Icom IC-M304 Service Manual page 2

INTRODUCTION
This service manual describes the latest service information
for the IC-M304 VHF MARINE TRANSCEIVER at the time
of publication.
MODEL VERSION
IC-M304 U.S.A.
To upgrade quality, any electrical or mechanical parts and
internal circuits are subject to change without notice or
obligation.
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
<SAMPLE ORDER>
1110003491 S.IC TA31136FNG IC-M304
8820001210 Screw 2438 screw
Addresses are provided on the inside back cover for your
convenience.
Icom, Icom Inc. and
Kingdom, Germany, France, Spain, Russia and/or other countries.
SYMBOL COLOR
[USA] Black
[USA-01] Super White
[USA-02] Gray
MAIN UNIT 5 pieces
IC-M304 CHASSIS 10 pieces
logo are registered trademarks of Icom Incorporated (Japan) in the United States, the United
CAUTION
NEVER connect the transceiver to an AC outlet or to a DC
power supply that uses more than 15 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.
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.
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.
An