Samsung GT-S3370 Service Manual page 36

Flow Chart of Troubleshooting
9-1-4. Microphone Part (SPK phone)
Check the reference voltage on mic path
Yes
Is the assembled status of
microphone O.K?
Yes
Yes
On booting,
HSED_BIAS(L501) ≒ 1.8V ?
Yes
On booting,
voltage between
MIC1+(C515) and MIC1-(C514)
≒ 0.8V?
Yes
On calling,
MIC_SEL(U500 pin4&8) are
≒ 1.8V ?
Yes
On calling,
MIC+(C502) & MIC-(C507)
≒ 1.0V?
Yes
END
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No
Reassemble the microphone
No
Check UCP300
No
Change MIC_500
No
Check UCP300
No
Check UCP300
9-8