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Flow Chart of Troubleshooting
10-
12
10-1-6. Speaker Part
Speaker does not work
Is the terminal of
Speaker OK?
NO
Check SPK400 connection
YES
①
Check the
pin 6of U406 = "HIGH"
Change or resolder
U406
NO
YES
②
Check the circuit
around U407
Change or resolder
R442,R443,R445,R446
R447,R448
C446,C447,C452,C453
L402,L403,L404
NO
YES
③
Check the Pin#3, #10
of U404 = "LOW or
HIGH"
Check
U406
NO
YES
④
Check the Pin #6
of U406 = "3.7V"
Check
C431 or L401
NO
YES
YES
END
Change speaker
NO
Is speaker OK?