I have a Canon MF-4800 printer/scanner. It's been working fine up to last week. Now as you can see from the screen shots, it is mangling characters when printing. It scans ok, and prints test prints ok - also shown in another screenshot.
The machine is connected to my local network and is used by three Macs computers running slightly different versions of High Sierra.
I've tried:
Cleaning the printer,
Reconnecting the printer to my network,
Downloading new drivers
Any ideas would be welcome.