TM 1-1520-238-T-5 7–116 7–36. ROTOR BRAKE – DOES NOT STOP ROTOR ROTATION 7–36 Tools: Nomenclature Part Number Tool Kit, Electrical SC518099CLA06 Repairer’s Multimeter, Digital AN/PSM-45 Personnel Required: 68X Armament/Electrical Systems Repairer (2) References: TM 1-1520-238-T-6 TM 1-1520-238-23 Equipment Conditions: Ref Condition TM 1-1520-238-23 Access provisions – 250R, 250L, 290R, 290L 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. On pilot power quadrant, set RTR BK switch to BRAKE and PWR levers to OFF. Check for 28 VDC at P238–1. Is voltage present? YES Go to step 2. NO Go to step 3. 2. Check for 90 9 ohms resistance between (HP2): J1–5 and J1–1. Is resistance present? YES Repair open wire between P238–5 and GS630–F. Go to paragraph 7–21. NO Go to step 6. 3. Check for 28 VDC at P173–Z. Is voltage present? YES Go to step 5. NO Go to step 4. 4. Check for 28 VDC at (A76)J1–n. Is voltage present? YES Repair open wire between: (A402)TB2–9–N and P463–n, (A402)TB2–9–R and P173–Z, or replace (A402)TB2–9. Go to paragraph 7–21. NO Refer to TM 1-1520-238-T-6 to troubleshoot circuit protection system (dc emergency bus – pilot station). 5. Set RTR BK switch to BRAKE and PWR levers to OFF. Check for open between (A24): J1–Z and J1–b. Does open exist? YES Replace pilot power quadrant (TM 1-1520-238-23). NO Repair open wire between 173–b and P238–1. Go to paragraph 7–21. 6. Remove utility manifold rotor brake ON solenoid (TM 1-1520-238-23). Check for open between (HP2): J1–1 and J9–D, J1–5 and J9–A. Does open exist? YES Replace utility hydraulic manifold (TM 1-1520-238-23). NO Replace utility manifold rotor brake ON solenoid (TM 1-1520-238-23). END OF TASK