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Old 13th December 2014, 03:16 PM   #1
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Default How to bypass volume potentiometer Sennheiser PC360

Hello!

I'm new to this forum and looking for some help with my Sennheiser PC360 headset.

The potentiometer makes a crackling sound and I've read something about bypassing the volumeknob.

I know how to solder but I don't know which wires to solder. I've included a photo of the backside of the potentiometer. I really hope anyone can help me with this

Thanks in advance

Click the image to open in full size.
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Old 13th December 2014, 04:41 PM   #2
Mooly is online now Mooly  United Kingdom
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If this was on the table in front of me it would be easy to figure out, identifying it from pictures much less so. It really is a case of just linking the control out, but its hard to make it out clearly.

What puzzles is that there are three wires entering. That could be stereo feed, L + R + common. I can only see two wires exiting (to other earpiece ?)

Could you do a clear picture looking straight at the circuit board perhaps ?
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Old 13th December 2014, 04:58 PM   #3
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Hi Mooly,

Thanks for your reply.

I think the sound enters at the two wires and exiting in 3 to the other earpiece.

I'm not at home so I can't make a picture at this time.
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Old 13th December 2014, 05:11 PM   #4
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If I'm honest I can't just suss it out from your picture. The headset isn't mono surely ? just two wires as input ?

The control will either be in series with the earpiece or it would be wired as a true "volume control" with the earpiece feed taken from the wiper of the control. For stereo there would be two identical "gangs" on the control.

More pictures really, a close up of the PCB and an overview showing all the leads and earpieces and there leads.
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Old 13th December 2014, 05:20 PM   #5
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This might help you figure it out. The control will be wired either in series or conventionally as shown here. For stereo you would double up on the circuit. So that three or four wires entering (there can be one common connection shared between the two channels)

For mono the two earpieces may just be series wired and connected to either arrangement of control.
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Old 13th December 2014, 05:55 PM   #6
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Well, to make it even wors, it's a surround set with bass. I will take a picture again as soon I'm at home :-)

ps: could the mic have something to do with it?
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Old 13th December 2014, 06:07 PM   #7
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I wouldn't imagine the mic has any connection to this tbh. I think we'll have to wait and see what the pictures show and try and take it from there
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Old 13th December 2014, 06:12 PM   #8
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I'll be heading home now and will post a picture within 30 mins
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Old 13th December 2014, 06:14 PM   #9
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OK (it might get to tomorrow before I can take a detailed look though)
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Old 13th December 2014, 07:02 PM   #10
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Well, I hope this helps

Click the image to open in full size.

Thanks in advance!
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