Check Microphone Using "Hp Microphone In Ext Speaker Out" Loop; Check Earpiece Using "Ext Microphone In Hp Speaker Out" Loop - Nokia RH-99 Service Manual

RH-99; RH-100; RH-105; RH-106
Baseband troubleshooting
Figure 22 PWB audio test points

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

Steps
1. Connect phone with Phoenix.
Figure Phoenix audio test window
2. Open "audio test" window from "Testing -> Audio test", as shown in
above.
3. Select "Hp microphone in Ext speaker out"
4. Select "Loop" as "On"
5. Input sound at microphone port, for example 94dB SPL 1kHz.
Figure PWB audio test points above.
6. Check if signal is detected at XEarL/R pads, shown in
Figure 23 Test arrangement for microphone

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

Steps
1. Connect phone with Phoenix.
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