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 163 of 828

TM 9–2350–311–20–2
3–52
3–3
TROUBLESHOOTING CHART — CONTINUED
d.
ELEVATING SYSTEM — CONTINUED
(2)
CANNON MOVES BY ONLY ONE CONTROL
HANDLE, BUT MANUAL OPERATION IS NOR-
MAL. –
CONTINUED
1.
Turn MASTER and CAB POWER switches to
OFF.
2.
Disconnect harness at J2 connector of gunner’s
selector switch box assembly.
3.
Place one multimeter lead at socket A of J2
connector harness and other lead to wire 623.
4.
Check for continuity.
Is continuity present?
yes
no
F
Repair wire 623 (para
8–8).
CONTINUED FROM STEP E
CONTINUED ON NEXT PAGE
+
J2 CONNECTOR
HARNESS
SOCKET A
WIRE 623
CONNECTOR
Repair wire 623 from J2
connector to ELEVATION
CONTROL switch (para
8–12).
G
yes
no
1.
Reconnect wire 623 to quick-disconnect at
gunner’s selector switch box assembly.
2.
Open gunner’s selector switch box assembly.
3.
Place one multimeter lead on terminal 1 of
ELEVATION CONTROL switch and other lead to
pin A of J2 connector.
4.
Check for continuity.
Is continuity present?
+–
PIN A
GUNNER’S
SELECTOR
SWITCH BOX
ASSEMBLY
ELEVATION
CONTROL
SWITCH
TERMINAL
J2 CONNECTOR


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