6-17
12. Checking the audio circuit
Is a cable with the host PC connected?
Aren't the setups of the host PC a minimum and off?
Failure point
Audio cable disconnection.
Failure point
The setup of the host PC is changed.
Is correct output waveform being inputted from JK011 pin 2, 3 of the host PC?
Failure point
Audio cable disconnection.
Is the waveform which is the same as JK011 being inputted to I001 pin 4, 9?
Failure point
1) Printed wire broke between JK011 pin 2, 3 and I001 pin 4, 9.
2) R040, R041 open.
3) R042, R043 short.
4
en.
Is output waveform being outputted in I001 pin 14, 17?
Is 15V supplied to I001 pin 15, 16?
Proceed section 9.1 "No power on (1)".
OK
OK
OK
OK
OK
OK
NG
NG
NG
NG
NG
NG
Failure point
1) Speaker cable disconnection.
2) Speaker failure.
Is mute/STD-BY low level at pin 11, pin 12.
Proceed section 11. "Checking the
operation of CPU".
OK
NG
Is Variable DC volume control at pin 6.
OK
NG
Proceed section 11. "Checking the
operation of CPU".
Failure point
I001 failure
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