Icom, Icom Inc. and the Icom logo are registered trademarks of Icom Incorporated (Japan) in Japan, the United States, theUnited Kingdom, Germany, France, Spain, Russia, Australia, New Zealand, and/or other countries.This service manual describes the latest technical informa-tion for the IC-R8600 COMMUNICATIONS RECEIVER at thetime of publication.To upgrade quality, any electrical or mechanical parts and internalcircuits are subject to change without notice or obligation.Be sure to include the following four points when orderingreplacement parts:1. 10-digit Icom part number2. Component name3. Equipment model name and unit name4. Quantity required1110003491 S.IC TA31136FNG IC-R8600 MAIN UNIT 5 pieces8820001210 Screw 2438 screw IC-R8600 Top cover 10 piecesAddresses for the Icom head office and major authorized dis-tributorsare provided on the inside back cover for your con-venience.ORDERING PARTSABOUT THE SDR WIDEBAND RECEIVER CIRCUITS1. Be sure that the problem is internal before disassemblingthe receiver.2. DO NOT open the receiver until you have disconnected itfrom its power source.3. DO NOT short any circuits or electronic parts.4. DO NOT keep power ON for a long time when the receiveris defective.5. READ the instructions of the test equipment thoroughlybefore connecting them to the receiver.REPAIR NOTESINTRODUCTIONMODEL VERSION VERSIONNUMBERIC-R8600USA #02EUR #03USA-01 #04EXP #05FRA #06NEVER connect the receiver to an AC outlet or to a DC powersupply that uses more than the specified voltage. This willruin the receiver.DO NOT expose the receiver to rain, snow or liquids.DO NOT reverse the polarity of the power cable when con-necting the receiver.While ordinary wide band receivers need to have dedicated demodulator circuits for each receive mode, the IC-R8600 utilizesadvanced digital processes that demodulate the incoming signals.The IF signal is sent to the A/D converter, resulting in digital signal, then is processed by a high-speed FPGA and DSP and thenrestored to an analog audio signal.The received signal is processed to be demodulated according to the receive mode, including not only conventional analogcommunications in CW, AM, SSB, FM, WFM, and FSK, but also advanced digital communications in D-STAR, P25, NXDN,dPMR and DCR. This was archived by using Software Defined Radio (SDR) technologyCAUTIONFPGABPF BPF A/D DSP D/A1st LO 2nd LOIFDemodulator
