TM-9-2350-275-BD Battlefield Damage Assessment and Repair for M113 Family Download
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TM 9-2350-275-BD COMMUNICATIONS SYSTEM 11-6. OBSERVABLE SYMPTOM: THE INTERCOM DOES NOT WORK ON ANY CONTROL BOX Detailed Assessment Steps 1. Make sure the DC power is available to the turret by checking the dome light or other electrical equipment in the turret. 2. Make sure the MK-2096 Transient Voltage Suppressor is operational by checking for a red light on the suppressor. If the light is lit, replace or remove the suppressor. 3. Make sure that the MX-7777 or MX-7778 Transient Voltage Suppressor is operational by depressing the Battle-Override switch. If the suppressor is bad, replace or repair as necessary. 4. Check that communication equipment is turned on and the switches are in the proper positions. 5. Check that cables are connected to the proper connectors, correctly aligned, and tightly connected to the receptacles. 6. Jiggle the cables to check for intermittent opens or shorts. a. If a defective cable is found, follow the procedures listed below: (1) Replace the defective cable in accordance with standard repair procedures. (2) Replace the defective cable with an acceptable replacement cable (refer to para. 11-35. (3) Repair the defective cable in accordance with the repair procedures in para. 11-30. b. If a defective cable is not found, then follow the troubleshooting procedures in TM 11-5820-401-12. 11-7. OBSERVABLE SYMPTOM THE INTERCOM WORKS ON SOME CONTROL BOXES BUT NOT ALL Detailed Assessment Steps 1. Repeat steps 4 thru 6 in para. 11-6. 2. Replace CVC helmet and connecting cable with a known operational CVC helmet and connecting cable. a. If the problem no longer exists, replace the defective CVC helmet or connecting cable. 11-7