Loud Hum on T46 Handsets

[Frank Drews]

Hi,

I did some more detailed inspection of a handset which had the hum symptom.

One of the 4 spring-loaded contact pins inside the grey plug of the handset was bend and not in line with the others.
After manipulating and re-straightening this pin, the hum did go away.

If a pin is bend or twisted, you can wiggle the plug of the cable inside the grey female plug in the handset all the way you like, it won't change the hum. This may result in the false conclusion, that the plug contact is not the issue, but I can confirm 100% that it is.

I think the contact pin may get bend, because the plug is wiggeling a lot.

We will now start using hot melt glue to fix things.

Best regards Frank