TM 1-1520-238-T-6 9–510 9–235. SHORT – EXISTS BETWEEN P4-L OR P4-K AND GROUND 9–235 Tools: Nomenclature Part Number Tool Kit, Electrical SC518099CLA06 Repairer’s Multimeter, Digital AN/PSM-45 Personnel Required: 68X Armament/Electrical Systems Repairer One person to assist References: TM 1-1520-238-23 Equipment Conditions: Ref Condition Paragraph 9–148 All dc essential bus 3 pilot station circuit breakers open 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. Check for short between P4-L and ground. Does short exist? YES Go to step 2. NO Go to step 4. 2. Detach wire at CB68-1. Check for short between P4-L and ground. Does short exist? YES Repair shorted wire between P4-L and CB68-1. Go to paragraph 9–233. NO Go to step 3. 3. Attach CB68 wire. Detach wire at CB85-1. Check for short between P4-L and ground. Does short exist? YES Replace bus bar between CB68 and CB85, and check for foreign material (TM 1-1520-238-23). NO Repair shorted wire between CB85-1 and CB3-1. Go to paragraph 9–233. 4. Detach wires at CB61-1. Check for short between P4-K and ground. Does short exist? YES Repair shorted wire between P4-K and CB61-1. Go to paragraph 9–233. NO Go to step 5. 5. Attach CB61 wire. Detach wire at CB54-1. Check for short between P4-K and ground. Does short exist? YES Repair shorted wire between CB61-1 and CB54-1. Go to paragraph 9–233. NO Go to step 6. 6. Attach CB54 wire. Detach wire at CB82-1. Check for short between P4-K and ground. Does short exist? YES Replace bus bar between CB54 and CB82, and check for foreign material (TM 1-1520-238-23). NO Go to step 7. 7. Attach CB82 wire. Detach wires at CB69-1. Check for short between P4-K and ground. Does short exist? YES Repair shorted wire between CB82-1 and CB69-1. Go to paragraph 9–233. NO Go to step 8.