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4. TROUBLE SHOOTING
4.14 Earphone Trouble
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Earphone Detecting Operation
• The DBB read JACK_DETECT port periodically and if the voltage of "JACK_DETECT" goes to 0V, it
detects ear-jack inserted.
• The ABB operates A/D conversion continuously and if the voltage of "HOOK_DETECT" node goes to
about 40mV, it detects hook switch is pushed in call state.
Earphone Sending Path
• HSMICP is the audio signal from the microphone of the earphone.
• R225, R224 and C240 make the path of the audio signal from the microphone of the earphone.
• This audio signal is delivered to ABB(IOTA).
Earphone Receiving Path
• HSO is the audio signal from ABB(IOTA).
• R227,L201and C241 make the path of the audio signal from ABB to earphone.
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EAR_JACK SPEC
MIC
Receiver
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