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 239 of 828
TM 9–2350–311–20–2
3–127
1.
Place one multimeter lead on X2 terminal of
electromagnetic relay K1 and other lead on
terminal 3 of switch S1.
2.
Check for continuity.
Is continuity present?
1.
Turn CAB NBC POWER switch to OFF.
2.
Connect wire 100 to J1 connector of NBC
control box assembly.
3.
Place one multimeter lead on A2 terminal of
electromagnetic relay K1 and other lead to
terminal B of circuit breaker CB1.
4.
Check for continuity.
Is continuity present?
1.
Turn CAB NBC POWER switch to ON.
2.
Place one multimeter lead on terminal 2 and
other lead on terminal 3 of switch S1.
3.
Check for continuity.
Is continuity present?
yes
no
yes
no
Replace switch S1 (para
17–4).
CONTINUED ON NEXT PAGE
Repair wire 6 (para
17–4).
F
G
H
CONTINUED FROM STEP E
TERMINAL 2
SWITCH S1
TERMINAL 3
+
–
TERMINAL 3
WIRE 6
RELAY K1
A2 TERMINAL
+
–
+
–
SWITCH S1
X2 TERMINAL
WIRE 2
J1 CONNECTOR
WIRE 100
RELAY K1
NBC CONTROL
BOX ASSEMBLY
CIRCUIT
BREAKER CB1
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