Yaesu VX-7R Service Manual

1

Specification .................................................................................................................................... 2

Exploded View & Miscellaneous Parts........................................................................................ 4

Block Diagram ................................................................................................................................. 5

Interconnection Diagram ............................................................................................................... 6

Circuit  Description ........................................................................................................................ 7

Alignment ...................................................................................................................................... 11

Board Unit (Schematics, Layouts & Parts)

RF Unit ....................................................................................................................................................................19

AF Unit ....................................................................................................................................................................33

CNTL Unit ..............................................................................................................................................................43

VCO Unit ................................................................................................................................................................53

©2002 VERTEX STANDARD CO., LTD.  Printed in Japan.

Technical Supplement

VX-7R

50/144/430 MHz Triple-Band

Heavy Duty Submersible Transceiver

Introduction

This manual provides the technical information necessary for servicing

the VX-7R 50/144/430 MHzTriple-Band Heavy Duty Submersible Trans-

ceiver.

Servicing this equipment requires expertise in handing surface-mount

chip components. Attempts by non-qualified persons to service this

equipment may result in permanent damage not covered by the war-

ranty, and may be illegal in some countries.

Two PCB layout diagrams provided for each double-sided board in

this transceiver. Each side of the board is referred to by the type of the

majority of components installed on that side ("Side A" or "Side B"). In

most cases one side has only chip components, and the other has either

a mixture of both chip and leaded components (trimmers, coils, electro-

lytic capacitors, ICs, etc.), or leaded components only.

While we believe the information in this manual to be correct, VER-

TEX STANDARD assumes no liability for damage that may occur as a

result of typographical or other errors that may be present. Your coop-

eration in pointing out any inconsistencies in the technical information

would be appreciated.

Contents

DW

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

EH009M90A