Re: At the risk of topic drift, can I ask for a recommendation for a mono laser...
LaserJet 4200 - rescued from scrapheap along with a fuser, a few rollers and a couple of toners.
I remember that whenever I had a faulty JetDirect card, I would swap it out and leave it on a shelf. After a few weeks I would plug it into another printer and it will be working. Never had to buy a replacement card, just leave the faulty one resting for a bit!