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REPLACEMENT  OF  DIODE  CR1 - TM-11-5820-890-30-5_502
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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_504


TM 11-5820-890-30-5 4-66. REPLACEMENT OF ZENER DIODE VR1/VR2. Tools: Flat  tip  screwdriver Torque   screwdriver Soldering  kit Cross  tip  screwdriver Expendable  Supplies: Cotton  swabs Solder Alcohol References: Paragraph  4-62  for  removal  and  installation  of  circuit  breaker  CB1. ITEM ACTION REMARKS REMOVAL a.  Mounting  adapter Set  on  work  surface  with  left  side toward  you. b.   Side   access   cover   (16) Remove  and  retain. c.   Mounting   bracket   (20) Using  cross  tip  screwdriver,  remove  and retain  two  screws  (21),  Iockwashers,  and flat  washers  securing  mounting  bracket (20)  to  power  control  chassis.  Remove mounting  bracket  to  allow  for  resoldering. d.   Zener   diode VR1/VR2 (24) INSTALLATION Note  polarity.  Using  soldering  kit,  desolder defective  Zener  diode  VR1/VR2  (24)  from terminal  studs  (25)  on  mounting  bracket (20).  Remove  and  discard  defective  Zener diode  VR1/VR2  (24). e.   Zener   diode Note  polarity.  Using  soldering  kit,  solder VR1/VR2 (24) replacement  diode  to  terminal  studs (25)  on  mounting  bracket  (20). f.   Mounting   bracket   (20) Position  mounting  bracket  to  power  con- trol  chassis.  Using  cross  tip  screwdriver, install  two  retained  screws  (21),  lock- washers,  and  flat  washers  securing mounting  bracket  (20)  to  power  control chassis. Side  access g. cover  (16) Install. Refer  to  paragraph  4-62 for   removal   procedures. See  figure  4-19. Before  and  after  soldering, clean  leads  with  alcohol and  cotton  swabs. These  were  removed  in step  c. See figure 4-14. This was removed  in  step  b. Refer  to  paragraph  4-62  for installation   procedures. 4-180


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