FT-857_serv维修手册含电器原理图

YAESUVERTEX STANDARD CO.,LTD.4-8-8 Nakameguro,Meguro-Ku,Tokyo 153-8644,JapanVERTEX STANDARDHF/VHF/UHFUS Headquarters10900 Walker Street,Cypress,CA 90630,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,SO23 OLB,U.K.VERTEX STANDARD HK LTD.2003 VERTEXSTANDARD CO.,LTDEHOO7M90AUnit 5,20/F.,Seaview Centre,139-141 Hoi Bun Road,Kwun Tong,Kowloon,Hong KongA四U可IntroductionThis 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.2 Board Unit (Schematics,Layouts&Parts)Exploded View Miscellaneous Parts......5MAIN Unit.2349Connection Diagram.PLL Unit…Bl0 ck Diagram…8PANEL Unit6Circuit Description9REF Unit.3PHONE-JACK Unit..74VR Unit..8CONNECTOR Unit..76Downloaded by▣DSP-2Unit(Option)….77Amateur Radio DirectoryTCXO-9 Unit (Option)80www.hamdirectory.info