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File name ic2800h_servicemanual.pdf

DUAL BAND FM TRANSCEIVER iC-2800h INTRODUCTION This service manual describes the latest service information for the IC-2800H FM TRANSCEIVER at the time of publication. MODEL VERSION Europe Italy IC-2800H U.S.A. S. E. Asia C. S. America SYMBOL EUR ITA USA SEA CSA 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 (100 mW) to the antenna connector. transceiver's front end. This could damage the 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 order numbers 2. Component part number and name 3. Equipment model name and unit name 4. Quantity required 1110002750 S.IC TA75S01F 8810008450 Screw M4 Ч 8 ZK IC-2800H MAIN UNIT 1 piece IC-2800H CHASSIS 6 pieces 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 or 60 dB attenuator between the transceiver and a deviation meter or spectrum analyser 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 SECTION 4 4-1 4-2 4-3 4-4 4-5 SPECIFICATIONS INSIDE VIEWS DISASSEMBLY INSTRUCTIONS CIRCUIT DESCRIPTION RECEIVER CIRCUITS ... 4 ­ 1 TRANSMITTER CIRCUITS ... 4 ­ 3 PLL CIRCUIT ... 4 ­ 4 POWER SUPPLY CIRCUITS ... 4 ­ 5 CPU PORT ALLOCATIONS ... 4 ­ 5 SECTION 5 5-1 5-2 5-3 ADJUSTMENT PROCEDURES PREPARATION... 5 ­ 1 PLL AND TRANSMITTER ADJUSTMENTS ...