ft-7900r_usa維修手冊

1、Dual Band FM Transceiver FT-7900R Technical SupplementIntroductionThis manual provides technical information necessary for servicing the FT-7900R Transceiver.Servicing this equipment requires expertise in handling surfac

2、e-mount chip components. Attempts by non-qualifiedpersons to service this equipment may result in permanent damage not covered by the warranty, and may be illegal in some countries.Two PCB layout diagrams are provided fo

3、r each double-sided circuit board in the transceiver. Each side of thr board isreferred to by the type of the majority of components installed on that side (“l(fā)eaded” or “chip-only”). In most cases one side has only chip

4、components, and the other has either a mixture of both chip and leaded components (trimmers, coils, electrolytic capacitors, ICs, etc.), or leaded components only.While we believe the technical information in this manual

5、 to be correct, Vertex Standard assumes no liability for dam- age that may occur as a result of typographical or other errors that may be present. Your cooperation in pointing out any inconsistencies in the technical inf

6、ormation would be appreciated.Specifications ................................................ A-1Exploded View & Miscellaneous Parts ..... B-1Block Diagram................................................C-1Circuit De

7、scription ....................................... D-1Alignment ....................................................... E-1ContentsBoard Unit (Schematics, Layouts & Parts)MAIN Unit.....................................

8、............ F-1PANEL Unit ............................................. G-1CH Unit ..................................................... H-1©2009 VERTEX STANDARD CO., LTD. EH016M93AVERTEX STANDARD CO., LTD

9、. 4-8-8 Nakameguro, Meguro-Ku, Tokyo 153-8644, Japan VERTEX STANDARD US Headquarters 10900 Walker Street, Cypress, CA 90630, U.S.A. YAESU UK LTD. Unit 12, Sun Valley Business Park, Winnall Close Winchester, Hampshire, SO

10、23 0LB, U.K. VERTEX STANDARD HK LTD. Unit 5, 20/F., Seaview Centre, 139-141 Hoi Bun Road, Kwun Tong, Kowloon, Hong Kong VERTEX STANDARD (AUSTRALIA) PTY., LTD. Normanby Business Park, Unit 14/45 Normanby Road Notting Hill

11、 3168, Victoria, AustraliaImportant NoteThe transceiver was assembled using Pb (lead) free solder, based on the RoHS specification.Only lead-free solder (Alloy Composition: Sn-3.0Ag-0.5Cu) should be used for repairs perf

12、ormed on this appara- tus. The solder stated above utilizes the alloy composition required for compliance with the lead-free specifica- tion, and any solder with the above alloy composition may be used.B-1Exploded View &

13、amp; Miscellaneous PartsM2090034A FANP1090984 CONNECTOR (Ver: USA)RA0552200 LCD SPACERRA0540800 LCD HOLDERG6090155 LCDRA1110800 RUBBER KNOBRA0540700 LIGHT GUIDERA0551900 REFLECTOR SHEETRA0540900 INTER CONNECTORRA1111300

14、FRONT PANEL ASSY (W/ WINDOW, DOUBLE FACE TAPE)RA1118000 KNOBRA1121500 ENCODER KNOBRA1110900 KNOBQ9000816 ROTARY ENCODER (W/ HEX NUT*, WASHER*)RA0551800 DIFFUSER SHEETCH UNITPANEL UNITRA1118000 KNOBS5000288 FAN GUARDM4090

15、182 SPEAKERT9206438A WIRE ASSYR0150630 HOLDERRA02132A0 HIMERON TAPERA0438700 RUBBERRA02668BA CHASSISRA1110700 REAR PANEL ASSY (W/ COIL SPRING, RELEASE KNOB)RA0540400 RELEASE KNOBRA0022900 COIL SPRINGT9101536 CT CABLERA05

16、39800 SUB PANELCS1804001 CASE (W/ NYLON NET)RA0322600 RUBBER SHEETT9207482 WIRE ASSYRA0415200 (x2 pcs) GROUND PLATEP1090547 CONNECTOR (Ver: EXP, AUS)S5000236 WASHER (Ver: EXP, AUS)P1091107 CONNECTORT9207057 WIRE ASSY????

17、 ?? ?? ????? ? ? ? ?? ? ?? ??????????? ???????????? ??* *Non-designated parts are available onlyas part of a designated assembly.MAIN UNITSUPPLIED ACCESSORIESVXSTD P/N DESCRIPTIONQ0000081 FUSE 15A (x2 pcs)AAA43X001 MIC M

18、H-48A6JT9021715 DC CABLER8139500A LABELR8139500A LABEL SCREW LISTNo. VXSTD P/N DESCRIPTION QTY.? U31208007 OVAL HEAD SCREW M2.6X8B 8? U44308002 TAPTITE SCREW M3X8NI 17? U03310002 SEMS SCREW ASM3X10NI 4? U20308002 BINDING