TM-9-1240-401-34-P
TELESCOPE MOUNT M146: M118A2 AND M118A3; TELESCOPE MOUNT M145: M145A1; PANORAMIC TELESCOPE: M117 AND M117A2; FIRE CONTROL QUADRANT: M15; PERISCOPE: M42
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL
JULY 1993
TM-9-1240-401-34-P - Page 64 of 590
3-6
TM 9-1240-401-34&P
3-9.
DIRECT SUPPORT TROUBLESHOOTING - continued
MALFUNCTION
TEST OR INSPECTION
LOCATION
CORRECTIVE ACTION
2.
3.
4.
5.
6,
EYEPIECE ARM (2) DOES NOT MOVE EASILY OR
REMAIN IN LOCKED POSITION.
Move eyepiece arm (2) from stop to stop.
a. Repair lock-release lever (ref. para 3-13).
b. Replace bellows assembly (ref. para
3-13).
KNOBS (3) ON WORMSHAFT ASSEMBLY BIND.
Rotate knobs (3) on wormshaft assembly.
Repair wormshaft assembly (ref. para 3-15).
RETICLE (4) OR LEVEL VIAL (5) ARE NOT lLLUMl-
NATED.
Turn variable resistor knob (6).
a.
b.
c.
Replace incandescent lamp for Ml 18A2
(ref. para 3-17) for cover assembly and
para 3-19 for level).
Replace circuit board assembly for
M118A3 (ref. para 3-18 for level).
Replace variable resistor (ref. para 3-13).
LEVEL (5) HAS NO BUBBLE.
Observe visually.
Repair level assembly, M118A2 (ref.
para 3-19).
Repair level assembly, M118A3 (ref.
para 3-18).
LENS (7) IS FOGGED OR CONDENSATION IS
PRESENT.
Observe visually.
Purge and charge M118A2/M118A3 elbow
telescope (TM 750-116).
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