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DUAL BAND FM TRANSCEVER

S-14325XZ-C1
Mar. 2007
INTRODUCTION CAUTION
This service manual describes the latest service information NEVER connect the transceiver to an AC outlet or to a DC
for the IC-2820H DUAL BAND FM TRANSCEVER at the power supply that uses more than 15 V. This will ruin the
time of publication. transceiver.
MODEL VERSION DO NOT expose the transceiver to rain, snow or any liquids.
USA-01
AUS-01 DO NOT reverse the polarities of the power supply when
IC-2820H KOR-01 connecting the transceiver.
TPE-01 DO NOT apply an RF signal of more than 20 dBm (100 mW)
EXP-01 to the antenna connector (J1). This could damage the
transceiver's front end.

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

ORDERING PARTS REPAIR NOTES
Be sure to include the following four points when ordering 1. Make sure a problem is internal before disassembling
replacement parts: the transceiver.
2. DO NOT open the transceiver until the transceiver is
1. 10-digit order numbers disconnected from its power source.
2. Component part number and name 3. DO NOT force any of the variable components. Turn
3. Equipment model name and unit name them slowly and smoothly.
4. Quantity required 4. DO NOT short any circuits or electronic parts. An
insulated tuning tool MUST be used for all adjustments.
5. DO NOT keep power ON for a long time when the
transceiver is defective.
1110003491 S.IC TA31136FNG IC-2820H MAIN UNIT 5 pieces
6. DO NOT transmit power into a signal generator or a
8820001210 Screw 2438 screw IC-2820H Top cover 10 pieces
sweep generator.
Addresses are provided on the inside back cover for your 7. ALWAYS connect a 50 dB to 60 dB attenuator between
convenience. the transceiver and a Modulation Analyzer 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.
CONTENTS

SECTION 1 SPECIFICATIONS

SECTION 2 INSIDE VIEWS

SECTION 3 DISASSEMBLY INSTRUCTIONS

SECTION 4 CIRCUIT DESCRIPITON
4-1 RECEIVER CIRCUITS ............................................................................................................... 4-1
4-2 TRANSMITTER CIRCUITS ....................................................................................................... 4-4
4-3 FREQUENCY SYNTHESIZER .................................................................................................. 4-6
4-4 POWER SUPPLY CIRCUITS ..................................................................................................... 4-8
4-5 PORT ALLOCATIONS ............................................................................................................... 4-9

SECTION 5 ADJUSTMENT PROCEDURES
5-1 PREPARATION .......................................................................................................................... 5-1
5-2 FREQUENCY ADJUSTMENT ................................................................................................... 5-2
5-3 TRANSMIT ADJUSTMENT ....................................................................................................... 5-3
5-4 RECEIVE ADJUSTMENT .......................................................................................................... 5-4

SECTION 6 PARTS LIST

SECTION 7 MECHANICAL PARTS

SECTION 8 BOARD LAYOUTS

SECTION 9 BLOCK DIAGRAM

SECTION 10 VOLTAGE DIAGRAM

SECTION 11 HM-133

SECTION 12 UT-123 (Optional product)
SECTION 1 SPECIFICATIONS

1-1
SECTION 2 INSIDE VIEWS

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