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Page Title:
Table 2-7. Troubleshooting of Battery Power Supply PP-6607/VVG-1 (A78) - Continued |
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 TM 9-1240-369-34
Table 2-7. Troubleshooting of Battery Power Supply PP-6607/VVG-1 (A78) - Continued
Item
No.
Malfunction
Probable cause
Corrective action
3
BAT LOW indicator illuminates
7.
Insert A78A3 card into extender card
(unit A79)-- continued.
connector.
8.
Perform step 4 and continue with step
9.
9.
Using multimeter, measure voltage at
pin 11 of A78A3 card. If multimeter
indicates +0.2 0.2 V, replace A78A3
card and continue with step 10.
10.
Remove extender card.
11.
Install A78A3 card (para 3-7b).
12.
Remove unit from hot mock-up.
13.
Install gasket and unit cover (para
14.
Purge unit (TM 9-2350-230-12).
4
BAT DR indicator illuminates
Battery charge sensor circuit card
1.
Install failed unit in hot m ock-up.
(unit A75) when system
assembly A78A3, or A78 unit.
2.
Perform portion of BIT per (para
operates on vehicular power.
3.
Remove A78A3 card (para 3-7b).
4.
Install extender card (13, table 2-2).
5.
Insert A78A3 card into extender
card connector.
6.
Perform step 2 and continue with step 7
7.
Using a multimeter. Verify voltage at
pin 15 of A78A3 card indicates
+0.9 0.5 V.
8.
Using multimeter ,measure voltage at
pin 15 of A78A3 card. If multimeter
indicates greater than + 24 V, replace
A78A3 card and continue with step 9.
If multimeter indicates +0.2 0.2 V,
return A78 unit to depot for repair.
9.
Remove extender card.
10.
Install A78A3 card para 3-7b).
11.
Remove unit from hot mock-up.
12
Purge unit (TM 9-2350-230-12).
2-30
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