Printer and Photocopier Troubleshooting and Repair Collection : HP LaserJet 4 - intermittent error code ..  
 Copyright © 1994-2007, Samuel M. Goldwasser. All Rights Reserved. Reproduction of this document in whole or in part is permitted if both of the following conditions are satisfied: 1. This notice is included in its entirety at the beginning. 2. There is no charge except to cover the costs of copying. I may be contacted via the Sci.Electronics.Repair FAQ (www.repairfaq.org) Email Links Page.

     << HPLaser Jet IIIsi - 'User.. |  Index  | HP LaserJet 5L grabbing m.. >>

HP LaserJet 4 - intermittent error code 50

(From: Brian Mathews (icontech@volcano.net).)

I have seen this problem quite a few times and I check the fuser lamp to find it was manufactured by USHIO. After replacement with a Toshiba lamp (not an endorsement, just what the supplier sends) the problem is gone. I haven't ever had this problem and not found that brand of heat lamp in the fuser......