yaesu_ft-857_维修说明书手册_操作说明书手册

YAESUVERTEX STANDARD CO.,LTD.4-8-8 Nakameguro,Meguro-Ku,Tokyo 153-8644,JapanVERTEX STANDARDHF/VHF/UHFUS Headquarters10900 Walker Street,Cypress,CA90630,U.S.A.International DivisionULTRA-COMPACT TRANSCEIVER8350 N.W.52nd Terrace,Suite 201,Miami,FL 33166,U.S.A.YAESU EUROPE B.V.FT-857P.O.Box 75525,1118 ZN Schiphol,The NetherlandsYAESU UK LTD.Unit 12.Sun Valley Business Park,Winnall CloseTechnical SupplementWinchester,Hampshire,S023 OLB,U.K.VERTEX STANDARD HK LTD.2003 VERTEXSTANDARD CO.,LTDEH007M90AUnit 5,20/F.,Seaview Centre,139-141 Hoi Bun Road,Kwun Tong,Kowloon,Hong KongIntroductionThis manual provides technical information necessary for servicing the FT-857 HF/VHF/UHF Ultra-Compact TransceiverServicing 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 somecountriesTwo PCB layout diagrams are provided for each double-sided circuit board in the Transceiver.Each side of is referred toby the type ofthe 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.ContentsSpecifications.2Board Unit(Schematics,Layouts Parts)Exploded View Miscellaneous Parts......5MAIN Unit23PLL Unit…49Connection Diagram.Bl0 ck Diagram…8PANEL Unit6Circuit Description9REF Unit.3PHONE-JACK Unit..74Alignment…12CONNECTOR Unit..76DSP-2 Unit (Option).77TCXO-9Unit(Option)……80