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Page Title:
Table 1. Troubleshooting Procedures |
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 TM 9-1240-375-34&P
0015 00
OPTICAL INSTRUMENT SUPPORT - Continued
Table 1. Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1
1
2
3
M 171
M 171A 1
1 fc 0 3 2
1. OPTICAL INSTRUMENT SUP-
Check mounting surfaces for dirt
WARNING
PORT (1) DOES NOT SEAT
and burrs.
M137/M137A2/M137A3
Use cleaning compound in
TELESCOPE CORRECTLY.
well-ventilated area away
from open flame. Cleaning
compound is harmful to skin
and clothing and may give
off harmful vapor.
1. Clean mounting surface with
cleaning compound (item 12,
2. Remove burrs on mounting
surface with abrasive cloth
(item 9, WP 0152 00) dipped in
cleaning compound (item 12,
2. THUMBSCREWS (2) DO NOT
Check for serviceability of helicoil
SECURE M137/M137A2/
inserts on M137/M137A2/M137A3
M137A3 TELESCOPE
telescope (pantel).
CORRECTLY (M171).
Check for bent or damaged
Replace thumbscrews (WP
thumbscrews or damaged
thumbscrew threads.
passed serviceability check.
0015 00-2
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