TM 1-1520-238-T-6 9–492 Change 1 9–222. SHORT – EXISTS BETWEEN P4–J OR P4–G AND GROUND 9–222 Tools: Nomenclature Part Number Tool Kit, Electrical SC518099CLA06 Repairer’s Multimeter, Digital AN/PSM-45 Personnel Required: 68X Armament/Electrical Systems Repairer References: TM 1-1520-238-23 Equipment Conditions: Ref Condition Paragraph 9–148 All dc essential bus 2 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-G and ground. Does short exist? YES Go to step 2. NO Go to step 5. 2. Detach wire end at CB56-1. Check for short between P4-G and ground. Does short exist? YES Repair shorted wire between CB56-1 and P4-G. Go to paragraph 9–220. NO Go to step 3. 3. Attach CB56 wire and detach wire end at CB59-1. Check for short between P4-G and ground. Does short exist? YES Replace bus bar between CB56 and CB59, and check for foreign material (TM 1-1520-238-23). NO Go to step 4. 4. Attach CB59 wire and detach wire ends at CB73-1. Check for short between P4-G and ground. Does short exist? YES Repair shorted wire between CB59-1 and CB73-1. Go to paragraph 9–220. NO Repair shorted wire between CB79-1 and CB73-1. Go to paragraph 9–220. 5. Detach wire at CB46-1. Check for short between P4-J and ground. Does short exist? YES Repair shorted wire between CB46-1 and P4-J. Go to paragraph 9–220. NO Go to step 6. 6. Attach wire CB46-1 and detach wire end at CB91-1. Check for short between P4-J and ground. Does short exist? YES Repair shorted wire between: CB46-1 and CB66-1, CB49-1 and CB89-1. Go to paragraph 9–220. NO Repair shorted bus bar between CB89-1 and CB91-1, and check for foreign material (TM 1-1520-238-23). END OF TASK