TM8100 Mobile Radio Service Manual Servicing of Main Board 169
May 2004 © Tait Electronics Limited
8.3 Replacement of Faulty Main-board Assembly
Replace Assembly A faulty main-board assembly requires replacement in any of these
situations:
■ only level-1 repairs permitted
■ fault on board not located
■ repair of fault failed
■ required repair is level-3 repair
If not already done, remove the faulty main-board assembly from the
chassis as described in Subsection 6.3 (on page 137). Obtain a
replacement assembly. The product codes for spare main-board
assemblies are listed in Table 4.4 of Subsection 4.2 (on page 84). Install
the replacement assembly in the chassis as described in Subsection 6.4
(on page 144).
Calibrate and
Program Radio
Connect the radio to the test equipment. Calibrate and program the
replacement main-board assembly in the same way as the faulty assembly.
Use the files downloaded as described in Tasks 2 and 4 of Subsection 5.2
(on page 109). If a file could not be downloaded, use the default file.
Test Main-board
Assembly
Carry out the basic tests given in Subsection 5.2 to confirm that the
replacement main-board assembly functions as required. If there is no
fault, re-assemble the radio as described in Subsection 6.4 and
Subsection 6.5 (on page 148), and conclude with the task discussed
below. If the tests do not confirm the proper functioning of the radio,
the repair failed; remove the spare assembly, re-assemble the radio with
the original assembly, and return to Subsection 5.2.
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