TM-9-1200-215-34&P Technical Manual for M109 Automatic Fire Control System (AFCS) Download
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TM 9–1200–215–34&P 1–15 Section III – GENERAL TROUBLESHOOTING AND MAINTENANCE Page Page General 1–15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Initial Fault Indication 1–15 . . . . . . . . . . . . . . . . . . . . . Fault Isolate LRU 1–16 . . . . . . . . . . . . . . . . . . . . . . . . . Purge LRU 1–18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Inlet Valve Maintenance Instructions 1–22 . . . . . . . . J5 Protective Cover Maintenance Instructions 1–23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–20. GENERAL This section provides general troubleshooting procedures which will fault isolate the defective component(s) of the Line Replaceable Unit (LRU) down to the defective Shop Replaceable Unit (SRU) and maintenance procedures that are common to multiple LRUs. 1–21. INITIAL FAULT INDICATION a. An LRU failure is indicated when one of the following occurs: (1) The green indicator light (POWER) did not come on when power was applied to the LRU. or (2) The red indicator light (BIT) came on when input power was applied to the LRU or during unit operation, when BIT runs continuously. b. When an LRU failure has been detected, proceed to further troubleshoot the LRU by using Electronic Shop Transportable AN/TSM–191(V)3. Results from this fault isolation will indicate SRU component(s) requiring replacement. The LRU fault isolation procedure is presented in paragraph 1–22.