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Section  IV.  MAINTENANCE  PROCEDURES - TM-11-5820-890-30-5_561
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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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DISASSEMBLY FOR TROUBLESHOOTING. Continued


TM 11-5820-890-30-5 5-18.  DISASSEMBLY  FOR  TROUBLESHOOTING. The  power  amplifier  must  be  disassembled  to  gain  access  to  the  test  points.  Figures  5-5,  5-6,  and  5-7  identify the  test  points  inside  the  power  amplifier. Tools: Flat  tip  screwdriver ITEM ACTION REMARKS High  voltage  (200  V)  and  high  RF  energy  (50  watts)  are  present  in  the  power  amplifier  during testing.  Do  not  disassemble  with  power  applied  to  the  power  amplifier. a.  Power  amplifier Set  on  work  surface  with  heat  sink  side down.  See  figure  5-11. b.   Cover   (10) Using  flat  tip  screwdriver,  fully  loosen  12 captive  screws  and  remove  cover. c.   Power   amplifier Set  on  work  surface  with  heat  sink side  up. d.  Power  amplifier Using  flat  tip  screwdriver,  fully  loosen  12 captive  screws  that  secure  power  amplifier heat  sink  (1)  to  power  amplifier  case  (4). e.  Power  amplifier Separate  power  amplifier  heat  sink  from power  amplifier  case  but  do  not  disconnect any  cables.  Set  on  work  surface  with access  to  desired  test  points. f.   Seal   screw   (5) Using  flat  tip  screwdriver,  remove  and inspect.  If  seal  screw  is  bad,  replace  it. Thread  and  tighten. 5-33


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