TM-9-2350-311-20-2
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5
TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR CAB, ARMAMENT, SIGHTING AND FIRE CONTROL, ELEVATING AND TRAVERSING SYSTEMS AND ASSOCIATED COMPONENTS
DECEMBER 1993
TM-9-2350-311-20-2 - Page 230 of 828
TM 9–2350–311–20–2
3–118
3–3
TROUBLESHOOTING — CONTINUED
i.
INTERCOMMUNICATION SYSTEM
— CONTINUED
(4)
OPERATOR CANNOT COMMUNICATE AT
GUNNER’S OR COMMANDER’S CONTROL
BOX. — CONTINUED
1.
Disconnect cable CX4723 at amplifier
AM1780/VRC.
2.
Place one multimeter lead in position 1 and other
lead in position 2 for individual continuity checks.
POSITION 1
POSITION 2
LL
KK
HH
3.
Check for continuity.
Is continuity present?
yes
no
F
CONTINUED FROM STEP E
END OF TASK
1.
Reconnect cable CX4723 at amplifier
AM1780/VRC.
2.
Place one multimeter lead on cable CX4723 pin
A and other lead to ground.
3.
Check for continuity.
Is continuity present?
Replace cable CX4723
(para 8–16).
Replace control box (para
8–16). If malfunction per-
sists, replace amplifier
AM1780/VRC (para 8–16).
Replace cable CX4723
(para 8–16).
yes
no
G
Replace control box (para
8–16).
yes
no
POSITION 2
CABLE CX4723
CONNECTORS
POSITION 1
POSITION 1
POSITION 1
POSITION 2
POSITION 2
+
–
CABLE CX4723
CONNECTORS
CABLE CX4723
CONNECTORS
CABLE CX4723
CONNECTOR PIN A
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