Vertex Standard VXA-200, Service Manual

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1
Air Band Transceiver
VXA-220
Service Manual
Introduction
This manual provides technical information necessary for servicing the
VXA-
220
Air Band 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 damage that may occur as a result of typo-
graphical or other errors that may be present. Your cooperation in pointing
out any inconsistencies in the technical information would be appreciated.
© 2006 VERTEX STANDARD CO., LTD. (EC072N90A)
Contents
Specifications ............................................................................................................................................................... 2
Exploded View & Miscellaneous Parts .................................................................................................................. 3
Block Diagram ............................................................................................................................................................. 5
Circuit Description ..................................................................................................................................................... 7
Alignment ..................................................................................................................................................................... 9
MAIN Unit Circuit Diagram .................................................................................................................................. 13
MAIN Unit Parts Layout ......................................................................................................................................... 15
MAIN Unit Parts List ............................................................................................................................................... 17
Important Note
This transceiver was assembled using Pb (lead) free solder, based on the RoHS specification.
Only lead-free solder (Alloy Composition: Sn-3.0Ag-0.5Cu) should be used for repairs performed on this
apparatus. The solder stated above utilizes the alloy composition required for compliance with the lead-free
specification, and any solder with the above alloy composition may be used.
VERTEX STANDARD CO., LTD.
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VERTEX STANDARD
US Headquarters
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(
AUSTRALIA
)
PTY., LTD.
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