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 216 of 828
TM 9–2350–311–20–2
3–104
3–3
TROUBLESHOOTING — CONTINUED
i.
INTERCOMMUNICATION SYSTEM
— CONTINUED
(1)
INTERCOMMUNICATION SYSTEM WILL NOT
OPERATE. — CONTINUED
Repair or replace wire 148
from harness connector to
power relay box assembly
(para 8–14).
yes
no
C
CONTINUED FROM STEP B
yes
no
Repair ground lead (para
8–14).
CONTINUED ON NEXT PAGE
D
–
+
–+
POWER RELAY BOX TO INTERCOM POWER
SUPPLY HARNESS CONNECTOR SOCKET A
1.
Turn MASTER switch to OFF.
2.
Reconnect wire 148 at power relay box assembly.
3.
Disconnect power relay box to intercom power
supply harness connector from cable CX4720.
4.
Turn MASTER switch to ON.
5.
Place red multimeter lead in socket A of harness
connector and black lead to ground.
6.
Check for voltage.
Is battery voltage present?
1.
Turn MASTER switch to OFF.
2.
Place one multimeter lead in socket B of power
relay box to intercom power supply harness
connector and other lead to ground.
3.
Check for continuity.
Is continuity present?
POWER RELAY BOX TO INTERCOM
POWER SUPPLY HARNESS CONNECTOR
SOCKET B
Back to Top
