Quantcast TROUBLESHOOTING (cont) - TM-11-5820-890-30-5_862

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OPERATIONAL CHECK.  Continued - TM-11-5820-890-30-5_861
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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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Figure 17-3. Speaker CCA Test Points


TM 11-5820-890-30-5 17-10.  TROUBLESHOOTING. Troubleshooting  is  done  on  a  faulty  LS-671/VRC.  The  steps  to  determine  if  a  LS-671/VRC  is  faulty  and  how  to troubleshoot  it  are  as  follows: a. b. c. d. e. When an LS-671/VRC is received from unit maintenance, inspect it for damage. Repair any damage before  proceeding  with  testing.  See  section  IV  if  repairs  are  necessary. Verify the symptom.  Perform the operational check found in paragraph 17-9. This will direct you to the correct  troubleshooting  flowchart  or  identify  the  fault. Troubleshoot the LS-671/VRC using the flowchart.  It will identify the defective module or component. Replace  the  defective  module  or  component.  Follow  the  procedures  in  section  IV. Verify  the  repair. Repeat  the  operational  check  in  paragraph  17-9  that  failed.  If  it  passes,  then continue with the rest of the operational check. When the operational check is passed, the LS-671/VRC can  be  returned  for  use. The flowcharts provide views of speaker CCA test points. These test points are used to fault isolate to a defective component.  See  figure  16-3  for  the  overall  layout  of  the  speaker  CCA  and  test  points. 17-11. TEST PRECAUTIONS AND NOTES. Set  the  test  power  supply  to  OFF  before  connecting  or  disconnecting  a  test  setup.  Current capacities are large enough to cause personal injury. Equipment can also be damaged if care is not  taken. NOTE The  Principles  of  Operation  section,  functional  block  diagrams,  and  schematic  diagram  figure FO-30 can be used to help fault isolate any unusual problems that might not be covered in the troubleshooting    procedures. 17-7


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