Update: I bought a Canon MP236n, which is a B&W laser multi-function device that prints, scans, copies, faxes, allows USB and Ethernet connections, and can do Apple Airprint. It arrived a couple of days ago, I have it set up, and it works okay. I'm not at all happy about the output catcher, though. It's not a tray -- it's a flimsy little tongue that pulls out of the front of the machine. Canon was clearly trying for a minimal footprint with this thing, which I think was 9and is) foolish. I suspect that the vast majority of people who are going to buy a laser multi-function device are not likely to push in the paper catcher, remove the paper from the feed tray, and fold the feed tray into the machine between prints.
But what do I know?
Anyhoo, the price was decent from Amazon, and it prints. Scan quality isn't as good as that H-P machine that dies, and Canon's scanning software is vastly inferior to the H-P software. But ... it get's the job done.
I also called several H-P repair places in the area, and the consensus is that the H-P is toast. The prevailing wisdom is that IF it can be repaired, the replacement parts and labor will be considerably more expensive than a new printer.