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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
5
A "4" is displayed on the right
19 Enable switch S1 on A77A4 card.
hand RANGE(METERS)
and interlock switch S2 on chassis.
indicator (unit A79 before
20 Perform step 2 and continue with
RANGE switch(unit A75) is
step 21.
pressed-continued
21. Using oscilloscope, measure signals at
pins 5 and 10 of A77A2 card. If signals
compare with figure 2-14, return A77
unit to depot for repair. If signals do not
compare with figure 2-14, replace
A77A2 card and continue with step 22.
22. Disable switch S1 on A77A4 card, and
interlock switch S1 on chassis.
23. Remove extender cards.
24. Replace A77A1 and A77A2 cards (para
25. Install AT7AI card (para 3-5c)
26 Remove unit from hot mock-up.
27 Purge unit (TM 9-2350-230-12)
6
A "4" is displayed on the right
PFN charge power supply AT77A9,
1. Install failed units into hot mock-
hand RANGE (METERS)
or interface circuit card assembly
up.
indicator (unit A79) after
2. Replace A77A9 module (para 3-5 d).
RANGE switch is pressed.
3. Perform steps 13 thru 19 in "Corrective
action" column for item No.1.
7
With the system operating on
PFN change power supply A77A9,
Perform procedure in "Corrective action"
power provided by batteries
or interface circuit card assembly
column for item No.6.
in A78 unit, a "4" is displayed
A77A7.
on the right hand RANGE
(METERS) indicator after
range switch is pressed
8.
Improper readout on RANGE
Select logic circuit card assembly
1.
Install failed unit into hot mock-
(METERS) indicator when
A77A3 counters circuit card
up.
RANGE RETURN
assembly A77A5, or A77unit.
2. Enable switch S1 on card A77A4,
SELECTOR 1 or 2 (unit A79)
and interlock switch S1 on chassis.
is selected.
3. Perform portion of Checkout (para 4-2a
or 4-2b) which will duplicate
malfunction.
4. Disable switch S1 on card A77A4, and
interlock switch S1 on chassis.
5. Remove ATT A3 card (para 3-5c).
6. Install extender card (5, table 2-1)
7. Insert AT A3 card into extender
card connector.
8. Enable switch S1 on card A77A4
and interlock switch S1 on chassis.
9. Perform step 3 and continue with step
10.
10. Using multimeter, measure voltage at
pin 20, 21, or 22, of A77A3 card. If
2-22
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