Tait TM8000 Series, Руководство по обслуживанию

Страница: 155 / 244

TM8100 Mobile Radio Service Manual Servicing of Control Head 155
May 2004 © Tait Electronics Limited
Task 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 .
Task 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 .