TM 9–2350–311–20–2
3–106
3–3
TROUBLESHOOTING — CONTINUED
i.
INTERCOMMUNICATION SYSTEM
— CONTINUED
(2)
AMPLIFIER AM1780/VRC DOES NOT KEY
WHEN MIC BUTTON IS PUSHED.
INITIAL SETUP
Tools
Artillery and turret mechanic’s tool kit
(SC 5180–95–CL–A12)
Equipment Condition
Vehicle MASTER switch to OFF (TM 9–2350–311–10)
Amplifier AM 1780/VRC POWER switch to OFF
(TM 9–2350–311–10)
1.
Disconnect cable CX4723 from J506 connector
at amplifier AM 1780/VRC.
2.
Turn MASTER and amplifier AM 1780/VRC
POWER switches to ON.
3.
Place a jumper wire in socket H and socket A
of J506 connector.
4.
Repeat steps 1. through 3. for connectors
J507, J505, J510, and J504.
Is a clicking noise heard in amplifier AM 1780/VRC for
each test?
yes
no
A
Replace amplifier AM
1780/VRC (para 8–16).
Troubleshoot faulty control
box circuit (para 3–3i.).
END OF TASK
J507
J506
J505
J504
J510
AMPLIFIER
AM 1780/VRC
J506, J507, J505, J510,
OR J504 CONNECTOR