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 38 of 590
2-4
TM 9-1240-401-34&P
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Section Ill. Troubleshooting
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2-7. GENERAL
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a.
The symptom index can be used as a quick guide to troubleshooting. Common malfunctions are listed in alpha-
betical oder with 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 2-9) lists the common malfunctions which maybe found dur-
ing maintenance of the M146 telescope mount. Perform the tests/inspections and corrective actions in the order
listed.
c.
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 general support maintenance.
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2-8. DIRECT SUPPORT SYMPTOM INDEX
Troubleshooting
Procedure
(Page)
BRACKET ASSEMBLY
Elevation bracket does not slide freely . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..2-5
M146 TELESCOPE MOUNT
Deflection knob is erratic and rough during movement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..2-8
Elevation knob is erratic and rough during movement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..2-5
Tapered pin (king pin) binds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..2-5
Yoke cannot be rotated through 180 degrees without binding . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..2-5
CABLE ASSEMBLY
Cable assembly receptacle does not provide power for the Ml 18A2/M1 18A3 elbow telescope . .
..2-6
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