Check Speaker Outputs - Tait TM9100 Service Manual

If the inputs to the audio PA are not faulty, check the speaker outputs from
Task 5 —
Check Speaker
the PA.
Outputs
1.
2.
3.
4.
5.
6.
7.
8.
TM9100 Service Manual
© Tait Electronics Limited August 2005
Check the positive and negative speaker outputs
– at pins 3 and 8 respectively of IC202 (see
ITF SPK
pin 3 of IC202 (AUD ITF SPK+): approximately half-rail bias
pin 8 of IC202 (AUD ITF SPK–): approximately half-rail bias
If the speaker outputs are correct, go to
Step 3.
Check for and repair any soldering faults around IC202
(see Figure 13.2), or else replace IC202.
Confirm the removal of the fault and go to
page 147. If the repair failed, replace the main-board assembly and go
to "Final Tasks" on page
With the volume at maximum, check each speaker output at pins 3
and 8 of IC202 (see Figure
pin 3 of IC202 (AUD ITF SPK+): approximately 9.5V
pin 8 of IC202 (AUD ITF SPK–): approximately 9.5V
If the speaker outputs are correct, the fault is unknown (it could be
intermittent); replace the main-board assembly and go to
Tasks" on page 147. If there is no AC, go to
Check that C204 and R214 (see
correctly soldered. Repair any fault.
Confirm the removal of the fault and go to
page 147. If the repair failed or the fault could not be found, replace
the main-board assembly and go to
AUD ITF SPK
Step 5. If they are not, go to
"Final Tasks" on
147.
13.2):
AC
pp
AC
pp
Step
Figure 13.2) are not faulty and are
"Final Tasks" on
"Final Tasks" on page
CODEC and Audio Fault Finding
+ and
AUD
Figure 13.2):
"Final
7.
147.
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