HP 82143A / HP 82162A foto coupler (encoder) - substitute

[cruff]

My printers are sitting about 24 miles away at the moment, so I can't check it physically, but I may have a part available salvaged from a printer that was in a flood.

If you can determine if the LED or the phototransistor is the bad component, it may be possible to fit a new one. I don't recall how embedded they are in the part.

Edit: It turns out I hadn't saved that part, just the encoder wheel.