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This service manual describes the latest service information
for the
IC-F4021T/S, IC-F4022T/S and IC-F4023T/S
UHF
TRANSCEIVERS at the time of publication.
Be sure to include the following four points when ordering
replacement parts:
1. 10-digit Icom parts numbers
2. Component name and informations
3. Equipment model name and unit name
4. Quantity required
<
SAMPLE ORDER
>
5030002760 LCD L3-0200HAY-3
IC-F4021T Main unit 5 pieces
8810009561 Screw PH BT M2 × 6 NI-ZK3 IC-F4021T Chassis 10 pieces
Addresses are provided on the inside back cover for your
convenience.
NEVER
connect the transceiver to an AC outlet or to a DC
power supply that uses more than 8 V. This will ruin the
transceiver.
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 (100 mW)
to the antenna connector. This could damage the trans-
ceiver's front end.
To upgrade quality, any electrical or mechanical parts
and internal circuits are subject to change without
notice or obligation.
INTRODUCTION
CAUTION
ORDERING PARTS
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.
Icom, Icom Inc. and
logo are registered trademarks of Icom Incorporated (Japan) in the United States, the United
Kingdom, Germany, France, Spain, Russia and/or other countries.
REPAIR NOTES
MODEL
Version
Symbol
Frequency
Key Pad
IC-F4021T
U.S.A
[USA-02] 400–470 MHz
10-key
[USA-03] 450–520 MHz
IC-F4021S
[USA-02] 400–470 MHz
4-key
[USA-03] 450–520 MHz
IC-F4022T
EURO
[EUR-02]
400–470 MHz
10-key
IC-F4022S
[EUR-12]
4-key
IC-F4023T
GENERAL
[GEN-02] 400–470 MHz
10-key
[GEN-03] 450–520 MHz
IC-F4023S
[GEN-02] 400–470 MHz
4-key
[GEN-03] 450–520 MHz