Nokia c2-00 Service Manual page 64

RM-704
BB Troubleshooting and Manual Tuning Guide
4 Select "Loop" as "On".
5 Input sound at microphone port, for example 94dB SPL 1kHz.
6 Check if signal is detected at HS_EAR_L/R pads, as shown in Figure "PWB audio test points" above.
Figure 29 Test arrangement for microphone
Figure 30 Internal microphone troubleshooting flow
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