Motorola V8162, Service Manual

Page: 55 / 93

55 © 2000 Motorola, Inc.
TROUBLESHOOTING
V8160 Cellular Subscriber Sector
Troubleshooting
Introduction
Known good replacement parts and assem-blies
should be available to be used for trou-
bleshooting by substitution, and for replacement
of defective parts/assemblies. Defective circuit
boards should be forwarded to the appropriate
Motorola service facility for repair. Refer to the
“Replacement Parts” section of this manual for a
list of replacement part descriptions and part
numbers.
Troubleshooting and Repair
The troubleshooting chart in Table 7, “Assembly
Replacement Level Trouble-shooting and Repair
Chart,” on page 56 shows some typical malfunc-
tion symptoms and the corresponding verifica-
tion and repair procedures. Refer to the
disassembly instructions located in the “Disas-
sembly” 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 recieve audio quality is normally sufficient.
When the Logic/RF assembly is replaced, the
unit must have a comprehensive test on a GSM/
DCS 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.
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.