TM 1-1520-238-T-7 Change 5 11–433 11–132. STAB POS NOT 19 2 NU FOR 70 KNOTS AND COLLECTIVE CENTERED 11–132 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 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 5.25  .30 VDC between P990–D(HI) and P990–E(LO). Is voltage present? YES Go to step 2. NO Go to step 3. 2. Check for 5.25 .30 VDC between P986–D(HI) and P986–E(LO). Is voltage present? YES Replace STAB CONT UNIT 1 (A637) or STAB CONT UNIT 2 (TM 1-1520-238-23). NO Go to step 10. 3. Detach P984 from (MT18)J1. Close STAB AUTO AC (A76)CB2 circuit breaker. Check for +15 2 VDC between P984–A and ground. Is voltage present? YES Go to step 5. NO Go to step 4. 4. Detach P991 from (A638)J3. Check for open between: P991–U and P984–A, P991–U and P986–D, P983–C and P986–E. Does open exist? YES Repair open wire. Go to paragraph 11–88. NO Replace STAB CONT UNIT 2 (TM 1-1520-238-23). 5. Check for short between P984–D and ground. Does short exist? YES Go to step 6. NO Go to step 8. 6. Detach P990 from (A638)J2. Check for short between P984–D and ground. Does short exist? YES Go to step 7. NO Replace STAB CONT UNIT 2 (TM 1-1520-238-23). 7. Detach P682 from (A69)J3. Check for short between P984–D and ground. Does short exist? YES Repair shorted wire between: P984–D and P498–A15, (A323)J498–A15 and (A323)TB1–5–G, (A323)TB1–5–F and (A323)J3–B9, P497–B9 and P682–127, (A323)TB1–5–H and (A323)J2–B13, P494–B13 and P990–D. Go to paragraph 11–88. NO Replace DASEC (A69) (TM 1-1520-238-23).