Motorola EVX S24, Service Manual, Page: 3 / 74

Chapter 1
Introduction
This manual provides the technical information necessary for servicing the EVX-S24 UHF Digital/
Analog Transceiver.
Servicing this equipment requires expertise in handing 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 board in this transceiver. Each side of
the board is referred to by the type of the majority of components installed on that side (“Side A” or
“Side B”). In most cases one side has only chip components (surface-mount devices), and the other
has either a mixture of both chip and leaded components (trimmers, coils, electrolytic capacitors, ICs,
etc.), or leaded components only.
As described in the pages to follow, the advanced microprocessor design of the EVX-S24 Transceiver
allows a complete alignment of this transceiver to be performed without opening the case of the radio;
all adjustments can be performed from the front panel, using the “Alignment Mode” menu.
While we believe the 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.
NOTICE: 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.
MN006437A01-AB
Introduction
3