Question about Bose QuietComfort 2 Consumer Headphones
The headphones hum when turned on. The humming is much stronger where near a laptop and almost gos away when standing in the middle of a bedroom. The humming is only in the left earpiece. I had not used them for a month and they worked perfectly then.
Mine has had the same problem as the rest, and I just fixed mine. I hope this solution will work for
the rest of you also. The problem is with R82 located on the pcboard in the left ear piece. This
is a variable resistor. Inside this resistor it develops a condition called a dry contact where the
wiper isn't making contact with the conductive surface. If the pot is moved a bit then returned
to its original position, it wipes the contact clean and restores normal function. To access this
pot, remove the ear pad and fold down the cloth from the top just enough to get to the screw
that is closest to the top. After removing this screw, you can remove the arch shaped cover
on the outside. R82 is labeled. The problem is they put a drop of glue to prevent the pot from
rotating. GENTLY! remove the drop of glue. I used a sharp knife and wedged it between the
pot and the glue, do not put too much pressure on the pot. Once the glue has been removed,
not the position of the pot and turn it slightly and the return it to its original position. That is all.
For those designing circuits, make sure that you have about 1mA of current through the wiper
during normal operation. This will prevent this problem.
This may not work for you and I am not responsible for making a mess from your headphones
so try it at your own risk.
Let me know if it works.
Posted on Mar 21, 2009
This solution worked for me (althought it isn't really a fix, rather a way to avoid the problem). My left earphone also buzzes, particularly when I'm near my laptop. However, this is only when the laptop is plugged into the wall. To kill the buzz unplug your laptop's power supply from the wall. Also if there are any other power supplies nearby (like for a cordless phone), unplug them as well.
Not much a of a solution, but at least a temporary work around and definition of the problem.
Maybe the EE guy who posted can figure out a lowpass filter which the powersupply can be plugged into.
Posted on Feb 02, 2009
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