Yaesu FT-897 Technical Supplement

HF/VHF/UHF
ALL MODE Transceiver
FT-897/-897D
Technical Supplement
©2010 VERTEX STANDARD CO., LTD.
Introduction
This manual provides technical information necessary for servicing the FT-897/D 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, 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
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.
Specifications ................................................... 2
Exploded View & Miscellaneous Parts ....... 4
Block Diagram .................................................. 5
Circuit Description ......................................... 7
Alignment ....................................................... 10
EH012M90D
Contents
Board Unit
MAIN Unit ............................................................... 23
PLL Unit .................................................................... 69
PA Unit ...................................................................... 89
PANEL Unit ........................................................... 117
MIC Unit ................................................................. 137
VR Unit ................................................................... 140
BATT-CONN Unit ................................................. 141
REF Unit .................................................................. 142
TCXO-9 Unit .......................................................... 143
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 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
VERTEX STANDARD ( AUSTRALIA ) PTY., LTD.
Normanby Business Park, Unit 14/45 Normanby Road
Notting Hill 3168, Victoria, Australia
(Schematics, Layouts & Parts)
1