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.
Cleaning the printer,
Reconnecting the printer to my network,
Downloading new drivers
Any ideas would be welcome.