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Only for training and service purposes
4. TROUBLE SHOOTING
z MIC Trouble
YES
NO
Voltage across TP1
is about 2.5V?
change the Main Board
Check the signal
level TP2,TP3 Is it
a few tens mVAC?
START
Replace U100
Replace MIC600
NO
YES
Replace U100
NO
Check the soldering of
TP2,TP3,TP4,TP5
END
z MIC signal flow
- MIC is enable by MICBIAS
- MICBIAS Signal from ABB(U100).
- MICIN, MICIP signal from MIC(MIC600)
z Check Point
-MIC bias
- Audio Signal level of the Microphone
- Soldering of Components
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