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 205 of 828

TM 9–2350–311–20–2
Change 2
3–93
h.
CAB LIGHTING SYSTEM
— CONTINUED
(3)
M145/M145A1 TELESCOPE MOUNT AND
M117/M117A2 PANORAMIC TELESCOPE
LIGHTS ARE OUT, BUT ALL OTHER LIGHTS
OPERATE.
INITIAL SETUP
Test Equipment
Multimeter (item 6, Appx H)
Tools
Artillery and turret mechanic’s tool kit
(SC 5180–95–CL–A12)
Equipment Condition
Vehicle MASTER switch to OFF (TM 9–2350–311–10)
Repair ground lead (para
8–3).
1.
Check ground lead for good connection.
2.
Place red multimeter lead in one socket and
black lead in ground socket of wire 147B.
3.
Check for voltage.
Is battery voltage present?
Replace wire 147B (para
8–3).
yes
no
A
yes
no
CONTINUED ON NEXT PAGE
B
WIRE 147B
M145/M145A1
TELESCOPE
MOUNT
1.
Disconnect wire 147B at M145/M145A1
telescope mount.
2.
Turn MASTER switch to ON.
3.
Place red multimeter lead in each socket of wire
147B and black lead to ground.
4.
Check for voltage.
Is battery voltage present at one socket only?
WIRE 147B
+
+


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