Yaesu FT-897 Technical Supplement

Introduction

This manual provides technical information necessary for servicing the FT-897 HF/VHF/UHF ALL MODE Trans-

ceiver.

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 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, electrolyt-

ic 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 damage 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.

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

Technical Supplement

FT-897

HF/VHF/UHF

ALL MODE Transceiver

Specifications................................................... 2

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

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

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

Alignment....................................................... 10

Contents

Board Unit

 (Schematics, Layouts & Parts)

MAIN Unit ............................................................... 21

     PLL Unit ................................................................... 53

     PA Unit ..................................................................... 59

     PANEL Unit ............................................................. 73

     MIC Unit .................................................................. 81

     VR Unit ..................................................................... 82

     BATT-CONN Unit .................................................. 83

     REF Unit ................................................................... 84

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