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Page Title: 4. LOSS OF INTERFACE POWER 24 VDC
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TM 9-2320-364-20-4 2-3122 4.  LOSS OF INTERFACE POWER 24 VDC. INITIAL SETUP 1. Repair wire 1784 (see schematic Fig 2-76) or notify DS Maintenance. Verify repair, go to Step 7 of this Fault. START YES NO 24 vdc present at polarity protection terminal B. Wire 1784 from 24 vdc polarity   protection to connector   MC136 terminal D faulty. Wire 1784 from MC136 to   CB28 faulty. Circuit breaker CB28 faulty. Wire 1784 from CB28 to   MC136 faulty. Wire 1784 from MC136 to   MC129 faulty. Wire 1784 from MC136 to   MC130 faulty. KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION Voltage Test. STE/ICE-R #89 If wire 1784 from polarity protection device to connector MC136 is loose, faulty or shorted, 22 to 28 vdc will not be present at powerbox. 2-37. INTERFACE TROUBLESHOOTING (CONT) Tools and Special Tools Tool Kit, General Mechanic’s:  Automotive (Item 74, Appendix G) STE/ICE-R (Optional) (Item 3, Appendix G) Multimeter (Item 44, Appendix G) Equipment Condition Engine OFF, (TM 9-2320-364-10) Parking brake applied, (TM 9-2320-364-10) Wheels chocked, (TM 9-2320-364-10) Are 22 to 28 vdc measured at connector MC136 terminal D? WARNING Read   WARNING on Page 2-3123

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