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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
+0.2 0.2 V with TSW switch pressed,
continue with step 5. If multimeter does
not indicate +0.2 0.2 V with TSW
switch pressed, return unit to depot for
repair.
Using a multimeter, measure for +0.2
5.
0.2 V at TP4 thru TP11, TP13, TP14,
TP16 thru TP21 and TP23 thru TP25
(depending upon which numerical
indicator is incorrect). (See fig. 2-37 to
correlate numerical indication with test
point. If multimeter indication is correct,
return A79 unit to depot for repair. If
multimeter indication is incorrect,
replace A79A2 card (para 3-9c) and
continue with step 6.
6.
Perform step 3 and continue with 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).
5
LAST lamp does not light when
Logic circuit card assembly A79A1.
1.
Install failed unit in hot mock-up.
RESET switch (unit A75) is
2.
Remove unit access cover (para 3-9a).
pressed.
3.
Perform portion of BIT (para 4-2a)
which will duplicate malfunction.
4.
Using multimeter, measure voltage at
TP12 on A79A1 card with RESET
switch pressed. If multimeter indicates
+0.2 0.2 V, return unit to depot for
repair. If multimeter indicates +4.0
1.5 V, continue with step 5.
5.
Measure voltage at TP8 on A79A1 card
with RESET switch pressed. If
multimeter indicates +0.2 0.2 V,
replace A79A1 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).
9.
Purge unit TM 9-2350-230-201.
6
RANGE (METERS) and
Logic circuit card. A79A1: or
1.
Install failed unit in hot mock-up.
RETURNS indicators do not
Readout Circuit Assembly, A79A2.
2.
Remove unit access cover para 3-9a).
blank when RANGE switch
3.
Perform portion of checkout (para 4-2a
unit A75) is pressed.
or 4-2b) which will duplicate
malfunction.
2-33
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