Motorola Moto X Pure Edition Troubleshooting Manuals page 62

Quaternary Microphone
If the Quaternary MIC is not functioning ...
- Check MIC bias at C4530 or C4534 or C4533. This should be 1.7~1.8V when the microphone is
enabled.
- Check the 4 th microphone sealing grommet on the 4
assemble abnormally, the MIC hole could be blocked while it has been assembled.
- Check the microphone output at C4531 or C4532. The AC amplitude should increase (Output DC
bias should be around 0.7V), when audio is present.
MOTOROLA CONFIDENTIAL
th MIC part. If the grommet has been
Moto X Pure Edition/Moto X Style
Baseband TROUBLESHOOTING GUIDES