Printer and Photocopier Troubleshooting and Repair Collection : HP LaserJet III problems                
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HP LaserJet III problems

"This LaserJet III has me stumped. It has a persistent error 50. I tried everything in the service manual, but to no avail. If anyone has an idea how to fix this, it would be most welcome"

(From: Ted Szypulski ( szypulsk@esslink.com).)

Sounds like an open fuser lamp, like mine was. I have an LJ4. HP would only sell a rebuilt fuser assembly. My cost was $150.00. The fuser assembly on the 4 comes out the rear real easy. There are two captive screws to loosen and then it just unplugs. I removed mine and took it to another LJ4 just to be sure that was the problem before buying a new one. My testing with an ohm meter also proved the fuser lamp was open.

I hope the LJ3 is similar and this is of some help.