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 197 of 828
TM 9–2350–311–20–2
Change 2
3–85
1.
Turn CAB POWER switch to ON.
2.
Place red multimeter lead on output terminal 2 of
CAB POWER switch and black lead to ground.
3.
Check for voltage.
Is battery voltage present?
Replace wire from CAB
POWER switch to circuit
breaker (para 8–12).
1.
Place red multimeter lead on input terminal 3 of
CAB POWER switch and black lead to ground.
2.
Check for voltage.
Is battery voltage present?
I
yes
no
CONTINUED FROM STEP H
yes
no
J
Replace CAB POWER
switch (para 8–12).
END OF TASK
–
+
INPUT TERMINAL
–
+
OUTPUT TERMINAL
CAB POWER
SWITCH
CAB
POWER
SWITCH
K
yes
no
Troubleshoot elevation
and traversing system.
Replace wire from CAB
POWER switch to ELEVA-
TION CONTROL switch
(para 8–12).
–+
ELEVATION
CONTROL
SWITCH
TERMINAL
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