Service Manuals, User Guides, Schematic Diagrams or docs for : Icom icr3

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   SERVICE
   MANUAL



COMMUNICATIONS RECEIVER
                    INTRODUCTION
This service manual describes the latest service information
for the IC-R3 at the time of publication.

To upgrade quality, all electrical or mechanical parts and
internal circuits are subject to change without notice or oblig-
ation.




                         DANGER
NEVER connect the receiver to an AC outlet or to a DC power
supply that uses more than 16 V. Such a connection could
cause a fire hazard and/or electric shock.

DO NOT expose the receiver to rain, snow or any liquids.

DO NOT reverse the polarities of the power supply when con-
necting the receiver.

DO NOT apply an RF signal of more than 20 dBm (100mW)
to the antenna connector. This could damage the receiver's
front end.




                  ORDERING PARTS
Be sure to include the following four points when ordering
replacement parts:

1.   10-digit order numbers
2.   Component part number and name
3.   Equipment model name and unit name
4.   Quantity required


1140008440 S.IC  AK93C10A        IC-R3   LOGIC UNIT 5 pieces
8810009560 Screw BT M2 x 6 ZK    IC-R3   Chassis    10 pieces

Addresses are provided on the inside back cover for your
convenience.




                                                       REPAIR NOTES
1.   Make sure a problem is internal before disassembling the receiver.
2.   DO NOT open the receiver until the receiver is disconnected from its power source.
3.   DO NOT force any of the variable components. Turn them slowly and smoothly.
4.   DO NOT short any circuits or electronic parts. An insulated turning tool MUST be used for all adjustments.
5.   DO NOT keep power ON for a long time when the receiver is defective.
6.   READ the instructions of test equipment thoroughly before connecting equipment to the receiver.
                                                 TABLE OF CONTENTS


SECTION   1      SPECIFICATIONS

SECTION   2      INSIDE VIEWS

SECTION   3      DISASSEMBLY INSTRUCTIONS

SECTION   4      CIRCUIT DESCRIPTION
          4-1       RECEIVER CIRCUITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 1
          4-2       PLL CRICUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 5
          4-3       FM-TV CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 6
          4-4       POWER SUPPLY CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 8
          4-5       PORT ALLOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 8


SECTION   5      ADJUSTMENT PROCEDURES
          5-1       PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 1
          5-2       PLL ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 3
          5-3       RECEIVER ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 5
          5-4       TFT LCD AND FM-TV UNIT ADJUSTMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 7


SECTION   6      PARTS LIST

SECTION   7      MECHANICAL PARTS AND DISASSEMBLY

SECTION   8      SEMI-CONDUCTOR INFORMATION

SECTION   9      BOARD LAYOUTS
          9-1       VCO AND RF-B UNITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 1
          9-2       FM-TV UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 3
          9-3       LOGIC UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 5
          9-4       RF UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 7


SECTION   10 BC-135 OPTIONAL DESKTOP CHARGER INFORMATION
          10 - 1 PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 1
          10 - 2 DISASSEMBLY INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 1
          10 - 3 VOLTAGE DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 2
          10 - 4 BOARD LAYOUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 3


SECTION   11     BLOCK DIAGRAM

SECTION   12 VOLTAGE DIAGRAM
          12 - 1 VCO UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 - 1
          12 - 2 RF-B UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 - 2
          12 - 3 FM-TV UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 - 3
          12 - 4 LOGIC UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 - 4
          12 - 5 RF UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 - 5
         SECTION 1                          SPECIFICATIONS

M     GENERAL                                                                     



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