TM-9-1240-400-34&P Technical Manual for M109 Telescopes and Mounts Download
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TM 9-1240-400-34&P Section III. TROUBLESHOOTING 4-6. TROUBLESHOOTING PROCEDURES. a. The symptom index can be used as a quick guide to troubleshooting. Common malfunctions are listed in alphabetical 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 lists the common malfunctions which may be found during maintenance of the M138 telescope mount. Refer to page 4-4. There are no general support troubleshooting instructions. 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. DIRECT SUPPORT SYMPTOM INDEX Troubleshooting Procedure (Page) MOUNTING SURFACE Mounting surface and locking clamp do not seat M139 telescope correctly .............................................. 4-4 ADAPTER ASSEMBLY M139 telescope does not hold alinement in deflection............................................................................... 4-4 M139 telescope does not hold alinement with lever locked ....................................................................... 4-4 Worm does not move telescope socket 444.45 mils above or below central position with lever unlocked ........................................................................................ 4-5 EXTENSION LIGHT Light does not operate ................................................................................................................................ 4-5 Light intensity does not change when rheostat knob is adjusted ............................................................... 4-5 4-3