TM 1-1520-238-T-5 7–111 7–33. RTR BRK CIRCUIT BREAKER – DOES NOT STAY CLOSED 7–33 Tools: Nomenclature Part Number Tool Kit, Electrical SC518099CLA06 Repairer’s Multimeter, Digital AN/PSM-45 Personnel Required: 68X Armament/Electrical Systems Repairer References: TM 1-1520-238-T-6 TM 1-1520-238-23 Equipment Conditions: Ref Condition TM 1-1520-238-23 Access provisions – L200 panel removed 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 RTR BRK circuit breaker. Check for short between P441–A3 and ground. Does short exist? YES Go to step 2. NO Go to step 3. 2. Detach P463. Check for short between (A76)J1–n 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 Repair shorted wire between P463–n and P441–A3. 3. Detach P441. Check for short between (A402)J5–A4 and ground. Does short exist? YES Repair shorted wire between (A402): J5A–A4 and TB2–9–P, J24–A3 and TB2–9–N, J24–A4 and TB2–9–R. Go to paragraph 7–21. NO Go to step 4. 4. Detach P440. Check for short between (A402)J5–A2 and ground. Does short exist? YES Repair shorted wire between (A402): J5–A2 and TB2–9–W, J16–B17 and TB2–9–T, J24–A7 and TB2–9–Y. Go to paragraph 7–21. NO Go to step 5. 5. Check for short between: P442–A2 and ground, P442–A4 and ground. Does short exist? YES Go to step 8. NO Go to step 6. 6. Check for short between P440–B17 and ground. Does short exist? YES Go to step 7. NO Go to step 8. 7. Detach P18. Check for short between P440–B17 and ground. Does short exist? YES Repair shorted wire between P440–B–17 and P18–2. Go to paragraph 7–21. NO Replace pilot caution/warning panel (TM 1-1520-238-23).