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OPERATIONAL CHECK. Continued - TM-11-5820-890-30-5_335
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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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EXPLANATION  OF  SYMBOLS  AND  NOTES (cont) - TM-11-5820-890-30-5_337


TM 11-5820-890-30-5 4-9. OPERATIONAL  CHECK.  Continued Step 6. INTERCOM AUDIO PATH CHECK FOR AM-7239/VRC AND AM-7239B/VRC. Continued Action Response c.  Place  RT  in  lower  slot. Set   28   V:   ON. Set   CB1:   ON. Set  RT  FCTN: TST. Read RT display. d.  Set  RT  FCTN: OFF. Set CB1: OFF. Remove  RT. e.  Install  shorting  bar,  if  testing  an AM-7239/VRC. c.  RT  display  reads  “Good”.  If  not,  the  snap line  driver  (5A3A2  or  5A3A1W3A2)  is  bad. d.  No  response. e.  Operational  Check  is  complete. 4-10.   TROUBLESHOOTING. Troubleshooting is done on a faulty mounting adapter. The steps to determine if a mounting adapter is faulty and how  to  troubleshoot  it  are  as  follows: a. b. c. d. e. When  a  mounting  adapter  is  received  from  unit  maintenance,  inspect  it  for  damage.  Repair  any damage  before  proceeding  with  testing.  See  section  IV  or  V  if  repairs  are  necessary. Verify the symptom.  Perform the operational check found in paragraph 4-9. This will direct you to the correct  troubleshooting  flowchart  or  identify  the  fault. Troubleshoot  the  mounting  adapter  using  the  flowchart.   It  will  identify  the  defective  module  or component. Replace  the  defective  module  or  component.   Follow  the  procedures  in  section  IV  or  V. Verify the repair.  Repeat the operational check in paragraph 4-9 that failed. If it passes, then continue with  the  rest  of  the  operational  check.  When  the  operational  check  is  passed,  the  mounting  adapter can  be  returned  for  use. 4-11.  TEST  PRECAUTIONS  AND  NOTES. CAUTION Static electricity and stray voltages can damage the mounting adapter. Use an antistatic pad on the  work  surface  and  wear  a  grounded  wrist  strap  when  troubleshooting. All circuit card assemblies in the mounting adapter contain static sensitive devices susceptible to electrostatic   damage.    DO  NOT  attempt   to   replace   components   without   using   protective devices. 4-13


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