Nokia n81 Service Manual page 93

RM-179; RM-223
Baseband Troubleshooting
Figure 24 Single-ended output waveform of the Ext_in_HP_out measurement when earpiece is connected.
Integrated handsfree signal
Figure 25 Differential output waveform of the Ext_in_IHF_out out loop measurement when speaker is connected.
External output from AV
Figure 26 Single-ended output waveform of the Ext_in_Ext_out loop.
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