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Page Title:
Table 2-8. Troubleshooting of Laser Ranging Commander's Control C-9134/VVG-1 (A79) cont'd |
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 TM 9-1240-369-34
Table 2-8. Troubleshooting of Laser Ranging Commander's Control
C-9134/VVG-1 (A79)-Continued
Item
No.
Malfunction
Probable cause
Corrective action
1
When TSW switch is pressed
with TSW pressed. If multimeter
indicates +0.80.8 V. continue with
one or more do not illuminate-
continued.
step 7. If multimeter does not
indicate +0.8 0.8 V return unit to
depot for repair.
7. Using multimeter, measure TP8 thru
TP10 ,TP15 thru TP19. And voltage at
TP28. If multimeter does not indicate
1.5 0.5 V. At TP8 thru TP10. And
and +0.8 0.8 V at the other test
points, replace A79A1card (para 3-9b)
and continue with step 8.
8. Perform step 2 and continue with step
9.
9. Remove unit from hot mock-up.
10. Replace unit access cover (para 3-9a)
11. Purge unit (TM 9-2350-230-12)
2
When DMR switch is pressed,
A79 unit
Return unit to depot for repair.
The indicators do not dim or
brighten
3
MALF lamp does not illuminate
Defective lamp or logic circuit card
1.
Install failed unit in hot mock-up.
when a system malfunction
A79A1.
2.
Perform portion of checkout (para 4-2a
is detected.
or 4-2b) which will duplicate
malfunction.
3.
Remove unit access cover (para 3-9 a).
4.
Using a multimeter, measure voltage at
TP19 on A79A1 card with RANGE
switch pressed. If multimeter indicates
+0.2 0.2 V, return unit to depot for
repair. If multimeter indicates +15.0
0.7 V, proceed to step 5.
5.
Using multimeter, measure voltages at
TP24, TP25, TP26, and TP32 on
AQ9A1 card. If multimeter indicates
+0.2 0.2 v at any test point, replace
A79A1 card (para 3-9b) and continue to
step 6. If multimeter does not indicate
+0.22 0.2 V at any test point, return
unit to depot for repair.
6.
Perform step 2 and continue to step 7.
7.
Remove unit from hot mock-up.
8.
Replace unit access cover (para 3-9a).
9.
Purge unit (TM 9-2350-230-12).
4
Incorrect indication on RANGE
Readout circuit card assembly
1.
Install failed unit in hot mock-up.
(METERS) or RETURNS in-
A79A2.
2.
Remove unit access cover (para 3-9a).
dicators.
3.
Perform portion of checkout (para 4-2a
or 4-2b) which will duplicate
malfunction.
4.
Using a multimeter, measure voltage at
TP22 on A-79A2 card. If multimeter
indicates
2-32
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