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 220 of 828
TM 9–2350–311–20–2
3–108
3–3
TROUBLESHOOTING — CONTINUED
i.
INTERCOMMUNICATION SYSTEM
— CONTINUED
(3)
DRIVER CANNOT COMMUNICATE.
— CONTINUED
1.
Reconnect cable CX9640 at J505 connector of
amplifier AM 1780/VRC.
2.
Disconnect wire 141 from contact arm
assembly quick-disconnect.
3.
Place one multimeter lead in wire 141
quick-disconnect and other lead in socket A of
power system wiring harness connector.
4.
Check for continuity.
Is continuity present?
B
yes
no
Repair or replace wire 142
(para 8–15).
yes
CONTINUED FROM STEP A
no
C
Repair or replace wire 141
(para 8–15).
CONTINUED ON NEXT PAGE
POWER
SYSTEM
WIRING
HARNESS
CONNECTOR
SOCKET A
+
CONTACT ARM
ASSEMBLY
1.
Reconnect wire 141 at contact arm assembly
quick-disconnect.
2.
Disconnect wire 142 from contact arm assembly
quick-disconnect.
3.
Place one multimeter lead in wire 142
quick-disconnect and other lead in socket B of
power system wiring harness connector.
4.
Check for continuity.
Is continuity present?
POWER SYSTEM WIRING
HARNESS CONNECTOR
SOCKET B
WIRE 141
WIRE 142
+
CONTACT ARM
ASSEMBLY
A
B
E
F
G
H
J
K
L
M
N
P
A
B
C
D
E
F
G
K
L
M
N
P
–
–
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