Check Qn Test Point - Tait TM9100 Service Manual

If the level shifter is not faulty, check the signal at the
Task 11 —
Check Test Point
QN
ascertain whether the digital board, CODEC 1, or the receiver is at fault.
1.
2.
3.
4.
5.
TM9100 Service Manual
© Tait Electronics Limited August 2005
Use the programming application to find the frequency selected for
channel 1.
Apply a strong on-channel signal.
Check that a sine wave is present at the
through a hole in the
IF TOP
QN test point: sine wave
If there is a sine wave present, go to
"Receiver Fault Finding" on page
Either the digital board or CODEC 1 (IC204) is faulty; replace the
main-board assembly and go to
test point. This will
QN
test point (there is access
QN
can — see Figure 13.8).
Step 5. If there is not, go to
227.
"Final Tasks" on page
CODEC and Audio Fault Finding
147.
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