Icom IC-F3GS service manual Introduction, Ordering Parts, Repair Notes

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INTRODUCTION

This service manual describes the latest service information for the IC-F3GT and IC-F3GSat the time of publication.

To upgrade quality, all electrical or mechanical parts and internal circuits are subject to change without notice or oblig- ation.

DANGER

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 hazard and/or electric shock.

DO NOT expose the transceiver to rain, snow or any liquids.

DO NOT reverse the polarities of the power supply when con- necting the transceiver.

DO NOT apply an RF signal of more than 20 dBm (100mW) to the antenna connector. This could damage the transceiv- er’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

<SAMPLE ORDER>

0910051872

PCB B-5386B

IC-F3GT

MAIN UNIT

1 pieces

8810009510 Screw

BT M2 x 6 ZK

IC-F3GS

Chassis

10 pieces

Addresses are provided on the inside back cover for your convenience.

IC-F3GTIC-F3GS

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 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.

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Contents VHF FM Transceivers Repair Notes IntroductionOrdering Parts Table of Contents ‘ Transmitter Section Specifications‘ General ‘ ReceiverBottom View Inside ViewsMain Unit TOP View Removing the Chassis Panel Disassembly and Option InstructionsDisassembly Instruction Removing the Main UnitOptional Unit Installations SpongeCircuit Description Receiver CircuitsTransmitter Circuits VCC Power Supply Circuits Voltage LinePLL Circuit OPTPort Allocations Output Expander IC IC10Adjustment Procedures PreparationClone SPEGND Software Adjustment DC Power Supply PLL AdjustmentMain PLL AdjustmentPLL Lock VoltageSoftware Adjustment Level SensitivitySquelch SQLParts List Main UnitVariable Ceramic JB 1C Chassis Parts Mechanical Parts and DisassemblyAccessories EP1 EP2 MP1 MP2IC-F3GS parts Diodes SEMI-CONDUCTOR InformationTransistor and FET’S Board Layouts Main UnitIC5 FI2IC8 CirqBlLOCK Diagram Voltage Diagram IC3CIC1 DTA144EU Section Voltage Diagram Avref Vtref Toned Tonem Avcc16, Kamihigashi, Hirano-ku, Osaka 547-0002, Japan 16, Kamihigashi, Hirano-ku, Osaka, 547-0002, Japan
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