Microphone Failure - Nokia 2228Arte Service Manual

RM-377
BB Troubleshooting and Manual Tuning Guide

Microphone Failure

a. Check echo loop function by #190# test mode.
b. Change a new component to confirm MIC failure or not.
c. Check MIC_BAS has 2V output when system in echo mode.
d. Check connections or solder connections on R609, R610, R611, C610 and C612.
c. Check QSC6030 to check main chip issue.
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