TM-9-2350-274-BD M109 Battlefield Damage Assessment and Repair Download
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TM 9-2350-274-BD COMMUNICATIONS SYSTEM Detailed Assessment Steps (Cont): 3. 4. Disconnect CX-4723 cable leading to the non-operational control box at the AM- 1780, and switch it with another CX-4723 cable at the AM- 1780 receptacles. a. If the same problem occurs in the control box now connected to that receptacle, repair or replace the AM-1780. b. If the problem stays with the same control box, go to step 4. Switch the CX-4723 cables back to their original positions on the AM-1780, and replace the non-operational control box with a-known operational control box. a. If the problem no longer exists, replace or repair the control box. b. If the problem still exists, replace or repair the CX-4723 cable between the control box and the AM-1780. (Refer to para. 11-12 or 11-13.) 5. If the cable and/or the control box cannot be repaired or replaced, install the field expedient intercom described in para. 11-10 or 11-11. 11-7