TM 1-1520-238-T-6 9–606 9–311. CONTINUITY – DOES NOT EXIST BETWEEN (A77)J4-C AND CB29-1 OR 28 VDC 9–311 IS NOT PRESENT AT P769-C 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 TM 1-1520-238-23 Electrical power distribution box cover removed Paragraph 9–304 All dc emergency 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. On pilot ELEC PWR panel, set BATT/EXT PWR switch to EXT PWR. Check for 28 VDC at (A402)J32-G. Does short exist? YES Go to step 2. NO Go to step 3. 2. Set BATT/EXT PWR switch to OFF. Check for open between (A77)J4-C and CB29-1. Does short exist? YES Repair open wire between (A77)J4-C and CB13-1. Go to paragraph 9–304. NO Repair open wire between P461-G and P769-C. Go to paragraph 9–304. 3. Set BATT/EXT PWR switch to OFF. Check for short between P461-G and ground. Does open exist? YES Go to step 4. NO Go to paragraph 9–23 to troubleshoot dc electrical power generation. 4. Check for short between (A77)J4-C and ground. Does short exist? YES Go to step 5. NO Repair shorted wire between P461-G and P769-C. Go to paragraph 9–304. 5. Detach wire at CB13-1. Check for short between (A77)J4-C and ground. Does short exist? YES Repair shorted wire between (A77)J4-C and CB13-1. Go to paragraph 9–304. NO Replace bus bar between CB29 and CB13, and check for foreign material (TM 1-1520-238-23). END OF TASK