG 7 5 L RIBBON W180 BOARD ASSY HV REG A20 ATTACHING PARTS SCR ASSEM WSHR 4 40 X 0 25 PNH STL END ATTACHING PARTS CKT BOARD ASSY INCLUDES HV MODULE A20U300 ATTACHING PARTS SCREW MACHINE 4 40 X 0 375 PNH STL NUT PL ASSEM WA 4 40 X 0 25 STL END ATTACHING PARTS TERM TEST POINT EYELET A20TP200 TP300 TP400 TERMINAL PIN PRESSFIT PCB MALE STR A20J182 J194 J200 RETAINER XSTR HV SST ATTACHING PARTS SCR ASSEM WSHR 4 40 X 0 25 PNH STL END ATTACHING PARTS SHIELD ELEC HV REG ATTACHING PARTS SCREW MACHINE 4 40 X 0 25 PNH STL END ATTACHING PARTS MARKER DENT MKD DANGER amp POT Mfr code 0435 80009 80009 80009 80009 0435 80009 0435 0435 0 260 22526 80009 0435 80009 0435 80009 Mfr part number ORDER BY DESC 3431288XX 174030900 174031400 670B21100 ORDER BY DESC 119216201 ORDER BY DESC ORDER BY DESC ORDER BY DESC 48283 087 3431275XX ORDER BY DESC 3373329XX ORDER BY DESC 3346694XX 9 21 Mechanical Parts List Replaceable mechanical parts list Cont Fig amp index Tektronix part Serialno Serial no Mfr number number effective discontd Qty amp description code Mfr part number 5 1 333 3514 XX 1 PANEL FRONT 371 PWR SW 80009 3333514 AT
94. PLY MAG X10 On DISPLAY Mode NON STORE HORIZONTAL VOLT DIV 5 mV COLLECTOR OUTPUTS ENABLED Protective Cover Closed 5 52 370B Service Manual Performance Verification Checking Noise at COLLECTOR VOLTS 1 CHECK that the spot width is no more than 3 2 mV 3 2 minor divisions peak peak see Table 5 7 Table 5 7 Displayed Horizontal Noise COLLECTOR SUPPLY MAX PEAK VOLTS Horizontal Spot Width Noise Collector Volts 16 3 2 mV 3 2 min div 80 16 3 2 div 400 80 mV 16 div 1 6 div 50 mV DIV 2000 400 8div 50mV DIV 2 Change the following 370B setting MAX PEAK VOLTS 80 3 CHECK that the spot width is no more than 16 mV 3 2 divisions peak peak see Table 5 7 4 Change the following 370B setting MAG X10 Off MAX PEAK VOLTS 400 5 CHECK that the spot width is no more than 80 mV 1 6 divisions peak peak see Table 5 7 370B Service Manual 5 53 Performance Verification Vertical E1 Adjusting V Balance 5 54 A10R250 Equipment Required see Table 5 3 Calibrator Precision Voltage and Current Source Resistor 2 5 MQ 0 1 0 5 W Resistor 250 kQ 0 1 0 5 W Resistor 25 MQ 0 1 0 5 W Resistor 0 025 Q 0 1 4 W NOTE The characteristics examined in this step are provided as examples of typical instrument operation to aid in the adjustment of R250 they are not specifications 370B settings Initialize the 370B then set the following c
95. Protective Cover Table 5 9 Collector Current Accuracy VERTICAL CURRENT DIV Calibrator DC Current Vertical CURSOR Readout Setting 8 82 uA to 9 18 uA 176 3 uA to 183 7 uA 4408 uA to 4592 uA 8 82 mA to 9 18 mA 20 mA 0 00 uA 1 0 180 0 176 3 to 183 7 370B Service Manual 5 63 Performance Verification COLLECTOR CURRENT Accuracy for 500 mA DIV E6b Checking through 2 A DIV Alternate 5 64 Method Dd Specification m STORE mode COLLECTOR CURRENT DIV MAG mode X10 settings are accurate to within 1 5 of readout 40 3 division of setting NOTE This step is recommended for full scale measurement of CURRENT DIV settings greater than 500 mA DIV DC Voltage Source To Left Collector 370B settings Initialize the 370B then set the following controls as indicated DISPLAY VERTICAL 500 mA COLLECTOR HORIZONTAL 50 mV COLLECTOR COLLECTOR SUPPLY POLARITY DC COLLECTOR SUPPLY MAX 400 PEAK VOLTS CURSOR Mode DOT POSITION Mode DISPLAY LEFT RIGHT STANDBY LEFT OUTPUT ENABLED Protective Cover Open 370B Service Manual Performance Verification Test Equipment setting Calibrator Output 112 5 mV Checking Accuracy 1 Move the spot to the graticule center with the Position Control buttons 2 Change the following 370B setting MAG X10 On 3 Note the Horizontal CURSOR readout 4 Change the following Test equipment and 370B settings Calibrator Output 2
96. Protective Cover Closed Test Equipment Settings Digital Multimeter Mode DC Voltage 5 119 Performance Verification 5 120 Checking Accuracy 1 CHECK that the AUX SUPPLY readout on the 370B display is 0 00 V AUX SUPPLY will not show on screen for 0 00 V 2 CHECK that the digital multimeter reading is within the limits given in Table 5 18 for 0 00 V Table 5 18 Auxiliary Supply Accuracy AUX readout Digital Multimeter Reading 0 00 V no display 0 05 V 40 00 V 39 35 V to 40 65 V 40 00 V 40 65 V to 39 35 V Checking Resolution 3 CHECK that each time one of the AUX SUPPLY arrow buttons up or down is pressed the AUX SUPPLY readout and digital multimeter reading change by 20 mV Checking Range 4 Change the following 370B setting AUX SUPPLY 40 00 V as indicated in the AUX SUPPLY readout 5 CHECK that the digital multimeter measurement is within the limits given in Table 5 18 for 40 00 V 6 Change the following 370B setting AUX SUPPLY 40 00 V as indicated in the AUX SUPPLY readout 7 CHECK that the digital multimeter measurement is within the limits given in Table 5 18 for 40 00 V Removing the Setup 8 Disconnect the digital multimeter leads from the 370B 370B Service Manual Performance Verification H2 Checking AUX O SUPPLY Ripple and Noise Specification m Displayed Ripple and Noise is less than 50 mV peak to peak To LEFT COLLECTOR To AUX SUPPLY O
97. R ASSEM WSHR 4 40 X 0 25 PNH STL TK0435 ORDER BY DESC END ATTACHING PARTS 72 671 B213 00 1 BOARD ASSY A D A3 80009 671821300 370B Service Manual 9 15 Mechanical Parts List Replaceable mechanical parts list Cont Fig amp index Tektronix part Serialno Serial number number effective discont d 73 131 3650 00 79 337 3326 XX 80 211 0661 XX 301393 302428 81 670 9306 04 85 105 0899 301393 301782 105 0978 301783 86 337 3326 87 211 0661 88 670 9307 05 93 337 3326 XX 301393 302428 94 211 0661 301393 302428 9 16 Qty amp description 1 1 CONN PLUG ELEC CKT BD RTANG 2 X 32 0 1 SP A3P30 SHIELD ELEC CPU BD ATTACHING PARTS SCR ASSEM WSHR 4 40 X 0 25 PNH STL END ATTACHING PARTS BOARD ASSY DGTL DISPLAY 4 EJECTOR CKT BD NYLON EJECTOR CKT BD NYLON SHIELD ELEC CPU BD ATTACHING PARTS SCR ASSEM WSHR 4 40 X 0 25 PNH STL END ATTACHING PARTS BOARD ASSY DISPLAY 5 SHIELD ELEC CPU BD ATTACHING PARTS SCR ASSEM WSHR 4 40 X 0 25 PNH STL END ATTACHING PARTS Mfr code 80009 80009 0435 80009 80009 007 80009 0435 80009 80009 0435 Mfr part number 131365000 3373326XX ORDER BY DESC 670930604 1050899XX 21 0608 3373326XX ORDER BY DESC 670930705 3373326XX ORDER BY DESC 370B Service Manual Figure 9 3 C
98. R OF STEPS OFFSET POLARITY INVERT STEP MULTI 1X STORE 2 A COLLECTOR 2 V COLLECTOR Off 16 0 08 OO CURRENT 50 nA 5 0 0 nA Off Off 370B Service Manual Performance Verification PULSE Off ACQ MODE NORM MEASUREMENT REPEAT MAG X10 Off POSITION CURSOR CURSOR OFF AUX SUPPLY 0 00 V CONFIGURATION BASE STEP GEN VARIABLE COLLECTOR SUPPLY 0 RIGHT LEFT STANDBY STANDBY Test Equipment The test equipment listed in Table 5 3 is required for a complete Performance Check and Adjustment of the instrument However complete checking or adjusting may not always be necessary or desirable You may be satisfied with checking only selected characteristics thereby reducing the amount of test equipment actually required The specifications for test equipment listed in Table 5 3 are the minimum required to check performance requirements of the 370B Detailed operating instructions for test equipment are not given in these procedures refer to the test equipment instruction manual if more information is needed Special Futures Special fixtures are used where they facilitate instrument adjustment These fixtures are available from Tektronix Inc Order by part number from Tektronix Field Offices or representatives Test Equipment The checks and adjustment procedures are based on the first item of equipment Alternatives given as an example When other equipment is substituted control settings or setups may have to be altered I
99. Remove and replace the A12 Sub Key circuit board as follows 1 Remove the A11 Main Key circuit board See the NOTE in the last part of the A11 Main Key Circuit Board removal instructions 2 Remove the A12 Sub Key circuit board by removing the six spacer posts from the board 3 Replace the A12 Sub Key circuit board in the reverse order of removal A14 LOR Key Circuit Board Remove and replace the A14 LOR Key circuit board as follows 1 Pull out the drawer unit from the main body of the 370B 2 Remove the protective box from the Test Adapters 3 Remove the four flat head screws securing the Test Adapter Mounting Plate assembly to the center front of the drawer unit 4 Remove the two flat head screws securing the right front panel assembly to the right front side of the drawer unit 5 Remove the right front panel assembly by lifting it out 6 Remove the connector J140 from the A10 Sense circuit board 7 Remove the A14 LOR Key circuit board by removing the three nuts securing the board 8 Replace the A14 LOR Key circuit board in the reverse order of removal A15 Configuration LED Circuit Board CAUTION When replacing or removing the rotary encoder S200 tighten the mounting nuts to a torque of 8 kg cm when remounting the encoder Excessive tightening torque can cause failures 4 15 Maintenance Remove and replace the A15 Configuration LED circuit board as follows 1 2 1Pull out the drawer unit
100. S SPACER POST 5 1MM L POLYCARBONATE TTERMINAL PIN PRESSFIT PCB MALE STR A15J200 J210 CA ASSY SP ELEC 16 28 AWG 250MM L RIBBON A15W150 PUSH BUTTON SILVER GRAY 9 6 X 4 2 X 8 5MM PLATE MTG ASSY TEST ADAPTER ATTACHING PARTS SCREW MACHINE 4 40 X 0 375 FLH STL END ATTACHING PARTS PLATE ELEC GND ALUMINUM SHLD GSKT ELEK FINGER TYPE 0 75 L TERMINAL LUG 0 257 ID PLAIN BRS TINNED CLAMP LOOP 3 3MM ID NYLON ATTACHING PARTS NUT PLAIN HEX 6 32 X 0 25 BRS END ATTACHING PARTS CLAMP CABLE 6 8 ID NYLON ATTACHING PARTS NUT PLAIN HEX 6 32 X 0 25 BRS END ATTACHING PARTS SOCKET PIN TERM 0 16 DIA RED SOCKET PIN TERM 0 16 DIA GRAY TERMINAL LUG 0 515 ID PLAIN STL WIRE SET ELEC W91 WIRE SET ELEC W95 WIRE SET ELEC W3 WIRE SET ELEC W4 WIRE SET ELEC W104 WIRE SET ELEC W103 WIRE SET ELEC W102 STRAP TIEDOWN E 0 098 W X 4 0 LZYTEL BRACKET MTG ADAPTER PL W PRESSNUT AL ATTACHING PARTS SCREW MACHINE 4 40 X 0 312 FLH STL END ATTACHING PARTS BRACKET SW MTG ALUMINUM ATTACHING PARTS Mfr code 0435 80009 22526 80009 80009 80009 0435 80009 80009 0 01 73743 80009 73743 80009 80009 1665 80009 80009 80009 80009 80009 80009 80009 1499 80009 0435 80009 Mfr part number ORDER BY DESC 1291128XX 48283 087 174177501 3660617XX 3865395XX ORDER BY DESC 386591 9XX 3480970XX 905 020 3
101. S down Step Generator VOLTAGE Step Generator CURRENT Step Generator OFFSET OPPOSE Step Generator OFFSET AID Step Generator POLARITY Step Generator MULTI Step Generator PULSE AUX up AUX down CURSOR Mode up CURSOR Mode down Position CURSOR Message MEMORY up MEMORY down SAVE RECALL PEAK VOLTS up PEAK VOLTS down PEAK WATTS up PEAK WATTS down POLARITY up POLARITY down HARDCOPY PLOT ACQ MODE up ACQ MODE down REPEAT SINGLE SWEEP MAG FAST SHIFT OF STEPS up OF STEPS down VOLTAGE CURRENT OPPOSE AID STEP POLARITY STEP MULTI PULSE up AUX up AUX down CURSOR up CURSOR down CURSOR 370B Service Manual Maintenance 370B Service Manual Table 4 2 Front Panel Control Identification Cont Control Position DISPLAY Position Control up Position Control left Position Control down Position Control right CONFIGURATION up CONFIGURATION down LEFT STANDBY RIGHT INTERLOCK VERTICAL CURRENT DIV HORIZONTAL VOLTS DIV STEP AMPLITUDE VARIABLE COLLECTOR SUPPLY OUTPUTS PROTECTIVE COVER User Initiated Diagnostic Routine Message DISPLAY POSITION up POSITION left POSITION down POSITION right CONFIGURATION up CONFIGURATION down LEFT STANDBY RIGHT COVER ON COVER OFF VERTICAL XX 0 16 HORIZONTAL 0 16 STEP AMP XX 0 16 VARIABLE XX 0 25 OUTPUT ENABLE OUTPUT DISABLE COVER ON COVER OFF Pressing both the FAST SHIFT button and Position DISPLAY bu
102. Service Manual Tektronix 370B Programmable Curve Tracer 070 A842 50 Revision A 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 All rights reserved Licensed software products are owned by Tektronix or its suppliers and are protected by United States copyright laws and international treaty provisions 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 and TEK are registered trademarks of Tektronix Inc Contacting Tektronix Tektronix Inc 14200 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 m Worldwide visit www tektronix com to find contacts in your area Warranty 2 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 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 i
103. Supply PhS actrees Vata ov eb ce e b dae tee e e Rs 5 119 Table of Contents Instrument Options Electrical Parts List Diagrams Mechanical Parts List Configurati l Su terae UR 5 122 Key Operation and Floppy Disk 5 129 6 1 ACCESSO ES ied o en a te m b aet iUt uet pa S bed 6 2 Replaceable Electrical Parts 7 1 Parts Ordering 7 1 Using the Replaceable Electrical Parts 1151 7 2 Diagrams eee ut etn nr Ret e wegen iem a eei 8 1 Mechanical Parts List 9 1 Parts Ordering 9 1 Using the Replaceable Parts List llle 9 2 370B Service Manual Table of Contents List of Figures 370B Service Manual Figure 2 1 Example of Kelvin sense connection 2 6 Figure 2 2 Location of the Rackmount Latch Release 2 7 Figure 2 3 Rackmount hole spacing 2 8 Figure 2 4 Rackmounting Length and Clearance 2 8 Figure 2 5 Rackmounting Hardware 2 9 Figure 2 6 Mounting Stationary Rackmount Sections 2 10 Figure 2 7 Cabinet to Rackmount Conversion 2 12 Figure 3 1
104. TACHING PARTS 2 200 0103 XX 1 NUT PLAIN KNURL 0 25 28 X 0 375 INCH OD BRS TK0588 ORDER BY DESC 3 355 0507 XX 1 STUD SHOULDERED BINDING POST BRS TK0588 ORDER BY DESC 4 210 0455 XX 1 NUT PLAIN HEX 0 25 28 X 0 375 BRS 73743 3089 402 5 210 0046 XX 1 WASHER LOCK 0 261 ID INTL 0 018 THK STL 78189 1214 05 00 0541 END ATTACHING PARTS 6 344 0396 XX 1 CLIP CABLE PVC 80009 3440396 7 426 2334 XX 1 SUBPANEL TEST F 80009 4262334XX 8 333 3718 XX 1 PANEL FRONT 80009 3333718XX 9 407 3472 XX 1 BRACKET ANGLE LOWER PANEL 80009 4073472 ATTACHING PARTS 10 210 0586 XX 2 NUT PLASSEM WA 4 40 X 0 25 STL 0435 ORDER BY DESC 11 211 0038 2 SCREW MACHINE 4 40 X 0 312 FLH STL TK0435 ORDER BY DESC END ATTACHING PARTS 12 122 0183 XX 1 ANGLE RAIL SUBPANEL MTG LEFT 80009 1220183XX ATTACHING PARTS 13 210 0586 XX 1 NUT PLASSEM WA 4 40 X 0 25 STL 0435 ORDER BY DESC 14 211 0038 XX 5 SCREW MACHINE 4 40 X 0 312 FLH STL TK0435 ORDER BY DESC END ATTACHING PARTS 15 351 0854 XX 1 GUIDE PB 370B VAR COIL SUPPLY BD PC 80009 3510854 ATTACHING PARTS 16 210 0586 XX 2 NUT PLASSEM WA 4 40 X 0 25 STL TK0435 ORDER BY DESC END ATTACHING PARTS 17 311 2457 00 1 RES VAR NONWW PNL 10K OHM 1 2W 2096 R210 80009 311245700 ATTACHING PARTS 18 210 0583 XX 1 NUT PLAIN HEX 0 25 32 X 0 312 BRS 73743 2X 20319 402 19 210 0046 XX 1 WASHER LOCK 0 261 ID INTL 0 018 THK STL 78189 1214 05 00 0541 END ATTACHING PARTS 20 366 0626 XX 1 KNOB SILVER GRAY 12MM
105. TACHING PARTS 41 441 1948 1 CHAS ASSY CURV TRCR REAR AL 80009 4411948 ATTACHING PARTS 42 211 0507 XX 4 SCREW MACHINE 6 32 X 0 312 PNH STL 0435 ORDER BY DESC END ATTACHING PARTS 43 441 1743 XX 1 CHASSIS CRT LEFT 80009 4411743 ATTACHING PARTS 44 211 0504 XX 3 SCREW MACHINE 6 32 X 0 250 PNH STL 0435 ORDER BY DESC END ATTACHING PARTS 45 670 9319 02 1 BOARD ASSY CRT 18 80009 670931902 ATTACHING PARTS 46 129 1139 4 SPACER POST 25MM L W4 40 THD BRASS 80009 1291139 END ATTACHING PARTS CKT BOARD ASSY INCLUDES 47 131 0608 00 1 CONN TERMINAL PRESSFIT PCB MALE STR A18J180 22526 48283 018 TERMINAL PIN PRESSFIT PCB MALE STR 131 0589 00 3 A18J182 J184 J186 22526 48283 087 48 342 0785 XX 1 INSULATOR PLATE CRT OUTPUT 80009 3420785 ATTACHING PARTS 9 20 370B Service Manual Mechanical Parts List Replaceable mechanical parts list Cont Fig amp index number 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 370B Service Manual Tektronix part number 211 0661 XX 343 1288 174 0309 00 174 0314 00 670 211 00 211 0661 119 2162 01 211 0012 210 0586 214 0579 00 131 0589 00 343 1275 XX 211 0661 XX 337 3329 XX 211 0008 XX 334 6694 XX Serial no effective Serial no discont d Qty amp description 4 SCR ASSEM WSHR 4 40 X 0 25 PNH STL END ATTACHING
106. TK0435 TK0435 80009 TK0435 Mfr part number 2003281XX 2003276XX ORDER BY DESC 3780276XX 3611381XX 3373328XX 4262133XX ORDER BY DESC 3431269XX 2011 300 3431270XX 2011 300 3310491XX 174031300 174031200 ORDER BY DESC 3431268XX ORDER BY DESC 2143886XX 2530267XX 2650 4262333XX ORDER BY DESC ORDER BY DESC 2143880XX ORDER BY DESC 9 11 Mechanical Parts List Replaceable mechanical parts list Cont Fig amp index Tektronix part Serialno Serial no Mfr number number effective discontd Qty description code Mfr part number 29 255 1106 1 PLASTIC CHANNEL 250 X 3 3 X 4 0MM NYLON 80009 2551106 30 334 6691 XX 1 MARKER IDENT MKD DANGER 80009 3346691XX 31 334 6805 XX 1 MARKER IDENT MKD WARNING 80009 3346805 32 337 3325 XX 1 SHIELD CRT 80009 3373325XX ATTACHING PARTS 33 211 0661 XX 4 SCR ASSEM WSHR 4 40 X 0 25 PNH STL TK0435 ORDER BY DESC END ATTACHING PARTS 34 108 1345 02 1 COIL TUBE DEFL TRACE ROTATOR L100 80009 108134502 ATTACHING PARTS 35 211 0661 XX 2 SCR ASSEM WSHR 4 40 X 0 25 PNH STL TK0435 ORDER BY DESC END ATTACHING PARTS 36 129 1123 XX 2 SPACER POST 33MM L 4 40 THD BRASS 80009 1291123 ATTACHING PARTS 37 211 0661 XX 2 SCR ASSEM WSHR 4 40 X 0 25 PNH STL TK0435 ORDER BY DESC END ATTACHING PARTS 38 348 0948 XX 1 GROMMET PLASTIC BLACK RING 9 5MM ID 80009 3480948XX 39 108 1347 01 1 COIL TUBE DEFL Y AXIS ALIGNMENT L120 80009 108134701
107. TOR POLARITY INVERT ON 11 CHECK that the Digital Multimeter readout is 49 1 mV to 50 9 mV 370B Service Manual 5 83 Performance Verification F6 Checking Step Incremental Accuracy in 5 84 VOLTAGE Mode 12 Removing the Setup 13 Change the following 370B setting LEFT RIGHT STANDBY STANDBY 14 Remove the Digital Multimeter Dd Specifications Incremental accuracy is 1 5 26 Moving the Store Non Store Jumper 1 Change the following 370B setting POWER OFF 2 Remove the A3 A D Board from the card cage located on the right side of the 370B NOTE See test Point and Adjiustment Locations 1 for the location of A3 and jumper J34 For details on removing and replacing Plug in Bords see the instructions under Component Removal and Replacement in section 3 maintenance 3 Change the position of Jumper 134 from pins 1 2 to pins 2 4 CAL position When the jumper is moved from pins 1 2 to pins 2 4 STORE Mode is disabled 4 Replace the A3 A D Board in the 370B card cage Do not re install the circuit board retainers 5 Change the following 370B setting POWER ON 6 Press the up and right Position Control buttons to moved the displayed spot to the graticule center V 5 0 H 5 0 370B Service Manual Performance Verification 370B Service Manual 370B settings To Left Base Digital Multimeter Initialize the 370B then set the following controls as indicated
108. TTACHING PARTS ASSY SP ELEC 4 22 AWG 16 0 L A6W64 CONN RCPT ELEC HEADER 16 PIN A6J60 CONN TERMINAL PRESSFIT PCB MALE STR A6J66 TERMINAL PIN PRESSFIT PCB MALE STR A6J62 BRACKET CKT BD COLLECTOR SUPPLY OUTPUT CLAMP CABLE NYLON SHIELD ELEC COLLECTOR SUPPLY ATTACHING PARTS SCREW MACHINE 4 40 X 0 25 PNH STL END ATTACHING PARTS MARKER DENT MKD DANGER amp POT BRACKET XFMR LEFT ALUMINUM ATTACHING PARTS SCREW MACHINE 10 32 X 0 375 PNH STL END ATTACHING PARTS BRACKET XFMR RIGHT ALUMINUM ATTACHING PARTS SCREW MACHINE 10 32 X 0 375 PNH STL END ATTACHING PARTS HEAT SINK ELEC TRANSFORMER ALUMINUM ATTACHING PARTS SCREW MACHINE 6 32 X 0 312 FLH STL END ATTACHING PARTS XFMR PWR STU 100 120VAC IN 48 66HZ T100 ATTACHING PARTS Mfr code 80009 TK0435 TK0435 80009 80009 TK0435 80009 80009 0191 0435 80009 80009 22526 22526 80009 80009 80009 0435 80009 80009 0435 80009 0435 80009 0435 80009 Mfr part number 670930806 ORDER BY DESC ORDER BY DESC 151120100 151120200 ORDER BY DESC 3420787XX 174030400 260233201 ORDER BY DESC 174030100 131367200 48283 018 48283 087 4073470XX 3431084XX 3373330XX ORDER BY DESC 3346695XX 4073478XX MACHINE SCREW 4073907XX MACHINE SCREW 2143974 ORDER BY DESC 120167801 9 19 Mechanical Parts List Replaceable mechanical pa
109. UPPLY MU 6065 755 18 crt output 6065 757 REGULATOR A20 3 o amp o 8 9 Test Point and Adjustment Locations 3 370B Service Manual 370B Service Manual 1 START 370B POWER ON gt Number on the MEMORY INDEX counts down 2 REPEAT LED is blinking Adjust INTENSITY and FOCUS controls for a well defined visible display YES Error message appears Display adjusted for optimum focus CRT brightness Check A3 A D BOARD 5 hn Check A18 CRT the EMORY i INDEX counts CRT brightness OUTPUT BOARD and down A20 H V REG BOARD p MEMORY INDEX DISPLAY blinks 2 Check A19 LV SUPPLY BOARD Troubleshoot ROM or RAM Tum GRID BIAS R210 on 500 for 2V TP510 for 2V indicated by blinking number A20 H V REG BOARD fully TP310 for 12V TP410 for 12V in the INDEX DISPLAY CCW TP130 for 6 5V TP230 for 6 5V 01 ROM A2 BOARD TP100 for 5V 02 RAM A2 BOARD 03 DISC RAM A3 BOARD Disconnect P180 and gt f P182 on A18 CRT gt CRT brightness OUTPUT Z signal Check A5 DISPLAY Any LED on BOARD Then check Pin 7 present CONTROL BOARD FRONT PANEL of P180 flashs All TAP Voltage OK Check A20 H V REG Check A18 CRT OUTPUT BOARD BOARD Check A2 CPU BOARD 370B Service Manual If error message is P
110. URATION BASE COMMON Operation 4 Change the following 370B setting CONFIGURATION EMITTER STEP GEN 5 EXAMINE the green LED in the STEP GENERATOR POLARITY window changes from to and the CRT to see that the displayed waveform changes from right to left from graticule center The red INVERT LED will not light 6 Change the following 370B setting CONFIGURATION BASE STEP GEN Examining the COLLECTOR SUPPLY POLARITY Operation 7 Change the following 370B setting COLLECTOR SUPPLY UJ POLARITY 8 EXAMINE the green LED in the STEP GENERATOR POLARITY window changes from to and the CRT to see that the displayed waveform is above the horizontal center graticule line The red INVERT LED will not light 5 103 Performance Verification Collector Supply G1 Adjusting Collector Supply Amplifier Offset A6R412 5 104 Equipment Required see Table 5 3 m Digital Multimeter NOTE The characteristics examined in this step are examples of typical instrument operation they are not specifications 370B settings POWER OFF Removing the Electrical Shield 1 Change the following 370B setting POWER OFF WARNING To avoid electric shock hazard be certain the 370B POWER switch is set to OFF before removing or replacing the electrical shield and connecting the digital multimeter to the 370B 2 Usea 1 Pozidriv screwdriver to remove the electric shield on the left side of the 370B that
111. UT Patch Cord 370B settings Initialize the 370B then set the following controls as indicated DISPLAY Mode NON STORE HORIZONTAL VOLTS DIV 50 mV COLLECTOR COLLECTOR SUPPLY POLARITY AC LEFT RIGHT STANDBY LEFT Checking Ripple and Noise 1 CHECK that the spot width is within 1 horizontal division Removing the Setup 2 Disconnect the patch cord from the 370B 370B Service Manual 5 121 Performance Verification Configuration I1 Examining Collector 5 122 Configuration Equipment Required see Table 5 3 m Test Oscilloscope m Digital Multimeter NOTE The characteristics examined in this step are examples of typical instrument operation they are not specifications The following procedure checks operation of the relays that carry the Collector Supply to the Test Fixture Adapter Jacks Test Oscilloscope ertical nput Qj To Left Collector To 370B Ground Jack 370B settings Initialize the 370B then set the following controls as indicated LEFT RIGHT STANDBY LEFT OUTPUTS ENABLED Test Equipment Settings Test Oscilloscope Vertical Sensitivity 5 Vidiv DC Horizontal Scale 2ms div Trigger Mode Auto Trigger Source Line 370B Service Manual Performance Verification 370B Service Manual Examining Internal Operation for LEFT 1 Connect a test lead with a banana plug to the LEFT C Collector jack Connect a Probe hook from the Test Oscilloscope to the test leads clip
112. adjustment For the implementation of this adjustment pattern refer to Section of Performance Verification Pressing the FAST SHIFT button exits this routine m Push Button Test The 370B executes push button test FAST SHIFT button is not tested in this case If an error is found the error message is displayed at the bottom of the CRT The Error Message is indicated by the following format STRING KEY ERROR STRING identifies the front panel control as listed in Table 4 2 The following message appears on the text area of the CRT simultaneously with the above error message PRESS FAST KEY TO GO ON You can ignore the displayed error and push the FAST SHIFT button to carry out the measurement but the displayed key function will not necessarily occur correctly Table 4 2 Front Panel Control Identification Control Message Display NON STORE NON STORE Display STORE STORE Display REF REF Display VIEW VIEW Display ENTER ENTER Display INVERT INVERT 4 25 Maintenance Table 4 2 Front Panel Control Identification Cont Control MEMORY up MEMORY down Setup SAVE Setup RECALL MAX PEAK VOLTS up MAX PEAK VOLTS down MAX PEAK POWER WATTS up MAX PEAK POWER WATTS down Collector Supply POLARITY up Collector Supply POLARITY down HARDCOPY GPIB PLOT ACQ MODE STORE MODE up ACQ MODE STORE MODE down Measurement REPEAT Measurement SINGLE Measurement SWEEP MAG FAST SHIFT NUMBER OF STEPS up NUMBER OF STEP
113. adjusts the curvature of the sides top and bottom of the test pattern m TRACE ROTATION tilts the test pattern about a pivot point approximately 2 1 2 divisions from the right side of the graticule on the horizontal center line m ORTHOGONALITY changes the test pattern shape from rhombic to rectangular m X GAIN and Y GAIN change the test pattern from rectangular to square m Front panel POSITION controls change the position of the whole display Checking Orthogonality 9 Change the following 370B settings POSITION controls Vertical and Horizontal Position the center dot to graticule center TRACE ROTATION Position the three intermediate horizontal dots on the center horizon tal graticule line 10 CHECK that the three intermediate vertical dots conform to the center vertical graticule line within 0 5 minor division If the dots do not conform the following adjustment is necessary 370B Service Manual 5 33 Performance Verification 5 34 Adjusting Orthogonality 11 ADJUST Orthogonality adjustment R80 on the A5 Display Control Board so that the three intermediate vertical dots conform to the center vertical graticule line Examining Non Store Gain 12 EXAMINE the display to determine if the Dot Pattern s outer eight dots are positioned within the inner and outer frame patterns If the positioning is not correct the following adjustment is necessary Adjusting X Gain and Y Gain 13 ADJUST X Gain a
114. air by allowing you to exchange most modules for re manufactured ones 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 370B Service Manual Specifications a IUE Product Overview 370B Service Manual The 370B Programmable Curve Tracer is a high performance GPIB program mable digital storage curve tracer that provides static and dynamic semiconduc tor device testing This versatile instrument stimulates measures and displays the semiconductor characteristics of a variety of two three and four terminal devices including bipolar transistors field effect transistors silicon controlled rectifiers diodes thyristors opto isolators wafers integrated circuits etc A variety of measurements can be performed using either grounded emitter or grounded base configurations The side top and bottom cabinet panels provide protection to personnel from operating potentials present within the instrument In addition they reduce radiation of electromagnetic interference from the instrument The cabinet panels are held in place by screws and four plastic panel retainers To remove the panels remove the four plastic retainers and three additional securing screws at the rear of the instrument Pull each panel back to release the front edge then lift the panels away from the i
115. al Specifications Table 1 17 Installation category and Pollution degree Descriptions Characteristics Description Installation categor Terminals on this product may have different installation category designations The 9 installation categories are Calegory Descriptions CATIII Distribution level mains usually permanently connected Equipment at this level is typically in a fixed industrial location CATII Local level mains wall sockets Equipment at this level includes appliances portable tools and similar products Equipment is usually cord connected CAT Secondary signal level or battery operated circuits of electronic equipment Pollution degree 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 Category Descriptions Pollution Degree 1 No pollution or only dry nonconductive pollution occurs Products in this category are generally encapsulated hermetically sealed or located in clean rooms 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 Pollution Degree 3 C
116. al 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 digits 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 oS 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 9 1 Mechanical Parts List 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
117. and ground lead to the Ground plug 2 Close the Protective Cover and turn the VARIABLE COLLECTOR SUPPLY control 3 EXAMINE the test oscilloscope for rectified waveform to be displayed 4 Change the following 370B setting LEFT RIGHT STANDBY STANDBY 5 EXAMINE the test oscilloscope for no waveform to be displayed A small waveform may be displayed by stray capacitance Examining Internal Operation for RIGHT 6 Move the test lead with banana plug to the RIGHT C Collector and close the Protective Cover 7 EXAMINE the test oscilloscope for no waveform to be displayed A small waveform may be displayed by stray capacitance 8 Change the following 370B setting LEFT RIGHT STANDBY RIGHT 9 EXAMINE the test oscilloscope for rectified waveform to be displayed Examining the Collector for OPEN 10 Change the following 370B setting CONFIGURATION COLLECTOR OPEN VARIABLE COLLECTOR 100 SUPPLY 11 EXAMINE the test oscilloscope for no waveform display A small waveform may be displayed by stray capacitance 5 123 Performance Verification 12 Examining Base Configuration 5 124 Removing the Setup 12 Change the following 370B setting LEFT RIGHT STANDBY STANDBY 13 Disconnect the test lead and probe from the 370B NOTE The characteristics examined in this step are examples of typical instrument operation they are not specifications The following procedure checks operation of the relay
118. ange the following 370B setting LEFT RIGHT STANDBY STANDBY 18 Remove the resistor and the Digital Multimeter NOTE Maximum 370B Step Generetor current is 2 A therefore the 100 mA STEP GENERATOR STEP AMPLITUDE settimg have the same performance requirement Replacing the Store Non Store Jumper 19 Change the following 370B setting POWER OFF 20 Remove the A3 A D Board 21 Move jumper J34 from pins 2 4 to pins 1 2 ZERO position 22 Replace the A3 A D Board and the circuit board retainers across the top of the card cage 23 Change the following 370B setting POWER ON 5 97 Performance Verification F11 Checking Maximum J Opposing Offset Current VOLTAGE Mode Pccification m Maximum opposing offset current is less than 20 mA To Left Collector Patch Cord To Left Base 370B settings Initialize the 370B then set the following controls as indicated DISPLAY VERTICAL CURRENT DIV 5 mA COLLECTOR COLLECTOR SUPPLY AC POLARITY MAX PEAK POWER WATTS 220 STEP GENERATOR Mode VOLTAGE STEP AMPLITUDE 2V NUMBER OF STEPS 0 OFFSET 20 V CURSOR DOT Checking without INVERT 1 Set the LEFT RIGHT STANDBY switch to LEFT 2 CHECK for vertical CURSOR reading of less than 20 mA Removing the Setup 3 Change the following 370B setting LEFT RIGHT STANDBY STANDBY 5 98 370B Service Manual Performance Verification 4 Disconnect the Patch Cord from the 37
119. ase line offset voltage is always applied to the DUT in spite of Step Generator mode and the Measurement Mode setting 1 The A3 A D BoardA3 is pulled out 2 Change J310 on the A3 A D Board Pin 2 3 from Pin 1 2 A V mark is attached to pin 1 of J310 Refer to section of diagram page 8 5 6 Collector Supply Output Circuit Board Remove and replace the 6 Collector Supply Output circuit board as follows 1 Remove the top and left cabinet panels from the main body 2 Remove the electrical shield of the A6 Collector Supply Output circuit board from the main body by removing the four securing screws 3 Remove the connectors for J60 and J62 from the board and remove the connector for J64 from the A19 L V Supply circuit board 4 Remove the four screws that secure the heat sink of the board to the chassis 5 Remove the A6 Collector Supply Output circuit board by removing the two screws from the board 6 Replace the Collector Supply Output circuit board in the reverse order of removal CAUTION If the transistors with heat sink 0438 0440 0538 0540 are N replaced make sure that all four insulation washers on the transistors are placed in position Without these insulators destructive electric short circuits will occur NOTE At the time of replacement no silicone grease application is required because of the high heat conductivity of the insulation washer 370B Service Manual 4 11 Maintenance
120. cal CURSOR readout of 0 00 nA E4 Checking vertical MAG X10 Accuracy Specification m OFFSET with MAG set to X10 is accurate to within 1 5 of the readout 0 3 division of the setting To Left Base To Left Collector 370B settings Initialize the 370B then set the following controls as indicated COLLECTOR SUPPLY POLARITY AC MAX PEAK POWER 220 WATTS MAX X10 On DISPLAY HORIZONTAL 50V COLLECTOR VERTICAL 1mA COLLECTOR STEP GENERATOR Mode CURRENT STEP AMPLITUDE 10mA OFFSET 100mA NUMBER OF STEPS 0 CURSOR DOT 5 58 370B Service Manual Performance Verification 370B Service Manual POSITION Mode LEFT RIGHT STANDBY OUTPUTS Protective Cover Test Equipment setting Digital Multimeter Mode DC DISPLAY LEFT ENABLED Closed Current Checking vertical MAG X10 Accuracy 1 Set the the following 370B setting POSITION Use the down Position control button to set the spot near the vertical cen ter 2 CHECK that the difference between the vertical CURSOR readout and the Digital Multimeter reading is within 1 8 mA Removing the Setup 3 Change the following 370B setting LEFT RIGHT STANDBY STANDBY 4 Remove the digital multimeter leads from the 370B 5 59 Performance Verification E5 Checking EMITTER CURRENT Accuracy and Range in STORE Mode Specifications m STORE mode EMITTER CURRENT DIV settings are accurate to within 1 5 of the readout 0 05 division of
121. cation Test Oscilloscope Vertical Sensitivity 500 mV div DC Horizontal 50 us div Trigger Mode Auto Trigger Slope Checking LONG PULSE Width 1 CHECK that the pulse width is 300 us 10 as measured by the test oscilloscope Checking SHORT PULSE Width 2 Change the following 370B and Test Equipment settings 370B STEP GENERATOR SHORT PULSE Test Equipment settings Test Oscilloscope Horizontal 10 us div 3 CHECK that the pulse width is 80 us 10 370B Service Manual 5 101 Performance Verification 5 102 F14 Examining Step Generator Polarity Operation NOTE The characteristics examined in this step are examples of typical instrument operation they are not specifications 370B settings Initialize the 370B then set the following controls as indicated DISPLAY HORIZONTAL VOLTS DIV 500 mV BASE EMITTER COLLECTOR SUPPLY AC POLARITY STEP GENERATOR Mode VOLTAGE STEP AMPLITUDE 100 mV OFFSET 1000 mV CURSOR DOT OUTPUTS ENABLED Protective Cover Closed Examining POLARITY INVERT Operation 1 Press the POLARITY INVERT button 2 EXAMINE that the red INVERT LED for lights and the green LED in the STEP GENERATOR POLARITY window changes from to and the CRT to see that the displayed waveform changes from right to left from graticule center 3 Press the POLARITY INVERT button to OFF 370B Service Manual Performance Verification 370B Service Manual Examining the CONFIG
122. cking lt HORIZONTAL COLLECTOR Voltage 5 1 121018 Accuracy and The HORIZONTAL COLLECTOR settings are accurate to within 1 5 of STORE Mode the readout 0 05 division of the setting DC Voltage Source To Left Collector 370B settings Initialize the 370B then set the following controls as indicated DISPLAY HORIZONTAL 50 mV COLLECTOR COLLECTOR SUPPLY MAX 400 VOLT DIV PEAK VOLTS CURSOR Mode DOT Protective Cover Closed LEFT RIGHT STANDBY LEFT Test Equipment setting Calibrator Output 0 00 V DC WARNING Extreme caution must used when performing the following step due to the dangerous potentials present at the input of the 370B The protective cover should be installed 370B Service Manual 5 49 Performance Verification 5 50 A Checking Collector Voltage Accuracy 1 CHECK that the horizontal CURSOR readout is within the CURSOR Readout limits for each HORIZONTAL CURRENT VOLTS DIV and DC Voltage setting listed in Table 5 6 There are two DC Voltage values given for each HORIZONTAL VOLTS DIV setting in Table 5 6 Check for both Removing the Setup 2 Change the following 370B setting LEFT RIGHT STANDBY SATNDBY 3 Change the following test equipment setting Calibrator Output 0 00 V WARNING Be certain that the output of the Calibrator is set to zero or Standby before connecting or disconnecting the test leads 4 Disconnect the Calibrator leads from the 3
123. covers the A6 Collector Supply Board These are three shield on the left side remove the rear shield 370B Service Manual Performance Verification 370B Service Manual Adjusting Collector Supply Offset 3 Change the following Test Equipment setting Digital Multimeter Mode DC Voltage 4 Connect the Digital Multimeter test leads to pin 1 and pin 3 of P62 as shown in Figure 5 8 These are the COLLECT OUT and ground pins Digital Multimeter To A6P62 Figure 5 8 Adjusting for Collector Supply Amplifier Offset 5 Change the following 370B setting POWER ON 6 ADJUST CS OFFSET adjustment R412 on the Collector Supply Board for a digital multimeter readout of 0 0 mV 0 1 mV Removing the Setup 7 Change the following 370B setting POWER OFF 8 Remove the digital multimeter test leads from the 370B 9 Replace the electrical shield 10 Change the following 370B setting POWER ON 5 105 Performance Verification G2 Checking MAX PEAK VOLTS Accuracy Adjusting Collector Supply Gain A6R401 5 106 Specification m MAX PEAK VOLTS selection include 16 80 400 and 2000 M MAX PEAK VOLTS accuracy for the COLLECTOR SUPPLY is 15 and 0 for 16 80 400 and 2000 V settings 370B settings Initialize the 370B then set the following control as indicated COLLECTOR SUPPLY MAX PEAK POWER 220 WATTS POLARITY DC CURSOR Mode DOT OUTPUTS ENABLED VARIABLE COLLECTOR 100 SUPPLY
124. ctor Current Range Accuracy Emitter Current Range Accuracy Display Offset Accuracy Display MAG X10 Accuracy Display Invert Accuracy E6b E6b E1 E2 m E1 C2 C4 m NON STORAGE HORIZONTAL DEFLECTION SYSTEM Collector Volts Displayed Noise Base Emitter Volts Input Impedance Displayed Noise Calibrator Voltage Not Specified examined in C1 DIGITAL STORAGE HORIZONTAL ACQUISITION Collector Volts Range Accuracy Base Emitter Volts Range Accuracy Display Offset Range Accuracy Display MAG X10 Accuracy Display Invert Accuracy D1 D1 QO O C2 C3 C4 g ajl O j 370 Service Manual Performance Verification Power Up Sequence A A 370B Service Manual Table 5 2 Performance Check Summary Cont Characteristic Checked Adjusted CRT Cathode Voltage Astigmatism and Focus Intensity Controls Not TET examined in B4 B5 B6 POWER SUPPLY Deviation Not Specified examined in A1 Ripple Not _ examined 1 PLL Reference Voltage The performance of this instrument can be checked at any ambient temperature from 10 C to 40 C unless otherwise stated Adjustment must be made at an ambient temperature from 20 C to 30 C for the specified tolerances to apply WARNING Adjustment of the 370B should only be performed by a qualified service technician 1 Check that the 370B
125. d earth from either pole of the power source must not exceed the maximum rated operating voltage 250 volts rms Before making connection to the power source make sure that the instrument is set for the power source voltage and is equipped with a suitable plug two pole three terminal grounding type 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 grounding contact of the power plug Therefore the power plug must only be inserted in a mating receptacle with a grounding contact Do not defeat the grounding connection Any interruption of the grounding connection can create an electric shock hazard For electric shock protection connect the instrument to ground before connect ing to the instrument input or output terminals International Electrotechnical Commission The 370B can be operated where the ambient air temperature is between 10 C and 40 C After storage at temperatures outside the operating limits allow the chassis temperature to reach the safe operating limits before applying power The 370B is cooled by air drawn in through the air filter on the rear panel and blown out through holes in the side panels For proper instrument cooling provide adequate clearance on the rear and sides of the instrument to ensure free air flow and dissipation of heat away from the instrument WARNING F
126. d signals of the 370B These signals include control signals drive signals data signals reference signals sense signals ground lines and power supply lines The MPU circuitry is located on the A2 CPU board It consists of a 68000 Microprocessor Power Up Reset Circuit Clock Generator Buffers Wait Timing Generator and Interrupt Control Logic Circuit The Memory circuit consists of the ROM RAM Battery Backup address selector and buffers 370B Service Manual Theory of Operation Generator lt 4a gt The Generator Circuit is located on the A3 A D Board NOTE The 370B has two step generator output modes PULSED OFFSE MODE and DC OFFSET MODE The Pulse Offset is the default mode It can be changed to DC OFFSET MODE with the jumper J310 on the A3 A D Board Pulsed Offset will cause additional heat up for the DUT For the Normally On fh CAUTION When the device under test DUT is Normally On type transistor type transistor DC Offset mode should be used CAUTION When the device under test DUT is Normally Off type transistor DC Offset will cause additional heat up for the DUT For the Normally Off type transistor Pulsed Offset mode should be used Pulsed Offset When the measurement mode is set to Single or Sweep and the Step Generator Voltage is set the base line offset is applied only in the internal measurement operation interval Pulsed Offset functions only when Step Generator is PULSE MODE
127. d board to the guard box Remove the A9 L V Relay circuit board by grasping the heat sink and lifting the board Remove the A35 Looping circuit board from the A9 L V Relay circuit board by removing solder for J84 and J85 connectors of the A35 Looping circuit board 370B Service Manual Maintenance 370B Service Manual NOTE The heat sink of the A9 L V Relay circuit board is also used as the current return of the floating ground Therefore secure firmly the two screws securing the heat sink to the guard box when replacing the A9 L V Relay circuit board 7 Replace the A9 L V Relay circuit board and A35 Looping circuit board in the reverse order of removal A10 Sense Circuit Board and A13 Key Interface Circuit Board The A13 Key Interface circuit board is located on the A10 Sense circuit board Remove and replace the A10 Sense circuit board and A13 Key Interface circuit board as follows 1 Pull out the drawer unit from the main body of the 370B 2 Remove the connector for J100 from the A13 Key Interface circuit board 3 Remove the six screws securing the support bracket for the A24 FDD assembly and the A23 FDD Interface circuit board to the chassis 4 Remove the bracket with the A24 FDD assembly and A23 FDD Interface circuit board attached 5 Remove the connector for J142 from the A13 Key Interface circuit board NOTE Steps 6 and 7 are instructions for removal of the A13 Key Interface board Proceed to st
128. disconnect the instrument from the power source before removing or replacing components or sub assem blies The exploded view drawings associated with the Replaceable Mechanical Parts list located at the rear of this manual may be helpful in the removal or disassembly of individual components or sub assemblies Preparations for Component Removal and Replacement Before removing or replacing a component it may be necessary to open or remove panels key boards etc The following is the procedure for these preparations Cabinet Panel Removal 1 The 370B has three cabinet panels top right and left 2 Remove the four cabinet panel retainers from each corner of the 370B rear panel 3 Remove the top cabinet panel by first removing its securing screw at the rear Slide the panel back to remove it 4 Remove the right and left cabinet panels by first removing each securing screw at the rear Pull each panel back slightly to release it from the front casting Then move the top of the panel outward Remove each panel by either sliding it to the rear or by lifting it from the bottom groove in the main body 5 Replace cabinet panels in the reverse order of removal 370B Service Manual Maintenance Rear Panel Removal 1 Remove the four cabinet panel retainers from each corner of the rear panel 2 Remove the top left and right cabinet panels from the main body of the 370B See the Cabinet Panel Removal instructions
129. djustment R554 and Y Gain adjustment R574 on the A5 Display Control Board to position the Dot Pattern s outer eight dots within the inner and outer Frame Patterns Checking and Adjusting Geometry 14 Change the following 370B settings POSITION controls Vertical and Horizontal Position the center dot of the Dot Pattern at graticule center 15 CHECK the Frame Pattern for lt 0 5 minor division of bowing and lt 0 75 minor division of keystone effect If the bowing and keystone effect are not within these limits the following adjustment may be necessary 16 ADJUST Geometry adjustment R410 on the A18 CRT Output Board if necessary for minimum display bowing Examining the Display for Adjustment Interaction 17 EXAMINE the display for all dots to be between the outer frame and inner frame of the Frame Test Pattern within 0 5 minor division If not repeat parts 10 through 14 18 EXAMINE the display for the graticule periphery to be between the outer frame and inner frame of the frame test pattern within 0 5 minor division If not repeat parts 10 through 14 370B Service Manual Performance Verification C5 Checking DISPLAY INVERT Accuracy 370B Service Manual 19 EXAMINE the display for the center dot to be at graticule center within 0 5 minor division Removing the Test Pattern 20 Press the FAST SHIFT button to exit the diagnostic routine Specification m DISPLAY INVERT for Digital Storage V
130. e typical Accuracy Display offset typical Range Accuracy Display x10 MAG typical Accuracy Display Invert typical Accuracy 370B Service Manual Performance Requirement Operating Information Except tor switching noise at QQ and UJ mode 1 nA div to 2 mA div in a 1 2 5 sequence Collector Supply Polarity is either LEAK x10 MAG extends maximum sensitivity to AGE or LEAKAGE mode 100 pA div Within 2 of WINDOW cursor readout 0 1 x VERT DIV settings 1 nA Depending on setting of MAX PEAK VOLTS With STEP MULTI 1 x 10 divisions with 0 1 div resolution Within 1 5 of offset 0 1 x VERT DIV setting Within 1 5 of window cursor readout 0 3 x VERT DIV setting Within 0 1 x VERT DIV setting Specifications Table 1 5 Digital Storage Vertical Acquisition Characteristic A D Converter Resolution Max data points Max sampling rate Min sampling rate Collector Base Current Range Accuracy Emitter Current Range Accuracy Step Generator display Range Accuracy Display offset Range Accuracy Display x10 MAG Accuracy Display Invert Accuracy Performance Requirement Operating Information 10 bits for 10 24 divisions 100 counts per division 1024 Line frequency x 1024 Line frequency x 2 1 uA div to 2 A div a 1 2 5 sequence x10 MAG extends maximum sensitivity to 100 nA div 1 nA resolution Within 1 5 of DOT cursor readout 0 05 x VERT DIV sett
131. e 3 1 370B Block Diagram 370B Service Manual CONFIGURATION RELAY AND CONNECTOR HORIZONTAL SENSE Pus S SENSE RTICAL RESISTOR SENSE L SENSE BOARD INTERFACE NOTE ACQUIRED DATA FLOW POWER OR DRIVE SIGNAL CONTROL SIGNAL lt Bus xz BUS LOCAL GPIB EQUIPMENT Theory of Operation 3 4 Data Acquisition and Display The PLL and Clock Circuit generates a synchronous signal for the Step Generator and the Sine Wave generator This Circuit also generates synchronous signals for the Acquisition Circuits This block consists of the following circuits AUX GEN Circuit STEP GEN Circuit SIN GEN Circuit PLL and CLOCK Circuit AUX SUPPLY Circuit Collector Supply Amp Circuit Step Amp Circuit H V Module Circuit L V Relay Circuit Collector Terminal Circuit These circuits sense acquire and display the effect of the Collector Supply and Step Generator on the DUT The block consists mainly of the Sense Circuit the Acquisition Circuit the Digital Display Circuit and the Display Circuit The Sense Circuit senses and amplifies voltages and currents of each terminal of the DUT This circuit also compensates for errors produced by IR drops between the DUT terminals and the supply The amplifier sensitivity is controllable The Acquisition Circuit converts sensed analog data into digital data that is the fetch and A D convert functions This acquired data is sent to
132. e MEMORY INDEX are OK the code displayed on GRT is OK corresponding to the switch or button manipulated Repair LEDs Repair defective button or switch INDEX counts down Check each 5V line 370B Service Manual Troubleshooting Tree cont 8 13 7 WINDOW CURSOR appears Set WINDOW GURSOR to OFF display mode to NON STORE and push FAST and NON STORE buttons simultaneously 4 Spot appears at lower left corner of CRT NO Check AS DISPLAY CONTROL BOARD Readout appears NO Check Pin 4 of U800 on A5 DISPLAY CONTROL BOARD Push FAST and REF buttons simultaneously CAL FULL DZ signal appears A Spot appears at upper nght corner Check AS DISPLAY CONTROL BOARD Check A4 DIGITAL DISPLAY BOARD Check Pin 14 of U800 on A5 DISPLAY CONTROL BOARD STATUS 0 for 7 5ms square wave and Pin 13 of U800 STATUS 1 for 15ns square wave Set display mode to STORE push FAST and NON STORE buttons simultaneously CAL ZERO then push FAST and REF buttons simultaneously CAL FULL gt CAL ZERO and CAL FULL OK Check step signals Rx Ry 8 step 8 mV step appears at Pin 5 of U500 and U520 on A5 DISPLAY CONTROL BOARD 4 STATUS 0 and STATUS 1 are OK gt Check AS DISPLAY CONTROL BOARD Step signals appear Check A3 A D BOARD 8 14 Troubleshooting Tr
133. e Manual Maintenance 370B Service Manual and J95 on the A34 LOR Relay circuit board Remove the screw securing the wire to J1 on the Input Relay module 3 Remove the nut holding the guard box wire lug 4 Remove the Series Resistor module by removing the four screws securing the module to the guard box chassis 5 Replace the Series Resistor module in the reverse order of removal NOTE See the label on the Series Resistor module showing the destination of each wire and connector Input Relay Module Remove and replace the Input Relay module as follows 1 Perform parts 1 through 4 of the removal instructions for the A10 Sense circuit board 2 Remove the three screws securing the wires to J1 J3 and J4 on the Input Relay module 3 Remove the Input Relay module and the shield by removing the four screws 4 Replace the Input Relay module in the reverse order of removal NOTE See the label on the Input Relay module showing the destination of each wire and connector Cooling Fan Remove and replace the Cooling Fan B100 as follows 1 Remove the rear panel See the Rear Panel Removal instructions 2 Remove the protective cover and remove the connector for J272 from the A27 Primary Circuit board 3 Remove the Cooling Fan together with the fan cover filter and fan guard by removing four screws and nuts NOTE Before reinstalling the cooling fan be certain that the J272 wires are at the bott
134. e connectors for J270 J272 and J274 from the board NOTE Removal of connector J272 may be difficult with the plastic insulation cover installed over the board The upper corner of the cover may keep one of the connector 5 latches from releasing Remove the cover first if this problem Occurs 3 Remove the plastic insulation cover and the A27 Primary circuit board by removing the four securing screws from the board 4 Replace the A27 Primary circuit board in the reverse order of removal A28 A29 Graticule Illumination Lamp Circuit Board Remove and replace A28 and A29 Graticule Illumination Lamp circuit boards as follows 1 Remove the CRT bezel cover from the lower side of the CRT bezel by pulling it off with your fingernail Remove the CRT bezel from the front panel by removing the two screws located on the lower side of the bezel 2 Remove the blue CRT filter the CRT spacer and the CRT implosion shield from the CRT frame 370B Service Manual Maintenance 370B Service Manual Remove the CRT frame by first removing the four round head screws from the inner sides of the frame Then remove the four flat head screws from the outer sides of the CRT frame Remove the top cabinet panel Remove connector s J280 and or J290 from the A19 L V Supply circuit board Remove the internal scale illumination light reflector the light reflector retainer and the retainer spring by pulling them out from alongside the
135. e in STORE waveform brightness when the NON STORE STORE VIEW INTENSITY control is turned from fully counterclockwise to fully clockwise Examining VIEW Intensity 7 Change the following 370B setting DISPLAY Mode VIEW 8 EXAMINE the CRT for a continuous increase in VIEW waveform bright ness when the NON STORE STORE VIEW INTENSITY control is turned from fully counterclockwise to fully clockwise 370B Service Manual 5 23 Performance Verification B5 Examining REF NOTE The characteristics examined in this step are examples of typical INTENSITY Operation instrument operation they are not specifications 370B settings Initialize 370B 1 Press the REF button 2 Change the following 370B setting DISPLAY INVERT ON 3 EXAMINE the CRT for a continuous increase in brightness of the viewed trace as the REF INTENSITY control is turned from full counterclockwise to fully clockwise 5 24 370B Service Manual Performance Verification B6 Examining NOTE The characteristics examined in this step are examples of typical READOUT CURSOR instrument operation they are not specifications INTENSITY Operation 370B settings Initialize the 370B then set the following control as indicated CURSOR Mode WINDOW 1 EXAMINE the display for a continuous increase in readout and cursor brightness as the READOUT CURSOR INTENSITY control is turned from fully counterclockwise to fully clockwise 2 Change the
136. ed on transistors use a solder removing wick to remove the solder from the circuit board pads An extracting tool should be used to remove the in line integrated circuits to prevent damaging the pins This tool is available from Tektronix Inc order Tektronix part 003 0619 00 If an extracting tool is not available use care to avoid damaging the pins Pull slowly and evenly on both ends of the integrated circuit Try to avoid disengag ing one end from the socket before the other 370B Service Manual Maintenance Adjustment After Repair Diagnostic Routines 370B Service Manual After any electrical component has been replaced the adjustment of that particular circuit should be checked as well as the adjustment of any closely related circuits The 370B has four diagnostic routines Two Power on Diagnostic routines a User Initiated Diagnostic routine and GPIB diagnostic routine Power On Diagnostic Routines At power on the 370B runs the Power On Diagnostic routine to execute the following tests Boot ROM check System RAM check Display RAM check Acquisition RAM check Push button test After completion of Power on Diagnostic routines the 370B displays a SELFTEST PASS message at the error message area of the CRT and sets the initial settings If the 370B is turned on with the FAST SHIFT key pressed a more detailed Power On Diagnostic routine is made in the following order Boot ROM check System RAM check
137. ee cont 370B Service Manual Push FAST and STORE buttons simultaneously Check collector supply Close protective cover Set LEFT RIGHT and tum VARIABLE _ Voltage at LEFT output voltage at Pin 1 of COLLECTOR SUPPLY COLLECTOR J62 on A6 COLLECTOR to 100 n TERMINAL OK SUPPLY OUTPUT BOARD Check TP250 on 10 Make a short circuit Check full wave rectified SENSE BOARD between LEFT positive sine wave appears COLLECTOR and LEFT at TP460 on A10 SENSE EMITTER TERMINALS BOARD then set LEFT RIGHT STANDBY switch to LEFT gt Check 10 SENSE BOARD Voltage is OK gt Signal at Check A10 SENSE TP460 is BOARD OK gt Collector current flows whenVERTICAL switch is at Check A3 A D BOARD appropriate Check AS DISPLAY CONTROL BOARD gt Signal at Check A10 SENSE TP250 is BOARD OK Check A5 DISPLAY CONTROL BOARD 370B Service Manual Collector supply 5 Collector signal at TP580 on A3 Troubleshooting Tree cont 8 15 Check Pin of AG U400 for 6 5V Pin 4 of AG U400 for 6 5V Pin 16 of AG U400 for 5V and cathode of A20 CR446 for 12V Set PEAK VOLTS switch to 2000V Check for DC half 2 wave rectified positive sine HORIZONTAL switch to 5 70 V peal and VDD Check 92 Terminal cut 100V DIV and MAX PEAK Check COL SIG at L306 o
138. en 3 second and 80 second for 2 025 A of Collector Transformer primary current 135 rating of circuit breaker NOTE The collector supply is limited to a maximum continuous peak current operating time under the following duty cycle and ambient temperature conditions 50 W Maximum continuous operating time at rated current 100 duty cycle into a short circuit is 20 minutes at 25 C ambient or 10 minutes at 40 C ambient 220W Maximum continuous operating time at rated current 100 duty cycle into a short circuit is 3 minutes at 25 C ambient or 90 seconds at 40 C ambient Alternatively the duty cycle may be limited to 50 at 25 ambient or 25 at 40 C ambient A normal family of transistor curves will produce a duty cycle effect to 50 or less even if operated continuously Collector Supply over dissipation temporarily shuts off the power and prints a message on the screen Collector Supply over current trips the OUTPUTS breaker prints a message on the screen and reset the Collector Supply output to 0 No damage results when over dissipation occurs 1 6 370B Service Manual Specifications Table 1 2 Step Generator Characteristic Accuracy Incremental Absolute Offset control range Resolution Step transition timing typical Current mode Amplitude range Maximum current Maximum voltage Performance Requirement Operating Information Current or Voltage Steps including Offset 1 5 Less
139. ense lt 14 gt Horizontal Sense lt 15a gt Low Key Interface lt 15b gt Front Panel Key Interface lt 16 gt consists of the Control Signal Latches Relay Drivers 0 5 1 2 Ranging Circuit and Step Amplifier This circuit also includes the Auxiliary Supply Circuit This circuit consists of Transformer H V Module Relay Control Signal Decoder Circuit and LOR Relay Circuit and is active when the MAX PEAK VOLTS is set to 2000 These circuits provide the sine wave ac the full wave rectified sine wave and the DC voltage that range from 0 volts to 2000 volts peak These voltages are applied to the collector of the device under test via the A34 LOR Relay board This circuit is located on the A9 L V Relay board and the A35 Looping board The circuit consists of Transformer Full wave Rectifier Circuit Smoothing Circuit Output Power Limiter Circuit Looping Compensator Circuit Relay Control Signal Decoder Circuit Relay Circuit and Discharging Circuit These circuits provide the sine wave ac the full wave rectified sine wave and the DC voltages These voltages are supplied in three ranges from 0 volts to 16 volts from 0 volts to 80 volts and from 0 volts to 400 volts These voltages are applied to the collector or base of the device under test via the A34 LOR Relay board the A10 Sense board and the A33 Configuration Relay Board This circuit is located on the A10 Sense board and consists of the Sense Board Interlock Circuit the In
140. ep 8 if you don t need to remove this board 6 Remove the two screws from the A13 Key Interface circuit board NOTE The A10 Sense circuit board and A13 Key Interface circuit board are connected to one another by circuit board mounted connectors J130 and P130 Be careful not to damage the connector when removing and replacing the board 7 Pull up the A13 Key Interface circuit board to disconnect the interface connection between the A10 Sense circuit board and A13 Key Interface circuit board releasing the two board retaining latches with a pair of pliers 8 Remove the connectors for J414 J415 J416 J417 and J418 from the A10 Sense circuit board 9 Remove the P411 connector with cable assembly by removing the two screws securing the P411 connector to the drawer unit 4 13 Maintenance NOTE When removing connectors from a board tag each one to prevent misconnection while reassembling 10 Remove the connectors for J90 J104 J140 J301 J302 J330 and J419 from the A10 Sense circuit board and remove the connector for P160 from the A9 L V Relay circuit board 11 Remove the screw holding the guard box wire lug which is located to the front in the guard box to the guard box chassis 12 Remove the two flat head screws securing the heat sink of the A10 Sense circuit board to the right side of the drawer unit 13 Remove the six screws from the A10 Sense circuit board 14 Remove the 10 Sense circui
141. epeat steps 3 through 7 Examining 2000 V LOOPING 10 Change the following 370B settings DISPLAY HORIZONTAL VOLTS DIV 200 V COLLECTOR COLLECTOR SUPPLY 2000 V MAX PEAK VOLTS VARIABLE COLLECTOR 100 96 SUPPLY LOOPING COMPENSATION Minimum trace width 5 39 Performance Verification 11 EXAMINE the left end of the displayed trace for optimum overlay of the loop and the right side to run parallel with the horizontal graticule lines If the overlay is not optimum and the trace does not parallel the horizontal graticule lines the following adjustment is necessary Adjusting 2000 V LOOPING 12 ADJUST R503 2000 V LOOPING adjustment on the A35 Looping board for optimum overlay of the left portion of the loop See Figure 5 2 et z S Bi w g Es Incorrect Figure 5 2 Looping compensation display A cutout in the left side of the guard box provides adjustment access 370B Service Manual Performance Verification Adjusting LOOP BALANCE 13 ADJUST R500 LOOP BALANCE on the A35 Looping board to align the display with the horizontal graticule line using the LOOPING COM PENSATION control If necessary repeat steps 12 and 13 Adjusting TAN DELTA 14 Change the following 370B setting COLLECTOR SUPPLY MAX PEAK POWER 50 W WATTS 15 ADJUST TAN DELTA R139 on the
142. er Dot Cursor Generator Character amp Latch Controller These circuits determine whether the CPU accesses the Display RAM or whether the Display Counter reads out the Display RAM contents to control signals for the digital display 370B Service Manual Theory of Operation Display D A Converter Circuit lt 7 gt Display Offset Circuit lt 8 gt Display Select lt 9 gt Collector Supply Amplifier lt 10 gt Step Amplifier lt 11 gt 370B Service Manual The Display D A Converter Circuit is located on A4 Digital Display Board The Display D A Converter Circuit consists of X data amp Attribute Prefetch Latch X Y Data amp Attribute Load Latch X 10 bit DAC amp Y 10 bit DAC X amp Y Low pass Filter Font Latch Character ROM amp Shift Register X amp Y Readout Position Latch Readout Attribute Latch 8 bit Adder X Readout Step Generator X Readout DAC and Y Readout DAC These circuits convert the digitized waveform data readout data and cursor data from the Display RAM into an analog signal and generate the z axis signal The Display Offset Circuit is located on the A5 Display Control Board The Display Offset Circuit consists of the Control Logic Circuit Offset D A Converter Polarity Select Circuit Source Select Circuit Zero amp Invert Select Circuit and Gain Select Circuit These circuits select the horizontal and vertical source inputs for the CRT display and provide them with calibrated offset voltag
143. eration Release these latches when disconnecting them Be sure to properly orient each connector when reconnecting it CAUTION Some connectors are symmetrical These are indexed by a mark that denotes pin 1 Drawer Unit Removal 1 2 Remove the right and left cabinet panels from the main body Remove the eight screws four flat head and four round head from each of the mounting brackets that secure the drawer unit to the main body Remove both the right and left mounting brackets Pull the drawer unit forward away from the 370B Replace the drawer unit in the reverse order of removal NOTE Before replacing the left or right mounting bracket make certain that the label on one access hole is properly aligned with the internal potentiometers The brackets are interchangeable and could be installed on the wrong side 370B Service Manual Maintenance 370B Service Manual Cathode Ray Tube Removal NOTE Before removing the CRT be certain that removal is necessary by checking associated circuits Remove the Cathode Ray Tube CRT as follows WARNING The CRT may retain a dangerous electrical charge Before removing the CRT the anode must be fully discharged by shorting the CRT anode to the chassis Wait approximately ten minutes and again firmly short the anode to the chassis then remove the CRT Use extreme care when handling a CRT Breakage of the CRT causes a high velocity scattering of
144. erelays are making sound when MAX 5 PEAK POWER WATTS v switchposition and VOLT switch position are OK are changed Check A10 SENSE BOARD 24 Full wave rectified positive sine wave YES NO Check full waverestified positive sine wave 2000V appears at J1 on U300 INPUT RELAY MODULE Check U800 HV RELAY MODULE Check A34 L O R RELAY BOARD Troubleshooting Tree cont 5 Check ARG signal at Pin 10 of e P32 on A3 A D is TTL H ARG signal COLLECTOR level is OK PEAK VILTS Check A3 A D BOARD Check A13 KEY Check A10 SENSE BOARD INTERFACE BOARD 8 20 Troubleshooting Tree cont 370B Service Manual Mechanical Parts List _ SS HEN Mechanical Parts List This section contains a list of the replaceable modules for the 370B Use this list to identify and order replacement parts Parts Ordering Information Part Number Revision 370B Service Manual Level Replacement parts are available through your local Tektronix field office or representative Changes to Tektronix instruments are sometimes made to accommodate improved components as they become available and to give you the benefit of the latest circuit improvements Therefore when ordering parts it is important to include the following information in your order m Part number see Part number Revision Level below Instrument type or model number m Instrument seri
145. erformance Check and Adjustment Procedure Options 5 2 Table 5 2 Performance Check Summary 5 4 Table 5 3 Test Equipment 5 10 Table 5 4 Voltage Regulation and Ripple 5 13 Table 5 5 Base Emitter Voltage Accuracy 5 48 Table 5 6 Collector Voltage Accuracy 5 50 Table 5 7 Displayed Horizontal Noise 5 53 Table 5 8 Emitter Current Accuracy 5 61 Table 5 9 Collector Current Accuracy 5 63 Table 5 10 Collector High Current Accuracy 5 67 370B Service Manual Table of Contents 370B Service Manual Table 5 11 Displayed Vertical Collector Noise in CONFIGURATION BASE to COLLECTOR SUPPLY mode 5 70 Table 5 12 OFFSET Voltage 5 79 Table 5 13 OFFSET Voltage 5 80 Table 5 14 OFFSET Current 5 82 Table 5 15 Max Peak Volts 5 108 Table 5 16 Max Peak Volts 5 109 Table 5 17 Maximum Peak Currents 5 111 Table 5 18 Auxiliary Supply Accuracy 5 120 Table 6 1 Standard accessories 6 2 Table 6 2 Optional accessories 6 2 Table 6 3 Recommended accessories
146. erformance every 2000 hours of operation or annually if used infrequently NOTE The Performance Check and Adjustment Procedure is a multipurpose procedure Time can be saved by performing only those steps necessary for your application Carefully read Table 5 1 to select the appropriate procedure option for the task to be performed 5 1 Performance Verification Table 5 1 Performance Check and Adjustment Procedure Options Task Performance Check Checking key electrical specifica tions Adjustment Performance Check and Adjustment Partial Performance Check or Adjustment Functional Check of Front Panel Controls and Connectors Complete Functional Check Procedure Options Perform the Power Up Sequence at the beginning of the Performance Check and Adjustment Procedure Perform those steps with titles beginning with Checking and identified with a in the bar above the heading see the Procedure Index at the beginning of the procedure NOTE If a Checking step also contains the word Adjusting in the title and a 7 in the bar above the title ignore those parts of the step with adjustment instructions Perform the Power Up Sequence at the beginning of the Performance Check and Adjustment Procedure Perform only those steps with Adjusting in the title and a T in the bar above the title see the Procedure Index at the beginning of the procedure NOTE Perform all parts of these adjustment
147. ertical and Horizontal acquisition is accurate to within 0 04 of VERT DIV or HORIZ DIV setting 370B settings Initialize the 370B then set the following controls as indicated DISPLAY Mode CAL ZERO CURSOR Mode DOT CAL ZERO is initiated by pressing the NON STORE button while holding down the FAST SHIFT button 1 Change the following 370B setting DISPLAY INVERT ON 2 The indicator above the INVERT button will light 3 Check that the spot moves from lower left corner to the upper right corner of the graticule and the vertical CURSOR readout and horizontal CURSOR readout are 0 00 0 08 5 35 Performance Verification C6 Checking Display Offset Accuracy 5 36 Dd Specifications m For Digital Storage Vertical and Horizontal Acquisition the center line display can be vertically and horizontally offset up to ten divisions in 0 1 division steps m Display Offset is accurate to within 1 5 of the offset in divisions 0 01 division of the setting 370B settings Initialize the 370B then set the following controls as indicated DISPLAY Mode CAL ZERO CURSOR Mode DOT POSITION Mode DISPLAY Hold down the FAST SHIFT button and press the NON STORE button to enter the CAL ZERO mode 370B Service Manual Performance Verification Checking Positive Offset 1 EXAMINE the display as the right Position Control button is pressed for the spot to move continuously from lower left cor
148. es to execute display functions such as DISPLAY OFFSET MAG CRT CAL DISPLAY INVERT and COLLECTOR SUPPLY POLARITY The Display Select circuit is located on the A5 Display Control board The circuit consists of the Signal Select Logic Circuit Unblank amp Z Select Circuit and the Horizontal amp Vertical Preamp This circuit block selects and amplifies the source inputs that are displayed on the CRT Selection of the source inputs are performed by the Signal Select Logic Circuit The Z signal for the source inputs is controlled by the Un blank amp Z Select Circuit This circuit is located on the Collector Supply board and the A19 L V Supply board The circuit consists of the Collector Supply Amplifier Circuit the Voltage Limiter Circuit the Current Limiter Circuit the Limit Detector Circuit the Power Supply and Control Circuit and the Control Signal Decoder Circuit These circuits amplify signals from the Sine Wave Generator located on the A3 A D board and provide driving voltage for collector supply transformer The Step Amplifier circuits are located on the A7 Step Generator board This circuit transforms the output of the Step Generator on the A D Board into current or voltage steps of various amplitudes to be applied to the device under test The STEP AMPLITUDE switch determines the amplitude of the steps The circuit 3 9 Theory of Operation H V Module lt 12 gt Collector Supply Low Voltage lt 13 gt Vertical S
149. et Width 429 mm 16 9 in Depth 635 mm 25 0 in 370B Service Manual 1 17 Specifications Functional Specifications Table 1 13 Digital Storage Acquisition Mode Performance Requirement Operating Information Acquires and displayed each curve Acquires and displays the maximum and minimum vertical excursion of each curve Acquires and displays the maximum and minimum horizontal excursion of each curve Acquires and displays the average of last 16 acquisitions Characteristic Normal Envelope Vertical Envelope Horizontal Envelope Averaging Table 1 14 Text Display Characteristic Alphanumeric character Set 1 Alphanumeric character Set 2 Maximum text string length Character size GPIB accessible with the TEXT command A B Y Z Space m u Accessible with the Position Control buttons 24 characters Approximately 3 mm height 2 mm width Performance Requirement Operating Information ASCII character set except double quote 7 u is recognized as u 370B Service Manual Specifications Environmental Specifications Table 1 15 Environmental Specification Characteristic Performance Requirement Temperature Operating Nom Operating Transportation Temperature gradient Operating Non operating Humidity Operating and Non operating Relative Humidity Operating Storage Transportation Altitude Operating Non Operating Vibration Operating Shock non operating Be
150. ether the center cross mark of the Frame Test Pattern aligns with the center dot of the Dot Pattern If the pattern centers do not align the following adjustments are necessary Adjusting SY Position and SX Position The SX and SY Position controls change the Frame Test Pattern position without affecting the Dot Test Pattern position 6 ADJUST SY Position adjustment R528 and SX Position adjustment R508 on the A5 Display Control Board so that the center cross mark of the Frame Test Pattern conforms to the center dot of the Dot Pattern not the center of the graticule 5 32 370B Service Manual Performance Verification Examining and Adjusting D A Gain 7 EXAMINE the display to determine whether the outer eight dots of the Dot Pattern are located between the inner frame and outer frame of the Frame Test Pattern If the location is not correct the following adjustment is necessary 8 ADJUST D A Gain adjustment R842 on the A4 Digital Display Board to position the outer eight dots between the inner frame and outer frame of the Frame Test Pattern D A Gain adjusts the size of the Frame Test Pattern without changing the Dot Test Pattern size Checking and Adjusting the Display The Dot and Frame Test Pattern are visual aids for display alignment Positioning straightening and sizing of the display involves several adjustments Three of these adjustment GEOMETRY TRACE ROTATION and ORTHOGONALITY are interactive m GEOMETRY
151. f Step F8 before proceeding with this step Digital Multimeter To Left Base 370B settings Initialize the 370B then set the following controls as indicated DISPLAY Mode NON STORE HORIZONTAL VOLTS DIV STEP GEN COLLECTOR SUPPLY DC POLARITY STEP GENERATOR Mode VOLTAGE STEP AMPLITUDE 2V NUMBER OF STEPS 10 OFFSET 20 V POSITION DISPLAY LEFT RIGHT STANDBY LEFT 5 91 Performance Verification 5 92 OUTPUTS ENABLED Protective Cover Closed Test Equipment Settings Digital Multimeter Mode DC Voltage Checking Maximum Voltage 1 Simultaneously press the FAST SHIFT and left Position Control buttons to move the displayed spot to the left most graticule line 2 Change the following 370B setting MEASUREMENT Press the REPEAT button several times to move the displayed spot to the right most graticule line The Digital Multimeter reading should be approximately 40 V 3 Check that the digital multimeter reading is between 39 34 and 40 66 V Checking INVERT 4 Press the STEP GENERATOR INVERT button to On Step Generator output should be automatically return to Step 0 5 Simultaneously press the FAST SHIFT and right Position Control buttons to move the displayed spot to the right most graticule line 6 Change the following 370B settings MEASUREMENT Press the REPEAT button several times to move the displayed spot to the left most graticule line The Digital Multimeter reading should be approximately 40
152. f the exact item of equipment given as an example in Table 5 3 is not available first check the Minimum Specifications column carefully to see if any other equipment might suffice Then check the Purpose column to see where this item is used If used for a performance check or adjustment that is of little or no importance for your measurement require ments the item and corresponding step s can be deleted 370B Service Manual 5 9 Performance Verification Table 5 3 Test Equipment Item 1 Test Oscilloscope 2 Calibrator Voltage range 500 0 mV to 1000 V Accuracy 0 1 mV Resolution 0 1 mV Current range 10 00 uA to 1 999 A Accuracy 0 196 4 5 digit DCV 1000 V Accura cy 0 05 Resolution 0 1 mV Input imp 10 000 MQ 100 mV 1 V 10 V range DCA 1 28 Accuracy 0 1 nA 2 25 Accuracy 0 05 Resolution 0 01 4 5 digit DCV 1000 V Accura cy 0 05 Resolution 0 1 mV Input Imp 10 M amp 2 20 V range Combination hex wrench and screwdriver tips for electronics use 3 Digital Multimeter 4 Tool Alignment 5 Banana Plugs 6 Screw Driver 7 Patch Cord 8 High Voltage Probe 9 Test Lead 10 Resistors 25 MQ 0 1 1 2 W 2 5 MQ 0 1 1 2 W 250 0 1 1 2 W 1 MQ 5 1 4 W 10 MQ 5 1 4 W 100 9 5 1 4 W 0 025 Q 0 1 4 W Minimum Specification Bandwidth DC to 150 MHz deflection factor 2 mV to 5 Vidiv with 10X 10 MQ probe Used to check ripple
153. f 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 digits 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 Electrical Parts List 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 Using the Replaceable Electrical Parts List The tabular information in the Replaceable Electrical Parts List is arranged for quick retrieval Understanding the structure and features of the list will help you find all of the information you need for ordering replacement parts The following table describes each column of the electrical parts list Parts List Column Descriptions Column Column Name Description 1 Component Number The component number appears on diagrams and circuit board illustrations located in the diagrams section Assembly numbers are clearly marked on each diagram and circuit board illustra
154. following 370B setting INTENSITY READOUT CURSOR Normal viewing level 370B Service Manual 5 25 Performance Verification Display Equipment Required see Table 5 3 m Digital Multimeter C1 Examining Calibrator NOTE The characteristics examined in this step are examples of typical Voltage instrument operation they are not specifications To 5 658 Digital Multimeter 370B settings Initialize the 370B Test Equipment settings Digital Multimeter Mode DC Voltage Examining Horizontal CAL ZERO 1 Change the following 370B setting DISPLAY Mode CAL ZERO CAL ZERO is initiated by pressing the NON STORE button while holding down the FAST SHIFT button 5 26 370B Service Manual Performance Verification 2 EXAMINE the digital multimeter for a reading between 0 995 V and 1 005 V Examining Horizontal CAL FULL 3 Change the following 370B setting DISPLAY Mode CAL FULL CAL FULL is initiated by pressing the REF button while holding down the FAST SHIFT button 4 EXAMINE the digital multimeter for a reading between 0 995 V and 1 005 V 5 Disconnect the digital multimeter positive lead from TP658 Examining Vertical CAL FULL 6 Connect the digital multimeter positive lead to TP648 on the A5 Display Control Board 7 EXAMINE the digital multimeter for a reading between 0 995 V and 1 005 V Examining Vertical CAL ZERO 8 Change the following 370B setting DISPLAY Mode CA
155. following the First Time Operation in the 370B Programmable Curve Tracer User Manual This instrument operates from a power source having a neutral or near ground earth potential It is not intended for operation from two phases of a multi phase system nor across legs of a single phase three wire system This instrument can be operated from either a 115 volt or 230 volt nominal supply source 48 to 63 Hz Table 2 1 is a listing of the line voltage ranges line frequency range and power consumption Table 2 1 Line voltage ranges RANGE switch NORMAL switch 115 VAC 107 VAC to 132 VAC 214 VAC to 250 VAC 180 VAC to 220 VAC Power consumption Max 400 W 3 5 A at 132 V 60 Hz Typical 120 W 1 3 A at 115 V 50 Hz 2 1 Getting Started Operating Voltage Selection and Line Fuse Verification Power Cord Information 2 2 The LINE VOLTAGE SELECTOR switches NOMINAL and RANGE located on the rear panel allow selection of the operating line voltage To select the correct operating line voltage 1 Disconnect the 370B from the AC power source before changing the operating voltage 2 Select the nominal AC power source voltage with the NOMINAL switch and 3 Select the operating line voltage with the RANGE switch CAUTION To prevent damage to the instrument always check the settings of the LINE VOLTAGE SELECTOR switches located on the rear panel of the 370B before connecting the instrument to the line
156. from the main body of the 370B Remove the protective box from the Test Adapters Remove the four flat head screws securing the Test Adapter Mounting Plate assembly to the center front of the drawer unit Remove the two flat head screws securing the left front panel assembly to the left front side of the drawer unit Remove the left front panel assembly by lifting it out Remove the connectors for J200 and J210 from the board Remove the connector for J150 from the A9 L V Relay circuit board Remove the 15 Configuration LED circuit board by removing the two nuts securing the board Replace the A15 Configuration LED circuit board in the reverse order of removal 18 CRT Output Circuit Board Remove and replace the 18 CRT Output circuit board as follows 1 2 Remove the top cabinet panel from the main body of the 370B Remove the plastic insulator by removing its four securing screws from the A18 CRT Output circuit board Remove the connectors for J180 J182 J184 and J186 from the board Remove the A18 CRT Output circuit board by removing the four spacer posts from the board Replace the 18 CRT Output circuit board in the reverse order of removal A19 L V Supply Circuit Board Remove and replace the 19 L V Supply Circuit board as follows 1 2 Remove the top left and right cabinet panels from the main body Remove the rear panel See the Rear Panel Removal instructions NOTE When removing
157. g 1 mV Digital Multimeter To Left Base 370B settings Initialize the 370B then set the following controls as indicated 370B Service Manual Performance Verification 370B Service Manual DISPLAY HORIZONTAL 5 V BASE EMITTER STEP GENERATOR Mode Voltage STEP AMPLITUDE 2V OFFSET 0 0 mV NUMBER OF STEPS 0 COLLECTOR SUPPLY AC POLARITY LEFT RIGHT STANDBY LEFT OUTPUTS ENABLED Protective Cover Closed Test Equipment Settings Digital Multimeter Mode DC Voltage Checking Zero OFFSET without INVERT 1 CHECK that it is within the range of 0 0 61 that digital multimeter measurement is limit value Checking Maximum OFFSET without INVERT 2 Change the following 370B setting STEP GENERATOR STEP AMPLITUDE 200 mV OFFSET AID 2V CHECK that the digital multimeter measurement is within the limits shown in Table 5 12 under Maximum OFFSET for each setting of the STEP AMPLITUDE control Table 5 12 OFFSET Voltage STEP AMPLITUDE Digital Multimeter Reading Max OFFSET 200 mV 1963 mV to 2037 mV 2V 19 64 V to 20 36 V 5 79 Performance Verification Checking Maximum OFFSET with INVERT 4 Change the following 370B settings STEP GENERATOR POLARITY INVERT ON 3 8 The indicator above the INVERT button will light up 5 CHECK that the Digital Multimeter measurement is within the limits shown in Table 5 13 under Maximum OFFSET for each setting of the STEP AMPLITUDE cont
158. grated 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 TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY 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 SS Table of Contents Specifications Operating Information Theory of Operation Maintenance General Safety Summary Vii Service Safety Summary ix luc tes xi Introduction iiv ede ee Sr ehe RUNG xv Product Overview 1 1 Specifications 4 2 yl e er es rer 1 3 Performance Conditions 1 3 Electrical Specifications 1 1 4 Mechanical 1 17 Functional Specifications 1 18 Environmental S
159. hanical Parts List Replaceable mechanical parts list Cont Fig amp index Tektronix part Serialno Serial no Mfr number number effective discontd Qty amp description code Mfr part number 29 212 0002 XX 4 SCREW MACHINE 8 32 X 0 25 FLH 100 DEG STL 0 01 ORDER BY DESC 30 212 0004 XX 4 SCREW MACHINE 8 32 X 0 312 PNH STL TK0435 ORDER BY DESC END ATTACHING PARTS 31 334 7747 XX 1 MARKER IDENT 80009 3347747 32 426 2211 XX 1 FRAME SECTION BOTTOM LEFT 0191 ORDER BY DESC ATTACHING PARTS 33 211 0559 XX 2 SCREW MACHINE 6 32 X 0 375 FLH STL TK0435 1593 300 END ATTACHING PARTS 34 124 0448 XX 2 STRIP TRIM BOTTOM 80009 1240448 35 348 0128 XX 4 FOOT CABINET BLACK POLYURETHANE 80009 3480128 ATTACHING PARTS 36 211 0513 XX 8 SCREW MACHINE 6 32 X 0 625 PNH STL 0435 ORDER BY DESC END ATTACHING PARTS 37 426 2134 XX 1 FRAME SECTION FRONT LEFT 0191 4262134XX ATTACHING PARTS 38 211 0538 XX 2 SCREW MACHINE 6 32 X 0 312 FLH STL TK0435 ORDER BY DESC END ATTACHING PARTS 39 426 2138 XX 1 FRAME SECTION BOTTOM RIGHT 0191 4262138XX ATTACHING PARTS 40 211 0559 XX 2 SCREW MACHINE 6 32 X 0 375 FLH STL TK0435 1593 300 END ATTACHING PARTS 41 334 3379 1 MARKER IDENT MARKED GROUND SYMBOL 07416 ORDER BY DESC 42 426 2135 XX 1 FRAME SECTION FRONT RIGHT 0191 4262135 ATTACHING PARTS 43 211 0538 XX 2 SCREW MACHINE 6 32 X 0 312 FLH STL TK0435 ORDER BY DESC END ATTACHING PARTS 44 351
160. has been set for the proper power source and that a suitable power cord has been attached 2 Remove the 370B cabinet panels to gain access to internal adjustment and test points For instructions on cabinet panel removal refer to the description under the heading COMPONENT REMOVAL AND REPLACEMENT in Section 4 of this manual WARNING Use extreme care when operating the 370B with the covers removed due to the line voltage high voltage and high current levels present 3 Connect the 370B to a suitable power source 5 7 Performance Verification 5 8 Initializing the 370B 4 Press the POWER button and allow at least 20 minutes warmup before proceeding The following procedure saves the power up default 370B settings for use when the procedure calls for you to Initialize the 370B 1 Press the SETUP SAVE button to store the default settings in memory location 1 These default settings plus the manual initialization settings are used as starting settings throughout this procedure expect as noted otherwise 2 Now to Initialize the 370B a Press the SETUP RECALL button with the MEMORY index set to location 1 b Make the additional manual settings OUTPUTS Protective Cover ENABLED Closed The power up default settings are as follows DISPLAY Mode VERTICAL HORIZONTAL INVERT COLLECTOR SUPPLY MAX PEAK VOLTS MAX PEAK POWER WATTS POLARITY STEP GENERATOR Mode STEP AMPLITUDE NUMBE
161. hassis Circuit Boards 9 17 370B Service Manual Sas DS pl x 2 77 5 os SS UM gt 370B Service Manual Figure 9 4 Power Supply 9 18 Mechanical Parts List Replaceable mechanical parts list Fig amp index number 4 1 20 21 22 23 24 25 370B Service Manual Tektronix part number 670 9308 06 211 0507 XX 211 0661 XX 151 1201 00 151 1202 00 211 0315 XX 342 0787 XX 174 0304 00 260 2332 01 211 0661 XX 174 0301 00 131 3672 00 131 0608 00 131 0589 00 407 3470 XX 343 1084 337 3330 211 0008 334 6695 407 3478 212 0507 407 3907 212 0507 214 3974 211 0538 120 1678 01 Serial no effective 3801393 3801393 301393 Serial no discont d 302394 302394 302394 Qty Name amp description 1 BOARD ASSY COLL SPLY OUT A6 ATTACHING PARTS SCREW MACHINE 6 32 X 0 312 PNH STL SCR ASSEM WSHR 4 40 X 0 25 PNH STL END ATTACHING PARTS CKT BOARD ASSY INCLUDES TRANSISTOR PMOS FET PWR 200V A6438 0440 A6Q538 540 ATTACHING PARTS SCR ASSEM WSHR 4 40 X 0 437 PHN STL INSULATOR PLATE XSTR TO 3P SI RUBBER END ATTACHING PARTS ASSY SP ELEC 2 26 AWG 6 0 1 RIBBON A6W66 SWITCH THERMOSTATIC NC OPEN 70 DEG C 3A 250V 6592 ATTACHING PARTS SCR ASSEM WSHR 4 40 X 0 25 PNH STL END A
162. htening 370B Service Manual 5 117 Performance Verification Examining the Limiter for 0 4 MAX PEAK POWER WATTS Range 2 Change the following 370B settings DISPLAY VERTICAL CURRENT DIV 500 uA COLLECTOR COLLECTOR SUPPLY MAX PEAK POWER 0 4 WATTS 3 EXAMINE that the LIMITER indicator lights when the VARIABLE COLLECTOR SUPPLY control is rotated clockwise and that the peak of the trace brightens Examining the Limiter for 10 MAX PEAK POWER WATTS Range 4 Change the following 370B settings DISPLAY VERTICAL CURRENT DIV 5 mA COLLECTOR COLLECTOR SUPPLY MAX PEAK POWER 10 WATTS 5 EXAMINE that the LIMITER indicator lights when the VARIABLE COLLECTOR SUPPLY control is rotated clockwise and that the peak of the trace brightens Removing the Setup 6 Change the following 370B setting LEFT RIGHT STANDBY STANDBY 7 Remove the Patch Cord from the 370B 5 118 370B Service Manual Performance Verification AUX Supply H1 Checking AUX SUPPLY Accuracy Resolution and Range 370B Service Manual Equipment Required see Table 5 3 m Test Oscilloscope m Digital Multimeter Specifications m The Aux Supply is accurate to less than 50 mV 1 5 of the total output m Resolution is 20 mV m Range is from 40 V to 40 V Digital Multimeter To AUX SUPPLY OUT To 370B Ground Jack 370B settings Initialize the 370B then set the following control as indicated OUTPUTS ENABLED
163. ied examined in G5 DC Not Specified examined in G5 LEAKAGE Not Specified examined in G5 DC Mode Ripple G Max Peak Volts G G2 Voltage Accuracy Range G Max Peak Current Q N Peak Power Watts Variable Collector 0 to 100 0 Supply Safety Interlocks G2 G4 Not Specified examined in G5 Not Specified examined in G5 Warning Indicator Not Specified examined in G5 Limiter Indicator Not Specified examined in G6 G7 Looping Compensation Not Specified examined in C7 C7 Voltage Limiter Q BLM NM NM Current Limiter 370B Service Manual Performance Verification Table 5 2 Performance Check Summary Cont Characteristic Adjusted STEP GENERATOR Accuracy Current or voltage steps including offset Incremental F6 F7 F8 F1 F2 Absolute F4 F5 F9 F10 Fi F2 Offset Control Range F5 Resolution mn Current Mode Amplitude Range F Max Current F10 Max Opposing Volts F13 Output Impedance Amplitude switch range Max opposing Fit Pulsed Steps F13 Steps and Offset Polarity F14 Number Of Steps AUX SUPPLY Range and resolution Ripple Plus Noise 370B Service Manual 5 5 Performance Verification 5 6 Table 5 2 Performance Check Summary Cont Characteristic NON STORAGE VERTICAL DEFLECTION SYSTEM Maximum Displayed Noise or Ripple Calibrator Voltage E7 Not Specified examined in C1 DIGITAL STORAGE VERTICAL ACQUISITION Colle
164. ient time to perform preventive maintenance is preceding electrical adjustment of the instrument WARNING Dangerous potentials exist at several points throughout this instru ment When the instrument is operated with the covers removed do not touch exposed connections or components Some transistors have voltages present on the case Disconnect power before cleaning the instrument or replacing parts The side top and bottom cabinet panels provide protection to personnel from operating potentials present within the instrument In addition they reduce radiation of electromagnetic interference from the instrument The cabinet panels are held in place by slotted fasteners To remove the panels turn each fastener counterclockwise a quarter turn with a large screwdriver Lift the panels away from the instrument Operate the instrument with the panels in place to protect the interior from dust The 370B should be cleaned as often as operating conditions require Accumula tion of dirt in the instrument can cause overheating and component breakdown Dirt on components acts as an insulating blanket and prevents efficient heat dissipation It also provides an electrical conduction path that may result in instrument failure CAUTION Avoid the use of chemical cleaning agents that might damage the plastics used in this instrument Use a non residue type of cleaner preferably Isopropyl alcohol or totally denatured ethyl alcohol Before using an
165. ils using one of the methods depicted in Figure 2 6 Note that the rear mounting bracket can be installed to fit either deep or shallow cabinet racks 4 After mounting the instrument in the slide out tracks adjust for proper width by loosening the front and rear screws and allowing the slides to seek the proper width Center the instrument then tighten the screws FRONT RAIL BAR NUT Use if the front rail is not tapped 1 FRONT RAIL MOUNTING Figure 2 6 Mounting Stationary Rackmount Sections BAR NUT 2 DEEP RACK MOUNTING REAR RAIL BAR NUT 3 SHALLOW RACK MOUNTING 370B Service Manual Getting Started Rackmount to Cabinet Conversion 370B Service Manual 5 Push the instrument into the rack and check that the automatic spring latch engages the spring latch catch to hold the instrument in place 6 Extend the instrument out of the rack by pulling the rackmount latch releases on the front panel see Figure 2 2 out to disengage the spring latches Then pull the instrument out 7 Once the instrument is out of the rack press the latch release and push the instrument back into the rack To convert the 370B rackmount version to a cabinet model use the following procedure see Figure 2 7 1 Remove the bracket from each comer of the instrument rear panel 2 Replace the left and right side panels with cabinet model side panels 3 Mount a carrying handle assembly on the left and right sides of the
166. imum Spot setting VOLTS DIV setting WATTS Width Ripple 16 200 mV 320 mV 1 6 div G4 Checking Maximum J Peak Currents P Specification m Minimum Current Available Current is gt 10 A for the 16 V COLLECTOR SUPPLY 2 A for 80 V 400 mA for 400 and 50 mA for 2000 V 370B Service Manual 5 109 Performance Verification TO RIGHT EMITTER COLLECTOR PATCH CORD 370B settings Initialize the 370B then set the following control as indicated DISPLAY HORIZONTAL VOLT DIV 500 COLLECTOR SUPPLY MAX PEAK POWER 220 WATTS POLARITY DC CURSOR Mode DOT POSITION DISPLAY OUTPUTS ENABLED LEFT RIGHT STANDBY RIGHT Protective Cover Closed Checking 16 V Maximum Current 1 CHECK that the trace can reach the value specified in Table 5 17 when VARIABLE COLLECTOR SUPPLY control is turned clockwise 5 110 370B Service Manual Performance Verification Checking 80 400 2000 V Maximum Current 2 Change the following 370B settings DISPLAY VERTICAL CURRENT DIV 500 mA COLLECTOR SUPPLY MAX PEAK VOLTS 80 3 CHECK that the trace can reach the value specified in Table 5 17 when VARIABLE COLLECTOR SUPPLY control is turned clockwise 4 CHECK that the trace can reach the value specified in Table 5 17 by repeating steps 2 and 3 for each VERTICAL CURRENT DIV and MAX PEAK VOLTS setting in Table 5 17 MAX PEAK POWER WATTS should be automatically change to 50 when the MAX PEAK VOLTS setting is changed from 400 to 200
167. ing 1 nA div to 2 mA div in a 1 2 5 sequence Collector supply polarity is either LEAKAGE x10 MAG extends max sensitivity to or LEAKAGE 100 pA div 1 pA resolution Within 1 5 of DOT cursor readout 0 05 x VERT DIV setting 1 nA 1 step division 1 step 10 divisions With x10 MAG 10 steps division With STEP MULTI 1 x Within 0 3 division 10 divisions in 0 1 division resolution Within 1 5 of offset 0 06 x VERT DIV setting Within 1 5 of DOT cursor readout 0 3 x VERT DIV setting Within 0 04 x VERT DIV setting 370B Service Manual Specifications Table 1 6 Non store Horizontal Deflection System Characteristic Cursor Accuracy typical Collector Volts Range Accuracy typical Maximum displayed noise Base Emitter Volts Range Accuracy typical Input impedance Maximum displayed noise Step Generator Display Range Accuracy Display Offset Range Accuracy Display x10 MAG Accuracy Display Invert Accuracy 370B Service Manual Performance Requirement Operating Information WINDOW Cursor within 0 06 division 50 mV div to 500 V div in a 1 2 5 sequence x10 MAG extends maximum sensitivity to 5 mV div 50 uV resolution Within 2 of WINDOW cursor readout 0 1 x HORIZ DIV setting Less than 0 02 of MAX PEAK VOLTS setting 50 mV div to 5 V div in a 1 2 5 sequence x 10 MAG extends maximum sensitivity to 5 mV div 50 uV resolution Within 2 of WIN
168. ing Installing the Floppy Disk 1 Set the write protect tab of the floppy disk to write enable position 2 Install the floppy disk in the floppy disk slot of the 370B CAUTION The following step for data formatting will erase all data on the floppy disk Formatting the Floppy Disk 3 Press the SAVE FORMAT button while holding down the FAST SHIFT button then press the SAVE FORMAT button 4 EXAMINE the FORMAT END message is displayed after formatting Examining Read Write Operation 5 Press the RECALL DIRECTORY button while holding down the FAST SHIFT button 6 Press the up MEMORY button to set the DIRECTORY PAGE to 7 370B Service Manual Performance Verification 370B Service Manual EXAMINE the lt READ ERROR gt message is not displayed at any of the memory locations EXAMINE the lt READ ERROR gt message is not displayed at any of the memory locations when repeating steps 6 and 7 from DIRECTORY PAGE 8 to 28 Press the STORE button to exit from the directory display mode 5 131 Performance Verification 5 132 370B Service Manual Instrument Options EEE Options and Accessories Options This subsection describes the following options available with the 370B Programmable Curve Tracer m Option 1R Rack mounting m Option D1 Test result report m Option A9 No power cord supplied Option1R 370B Programmable Curve Tracer comes configured for installation in a 19 inch wide inst
169. ing symbols may appear on the product E WARNING Protective Ground CAUTION Double High Voltage Earth Terminal Refer to Manual Insulated 370B Service Manual EEE ee Service Safety Summary 370B Service Manual 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 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 mains power by means of the power cord or if provided the power switch 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 Service Safety Summary 370B Service Manual Preface Manual Structure 370B Service Manual This is the service manual for the 370B Programmable Curve Tracer The manual contains information needed to service the 370B to the module level This manual is divided into sections such as Specifications and Theory of Operation Further some sections are divided into subsections such as Product Description and Removal and Installation Procedures
170. ircuit board locator ctions 1 8 1 Circuit Board Interconne 370B Service Manual 8 2 370B Service Manual 370B Service Manual ORTHO GO NALITY3 L120 P14 LAMP MODULE 2 100 CRT qs L100 ROTATION 2 RIBBON CS RIBBON q A18 CAT OUTPUT AS DISPLAY CONTROL W14 RIBBON 5 BRIBBON wise 1 MOTHER P194 J134 6 RIBBON W194 P28 W280 Peg w290 E 100 L 2270 wig oc 10 i 2 SEE 0 7 amp Wid D e W270 A4 DIGITAL DISPLAY J272 SEE e J274 P274 P220 2BFLAT 26PINS 10 RIBBON Ut GPIB A22 INTERFACE PLOTTER 4400 4400 37 34FLAT PINS 412 6RIBBON R A 18 FLAT P70 P72 1 5 10 RIBBON aa W72 J490 W410 W412 SEE 50 PINS A7 STEP GENERATOR 4 T4100 POWER I I t Pu ABPINS P62 4PINS 592 WEG 2 70 2 AG COLLECTOR SUPPLY CIRCUIT BOARD INTERCONNECTIONS 1 8 4 370B Service Manual GUARD BOX l l l SEE see gt FDD INTERFACE Je
171. istor 5 76 370B Service Manual Performance Verification Adjusting Current 1 Balance A7R325 NOTE The characteristics examined in this step is provided as an example of typical instrument operation to aid in the adjustment of R325 it is not a specification To Left Emitter 370B settings Initialize the 370B then set the following controls as indicated COLLECTOR SUPPLY 220 MAX PEAL POWER WATTS STEP GENERATOR STEP AMPLITUDE 10 mV NUMBER OF STEPS 0 PULSE LONG DISPLAY VERTICAL CURRENT 1 mA COLLECTOR CURSOR DOT POSITION DISPLAY OUTPUTS ENABLED LEFT RIGHT STANDBY LEFT Protective Cover Closed 370B Service Manual 5 77 Performance Verification 5 78 F4 Checking OFFSET Accuracy in VOLTAGE Mode Examining for Current Balance 1 Move the spot to vertical graticule center while pressing the up Position Control button 2 Note the vertical CURSOR readout 3 Turn the VARIABLE COLLECTOR SUPPLY for a horizontal cursor readout of 10 00 V 4 EXAMINE the vertical CURSOR readout for the difference in value from part 3 is between 0 00 and 0 30 mA If it is not within this limit the following adjustment is necessary Adjusting for Current Balance 5 Adjust R325 on A7 Step Generator board to the value noted in part 3 Removing the Setup 6 Remove the patch cord Specification Absolute accuracy is less than 1 5 of the total output 3 of the STEP AMPLITUDE settin
172. 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 analyzer Use this list to identify and order replacement parts The following table describes each column in the parts list Parts List Column Descriptions Column Column Name Description 1 Items in this section are referenced by component number 2 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 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 an item name may sometimes appear as incomplete Use the U S Federal Catalog handbook H6 1 for further item name identification 7 Mfr Code This indicates the code of the actual manufacturer of the part Code to name and address cross reference is located after this page 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 The fo
173. ital Multimeter Mode DC Current 5 89 Performance Verification Checking Accuracy of Steps 0 and 1 1 Record the value of digital multimeter reading 2 press MEASUREMENT REPEAT once Note that the displayed spot moves 1 division higher 3 CHECK the reading value for Step 1 differs from the reading value for StepO within 200 mA 3 mA Checking Accuracy of Steps 2 through 10 4 CHECK that for each time the spot is advanced 1 division with the MEASUREMENT REPEAT button 5 Record the value of the digital multimeter reading 6 CHECK the current difference from the previous reading are within 200 mA 3 mA NOTE If step F9 and F10 will not be performed complete the instructions given under Replacing the Storel Non Store Jumper at the end of Step F10 before proceeding to another step or ending the procedure Removing the Setup 7 Change the following 370B setting LEFT RIGHT STANDBY STANDBY 8 Remove the Digital Multimeter 5 90 370B Service Manual Performance Verification F9 Checking Maximum Voltage Output in VOLTAGE Mode 370B Service Manual Specifications m Absolute accuracy of the Step Generator is less than 1 5 of the output voltage 3 of the STEP AMPLITUDE setting 1 mV m Maximum voltage output is 20 times the STEP AMPLITUDE setting NOTE If previous step was not performed complete the instructions given under Moving the Store Non Store Jumper at the beginning o
174. ition Non Store Gain and D A Gain Adjusting SX Position A5 R508 SY Position A5 R528 D A Gain A4 R842 X Gain A5 R554 Y Gain A5 R574 Orthogonality A5 R80 Geom A18 R410 370B Service Manual _ t Specifications m Orthogonality is 90 within 0 3 m Geometry includes two categories 1 Tilt or bowing is no more than 0 5 minor division 2 Keystone effect is no more than 0 75 minor division NOTE Characteristics in EXAMINE steps are provided as examples of typical instrument operation to aid in adjustment they are not specifications 370B settings NON Initiating the Test Pattern 1 Change the following 370B setting POWER OFF 2 Hold the FAST SHIFT button depressed and set the 370B POWER to ON This initiates the diagnostic routine The corporate logo first appears followed by the display test pattern shown in Figure 5 1 5 31 Performance Verification COLLECTOR PEAK VOLTS Figure 5 1 Diagnostic test pattern display The test pattern consists of the Frame Test Pattern overlaid over the Dot Test Pattern 3 Turn the GRAT ILLUM control fully clockwise for maximum brightness 4 Set the Frame Test Pattern to the same intensity as the graticule using the Intensity READOUT CURSOR control and set the Dot Test Pattern slightly brighten using the intensity NON STORE STORE VIEW INTENSITY control Examining Store Position 5 EXAMINE the display to determine wh
175. ktronix part numbers xi Preface Manual Conventions Modules Safety This manual uses certain conventions that you should become familiar with Some sections of the manual contain procedures for you to perform To keep those instructions clear and consistent this manual uses the following conven tions m Names of front panel controls appear in the same case initial capitals all uppercase etc in the manual as is used on the 370B Programmable Curve Tracer front panel Front panel names are all upper case letters for example SAVE VIEW etc m Instruction steps are numbered unless there is only one step Throughout this manual any replaceable component assembly or part of the 370B Programmable Curve Tracer is referred to generically as a module In general a module is an assembly like a 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 370B Programmable Curve Tracer is a module Symbols and terms related to safety appear in the Safety Summary near the beginning of this manual Finding Other Information xii Other documentation for the 370B includes The 370B Programmable Curve Tracer User Manual contains a tutorial to quickly describe how to operate the370B Programmable Curve Tracer It also includes an in depth discussion on how to more completely use the 370B Programmable Curve Tracer feat
176. l A24 Floppy Disk Drive Assembly Remove and replace the A24 FDD assembly as follows 1 Pull out the drawer unit from the main body of the 370B 2 Remove the connector through the W200 on the A23 FDD Interface circuit board from the A24 FDD assembly 3 Remove the A24 FDD assembly by removing the four securing screws from the FDD assembly 4 Replace the A24 FDD assembly in the reverse order of removal H V Relay Module Remove and replace the H V Relay module as follows 1 Remove the A9 L V Relay circuit board See the A9 L V Relay Circuit Board removal instructions 2 Remove the four screws securing the wires to J8 J11 J12 and J13 on the Series Resistor module 3 Remove the H V Relay module by removing the four screws securing the H V Relay module to the guard box chassis 4 Replace the H V Relay module in the reverse order of removal NOTE See the label on the Series Resistor module showing the destination of each wire and connector Series Resistor Module Remove and replace the Series Resistor module as follows 1 Remove the A9 L V Relay circuit board See the A9 L V Relay Circuit Board removal instructions NOTE When removing connectors from a board tag each one to prevent misconnection while reassembling 2 Remove the six screws securing the wires to J1 J2 J8 J 11 J12 and J13 on the Series Resistor module Remove the two screws securing the wires to J91 370B Servic
177. l Multimeter Reading Limits with Setting max OFFSET 200nA 1963 nA to 2037 nA 2 uA 19 64 uA to 20 36 uA 20 uA 196 4 uA to 203 6 uA 200 uA 1964 uA to 2036 uA 2mA 19 64 mA to 20 36 mA 20 mA 196 4 mA to 203 6 mA 200 mA 1964 mA to 2037 mA Checking Maximum OFFSET without INVERT 2 Change the following 370B setting STEP GENERATOR POLARITY INVERT Off The INVERT indicator will go out 3 CHECK that the digital multimeter measurement is within the limits shown in Table 5 14 under Maximum OFFSET for each setting of the STEP AMPLITUDE control Removing the Setup 4 Change the following 370B setting LEFT RIGHT STANDBY STANDBY 5 Remove the Digital Multimeter 5 82 370B Service Manual Performance Verification Alternate Method 6 Change the following Test Equipment setting Digital Multimetere Mode Volts 7 Connect a 0 025 Q Resistor to the Left Base jack B to the Left Emitter jack E and connect the Digital Multimeter to the leads of the Resistor as shown in Figure 5 6 Digital Multimeter To Left Base a Resistor Figure 5 6 Checking for Maximum OFFSET of 200 mA Range Checking Maximum OFFSET of 200 mA Range 8 Change the following 370B settings STEP GENERATOR POLARITY INVERT Off STEP AMPLITUDE 200 mA OFFSET 2000 mA 9 CHECK that the Digital Multimeter readout is 49 1 mV to 50 9 mV 10 Change the following 370B settings STEP GENERA
178. llowing table cross indexes codes names and addresses of manufacturers Cross Index or vendors of components listed in the parts list 9 2 370B Service Manual Mechanical Parts List Manufacturers cross index Mfr code Manufacturer 3109 FELLER TKOAR KITAGAWA IND CO LTD TKOAU CHIYODA DENSHI CO LTD TKOBI ACOUS IND CO LTD TKOBK SHOWA KOSAN CO LTD TKOBV KYODO LIGHT METAL CO LTD TKOCB TKYMFGCOLTD TKOCF YASUDA MFG CO LTD TKOFB NIHON BURNDY 007 ASSOCIATES CO LTD TKO191 TEKTRONIX JAPAN Ltd 0413 5 SUPPLY COMPANY TK0435 LEWIS SCREW CO TK0588 UNIVERSAL PRECISION PRODUCTS TK1181 SEA TAC INDUSTRIES INC TK1267 ELECTRIC CORP TK1499 AMLAN INC TK1665 PORTLAND DIE AND STAMPING INC TK1741 COLMAN FASTENERS CO LTD TK1943 NEILSEN MANUFACTURING INC TK2541 AMERICOR ELECTRONICS LTD TK2548 XEROX BUSINESS SERVICES DIV OF XEROX CORPORATION 0JR05 TRIQUEST CORP 0 01 STAUFFER SUPPLY 07416 NELSON NAME PLATE CO 11897 PLASTIGLIDE MFG CORP 12327 FREEWAY CORP 12697 CLAROSTAT MFG CO INC 370B Service Manual Address 72 VERONICA AVE UNIT 4 2 4 26 MUROMACHI NIHONBASHI CHUO KU 2 5 12 MITA MEGURO KU 2 6 TA CO KANDA CHIYODA KU 2 947 IKEBUKURO TOSHIMA KU 2 5 3 NIHONBASHI CHUO KU 2 18 8 MASUGATA TAMA KU KAWASAKI CITY 81 1 OKESHITA NISHIMAKADO NUMAZU CITY 3 26 33 TAKANASA MINATO KU 1 2 2 MOMOI SIGINAMI KU 5 9 31 KITASHINAGAWA SHINAGAWA KU TOKYO 1850 W 205TH ST
179. mechanism you can make a high precision measurement because that the effect of conductance from the contact between the cables and DUT leads is suppressed to a minimum The Sense terminals in the 370B adaptor connector and the A1001 through A1005 test adaptors are for Kelvin sensing The measurement can be performed without Sense terminals however if you need high precision measurement use the those terminals Getting Started Connections for Kelvin Sensing ZN 2 6 When a DUT does not fit in any of the test adaptors and you prepare a specific test adaptor for example use cables to connect terminals and DUT leads as shown in Figure 2 1 for Kelvin sensing CAUTION Confirm that the the DUT leads and the force terminals C B and E are firmly connected Making improper connections may cause the DUT to be broken Before a measurement also verify that the cables are not down and the contact between the terminals and cables are made properly To avoid electric shock and damage to the instrument perform measurement only within the protective cover Do not disable the interlock mechanism and or do not take the cables out of the protective cover to perform measurement without or outside the cover Cables Adaptor Connector Terminals E SENSE SENSE SENSE Figure 2 1 Example of Kelvin sense connection 370B Service Manual Getting Started Rackmounting Information Latching Rackmounting A 370B Service Man
180. n wave peak an VCC and VDD erminal VCC and VDD POWER WATTS cite oto 6 COLLECTOR SUPPLY gt for DCthalf wave are off switch ok 2W Then tum VARIABLE OUTPUT BOARD rectified OK OK negative sine wave COLLECTOR SUPPLY to 100 Check A19 L V SUPPLY Replace 92 BOARD OK Check A1 MOTHER BOARD and A19 L V SUPPLY BOARD Set MAX PEAK VOLTS switch to 16V MAX 2 Set VERTICAL switch to f 50 mA DIV and MAX PEAK COLLECTOR POWER WATTS switch to COLLECTOR Sine wave 0 2W Make a short circuit SUPPLY YES POWER WATTS switch to SUPPLY YES FINISH 2 Vp p betweenLEFT EMITTER LIMITTER LED 10W Thenturn VARIABLE LIMITTER LED COLLECTOE SUPPLY to is ON 100 and LEFT COLLECTOR and set LEFT RIGHT STANDBY switch to LEFT is OFF appears Check A1 MOTHER Check A6 COLLECTOR Check A6 COLLECTOR SUPPLY OUTPUT BOARD SUPPLY OUTPUT BOARD 8 16 Troubleshooting Tree cont 370B Service Manual Disconnect LEFT EMITTER and LEFT COLLECTOR and connect 10k Q 1 4W 5 resistor between LEFT BASE and LEFT EMITTER Check step signal 1V step 5steps appears across the resistor St Disconnect P72 on A7 ep STEP GENERATOR 2 Connect P72 on A7 appease Dotween BOARD and check 5VD All voltage STEP GENERATOR Fuse F100 LEFT BASE and 5V 6 5 K BOARD to J7 bl LEFT EMITIER 3 2 6 5V 12V 40V are Ol OARD to J72
181. n 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 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 inte
182. nch handling Operating Packaged transportation drop Packaged transportation vibration 370B Service Manual 10 C to 40 C 20 C to 60 C 40 C to 65 C x 15 C per hour no condensation x 30 C per hour no condensation Five cycles 120 hours with equipment tested at 80 relative humidity Tested on operating at 60 C and operating to meet MIL STD 810C method 507 1 procedure IV modified as specified in MIL T 28800B paragraph 4 5 1 1 2 2096 to 8096 no condensation Maximum wet bulb temperature shall be 29 C 1096 to 9096 no condensation Maximum wet bulb temperature shall be 40 0 C 5 to 95 no condensation Maximum wet bulb temperature shall be 45 0 C Up to 3 0 km 10000 feet Maximum operating temperature decreases 1 C each 1 000 feet above 1 5 km 5 000 feet Up to 15 km 50000 feet 2 352 m s 0 24 Gims 5 Hz to 500 Hz 196 m s 20 G half sine 11 ms duration Three shocks per axis in each direction 18 shocks total Drop from 10 cm 4 in tilt or 45 which ever less Tilt not to balance to point Meets the limits of the National Safe Transit Association test procedure 1A B 2 10 drops of 61 cm 24 in Meets the limits of the National Safe Transit Association test procedure 1A B 1 excursion of 2 5 cm 1 in p p at 4 63 Hz 10 8ms s 1 1 G for 60 minutes Specifications Table 1 16 Certifications and Compliances Category EC Declaration of Co
183. ner to lower right corner 2 EXAMINE the display as the up Position Control button is pressed for the spot to move continuously from lower right corner to upper right corner 3 CHECK the vertical and horizontal CURSOR readout within 0 32 V Checking Negative Offset 4 Change the following 370B setting COLLECTOR SUPPLY POLARITY UJ POSITION Simultaneously press the up and down Position Control buttons then simultaneously press the left and right Position Control buttons 5 EXAMINE the display as the left Position Control button is pressed for the spot to move continuously from upper right corner to upper left corner 6 EXAMINE the display as the down Position Control button is pressed for the spot to move continuously from upper left corner to lower left corner 7 CHECK the vertical and horizontal CURSOR readouts within 0 32 V 370B Service Manual 5 37 Performance Verification C7 Adjusting Looping T Compensation A10R139 A10R224 A35R500 NOTE The characteristics examined in this step are provided as examples of A35R501 A35R502 typical instrument operation to aid in the adjustment of R139 R224 R500 A35R503 A35R504 R501 R502 R503 R504 they are not specifications The accuracy of the vertical displayed noise may be affected by these adjust ments See E7 370B settings Initialize the 370B then set the following controls as indicated DISPLAY Mode NON STORE VERTICAL CURRENT
184. nformity EMC Emissions Immunity Australia New Zealand Declaration of Conformity EMC Safety Self Declaration Installation Category Pollution Degree Standards or description Meets intent of Directive 89 336 EEC amended by 93 68 EEC EN 61326 1 1997 Product Family Standard for Electrical Equipment for Measurement Control and Laboratory Use EMC Requirement EN 55011 Class A Radiated and Conducted Emissions EN 61000 3 2 Power Line Harmonic EN 61000 3 3 Line Voltage Alteration and Flicker EN 61000 4 2 Electrostatic Discharge Immunity EN 61000 4 3 Radiated RF Electromagnetic Field Immunity Note The output level of Step Generator may vary in this test EN 61000 4 4 Electrical Fast Transient Burst Immunity EN 61000 4 5 Surge Immunity Note The output level of collector supply may decrease in this test EN 61000 4 6 Conducted Disturbance induced by RF Field Immunity EN 61000 4 8 Power Frequency Electromagnetic Field Immunity EN 61000 4 11 Voltage Drop Short Interruptions and Voltage Variations Immunity Note The output of Collector Supply is disabled after this test Complies with EMC provision of Radio Communications Act per the following standard Industrial Scientific and Medical Equipment 1992 UL3111 1 CAN CSA C22 2 NO 1010 1 EN 61010 1 with second amendment Power input Installation Category as defined in IEC 61010 1 Annex J Pollution degree 2 as defined in IEC 61010 1 370B Service Manu
185. nix part Serialno Serial no number number effective discont d 57 671 1149 02 58 129 1131 XX 59 129 1128 XX 60 131 3677 XX 61 260 2156 00 62 366 0617 XX 63 671 B235 00 64 211 0661 XX 65 407 3474 XX 66 311 2457 00 67 210 0583 XX 68 210 0046 XX 69 407 3475 XX 70 311 2456 00 71 210 0583 XX 72 210 0046 XX 73 210 0223 XX 74 196 3096 00 75 196 3096 00 76 174 0293 00 77 210 0201 XX 78 211 0008 XX 79 407 3851 XX 80 211 0106 XX 81 386 A842 00 370B Service Manual Qty Name amp description 1 54 38 44 CIRCUIT BD ASSY SUB KEY A12 ATTACHING PARTS SPACER POST 12 7MM L 4 40 THD BRASS END ATTACHING PARTS CKT BOARD ASSY INCLUDES SPACER POST 5 1MM L POLYCARBONATE CONN RCPT ELEC 1 X 5 FEMALE SWITCH KEY A12S300 301 S302 303 S304 305 310 311 S312 313 314 S315 S320 321 S322 S323 5324 5325 5330 5331 5332 5333 5335 5350 9351 5353 354 S355 360 361 S362 S363 364 365 S370 S371 372 373 PUSH BUTTON SILVER GRAY 9 6 X 4 2 X 8 5MM CKT BOARD ASSY MAIN KEY A11 ATTACHING PARTS SCR ASSEM WSHR 4 40 X 0 25 PNH STL END ATTACHING PARTS CKT BOARD ASSY INCLUDES BRACKET ANGLE VAR RES MTG RES VAR NONWW PNL 10K OHM 1 2W 20 A11R302 R312 R322 R330 R340 ATTACHING PARTS NUT PLAIN HEX 0 25 32 X 0 312 BRS WASHER LOCK 0 261 ID INTL 0 018 THK STL END ATTACHING PARTS BRACKET ANGLE VAR RES MTG W CUT LEAD RES VAR NONWW PNL 10K OHM 1 2W 20 A11R350 R3
186. noise Maximum capacitive load typical Output Impedance typical Fall and rise time typical Overshoot typical Step rates Pulsed steps Steps and offset polarity Number of steps 1 8 Performance Requirement Operating Information 50 mV to 2 V in a 1 2 5 sequence of 6 steps 20 x STEP AMPLITUDE At least 500mA at 10V or less at least 200mA at 15 V at least 10 mA at 40 V 2 500 mA 50 20 10 x STEP AMPLITUDE Less than 20 mA Less than 0 5 x STEP AMPLITUDE BW 20 MHz with open circuit 10 mV 0 01 uF 200 mQ or less Within 50 us for 1 step or 100 us for 1 load at 2 V step 10 steps 1 kQ load 2 V step Within 10 of transition amplitude 1 1 kQ load at 2 V step load 2 V step 2 x line frequency 1 x line frequency in AC collector supply mode Steps occur at 0 collector voltage 80 us or 300 us wide 1096 At mesial line with 1 kQ load 1 mA STEP Corresponds to Collector Supply Polarity when STEP GENERATOR POLARITY INVERT is disabled Opposite to Collector Supply Polarity when STEP GENERATOR POLARITY INVERT is selected or CONFIGURATION switch is set to BASE COMMON BASE COMMON configuration disables STEP GENERATOR POLARITY INVERT Ranges from 0 to 10 370B Service Manual Specifications Available max current of Step Generator in 100 mA and 200 mA step d 8V 2A 2A Q E 0 0v 8V 10V Load Voltage
187. ns such as thermal drift 1 1 Product Overview 1 2 m Almost all of the 370B front panel settings can be controlled by GPIB commands Exceptions are those controls intended only for manual operation such as INTENSITY FOCUS GRAT ILLUM etc Also curve data can be sent to or received from an external controller through the GPIB m The printer interface permits sending displayed curve data and digital on screen readouts to a printer without an external controller m Other features include an auxiliary voltage supply cursor measurement readout and diagnostic routines 370B Service Manual PEE Specifications This section contains the 370B Programmable Curve Tracer specifications All specifications are guaranteed unless labeled typical Typical specifications are provided for your convenience but are not guaranteed Performance Conditions The performance limits in this specification are valid with these conditions m The 370B Programmable Curve Tracer must have been calibrated adjusted at an ambient temperature between 20 C and 30 C m The 370B Programmable Curve Tracer must be in an environment with temperature altitude humidity and vibration within the operating limits described in these specifications m The 370B Programmable Curve Tracer must have had a warm up period of at least 20 minutes m The 370B Programmable Curve Tracer must be operating at an ambient temperature between 10 C and
188. nstrument Operate the instrument with the panels in place to protect the interior from dust and to maintain cooling airflow The collector supply produces AC rectified AC or DC voltages ranging from 0 to 2000 volts This high voltage combined with a current sensitivity of 100 pA div permits extended breakdown measurements of a device under test A step generator produces voltage or current steps of either polarity for application to the base or emitter terminal The step generator may also be operated in a pulsed mode to control the power dissipated by the DUT In addition to conventional curve tracer performance the 370B Programmable Curve Tracer includes the following features m Digital storage capability that allows bright and stable display and useful cursor measurements The 370B has a mass storage system consists of non volatile IC memory and 3 5 inch floppy disk drive Up to 64 families of characteristic curves and front panel setups can be stored in a floppy disk Up to 16 families of characteristic curves and front panel setups can also be stored in non volatile IC memory The stored characteristic curves can be recalled for additional analysis and comparison m Two extended acquisition modes called Averaging and Envelope Averaging reduces display noise in high sensitivity ranges Envelope mode displays only the maximum and minimum vertical or horizontal excursion of each curve which is useful for detecting long term variatio
189. oard 4 Change the following 370B setting POWER ON 5 EXAMINE the Digital Multimeter for a reading of 2304 V to 2496 V Disconnecting the Meter WARNING To avoid electric shock hazard be certain the 370B POWER switch is set to OFF before disconnecting the Digital Multimeter lead and the high voltage shield 6 Change the following 370B setting POWER OFF 7 Disconnect the High Voltage Probe and Digital Multimeter from the 370B Replacing the High Voltage Shield 8 Replace the high voltage shield 9 Change the following 370B setting POWER ON 370B Service Manual Performance Verification B2 Examining CRT Bias Adjusting CRT Bias A20 R210 370B Service Manual 1 NOTE The characteristics examined in this step are provided as examples of typical instrument operation to aid in the adjustment of R210 they are not specifications 370B settings Initialize 370B then set the following controls as indicated DISPLAY Mode NON STORE COLLECTOR SUPPLY POLARITY AC Examining CRT Bias 1 Change the following 370B settings INTENSITY NON STORE STORE VIEW Fully counterclockwise READOUT Cursor Fully counterclockwise GRAT ILLUM Fully counterclockwise 2 EXAMINE the CRT for the displayed spot to be barely visible If the spot is bright or not visible at all the following adjustment may be necessary 5 19 Performance Verification Adjusting CRT Bias NOTE R210 can be
190. ode Ray Tube Replacement Replace the Cathode Ray Tube CRT as follows 1 8 9 Place four CRT retainers into each guide line located at each corner of the front panel CRT opening Insert the CRT into the front panel opening and set it firmly against the CRT clamp ring located at the rear of the CRT shield Clean the CRT face plate and place the A28 and A29 lamp boards on the right and left sides of the CRT respectively Replace the CRT cushion Fasten the CRT frame by fixing four screws located on the outer sides of the CRT frame Tighten the four screws located on the inner sides of the CRT frame by applying 5 kg cm 4 3 inch Ib of torque Tighten the two screws beside the CRT base until the springs on the screws are fully compressed Replace the CRT base pin socket on the CRT base pins Replace the CRT implosion shield CRT spacer and CRT filter Replace the CRT bezel and bezel cover 10 Reconnect the CRT anode cap 11 Replace the rear panel and the top cabinet panel NOTE Replacing the CRT requires re adjustment of the 370B 370B Service Manual Maintenance Boards 370B Service Manual To determine the location of a circuit board see Figure 8 1 page 8 1 in Section of diagrams Chassis Mounted Boards Remove and replace all chassis mounted circuit boards as follows 1 Disconnect all pin connectors attached to the board or that connect the beard to other parts of the instrument
191. ollowing 370B setting CONFIGURATION EMITTER OPEN EXT 5 EXAMINE the test oscilloscope for no step waveform display 6 Use a patch cord to connect the STEP GEN OUT and EXT BASE or EMITTER IN jacks and close the protective cover 7 EXAMINE the test oscilloscope display for a step waveform Removing the Setup 8 Disconnect the test oscilloscope and remove the patch cord from the 370B 370B Service Manual Performance Verification Key Operation and Floppy Disk Drive Equipment Required see Table 5 3 2HD Floppy Disk J1 Examining Key NOTE The characteristics examined in this step are examples of typical Operation instrument operation they are not specifications 370B settings Initial setting Examining Key Operation 1 Simultaneously press the FAST SHIFT and the POSITION DISPLAY buttons to enter KEY CHECK MODE 2 EXAMINE all buttons and knobs while pressing or turning them to change the display Except the INTENSITY FOCUS GRAT ILLUM POSITION and TRACE ROTATION controls 3 Simultaneously press the FAST SHIFT and the POSITION DISPLAY buttons to exit KEY CHECK MODE 370B Service Manual 5 129 Performance Verification J2 Examining Floppy Disk Drive Operation 5 130 NOTE The characteristics examined in this step are examples of typical instrument operation they are not specifications Disk Slot Floppy Disk 370B settings Initial sett
192. ollowing use of the 370B at high power settings the device fixture or protective cover may be hot enough to cause injury Avoid touching any of these items until cooled 370B Service Manual Getting Started Test adapter and Protective cover Kelvin Sense A A 370B Service Manual To use the 370B to display and measure the characteristic curves of most devices a test adapter and the protective cover must be installed Four test adapters are provided as standard accessories Six other test adapters are available as optional accessories The test adapter is inserted into the adapter connectors provided on the front panel These connectors allow two devices to be set up at a time WARNING Dangerous voltage may appear at the front panel collector and base terminals To avoid injury or equipment damage do not remove the protective cover CAUTION Double wide test adapters are designed to fit in the left set of adapter connectors If you try to forcibly install a double wide test adapter in the right side you might damage the connector The connectors are identified by the following numbers A1006 A1007 A1009 1010 The 370B provides the adaptor connector equipped with Kelvin sense terminals The Kelvin sense is the way to measure voltage with two independent terminals connecting to each of DUT leads the Force terminal that supplies power and the Sense terminal senses the voltage By using the Kelvin sense
193. om left corner as facing the rear Also check that the air flow arrow marked on the fan housing is pointing toward the inside of the 370B 4 Replace the Cooling Fan in the reverse order of removal Maintenance Line Fuse The line fuse used in the 370B is located within the filter unit on the rear panel Replace the line fuse only with one of proper type and rating Remove and replace the line fuse as follows 1 Remove the AC power cable connector from the line filter housing in the rear panel 2 Remove the fuse cover by pulling it out from the line filter Insert some flat edged tool such as a straight slot screw driver blade tip into the small groove in the outer left side of the housing Use the tool to pull or pry the fuse cover loose 3 Remove the line fuse from its fuse cover 4 Replace the line fuse in the reverse order of removal Semiconductors Do not replace semiconductors unless actually defective If removed from their sockets during routine maintenance return them to their original sockets Unnecessary replacement of semiconductors may affect the adjustment of the instrument When semiconductors are replaced check the operation of circuits that may be affected WARNING To avoid electric shock hazard always disconnect the 370B from the power source before removing or replacing components Replacement semiconductors should be of the original type or a direct replace ment When removing solder
194. on of the service required If the original packaging is unfit for use or not available package the instrument as follows 1 Obtain a corrugated cardboard shipping carton with a 170kg 375Ib test strength that has inside dimensions at least six inches greater than the instrument dimensions Surround the instrument with polyethylene sheeting to protect the finish Cushion the instrument on all sides by tightly packing dunnage or urethane foam between the carton and the instrument allowing three inches on all sides Seal the carton with shipping tape or with an industrial stapler Write the address of the Tektronix Service Center and your return address on the carton in one or more prominent locations 2 13 Getting Started 370B Service Manual Theory of Operation Theory of Operation This section describes the operation of the 370B Programmable Curve Tracer circuits The section is divided into two parts Block Diagram Description and Detailed Circuit Operation Block Diagram Description 370B Service Manual The following description is an overview of the 370B operation Figure 3 1 is an overall block diagram of the 370B The numbers enclosed in diamonds within each block in Figure 3 1 indicate the schematic diagrams associated with the block The 370B is a static and dynamic semiconductor tester that displays and allows measurement of static and dynamic semiconductor characteristics obtained under sim
195. onductive pollution or dry nonconductive pollution that becomes conductive due to condensation These are sheltered locations where neither temperature nor humidity is controlled The area is protected from direct sunshine rain or direct wind Pollution Degree 4 Pollution that generates persistent conductivity through conductive dust rain or snow Typical outdoor locations 370B Service Manual 1 21 Specifications GPIB Interface The IEEE 488 1978 GPIB standard defines the GPIB interface functions and the allowed subsets of those functions Table 1 18 GPIB Interface Function Implemented As Source handshake SH1 Acceptor Handshake AH1 Talker T6 Listener Service request SR1 Remote Local RL2 Parallel poll PPO Device Clear DC1 Device trigger DTO Controller CO 1 22 370B Service Manual Operating Information EEE Operating Information Installation Initial Inspection Power Source Information 370B Service Manual This section provides the following information m Initial inspection procedure m Installation procedures m Kelvin Sense m Rackmounting Information m Repackaging procedure for shipment This instrument was thoroughly inspected for mechanical and electrical defects before shipment It should be free of mars or scratches and meet or exceed all electrical specifications To confirm this inspect the instrument for physical damage incurred in transit and test the electrical performance by
196. ontrols as indicated COLLECTOR SUPPLY AC POLARITY MAG X10 On CURSOR Mode DOT LEFT RIGHT STANDBY LEFT or RIGHT Protective Cover Closed OUTPUTS ENABLED 370B Service Manual Performance Verification E2 Adjusting Looping Balance A10R238 370B Service Manual Determining if Adjustment is Necessary 6 Rotate the LOOPING COMPENSATION control fully clockwise then counterclockwise 7 EXAMINE the vertical CURSOR readout for a reading less than 60 mA If the readout is not within these limits the following adjustment is necessary Adjusting V Balance 8 ADJUST V Balance adjustment R250 on the A10 Sense Board for a vertical CURSOR readout to 0 mA The adjustment is accessible through the right lower rail cutout NOTE The characteristics examined in this step are provided as examples of typical instrument operation to aid in the adjustment of R238 they are not specifications 370B settings Initialize the 370B then set the following controls as indicated COLLECTOR SUPPLY AC POLARITY MAG X10 On CURSOR Mode DOT 5 55 Performance Verification LEFT RIGHT STANDBY LEFT or RIGHT Protective Cover Closed OUTPUTS ENABLED Determining if Adjustment is Necessary 1 Set the LOOPING COMPENSATION control fully clockwise then counterclockwise Note the vertical CURSOR readout Set the LOOPING COMPENSATION control fully clockwise Note the vertical CURSOR readout a eA EXAMI
197. optional accessories listed in Table 6 3 are recommended for use with the instrument Table 6 3 Recommended accessories Accessory Model number Thermal Printer iDP3240 CBM Thermal Printer http www jcbm co jp 6 3 Options and Accessories 6 4 370B Service Manual Electrical Parts List ww ee Replaceable Electrical Parts The modules that make up this instrument are often a combination of mechanical and electrical subparts Therefore all replaceable modules are listed in section Mechanical Parts List Refer to that section for part numbers when using this manual The repair of the 370B Programmable Curve Tracer is the exchange of the board fundamentally This section contains a list of the electrical components for the 370B Program mable Curve Tracer Use this list to identify and order replacement parts Parts Ordering Information Part Number Revision Level 370B Service Manual 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 Instrument type or model number m Instrument serial number m Instrument modification number if applicable I
198. or 2 5M 2 0A 0 00 2 0 nA 450 mV 180nA 175 3 nA to 184 7 nA 500 nA shunt resistor 250kQ 0 000 V 0A 0 00 26 nA 1125 mV 4500nA 4407 nA to 4593 nA 370B Service Manual 5 61 Performance Verification E6 a Checking COLLECTOR CURRENT Accuracy and Range in STORE Mode 5 62 Dd Specifications m STORE mode COLLECTOR CURRENT DIV settings are accurate to within 1 5 of the readout 0 05 division of the setting DC Current Source To Left Collector 370B settings Initialize the 370B then set the following controls as indicated DISPLAY VERTICAL 1 uA CURRENT DIV HORIZONTAL 500 V VOLT DIV COLLECTOR SUPPLY POLARITY Ug POWER WATTS 220 CURSOR Mode DOT LEFT RIGHT STANDBY LEFT Protective Cover Open Test Equipment setting Calibrator Output 0 00 A 1 CHECK that each setting of the VERTICAL CURRENT DIV control listed in Table 5 9 produces a vertical CURSOR readout within the limits given for a Calibrator setting of 0 00 uA open circuit 370B Service Manual Performance Verification 2 Change the following test equipment setting Calibrator Output 9 00 uA 3 CHECK that each combination of VERTICAL CURRENT DIV and Calibrator settings listed in Table 5 9 produces a vertical CURSOR readout within the given limits Removing the Setup 4 Change the following Test Equipment setting Calibrator Output 0 00 uA 5 Disconnect the DC current source from the 370B 6 Close the
199. or tab at each end of the board 4 Replace the plug in board by aligning the board with the guide slots components on the side away from the CRT and inserting it holding the tabs parallel to the top of the board 5 Slide the board down through the slots until the edge connectors rest on the bus slot connectors on the 1 Mother board 6 Push the module down into the bus slot connectors of the Al Mother board Press firmly on the board but do not press on components 7 Replace the two circuit board retainers A method to change from PULSED OFFSET MODE to DC OFFSET MODE NOTE The 370B has two step generator output modes PULSED OFFSET MODE and DC OFFSET MODE The Pulse Offset is the default mode It can be changed to DC OFFSET MODE with the jumper J310 on the A3 A D Board CAUTION When the device under test DUT is Normally On type transistor Pulsed Offset will cause additional heat up for the DUT For the Normally On type transistor DC Offset mode should be used CAUTION When the device under test DUT is Normally Off type transistor DC Offset will cause additional heat up for the DUT For the Normally Off type transistor Pulsed Offset mode should be used 370B Service Manual Maintenance Pulsed Offset When the measurement mode is set to Single or Sweep and the Step Generator Voltage is set the base line offset is applied only in the internal measurement operation interval DC Offset B
200. pecifications 1 19 GPIB Intetface an decet ec e e eet ee ee be peel est s 1 22 Operating Information 2 1 Installation iore de ee er eed EM ku a 2 1 Kelvin Sense uyu l sone IR 2 5 Rackmounting Information 2 7 Repacking for shipment 1 2 13 Theory of Operation 3 1 Block Diagram Description 3 1 Circuit Operation u a ie a gran RO e Rea ela 3 6 Maintenance we re rr Saat Re 4 1 Preventive Maintenance 1 4 1 Corrective Maintenance 4 4 Performance Verification 370B Service Manual Performance Verification 5 1 Using serbe Sh ow x eoe beet es 5 3 Power Supply iia he pb eke ee ee 5 12 CRT eres hed oe eee ette be Ped 5 17 Display be eh bh a ES ie a ke ee ee 5 26 Horizontal peered PS weak e eth ae 5 44 Vertical ES wie be Bes be ek ee ee 5 54 step Generator Wr 5 71 Collector Supply abe eb e ae kee unuq 5 104 AUX
201. r 1 7 Table 1 3 AUX Supply 1 10 Table 1 4 Non store Vertical Deflection System 1 10 Table 1 5 Digital Storage Vertical Acquisition 1 12 Table 1 6 Non store Horizontal Deflection System 1 13 Table 1 7 Digital Storage Horizontal Acquisition 1 14 Table 1 8 and Readout 1 15 Table 1 9 Adapter Connectors 1 16 Table 1 10 Power Supply 1 17 Table 1 11 Surge Current 1 17 Table 1 12 Mechanical Specification 1 17 Table 1 13 Digital Storage Acquisition Mode 1 18 Table 1 14 Text Display 1 18 Table 1 15 Environmental Specification 1 19 Table 1 16 Certifications and Compliances 1 20 Table 1 17 Installation category and Pollution degree Descriptions 1 21 Table 1 18 GPIB Interface 1 22 Table 2 1 Line voltage ranges 2 1 Table 2 2 Power Cord Color Conductor Identification 2 2 Table 2 3 Power cord identification 2 3 Table 4 1 Power on System Error Messages 4 24 Table 4 2 Front Panel Control Identification 4 25 Table 5 1 P
202. rface lt 25 gt The Configuration Circuit is located on the A23 Configuration Relayboard This circuit consists of two relays These relays are driven by the CONFIGURATION control This circuit is located on the 14 LOR Key board and consists of LEDs and associated components LEDs display the LEFT RIGHT STANDBY switch setting information When the microprocessor reads address A8030 HEX the LEFT RIGHT STANDBY key status is read into the microprocessor The Warning LED indicates that dangerous voltage may be applied to the collector or base terminals The Limiter LED indicates that the automatic protection is operating This circuit is located on the A23 FDD Interface board The circuit consists of the Bus Buffer Circuit the Address Decoder Circuit the FDD Controller Circuit and the FDD Bus Driver Circuit The function of this circuit is to communicate with the FDD unit 370B Service Manual Maintenance Maintenance This section of the manual contains information for performing preventive maintenance troubleshooting and corrective maintenance for the 370B Programmable Curve Tracer Preventive Maintenance Cabinet Removal A Cleaning A 370B Service Manual Preventive maintenance when performed on a regular basis can prevent instrument breakdown and may improve the reliability of the instrument The severity of the environment to which the instrument is subjected will determine the frequency of maintenance A conven
203. rical specifications are checked Each step with instructions for checking and or adjusting instrument characteris tics has a title bar positioned over the step title The title bar contains a and or a T to quickly identify the purpose of the step Specifications All steps that check specifications list those specifications immediately after the step title Setup Conditions Each step has setup conditions enclosed in a box which include all equipment connections and control settings necessary to begin the step Performance Verification Performance Check Summary 5 4 Parts of Steps Each step is composed of sequential parts with alphabetic indexing The parts are arranged into functional groups so that for instance if a performance check is being performed adjustment instructions may be skipped Table 5 2 lists key characteristics checked in this procedure and the steps in which they are checked Also listed are steps containing adjustment instructions which may affect a characteristic s specified performance The specifications for characteristics listed in Table 5 2 are given at the beginning of the procedure step in which they are checked Table 5 2 Performance Check Summary Characteristic Adjusted Collector Supply POLARITY Not Specified examined in G5 LEAKAGE Not Specified examined in G5 DC Not Specified examined in G5 QO Not Specified examined in G5 AC Not Specified examined in G5 UJ Not Specif
204. rification Using Procedure 370B Service Manual The following aids are used in this procedure Performance Check Summary The Performance Check Summary lists key characteristics checked in the procedure and the procedure steps in which they are checked It also indicates which steps contain adjustments which may affect the specified performance of characteristics Power Up Sequence The Power Up Sequence ensures that operating conditions are stable and repeatable and must be performed before any complete or partial procedure is performed Initializing the 370B The 370B is initialized at the beginning of most the 370B procedure steps to prevent the carry over of inappropriate setup conditions from previous steps Initialization also allows each step to be performed independently if only portions of the procedure are performed Subsection Headings The procedure is divided into subsections by major circuit function For example A Power Supply B CRT etc Each subsection contains steps to check or adjust characteristics of that major circuit Step Titles and Title Bars The title of each step begins with checking adjusting or examining or a combination of these words m Checking indicates that an electrical specification is checked m Adjusting indicates that instructions are given to make one or more internal adjustments m Examining indicates that a functional check of the circuit is performed and that no elect
205. rnate Method 10 Change the following 370B and Test Equipment settings STEP GENERATOR Off POLARITY INVERT STEP AMPLITUDE 100 mA Digital Multimeter Mode Volts 11 Connect a 0 025 Q Resistor between the Left Base jack and the Left Emitter jack E and connect the Digital Multimeter to the leads of the Resistor as shown in Figure 5 7 370B Service Manual 5 95 Performance Verification Digital Multimeter Ln To Left Base Sg s To Left Emitter 0 1 4W Resistor Figure 5 7 Checking for Maximum Current Output of 100 mA and 200 mA range Checking 100 mA 12 Simultaneously press the FAST SHIFT and left Position Control buttons to move the displayed spot to the left most graticule line Change the following 370B settings LEFT RIGHT STANDBY LEFT Protective Cover Closed MEASUREMENT Press the REPEAT button several times to move the displayed spot to the right most graticule line 13 CHECK that the Digital Multimeter readout is 49 175 mV to 50 825 mV Checking 100 mA 14 Change the following 370B settings STEP GENERATOR On POLARITY INVERT STEP AMPLITUDE 100 mA 15 Simultaneously press the FAST SHIFT and right Position Control buttons to move the displayed spot to the right most graticule line 16 CHECK that the Digital Multimeter readout is 50 825 mV to 49 175 mV 5 96 370B Service Manual Performance Verification 370B Service Manual Removing the Setup 17 Ch
206. rol Table 5 13 OFFSET Voltage STEP AMPLITUDE Digital Multimeter Reading Max OFFSET 100 mV 1019 mV to 981 mV 1V 10 18 V to 9 82 V Removing the Setup 6 Change the following 370B setting LEFT RIGHT STANDBY STANDBY 7 Remove the digital multimeter leads from the 370B 5 80 370B Service Manual Performance Verification F5 Checking OFFSET 1 Accuracy in CURRENT TN Mode Specifications W Absolute Accuracy is less than 1 5 of the total output 3 6 of the STEP AMPLITUDE setting 1 nA Digital Multimeter To Left Base 370B settings Initialize the 370B then set the following controls as indicated DISPLAY VERTICAL CURRENT STEP GEN STEP GENERATOR Mode CURRENT STEP AMPLITUDE 200 nA OFFSET AID 2000 nA NUMBER OF STEPS 0 POLARITY INVERT ON OUTPUTS ENABLED LEFT RIGHT STANDBY LEFT Protective Cover Closed Test Equipment Settings 2 Digital Multimeter Mode DC Current NOTE Before checking these parameters note the count error of the Digital Multimeter and subtract it from the reading obtained in the procedure Use a TEKTRONIX DM501A for measuring the 200 mA range 370B Service Manual 5 81 Performance Verification Checking Maximum OFFSET with INVERT 1 CHECK that the Digital Multimeter measurement is within the limits shown in Table 5 14 under Maximum OFFSET for each setting of the STEP AMPLITUDE control Table 5 14 OFFSET Current STEP AMPLITUDE Digita
207. rse order of removal A22 Interface Circuit Board Remove and replace the A22 Interface circuit board as follows 1 Remove the A2 CPU and the A3 A D circuit boards See the A2 A3 A4 and A5 Plug in Circuit Board removal instructions 2 Remove the connector for J220 from the A1 Mother circuit board 3 Remove the four screws that secure the IEEE STD 488 PORT connector and the PRINTER INTERFACE PORT connector to the rear panel 370B Service Manual 4 17 Maintenance 4 Remove the rear panel See the Rear Panel Removal instructions 5 Remove the A22 Interface circuit board and its plastic insulation cover by removing the four securing screws from the board 6 Replace the A22 Interface circuit board in the reverse order of removal A23 FDD Interface Circuit Board Remove and replace the A23 FDD Interface circuit board as follows 1 Pull out the drawer unit from the main body of the 370B 2 Remove the connector for J100 from the A13 Key Interface circuit board 3 Remove the connector through the W200 on the A23 FDD Interface circuit board from the FDD assembly 4 Remove the A23 FDD Interface circuit board by removing the four securing screws from the board 5 Replace the A23 FDD Interface circuit board in the reverse order of removal A27 Primary Circuit Board Remove and replace the A27 Primary circuit board as follows 1 Remove the rear panel See the Rear Panel Removal instructions 2 Remove th
208. rts list Cont Fig amp index Tektronix part Serialno Serial no Mfr number number effective discontd Qty description code Mfr part number 26 212 0507 XX 8 SCREW MACHINE 10 32 X 0 375 PNH STL 0435 MACHINE SCREW 27 210 1003 8 WASHER FLAT 0 2 ID X 0 438 OD X 0 036 BRS 12327 ORDER BY DESC END ATTACHING PARTS 28 260 2323 00 1 SWITCH PUSH DPST 15A 250V ON OFF 5100 80009 260232300 ATTACHING PARTS 29 211 0751 XX 2 SCR ASSEM WSHR M3 X 8 80009 2110751 END ATTACHING PARTS 30 174 0327 00 1 CA ASSY SP ELEC 2 18 AWG 7 0 L W270 80009 174032700 81 196 3110 00 1 LEAD ELECTRICAL 18 AWG 7 0 L 8 0 W16 80009 196311000 32 196 3111 00 1 LEAD ELECTRICAL 18 AWG 7 0 L 8 9 W18 80009 196311100 33 386 5485 XX 1 PLATE CONN MTG FEMALE STEEL 80009 3865485 ATTACHING PARTS 34 211 0507 XX 2 SCREW MACHINE 6 32 X 0 312 PNH STL 0435 ORDER BY DESC END ATTACHING PARTS 35 174 0296 00 1 CA ASSY SP ELEC 34 28 AWG 5 5 L RIBBON W400 80009 174029600 ATTACHING PARTS 36 211 0661 XX 2 SCR ASSEM WSHR 4 40 X 0 25 PNH STL TK0435 ORDER BY DESC END ATTACHING PARTS 37 198 5714 00 1 WIRE SET ELEC 370B W D SUB CONN W490 80009 198571400 ATTACHING PARTS 38 211 0661 XX 2 SCR ASSEM WSHR 4 40 X 0 25 PNH STL TK0435 ORDER BY DESC END ATTACHING PARTS 39 386 5909 XX 1 PLATE CONN MTG FEMALE STEEL 80009 3865909XX ATTACHING PARTS 40 211 0507 XX 2 SCREW MACHINE 6 32 X 0 312 PNH STL TK0435 ORDER BY DESC END AT
209. rument rack OptionD1 calibration data test result report will be provided with the 370B Program mable Curve Tracer when this option is specified Option A9 370B Programmable Curve Tracer comes without the power cord 370B Service Manual 6 1 Options and Accessories Accessories Standard Accessories 370B Programmable Curve Tracer includes the standard accessories listed in Table 6 1 Table 6 1 Standard accessories Accessory Part number User Manual English 070 A838 XX Fuse 250 V 2 A Medium blow 159 0260 00 125 V 4 Medium blow 159 0259 00 Protective Cover 337 3344 02 Utility Software FDD 063 3341 XX Power Cord 161 0066 00 Test Adapters Blank Adapter 1001 In line Adapter A1002 Axial Lead Adapter A1005 Optional Accessories The following optional accessories listed in Table 6 2 are recommended for use with the instrument Table 6 2 Optional accessories Accessory Part number Service Manual 070 A842 XX Test Adapter TO 3 TO 66 Adapter A1003 4 and 6 Lead Transistor Adapter A1007 4 and 6 Lead FET Adapter A1009 IC Adapter A1010 SOT23 SMD Adapter A1023 GPIB Cable 2m 012 0991 00 Rack Mount Kit 016 0930 00 Cart K475 This appendix describes the various options as well as the standard and optional accessories that are available for the 370B Programmable Curve Tracer 6 2 370B Service Manual Options and Accessories Recommended Accessories 370B Service Manual The following
210. s limit the following adjust ment is necessary 8 ADJUST the Step Generator Offset adjustment R360 on the A3 A D board for 0 mV of Digital Multimeter reading Removing the Setup 9 Disconnect the Digital Multimeter from 370B 5 73 Performance Verification Ge F2 Adjusting Step nerator Zero A7R310 Current Amplifier Bias A7R467 Current Zero 5 74 A7R603 NOTE The characteristic examined in this step is provided as an example of typical instrument operation to aid in the adjustment of R310 R467 R603 it is not a specification 370B settings Initialize the 370B then set the following controls as indicated COLLECTOR SUPPLY AC POLARITY STEP GENERATOR VOLTAGE On STEP AMPLITUDE 500 mV NUMBER OF STEPS 0 MAX X10 On DISPLAY Mode NON STORE HORIZONTAL 5 mV BASE EMITTER OUTPUTS ENABLED Protective Cover Closed Examining and Adjusting for Zero Output Volts 1 EXAMINE that the spot moves within 0 5 divisions between the 500 mV and 200 mV of STEP AMPLITUDE setting If the spot is not within this limit the following adjustment is necessary 370B Service Manual Performance Verification 370B Service Manual 2 Set the STEP AMPLITUDE to 200 mV then note the spot position 3 Set the STEP AMPLITUDE to 500 mV 4 ADJUST SG ZERO adjustment R310 on the A7 Step Generator Board to the noted position of part 2 Adjusting for Current Amplifier Bias 5 Set the following 370B and Test Eq
211. s that carry the Step Generator signal and Collector Supply to the Test Fixture Adapter Jacks Test Oscilloscope ToLEFT BASE To 370B Ground Jack 370B settings Initialize the 370B then set the following controls as indicated STEP GENERATOR Mode VOLTAGE STEP AMPLITUDE 2V LEFT RIGHT STANDBY LEFT OUTPUTS ENABLED Protective Cover Closed 370B Service Manual Performance Verification 370B Service Manual Test Equipment Settings Test Oscilloscope Vertical Sensitivity 5 DC Horizontal 10 ms div Trigger Mode Auto Trigger Slope Examining Internal Operation for LEFT 1 EXAMINE the test oscilloscope display for a step waveform 2 Change the following 370B setting LEFT RIGHT STANDBY STANDBY 3 EXAMINE the test oscilloscope for no step waveform display A small waveform may be displayed by stray capacitance Examining Internal Operation for RIGHT 4 Connect the test oscilloscope between the RIGHT B BASE and ground jacks and close the protective cover 5 EXAMINE the test oscilloscope for no step waveform display A small waveform may be displayed by stray capacitance 6 Change the following 370B setting LEFT RIGHT STANDBY RIGHT 7 EXAMINE the test oscilloscope for a step waveform to be displayed Examining External Base Input 8 Change the following 370B setting CONFIGURATION BASE OPEN EXT 9 EXAMINE the test oscilloscope for no step waveform display 10 Use a patch cord
212. short pulseor long The number of steps is in the case of 3 gt PULSED OFFSET PULSED OFFSET MODE TIME 370B Service Manual 3 7 Theory of Operation Collector Supply Generator lt 4b gt Acquisition lt 5 gt Display Counter Circuit lt 6 gt 3 8 DC Offset Base line offset voltage is always applied to the DUT in spite of Step Generator mode and the Measurement Mode setting The number of steps is in the case of 3 VOLTAGE or CURRENT DC OFFSET MODE TIME The Collector Supply Generator Circuit located on the A3 A D board consists of a Sine Wave Timing Generator Sine Wave Generator Collector Level Control Circuit and High Voltage Sine Wave Attenuator Circuit These circuits generate a sine wave synchronized to the line frequency which is the source of the Collector signal The Acquisition Circuit located on the A3 A D Board consists of an S H Sample and Hold and Select Circuit A D Circuit A D Timing Circuit Acquisition Memory Control Circuit Acquisition Memory Circuit and Bus Interface Circuit These circuits perform A D conversion of the HD and VD signals from the A5 Display Control Board write them into Acquisition memory and transfer data to the CPU The Display Counter Circuit is located on the A4 Digital Display Board The Display Counter Circuit consists of the Bus Buffer the 4 5 MHz Oscillator Display Counter Address Switch amp CPU Control Display RAM Bus Trans ceiv
213. ss the REPEAT button to move the spot 1 division to the right 4 Record the value of the digital multimeter reading 5 CHECK the reading value for Step 1 differs from the reading value for Step0 within 200 mV 3 mV Checking Steps 2 through 10 6 CHECK that for each time the spot is advanced 1 division with the MEASUREMENT REPEAT button 7 Record the value of the digital multimeter reading 8 CHECK the voltage difference from the previous reading are within 200 mV 3 mV NOTE If steps F8 F9 and F10 will not be performed complete the instructions given under Replacing the Store Non Store Jumper at the end of Step F10 before proceeding to another step or ending the procedure 370B Service Manual Performance Verification F8 Checking Step Incremental Accuracy in CURRENT Mode 370B Service Manual Specifications m Incremental Accuracy is 1 5 NOTE If previous step was not performed complete the instruction given under Moving the Store Non Store Jumper at the beginning of Step F6 before proceeding with this step Digital Multimeter To Left Base 370B settings Initialize the 370B then set the following controls as indicated DISPLAY Mode NON STORE VERTICAL CURRENT STEP GEN COLLECTOR SUPPLY DC POLARITY STEP GENERATOR Mode CURRENT STEP AMPLITUDE 200 mA NUMBER OF STEPS 10 LEFT RIGHT STANDBY LEFT OUTPUTS ENABLED Protective Cover Closed Test Equipment Settings Dig
214. steps most adjustments are preceded by instructions for determining whether adjustment is necessary and followed by instructions for verifying that the adjustment was correctly performed Perform the Power Up Sequence at the beginning of the Performance Check and Adjustment Procedure Perform all steps in the procedure with T or a or both in the bar above the step title see the Procedure Index at the beginning of the procedure NOTE Steps for Examining characteristics only i e those with no Checking or Adjusting instructions included are not necessary for checking specifications or making adjustments Perform the Power Up Sequence at the beginning of the Performance Check and Adjustment Procedure Perform the desired steps e g A1 B3 etc using the SETUP CONDITIONS at the beginning of each step Perform the First Time Operation procedure in the 370B User Manual Perform the Power Up Sequence at the beginning of the Performance Check and Adjustment Procedure Perform only those steps with titles beginning with Checking or Examining NOTE If a Checking or an Examining step also contains the word Adjusting in the title and a 7 in the bar above the title ignore those parts of the step with adjustment instructions Before making adjustments thoroughly clean and inspect the 370B instrument as instructed in the Maintenance section of this manual 370B Service Manual Performance Ve
215. t board 15 Replace the A10 Sense circuit board and the A13 Key Interface circuit board in the reverse order of removal NOTE When troubleshooting the 10 Sense circuit board below the 13 Key Interface 13 Key Interface circuit board can be used to stand by connecting on the 13 Key Interface circuit board with 7131 on the A10 Sense circuit board 11 Main Key Circuit Board Remove and replace the 111 Main Key circuit board as follows 1 Remove the CRT bezel from the front panel See step 5 of the Cathode Ray Tube Removal instructions 2 Remove the right cabinet panel from the main body 3 Remove the two securing screws from the right side of the front panel and pull out the front panel 4 Remove the connector for J110 from the A1 Mother circuit board and remove the screw holding the ground wire lug Then remove the front panel 5 Pull out the eight knobs three large and five small from the front panel 6 Remove the A11 Main Key circuit board by removing the six screws securing the board 370B Service Manual Maintenance A 370B Service Manual NOTE A11 Main Key circuit board and A12 Sub Key circuit board are connected to one another by circuit board mounted connectors J100 J120 P100 and P120 Be careful not to damage the connectors when removing and replacing the board 7 Replace the A11 Main Key circuit board in the reverse order of removal A12 Sub Key Circuit Board
216. ted Warning Indicator Red light indicates dangerous voltage is applied to collector or base terminal Limiting indicator Indicates that internal sensing circuit automatic protection is operating Looping compensation Range At least 100 pF Cancels stray capacitance between DUT terminal and ground 370B Service Manual 1 5 Specifications Table 1 1 Collector Supply Cont Characteristic Performance Requirement Operating Information Sweep start Voltage Accuracy Applicable to FULL WAVE mode Due to stray capacitance between collector and ground terminals zero volt error may occur because of charged offset voltage 16 80 400 V range 2 of MAX Peak Voltage 2000 V Range 15 of MAX Peak Voltage Thermal cutoff typical Operating Temperature 70 C 28 C For Collector Supply Amplifier and Series Resistors Current limit Operating Point At least 2 0 A 1 2 A and 0 2 A of primary Depends on Vertical and Max Peak Volts current of collector transformer settings Voltage limit Operating Point 50 25 5 of Max Peak Volts Depends on Horizontal and Max Peak Volts settings Arc Killer Collector supply is disabled at least one cycle while the relays or switches are operated Output Control Circuit Breaker mounted on the front panel enables and disables Collector supply Step Generator and AUX source No trip for 1 5 A of Collector Transformer primary current 100 rating of circuit breaker Trip occurs betwe
217. terface Circuit and the Vertical Sense Circuit The interlock Circuit protects this board from generating arcs overheating and operation when the cover is open The Sense Board Interface Circuit interfaces this board with the A2 CPU board The Vertical Sense Circuit compensates for looping senses and amplifies collector emitter and base current This circuit consists of the Collector Voltage Sense Circuit the Base Voltage Sense Circuit Overrun Detector Circuit the Horizontal Amplifier circuit and the Timer Circuit It measures either collector or base voltage of the device under test and eliminates transient voltage on the Collector or Base Terminal This circuit is located on the A13 Key Interface board and consists of the Bus Buffer Circuit the Address Decoder Circuit the Rotary Encoder Circuit the Status Port Circuit and Lower Panel Key and Display Circuit These circuits interface signals with the A2 CPU board set up VARIABLE COLLECTOR SUPPLY settings transfer the status data to the A2 CPU board control the lower panel LED displays and transfer the key input data from the lower panel keys This circuit is located on the 11 Main Key board and consists of the Bus Buffer Circuit the Address Decoder Circuit the Variable Control Circuit and the Switch Matrix Circuit These circuits interface signals between the A2 CPU 370B Service Manual Theory of Operation Front Panel LED amp Key lt 17 gt Configuration LED lt
218. than 1 5 of total output 3 x STEP AMPLITUDE setting 1 mV or 1 nA Less than 1 5 of total output 10 x STEP With 1X STEP MULTI pressed AMPLITUDE setting 1 mV or 1 nA Variable from 10 to 10 times STEP AMPLITUDE STEP AMPLITUDE setting x 1 Within 3 of collector peak volts including Polarity is in AC mode jitter 50 nA to 200 mA in a 1 2 5 sequence of 21 steps 20 x STEP AMPLITUDE setting except 10 x Steps and aiding offset STEP AMPLITUDE when control is set to 200 mA At least 10 V Steps and aiding offset 1 Maximum opposing offset current 10 x STEP AMPLITUDE Maximum opposing volts Less than 15 V When the voltage limiter is working in opposing current setting condition the step generator output current value is not guaranteed Ripple plus noise Less than 0 5 x STEP AMPLITUDE BW 20 MHz with open circuit 10 nA Output impedance typical Fall and rise time typical Overshoot and undershoot typical 370B Service Manual More than 1 0 3 of STEP AMPLITUDE current setting per volt Within 25 us for 1 step or 100 us for 10 1 kQ load 100 uA step steps Within 1096 of transition amplitude 1 load 100 uA step 1 7 Specifications Table 1 2 Step Generator Cont Characteristic Voltage Mode Amplitude switch range Maximum voltage Maximum current Short circuit current limiting Maximum opposing offset volts Maximum opposing current Ripple plus
219. the CPU Circuit The Digital Display Circuit converts digital data into analog display signals This digital data includes stored curve and operating information The Display circuit selects store or non store data and displays curves and 370B operating information The Data Acquisition and Display Circuits consist of the following Acquisition Circuit Display Counter Circuit Display D A Converter Circuit Display Offset Circuit Display Select Circuit Vertical Sense Circuit Sense Board Interface Circuit Horizontal Sense Circuit CRT Output Circuit H V Power Supply Circuit 370B Service Manual Theory of Operation Control and Processing These circuits control the 370B and process acquired data They include the CPU Circuit the Front Panel Circuit and Floppy Disk Circuit The CPU Circuit controls an operations of the 370B including Collector Supply and Step Generator Control Sense Circuit Control CRT Display Control Front Panel Control Floppy Disk Control etc The circuit also processes the acquired data from the device under test These operations are controlled by the micropro cessor and its operating programs through the Address Data and Control Bus lines The Front Panel Circuit interfaces the operator to the 370B This circuit reads keys switches and rotary encoder information to set the 370B to the desired measurement condition This also displays these settings to the operator by LED and numerical displays
220. the setting 1 nA To Left BASE 370B settings DC Voltage Source To 370B Ground jack To EXT BASE or EMITTER To Left EMITTER Initialize the 370B then set the following controls as indicated COLLECTOR SUPPLY POLARITY DISPLAY HORIZONTAL VERTICAL CURSOR POSITION MODE OFFSET CONFIGURATION OUTPUTS LEFT RIGHT STANDBY Protective Cover Test Equipment setting Calibrator Output 5 60 LEAKAGE 500 V COLLECTOR 1 EMITTER DOT DISPLAY HORIZONTAL 1 0 DIV BASE OPEN EXT ENABLED LEFT Closed 0 000 V 370B Service Manual Performance Verification Checking 1 nA 1 CHECK that the vertical CURSOR readout is within the limits listed in Table 5 8 for each combination of VERTICAL CURRENT DIV and Calibrator settings Checking 20 nA 2 CHECK that the vertical CURSOR readout is within the limits listed in Table 5 8 for each combination of VERTICAL CURRENT DIV and Calibrator settings Checking 500 nA 3 CHECK that the vertical CURSOR readout is within the limits listed in Table 5 8 for each combination of VERTICAL CURRENT DIV and Calibrator settings Removing the Setup 4 Change the following 370B setting LEFT RIGHT STANDBY STANDBY 5 Disconnect the voltage source from the 370B Table 5 8 Emitter Current Accuracy VERTICAL Vertical CURSOR CURRENT DIV Setting Voltage Current Value Readout 1 nA shunt resistor 25MQ 0 00 1 05 nA 9nA 7 82nA to 10 18 nA 20 nA shunt resist
221. tion in the Diagrams section and on the mechanical exploded views in the Replaceable Mechanical Parts list section The component number is obtained by adding the assembly number prefix to the circuit number see Component Number illustration following this table The electrical parts list is arranged by assemblies in numerical sequence A1 with its subassem blies and parts precedes 2 with its subassemblies and parts Chassis mounted parts have no assembly number prefix and they are located at the end of the electrical parts list 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 entry indicates the part is good for all serial numbers 5 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 6 Mfr Code This indicates the code number of the actual manufacturer of the part 7 Mfr Part Number This indicates the actual manufacturer s or vendor s part number 7 2 370B Service Manual Electrical Parts List Abbreviations Component Number List of Assemblies Chassis Parts Mfr Code to Manufacturer Cross Index
222. to aid in the adjustment of R332 R360 it is not a specification 370B settings Initialize the 370B then set the following controls as indicated COLLECTOR SUPPLY POLARITY STEP GENERATOR Mode STEP MULTI 1X STEP AMPLITUDE NUMBER OF STEPS MAX X10 DISPLAY HORIZONTAL AC VOLTAGE On 200 mV 0 On 5 mV BASE EMITTER 5 71 Performance Verification 5 72 OUTPUTS ENABLED Protective Cover Closed Examining and Adjusting for Zero Output Volts 1 Note the horizontal spot position 2 Change the following 370B setting STEP GENERATOR STEP MULTI 1X Off 3 EXAMINE that the spot moves within 1 divisions from the noted position of step 1 If the spot is not within this limit the following adjustment is necessary 4 ADJUST 1X Balance adjustment R332 on the A3 A D board for minimum horizontal display shift when STEP MULTI 1X is set between On and Off Examining and Adjusting for Step Generator Offset 5 Set the following Test Equipment setting Digital Multimeter Mode DC Volts 6 Connect the Digital Multimeter between the TP310 SG and the TP 500 A GND on the A3 A D board as shown in Figure 5 4 370B Service Manual Performance Verification 370B Service Manual To A3TP310 Digital Multimeter Figure 5 4 Examining and Adjusting for Step Generator Offset 7 EXAMINE the Digital Multimeter for reading of 0 mV 1 mV If the Digital Multimeter reading is not within thi
223. to provide cable clearance The depth of the 370B from behind the rack ears to the rear panel is 480mm 18 9 in The rack depth must be at least 559 mm 22 in see Figure 2 4 to meet the rear clearance requirement L4 FROM BACK OF RACK EARS gt TO FARTHEST POINT ON REAR PANEL 4 RACK DEPTH 22 b l Figure 2 4 Rackmounting Length and Clearance The 370B is 312 mm 12 25 in high a multiple of 45 mm 1 75 in the standard rack spacing If the 370B is installed in a rack with standard hole spacing and positioned some multiple of 45 mm 1 75 in from the bottom or top all holes should line up and no drilling should be required 370B Service Manual Getting Started The slide out tracks mount easily to the rack front and rear vertical mounting rails if the inside distance between the rails is within 503 mm 19 8 in to 674 mm 26 5 in If the tracks are to be installed in a rack having other dimensions provide extra support for example extensions to the rear mounting brackets for the rear ends of the slide out tracks The front rack rails must be at least 17 inches apart The front lip of the stationary track section mounts in front of the rail Use bar nuts behind untapped front rails The front lip of the stationary track section must mount in front of the front rail to allow the 370B spring latch to function properly The slide out tracks consist of
224. ton to move the displayed waveform to center graticule 2 Set the front panel LOOPING COMPENSATION to minimum looping 3 CHECK that vertical width of the displayed waveform is within the limits 5 mA 5 div at the 100 of VARIABLE COLLECTOR SUPPLY setting Checking Collector Vertical Displayed Noise in CONFIGURATION BASE to COLLEC TOR SUPPLY mode 4 Change the following 370B setting CONFIGURATION BASE COLLECTOR SUPPLY 5 Set the front panel LOOPING COMPENSATION to minimum looping 6 CHECK that vertical width of the displayed waveform is within the limits given in Table 5 11 for each combination of settings for the MAX PEAK VOLTS and the HORIZONTAL VOLTS DIV controls with the 100 of VARIABLE COLLECTOR SUPPLY setting Table 5 11 Displayed Vertical Collector Noise in CONFIGURATION BASE to COLLECTOR SUPPLY mode COLLECTOR SUPPLY MAX HORIZONTAL COLLECTOR Vertical width of the PEAK VOLTS VOLTS DIV Setting waveform 16 2 VIDIV 1 uA 1 div 80 10 V DIV 1 uA 1 div 400 50 V DIV 2 uA 2 div 370B Service Manual Performance Verification Step Generator F1 Adjusting 1X Balance A3R332 and Step Generator Offset A3R360 370B Service Manual Equipment Required see Table 5 3 m Digital Multimeter m Resistor 1 MQ 5 0 5 W m Resistor 100 Q 5 0 5 W m Resistor 0 025 0 1 4 W NOTE The characteristic examined in this step is provided as an example of typical instrument operation
225. tton enters the Users Initiated Diagnostic routine This routine displays a number or message that corresponds to the front panel push button or rotary switch pressed or rotated Thus you can diagnose whether the front panel controls are operating normally Table 4 2 lists the buttons switches and associated messages To exit this routine press both the FAST SHIFT button and the Position DISPLAY button again GPIB Diagnostic Routine The GPIB TEST command initiates the 370B boot ROM and RAM diagnostic routines The 370B responds to this command by returning boot ROM and RAM information to the controller in the following format TEST ROM 000X ROM error code RAM YYYY RAM error code Maintenance The TEST query response consists of two hexadecimal numbers that indicate if a ROM or RAM IC was found to be defective These numbers must be translated to the binary equivalent to determine the ROM and RAM locations If an ROMs and RAMs are good the TEST query response is 0000 RAM 0000 4 28 370B Service Manual Performance Verification G Performance Verification 370B Service Manual The Performance Check and Adjustment Procedure m Checks key electrical specifications m Provides instructions for determining whether adjustment is necessary m Provides instructions for making all internal adjustments m Provides optional functional check instructions Adjustment Interval To maintain instrument accuracy check p
226. ual The 370B incorporates a spring latch design built into the rackmounting ear To release pull the rackmount latch release see Figure 2 2 To relatch push the rackmount latch release until the spring latches engage For those applications that require additional rackmounting security the rackmounting ears of the 370B are drilled for screw fasteners see Figure 2 2 LATCH RELEASES Figure 2 2 Location of the Rackmount Latch Release The 370B fits most commercial consoles and 19 inch racks with rail holes that conform to universal spacing See Figure 2 3 for hole spacing details WARNING The 370B weighs more than 36Kg 80 Ib To avoid personal injury use care when lifting the instrument and where required seek help in lifting and positioning the 370B into the rack Once the 370B is installed in a rack use care that when extended the 370B does not tip the rack forward causing personal injury or instrument damage 2 7 Getting Started 2 8 MIL STD 189 UNIVERSAL SPACING SPACING EIA RS 310 RETMA 12 250 NOMINAL 12 205 ACTUAL BASELINE 078 NOM RACK CLEARANCE Figure 2 3 Rackmount hole spacing When rackmounting the 370B take note of the following Allow one inch clear ance above and below and on the left and right sides of the 370B for air circula tion Allow at least three inches of clearance between the 370B rear panel and the rack enclosure for adequate cooling air and
227. uding the common terminal that exceeds the maximum rating of that terminal Do Not Operate Without Covers Do not operate this product with covers or panels removed Use Proper Fuse Use only the fuse type and rating specified for this product Avoid Exposed Circuitry Do not touch exposed connections and components when power is present Do Not Operate With Suspected Failures If you suspect there is damage to this product have it inspected by qualified service personnel 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 vii General Safety Summary viii Symbols and Terms A A 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 follow
228. uipment settings STEP GENERATOR Mode CURRENT Digital Multimeter Mode DC Volts 6 Connect the Digital Multimeter across R491 on the A7 Step Generator Board as shown in Figure 5 5 Digital Multimeter Measure across 7 491 Figure 5 5 Adjusting for Current Amplifier Bias 7 ADJUST BIAS adjustment R467 on the 7 Step Generator Board for a Digital Multimeter reading of 6 mV This adjustment sets bias current to the optimum level for long term reliability Removing the Setup 8 Disconnect the Digital Multimeter from R491 5 75 Performance Verification Checking and Adjusting for Zero Output Current 9 Connect the 100 Q resistor to the Left Base and Left Emitter jacks then close the protective cover 10 Change the following 370B settings DISPLAY HORIZONTAL 100 mV BASE EMITTER STEP GENERATOR STEP AMPLITUDE 100 mA LEFT RIGHT STANDBY LEFT 11 Note the horizontal position of the spot 12 Change the following 370B settings DISPLAY HORIZONTAL 50 mV BASE EMITTER STEP GENERATOR STEP AMPLITUDE 50 mA 13 EXAMINE that the spot moves within 0 5 divisions between the setting of part 10 and 12 If the spot is not within this limit the following adjustment is necessary 14 ADJUST Current Zero adjustment R603 on the A7 Step Generator Board to move the spot one half over the noted position of part 11 15 If necessary repeat steps 10 through 14 Removing the Setup 16 Remove the 100 Q res
229. ulated operating conditions The 370B consists of five major functional sections Collector Supply Data Acquisition and Display Control and Processing Interface Power Supply 3 1 Theory of Operation 3 2 Stimulus Generators The Stimulus Generators simulate operating conditions for the DUT by producing voltages and currents that are applied to the DUT They include the Collector Supply the Step Generator the Aux Supply and the PLL and Clock Circuits The Collector Supply produces sine wave ac full wave rectified sine waves positive and negative and positive and negative DC voltages The amplitude of the output can be varied from 0 to 2000 volts The Collector Supply output is applied to either the collector or the base or equivalent terminal of the device under test The Step Generator Circuit produces ascending or descending steps of current or voltage at a normal rate of one step for each half sine wave of the Collector Supply The amount of current or voltage per step total number of steps and offset voltage and current can be controlled This Step Generator output may be applied to either the base or the emitter or equivalent terminals of the device under test The Auxiliary Supply produces auxiliary power for the DUT The output voltage range is 0 to 40 volts This output can be applied to any terminal of the DUT 370B Service Manual Theory of Operation AUX SUPPLY FRONT PANEL OBO OD Figur
230. ures 370B Service Manual Preface 370B Service Manual xiii Preface Xiv 370B Service Manual Introduction This manual contains information needed to properly service the 370B Program mable Curve Tracer as well as general information critical to safe and effective servicing To prevent personal injury or damage to the analyzer consider the following before attempting service m The procedures in this manual should be performed only by a qualified service person m Read the General Safety Summary and the Service Safety Summary beginning on page vii m Read Preparation for Use in section 2 Operating Information When using this manual for servicing be sure to follow all warnings cautions and notes Performance Check Interval Strategy for Servicing 370B Service Manual Generally the performance check described in section 4 Performance Verification should be done every 12 months In addition performance check is recommended after module replacement If the analyzer does not meet performance criteria repair is necessary Throughout this manual the term module refers to any field replaceable component assembly or part of the analyzer This manual contains all the information needed for periodic maintenance of the 370B Programmable Curve Tracer Examples of such information are procedures for checking performance Further it contains all information for corrective maintenance down to the module
231. y other type of cleaner consult your Tektronix Service Center or representative 4 1 Maintenance 4 2 A Visual Inspection Exterior Loose dust accumulated on the outside of the instrument can be removed with a soft cloth or small brush The brush is particularly useful for dislodging dirt on and around the front panel controls Dirt that remains can be removed with a soft cloth dampened in a mild detergent and water solution Abrasive cleaners should not be used CRT Clean the plastic light filter implosion shield and the CRT face plate with a soft lint free cloth dampened with denatured alcohol Interior Cleaning the interior of the instrument should only be occasionally necessary The best way to clean the interior is to blow off the accumulated dust with dry low velocity air approximately 5 Ibs sq in Remove any dirt that remains with a soft brush or a cloth dampened with a mild detergent and water solution A cotton swab is useful for cleaning in narrow spaces or for cleaning more delicate circuit components CAUTION Circuit boards and components must be dry before applying power to prevent damage from electrical arcing The high voltage circuits should receive special attention Excessive dirt in this area may cause high voltage arcing and result in improper instrument operation The 370B should be inspected occasionally for such defects as broken connec tions improperly seated semiconductors damaged

370B Programmable Curve Tracer Service Manual

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