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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 (A 77)-Continued
Item
No.
Malfunction
Probable cause
Corrective action
2
RANGE (METERS)indicator
46. Using multimeter measure voltage
unit A79 does not display
at pin 11 and 12 of A77A7card. If
multimeter indicates + 0.2 0.2V and
correct readout--continued.
+4.0 1.5 V. respectively. replace
A77A7 card and continue with step
47 If multimeter does not indicate
+0.2 0.2 V and + 4.0 1.5 V re-
spectively. return A77 unit to depot
for repair.
47. Perform steps 27 and 28, and
continue with step 48.
48. Install A77A4 and A77A7 cards (para
49. Enable interlock switch S1 o n chassis.
50. Perform step 33. If multimeter
indicates +0.2 0.2 V, continue with
step 51. If multimeter does not
indicate +0.2 0.2 V. Return A77 unit
to depot for repair.
51. Perform step 38. If multimeter
indicates +4.0 1.5 V, continue with
step 52. If multimeter does not
indicate +4.0 1.5V,perform steps 41
thru 46.
52. Using multimeter, measure voltage at
pin 9 of A77A4 card. If multimeter
indicates +4.0 1.5 V. continue with
step 57. If multimeter does not
indicate + 4.0 1.5 V. continue with
step 53.
53. Perform steps 41 thru 44.
54. Using multimeter. Measure voltage
at pin 10 of A77A7 card. If multimeter
indicates + 4.0 1.5 V. return A77 unit
to depot for repair. If multimeter does
not indicate +4.0 1.5 V. continue with
step 55.
55. Using multimeter measure voltage at
pins 11 and 12 of A77A7 card. If
multimeter indicates + 0.2 0.2 V and
+4.0 1.5 V, respectively. replace
A77A7 card and continue with step 56.
If multimeter does not indicate
+0.2 0.2 V and +4.0 1.5 V,
respectively. return A77 unit to depot
for repair.
56. Perform steps 27, 28,48 and 49.
57 Using oscilloscope. Measure signal at
pin 7 of A77A4 card. If signal
compares with figure 2-10, continue
with step 60. If signal does not
compare with figure 2-10 continue with
step 58.
2-18
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