Check Earpiece Using "Ext Microphone In Hp Speaker Out" Loop; Check Ihf & Ringing Tone Function Using "Buzzer - Nokia RM-291 Service Manual

Nokia Customer Care

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

Steps
1. Connect phone with Phoenix.
2. Open "audio test" window from "Testing -> Audio test", as shown in
above.
3. Select "Ext microphone in Hp speaker out"
4. Select "Loop" as "On"
5. Input signal to XMICP/N pads, as shown in
kHz.
6. Check if sound is heard in earpiece.
Troubleshooting flow
Check IHF & ringing tone function using "Buzzer"
Steps
1. Connect phone with Phoenix.
2. Open "audio test" window from "Testing -> Audio test", as shown in
above.
3. In "Buzzer" area, select suitable signal to be played, for example 1 kHz, Strength 5"
4. Select "Volume" as "On"
5. Check if sound is heard in IHF.
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Figure PWB audio test points above, for example 100 mVpp, 1
Figure 87 Test arrangement for earpiece
Figure 88 Checking IHF and ring tone by using "Buzzer"
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Baseband troubleshooting
Figure Phoenix audio test window
Figure Phoenix audio test window
RM-291
Issue 1