User Guide

5-11 Flow chart of Troubleshooting and Circuit Diagram
5-6 Speaker Part
Speaker does not work
Ye s
Check for the clock signal at R608
Check the clock generation circuit
(related to U502 and U601)
and resolder R608
U301 pin 17,18 =1.8V?
No
No
Resolder U301
Ye s
Ye s
Replace the PBAU230 pin 4,8="H"?
CN200 PIN 18,20=1.8V? Resolder U230
No
Ye s
Ye s
No
Check the SPK pins
No
Modify the SPK pins
Is Speaker working?
Ye s
Change the Speaker
No
Ye s
END