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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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 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
4
A ''2" is displayed on the right.
9.
Perform step 3 and continue with
hand 'RANGE (METERS)
step 10.
indicator unit (A79)--
10.
Using multimeter, measure voltage at
continued.
pin 5A of A77A4 card. If multimeter
indicates + 0.20.2 V. continue with
step 16. If multimeter indicates +5.0
0.5 V. Continue with step 11.
11.
Using multimeter measure voltage at
pin 5 on A7T7A7 card. If multimeter
indicates +4.0 1.5 V. continue with
step 12. If multimeter indicates
+0.2 0.2 V return A77 unit to depot.
12.
Using multimeter measure voltage at
pin 31 on A77A7 card. If voltmeter
indicates +4.0 1.5 V. Replace AT7A7
card and continue with step .21. If
multimeter indicates +0.2 0.2 V,
continue with step13.
13.
Disable switch S1 on A77A4 card. And
interlock switch S2 on chassis.
14.
Remove A77A5 card (para 3-5c).
15.
Install extender card (3, table 2-1)
connector.
16.
Insert A77A5 card into extender card
connector.
17.
Enable switch S1 on A77A4 card, and
interlock switch S2 on chassis.
18.
Perform step 3 and continue with step
19.
19.
Using multimeter, measure voltage at
pin A77A5 card. If multimeter indicates
+3.5 1.5 V, return A77 unit to depot
for repair. If multimeter indicates
+0.2 0.2 V, continue with step 20.
20.
Perform steps 11 thru 63 in "Corrective
action" column for item No. 2.
21.
Disable switch S1 on A77A4 card and
switch S2 on chassis.
22.
Remove extender cards.
23.
Install A77A4 and A77A7 cards
(para 3-5 c).
24.
Remove unit from hot mock-up.
25.
Purge unit (TM 9-2350-230-12).
5
A "4" is displayed on the right
-1600 V power supply circuit card
1.
Install failed units into hot mock-
hand RANGE(METERS)
assemblyA77A1, low voltage
up.
indicator (unit A79) before
power supply A77A2, or A77 unit.
2.
Enable switch S1 on A77A4 card,
RANGE switch(unit A75) is
and interlock switch S1 on chassis.
pressed.
3.
Perform portion of Checkout (para 4-2a
or 4-2b) which will duplicate
malfunction.
2-20
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