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SERVICE MANUAL VHF/UHF ALL MODE TRANSCEIVER i910H INTRODUCTION This service manual describes the latest service information for the IC-910H VHF/UHF ALL MODE TRANSCEIVER at the time of publication. 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. VERSION No. #02 #04 #06 #07 VERSION Europe Australia U.S.A. Korea SYMBOL EUR AUS USA-1 KOR 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. 2. 3. 4. 10-digit order numbers Component part number and name Equipment model name and unit name Quantity required 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. 1110003140 IC LA1150N IC-910H MAIN UNIT 5 pieces Cover 10 pieces 8810005770 Screw BiH M3Ч8 ZK IC-910H Addresses are provided on the inside back cover for your convenience. TABLE OF CONTENTS SECTION 1 SECTION 2 2-1 2-2 SPECIFICATIONS INSIDE VIEWS IC-910H . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 - 1 UX-910 (OPTIONAL UNIT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 - 3 SECTION 3 SECTION 4 SECTION 5 SECTION 6 SECTION 7 SECTION 8 SECTION 9 9-1 9-2 9-3 9-4 9-5 9-6 9-7 9-8 9-9 DISASSEMBLY AND OPTION INSTRUCTIONS CIRCUIT DESCRIPTION ADJUSTMENT PROCEDURES PARTS LIST MECHANICAL PARTS SEMI-CONDUCTOR INFORMATION BOARD LAYOUTS VR-A BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 1 VR-B BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 1 RIT BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .