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6-5
Troubleshooting
6-1-5 Abnormal Key tone
Abnormal Keytone
CLK Waveform output
from U204 pin 17?
‘Low’ level on U101 pin 6L?
CLK waveform applied
to CON102-24 pin 24?
Is the buzzer
connection correct?
Connect the buzzer correcty
Check Q201,Q202,R227,R220,D206,
and D207.Replace if required.
Check U101, pin 6.
Replace if required.
Check U204 pin 17.
Replace if required.
Check the buzzer and
replace if required
Yes
Yes
Yes
Yes
No
No
No
No