436 Fault Finding of Control Head with 1- 2- or 3-Digit Display TM8100/TM8200 Service Manual
© Tait Electronics Limited June 2006
15.7 Speaker Faulty
If the speaker functions only intermittently or the audio level is low:
1. Replace the speaker.
2. Check the continuity from the speaker connector SK2 to pin 17
(
SPK–) and pin 18 (SPK+) of the control-head connector SK1 (see
Figure 15.2). If there is no fault, go to Step 3. If there is still a fault,
go to “Volume Control Faulty”.
3. Reconnect the control-head loom, test the speaker to confirm the
removal of the fault, and return to “Initial Tasks” on page 149.
15.8 Volume Control Faulty
If the volume control works only intermittently, works only at full volume,
or does not work at all:
1. Disconnect the control-head loom.
2. Check that the resistance between pins 1 and 2 of the volume-control
potentiometer RV1 varies linearly between about 0Ω and 10kΩ. (see
Figure 15.2). If it does, go to Step 3. If it does not, go to Step 6.
3. Replace the speaker.
4. Re-assemble the control head. Reconnect the control-head loom.
Confirm the removal of the fault, and return to “Initial Tasks” on
page 149.
5. Remove the control-head board.
6. Replace the potentiometer RV1. See Figure 15.1.
7. Re-assemble the control-head board. Reconnect the control-head
loom. Confirm the removal of the fault, and return to “Initial Tasks”
on page 149.
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