Question about Sennheiser PXC 250 Consumer Headphones

2 Answers

Hi team, I have a pair of sennheiser pxc 250 head phones and the wires have broken off the main unit, does any have a picture of the inside pc that show's were the wire's go? many thanks with your help.

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  • humbucker611 Aug 26, 2010

    it's all the wire's that have broken from the main unit, so I would need to see were to replace the wire's.

  • humbucker611 Aug 26, 2010

    the advice was ok but, I need a more help to place the rest of the wire's on the pcb a close up picture would be good showing were all wire's go to the board.

  • humbucker611 Aug 26, 2010

    thanks for getting back so quick, looking at the pcb the jack wires are still there how ever it's the head phone connections that have came away from the pcb. colour's are red/green, red, blue, ground and two long gold wires. on the pcb i can see a red soldered wire next to that is a wire connection missing then green followed by ground wire... next to that is a connection missing then has you move up the pcb there's 3 connections (a) ground and 2 wires that have broken off. just need to know were to connect the head phone wire's and there's no mic with this head phones..

  • humbucker611 Aug 26, 2010

    the main computer still powers ok just need to see were the headphone wire's reconnects. the head phone are sennheiser noisegard pxc 250.

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If you are talking about the wires from the front panel inside of the pc ...the wire diagram it is present into the manual of the motherboard..and they are numbered and a tab with each one place is present into the manual..of the motherboard (computer ) ..
anyway ..you can use them in the back panel ...cause on the sound card there is a green exit for the headphone ...in the middle..and a pink (red) one ..for the microphone ..and will work just like in the front panel..
or ..if you use the speakers into that back green exit..just plug the headphones into the speaker's headphone out ..and will be even better cause there is a little preamplifier ..and use a separate microphone ..or the microphone from the web cam ...
If you are talking about the jacks from the headphones wire ...just tide them back to the jack s..and to know which one is which ..just make some trials..insert the jack in the sound exit..and after that try to see which ones..(2 of them one colored and one ground..) will make sound in the headphones...Those 2 will be the ones for the headphones..and the other 2 will be the microphone..

Posted on Aug 26, 2010

  • Catalin Turcu
    Catalin Turcu Aug 26, 2010

    By the way ..if the headphones are ok ..and you are talking about the front panel of the computer being damaged..you can use both the headphones and the speakers..by using a 2 input splitter adapter for jack 3.5 ..like this one ..and plug them both ..speakers and headphones in the green in the back ..if you do not have a input for headphones on the speakers...and this way you will be close enough to plug the microphone in the edge pink one..
    here is the adapter Im talking about ..available in all electronics shops and computers shops..
    http://www.maplin.co.uk/Module.aspx?Modu...

  • Catalin Turcu
    Catalin Turcu Aug 26, 2010

    http://www.frontx.com/cpx090_b2.html
    here you have the front headphone wiring ...scheme.. the cables will get into the places where the jumpers are (the jumpers have the function to connect them when the front headphones panel is not connected..and in your case will not be present if they were connected before..

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Usually red is right and green is left leaving copper as ground. Click on this link below to watch a video on how to repair a set of headphones

http://www.metacafe.com/watch/1045725/how_to_solder_how_to_repair_headphones/

Posted on Aug 26, 2010

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I have found this problem on several PXC 450 headsets and it can be solved by resoldering the bypass switch pins on the circuit board. We use about 25 pairs of these headsets and although they are excellent they can suffer from dry joints mainly on the switch but I have found a surface mount resistor in one case to be the problem.
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If lower down in the twin cable part, then you can cut it off before the break and solder a new 3.5mm plug on. The two coloured wires in the cable fit on the small lugs of the plug (you will have to work out which is left or right, by trying them on each lug. The other wires are earths, which fit together on the large metal flange. The T piece part of the large flange grips the black cable, to stop it pulling out. PS make certain you put the plastic body cover of the plug on the wire before soldering on the plug. That you just slide it back on the plug. Make certain the wires on the plug don't touch the earths and also the left and right don't short.
Once you have the plug on, you can buy an extension cable for headphones. This will make it long enough to use.

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1 Answer

Hi, could you please provides a circuitry diagram for PXC250.My headPhone was broken, i'm gonna to fix it.cheers!


Looking at them from the picture provided by FixYa, I rather think there's no circuitry involved! It looks like the wires go into two speakers. As you don't say what the fault is then I will guess a few things for you and some solutions.
1 One side dead - fault in plug or cable or speaker.
2 Cutting out - faulty cable or plug.
3 No sound - faulty cable or plug.
If you need to get to the speaker, remove the pad, remove foam (force it if it won't come off, glue on when finished). You should see screws then.
You should be able to get a new cable/plug from any good electrical parts shop such as Maplin or RadioShack. You will probably need to contact the maker for a new speaker.

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The impedance or resistance of the two different sets of wires might be different. The higher the impedance the less signal. If your cable is long enough you are better off spending the five or so dollars for a new plug. Red is right, green or blue is left and copper is ground.( Usually) Unfortunately not all manufacturers agree. Also what could have happened is a short between the wires that you soldered.Make sure they are physically separated from each other and insulated.

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My jack plug lead got yanked and broke the wires inside the electronics unit. There are three screws to undo in order to get inside the electronics, one by the cable entry and two very small cross head scvrews in deep holes halfway along the unit. I cut the jack lead on the outside close to the cable entry and drilled out the hole through the cable guide and then poked the jack cable back through the hole into the electronic unit. I was able to solder the three leads to their respective pads. There are five solder pads next to the cable entry. With the cable entry at the top, the middle pad connects to the green cable, the rightmost pad connects to the red cable and the copper connects to a pad about 1 cm down from the rightmost connector. The technique was to tin the ends of the leads with solder before soldering them to the pads. I used a blob of glue from a glue gun to hold the cable in place inside the electronics unit. My plan B if the soldering was not possible was to take a jack plug and lead from an unused set of earpieces and use that lead in place of the original. It would have been much more difficult to replace the lead from the electronics unit to the headset.

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