T28P Handset Noise Problems

[mbello]

Ok, I have about 15 T46g on my company and experiencing this issue once in a while.

When buzzing sound develops on a handpiece the only solution up to now was to leave it unplugged for many days and even that was hit and miss.

Now after reading your experience I got two handpieces that I knew were buzzing, plugged them to my T46g and confirmed they were still buzzing. Then I opened the first handpiece and removed the silicon/wax completely and tested the handpiece... buzzing sound was gone! I did not need to untwist the cables.

However, my question was: is it gone for good or only for a few months and will develop again like has happened over and over with these phones?

To try to answer that I took the second bad handpiece, tested again to know it was buzzing and instead of completely removing the silicon/wax, I only removed enough so that my screwdriver could make contact with the metal case of the microphone. As soon as I did that, I tested the handpiece and the buzzing had stopped.

Therefore my hypothesis is that removing the silicon/wax fixes the problem because in the process of removing it you will end up touching the mic metal case with a metallic part and it will remove whatever charge was building up on it. So in that sense it is not a permanent fix. However, it may be possible that once exposed to the air the mic will never build up such charge again. Who knows? I guess only time will tell.

At least now we are getting close to knowing how to fix our handpieces.

Tip: when opening the handpiece, after taking the screw out pull the handpiece apart by making pressure where the RJ11 port is located. It is by far the easiest way to split it open.