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Flow Chart of Troubleshooting
9-33
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9-1-14 : Abnormal Earset output
No sound in earset mode
C1,C2 pin in U502
Signal on?
B3,C3 pin in U502
is Active?
A1,A2 pin in U502
is Active?
4,5pin in EAR600
is Active?
Check U503 &
neighboring circuit
Check UCP900 &
neighboring circuit
Check U502 &
neighboring circuit
Check EAR600 &
neighboring circuit
Is Earset
OK?
Change Earset
END
NO
YES
YES
NO
YES
NO
YES
NO
YES
NO