Nokia RM-555 Service Manual page 136

External output from AV (acoustic input)
Page 3 –78
Figure 50 Single-ended output waveform of the AV Mic to AV Ear loop.
Figure 51 Single-ended output waveform of the HP Mic to AV Ear loop.
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BB Troubleshooting and Manual Tuning Guide
RM-555
Issue 1