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

  TM-9-1240-401-34-P - Page 63 of 590

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TM 9-1240-401-34&P
Section Ill. Troubleshooting
3-7. GENERAL
a.
The symptom index can be used as a quick guide to troubleshooting. Common malfunctions are listed in alpha-
betical order with a page number reference to the troubleshooting table, where a test or inspection and corrective
action are provided.
b. The direct support troubleshooting table (ref. para 3-9) lists the common malfunctions which may be found dur-
ing maintenance oft he M118A2/M118A3 elbow telescope. Perform the test/inspections and corrective actions in
the order listed.
c.
The general support troubleshooting table (ref. para 3-11) lists the common malfunctions which may be found
during maintenance of the M118A2/M118A3 elbow telescope. Perform the tests/inspections and corrective ac-
tions in the order listed.
d. This manual cannot list all malfunctions that may occur, nor all tests or inspections and corrective actions. If a
malfunction is not listed, or is not corrected by listed corrective action, notify the next higher level of maintenance.
3-8. DIRECT SUPPORT SYMPTOM INDEX
Eyepiece arm does not move easily or remain in locked position . . . . . . . . .
Knobs on wormshaft assembly bind.
.... . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lens is fogged or condensation is present . . . . . . . . . . . . . . . . . . . . . . . . . . .
Level has no bubble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mounting surface does not seat Ml 18A2/M1 18A3 elbow telescope correctly
Reticle or level vial are not illuminated. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting
Procedure
(Page)
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3-9. DIRECT SUPPORT TROUBLESHOOTING
MALFUNCTION
TEST OR INSPECTION
LOCATION
CORRECTIVE ACTION
1. MOUNTING SURFACE (1) DOES NOT SEAT
M118A2/M118A3 ELBOW TELESCOPE CORRECTLY.
Observe visually.
a. Clean mounting surface (1) with
cleaning compound (item 3, appx B).
b. Remove burrs with abrasive cloth
(item 4, appx B) dipped in cleaning
compound (item 3, appx B).


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