Ring 1 has 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. How ever with 1 and 4 shorted it continues to play from its internal speaker.
4 pin 3.5mm (2.5mm) plug connector
at the headset cable


original headset marked HDW-12420-001
PinPin
Name
Description
1control+2.4v
2Audio channelleft or right
3Audio channelleft or right
4GroundGround
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 compatibility:
  • Blackberry 5810
  • Blackberry 5820
  • Blackberry 6230
  • Blackberry 6280
  • Blackberry 6510
  • Blackberry 6710
  • Blackberry 6750
  • Blackberry 7100
  • Blackberry 7105
  • Blackberry 7130c
  • Blackberry 7130e
  • Blackberry 7130g
  • Blackberry 7210
  • Blackberry 7230
  • Blackberry 7250
  • Blackberry 7270
  • Blackberry 7280
  • Blackberry 7290
  • Blackberry 7520
  • Blackberry 7730
  • Blackberry 7750
  • Blackberry 7780
  • BlackBerry 8100 Pearl
  • Blackberry 8700c
  • Blackberry 8700f
  • Blackberry 8700g
  • Blackberry 8700r
  • Blackberry 8700v
  • Blackberry 8703e
  • Blackberry 8705g
  • Blackberry 8800
  • BlackBerry 8820
  • Blackberry 8830
  • Blackberry Blackberry 6210
  • Blackberry Pearl

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