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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 of Laser Power Supply Control C-9135/VVG-1 (A77)-Continued
Item
No.
Malfunction
Probable cause
Corrective action
2
RANGE (METERS)indicator
+0.2:0.2 V, return A77 unit to depot
unit A79 does not display
for repair
correct readout-continued
34.
Using multimeter, measure
voltage at pins 14 and 15 of A77A4
card. If multimeter indicates 15.0 1.0
V and + 4.0 1.5 respectively, replace
A77A4 card and perform steps 27 thru
29, and 61 thru 63.If multimeter does
not indicate +15.0 1.0 V and 4.0 1.5
V, respectively, perform steps 21 thru
26.
35.
Using oscilloscope, measure signal at
pin 27 of A77A4 card. If signal
compares with figure 2-11,continue
with step 36. If signal does not
compare with figure 2-11, continue
with step 13.
36.
Using oscilloscope, measure signal at
pin 12 of A77A4 card. If signal
compares with figure 2-12, continue
with step 50. If signal does not
compare with figure 2-12. continue
with step 37.
37.
Perform step 32. If signal compares
with figure 2-10, Continue with step 38.
If signal does not compare with
38.
Using multimeter, measure voltage at
pin 10 of A77A4 card. If multimeter
indicates +4.0 1.5 .V replace A77A4
card and perform steps 27 and 28. If
multimeter does not indicate +4.0 1..5
V, continue with step 39.
39.
Using multimeter, measure voltage
at pin 9 of A77A4 card. If multimeter
indicates +5.0 0.5V, replace A.77A4
card and perform steps 27 and 28. If
multimeter does not indicate
+5.0 0.5V. continue with step 40.
40.
Disable interlock switch S1 on chassis.
41.
Remove A77A7 card para 3-7c).
42.
Install extender card (11, table 2-2).
43.
Insert A7TAT card into extender card
connector.
44.
Enable interlock switch S1 on chassis.
45
Using multimeter. Measure voltage at
pin 10 of A77A7 card. If multimeter
indicates+5.0 0.5V. return A77 unit to
depot for repair. If multimeter does
not indicate +4.0 1.5 V, continue with
step 46.
2-17
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