User Guide

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SGH-E100 Flow Chart of Troubleshooting
7-11
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6. Speaker Part(Melody)
U403 pin 5 = 2.85V?
Speaker does not work
Check the Clock signal
at Pin 1 of U402
(13MHz)
Check the clock generation circuit
(related to U101 and U403)
END
No
Yes
No
Resolder or replace U403
U402 pin 17,18 ≒ 1.8V?
(When U301 operate)
Resolder U402
Yes
No
CN100 pin 20,21
≒ 1.8V?
Check the circuit related to
"SPK_P/SPK_N" signal
Yes
No
Is Speaker working?
No
Yes
Change the Speaker
Yes
Yes