Yaesu FT-897 Technical Supplement

Also see for FT-897: Manual Brochure & specs Operating manual Service manual Operating manual

Contents

IntroductionThis manual provides technical information necessary for servicing the FT-897 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 insome countries.Two PCB layout diagrams are provided for each double-sided circuit board in the Transceiver. Each side of is referredto by the type of the majority of components installed on that side (“leaded” or “chip-only”). In most cases one side hasonly chip components, and the other has either a mixture of both chip and leaded components (trimmers, coils, electrolyt-ic capacitors, ICs, etc.), or leaded components only.While we believe the technical information in this manual to be correct, VERTEX STANDARD assumes no liabilityfor damage that may occur as a result of typographical or other errors that may be present. Your cooperation in pointingout any inconsistencies in the technical information would be appreciated.©2002 VERTEX STANDARD CO., LTD. Printed in Japan.Technical SupplementFT-897HF/VHF/UHFALL MODE TransceiverSpecifications ................................................... 2Exploded View & Miscellaneous Parts....... 4Block Diagram ................................................. 5Circuit Description ........................................ 7Alignment....................................................... 10ContentsBoard Unit ( Schematics, Layouts & Parts)MAIN Unit ............................................................... 21PLL Unit ................................................................... 53PA Unit ..................................................................... 59PANEL Unit ............................................................. 73MIC Unit .................................................................. 81VR Unit ..................................................................... 82BATT-CONN Unit .................................................. 83REF Unit ................................................................... 84VERTEX STANDARD CO., LTD.4-8-8 Nakameguro, Meguro-Ku, Tokyo 153-8644, JapanVERTEX STANDARDUS Headquarters10900 Walker Street, Cypress, CA 90630, U.S.A.International Division8350 N.W. 52nd Terrace, Suite 201, Miami, FL 33166, U.S.A.YAESU EUROPE B.V.P.O. Box 75525, 1118 ZN Schiphol, The NetherlandsYAESU 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 Kong