Internal Earpiece Troubleshooting - Nokia 6680 RM-36 Service Manual

RM-36
BB Troubleshooting and Manual Tuning Guide Nokia Customer Care
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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 62 Differential output waveform of the Ext_in_IHF_out out loop measurement when speaker is connected.
Figure 63 Single-ended output waveform of the HP_in_Ext_out loop when microphone is connected.

Internal earpiece troubleshooting

Before you begin
Familiarize yourself with the Audio troubleshooting test instructions (Page 6–50).
Issue 1 Company Confidential Page 6–53
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