Quantcast Table 2-6. Troubleshooting of Laser Power Supply Control C-9135/VVG-1 (A77)--Continued - TM-9-1240-369-340033

 

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Page Title: Table 2-6. Troubleshooting of Laser Power Supply Control C-9135/VVG-1 (A77)--Continued
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Table 2-6. Troubleshooting of Laser Power Supply Control C-9135/VVG-1 (A77) - Continued
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TM-9-1240-369-34 Range Finder Fire Control: (Laser) AN/VVG-1 (1240-00-470-2156) Manual
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Table 2-6. Troubleshooting of Laser Power Supply Control C-9135/VVG-1 (A77)--Continued - TM-9-1240-369-340034
TM 9-1240-369-34
Table 2-6. Troubleshooting of Laser Power Supply Control C-9135/VVG-1 (A77)--Continued
Item
No.
Malfunction
Probable cause
Corrective action
2
RANGE (METERS) indicator
with figure 2-7. continue with
(unit A79) does not display
step 12. If signals do not compare
correct readout-continued.
with figure 2-7. continue with step 20.
12.
Disable interlock switch S1 on chassis.
13.
Remove A77A5 card para 3-5c).
14.
Install extender card (3, table 2-1).
15.
Using multimeter, check continuity
between pin 31 of A77A4 card and pin
28 of A77A5 extender card; pin 27 of
A77A4 card and pin 27 of A77A5
extender card: pin 26 of A77A5 card
and pin 26 of A77A5 card; pin 25 of
A77A4 card and pin 25 of A77A5
extender card: pin 24 of A77A4 card
and pin 24 of A77A5 extender card. If
continuity exists. continue with step 16.
If continuity does not exist, return A77
unit to depot for repair.
16.
Remove cable from A77J1 connector.
17.
Using multimeter, check continuity
between pin 13 of A77A5 extender card
and pin H of A77J1connector; pin 12
of A77A5 extender card and pin J of
A77J1 connector; pin 11 of A77A5
extender card and pin K of A77J1
connector; pin 10 of A77A5 extender
card and pin L of A77J1 connector; pin
9 of A77A5 extender card and pin M of
A77J1 connector, pin 8 of A77A5
extender card and pin N of A77J1
connector; pin 7 of A77A5 extender
card and pin P of A77J1 connector; pin
6 of A77A5 extender card and pin R of
A77J1 connector; pin 5 of A77A5
extender card and pin S of A77J1
connector; pin 4 of A77A5 extender
card and pin T of A77J1 connector; pin
3 of A77A5 extender card and pin U of
A77J1 connector: pin 2 of A77A5
extender card and pin V of A77J1
connector; pin 1 of A77A5 extender
card and pin W of A77J1 connector. If
continuity exists, replace A77A5 card
and continue with step 18. If continuity
does not exist, return A77 unit to depot
for repair.
18.
Remove extender cards.
19.
Install A77A4 and A77A5 cards
(para 3-5c), and continue with steps 61
thru 63.
2-15

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