Tait TB8100 Service Manual

TB8100 Service Manual Reciter Fault Finding 89
© Tait Electronics Limited September 2006
3.10 Audio
These checks will verify whether the input and output line levels are correct.
Figure 3.6 on page 90 shows the recommended test equipment set-up.
Figure 3.7 on page 91 shows the location of test points on the digital board,
and Figure 3.8 on page 94 shows the location of test points on the system
interface board.
Task 1 —
Check Audio Output
Using Internal Test
Tone
1. Set up the test equipment as shown in Figure 3.6.
2. Run the Service Kit and connect to the reciter. Put the reciter in
Standby mode. Select Diagnose > Reciter > Audio I/O.
3. In the Output area, select Balanced line out or Unbalanced line
out.
Note Terminate the balanced line output into 600Ω. Ensure there is
only a single load when running the test. Don’t use the CTU’s
internal load and an external termination.
4. Click Start Test.
5. View the Audio Output gauge and check that the measured output
level is the same as the level displayed on the gauge.
Note The Level box displays the line sensitivity of the currently selected
channel. The audio output will be set to this level when the test
is started.
6. Click Stop Test. If the levels are correct, go to Task 2
. If they are
incorrect, go to Step 7.
7. Check the test set-up and repeat the test. If the levels are correct, go
to Task 2
. If they are incorrect, recalibrate the line levels using the
Calibration Kit and repeat the test. If the line levels are now correct,
go to Task 2
.
If the line levels are still incorrect, either the digital board or system
interface board is faulty. If the measured output voltage is greater than
the voltage displayed on the gauge, go to Step 8. If the measured out-
put voltage is less than the voltage displayed on the gauge, go to
Step 9.

Tait TB8100 Specifications

General

Brand	Tait
Model	TB8100
Category	Accessories
Language	English