TM 1-1520-238-T-7 11–298 11–66. 28 VDC BUCS NO-GO – APPEARS ON HOD 11–66 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 – R295 door 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 circuit breaker panel, close ASE BUCS circuit breaker. Check for 28 VDC at P1–33. Is voltage present? YES Go to step 2. NO Refer to TM 1-1520-238-T-6 to troubleshoot circuit protection system (dc essential bus 3 – pilot station). 2. Check for 28 VDC at P682–68. Is voltage present? YES Go to step 3. NO Go to step 4. 3. Check for open between: P682–67 and GS601–B, P682–65 and GS601–G. Does open exist? YES Repair open wire. Go to paragraph 11–23. NO (ACA) Replace DASEC (TM 1-1520-238-23). (ACB) Go to step 6. 4. Check for open between (A402): J1–33 and J27–A10. Does open exist? YES Repair open wire. Go to paragraph 11–23. NO Go to step 5. 5. Check for open between: P431–A10 and P493–B12, P499–A10 and P682–68, and P499–A10 and P682–66. Does open exist? YES Repair open wire. Go to paragraph 11–23. NO Repair open wire between (A323): J4–B12 and TB3–4–R, J5–A10 and TB3–4–N. Go to paragraph 11–23. 6. (ACB) Detach filter adapter A705. Check for open through pins: A705–65, A705–66, A705–67, A705–68. Does open exist? YES Replace filter adapter (TM 1-1520-238-23). NO Replace DASEC (TM 1-1520-238-23). END OF TASK