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Make/Model Information:

  • Brand:   Icom
  • Models included:
    • Icom IC-M401E

File Information:

  • Type:   Factory Service Manual (FSM)
  • Language:   English (EN)
  • Number of pages:   37
  • File size:  ∼ 2.40 MB
  • File Format:   PDF only
  • SME Watermarks:   None
  • Password lock:   No
  • Edit/copy/modify:   Yes
  • SKU:   ROIC-0109

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-m401e
SERVICE
INTRODUCTION DANGER
This service manual describes the latest service information
for the IC-M401E VHF MARINE TRANSCEIVER at the time
of publication.
4 versions of the IC-M401E have been designed. This ser-
vice manual covers each version.
IC-M401E
VERSION
UK, EUR, HOL,
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

1110003200 S.IC TA31136FN IC-M401E MAIN UNIT 5 pieces
8820001210 Screw 2438 screw IC-M401E Chassis 12 pieces
Addresses are provided on the inside back cover for your
convenience.
NEVER connect the transceiver to an AC outlet or to a DC
power supply that uses more than 16 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 (100mW)
to the antenna connector. This could damage the trans-
ceiver's front end.
REPAIR NOTES
1. Make sure a problem is internal before disassembling
the transceiver.
2. DO NOT open the transceiver until the transceiver is dis-
connected 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 insulat-
ed turning 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 40 dB to 50 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.
To upgrade quality, anyelectrical or mechanical parts and
internal circuits are subject to change without notice or
obligation.
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.
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
4-5 LOGIC CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
4-6 POWER SUPPLY CIRCUITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
4-7 PORT ALLOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
SECTION 5 ADJUSTMENT PROCEDURES
5-1 PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
5-2 PLL ADJUSTMENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
5-3 TRANSMITTER ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
5-4 RECEIVER ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
SECTION 6 PARTS LIST
6-1 IC-M401E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
6-2 HM-132. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
SECTION 7 MECHANICAL PARTS AND DISASSEMBLY
7-1 IC-M401E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
7-2 HM-132. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
SECTION 8 SEMI-CONDUCTOR INFORMATION
SECTION 9 BOARD LAYOUTS
9-1 VR BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
9-2 SQL BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
9-3 HM-132. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
9-4 LOGIC-E BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2
9-5 MAIN-E UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-4
SECTION 10 BLOCK DIAGRAM
SECTION 11 VOLTAGE DIAGRAM
11-1 LOGIC-E BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1
11-2 MAIN-E UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-2
11-3 HM-132 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-3
TABLE OF CONTENTS
SECTION 1 SPECIFICATIONS
‘‘ GENERAL
• Frequency coverage : 156.000–161.450 MHz (Tx)
156.000–163.425 MHz (Rx)
• Mode : 16K0G3E (FM)
16K0G2B (DSC)
• Power supply requirement : 13.8 V DC (negative ground)
• Usable temperature range : –20°C to +60°C
• Frequency stability : ±10 ppm (–20°C to +60°C)
• Current drain (at 13.8 V DC) : Transmit at 25 W 5.5 A (max.)
Receive max. audio 1.5 A (max.)
• Antenna impedance : 50 ? (nominal)
• Input impedance (MIC) : 2 k?
• Output impedance (Audio) : 4 ?
• Dimensions (projections not included) : 153(W)×67(H)×141.6(D) mm
•Weight (approx.) : 950 g
‘‘ 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
•Spurious emissions : Less than 0.25 µW
•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
‘‘ RECEIVER
•Receive system : Double conversion superheterodyne system
•Intermediate frequencies : 1st 21.7 MHz
2nd 450 kHz
•Sensitivity : Less than –2 dBµ emf typical at 20 dB SINAD
•Squelch sensitivity : Less than 0 dBµ emf typical
•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 octave from 300 Hz to 3000 Hz
Specifications are measured in accordance with EN301 025-2, -3
All stated specifications are subject to change without notice or obligation.
• BOTTOM VIEW
The combination of this page and the previous page
shows the unit layout in the same configuration as the
actual P.C. Board.
S-14013MZ-C2
© 2004 Icom Inc. 1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan


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