mf634 and linux mint

Hi,

I have an mf634 hooked up to a dell 7720 precision workstation, via usb, in linux mint 19.x and have installed the driver obtained here:

linux-UFRII-drv-v500-usen-06.tar.gz.

the printer is recognized and activates when giving a print command, but the pages are blank, whether from a test page or an attempt to print something else.

no error messages of any kind.

just "pretends" to print.

any thoughts are much appreciated.

thanks

robert