TM 1-1520-238-T-5 7–125 7–43. EMERG HYD CIRCUIT BREAKER – DOES NOT STAY CLOSED 7–43 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 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 EMERG HYD circuit breaker. Check for short between (A76): J1–k and ground, J1–m 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. On CPG power quadrant panel, set EMERG HYD PWR switch to OFF. On pilot instrument panel, set EMERG HYD pressure switch to OFF. Check for short between P463–k and ground. Does short exist? YES Go to step 6. NO Go to step 3. 3. Detach P238 and P239. Check for short between P463–m and ground. Does short exist? YES Go to step 11. NO Go to step 4. 4. Check for short between (HP1)J6–6 and chassis ground. Does short exist? YES Go to step 5. NO Go to step 9. 5. Remove primary hydraulic pressure transducer (TM 1-1520-238-23). Check for short between (HP1)J6–6 and ground. Does short exist? YES Replace primary hydraulic manifold (TM 1-1520-238-23). NO Replace primary hydraulic pressure transducer. 6. Detach P190. Check for short between P463–k and ground. Does short exist? YES Go to step 7. NO Replace CPG power quadrant panel (TM 1-1520-238-23). 7. Detach wires at (A331)S2–2. Check for short between P463–k and ground. Does short exist? YES Repair shorted wire between: P463–k and P527–A7 J527–A7 and (A331)S2–2. Go to paragraph 7–21. NO Go to step 8.