ARMY TM 9-1290-262-24&P
MARINE CORPS TM 00476C-24&P
AIR FORCE TO 49A7-3-72/74
Table 3-1. DIRECT SUPPORT TROUBLESHOOTING (cont)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
M2A2 AIMING CIRCLE (CONT)
7. ELEVATION KNOB HAS LIMITED MOVEMENT.
Step 1. Turn elevation knob to elevate or depress elbow telescope.
Step 2. Check that elbow telescope moves 1130 mils in elevation and 430 mils in
depression.
Step 3. Check for missing or improperly positioned key washers.
Replace or reposition key washers. Refer to page 3-12.
Step 4. Recheck elevation worm shaft for limited movement.
Replace worm shaft. Refer to page 3-12.
8. ELEVATION MICROMETER SCALE SLIPS.
Step 1. Check that screws are tight.
If screws are tight, loosen screws and adjust micrometer scale dial.
Refer to page 3-12.
Step 2. Check for stripped threads on screws and in adapter.
a. Replace screws or adapter. Refer to page 3-12.
b. Adjust micrometer scale dial. Refer to page 3-12.
9. AZIMUTH MICROMETER SCALE SLIPS.
Step 1. Check that screws are tight.
a. If screws are tight, loosen screws and micrometer scale dial.
Refer to page 3-12.
b. Adjust scales and tighten screws. Refer to page 3-12.
