Yaesu FT-857 Technical Supplement

Also see for FT-857 series: Manual Technical supplement Operation manual Brochure & specs Operating manual

Contents

Yaesu FT-857 Technical Supplement Manual pdf 1 page image

1IntroductionThis manual provides technical information necessary for servicing the FT-857/-857D HF/VHF/UHF Ultra-Compact Trans-ceiver.Servicing this equipment requires expertise in handling surface-mount chip components. Attempts by non-qualified per-sons 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 outany inconsistencies in the technical information would be appreciated.© 2007 VERTEX STANDARD CO., LTD. EH007M90CTechnical SupplementSpecifications .................................................. 2Exploded View & Miscellaneous Parts ...... 5Connection Diagram ...................................... 7Block Diagram ................................................. 8Circuit Description ........................................ 9Alignment ...................................................... 12ContentsBoard Unit (Schematics, Layouts & Parts )MAIN Unit ................................................................. 25PLL Unit ..................................................................... 63PA Unit ....................................................................... 75PANEL Unit ............................................................... 93REF Unit ..................................................................... 99PHONE-JACK Unit ................................................. 100VR Unit ..................................................................... 101CONNECTOR Unit ................................................. 102DSP-2 Unit (FT-857 Option) .................................. 103TCXO-9 Unit (Option) ............................................ 106FT-857/-857DVERTEX STANDARD CO., LTD.4-8-8 Nakameguro, Meguro-Ku, Tokyo 153-8644, JapanVERTEX STANDARDUS Headquarters10900 Walker Street, Cypress, CA 90630, 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 KongVERTEX STANDARD (AUSTRALIA) PTY., LTD.Normanby Business Park, Unit 14/45 Normanby RoadNotting Hill 3168, Victoria, Australia