I have a 3060 with a electronic hummm that is down by the power supply, I have to get down on my hands and knees to hear it but the whole office says it's annoying to them. Is this a trait for this unit has anyone else seen this??? does anyone have a used power supply they could sell me

Updating the firmware may help you. This extract is from the PDF info of firmware v. 2.42


Previous Changes
KM/CS-2560/3060 Combined Firmware is upgraded to Version 2.40.
Details of Changes
No.
Item
Content
1
Measure for noise generating from the Power Supply PCB
The fixing heater control is a phase control to prevent flickering of the fluorescent lights in the room. However, it came to our attention that noise may generate from the Power Supply PCB in conjunction with the phase control.
We have added a new maintenance mode to set the phase control ON/OFF during the stand-by mode only

yeah, they all do it. its a pulsing buzzing noise. try the firmware update. i haven't tried it yet, but our customers are learning to live with it.

The firmware just reduces the amount of time that it makes the noise.

update..... we did the firmware update and soooo far they are happy

Earplugs. They all do it, a by-product of cheaply made Chinese power supplies.