Icom Ic-m604 User manual

S-14306MZ-C1

Aug. 2006

SERVICE

MANUAL

VHF MARINE TRANSCEVER

iC-m604

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This service manual describes the latest service information

for the IC-M604 VHF MARINE TRANSCEIVER at the time

of publication.

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

power supply that uses more than 15.6 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.

To upgrade quality, any electrical or mechanical parts and

internal circuits are subject to change without notice or

obligation.

MODEL VERSION MICROPHONE COLOR

IC-M604 USA HM-126RB BLACK

USA-1 HM-126RG GRAY

sure to include the following four points when ordering

acement parts:

0-digit order numbers

omponent part number and name

quipment model name and unit name

Quantity required

1110003490 S.IC TA31136FN IC-M604 MAIN UNIT 5 pieces

8820001210 Screw 2438 screw IC-M604 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 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 insu-

lated tuning tool MUST be used for all adjustments.

5. DO NOT keep power ON for a long time when the trans-

ceiver 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 ana-

lyzer when using such test equipment.

8. READ the instructions of test equipment thoroughly

before connecting equipment to the transceiver.

REPAIR NOTES

INTRODUCTION DANGER

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SECTION 1 SPECIFICATIONS

SECTION 2 INSIDE VIEWS

2-1 IC-M604.......................................................................... 2-1

2-2 HM-157(Optionalproduct)........................................................... 2-2

SECTION 3 DISASSEMBLY INSTRUCTION

SECTION 4 CIRCUIT DESCRIPTION

4-1 RECEIVERCIRCUITS .............................................................. 4-1

4-2 TRANSMITTERCIRCUITS........................................................... 4-3

4-3 PLLCIRCUITS .................................................................... 4-4

4-4 DSCCIRCUITS.................................................................... 4-5

4-5 LOGICCIRCUITS.................................................................. 4-5

4-6 POWERSUPPLYCIRCUITS.......................................................... 4-6

4-7 PORTALLOCATIONS............................................................... 4-6

SECTION 5 ADJUSTMENT PROCEDURES

5-1 PREPARATION.................................................................... 5-1

5-2 PLLADJUSTMENTS................................................................ 5-2

5-3 RECEIVERADJUSTMENTS.......................................................... 5-3

SECTION 6 PARTS LIST

SECTION 7 MECHANICAL PARTS

7-1 IC-M604.......................................................................... 7

7-2 HM-126RB/RG..................................................................... 7

7-3 HM-157(Optionalproduct)........................................................... 7

SECTION 8 SEMI-CONDUCTOR INFORMATION

SECTION 9 BOARD LAYOUTS

9-1 VRUNIT ......................................................................... 9

9-2 SQLUNIT........................................................................ 9

9-3 DIALUNIT........................................................................ 9

9-4 CONNECTUNIT................................................................... 9

9-5 LOGICUNIT...................................................................... 9

9-6 MAINUNIT ....................................................................... 9

9-7 AFUNIT.......................................................................... 9

9-8 HM-126RB/RG..................................................................... 9

9-9 HM-157(Optionalproduct)........................................................... 9

SECTION 10 BLOCK DIAGRAM

SECTION 11 WIRING DIAGRAM

SECTION 12 VOLTAGE DIAGRAM

12-1 LOGICUNIT ..................................................................... 12-1

12-2 MAINUNIT ...................................................................... 12-2

12-3 AFUNIT......................................................................... 12-4

12-4 HM-126RB/RG.................................................................... 12-5

12-5 HM-157(Optionalproduct).......................................................... 12-6

TABLE OF CONTENTS

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¤GENERAL

• Frequency coverage : 156.025–157.425 MHz (TX)

156.050–163.275 MHz (RX)

• Mode : 16K0G3E (FM) / 16K0G2B (DSC)

• Power supply voltage : 13.8 V DC ±15 % (negative ground)

• Operating temperature range : –20˚C to +60˚C; –4˚F to +140˚F

• Current drain (at 13.8 V DC) :Transmit at 25 W 5.5 A approx.

Receive max. audio 1.5 A approx.

• Antenna impedance : 50 Ω(nominal)

• Dimensions (projections not included) : 220(W)×110(H)×109.4(D) mm; 821⁄32(W) ×411⁄32(H) ×45⁄16(D) in

• Weight : 1400 g; 3.09 lb

¤TRANSMITTER

• Output power (at 13.8 V DC) : High 25 W

Low 1 W

• Modulation :Variable reactance frequency modulation

• Maximum frequency deviation : ±5.0 kHz

• Frequency stability : ±0.3 kHz

• Spurious emissions : Less than –70 dBc

• Adjacent channel power : More than 70 dB

• Residual modulation : More than 40 dB

• Audio harmonic distortion : Less than 10% at 60% deviation

• Audio frequency response : +1 dB to –3 dB of 6 dB/octave from 300 Hz to 3000 Hz

• Microphone impedance : 2 kΩ

¤RECEIVER

• Receive system : Double conversion superheterodyne system

• Intermediate frequencies : 1st 21.7 MHz*1, 30.15 MHz*2

2nd 450 kHz

• Sensitivity : Less than –10 dBµ at 12 dB SINAD (for both regular and CH70)

• Squelch sensitivity : Less than –10 dBµ at threshold

• Adjacent channel selectivity : More than 80 dB

• Spurious response : More than 80 dB

• Intermodulation rejection ratio : More than 80 dB

• Hum and noise : More than 40 dB

• Audio output power (at 13.8 V DC) : 5.0 W typical at 10% distortion with a 4 Ωload

• Audio frequency responce : +1 dB to –3 dB of –6 dB octave from 300 Hz to 3000 Hz

*1Channel 70, *2Normal channels

Specifications are measured in accordance with TIA/EIA 603

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

SECTION 1 SPECIFICATIONS

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¤VHF MARINE CHANNEL LIST

*1.ylnorewopwoL *2.rewophgihyratnemoM *3.ylnonoitarepoCSD

)zHM(ycneuqerFrebmunlennahC

057.061051.6513030 051.651051.651A30 008.061002.65140

007.061001.6512020

002

.651002.651A40 058.061052.65150 052.651052.651A50A50 003.651003.651606060059.061053.65170 053.651053.651A70A70 004.651004.6518080 80 054.651054.651909090005.651005.651010101055.651055.651111111006.651006.6512121 21

*31 2*31 1

056.651056.651

31 4141

007.651007.651

*51 2*51 1

057.651057.651

*51 1

6161

008.651008.651

*71 1*71 1

058.651058.651

005.161009.651

81 A81A81

009.651009.651 055.161059.651

91 059.651059.651A91A91 *0202 1006.161000.75102 000.751000.751A02

050.651050.651A10

ASU

056.061050.65110

NAC

evieceRtimsnarT

TNI )zHM(ycneuqerFrebmunlennahC

007.161001.75122 001.751001.751A22A22 057.161051.7513232

056.161ylnoxRb

051.751051.751A32 008.161002.751424242058.161052.751525252058.161ylnoxRb52 009.161003.751626262059.161053.751727272000.261004.7518282 82 000.261ylnoxRb82 526.061520.6510606 576.061570.65116 570.651570.651A16A16 527.061521.65126 521.651521.651A26 577.061571.65136 571.651571.651A36 528.061522.6514646 522.651522.651A46A46 578.061572.65156 572.651572.651A56A56 A56 529.061523.65166 *A66A66 1523.651523.651A66

*76 2573.651573.6517676

050.751050.751A12A12

ASU 056.161050.7511212

NAC

evieceRtimsnarT

TNI )zHM(ycneuqerFrebmunlennahC

575.651575.6511717 17 526.651526.6512727 27 576.651576.6513737 37

*07 3*07 3525.651525.651*07 3

527.651527.6514747 47

*57 1*57 1577.651577.651*57 1

*67 1*67 1528.651528.651*67 1

*77 1*77 1578.651578.65177 525.161529.65187 529.651529.651A87A87 575.161579.65197 579.651579.651A97A97 526.161520.75108 520.751520.751A08A08 576.161570.75118 570.751570.751A18A18 527.161521.75128 521.751521.751A28A28 577.16

1571.7513838 571.751571.751A38A38 577.161ylnoxRb38 528.161522.7514848 48 522.751522.751A48 578.161572.751585858572.751572.751A58 529.161523.7516868 68