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 65 of 590
TM 9-1240-401-34&P
3-10. GENERAL SUPPORT SYMPTOM INDEX
Troubleshooting
Procedure
(Page)
Eyepiece arm will not remain in stowed position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Lens is damaged . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Lens will not focus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Reticle is not illuminated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..3-7
3-11. GENERAL SUPPORT TROUBLESHOOTING
MALFUNCTION
TEST OR INSPECTION
LOCATION
CORRECTIVE ACTION
1. LENS(1) WILL NOT FOCUS.
Observe visually.
Repair eyepiece and erector lens
subassembly (ref. para 3-22).
2. LENS (1) IS DAMAGED.
Observe visually.
Repair eyepiece and erector lens
subassembly (ref. para 3-22).
3. RETICLE (2) IS NOT ILLUMINATED.
Observe visually.
a. Replace circuit board assembly for
M118A3 (ref. para 3-24).
b. Repair wiring harness (ref. para
3-26).
4. EYEPIECE ARM (3) WILL NOT REMAIN IN
STOWED POSITION.
Operate lock-release lever.
Repair ratchet (4) (ref. para 3-22).
3-7
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