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Page Title:
Table 2-9. Troubleshooting of Laser Receiver-Transmitter RT-1021/VVG-1 (A76) cont'd |
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 TM 9-1240-369-34
Table 2-9. Troubleshooting of Laser Receiver-Transmitter
Rt-1021/VVG-1(A76) - Continued
Item
No.
Malfunction
Probable cause
Corrective action
2
Reticle lamps do not illuminate.
Defective lamp: "A"-trigger circuit
1.
Install failed unit into hot mock-up.
card assembly. A76A2: or A76
2.
Replace reticle lamps (para 3-12p). If
unit.
malfunction is corrected, continue with
step 4. If malfunction is not corrected,
continue with step 3.
3.
Replace A76A2 card (para 3-12f). If
malfunction is corrected, continue with
step 4. If malfunction is not corrected
return A76 unit to depot for repair.
4.
Perform receiver-transmitter unit
alinement (para 3-12c).
3
Improper display on RANGE
Video amplifier assembly. A76A7.
1.
Install failed unit into hot mock-up.
(METERS) indicators (unit
malfunction 3/buffer logic circuit
2.
Perform portion of checkout (para 4-2a
A79).
card, A76A1, or A76 unit.
or 4-2b) which will duplicate
malfunction.
3.
Replace A, 6A7 assembly (para 3-12m)
and perform step 2. If malfunction is
corrected, continue with step 5. If
malfunction is not corrected, replace
A76A1 card per (para 3-12e), install
original A76A7 assembly and perform
step 4.
4.
Perform step 2. If malfunction is not
corrected, return A76 unit to depot for
repair. If malfunction is corrected.
continue with step 5.
5.
Perform receiver-transmitter unit
alinement (para 3-12c).
4
Q-switch motor-operates when
Transmitter logic circuit card
1.
Install failed unit into hot mock-up.
power is applied to system.
assembly A76A4, transmitter
2.
Perform portion of BIT (para 4-2a)
component assembly A76A3, or
which will duplicate malfunction.
A76 unit.
3.
Using multimeter, measure voltage
at pin 4c of terminal board WITB1.
If voltage is +4 1.5 V, continue with
step 4. If voltage is +0.2 0.2 V, return
A76 unit to depot for repair.
4.
Replace A76A4 card (para 3-12j).
5.
Perform step 2. If malfunction is
corrected continue with step 8. If
malfunction is not corrected
continue with step 6.
6.
Replace A76A3 assy (para 3-12g) and
install original A76A4 card.
7.
Perform step 2. If malfunction is not
corrected, return A76 unit to depot for
repair. If malfunction is corrected
perform step 8.
8.
Perform receiver-transmitter unit
alinement (para 3-12c).
2-36
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