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File name ic706mkiig_service.pdf

SERVICE MANUAL HF/VHF/UHF ALL MODE TRANSCEIVER i706MKTMG INTRODUCTION This service manual describes the latest service information for the IC-706MKIIG HF/VHF/UHF ALL MODE TRANSCEIVER at the time of publication. VERSION NO. #02, #12 #03, #13 #04, #14 #05, #15 #08, #18 VERSION Europe France Spain U.S.A. Other SYMBOL EUR FRA ESP USA OTH DANGER NEVER connect the transceiver to an AC outlet or to a DC power supply that uses more than 16 V. This will ruin the transceiver. 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 transceiver's front end. 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 1110004080 S.IC µPC2709T IC-706MKIIG MAIN UNIT 05 pieces 10 pieces 8810009020 Screw FH M2.6 x 5 ZK IC-706MKIIG Top cover 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 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. Addresses are provided on the inside back cover for your convenience. TABLE OF CONTENTS SECTION 1 SECTION 2 SECTION 3 SPECIFICATIONS INSIDE VIEWS CIRCUIT DESCRIPTION 3 - 1 RECEIVER CIRCUITS ... 3 - 1 3 - 2 TRANSMITTER CIRCUITS... 3 - 4 3 - 3 PLL CIRCUITS ... 3 - 6 3 - 4 LOGIC CIRCUITS ... 3 - 8 SECTION 4 ADJUSTMENT PROCEDURES 4 - 1 PREPARATION BEFORE SERVICING ... 4 - 1 4 - 2 PLL ADJUSTMENTS...