Motorola T2260, Service Manual

Page: 63 / 121

63 © 2000 Motorola, Inc.
TROUBLESHOOTING
CDMA 800/AMPS-V2260, T2260
CDMA Dual Mode 800-1900-V2267, T2267
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 replace-
ment of defective parts/assemblies. Defec-
tive 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 replace-
ment 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 malfunction symptoms
and the corresponding verification and
repair procedures. 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 espe-
cially 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 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.