Yaesu FT-277R Manual

Yaesu FT-277R Manual Manual pdf 1 page image

1FT-277R Technical Supplement©2010 VERTEX STANDARD CO., LTD. EH022U91ATechnical SupplementSpecifications ....................................................................................................................................................................2Exploded View & Miscellaneous Parts .......................................................................................................................3Block Diagram ..................................................................................................................................................................5Circuit Description ..........................................................................................................................................................7Alignment ..........................................................................................................................................................................9Board Units (Schematics, Layouts & Parts)Main Unit ................................................................................................................................................................... 13FTD-7 DTMF Paging Unit (Option) ........................................................................................................................ 31IntroductionThis manual provides the technical information necessary for servicing the FT-277R UHF FM Transceiver.Servicing this equipment requires expertise in handing surface-mount chip compo-nents. Attempts by non-qualified persons to service this equipment may result inpermanent damage not covered by the warranty, and may be illegal in some coun-tries.Two PCB layout diagrams are provided for each double-sided board in this trans-ceiver. Each side of the board is referred to by the type of the majority of compo-nents installed on that side (“Side A” or “Side B”). In most cases one side has onlychip components (surface-mount devices), and the other has either a mixture ofboth chip and leaded components (trimmers, coils, electrolytic capacitors, ICs, etc.),or leaded components only.While we believe the information in this manual to be correct, VERTEX STANDARDassumes no liability for damage that may occur as a result of typographical or othererrors that may be present. Your cooperation in pointing out any inconsistencies inthe technical information would be appreciated.ContentsFT-277RVERTEX STANDARD CO., LTD.4-8-8 Nakameguro, Meguro-Ku, Tokyo 153-8644, JapanVERTEX STANDARDUS Headquarters10900 Walker Street, Cypress, CA 90630, U.S.A.YAESU 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, AustraliaImportant NoteThe transceiver was assembled using Pb (lead) free solder, based on the RoHSspecification.Only lead-free solder (Alloy Composition: Sn-3.0Ag-0.5Cu) should be usedfor repairs performed on this apparatus. The solder stated above utilizes thealloy composition required for compliance with the lead-free specification,and any solder with the above alloy composition may be used.