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Make/Model Information:

  • Brand:   Icom
  • Models included:
    • Icom IC-M501EURO

File Information:

  • Type:   Factory Service Manual (FSM)
  • Language:   English (EN)
  • Number of pages:   40
  • File size:  ∼ 4.60 MB
  • File Format:   PDF only
  • SME Watermarks:   None
  • Password lock:   No
  • Edit/copy/modify:   Yes
  • SKU:   ROIC-0113

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
iM501EURO
SERVICE
MANUAL
SYMBOL
INTRODUCTION
This service manual describes the latest service information
for the IC-M501EURO 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. 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
transceIer’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

1110003200 S.IC TA31136FN IC-M501EURO MAIN UNIT 5 pieces
8810006050 Screw Icom screw E7 IC-M501EURO 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 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 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.
IC-M501EURO
To upgrade quality, any electrical or mechanical parts and
internal circuits are subject to change without notice or
obligation.
VERSION
United Kingdom
Europe
Holland
Germany
TABLE OF CONTENTS
SECTION 1 SPECIFICATIONS
SECTION 2 INSIDE VIEWS
SECTION 3 OPTIONONAL UNIT INSTALLATION
SECTION 4 CIRCUIT DESCRIPTION
4 - 1 RECEIVER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 1
4 - 2 TRANSMITTER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 2
4 - 3 PLL CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 3
4 - 4 DSC CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 3
4 - 5 POWER SUPPLY CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 4
4 - 6 LOGIC CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 4
SECTION 5 ADJUSTMENT PROCEDURES
5 - 1 PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 1
5 - 2 PLL ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 2
5 - 3 TRANSMITTER ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 2
5 - 4 RECEIVER ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 4
SECTION 6 PARTS LIST
SECTION 7 MECHANICAL PARTS
7 - 1 IC-M501EURO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 1
7 - 2 HM-126 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 1
SECTION 8 SEMI-CONDUCTOR INFORMATION
SECTION 9 BOARD LAYOUTS
9 - 1 LOGIC UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 1
9 - 2 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 3
9 - 3 DSC UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 5
9 - 4 ANT UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 5
9 - 5 PWR-CORD UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 5
9 - 6 VR UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 5
9 - 7 SQL UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 5
9 - 8 DIAL UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 5
9 - 9 HM-126 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 6
SECTION 10 BLOCK DIAGRAM
SECTION 11 VOLTAGE DIAGRAM
11 - 1 LOGIC UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 - 1
11 - 2 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 - 2
SECTION 1 SPECIFICATIONS
‘‘ GENERAL
• Frequency coverage : 156.025–157.425 MHz (Tx)
156.025–162.025 MHz (Rx)
• Mode : 16K0G3E (FM)
• Usable channels : All international and USA* channels
*availability depending on version
• 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 6.0 A
Receive max. audio 1.2 A
• Antenna connector : SO-239 (50 ?)
• Dimensions (projections not included) : 165(W)×110(H)×109.4(D) mm
•Weight : 1130 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 : 0.25 µW
•Adjacent channel power : 70 dB
•Residual modulation : 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 : 600 ?
‘ RECEIVER
•Receive system : Double conversion superheterodyne system
•Intermediate frequencies : 1st 21.7 MHz
2nd 450 kHz
•Sensitivity : 6 dBµ emf at 20 dB SINAD
•Squelch sensitivity : –10 dBµ at threshhold
•Adjacent channel selectivity : 70 dB
•Spurious response : 70 dB
•Intermodulation rejection ratio : 68 dB
•Hum and noise : 40 dB
•Audio output power (at 13.8 V DC) : 3.5 W typical at 10% distortion with an 4 ? load
• Audio frequency responce : +1 dB to –3 dB of –6 dB octave from 300 Hz to 3000 Hz
Specifications are measured in accordance with ETS300-162 2nd Edition
All stated specifications are subject to change without notice or obligation.
9-1 LOGIC UNIT
SECTION 9 BOARD LAYOUTS
• TOP VIEW
1-1-32, Kamiminami, Hirano-ku Osaka 547-0003, Japan
S-13702HZ-CD-q
© 2000 Icom Inc.


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