ICOM F3GS GT free download

File name service manual IC F3gt-gs.pdf

SERVICE MANUAL VHF FM TRANSCEIVERS INTRODUCTION This service manual describes the latest service information for the IC-F3GT and IC-F3GS at the time of publication. To upgrade quality, all electrical or mechanical parts and internal circuits are subject to change without notice or obligation. 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 connecting the transceiver. DO NOT apply an RF signal of more than 20 dBm (100mW) to the antenna connector. This could damage the transceiver's front end. ORDERING PARTS Be sure to include the following four points when ordering replacement parts: 1. 2. 3. 4. 10-digit order numbers Component part number and name Equipment model name and unit name Quantity required 0910051872 PCB B-5386B 8810009510 Screw BT M2 x 6 ZK IC-F3GT IC-F3GS MAIN UNIT 1 pieces Chassis 10 pieces IC-F3GT IC-F3GS Addresses are provided on the inside back cover for your convenience. REPAIR NOTES Make sure a problem is internal before disassembling the transceiver. DO NOT open the transceiver until the transceiver is disconnected from its power source. DO NOT force any of the variable components. Turn them slowly and smoothly. DO NOT short any circuits or electronic parts. An insulated turning tool MUST be used for all adjustments. DO NOT keep power ON for a long time when the transceiver is defective. DO NOT transmit power into a signal generator or a sweep generator. 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. 1. 2. 3. 4. 5. 6. 7. TABLE OF CONTENTS SECTION SECTION SECTION 1 2 3 3-1 3-2 SPECIFICATIONS INSIDE VIEWS DISASSEMBLY AND OPTION INSTRUCTIONS DISASSEMBLY INSTRUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 - 1 OPTIONAL UNIT INSTALLATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 - 2 SECTION 4 4-1 4-2 4-3 4-4 4-5 CIRCUIT DESCRIPTION RECEIVER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 1 TRANSMITTER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 2 PLL CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 3 POWER SUPPLY CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 3 CPU PORT CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 4 SECTION 5 5-1 5-2