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REPLACEMENT OF TEST POINTS AND POWER PLUGS
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TM-11-5820-890-30-5 Ground Non-Icom Radio Sets Consisting of: Receiver-Transmitter Radio RT-1439/VRC (NSN 5896-01-195-0827) Manual
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REPLACEMENT OF VOLTAGE REGULATORS


3-29.  REPLACEMENT Tools: Soldering  kit Expendable  supplies: Alcohol References: TM 11-5820-890-30-5 OF  POWER  SUPPLY  CCA. 3/16-inch   nutdriver Cross  tip  screwdriver,  #0  point Cotton  swabs Solder Paragraph  3-25  for  removal  and  installation  of  test  adapter  from  maintenance  group  lid. Figure  3-12  for  illustration  of  power  supply  circuit  card  assembly  (CCA). ITEM ACTION REMARKS REMOVAL a.   Wires b.   Four   hex   nuts   (60),   lock- washers  (61),  flat  washers (62),  and  screws  (66) c.   Four   spacer   sleeves   (64) d.  Power  supply  CCA  (65) INSTALLATION e.   Wires f.   Power   supply   CCA   (65) g.   Four   hex   nuts   (60),   lock- washers  (61),  flat  washers (62),  and  screws  (66) Note  positions  of  all  wires  soldered  to power  supply  CCA  (65).  Using  soldering kit,  desolder  all  wires  from  CCA. Using  cross  tip  screwdriver  and  3/16-inch nutdriver,  remove  and  retain  four  hex  nuts, Iockwashers,  flat  washers,  and  screws securing  CCA  to  power  supply  mounting bracket  (63).  Note  orientation  of  CCA’s component  side  with  respect  to  mounting bracket. Remove  and  retain. Remove  and  discard. Using  soldering  kit,  solder  all  wires  to correct  positions  on  CCA. Install  four  retained  screws  (66)  through replacement  CCA  and  four  retained  spac- er  sleeves  (64).  Place  CCA  with  its  com- ponent  side  in  correct  orientation  on  pow- er  supply  mounting  bracket  (63)  with screws  inserted  through  holes  in  bracket. Using  cross  tip  screwdriver  and  3/16-inch nutdriver,  install  and  tighten  four  retained hex  nuts,  Iockwashers,  and  flat  washers on  four  screws  securing  CCA  to  mounting bracket. See  figure  3-12  (sheet  3). Before  and  after  soldering, clean  solder  joints  with cotton  swabs  and  alcohol. These  were  removed  in steps  b  and  c. These  were  removed  in step  b. 3-99


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