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Figure 9-1. PA Mount Schematic Diagram
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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 (cont) - TM-11-5820-890-30-5_667


TM 11-5820-890-30-5 9-2. POWER SUPPLY. Continued These  outputs  are  short-circuit  protected.  The  power  supply  will  not  be  damaged  if  an  output  is  shorted  to ground. 9-3. PA MOUNT CHASSIS. The  PA  mount  chassis  provides  the  interconnections  as  shown  in  figure  9-1.  Several  other  functions  are  also performed. The power input is switched on and off by CB1. EMP protection is provided by CR1, VR1, and VR2. Lamp  DS1  indicates  when  power  is  applied  to  the  power  amplifier. Section  Il.  REPAIR  PARTS,  SPECIAL  TOOLS,  TMDE, AND  SUPPORT  EQUIPMENT 9-4. COMMON  TOOLS  AND  EQUIPMENT. For authorized common tools and equipment, refer to the Modified Table of Organization and Equipment (MTOE) applicable  to  your  unit. 9-5. SPECIAL TOOLS, TMDE, AND SUPPORT EQUIPMENT. For the TMDE and support equipment required for DS, see the maintenance allocation chart. It is Appendix B in TM  11-5820-890-20-2. 9-6. REPAIR PARTS. Repair parts are listed and illustrated in the repair parts and special tools list (TM 11-5820-890-30P-3) covering direct  support  maintenance  for  this  equipment. Section  Ill.  TROUBLESHOOTING  PROCEDURES Subject Para Page General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-7 9-3 Operational Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-8 9-4 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-9 9-7 Test Precautions and Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-10 9-8 Explanation of Symbols and Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-11 9-8 Troubleshooting Flowcharts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-12 9-9 9-7. GENERAL. This section provides the troubleshooting procedures used to isolate a defective PA mount. The troubleshooting information is presented in the form of flow charts. They systematically get from a symptom to the bad module. 9-3


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