61 © 2002 Motorola, Inc.
Product Support Tools T720
Troubleshooting
Introduction
Known good replacement parts and assemblies
should be available to be used for trou-bleshoot-
ing by substitution, and for replacement of defec-
tive parts/assemblies. Defective circuit boards
should be forwarded to the appropriate Motorola
service facility for repair. Refer to the “Replace-
ment Parts” section of this manual for a list of
replacement part descriptions and part numbers.
Troubleshooting and Repair
Refer to the disassembly instructions located in
the “Disassembly” section of this manual for
instructions on removing parts/assemblies.
Testing after Repair
After any repair work has been carried out, the
unit should be thoroughly tested to ensure that it
operates correctly. This is especially important if
the Logic / RF assembly is replaced.
For general repairs which do not include
replacing the Logic/RF assembly, simply placing
a call and checking signal strength, and transmit
and receive audio quality is normally sufficient.
When the Logic/RF assembly is replaced, the
unit must have a comprehensive test on a CDMA
cellular/PCS compatible communications
analyzers. See “Testing” for further details.
Placing a call on air is usually carried out at this
stage to complete the testing procedure.
(Note: The field test guide will also provide you
with additional information and help you in
investigating a problem.
CAUTION
Many of the integrated circuit devices
used in this equipment are vulnerable to
damage from static charges. An ESD-safe
workstation should be used when-ever
a transceiver is opened.
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