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 224 of 828
TM 9–2350–311–20–2
3–112
3–3
TROUBLESHOOTING — CONTINUED
i.
INTERCOMMUNICATION SYSTEM
— CONTINUED
(3)
DRIVER CANNOT COMMUNICATE.
— CONTINUED
Replace cable CX9640
(TM 9–2350–311–20–1).
K
yes
no
CONTINUED ON NEXT PAGE
CONTINUED FROM STEP J
1.
Reconnect wires 141, 142, and 143 at contact
arm assembly quick-disconnects.
2.
Disconnect cable CX9640 at driver’s control box.
3.
Place one multimeter lead in position 1 and other
lead in position 2 for individual continuity checks.
POSITION 1
POSITION 2
AH
CK
BL
4.
Check for continuity.
Is continuity present?
L
yes
no
1.
Reconnect cable CX9640 connector to
telephone/intercom wiring harness connector.
2.
Place one multimeter lead in pin A of cable
CX9640 and other lead to ground.
3.
Check for continuity.
Is continuity present?
Replace cable CX9640.
–
+
POSITION 2
–
+
–
+
CABLE CX9640
CONNECTORS
POSITION 1
POSITION 1
POSITION 1
POSITION 2
POSITION 2
CABLE CX9640
PIN A
–
+
CABLE CX9640
CONNECTORS
CABLE CX9640
CONNECTORS
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