Technical Supplement General Information and Alignment...1 Introduction...1-1 Specifications...1-2 Chip Component Information...1-3 Transceiver Disassembly and PCB Access...2-1 Lithium Battery Replacement...2-3 Pilot Radio and Tube Corporation Lamp Replacement...2-4 Resetting the CPU...2-5 Exploded View & Miscellaneous Parts...2-7 Alignment...2-9 Servicing...3 Circuit Description...3-1 Block Diagram...3-7 Interconnection Diagram...3-8 Board Units (Circuit Diagram, Parts Layout, Parts List)...4 144-VCO Unit...4A-1 430-VCO Unit...4B-1 VR-L Unit...4C-1 VR-R Unit...4D-1 144-Main Unit...4E-1 430-Main Unit...4F-1 Panel Unit...4G-1 CONNECT-1, -2 Unit...4H-1 Optional Board Unit (Circuit Diagram, Parts Layout, Parts List)...5 FTS-22 Tone Squelch Unit...5A-1 MH-36B6J DTMF Microphone...5B-1 MH-42B6J Hand Scanning Microphone...5C-1 The manual provides the technical information necessary for servicing the FT-8100R Dual-Band mobile amateur Transceiver ervicing this equipment requires expertise in handling surface-mount chip components. Attempts by non-qualified persons to service this equipment may result in permanent damage not covered by the warranty, and may be illegal in some countries. Two PCB layout diagrams provided for each double-sided board in this Transceiver Each side of the board is referred to by the type of the majority of components installed on that side ("lead-ed" or "chip-only"). In most cases one side has only chip components, and the other has either a mixture of both chip and leaded components (trimmers, coils, electrolytic capacitors, ICs, etc.), or leaded components only.