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Page Title: ELECTRICAL CIRCUITS - lNSPECT/REPLACE
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TM  55-2915-335-30&P 2-23.  ELECTRICAL  CIRCUITS  -  lNSPECT/REPLACE 2-23 This task covers: Replacement of negative and positive secondary brush circuits. INITIAL SETUP Tools: Aircraft  Electrician’s  Tool  Kit,  NSN  5180-00-323-4915 Soldering  Iron  NSN  3439-00-853-8760,  or  equivalent Heater Gun, 200 to 500 deg F, NSN  4940-00-785-1162,  or  equivalent Brush Holder Centering Tool, Item 1, Appendix D Personnel  Required: 68F Aircraft Electrician 66-Series Inspector Equipment  Condition: Pump-end brush holder assembly removed from housing PARA 2-20. Material/Parts: Solder,  Rosin-Core,  QQS-571E Electrical Wire, 18 AWG, NSN - - - Heat Shrink Tubing 0.250 Inch I.D. NSN   5970-00-935-   0082 Heat Shrink Tubing, 0.062 Inch I.D., NSN   5970-00-   935-0083 Thread  Locking  Compound,  NSN  8030-00-111-2762 1. INSPECTION a. b. c. d. e. f. Check for continuity between points A and B. If open, replace negative secondary brush circuit. Check for continuity between points B and C. If zero ohms, RFI capacitor is shorted. If shorted, replace  negative  secondary  brush  circuit. Check for continuity between points C and D. If open, replace positive terminal lead per the in- structions and illustrations in paragraph 2-24. Check  for  continuity  between  point  D  and  impel- ler  housing.  If  zero  ohms,  positive  terminal  is shorted to the housing. If shorted, replace positive terminal per instructions and illustrations in paragraph 2-24. Check for continuity between points E and F. If open,  replace  positive  secondary  brush  circuit. Check general condition of all wiring. If insulation or shrink tubing is cracked or charred, replace circuit. Check brush solder joints for loose fit or cracking. Resolder loose or cracked brush solder joints. GO TO NEXT PAGE 2-80

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