TM-9-2350-275-BD Battlefield Damage Assessment and Repair for M113 Family Download
Page 120 of 224
TM 9-2350-275-BD COMMUNICATIONS SYSTEM b. If the problem still exists, go to step 5. 5. Replace KY-57 (KY-38) with a known operational KY-57 (KY-38). a. If the problem no longer exists, repair the KY-57 (KY-38) using standard maintenance procedures. b. If the problem still exists, refer to the troubleshooting procedures in TM 11- 5810-256-OP-4. 11-14. OBSERVABLE SYMPTOM: UNABLE TO COMMUNICATE USING THE KY-57 Detailed Assessment Steps 1. Check the KY-57 (KY-38) system by attempting to communicate in the PT (plain text) mode with a distant station. a. If PT b. If PT communication is not possible, refer to paragraph 11-5. communication is possible, go to step 2. 2. Make sure the proper code is being used by zeroing the KY-57 (KY-38) and then resetting it with the proper code. (Refer to applicable Communications-Electronics Operation Instructions (CEOI).) 3. Attempt to communicate with a different distant station to make sure the proper code settings are being used. a. If communication is restored, attempt to notify the original distant staiton in PT that he is using improper code. b. If communication is not established, go to step 4. 4. Make sure the proper pre-operating procedures are being used. (Refer to TM 11- 5810-256-OP-4.) 5. Make sure the KY-57 (KY-38) system is properly installed by checking all cables. 6. Replace the KY-57 (KY-38) with a known operational a. If communication has been restored, repair maintenance procedures. KY-57 (KY-38). the KY-57 using standard b. If communication has not been restored, refer to the troubleshooting procedures in TM 11-5810-256-OP-4. 11-14