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TM 11-6625-3145-14
Verification and Adjustment Procedures-318/338 Service
3. ADJUST THRESHOLD VOLTAGES ON THE A05 ROM BOARD
Equipment Required
1 Digital Multimeter (DMM)
Reference Voltage Adjustment
1. Make sure that all four P6451 Parallel Data Probes are installed.
2. Set the DMM range to measure about 5V dc.
3. Connect the DMM minus (-) lead to the GND test point on the A05 ROM board.
4. Connect the DMM plus (+) lead to TP64 (REF) on the A05 ROM board.
5. Adjust REF ADJ R064 on the A05 ROM board for a DMM indication of 3.200
±
0.010V.
Threshold VA O-VOLT Adjustment
1. Press the THRESHOLD key (normal operating mode).
2. Set Threshold LEVEL V1 to 0.0 V.
3. Press the START key.
4. Move the DMM plus (+) lead to TP78 (V1/4) on the A05 ROM board.
5. Adjust VA O-VOLT ADJ R78 on the A05 ROM board for a DMM indication of 0.000
±
0.010 V.
6. Press the STOP key.
7. Set Threshold LEVEL V1 to +10.0 V.
8. Press the START key.
9. Check that the DMM reading is +2.500
±
0.010 V.
10. Press the STOP key.
11. Set Threshold LEVEL V1 to -10.0 V.
12. Press the START key.
13. Check that the DMM reading is -2.500
±
0.010V.
14. Press the STOP key.
Threshold VB 0-VOLT Adjustment
1. Set Threshold LEVEL V2 to 0.0 V.
2. Press the START key.
3. Move the DMM plus (+) lead to TP88 (V2/4) on the A05 ROM board.
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Summary of Contents for 318
Page 119: ...318 VERIFICATION AND ADJUSTMENT PROCEDURES ...
Page 182: ...338 VERIFICATION AND ADJUSTMENT PROCEDURES ...
Page 253: ...318 ___________________ TROUBLESHOOTING TREES ...
Page 344: ...338 TROUBLESHOOTING TREES ...
Page 517: ...TM 11 6625 3145 14 318 338 4434 923 318 Block Diagram ...
Page 518: ...TM 11 6625 3145 14 318 338 4434 924 338 Block Diagram ...
Page 519: ...TM 11 6625 3145 14 318 338 4434 925 318 Acquisition Module Wiring Diagram ...
Page 520: ...TM 11 6625 3145 14 318 338 4434 926 318 338 Mainframe Wiring Diagram ...
Page 521: ...TM 11 6625 3145 14 318 338 4434 926 338 Acquisition Module Wiring Diagram ...
Page 522: ...TM 11 6625 3145 14 318 338 4434 928 Figure 9 1 318 A01 Input A Board Component Locations ...
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Page 528: ...TM 11 6625 3145 14 Figure 9 3 318 338 A03 ACQ Control Board Component Locations ...
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Page 542: ...TM 11 6625 3145 14 Figure 9 8 318 338 A10 CRT Board Component Locations ...
Page 544: ...TM 11 6625 3145 14 Figure 9 9 318 338 A11 Inverter Board component Locations ...
Page 546: ...TM 11 6625 3145 14 Figure 9 10 318 338 A12 Regulator Board Component Locations ...
Page 551: ...TM 11 6625 3145 14 Figure 9 12 338 A01 Input A Board Component Locations ...
Page 553: ...TM 11 6625 3145 14 318 338 SERVICE ...
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Page 555: ...PIN 058584 ...