Service manual

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Flow Chart of Troubleshooting
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10-14
10-1-7. Mp3 Display Part
NO
Replace the Earphone
Are there any signal
at the pin #4,16 of U408?
NO
Check C525, C526
andthepin#1,4ofZD500
There is no MP3 sound from Earphone
YES
YES
Are there any s ignal
at the C444, 445?
NO
The voltage of C435
is 3.3V?
NO
YES
YES
END
Check the U303
Are there any signal
at the pin #4,6 of CN506?
Are there any signal
at the pin #3,15 of U408?
NO
YES
Pin #2 of U408
is Low?
NO
YES
Pin 14 of U408
is 3.3V?
YES
Pin 4 of U407
is High?
NO
YES
Check
U201
Check
U408
Check
U407
END
NO
Check U302
Check
C444, 445
Check the CN506
Check the U201