166 Servicing of Main Board TM8100 Mobile Radio Service Manual
May 2004 © Tait Electronics Limited
Action Following
Fault Diagnosis
There are several outcomes following the fault-diagnosis and repair
procedures given in Section 9 (on page 171). If the main board was
successfully repaired, conclude the servicing task as described below. If
the repair failed, if the fault could not be found, or if the repair required
is a level-3 repair, replace the complete main-board assembly as described
in Subsection 8.3 (on page 169).
Test M ai n-boa rd
Assembly
After repairing the main board, confirm the removal of the fault by
carrying out the basic tests given in Subsection 5.2 (on page 109).
Recalibration or reprogramming of the radio, as mentioned above, might
also be necessary. If the tests confirm the removal of the fault, continue
as described in the next paragraph. If they do not, replace the complete
main-board assembly as described in Subsection 8.3.
Re-install Cans
and Retest
Finally, re-install all cans on the main board that have been removed; refer
to Subsection 4.4 (on page 91) for information on can replacement.
Repeat the above basic tests following the re-installation of the cans. The
tests should again confirm the removal of the fault. Re-assemble the
radio body as described in Subsection 6.4 (on page 144). Return to
Subsection 5.2 to continue with the servicing of the radio. If the tests
do not confirm the repair, replace the complete main-board assembly as
described in Subsection 8.3.
8.2 Replacement of Faulty Component
Introduction This subsection gives the procedure for obtaining the correct
replacement for any faulty component on the main board. There are
four steps:
■ identify version of PCB information pack applicable to board
■ identify replacement component in BOM of PCB information pack
■ consult technical notes
■ obtain replacement component
The technical notes will indicate whether there have been any changes
affecting the component in question.
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