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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
signals at pins 6 and 5 of A78A4 card.
If signals compare with figure 2-15,
replace A78A4 card and continue with
step 25. If signals do not compare with
repair.
18.
Using multimeter, measure voltage at
pin 6 of A78A3 card. If multimeter
indicates the same voltage as for step
10, replace A78A3 card, and continue
with step 25. If multimeter does not
indicate the same voltage as for step
10, continue with step 19.
19.
Remove A78A2 card (para 3-7b).
20.
Install extender card (15, table 2-2).
21.
Insert A78A2 card into extender card
connector.
22.
Perform step 2 and continue with step
23.
23.
Using multimeter, measure voltage at
pin 8 of A78A2 card. If multimeter
indicates the same voltage as for step
10, return A78 unit to depot for repair.
If multimeter does not indicate the
same voltage as for step 10, continue
with step 24.
24.
Using multimeter, measure voltage at
pins 21 and 22 of A78A2 card. If
multimeter indicates the same voltage
as for step 10), replace A78A2 card
and continue with step 25. If
multimeter does not indicate the same
voltage as for step 10, return unit to
depot for repair.
25.
Remove extender cards.
26.
Install cards (para 3-7b).
27.
Remove unit from hot mock-up.
28.
Purge unit (TM 9-2350-230-12).
3
BAT LOW indicator
Storage battery assembly A78B1,
1
Install failed unit in hot mock-up.
illuminates (unit A79).
or battery charge sensor circuit
2.
Charge storage battery assembly
card assembly A78A3.
continue with step 15. If malfunction is
not corrected continue with step 3.
3.
Replace storage battery assembly
(para 3-7 c).
4.
Perform portion of BIT (para 4-2a)
which will duplicate malfunction. If
malfunction is corrected, continue with
step 12. If malfunction is not corrected
continue with step 8.
5.
Remove A78A3 card (para 3-7b).
6.
Install extender card (13. table 2-2).
2-29
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