Nokia RM-42 Service Manual page 200

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BB Troubleshooting and Manual Tuning Guide

If a special low-pass filter designed for measuring digital amplifiers is unavailable, the measurement must be

performed with a current probe and the input signal frequency must be 2kHz.

Figure 54 Differential output waveform of the Ext_in_IHF_out out loop measurement when speaker is connected.

Figure 55 Single-ended output waveform of the HP_in_Ext_out loop when microphone is connected.

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