his manual provides technical information necessary for servicing the FT-8900R Transceiver. Servicing 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 are provided for each double-sided circuit board in the transceiver. Each side of thr board is referred to by the type of the majority of Components installed on that side (“leaded” 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. pecifications .................................................... 2 Exploded View & Miscellaneous Parts ........ 3 Connection Diagram ........................................ 4 Circuit Description ........................................... 5 Alignment ........................................................ 11 Board Unit (Schematics, Layouts & Parts) Main Unit ..................................................................... 17 Panel Unit ..................................................................... 47 Panel-Sub Unit ............................................................. 53 VR-L Unit ..................................................................... 55 VR-R Unit ..................................................................... 56