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TM-11-5820-890-30-5_763
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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 K1 RELAY (CONT)


TM 11-5820-890-30-5 14-33.  REPLACEMENT  OF  CR2  DIODE  ON  K1  RELAY. Tools: Flat  tip  screwdriver Soldering  kit Torque   screwdriver Soldering  aid Flat  tip  bit Needle  nose Flush  cutting Expendable  Supplies: Solder Alcohol Heat sink pliers Lead  measuring  and  forming  tool pliers 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) INSTALLATION e. Diode  (9) f. Diode  (9)  leads g. Relay  (10) h.                     Heat   sink assembly Remove  and  retain  heat  sink  assembly Refer  to  paragraph  14-17 from  power  supply  adapter  chassis  (1). for  heat  sink  removal. 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  discard  defective  diode. Obtain  replacement  diode. Use  lead  measuring  and  forming  tool. Measure   the   center-to-center   dimension between  mounting  leads  of  component at  replacement  site  and  form  the  leads to  this  dimension. Use  soldering  kit,  soldering  aid,  heat sink,  needle  nose  pliers,  and  flush cutting  pliers.  Install  diode,  solder leads  to  tagged  pins  on  relay  (10), trim  the  leads,  and  remove  the  tags. Install  retained  heat  sink  assembly  on power  supply  adapter  chassis  (1). 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. 14-53


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