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REPLACEMENT OF TB1 TERMINAL BOARD
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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 CB1 CIRCUIT BREAKER


TM 11-5820-890-30-5 14-34.  REPLACEMENT  OF  K1  RELAY. Tools: Flat  tip  screwdriver Soldering  kit Torque   screwdriver Soldering  aid Flat  tip  bit Heat sink Needle  nose  pliers Cross  tip  screwdriver Expendable  Supplies: Solder Alcohol Cotton  swabs References: Paragraph  14-17  for  removal  and  installation  of  the  heat  sink  assembly  (8A1). ITEM ACTION REMARKS REMOVAL a. Heat  sink  assembly  (2) b. Power  supply  adapter chassis  (1) c. Diode  (9)  leads d. Diode  (9) e. Two  screws,  flat washers,  and Iockwashers  (11) f. Relay (10) INSTALLATION g. Relay (10) h. Two  screws,  flat washers,  and Iockwashers  (11) i. Diode  (9)  leads j.               Heat sink assembly Remove  and  retain  heat  sink  assembly from  power  supply  adapter  chassis  (1). See  figure  13-2. Set  upside  down  on  work  surface  with front  toward  you.  See  figure  13-6. Use  soldering  kit,  soldering  aid,  and  heat sink.  Tag  location  of  the  diode  leads soldered  to  pins  on  the  K1  relay  (10). Unsolder  each  lead  from  the  relay. Remove  and  retain  the  diode. Use  cross  tip  screwdriver.  Remove  and inspect  two  screws  and  flat  washers securing  the  K1  relay  (10)  to  the  chassis. If   damaged,   obtain   replacement. Discard  Iockwashers. Remove  and  discard  defective  relay. Obtain  replacement  relay  and  two Iockwashers. Use  cross  tip  screwdriver.  Install  and tighten  two  retained  screws,  flat  washers, and  replacement  Iockwashers  securing the  K1  relay  (10)  to  the  chassis. Use  soldering  kit,  soldering  aid,  heat sink,  and  needle  nose  pliers.  Install  the retained  diode,  solder  leads  to  tagged pins  on  relay  (10),  and  remove  the  tags. Install  retained  heat  sink  assembly  on power  supply  adapter  chassis  (1). Refer  to  paragraph  14-17 for  heat  sink  removal. Position K1 relay with pins for  wires  closest  to  CB1 circuit   breaker. Before  and  after  soldering, clean  diode  leads  and  relay pins  with  alcohol  and cotton  swabs.  Ensure  that cathode  lead  is  connected to  pin  X1  on  the  relay. Refer  to  paragraph  14-17 for  heat  sink  installation. 14-54


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