Service
TROUBLESHOOTING---SERVICE SHEET
4
Model 89038
21. On the Audio Analyzer.
key
in FREQ 10
kHz.
Key in 53.2 SPCL and 54.184 SPCL
to
tune the Notch Filter
to
10
kHz.
The amplitude display should be
0.01%
or
less.
Hint: The gates
of
46,
47,
Q9, and
QlO
should be
-
15V
and the FETs should be
off.
The
signal at A3TP7
should be less than 100 mVpp.
22. On the Audio Analyzer, key in FREQ 20
kHz.
Key in 53.3 SPCL and 54.46 SPCL to tune the Notch Filter
to
20
kHz.
The amplitude display should be
0.01Yu
or
less.
Hint: See the hint
for
step 21.
8B-38
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