ARMY TM 9-1290-262-24&P
MARINE CORPS TM 00476C-24&P
AIR FORCE TO 49A7-3-72/74
4-1. TROUBLESHOOTING INFORMATION (cont).
SYMPTOM INDEX
Troubleshooting
Procedure
(Page)
M2A2 AIMING CIRCLE
Compass needle fails to turn freely when unlocked . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Image is poorly defined . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...4-3
Image is tilted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Parallax in optical system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Reticle does not become illuminated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Reticle is tilted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Telescope reticle has poor definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Table 4-1. GENERAL SUPPORT TROUBLESHOOTING
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
M2A2 AlMING CIRCLE
1. RETICLE DOES NOT BECOME ILLUMINATED.
Step 1. Attach a serviceable M51 instrument light to the elbow telescope. Turn switch
on.
Step 2. Check for dirt on optical instrument window.
Remove optical instrument window. Refer to page 4-5. Clean
thoroughly using optical lens cleaning compound (item 4, appx D)
and lens paper (item 7, appx D).
Step 3. Check position of reticle assembly.
Adjust position of reticle assembly. Refer to page 4-16.
Step 4. Inspect reticle assembly for defects.
Replace defective reticle assembly. Refer to page 4-5.
