The laser printer broked down (2 paper jams in a short time and then printer stuck with a “jam at exit” message I couldn't clear) so I ordered a new one which came yesterday. I had a little bit of trouble getting hplip working (I needed a newer version for one thing) but once sorted, the printer was working on my Linux network.

The only other problem I had was that I was getting loud beeps when printing. I couldn’t find anything related to sound in the printer’s menu or the manual but a Google search revealed the answer I’d not seen. I’d plugged the new printer into a socket powered via a UPS. The beeps were the UPS complaining about the load when the printer was printing.