Nokia 8208 Service Manual page 155

RM-384
System Module and User Interface
AV Connector
The AV Connector consists of single ended mono or stereo audio output and mono audio input.
Figure 78 Headset jack port
The mobile terminal supports Nokia standard 2.5mm mono headset. The headset insertion to the mobile
terminal is detected through pin 4 (HEADSET_DET_N) of the headset Jack, . HEADSET_DET_N ("HEADSET_DET_N" pin
in schematic) is high when headset not inserted. It becomes low when headset is inserted.
Figure 79 Headset detection circuitry
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