Vertex Standard VXA-300 Pilot III, Service Manual

Page: 1 / 32

1
Air Band Transceiver
VXA-300
Service Manual
Introduction
This manual provides technical information necessary for
servicing the
VXA-300 Air Band Transceiver.
Servicing this equipment requires expertise in handling sur-
face-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 (trim-
mers, coils, electrolytic capacitors, ICs, etc.), or leaded com-
ponents 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.
© 2004 VERTEX STANDARD CO., LTD. (EC057N90A)
Contents
Specifications ............................................................................................................................................................... 2
Exploded View & Miscellaneous Parts .................................................................................................................. 3
Block Diagram ............................................................................................................................................................. 5
Circuit Description ..................................................................................................................................................... 7
Alignment ................................................................................................................................................................... 11
MAIN Unit Circuit Diagram ................................................................................................................................... 15
MAIN Unit Parts Layout .......................................................................................................................................... 17
MAIN Unit Parts List ............................................................................................................................................... 19
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.
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