Yaesu VX-2R, Technical Supplement

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1
©
2003 VERTEX STANDARD CO., LTD. EH015M90A
Technical Supplement
Specifications .................................................................................................................................................................. 2
Exploded View & Miscellaneous Parts
...................................................................................................................... 4
Connection Diagram ...................................................................................................................................................... 5
Block Diagram ................................................................................................................................................................ 6
Circuit Description......................................................................................................................................................... 7
Alignment ...................................................................................................................................................................... 11
Board Units (Schematics, Layouts & Parts)
MAIN Unit................................................................................................................................................................ 17
FILTER Unit.............................................................................................................................................................. 33
SW Unit ..................................................................................................................................................................... 37
VCO Unit .................................................................................................................................................................. 39
Introduction
This manual provides the technical information necessary for servicing the
VX-2R
VHF/UHF Ultra-Compact Dual-Band Transceiver with Wide Band Coverage.
Servicing this equipment requires expertise in handing surface-mount chip com-
ponents. Attempts by non-qualified persons 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 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 only
chip components (surface-mount devices), and the other has either a mixture of
both chip and leaded components (trimmers, coils, electrolytic capacitors, ICs,
etc.), or leaded components only.
As described in the pages to follow, the advanced microprocessor design of the
VX-2R
allows a complete alignment of this transceiver to be performed without
opening the case of the radio; all adjustments can be performed from the front
panel, using the “Alignment Mode” menu.
While we believe the information in this manual to be correct, VERTEX STAN-
DARD assumes no liability for damage that may occur as a result of typographical
or other errors that may be present. Your cooperation in pointing out any incon-
sistencies in the technical information would be appreciated.
Contents
VERTEX STANDARD CO., LTD.
4-8-8 Nakameguro, Meguro-Ku, Tokyo 153-8644, Japan
VERTEX STANDARD
US Headquarters
10900 Walker Street, Cypress, CA 90630, U.S.A.
International Division
8350 N.W. 52nd Terrace, Suite 201, Miami, FL 33166, U.S.A.
YAESU EUROPE B.V.
P.O. Box 75525, 1118 ZN Schiphol, The Netherlands
YAESU UK LTD.
Unit 12, Sun Valley Business Park, Winnall Close
Winchester, Hampshire, SO23 0LB, U.K.
VERTEX STANDARD HK LTD.
Unit 5, 20/F., Seaview Centre, 139-141 Hoi Bun Road,
Kwun Tong, Kowloon, Hong Kong
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