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Page Title: Section IV. MAINTENANCE PROCEDURES
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TM 11-5820-890-30-5 Section  IV.  MAINTENANCE  PROCEDURES Subject Para General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32 Operational Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33 Repair Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34 Replacement of Recovers.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35 Replacement  of  Modules  1A2,  1A6,  1A7,  1A12,  1A13,  1A14,  and  1A15  .  .  .  .  .  .  .  .  .  .  .  .  .  2-36 Replacement of impedance Matching Network (1A1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-37 Replacement of Power Supply (1A3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-38 Replacement of ECCM Module (1A5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-39 Replacement of Control Module (1A4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-40 Replacement of lF/Demodulator (1A8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-41 Replacement of Tuner/Mixer (1A9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-42 Replacement of Synthesizer (1A10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-43 Replacement of Exciter/Power Amplifier (1A11) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-44 Replacement of RF Cables 1W1 through 1W5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-45 Replacement of RT Chassis (1A16) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-46 Replacement of Data Entry Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-47 Replacement of Threaded Screw Inserts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-48 Replacement of RT Front Panel Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-49 Replacement of Display Circuit Card Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-50 Replacement of Audio Flex Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-51 Replacement of Switch Flex Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-52 Replacement of Front Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-53 Replacement of Observation Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-54 2-32.  GENERAL. Page 2-158 2-158 2-158 2-159 2-160 2-162 2-163 2-164 2-165 2-166 2-167 2-168 2-169 2-170 2-171 2-173 2-175 2-177 2-181 2-182 2-184 2-181 2-182 This  section  includes  the  operational  check  and  the  repair  procedures.  The  operational  check  is  used  to  verify the   operation   of   a   repaired   RT.   It   is   also   used   to   verify   the   symptom   of   a   faulty   RT.   It   will   identify   the troubleshooting  chart  to  be  used.  When  a  bad  module  is  identified,  replace  it  using  the  procedures  in  this section. 2-33.  OPERATIONAL  CHECK. Perform  the  operational  check  in  paragraph  2-29  (page  2-30)  to  verify  correct  RT  operation. 2-34.  REPAIR  PROCEDURES. Repair of the RT consists of replacing a bad module. A module is replaced by removing it and installing a good module.  Procedures  for  doing  this  follow. a. General Instructions. The  following  instructions  apply  to  all  repair  tasks. 1. Set RT FCTN switch to STW. 2. Remove  any  cables  connected  to  the  RT. 3. inspect  the  RT  for  damage.  Repair  any  obvious  physical  damage. 4. Use the module extractor to remove the circuit card assemblies. It is included in the maintenance tool  kit.  It  is  used  as  follows: a) Locate  the  module  to  be  removed. b)  Hook  the  module  extractor  through  the  two  holes  in  the  top  corners  of  the  module. c) Hold the module extractor with one hand. Place the other hand on the RT with the fingers of that hand  resting  on  top  of  the  module  to  be  removed. d)  Pull  steadily  with  the  module  extractor  until  the  module  connector  is  free  of  the  parent  board. e) Remove  the  module. f) Unhook  the  module  extractor  from  the  module. 2-158


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