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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
6
(RANGE (METERS) and
4.
Using multimeter, measure voltage at
RETURNS indicators do not
TP22 on A79AI card with RANGE
blank when RANGE switch
switch pressed. If signal momentarily
(unit A75 is pressed-continued.
goes high, continue with step 5. If
signal does not momentarily go high,
continue with step 6.
5. Use multimeter to measure voltage at
TP15 of A79A2 card with RANGE
switch pressed. If signal momentarily
goes high, replace AT9A2 card
multimeter indication does not
momentarily go high, return unit to
depot for repair.
6. Using multimeter, measure voltage at
TP23 of A79A1 card with RANGE
switch pressed. If multimeter indicates
+0.2 0.2 V. replace AT9A1 card
If multimeter indicates +5.0 0.1 V
return unit to depot for repair.
7. Perform step 3 and continue with step
8.
8. Remove unit from hot mock-up.
9. Replace unit access cover (para 3-9a).
10. Purge unit (TM 9-2350-230-12).
7
RANGE RETURN SELECTOR 1
Logic Circuit card assembly A79A1.
1. Install failed unit in hot mock-up
or 2 lamp does not illuminate.
2. Remove unit access cover (para 3-9a).
3. Perform portion of checkout (para 4-2a
or 4-2b) which will duplicate
malfunction.
4. Using multimeter, measure voltage at
TP6 on A79A1 card after 1 switch has
been pressed, or at TP4 on A79A1 card
after 2 switch has been pressed. If
multimeter indicates +0.9 0.5 V,
return unit to depot for repair. If
multimeter indicates +15.0 0.7 V,
continue with step 5.
5. Using multimeter, measure voltage at
TP8 on A79A1 card with 1 switch
pressed, or at TP9 on A79A1 card with
2 switch pressed. If multimeter
indicates +0.2 0.2 V, replace AT9A1
card (para 3-9b) and continue with step
6. If multimeter does not indicate +0.2
0.2 V, return unit to depot for repair.
6. Perform step 3 and continue with step
7.
7. Remove unit from hot mock-up.
8. Replace unit access cover (para 3-9a).
2-34
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