Vertex Standard VX-2500U, Service Manual

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1
UHF FM Transceiver
VX-2500U
Service Manual
Introduction
This manual provides technical information necessary for servicing the VX-2500U Transceiver.
Servicing this equipment requires expertise in handling surface-mount chip components. 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 circuit board in the transceiver. Each side of thr board is
referred to by the type of the majority of components installed on that side (“leaded” or “chip-only”). In most cases one
side has only chip 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 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 information would be appreciated.
Specifications ..................................................... 2
DSUB 9-pin Accessory Connector .................. 3
Exploded View & Miscellaneous Parts ......... 4
Block Diagram .................................................... 5
Interconnection Diagram ................................. 9
Circuit Description .......................................... 11
Contents
Alignment ...................................................... 13
RF Unit Jumper Information ...................... 23
Clone ............................................................... 24
Board Unit (Schematics, Layouts & Parts)
RF Unit .......................................................................... 25
RF-1- Unit ...................................................................... 43
RF-2- Unit ...................................................................... 57
Panel Unit ..................................................................... 69
© 2004 VERTEX STANDARD CO., LTD.
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.
YAESU EUROPE B.V.
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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