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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)
a.
Reference Voltage Adjustment
(1)
Connect the P6451 probes to PARALLEL DATA INPUTS A and B.
(2)
Set the DMM range to measure about 5 V 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 voltage indication of 3.200
±
.010 V.
b.
Threshold VA 0-VOLT Adjustment
(1)
Set Threshold LEVEL V1 to 0.0.
(2)
Press the START key.
(3)
Move the DMM plus (+) lead to TP78 (V1/4) on the A05 ROM board.
(4)
Adjust VA O-VOLT ADJ R078 on the A05 ROM board for a DMM indication of 0.000
±
0.010 V.
(5)
Press the STOP key.
(6)
Set Threshold LEVEL V1 to + 10.0 V.
(7)
Press the START key.
(8)
Check that the DMM reading is +2.500
±
0.010 V.
(9)
Press the STOP key.
(10)
Set Threshold LEVEL V1 to -10.0 V.
(11)
Press the START key.
(12)
Check that the DMM reading is -2.500
±
0.010V.
(13)
Press the STOP key.
c.
Threshold VB O-VOLT Adjustment
(1)
Set Threshold LEVEL V2 to 0.0.
(2)
Press the START key.
(3)
Move the DMM plus (+) lead to TP88 (V2/4) on the A05 ROM board.
(4)
Adjust VB O-VOLT ADJ R088 on the A05 ROM board for a DMM indication of 0.000
±
0.010 V.
(5)
Press the STOP key.
(6)
Set Threshold LEVEL V2 to + 10.0 V.
(7)
Press the START key.
(8)
Check the DMM reading is +2.500
±
0.010 V.
(9)
Press the STOP key.
(10)
Set Threshold LEVEL V2 to -10.0 V.
(11)
Press the START key.
(12)
Check the DMM reading is -2.500
±
0.010 V.
(13)
Press the STOP key.
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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 ...
Page 526: ...TM 11 6625 3145 14 ...
Page 528: ...TM 11 6625 3145 14 Figure 9 3 318 338 A03 ACQ Control Board Component Locations ...
Page 532: ...TM 11 6625 3145 14 ...
Page 536: ...TM 11 6625 3145 14 ...
Page 538: ...TM 11 6625 3145 14 ...
Page 539: ...TM 11 6625 3145 14 ...
Page 540: ...TM 11 6625 3145 14 ...
Page 541: ...TM 11 6625 3145 14 ...
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 ...
Page 554: ......
Page 555: ...PIN 058584 ...