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4 pin 3.5mm (2.5mm) plug connector layout
4 pin 3.5mm (2.5mm) plug connector
at the headset cable
original headset marked HDW-12420-001
The pinout should fit 35 devices/models. Click to list>
Pin Pin
Name		 Description
1 control +2.4v
2 Audio channel left or right
3 Audio channel left or right
4 Ground Ground

Ring 1 has a 1.4K ohm loading to Ground. When talk/play/pause function button is pushed it applies a short across ring 1 and 4. With ring 1 disconnected the Pearl plays via its internal speaker. However with 1 and 4 shorted it continues to play from its internal speaker!
 


 

 
Pinout status: +5 -0
According to 6 reports in our database (5 positive and 0 negative) the Blackberry 7105t, 7100i, 7100g, 7130g, 7130c, 7130e, 7250, 7290, 7520, Blackberry Pearl 8100, Blackberry 8800, 8820, 8830, 8350i, 8700c, 8700g, 8703e, 8705g audio pinout should be correct.

Is this pinout
NO DIY devices
Blackberry 7105t, 7100i, 7100g, 7130g, 7130c, 7130e, 7250, 7290, 7520, Blackberry Pearl 8100, Blackberry 8800, 8820, 8830, 8350i, 8700c, 8700g, 8703e, 8705g audio visual pinout:click to enlarge
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