Yaesu FT-897 Technical Supplement

Also see for FT-897D: Brochure & specs Operating manual Technical supplement

Contents

1IntroductionThis manual provides technical information necessary for servicing the FT-897/D HF/VHF/UHF ALL MODE Trans-ceiver.Servicing this equipment requires expertise in handling surface-mount chip components. Attempts by non-qualifiedpersons to service this equipment may result in permanent damage not covered by the warranty, and may be illegal in somecountries.Two PCB layout diagrams are provided for each double-sided circuit board in the Transceiver. Each side of is referred toby the type of the majority of components installed on that side (“leaded” or “chip-only”). In most cases one side has onlychip components, and the other has either a mixture of both chip and leaded components (trimmers, coils, electrolyticcapacitors, ICs, etc.), or leaded components only.While we believe the technical information in this manual to be correct, VERTEX STANDARD assumes no liability fordamage that may occur as a result of typographical or other errors that may be present. Your cooperation in pointing out anyinconsistencies in the technical information would be appreciated.©2010 VERTEX STANDARD CO., LTD. EH012M90DTechnical SupplementFT-897/-897DHF/VHF/UHFALL MODE TransceiverSpecifications ................................................... 2Exploded View & Miscellaneous Parts ....... 4Block Diagram .................................................. 5Circuit Description ......................................... 7Alignment ....................................................... 10ContentsBoard Unit ( Schematics, Layouts & Parts )MAIN Unit ............................................................... 23PLL Unit .................................................................... 69PA Unit ...................................................................... 89PANEL Unit ........................................................... 117MIC Unit ................................................................. 137VR Unit ................................................................... 140BATT-CONN Unit ................................................. 141REF Unit .................................................................. 142TCXO-9 Unit .......................................................... 143VERTEX STANDARD CO., LTD.4-8-8 Nakameguro, Meguro-Ku, Tokyo 153-8644, JapanVERTEX STANDARDUS Headquarters10900 Walker Street, Cypress, CA 90630, U.S.A.YAESU UK LTD.Unit 12, Sun Valley Business Park, Winnall CloseWinchester, Hampshire, SO23 0LB, U.K.VERTEX STANDARD HK LTD.Unit 5, 20/F., Seaview Centre, 139-141 Hoi Bun Road,Kwun Tong, Kowloon, Hong KongVERTEX STANDARD (AUSTRALIA) PTY., LTD.Normanby Business Park, Unit 14/45 Normanby RoadNotting Hill 3168, Victoria, Australia