Service Manuals, User Guides, Schematic Diagrams or docs for : Icom icr2

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   SERVICE
   MANUAL



COMMUNICATIONS RECEIVER
                    INTRODUCTION

This service manual describes the latest service information
for the IC-R2 at the time of publication.

     MODEL             VERSION                 SYMBOL
                        Europe                   EUR
                         Italy                   ITA
                        Taiwan                   TPE
      IC-R2             U.S.A.                   USA
                        Canada                   CAN
                                                 OTH
                         Other
                                                OTH-1

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 3.5 V. Such a connection
could cause a fire hazard and/or electric.

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

DO NOT reverse the polarities of the power supply when
connecting the receiver.

DO NOT apply an RF signal of more than 20 dBm (100mW)
to the antenna connector. This could damage the re-
ceiver'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



8930046581       LCD Contact   IC-R2       LOGIC UNIT 5 pieces
8810009560 Screw PH BO M2x6 ZK IC-R2       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 CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
          4-3     POWER SUPPLY CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4
          4-4     PORT ALLOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4


SECTION   5      ADJUSTMENT PROCEDURES
          5-1     PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
          5-2     PLL ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-3
          5-3     RECEIVER ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-5


SECTION   6      PARTS LIST

SECTION   7      MECHANICAL PARTS AND DISASSEMBLY

SECTION   8      SEMI-CONDUCTOR INFORMATION

SECTION   9      BOARD LAYOUTS
          9-1     LOGIC UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-1
          9-2     RF UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-3


SECTION   10 BLOCK DIAGRAM

SECTION   11     VOLTAGE DIAGRAM
          11-1    LOGIC UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-1
          11-2    RF UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-2
      SECTION 1                       SPECIFICATIONS

M   GENERAL                                                                    M   RECEIVER



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