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Make/Model Information:

  • Brand:   Icom
  • Models included:
    • Icom IC-M34

File Information:

  • Type:   Factory Service Manual (FSM)
  • Language:   English (EN)
  • Number of pages:   30
  • File size:  ∼ 2.20 MB
  • File Format:   PDF only
  • SME Watermarks:   None
  • Password lock:   No
  • Edit/copy/modify:   Yes
  • SKU:   ROIC-0107

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-14313XZ-C1
Dec. 2006
VHF MARINE TRANSCEVER
This service manual describes the latest service information
for the IC-M34 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 8 V. This will ruin the
transceiver.
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 SYMBOL AC ADAPTER
IC-M34 U.S.A. [USA] BC-174A
South East Asia [SEA] BC-174E
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

1110003491 S.IC TA31136FNG IC-M34 MAIN UNIT 5 pieces
8820001210 Screw 2438 screw IC-M34 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
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.
REPAIR NOTES
INTRODUCTION
CAUTION
CONTENTS
SECTION 1 SPECIFICATIONS
SECTION 2 INSIDE VIEWS
SECTION 3 DISASSEMBLY INSTRUCTIONS
SECTION 4 CIRCUIT DESCRIPITON
4-1 RECEIVER CIRCUITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4-2 TRANSMITTER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4-3 PLL CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4-5 POWER SUPPLY CIRCUITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4-6 CPU PORT ALLOCATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
SECTION 5 ADJUSTMENT PROCEDURES
5-1 PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
5-2 SOFTWARE ADJUSTMENT (FREQUENCY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
5-3 SOFTWARE (TRANSMIT AND RECEIVE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
SECTION 6 PARTS LIST
SECTION 7 MECHANICAL PARTS AND DISASSEMBLY
SECTION 8 SEMICONDUCTOR INFORMATION
SECTION 9 BOARD LAYOUTS
SECTION 10 BLOCK DIAGRAM
SECTION 11 VOLTAGE DIAGRAM
11-1 MAIN UNIT (Left side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1
11-2 MAIN UNIT (Right side). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-2
SECTION 12 BC-173
SECTION 1 SPECIFICATIONS
M GENERAL
• Frequency coverage : TX
156.025–157.425 MHz
156.050–163.275 MHz
• Type of emission : 16K0G3E
• Antenna impedance : 50 ? (Nominal)
• Operating temperature range : –20°C to +60°C; –4°F to +140°F
• Power supply requirement
(negative ground)
: Specified Icom's battery pack
(Operating voltage; 7.5 V DC)
• Current drain (At 13.8 V DC ; approx.) : Receiving;
Transmitting;
0.2 A (at max. audio)
1.5 A (at 5.0 W)
1.0 A (at 2.0 W)
0.7 A (at 1.0 W)
• Dimensions (Projections not included) : 62×141.5×43 mm; 2 7/16 (W)×5 9/16 (H)×1 11/16 (D) in.
• Weight (Approx.) : 305 g; 10 3/4 oz. (incl. BP-252, FA-SC58V and MB-109)
M TRANSMITTER
• Output power (At 13.8 V DC) : 5 W (HI POWER)/2 W (AL_HI POWER)/1 W (LOW POWER)
• Modulation : Variable reactance frequency modulation
• Maximum frequency deviation : ±5 kHz
• Frequency stability : ±10 ppm
• Spurious emissions : –68 dBc typ.
• Adjacent channel power : 70 dB
• Audio harmonic distortion : 10% (at 60% deviation)
• Residual modulation : 40 dB
• Audio frequency response : +1 dB to –3 dB of 6 dB oct. from 300 Hz to 3000 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 : –12 dBµ (0.25 µV) typ. at 12 dB SINAD
• Squelch sensitivity : –9 dBµ (0.35 µV) typ. (at threshold)
• Adjacent channel selectivity : 70 dB typ.
• Spurious response : 70 dB typ.
• Intermodulation rejection ratio : 70 dB typ.
• Hum and Noise : 40 dB
• Audio frequency response : +1 dB to –3 dB of –6 dB oct. from 300 Hz to 3000 Hz
• Audio output power : 0.35 W typical at 10% distortion with an 8 ? load
• Audio output impedance : 8 ?
Specifications are measured in accordance with TIA/EIA-603
All stated specifications are subject to change without notice or obligation.
1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan S-14313XZ-C1
© 2006 Icom Inc.


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