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TM 11-5820-890-30-5
CHAPTER 14
POWER SUPPLY ADAPTER, VEHICULAR MX-10862/VRC
MAINTENANCE INSTRUCTIONS
Subject
Section
Page
Principles of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I
14-1
Repair Parts, Special Tools, TMDE, and Support Equipment . . . . . . . . . . . . . . . . . . . . . . . II
14-3
Troubleshooting Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ill
14-3
Maintenance Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IV
14-27
Preparation for Storage or Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V
14-76
Section I. PRINCIPLES OF OPERATION
Subject
Para
Page
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-1
14-1
Heat Sink Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-2
14-1
Two-Wire Transient Protection Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-3
14-2
Power Supply Adapter Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-4
14-2
14-1. INTRODUCTION.
The Power Supply Adapter, Vehicular MX-10862/VRC (power supply adapter) has three main sections:
a.
Heat Sink Assembly, Power Supply Adapter (heat sink assembly) (8A1)
b.
Circuit Card Assembly, Two-Wire Transient Protection (8A2A1)
c.
Chassis, Electrical Equipment, Power Supply Adapter (power supply adapter chassis) (8A2)
They are described in the following paragraphs:
14-2. HEAT SINK ASSEMBLY.
The heat sink assembly is mounted on the bottom of the power supply 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 schematic diagram of the heat sink assembly is included in figure FO-19.
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.
14-1
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