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 3-6. 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. There are no direct support troubleshooting instructions. The general support troubleshooting table lists the common malfunctions which may be found during maintenance of the M139 elbow telescope. Refer to page 3-4. 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. GENERAL SUPPORT SYMPTOM INDEX Troubleshooting Procedure (Page) M139 ELBOW TELESCOPE Is not collimated .................................................................................................................................................. 3-4 Has moisture or foreign matter ........................................................................................................................... 3-4 EYEPIECE ASSEMBLY Has moisture, foreign matter, or is chipped ........................................................................................................ 3-4 RETICLE CELL ASSEMBLY Has moisture or foreign matter ........................................................................................................................... 3-5 Does not illuminate ............................................................................................................................................. 3-5 COVER ASSEMBLY Is not secured properly Plate is not legible ............................................................................................................................................... 3-6 OBJECTIVE CELL ASSEMBLY Has moisture or foreign matter ........................................................................................................................... 3-6 Parallax exceeds 0.1 mil at 125 meters .............................................................................................................. 3-6 3-3