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REPLACEMENT  OF  LAMP  HOLDER  DS1 - TM-11-5820-890-30-5_450
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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 RELAY K1.  Continued


TM 11-5820-890-30-5 4-33.  REPLACEMENT  OF  RELAY  K1. Tools: Cross  tip  screwdriver Torque   screwdriver Soldering  kit Flat  tip  screwdriver Expendable  Supplies: Sealing  compound,  grade  H Solder Cotton  swabs Alcohol References: Figures  4-5  and  4-10  for  location  of  amplifier  adapter  parts. ITEM ACTION REMARKS REMOVAL a.  Mounting  adapter Set  on  work  surface  with  left  side toward  you. b.  Rear  access  cover  (12) Using  flat  tip  screwdriver,  fully  loosen  six captive  screws  (13)  securing  rear  access cover  (12)  to  power  control  chassis  (11). Remove  and  inspect  rear  access  cover replace  if  required. c.  Relay  K1  (31) d.  Diode  CR6  (28) e.   Wires INSTALLATION f.   Wires g.  Diode  CR6  (28) h.  Relay  K1  (31) Using  cross  tip  screwdriver,  remove  and retain  two  screws  (29),  Iockwashers  (23), and  terminal  lugs  (30)  securing  defective relay  K1  (31)  to  two  electrical  posts  (27) on  power  control  chassis  (17). Note  polarity.  Using  soldering  kit,  desolder, remove,  and  retain  diode  CR6  (28)  from defective  relay  K1  (31). Remove  insulation  sleeving  as  required. Using  soldering  kit,  tag  and  desolder  wires from  leads  of  relay  K1  (31).  Remove  and discard  relay  K1. Using  soldering  kit,  solder  tagged  wires  to leads  of  replacement  relay  K1  (31). Remove  wire  tags.  Replace  insulation sleeving  as  required. Note  polarity.  Using  soldering  kit,  solder retained  diode  CR6  (28)  to  leads  X1 and  X2  of  relay  K1  (31). Position  replacement  relay  K1  (31)  on two  electrical  posts  (27)  on  power  control chassis  (17).  Using  cross  tip  screwdriver, install  two  retained  screws  (29),  lockwash- ers  (23),  and  terminal  lugs  (30)  securing relay  K1  to  power  control  chassis  (17). See  figure  4-5. See  figure  4-10. Before  and  after  soldering, clean  wires  and  leads  with alcohol  and  cotton  swabs. Before  and  after  soldering, clean  solder  joints  with alcohol  and  cotton  swabs. Apply  one  drop  of  grade  H sealing  compound  to threads  of  two  retained screws  before  installation. 4-128


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