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Make/Model Information:

  • Brand:   Icom
  • Models included:
    • Icom IC-M422

File Information:

  • Type:   Factory Service Manual (FSM)
  • Language:   English (EN)
  • Number of pages:   35
  • File size:  ∼ 2.20 MB
  • File Format:   PDF only
  • SME Watermarks:   None
  • Password lock:   No
  • Edit/copy/modify:   Yes
  • SKU:   ROIC-0111

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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VHF MARINE TRANSCEIVER
iC-m422
S-14131MZ-C1-q
Jul. 2006
SERVICE
INTRODUCTION
REPAIR NOTES
This service manual describes the latest service information
for the IC-M422 VHF MARINE 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 16 V. Such a connection
could cause a fire or electric hazard.
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.
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

5030002790 LCD A0286 IC-M422 Main unit 5 pieces
8810009510 Screw BO 2x4 NIxZU (BT) IC-M422 Chassis 10 pieces
Addresses are provided on the inside back cover for your
convenience.
1. Make sure the problem is internal before dis-assembling
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 30 dB to 40 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, all electrical or mechanical parts and internal
circuits are subject to change without notice or obligation.
MODEL COLORS SYMBOL
IC-M422 BLACK [BLK]
SUPER WHITE [SW]
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.
SECTION 1 SPECIFICATIONS
SECTION 2 INSIDE VIEWS
SECTION 3 DISASSEMBLY INSTRUCTIONS
SECTION 4 CIRCUIT DESCRIPTION
4-1 RECEIVER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4-2 TRANSMITTER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4-3 PLL CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4-4 DSC CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4-5 PUBLIC ADDRESS (PA) CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4-6 POWER SUPPLY CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
4-7 CPU PORT ALLOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
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
6-1 IC-M422 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
6-2 HM-150B/SW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
SECTION 7 MECHANICAL PARTS AND DISASSEMBLY
SECTION 8 SEMICONDUCTOR INFORMATION
SECTION 9 BOARD LAYOUTS
9-1 LOGIC BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
9-2 HM-150B/SW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
9-3 VR BOARD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
9-4 SQL BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
9-5 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
SECTION 10 BLOCK DIAGRAM
SECTION 11 VOLTAGE DIAGRAM
11-1 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1
11-2 LOGIC BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-3
SECTION 12 HM-150B/SW
12-1 MECHANICAL PARTS AND DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1
12-2 VOLTAGE DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1
TABLE OF CONTENTS
SECTION 1 SPECIFICATIONS
M GENERAL
• Frequency coverage : TX
156.025–157.425 MHz
156.050–163.275 MHz
• Type of emission : 16K0G3E, 16K0G2B (DSC)
• Antenna impedance : 50 ? (Nominal)
• Operating temperature range : –4°F to +140°F
• Power supply requirement : 13.8 V DC ±15% (negative ground)
• Current drain (At 13.8 V DC ; approx.) : Receiving
Transmitting
1.5 A (at max. audio)
5.5 A (at 25 W)
• Dimensions (Projections not included) : 6 15/32 (W)×3 1/16 (H)×5 15/32 (D) in.
• Weight (Approx.) : 2 Ib 5 3/4 oz.
M TRANSMITTER
• Output power (At 13.8 V DC) : 25 W (High)/1 W (Low)
• Modulation : Variable reactance frequency modulation
• Maximum frequency deviation : ±5.0 kHz
• Frequency error : Less than ±10 ppm
• Spurious emissions : Less than 70 dBc
• Adjacent channel power : More than 70 dB
• Audio harmonic distortion : Less than 10% (at 60% deviation)
• Residual modulation : More than 40 dB
• Audio frequency response : +1 dB to –3 dB of 6 dB oct. from 300 Hz to 2500 Hz
• Microphone impedance : 2 k?
M RECEIVER
• Receive system : Double conversion superheterodyne system
• Intermediate frequencies : 1st IF: 21.7 MHz, 2nd IF: 450 kHz
• Sensitivity : –13 dBµ typical at 12 dB SINAD
• Squelch sensitivity (At threshold) : Less than –13 dBµ
• Adjacent channel selectivity : More than 70 dB
• Spurious response : More than 70 dB
• Intermodulation rejection ratio : More than 70 dB
• Hum and Noise : More than 40 dB
• Audio frequency response : +1 dB to –3 dB of 6 dB oct. from 300 Hz to 3000 Hz
• Audio output power : 4.5 W typical at 10% distortion with a 4 ? load
• Output impedance (Audio) : 4 ?
Specifications are measured in accordance with TIA/EIA 603
All stated specifications are subject to change without notice or obligation.
YELLOW
SHIELD
to EXT.
SPEAKER
to EXT. PA
SPEAKER
POWER
MP16 (CHASSIS)
to REAR CABLE
MAIN BOARD
• BOTTOM VIEW
H45 H40 H35 H30 H25 H20 H15 H10 H5 H0
HM-150B/SW
• BOTTOM VIEW
H120 H115 H110 H105 H100 H95 H90 H85 H80 H75 H70 H65 H60 H55 H50 H45 H40 H35 H30 H25 H20 H15 H10 H5 H0
The combination of this page and the previous page shows the
unit layout in the same configuration as the actual P.C. Board.
S-14131MZ-C1-q
© 2005–2006 Icom Inc.


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