TM 9–2350–311–20–2
3–116
i.
INTERCOMMUNICATION SYSTEM
— CONTINUED
(4)
OPERATOR CANNOT COMMUNICATE AT GUN-
NER’S OR COMMANDER’S CONTROL BOX.
INITIAL SETUP
Test Equipment
Multimeter (item 6, Appx H)
Tools
Artillery and turret mechanic’s tool kit
(SC 5180–95–CL–A12)
Equipment Condition
Amplifier AM 1780/VRC POWER switch to OFF
(TM 9–2350–311–10)
Vehicle MASTER switch to OFF (TM 9–2350–311–10)
1.
Disconnect operator’s mic/headset from control
box.
2.
Connect mic/headset to a control box that is
operating correctly.
3.
Turn MASTER and amplifier AM 1780/VRC
POWER switches to ON.
4.
Operate mic/headset.
Does mic/headset operate properly?
yes
no
A
Replace mic/headset.
1.
Turn MASTER and amplifier AM1780/VRC
POWER switches to OFF.
2.
Place control box MONITOR switch to ALL and
VOLUME to maximum.
3.
Disconnect cable CX4723 from J801 or J804
connector.
4.
Place one multimeter lead in socket L of J801 or
J804 connector and other lead to pin B of J802
connector.
5.
Check for continuity.
Is continuity present?
NOTE
The following checks must be made on
connectors J801 and J804.
B
CONTINUED ON NEXT PAGE
+
–
J801 OR J804
CONNECTOR
SOCKET L
J802
CONNECTOR
PIN B