Quantcast CHAPTER 4 AMPLIFIER-ADAPTER,  VEHICULAR  AM-7239/VRC  AND  AM-7239B/VRC MAINTENANCE   INSTRUCTIONS

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Page Title: CHAPTER 4 AMPLIFIER-ADAPTER, VEHICULAR AM-7239/VRC AND AM-7239B/VRC MAINTENANCE INSTRUCTIONS
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Section  VII.  PREPARATION  FOR  STORAGE  OR  SHIPMENT
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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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POWER SUPPLY. Continued - TM-11-5820-890-30-5_325


TM 11-5820-890-30-5 CHAPTER 4 AMPLIFIER-ADAPTER,  VEHICULAR  AM-7239/VRC  AND  AM-7239B/VRC MAINTENANCE   INSTRUCTIONS Subject Section Principles of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I Repair Parts, Special Tools, TMDE, and Support Equipment . . . . . . . . . . . . . . . . . . . . . . . II Troubleshooting Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ill Maintenance Procedures for AM-7239/VRC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IV Maintenance Procedures for AM-7239B/VRC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V Preparation for Storage or Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VI Section  I.  PRINCIPLES  OF  OPERATION Subject Para Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 Audio Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 Mounting Adapter Chassis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4 Page 4-1 4-4 4-4 4-97 4-155 4-204 Page 4-1 4-1 4-2 4-2 4-1. INTRODUCTION. The  mounting  adapter’s  three  main  sections  are: Power  Supply,  Amplifier-Adapter  5A1  (power  supply). Circuit  Card  Assembly,  One-Watt  Audio  Amplifier  5A2  (audio  amplifier). Chassis,   Electrical   Equipment,   Amplifier-Adapter   5A3   (mounting   adapter   chassis). They  are  described  in  the  following  paragraphs: 4-2. POWER  SUPPLY. The  power  supply  is  mounted  on  the  back  of  the  mounting  adapter.  It  provides  two  basic  functions: It  suppresses  transients  on  the  input  power  line. It  converts  the  dc  input  power  into  the  dc  voltages  required  by  the  radio  components. The input power must be 22 to 32 V dc. The current required depends on the output loads. Normally, 2 to 12 A of input  current  is  required.  A  block  diagram  of  the  power  supply  is  included  in  figures  FO-14  and  FO-15. a. Transient  Suppressor.  The transient suppressor protects the radio from transients that may be on the input  power  line.  The  transients,  surges,  and  ripple  on  the  input  power  line  must  be  within  the  requirements  of MIL-STD-1275. The output of the transient suppressor is not short-circuit protected. If shorted to ground, CB1 will trip.  Its  output  is  typically  0.5  V  below  the  input  voltage. b. DC-to-DC   Converter.   The  output  of  the  transient  suppressor  is  fed  into  the  dc-to-dc  converter.  It provides  the  following  regulated  output  voltage: 4-1


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