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TROUBLESHOOTING FLOWCHARTS. Continued - TM-11-5820-890-30-5_560
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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


TM 11-5820-890-30-5 Section  IV.  MAINTENANCE  PROCEDURES Subject Para General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15 Operational Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-16 Repair Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-17 Disassembly for Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-18 Replacement of Power Amplifier Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-19 Replacement of Decoder Control (6A2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-20 Replacement of Power Amplifier Heat Sink (6A3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-21 Replacement of Power Amplifier Case (6A1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-22 Page 5-32 5-32 5-32 5-33 5-35 5-35 5-36 5-38 5-15.  GENERAL. This  section  includes  the  operational  check  and  the  repair  procedures.  The  operational  check  is  used  to  verify the operation of a repaired power amplifier. lt is also used to verify the symptom of a faulty power amplifier. It will identify the troubleshooting chart to be used. When a bad module is identified, replace it using the procedure in this  section. 5-16.  OPERATIONAL  CHECK. Perform  the  operational  check  found   in  paragraph  5-10  to  verify  the  proper  operation  of  the  power  amplifier. 5-17.  REPAIR  INSTRUCTIONS. Repair  of  the  power  amplifier  consists  of  replacing  a  bad  module.  A  module  is  replaced  by  removing  it  and installing  a  good  one.  Procedures  for  doing  this  follow: a. b. 5-32 General Instructions. The  following  instructions  apply  to  all  repair  tasks. 1. Remove  all  cables  connected  to  the  power  amplifier. 2. Inspect  the  power  amplifier  for  damage,  Repair  any  obvious  physical  damage. 3. Handle  all  modules  carefully. 4. Before  installing  a  module,  check  the  connectors  or  terminals  for  bent  or  broken  pins. Do  not  install  if  damaged. 5. After  the  repair,  perform  the  operational  check. Repair   Precautions. CAUTION Static  electricity  and  stray  voltages  can  damage  the  decoder  control  (6A2).  Ground  the  power amplifier  and  all  tools  before  removing  the  decoder  control.  Use  a  grounded  wrist  strap  when handling  the  decoder  control. CAUTION Steps marked with          must be performed exactly as written. They are critical in maintaining the  nuclear  hardness  of  the  power  amplifier.  Seals  must  not  be  damaged.  All  screws  must  be torqued  to  the  limits  specified  in  the  replacement  procedures.


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