TM8100 Mobile Radio Service Manual Servicing of Control Head 155
May 2004 © Tait Electronics Limited
Tas k 3 —
Some but not All Keys
Faulty
If one or more (but not all) of the keys are faulty, repair the control head
as follows:
1. Disconnect the control-head loom and remove the control-head
board as described in Subsection 6.2 (on page 131).
2. Use isopropyl alcohol and a soft lens-cleaning cloth to clean the
pads on the control-head board for those keys that are faulty.
Figure 7.1.
3. Re-install the control-head board as described in Subsection 6.5
(on page 148).
4. Reconnect the control-head loom and test the keys. If the fault
has been removed, return to Subsection 5.2 (on page 109). If it
has not, go to Step 5.
5. Disassemble the control head completely as described in
Subsection 6.2. Replace the keypad with a spare. Obtain the
spare keypad by disassembling the spare control head of Spares kit
1 or 10 as described in Subsection 6.2.
6. Re-assemble the control head as described in Subsection 6.5.
Reconnect the control-head loom, test the keys to confirm the
removal of the fault, and return to Subsection 5.2.
Tas k 4 —
Speaker Faulty
If the speaker functions only intermittently or the audio level is low,
repair the control head as follows:
1. Disconnect the control-head loom and disassemble the control
head completely as described in Subsection 6.2.
2. Replace the speaker with a spare. Obtain a spare speaker by
disassembling the spare control head of Spares kit 1 or 10 as
described in Subsection 6.2.
3. Re-assemble the control head as described in Subsection 6.5.
4. Check the continuity from the speaker connector SK2 to pin 17
(
SPK–) and pin 18 (SPK+) [at 1E1] of the control-head connector
SK1 (see Figure 7.2). If there is no fault, go to Step 5. If there is
still a fault, go to Task 5.
5. Reconnect the control-head loom, test the speaker to confirm the
removal of the fault, and return to Subsection 5.2.
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