Icom IC-M504 Service Manual page 2

INTRODUCTION
This service manual describes the latest service information
for the IC-M504 MARINE TRANSCEIVER at the time of
publication.
MODEL VERSION
IC-M504 U.S.A.
To upgrade quality, all 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 Icom parts number
2. Component name and informations
3. Equipment model name and unit name
4. Quantity required
<SAMPLE ORDER>
1130007610 S.IC µPD3140GS
8810010610 Screw PH B0 M3×8 SUS IC-M504
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-1] Gray
[USA-2] Black
IC-M504 Main unit 5 pieces
Chassis 10 pieces
logo are registered trademarks of Icom Incorporated (Japan) in the United States, the United
PRECAUTIONS
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 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 trans-
ceiver's front end.
REPAIR NOTES
1. Make sure the 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 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 40 dB to 50 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.