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 232 of 828
TM 9–2350–311–20–2
3–120
3–3
TROUBLESHOOTING — CONTINUED
i.
INTERCOMMUNICATION SYSTEM
— CONTINUED
(5)
TELEPHONE OPERATOR CANNOT COMMU-
NICATE. — CONTINUED
Repair or replace wire L1
from telephone terminal to
contact arm assembly con-
nector (TM 9–2350–311–
20–1).
1.
Clean and adjust electrical contact holder and
brushes (para 9–3).
2.
Place one multimeter lead in wire L1 and other
lead on terminal L1 of telephone connector on
back of vehicle.
3.
Check for continuity.
Is continuity present?
CONTINUED FROM STEP A OR B
1.
Connect wire L2 at contact arm assembly
quick-disconnect.
2.
Disconnect wire L1 at contact arm assembly
quick-disconnect.
3.
Place one multimeter lead in wire L1 and other
lead on terminal L1 of telephone connector on
back of vehicle.
4.
Check for continuity.
Is continuity present?
yes
no
yes
no
C
Go to step E.
yes
no
CONTINUED ON NEXT PAGE
D
+–
WIRE L1
TERMINAL L1
Repair or replace wire L2
from telephone terminal to
contact arm assembly
connector (TM 9–2350–311–
20–1).
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