Vertex Standard VX-241PMR446 Service Manual

UHF FM PMR446 Radio
VX-241PMR446
( VX-241-G3-1 )
Service Manual
Introduction
This manual provides technical information necessary for servicing the
VX-241PMR446 UHF FM PMR446 radio.
Servicing this equipment requires expertise in handling surface-mount chip com-
ponents. 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 com-
ponents (trimmers, coils, electrolytic capacitors, ICs, etc.), or leaded components
only.
While we believe the technical 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 cooperation in pointing out any inconsistencies in the technical information
would be appreciated.
This transceiver is 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.
Specifications ........................................................................................................................ 2
Exploded View & Miscellaneous Parts .............................................................................. 3
Parts List ............................................................................................................................... 4
Block Diagram ...................................................................................................................... 5
Circuit Description .............................................................................................................. 6
Alignment.............................................................................................................................. 8
MAIN Uuit Circuit Diagram ............................................................................................. 14
MAIN Unit Parts Layout ................................................................................................... 15
VX-241PMR446 Service Manual
Important Note
Contents
Vertex Standard LMR, Inc.
© 2014 Vertex Standard LMR, Inc.
EC112U90C
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