TM 1-1520-238-T-7 10–195 10–70. NITROGEN INERT MONITOR INDICATOR – IS NOT ALL BLACK (OK) WITH UNIT 10–70 OPERATING 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 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. In aft avionics bay, reset NITROGEN INERT MONITOR indicator. Does indicator trip to black (OK) and white (FAIL)? YES Go to step 2. NO Go to paragraph 10–67. 2. Check for 28 VDC at J436–B20. Is voltage present? YES Go to step 4. NO Go to step 3. 3. Check for 720 70 ohms resistance between (A335): L47–1 and L47–2. Is resistance present? YES Repair shorted wire between: P436–B20 and (A335)L47–2, J436–B20 and P1085–5, P436–B19 and (A335)L47–1, J436–B19 and P1085–6. Go to paragraph 10–67. NO Replace NITROGEN INERT MONITOR indicator (TM 1-1520-238-23). 4. Remove pressurized air and electrical power. Replace filter element in NIU (TM 1-1520-238-23). Apply electrical power and pressurized air. Reset indicator. Does indicator trip to black (OK) and white (FAIL)? YES Go to step 5. NO Go to paragraph 10–67. 5. Check for open between P1085–7 and P1085–8. Does open exist? YES Replace NIU (TM 1-1520-238-23). NO Go to step 6. 6. Check for open between (A335): S90–1 and S90–2. Does open exist? YES Repair open wire between: P436–B18 and (A335)S90–2, J436–B18 and P1085–7, P436–B17 and (A335)S90–1, J436–B17 and P1085–6. Go to paragraph 10–67. NO Replace NITROGEN INERT MONITOR indicator (TM 1-1520-238-23). END OF TASK