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Distorted audio and loud noise
Distorted audio and
loud noise
Yes
Check the power supply voltages
+5V to the operation amplifying
Q1 is normal.
Yes
Check whether the muting resistance
R133 is normal
Yes
Check
whether
the
resistance
R132 is normal
Yes
Checking the U927 leads
the feet has no to break to
open
Yes
Check the voltage on pin7
of U927 is OK.
Yes
Check whether the U1 or
U927
power
normal
Yes
Replace U1 or U927
No
No
muting
No
No
No
supply
4-7
Check Q1
No
Replace
R133
Replace
R132
Correct connection
Replace R134
Check U927
Trouble shooting chart
Free Datasheet http://www.datasheet4u.net/
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