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Make/Model Information:

  • Brand:   Icom
  • Models included:
    • Icom IC-A24
    • Icom IC-A24E
    • Icom IC-A6
    • Icom IC-A6E

File Information:

  • Type:   Factory Service Manual (FSM)
  • Language:   English (EN)
  • Number of pages:   74
  • File size:  ∼ 8.20 MB
  • File Format:   PDF only
  • SME Watermarks:   None
  • Password lock:   No
  • Edit/copy/modify:   Yes
  • SKU:   ROIC-0058

NOTE:  This list was created by program script and may not accurately represent the text from the source pages.   For full preview please click on 'Download sample':

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S-14115HZ-C1-q
July. 2007
VHF AIR BAND TRANSCEVER
iC-a24e
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-1]
[USA-2]
[CHN] Yes
IC-A24E [EUR] No
[UK] No
[USA-1]
[USA-2]
[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
SECTION 1 SPECIFICATIONS
_ GENERAL
Frequency coverage : TX 118.000136.975 MHz
RX 108.000136.975 MHz [IC-A24/E]
118.000136.975 MHz [IC-A6/E]
WX 161.650163.275 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 : Speci? ed 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 : 10C to +60C; +14F to +140F [GEN], [USA], [CHN]
20C to +55C [EUR]
10C to +50C [AUS]
Frequency stability : 5 ppm
Antenna connector : BNC type (50 O nominal)
Dimensions (projections not included) : 129.3(W) 54(H) 35.5(D) mm; 5 3/32(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 7.2 V 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 : 70100% [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 kO (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 V typical [IC-A24/E]
COM (AM 6 dB S/N) 0.5 V typical [GEN], [USA], [CHN]
COM ( AM 12 dB SINAD with CCITT ? lter) 0.71 V typical [EUR], [AUS]
WX (FM 12 dB SINAD) 0.22 V typical [USA]
Threshold squelch sensitivity : Less than 1 V (AM)
Less than 0.45 V (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 7.2 V DC) : 500 mW typical
(at 10% distortion with an 8 O load, 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 O
Speci? cations are measured in accordance with FCC Part87 ([USA]], [GEN], [CHN]), EN300 676 ([EUR], [UK]) or AS/NZS 4583:1999 ([AUS])
All stated speci? cations are subject to change without notice or obligation.
SECTION 9 BOARD LAYOUTS
LOGIC UNIT (TOP VIEW)
PWR F CLR ANL 121.5
DS2DS3
DS5 DS6
DS8 DS9
H0H5H10H15H20H25H30H35H40H45H50H55H60H65H70H75H80H85H90 V0 V5 V10 V15 V20 V25 V30 V35 V40 V45
1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan S-14115HZ-C1-q
20042007 Icom Inc.
SERVICE
INTRODUCTION
This service manual describes the latest service information
for IC-A24/E/IC-A6/E AIR 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 the of power when
connecting the transceiver.
DO an signal more 20 (100
mW) the connector. could the
transceiver’s front end.
ORDERING PARTS
Be to the four when
replacement parts:
1. 10-digit order numbers
2. Component part number and name
3. Equipment model name and unit name
4. Quantity required

1110003490S.IC TA31136FN IC-A24 5 pieces
8810009560Screw PH BT M26 ZK CHASSIS 10 pieces
Addresses provided the back for
convenience.
REPAIR NOTES
1.
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 are to without or
obligation.
MODELSYMBOL
U.S.A. USA
General GEN
U.S.A.-1 USA-1
U.S.A.-2 USA-2
IC-A24E Europe EUR
U.S.A. USA
General GEN
U.S.A.-1 USA-1
U.S.A.-2 USA-2
IC-A6EEurope 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 - 2 TRANSMITTER CIRCUITS
4 - 3 PLL CIRCUIT
4 - 4 POWER SUPPLY CIRCUITS
4 - 5 CPU PORT ALLOCATIONS
SECTION 5 ADJUSTMENT PROCEDURES
5 - 1 PREPARIOTION
5 - 2 SOFT WEAR ADJUSTMENT
SECTION 6 PARTS LIST
SECTION 7 MECHANICAL PARTS AND DISASSEMBLY
SECTION 8 SEMI-CONDUCTOR INFORMATION
SECTION 9 BOARD LAYOUTS
9 - 1 LOGIC UNIT
9 - 2 RF UNIT
SECTION 10 BLOCK DIAGRAM
SECTION 11 VOLTAGE DIAGRAMS
11 - 1LOGIC UNIT
11 - 2RF UNIT
SECTION 1 SPECIFICATIONS
_ GENERAL
Frequency coverage : TX 118.000136.975 MHz
RX 108.000136.975 MHz*1
WX 161.650163.275 MHz*2
*1: IC-A24/E only. IC-A6/E: 118.000136.975 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 : Speci? ed 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 : 10C to +60C; +14F to +140F [GEN], [USA]
20C to +55C [EUR]
Frequency stability : 5 ppm
Antenna connection : BNC type (50 ? nominal)
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 7.2 V DC) : 5.0 W (PEP) typical, 1.5 W (CW) typical [GEN], [USA]
3.6 W (PEP) typical, 1.0 W (CW) typical [EUR]
Modulation system : Low level modulation
Modulation limiting : 70100% [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 k?
_ 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 V typical [IC-A24/E]
COM (AM 6 dB S/N) 0.5 V typical [GEN], [USA]
COM (AM 12 dB SINAD with CCITT ? lter) 0.71 V typical [EUR]
WX (FM 12 dB SINAD) 0.22 V typical [USA]
Threshold squelch sensitivity : Less than 1 V (AM)
Less than 0.45 V (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 7.2 V DC) : 500 mW typical
(at 10% distortion with an 8 ? load, 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 ?
Speci? cations are measured in accordance with FCC Part87 / EN300 676.
All stated speci? cations are subject to change without notice or obligation.
1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan
S-14115HZ-C1
C 2004 Icom Inc.


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