TM 1-1520-238-T-7 11–122 11–16. TRIM CIRCUIT BREAKER DOES NOT STAY CLOSED – FORCE TRIM ON 11–16 Tools: Nomenclature Part Number Tool Kit, Electrical SC518099CLA06 Repairer’s Multimeter, Digital AN/PSM-45 Extractor, Relay CTJ-RO6 Personnel Required: 68X Armament/Electrical Systems Repairer One person to assist References: TM 1-1520-238-T-6 TM 1-1520-238-23 WARNING Turn off power before detaching or attaching wires and connectors. High current 28 VDC or 115 VAC is present. Failure to do so could result in death or serious injury. 1. Open TRIM circuit breaker (CB87). Check for short between (A76)J1–Y and ground. Does short exist? YES Refer to TM 1-1520-238-T-6 to troubleshoot circuit protection system (dc emergency bus – pilot station). NO Go to step 2. 2. Detach P441. Check for short between P463–Y and ground. Does short exist? YES Repair shorted wire between P441–B10 and P463–Y. Go to paragraph 11–12. NO Go to step 3. 3. Detach wires from (A402): TB3–9–G, TB3–9–H, and TB3–9–J. Check for short between (A402): J24–A14 and ground, J18–A13 and ground, J18–A14 and ground. Does short exist? YES Go to step 4. NO Go to step 5. 4. Detach wires from (A402): TB3–9–G, TB3–9–J, and TB3–9–H. With relay (A402)XK–9/10 removed, check for short between (A402): J24–A14 and ground, J18–A13 and ground, J18–A14 and ground, wire ends from: TB3–9–G and ground, TB3–9–H and ground, TB3–9–J and ground. Does short exist? YES Repair shorted wire between (A402): J24–A14 and K1–9/10–A3, J18–A13 and K1–9/10–B3, J18–A14 and K1–9/10–C3, TB3–9–G and K1–9/10–C2, TB3–9–H and K1–9/10–B2, TB3–9–J and K1–9/10–A2. Go to paragraph 11–13. NO Replace relay (A402)XK–9/10 (TM 1-1520-238-23). 5. Detach wires from (A402): TB3–9–K, TB3–9–L and TB3–9–M. Check for short between (A402): J11–B6 and ground, J11–B7 and ground, J24–B10 and ground. Does short exist? YES Repair shorted wire between (A402): J24–B10 and TB3–9–K, J11–B7 and TB3–9–L, J11–B6 and TB3–9–M. Go to paragraph 11–13. NO Go to step 6.