Service Manuals, User Guides, Schematic Diagrams or docs for : Icom IC-T81_SM

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IC-T81_SM


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    SERVICE
    MANUAL


MULTIBAND FM TRANSCEIVER
                   INTRODUCTION
This service manual describes the latest service information
for the IC-T81A/E at the time of publication.
       MODEL              VERSION             SYMBOL
                           U.S.A.              USA-1
       IC-T81A            Australia             AUS
                          S.E.Asia              SEA
                           Europe               EUR
       IC-T81E              U.K.                 UK
                            Italy               ITA

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




                        DANGER
NEVER connect the transceiver 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.

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

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

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


1130009370 S.IC  TB31242FN      IC-T81A/E RF UNIT    1 pieces
8810008990 Screw PH BT M2x10 ZK IC-T81A/E 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 transceiver.
2. DO NOT open the transceiver until the transceiver 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 transceiver is defective.
6. DO NOT transmit power into a signal generator or a sweep generator.
7. ALWAYS connect a 40 dB to 50 dB attenuator between the transceiver and a deviation meter or spectrum analyzer when
   using such test equipment.
8. READ the instructions of test equipment thoroughly before connecting equipment to the transceiver.
                                                   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     TRANSMITTER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
          4-3     PLL CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5
          4-4     POWER SUPPLY CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5
          4-5     PORT ALLOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-6


SECTION   5      ADJUSTMENT PROCEDURES
          5-1     PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
          5-2     PLL ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2
          5-3     RECEIVER ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-4
          5-4     TRANSMITTER ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-8


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
          9-3     VCO BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-5


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



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