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Here's an article in the Lexmark website on How to Replace the Maintenance Kit Parts on an Optra T Laser Printer. Just click on this link: http://bit.ly/95cW2R. Scroll down for the instructions on how to replace the fuser unit. Hope this helps.
Try putting the old fuser back and see if it gets rid of the error, then if that's the case the new fuser is defective. If not, here's a link to the Lexmark website which gives you instructions on what to do when having that "Invalid Engine Code" error message. http://bit.ly/9D61W3. Hope this helps. Let me know if you need more assistance.
We recommend you choose to save the file within a directory on your computer's hard drive. Once it has been saved, go ahead and run the file. The downloaded files are self-extracting ZIP files. Running this file will create a set of .PJL files and a file entitled Readme.1st. The Readme.1st file also contains directions for sending the file over through a parallel connection.
if the pick wheels are just hanging down you need a bell crank for the auto-compensator this part is 56p1228 turn the printer onto its back this plastic piece is known to break. look to the right its located on the end of the long shaft comming fron the auto compensator and if its broken there should be a spring either in the tray of still hanging from the mount
The broken part is called the bell crank arm part number 56P1228 this is very common. If the printer isn't recognising your tray, remove it and check the little plastic fingers on the left side (half way down the tray) and the metal springs in the printer (left side) which the tray pushes on to.