Quantcast REPLACEMENT OF DIODE CIRCUIT CARD ASSEMBLY (8A2A2) (cont)

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REPLACEMENT  OF  TWO-WIRE  TRANSIENT  PROTECTION  CIRCUIT  CARD ASSEMBLY (8A2A1).  Continued
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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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TM-11-5820-890-30-5_763


14-31. Tools: REPLACEMENT TM 11-5820-890-30-5 OF DIODE CIRCUIT CARD ASSEMBLY (8A2A2). Flat  tip  screwdriver Soldering  kit Torque   screwdriver Soldering  aid Flat  tip  bit Heat sink 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  circuit  (4)  wires d. Four  screws,  flat washers,  and Iockwashers  (5) e. Diode  circuit  (4) INSTALLATION f. g. h. i. Diode  circuit  (4) Four  screws,  flat washers,  and Iockwashers  (5) Diode  circuit  (4)  wires 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  all  wires  soldered to  A2  circuit  near  TB1  terminal  board  (6). Unsolder  each  wire  from  the  circuit. Use  cross  tip  screwdriver.  Remove  and inspect  four  screws  and  flat  washers securing  the  circuit  to  the  chassis. If   damaged,   obtain   replacement. Discard  Iockwashers. Remove  defective  circuit  and  send  it  to supply  for  disposition. Obtain  replacement  circuit  and  four Iockwashers. Use  cross  tip  screwdriver.  Install  and tighten  four  screws,  flat  washers,  and replacement  lockwashers  securing  the circuit  to  the  chassis. Use  soldering  kit,  soldering  aid,  and  heat sink.  Solder  tagged  wires  to  terminals  on the  circuit,  and  remove  wire  tags. Install  retained  heat  sink  assembly  on power  supply  adapter  chassis  (1). Refer  to  paragraph  14-17 for  heat  sink  removal. Before  and  after  soldering, clean  wires  and  terminals with  alcohol  and  cotton swabs. Refer  to  paragraph  14-17 for  heat  sink  installation. 14-51 Heat   sink


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