Printer and Photocopier Troubleshooting and Repair Collection : HPLaser Jet IIIsi - 'User Maintenance' m..  
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HPLaser Jet IIIsi - 'User Maintenance' message?

"What cause a working HPIIIsi coming up with 'User Maintenance' message in the lcd window. If you pop up the cover and reclose, the message goes away and printer keeps on printing fine."

(From: Jim Hunt (jhuntjr@b-c-i.com).)

I believe this is the message you get after printing 200,000 (I might be wrong) copies which is a reminder to replace the fuser unit. This comes in a kit with new pickup rollers and several other pieces. It is pretty easy to replace