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REPLACEMENT  OF DIODE CR1.  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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REPLACEMENT  OF  SIDE  PANEL - TM-11-5820-890-30-5_455


TM 11-5820-890-30-5 4-35.  REPLACEMENT  OF  ZENER Tools: Flat  tip  screwdriver Cross  tip  screwdriver Expendable  Supplies: Cotton  swabs References: DIODE  VR1/VR2. Torque   screwdriver Soldering  kit Solder Alcohol Figures  4-5  and  4-10  for  location  of  amplifier  adapter  parts. ITEM ACTION REMARKS REMOVAL a.   Mounting   adapter b.   Rear   access   cover   (12) c.   Two   screws   (22),   flat washers  (24),  and Iockwashers  (23) d.   Zener   diode   VR1/VR2   (18) INSTALLATION e.  Zener  diode  VR1/VR2  (18) f.   Two   screws   (22),   flat washers  (24),  and Iockwashers  (23) g.                    Rear  access cover  (12) Set  on  work  surface  with  left  side toward  you. Remove  and  retain. See  figure  4-5. Refer  to  paragraph  4-33  for removal   procedures. Using  cross  tip  screwdriver,  remove and  retain  two  screws  (22),  flat  washers (24),  and  Iockwashers  (23)  securing mounting  bracket  (21)  to  power  control chassis   (17). Note  polarity.  Using  soldering  kit,  desolder See  figure  4-10. defective  Zener  diode  VR1/VR2  (18)  from terminal  studs  (19)  on  mounting  bracket (21).  Remove  and  retain  insulation  sleeving. Remove  and  discard  defective  Zener diode  VR1/VR2  (18). Install  retained  insulation  sleeving  on replacement  Zener  diode  VR1/VR2  (18). Note  polarity.  Using  soldering  kit,  solder replacement  diode  to  terminal  studs  (19) on  mounting  bracket  (21). Using  cross  tip  screwdriver,  install mounting  bracket  (21)  to  power control  chassis  (17)  using  two  retained screws   (22),   flat   washers   (24),   and Iockwashers  (23). Hold  in  place  and  tighten  six  captive screws  (13)  securing  rear  access  cover (12)  to  power  control  chassis  (10), Using  torque  screwdriver,  torque  screws to  8  to  10  in-lb. Before  and  after  soldering, clean  leads  with  alcohol and  cotton  swabs. These  were  removed  in step  c. See  figure  4-5. This  was  removed  in step  b. 4-131


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