Check Microphone Using "Hp Microphone In Ext Speaker Out" Loop - Nokia RH-64 Service Manual

RH-64
Nokia Customer Care Baseband troubleshooting
Figure 94 PWB audio test points

Check microphone using "Hp microphone in Ext speaker out" loop

Steps
1. Connect phone with Phoenix.
2. Open "audio test" window from "Testing -> Audio test", as shown in Figure Phoenix audio test window above.
3. Select "Hp microphone in Ext speaker out"
4. Select "Loop" as "On"
5. Input sound at microphone port, for example 94 dB SPL 1 kHz.
6. Check if signal is detected at XEARP/N pads, shown in Figure PWB audio test points above.
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