TM 1-1520-238-T-4 6–82.20 Change 5 6–22. HOD NGB 2 READING – DOES NOT DISPLAY AMBIENT TEMPERATURE 6–22 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 TM 55-1500-323-24 TM 9-1230-476-20-2 Equipment Conditions: Ref Condition TM 1-1520-238-23 Access provisions – R200 access panel and RN6, R60 fairings 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. NOTE Nose gearbox will display higher than ambient temperature if recently operated. Entry in ( ) following pin locations is multimeter lead orientation. 1. Detach P60. Check for open between: P60–F and P60–G (red/blk), P60–J and P60–H (blk/red). Does open exist? YES Go to step 3. NO Go to step 2. 2. Check for short between: P60–F and ground, P60–G and ground, P60–H and ground, P60–J and ground. Does short exist? YES Go to step 3. NO Go to step 4. 3. Locate open or short in wire harness between P60 and MT16. Can wire harness be repaired? YES Repair wiring (TM 55-1500-323-24). Go to paragraph 6–13. NO Replace MT16 (TM 1-1520-238-23). Go to paragraph 6–13. 4. Detach P672. Check for short between: P672–86 and ground, P672–87 and ground. Does short exist? YES Repair shorted wire between: P672–86 and ground, P672–87 and ground (TM 55-1500-323-24). NO Go to step 5. 5. Reconnect P60. Check for open between: P672–86 and P672–87 (blk/red). Does open exist? YES Repair open wire (TM 55-1500-323-24). Go to paragraph 6–13. NO Refer to TM 9-1230-476-20-2 to troubleshoot multiplex subsystem. END OF TASK