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Flow Chart of Troubleshooting
10-13
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10-1-6. Speaker Part
Is the connector
HDC401 O.K?
NO
Reconnect HDC401
There is no sound from speaker
YES
The type of sound from the speaker
is Melody, Mp3?
YES
NO
Are there any signal
at the pin # 15, 16 of UCD401?
Are there any signal
at the pin #3,9 of U402?
NO
NO
Pin #2 of UCD401
is Low?
YES
YES
Are there any signal at
L405, L406?
yes
Check & Replace
L402, L403, HDC401
Are there any signal at
R437, R438?
R442 is high?
Check UCP201
NO
NO
The voltage at
L404 >3.7V??
Check & repl ace L404
NO
Check & re place U401
Check UCP201
YES
NO
YES
YES
NO
C453 = 3.3V?
Check Q401
C445 & C446 = 1.8V?
Check U302
Are there any signal
at the pin #5, 6,7 of UCD401?
Check UCP201
The frequency at R433
is 13MHz?
Check U101,
R124, C140
NO
Check and replace
U402 & R427
NO
NO
NO
NO
YES
YES
YES
Replace UCD401
Replace UCD401
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