Analogue wired Headset Nokia

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(Applied some suggestions from joerg)
(Reformatted explanation of the rework.)
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[http://europe.nokia.com/HS-40 Nokia webpage] ([http://lists.openmoko.org/pipermail/community/2008-September/029633.html Mailing list announce]).
 
[http://europe.nokia.com/HS-40 Nokia webpage] ([http://lists.openmoko.org/pipermail/community/2008-September/029633.html Mailing list announce]).
  
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To reach the PCB you have to remove the bottom black piece of the gray case. It is glued with a soft adhesive, so simply pull out with a fingernail. Below this you can find one of the two screws.  
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To reach the PCB you have to remove the bottom black piece of the gray case. It is glued with a soft adhesive, so simply pull out with a fingernail. Below this you can find one of the two screws. The upper black piece is now unlocked, and you only have to remove it to see the second screw. Now you have opened the case. Remember where the knots of the cables are, and pull out the PCB. You have to swap the red and white wires as seen in the picture (click on the image for full size).
  
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[[Image:NokiaHS40_disassemble1.jpg]]
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[[Image:NokiaHS40_disassemble1.jpg|120px]]
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[[Image:NokiaHS40_disassemble2.jpg|150px]]
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The upper black piece is now unlocked, and you only have to remove it to see the second screw.
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[[Image:NokiaHS40_disassemble3.jpg|180px]]
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[[Image:NokiaHS40_modification.jpg|180px]]
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[[Image:NokiaHS40_disassemble2.jpg]]
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Now you have opened the case. Remember where the knots of the cables are, and pull out the PCB.
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[[Image:NokiaHS40_disassemble3.jpg]]
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This is a closer view of the PCB. You have to swap the red and white wires as seen in the picture.
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[[Image:NokiaHS40_modification.jpg]]
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You have to change the gain of the output in alsamixer from 80% to 95% due to different sensitivity (dBm/mW) of headphone speakers. Microphone works perfectly. Button may work (not tested).
 
You have to change the gain of the output in alsamixer from 80% to 95% due to different sensitivity (dBm/mW) of headphone speakers. Microphone works perfectly. Button may work (not tested).

Revision as of 01:22, 8 September 2008

The pinout of Nokia Phones is known to use the Nokia-wired-conectivity standard?, which is:

  • Tip: left speaker/stereo or main speaker/mono
  • 2: microphone and button (low resistance to ground on press)
  • 3: right speaker/stereo or not connected/mono
  • Base: ground

This pinout is not compatible to Neo. To use Nokia headphones you have to rewire them swapping Tip and 3.

The following sections describe the modifications made to diferent models of headsets by its owners.

HS-40

Nokia webpage (Mailing list announce).

To reach the PCB you have to remove the bottom black piece of the gray case. It is glued with a soft adhesive, so simply pull out with a fingernail. Below this you can find one of the two screws. The upper black piece is now unlocked, and you only have to remove it to see the second screw. Now you have opened the case. Remember where the knots of the cables are, and pull out the PCB. You have to swap the red and white wires as seen in the picture (click on the image for full size).

NokiaHS40 disassemble1.jpg NokiaHS40 disassemble2.jpg NokiaHS40 disassemble3.jpg NokiaHS40 modification.jpg

You have to change the gain of the output in alsamixer from 80% to 95% due to different sensitivity (dBm/mW) of headphone speakers. Microphone works perfectly. Button may work (not tested).

Retrieved from "http://openmoko.org/index.php?title=Analogue_wired_Headset_Nokia&oldid=52638"
Personal tools

The pinout of Nokia Phones is known to use the Nokia-wired-conectivity standard?, which is:

  • Tip: left speaker/stereo or main speaker/mono
  • 2: microphone and button (low resistance to ground on press)
  • 3: right speaker/stereo or not connected/mono
  • Base: ground

This pinout is not compatible to Neo. To use Nokia headphones you have to rewire them swapping Tip and 3.

The following sections describe the modifications made to diferent models of headsets by its owners.

HS-40

Nokia webpage (Mailing list announce).

To reach the PCB you have to remove the bottom black piece of the gray case. It is glued with a soft adhesive, so simply pull out with a fingernail. Below this you can find one of the two screws. The upper black piece is now unlocked, and you only have to remove it to see the second screw. Now you have opened the case. Remember where the knots of the cables are, and pull out the PCB. You have to swap the red and white wires as seen in the picture (click on the image for full size).

NokiaHS40 disassemble1.jpg NokiaHS40 disassemble2.jpg NokiaHS40 disassemble3.jpg NokiaHS40 modification.jpg

You have to change the gain of the output in alsamixer from 80% to 95% due to different sensitivity (dBm/mW) of headphone speakers. Microphone works perfectly. Button may work (not tested).