KW 24 USB unknown device

[mhserrano]

Hello again!

I am utilizing a KW24 to drive an 8X8 key matrix.

When connecting the PCB with an USB cable to Windows 7 SP1, it appears the message on Device Manager

Device Unknown, windows interrupted the device, Code 43

I have tried several times to update drivers, intall again and so on.

Any idea

Kind Regards

Marco

[Guido Körber]

Does it work an another machine?

If not probably the data lines are switched.

[mhserrano]

Thanks for your answer,

It does not work in any computer.

I have changed the USB port and do all sort of changes and it does not work.

Besides, the chip seem to be hot when the PCB is connected.

I think it is damaged.

[Guido Körber]

Likely it is defect, the chip should not get warm at all

[mhserrano]

Yes of course, I work perfectly fine with an IOW40 PCB, and never get warm.

Is it possible to change this product?

[Guido Körber]

Usually not. All parts are tested before we ship them. And we can not verify how the parts are handeled after they have been shipped.