VR-120D_serv维修手册含电器原理图

COMMUNICATIONS RECEIVERVERTEX STANDARD CO.,LTD.4-8-8 Nakameguro,Meguro-Ku,Tokyo 153-8644,JapanVERTEX STANDARDUS HeadquartersVR-120D17210 Edwards Rd.,Cerritos,CA 90703,U.SA.International Division8350 N.W.52nd Terrace,Suite 201,Miami,FL 33166.U.S.AYAESU EUROPE B.V.P.O.Box 75525,1118 ZN Schiphol,The NetherlandsTechnical SupplementYAESU UK LTD.Unit 12,Sun Valley Business Park,Winnall CloseWinchester,Hampshire,S023 0LB,U.K.2002 VERTEX STANDARD CO.,LTD.Printed in Japan.VERTEX STANDARD HK LTD.Unit 5,20/F.,Seaview Centre,139-141 Hoi Bun Road,Kwun Tong,Kowloon,Hong KongEHO1IM90AIntroductionThis manual provides technical information necessary forservicing the Yaesu VR-120D Communications Receiver.Information on its installation and operation can be foundin the VR-120D Operating Manual,which is provided withthe receiver,and Accessory information may be found inthe documents accompanying the optional equipment.25600The VR-120D is a high-performance miniatureS280communications receiver providing general coveragereception from 100 kHz to 1300 MHz on the AM,and FM(Wide and Narrow bandwidths)modes(this coverageincludes the AM and FM broadcast bands,HFShort-waveBands up to 16 MHz,VHF and UHF TV bands,the VHFAM aircraft band,and a wide range of commercial andpublic safety frequencies!).Servicing this equipment requires expertise in handlingsurface mount chip components.Attempts by unqualifiedWhile we believe the technical information in this manualpersons to service thisequipment may result in permanentis correct,VERTEX STANDARD assumes no liability fordamage not covered by warranty.For the major circuitdamage that may occur as a result of typographical orboards,each side of the board is identified by the type ofother errors that may be present.Your cooperation inthe majority of components installed on that side.In mostpointing out any inconsistencies in the technicalcases one side has only chip components,and the otherinformation would be appreciated.VERTEX STANDARDhas either a mixture of both chip and lead componentsreserves the right to make changes in this receiver and the(trimmers,coils,electrolytic capacitors,packagedICs,etc.),alignment procedures,in the interest of technologicalor lead components only.improvement,without notification of owners.ContentsSpecifications。2Exploded View Miscellaneous Parts........................3Circuit Description…5Alignment……7Block Diagram….13Board Unit(Schematics,Layouts Parts)CNTLAF Unit ............15RFUnit.23