TM8100 Mobile Radio Service Manual Servicing Procedure 109
May 2004 © Tait Electronics Limited
5.2 Fault Diagnosis and Repair
List of Tasks When the radio is reported to have a functional fault, carry out the tasks
described in this section. There are seven possible tasks in all:
■ Task 1 — power up radio
■ Task 2 — read programming file
■ Task 3 — obtain SFE (software feature enabler) details
■ Task 4 — read calibration file
■ Task 5 — check user interface
■ Task 6 — check receive and receive-audio functions
■ Task 7 — check transmit and transmit-audio functions
Only the task relevant to the reported fault needs to be carried out,
except that the first four tasks must always be done. If the report of the
fault is not sufficiently specific, all the tasks must be done. If the fault is
not
confirmed when the relevant task is done, obtain more information
from the Customer; in particular, determine whether the radio is
properly configured for the Customer’s system.
Tas k 1 —
Power up Radio
With the radio connected to the test equipment as described in
Subsection 4.5 (on page 93), attempt to power up the radio:
1. Apply power to the radio. If the radio doesn’t power up
automatically, press the
ON/OFF switch.
2. If the radio powers up successfully, proceed to Task 2. If it does
not, attempt to rectify the fault as described in the chart of
Figure 5.1.
3. If the repair succeeded — without the need for replacing the
main-board assembly — proceed to Task 2. Otherwise continue
with Step 4.
4. If the main-board assembly was replaced or if the repair failed, re-
assemble the radio as described in Subsection 6.4 (on page 144)
and Subsection 6.5 (on page 148). Conclude with the tasks of
Subsection 5.3 (on page 121).
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