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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
4.
Disable switch S1 on A77A4 card,
hand RANGE(METERS)
and interlock switch S1 on chassis.
indicator unit A79 before
RANGE switch (unit A75) is
5.
Remove A77A1card (para 3-5c).
pressed-continued.
6.
Install extender card (6, table 2-1)
7.
Insert A7 AI card into extender card.
8.
Enable switch S1 on A77A4 card and
interlock switch S1 on chassis.
9.
Perform step 3 and continue with
step10.
WARNING
The following step requires
measurement of dangerous
potential(-1900 200 V). Exercise
extreme caution when taking this
measurement.
10. Using multimeter, measure voltage at
pin 29 of A77A1 card. If multimeter
indicates -1900 20 V, continue with
step 11. If multimeter does not
indicate -1900 200 V, continue with
step 12.
11 Using multimeter, measure voltage at
pin 8 of A77A9 card. If multimeter
indicates +4.0 1.5 V. Continue with
item 6 "Corrective action". If
multimeter indicates +0.2 0.2 V.
continue with step 12.
12. Using oscilloscope, measure signals
at pins 5 and 14 of A77A1 card. If
signals compare with figure 2-14.
continue with step 13. If signals do
not compare continue with step 16.
13. Using multimeter, measure voltage at
pin 7A of A77A1 card. If multimeter
indicates +15.0 1.0 V replace A77A1
card and continue with step 14. If
signals do not compare with figure
14. Disable switch S1 on A77A4 card.
and interlock switch S1 on chassis.
15 Remove extender card and continue
with step 25.
16. Remove A77A2 card para 3-5c).
17. Install extender card (12, table 2-2).
18. Insert ATTA2 card into extender card
connector.
2-21
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