How to fit replacement earpads to sennheiser pxc 300

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.
To get to this board you need to unclip earpad on side containing switch then undo a number of philips head screws to reach the circuit board under the speakers then unscrew circuit board resolder and re assemble. Good luck.

The bypass switch developes dry joints after some time. The earpad has to be removed and the speaker plate unscrewed and lifted back. The cct board connected to the switch will now be exposed so the switch legs can now be resoldered. Reassemble and you should be good to go.

Spare parts for these headphones are available at the following website

http://www.custom-cable.co.uk/sennheiser-hd400-hd470-replacement-earpads-black.html

Regards

Found these pads available at the url below, they are not original but they are still exceptional quality.

http://www.custom-cable.co.uk/sennheiser-hd400-hd470-replacement-earpads-black.html

http://www.jntworld.com/catalog/index.php?cPath=21_1002&currency=gbp&osCsid=c5b2f0de48c59564afb36dfebba513ac#tabbed_box_1

Here you will find something.

I had the same problem, until I realized that the headphones have 2 batteries. I was only replacing one.

You might want to take a look at my Tip on headphones, right at the bottom of it. Just click my user name to find it.

The ear padding is attached to and held in place by a plastic ring that fits into the speaker mount. Gently pull the ear padding outward so you can see the ring, then slip a flathead screwdriver or other object in (just a bit, you don't want to poke the speaker inside). Gently pry up , sliding your pry-bar along, and the pad should pop out quite easily.

http://shop.sennheiserusa.com/retail2002/ProductDetails.aspx?direct_cat=Parts&direct_prod=514053

it looks like you can buy some replacement ear pads from the following link.

http://www.thomann.de/gb/sennheiser_pmx_60_ohrpolster.htm

hope this helps. :)