EVX-531 UHF Service Manual 1
UHF Digital/Analog Transceiver
EVX-531
Service Manual
Vertex Standard LMR, Inc.
©
2013 Vertex Standard LMR, Inc.
EC113U90F
Introduction
This manual provides technical information necessary for servicing the
EVX-531 UHF Hand-Held Digital/Analog Transceiver.
Servicing this equipment requires expertise in handling surface-mount
chip components. Attempts by non-qualied persons to service this equip-
ment 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 ma-
jority 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 in-
formation would be appreciated.
Important Note
This transceiver is assembled using Pb (lead) free solder, based on
the RoHS specication.
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 specication, and any solder with the above al-
loy composition may be used.
CAUTION
Risk of explosion if battery is replaced by an incorrect type.
Dispose of used batteries according to the instructions.
Contents
Specications
USA/EXP Models ......................................................................................................................................... 2
EU Model ...................................................................................................................................................... 3
Exploded View & Miscellaneous Parts
w/o Option Connector ................................................................................................................................... 4
w/ Option Connector ..................................................................................................................................... 5
Parts List ............................................................................................................................................................ 6
Block Diagram ................................................................................................................................................... 8
Circuit Description ........................................................................................................................................... 9
Alignment..........................................................................................................................................................11
MAIN Uuit Circuit Diagram
(
Type “G6”, w/o Option Connector
)
........................................................... 22
MAIN-2 Uuit Circuit Diagram
(
Type “G7”, w/o Option Connector
)
........................................................ 25
MAIN-3 Uuit Circuit Diagram
(
Type “G6” & “G7”, w/ Option Connector
)
............................................ 28
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