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Page Title:
Table 2-6. Troubleshooting of Laser Power Supply Control C-9135/VVG-1 (A77)--Continued |
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 TM 9-1240-369-34
Table 2-6. Troubleshooting o/ Laser Power Supply Control C-9135/VVG-1 (A77)-Continued
Item
No.
Malfunction
Probable cause
Corrective action
2
RANGE (METERS) indicator
unit A79 does not display
20. Using multimeter, measure voltage at
correct readout-continued-
pins 14 and 15 of A77A4 card. If
multimeter indicates +1 5.0 .0.7 V and
+4.0 1.5 V. respectively, continue
with step 30. If multimeter does not
indicate +15.0 0.7 V and +4.0 .1.5 V
respectively, continue with step 21.
21. Disable interlock switch S1 on chassis.
22. Remove A7 A2 card (para 3-5c).
23. Install extender card (12, table 2-2).
24. Insert A; A2 card into extender card
connector.
25. Enable interlock switch S1 on chassis.
26. Using multimeter. Measure voltage at
pins 14 and 15 of A77A2 card. If
multimeter indicates + 15.0 0.7 V and
+4.0 1.5V, respectively, return A77
unit to depot for repair. If multimeter
does not indicate +15.0 0.7 V and
+4.0 1.5 V respectively replace AT A2
card and continue with step 27.
27 Disable switch S1 on chassis.
28. Remove extender cards.
29. Install A77A2 and A77A4 cards
30. (Conditions of step 10, MODE switch in
TEST, and S1 on A77A4 card enabled,
should exist at this time). Using
oscilloscope measure signal at pin 6 of
A77A4 card. If signal compares with
signal does not compare with
31 Using oscilloscope, measure signal at
pin 29 of A77A4 card. If signal
compares with figure 2-9, continue with
step 35. If signal does not compare
with figure 2-9, continue with step 32.
32. Using oscilloscope, measure signal at
pin 7 of A77A4 card. If signal
compares with figure 2-10, continue
with step 35. If signal does not
compare with figure 2-10, continue with
step 33.
33. Using multimeter, measure voltage at
pin34 of A77A4 card. If multimeter
indicates +0.2 0.2 V, continue with
step 34. If multimeter does not indicate
2-16
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