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TEST  PRECAUTIONS  AND  NOTES
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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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OPERATIONAL CHECK.  Continued - TM-11-5820-890-30-5_52


TM 11-5820-890-30-5 2-29.  OPERATIONAL  CHECK. Before beginning operational check, install new holding battery to replace holding battery removed for shipment and  ensure  REF  RT  is  loaded  with  Iockset  and  hopset.  Hopset  must  be  loaded  in  channel  2. The  operational  check  provides  a  step-by-step  procedure  for  evaluating  an  RT.  If  the  operational  check  is passed,  the  RT  can  be  returned  to  service.  If  it  does  not  pass  the  test,  the  bad  module  or  the  troubleshooting chart  to  be  used  will  be  identified.  The  troubleshooting  procedures  are  in  paragraph  2-31. The operational check is divided into steps. Each step verifies a particular function. Follow the instruction in the "Action"  column.  Check  the  response.  If  the  response  is  correct,  proceed  with  the  next  lettered  step.  When  a Step  has  been  completed,  proceed  with  the  next  Step.  A  “No  response”  in  the  “Response”  column  means  that any  response  is  not  of  interest. The switch settings for the test equipment are given in the “EQUIPMENT PRESETS” section of each test setup figure. Set the test equipment switches to the indicated presets and then verify the settings. If a test response is incorrect,  check  the  equipment  settings  and  the  test  adapter  cabling  before  going  to  a  troubleshooting  chart  or replacing  a  bad  module. Connect  the  test  setups  only  when  directed,  and  with  the  power  supply  set  to  OFF.  The  large current capacity of the test power supply can cause personal injury. Verify the test setup before turning  the  power  supply  ON. CAUTION During the operational check the RT top cover is removed and a module may also be removed. Whenever  either  cover  is  removed,  take  all  proper  electrostatic  discharge  (ESD)  precautions. Static  electricity  can  damage  the  RT  modules. NOTES: The RT may fail self-test if a signal is input to the AUD/FILL or AUD/DATA connec- tor during self-test. These self-test failures may be ignored during testing unless the  procedure  asks  for  self-test  responses. When calibrating either MOD GEN or FCTN GEN, ensure that the maintenance group TEST EQPT SELECTOR is not in the FREQ CNTR position. Until  piece  parts  are  provisioned,  any  faulty  portion  of  the  front  panel  assembly will  require  replacement  of  the  entire  front  panel  assembly. 2-30


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