TM 1-1520-238-T-7 Change 5 11–400.1/(11–400.2 blank) 11–107. SCU 2 NO-GO LH CATWALK – APPEARS ON HOD (AAC) 11–107 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-T-6 TM 1-1520-238-23 Equipment Conditions: Ref Condition TM 1-1520-238-23 Access provisions – L200 cover removed and L295 and L325 doors 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. Open STAB MAN DC (A76)CB6, STAB AUTO DC (A76)CB3, STAB AUTO AC (A76)CB2, and ENG WARN (A76)CB52 circuit breakers. Detach: P682 from (A705)J3, P990 from (A638)J2, P991 from (A638)J3. Check for open between: P682–62 and P991–X, P682–61 and P991–V, P682–60 and P991–K, P431–A4 and P990–W, (A402)TB2–29–C and (A402)J27–A4. Does open exist? YES Repair open wire. Go to paragraph 11–88. NO Go to step 2. 2. Check for short between: P991–X and ground, P991–V and ground, P991–K and ground. Does short exist? YES Repair shorted wire. Go to paragraph 11–88. NO Go to step 3. 3. Check for open between P682–64 and ground. Does open exist? YES Repair open wire. Go to paragraph 11–88. NO Go to step 4. 4. Detach P686 from (A707)J2. Check for open between: P991–E and P686–3, P991–G and P686–35. Does open exist? YES Repair open wire. Go to paragraph 11–88. NO Go to step 5. 5. Check for short between: P991–E and ground, P991–G and ground. Does open exist? YES Repair open wire. Go to paragraph 11–88. NO Go to step 6. 6. Check for open between: P686–2 and ground, P686–34 and ground. Does open exist? YES Repair open wire. Go to paragraph 11–88. NO Replace STAB CONT UNIT 2 (A638) (TM 1-1520-238-23). END OF TASK