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5-17
Flow Chart of Troubleshooting and Circuit Diagrams
5-10 Melody Part
Melody is not working
Check the circuit containing U104
U301 Pin 7
is H ?
Yes
Yes
Check the R511
Check
U301 Pin 1
Working?
Yes
END
Check the C311, C315, C314
R316, R317, R318
spk + / spk -
working
Change the U301
Yes
Yes
Pin 14 is working
Well
U301
?
Yes
Change the speaker