Icom IC-A24 Bedienungsanleitung

S-14115HZ-C1-q

July. 2007

VHF AIR BAND TRANSCEVER

iC-a24

iC-a24e

iC-a6

iC-a6e

This service manual describes the latest service information

for the IC-A24/E and IC-A6/A6E VHF AIR BAND

TRANSCEIVER at the time of publication.

NEVER connect the transceiver to an AC outlet or to a DC

power supply that uses more than specified. 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 transceiver’s

front-end.

To upgrade quality, any electrical or mechanical parts and

internal circuits are subject to change without notice or

obligation.

MODEL VERSION WX RX VOR

IC-A24

[USA]

Yes

[USA-1]

[USA-2]

[GEN]

[CHN] Yes

IC-A24E [EUR] No

[UK] No

IC-A6

[USA]

Yes

[USA-1]

[USA-2]

[GEN]

[AUS] No

IC-A6E [EUR] No

[UK]

Be sure to include the following four points when ordering

replacement parts:

1. 10-digit Icom parts numbers

2. Component name

3. Equipment model name and unit name

4. Quantity required

1110003491 S.IC TA31136FNG IC-A24 RF UNIT 5 pieces

8820001210 Screw 2438 screw IC-A24 Top cover 10 pieces

Addresses are provided on the inside back cover for your

convenience.

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.

ORDERING PARTS

1. Make sure the 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 tuning 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 Standard Signal

Generator or a Sweep Generator.

7. ALWAYS connect a 50 dB to 60 dB attenuator between

the transceiver and a Deviation Meter or Spectrum

Analyzer when using such test equipment.

8. READ the instructions of test equipment throughly

before connecting a test equipment to the transceiver.

REPAIR NOTES

INTRODUCTION

CAUTION

TABLE OF CONTENTS

SECTION 1 SPECIFICATIONS

SECTION 2 INSIDE VIEWS

SECTION 4 CIRCUIT DESCRIPTION

4 - 1 RECEIVER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 1

4 - 2 TRANSMITTER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 2

4 - 3 PLL CIRCUIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 3

4 - 4 POWER SUPPLY CIRCUITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 4

4 - 5 CPU PORT ALLOCATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 5

SECTION 5 ADJUSTMENT PROCEDURES

5 - 1 PREPARIOTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 - 1

5 - 2 SOFT WEAR ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 - 3

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 DIAGRAMS

11 - 1 LOGIC UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 - 1

11 - 2 RF UNIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 - 2

1 - 1

SECTION 1 SPECIFICATIONS

▄GENERAL

• Frequency coverage :TX 118.000–136.975 MHz

RX 108.000–136.975 MHz [IC-A24/E]

118.000–136.975 MHz [IC-A6/E]

WX 161.650–163.275 MHz [USA] only

• Type of emission : 6K00A3E, 16K0G3E (Weather channel;[USA] only)

• Channel spacing : 25 kHz

• Number of memory channels : 20 channels ×10 banks

• Power supply requirement :

Speciﬁed ICOM's battery packs (BP-208N, BP-209N, BP-210N, BP-211N)

• External power supply requirement : 11.0 V DC

• Current drain (at 7.2 V DC) :Transmit 1.5 A typical

Receive 300 mA typical (AF max.)

70 mA typical (Stand-by)

• Operating temperature range : –10°C to +60°C; +14°F to +140°F [GEN], [USA], [CHN]

–20°C to +55°C [EUR]

–10°C to +50°C [AUS]

• Frequency stability : ±5 ppm

• Antenna connector : BNC type (50 Ωnominal)

• Dimensions (projections not included) : 129.3(W) × 54(H) ×35.5(D) mm;53⁄32(W) × 21⁄8(H) ×113⁄32(D) in

• Weight (antenna, battery pack not included) : 180 g; 611⁄32 oz (Approx.)

▄TRANSMITTER

• RF output power (at 7.2V DC) : 5.0 W (PEP) typical, 1.5 W (CW) typical [GEN], [USA], [CHN]

3.6 W (PEP) typical, 1.0 W (CW) typical [EUR], [AUS]

• Modulation system : Low level modulation

• Modulation limiting : 70–100% [GEN], [USA], [CHN]

• Modulation depth : 85% [EUR]

85% to 95% [AUS]

• Audio harmonic distortion : Less than 10% (at 60% modulation) [GEN], [USA], [CHN]

Less than 10% (at 85%±3 dB modulation) [EUR]

• Hum and noise ratio : More than 35 dB [GEN], [USA], [CHN]

• Spurious emissions : More than 46 dB [GEN], [USA], [CHN]

(except operating frequency ±62.5 kHz range)

• Harmonic spurious emissions : Less than –36 dBm [EUR]

(except operating frequency ±1 MHz range) Less than –26 dBm [AUS]

• Microphone connector impedance : More than 100 kΩ (3-conductor 2.5(d) mm (1⁄10"))

▄RECEIVER

• Receive system : Double conversion superheterodyne

• Intermediate frequencies : 1st 30.05 MHz

2nd 450 kHz

• Sensitivity :

VOR (AM 6 dB S/N) 0.71 µV typical [IC-A24/E]

COM (AM 6 dB S/N) 0.5 µV typical [GEN], [USA], [CHN]

COM (AM 12 dB SINAD with CCITT ﬁlter) 0.71 µV typical [EUR], [AUS]

WX (FM 12 dB SINAD) 0.22 µV typical [USA]

• Threshold squelch sensitivity : Less than 1 µV (AM)

Less than 0.45 µV (FM for WX channel) [USA]

• Selectivity : More than 7.5 kHz/6 dB, Less than 25 kHz/60 dB

except [AUS]

More than 60dB [AUS]

• Spurious response rejection ratio : More than 60 dB (AM), More than 30 dB (FM)

[GEN], [USA], [CHN]

More than 70 dB (AM) [EUR]

More than 60 dB (AM) [AUS]

• Audio output power (at 7.2V DC) :500 mW typical

(at 10% distortion with an 8 Ωload, 30% modulation)

• Hum and noise : More than 40 dB at 30% modulation [GEN], [USA], [CHN]

More than 40 dB at 90% modulation [EUR]

More than 30 dB [AUS]

• External speaker connecter : 3-conductor 3.5(d) mm (1⁄8")/ 8 Ω

Speciﬁcations are measured in accordance with FCC Part87 ([USA]], [GEN], [CHN]), EN300 676 ([EUR], [UK]) or AS/NZS 4583:1999 ([AUS])

All stated speciﬁcations are subject to change without notice or obligation.

9 - 1

SECTION 9 BOARD LAYOUTS

• LOGIC UNIT (TOP VIEW)

PWR F CLR ANL 121.5

ENT

SQL

DS2DS3

DS5

DS6

DS7

DS8

DS9

DS10

MC1

H0H5H10H15H20H25H30H35H40H45H50H55H60H65H70H75

H80H85H90

V0 V5 V10 V15 V20 V25 V30 V35 V40 V45

1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan S-14115HZ-C1-q

SERVICE

MANUAL

INTRODUCTION

This service manual describes the latest service information

for the IC-A24/E/IC-A6/E VHF AIR BAND TRANSCEIVER

at the time of publication.

DANGER

NEVER connect the transceiver to an AC outlet or to a DC

power supply that uses more than 11.5 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

transceiver’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

1110003490 S.IC TA31136FN IC-A24 RF UNIT 5 pieces

8810009560 Screw PH BT M2×6 ZK IC-A24 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 tuning 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 50 dB to 60 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.

To upgrade quality, any electrical or mechanical parts and

internal circuits are subject to change without notice or

obligation.

MODEL VERSION SYMBOL

IC-A24

U.S.A. USA

General GEN

U.S.A.-1 USA-1

U.S.A.-2 USA-2

IC-A24E Europe EUR

IC-A6

U.S.A. USA

General GEN

U.S.A.-1 USA-1

U.S.A.-2 USA-2

IC-A6E Europe EUR

Icom, Icom Inc. and are registered trademarks of Icom Incorporated (Japan) in the United States, the United Kingdom,

Germany, France, Spain, Russia and/or other countries.

IC-A24 IC-A6

TABLE OF CONTENTS

SECTION 1 SPECIFICATIONS

SECTION 2 INSIDE VIEWS

SECTION 4 CIRCUIT DESCRIPTION

4 - 1 RECEIVER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 1

4 - 2 TRANSMITTER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 2

4 - 3 PLL CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 3

4 - 4 POWER SUPPLY CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 4

4 - 5 CPU PORT ALLOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 5

SECTION 5 ADJUSTMENT PROCEDURES

5 - 1 PREPARIOTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 - 1

5 - 2 SOFT WEAR ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 - 3

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 DIAGRAMS

11 - 1 LOGIC UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 - 1

11 - 2 RF UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 - 2

SECTION 1 SPECIFICATIONS

1 - 1

▄GENERAL

• Frequency coverage :TX 118.000–136.975 MHz

RX 108.000–136.975 MHz*1

WX 161.650–163.275 MHz*2

*1: IC-A24/E only. IC-A6/E: 118.000–136.975 MHz

*2: [USA] only

• Type of emission : 6K00A3E, 16K0G3E (Weather channel;[USA] only)

• Channel spacing : 25 kHz

• Number of memory channels : 20 channels ×10 banks

• Power supply requirement : Speciﬁed ICOM's battery pack BP-209N, BP-210N, BP-211N

• External power supply requirement : 11.0 V DC

• Current drain (at 7.2 V DC) :Transmit 1.5 A typical

Receive 300 mA typical (AF max.)

70 mA typical (Stand-by)

• Operating temperature range : –10°C to +60°C; +14°F to +140°F [GEN], [USA]

–20°C to +55°C [EUR]

• Frequency stability : ±5 ppm

• Antenna connection : BNC type (50 Ωnominal)

• Dimensions (projections not included) : 129.3(W) × 54(H) ×35.5(D) mm; 53⁄32(W) × 21⁄8(H) ×113⁄32(D) in

• Weight (without antenna, battery pack) : 180 g; 611⁄32 oz (Approx.)

▄TRANSMITTER

• RF output power (at 7.2V DC) : 5.0 W (PEP) typical, 1.5 W (CW) typical [GEN], [USA]

3.6 W (PEP) typical, 1.0W (CW) typical [EUR]

• Modulation system : Low level modulation

• Modulation limiting : 70–100% [GEN], [USA]

• Modulation depth : 85% [EUR]

• Audio harmonic distortion : Less than 10% (at 60% modulation) [GEN], [USA]

Less than 10% (at 85%±3 dB modulation) [EUR]

• Hum and noise ratio : More than 35 dB [GEN], [USA]

• Spurious emissions : More than 46 dB [GEN], [USA]

(except operating frequency ±62.5 kHz range)

• Harmonic spurious emissions : Less than –36 dBm [EUR]

(except operating frequency ±1 MHz range)

• Microphone connector : 3-conductor 2.5(d) mm (1⁄10")/more than 100 kΩ

▄RECEIVER

• Receive system : Double conversion superheterodyne system

• Intermediate frequencies : 1st 30.05 MHz

2nd 450 kHz

• Sensitivity :

VOR (AM 6 dB S/N) 0.71 µV typical [IC-A24/E]

COM (AM 6 dB S/N) 0.5 µV typical [GEN], [USA]

COM (AM 12 dB SINAD with CCITT ﬁlter) 0.71 µV typical [EUR]

WX (FM 12 dB SINAD) 0.22 µV typical [USA]

• Threshold squelch sensitivity : Less than 1 µV (AM)

Less than 0.45 µV (FM for weather channel)

• Selectivity : More than 7.5 kHz/–6 dB

Less than 25 kHz/–60 dB

• Spurious response rejection ratio : More than 60 dB (AM), More than 30 dB (FM) [GEN], [USA]

More than 70 dB (AM) [EUR]

• Audio power output (at 7.2V DC) :500 mW typical

(at 10% distortion with an 8 Ωload, 30% modulation)

• Hum and noise : More than 40 dB at 30% modulation [GEN], [USA]

More than 40 dB at 90% modulation [EUR]

• Ext. speaker connection : 3-conductor 3.5(d) mm (1⁄8")/ 8 Ω

Speciﬁcations are measured in accordance with FCC Part87 / EN300 676.

All stated speciﬁcations are subject to change without notice or obligation.

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