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The lines are more than likely caused by either the Drum, Developer or Fuser unit. I have found in many cases that if non genuine toner is being used this will give you poor quality images. You can try using genuine toner which may resolve your issue but you may have to run a few hundred prints to clear out the old toner before the image improves.
Is this a 2844Z? the 2844 is an EPL printer and the 2844Z is a ZPL printer. Since your have described the printer as 2844 but mentioned that you are performing 3-flash proceedures, it sounds like you have installed the wrong driver. uninstall the driver and install the LP2844z driver so that you can send the correct print language to the printer. If this is not the case, then you need to clarify:
What is your model?
Details about the driver installed?
Firmware version of your printer?
Connectivity? (Serial, USB or Parlallel)?
What are the characters that are coming out on the page? ASCII -Extended?
1.install the latest print driver; see if the rip/spool time is long or the printing time is long. The rip time depends by your computer (!) and the print driver (disable the collate option when printing multiple copies of 1 page = on the printer you should see 1/5 spit a page then 2/5 and spit another page for 5 copies of same page. If you see processing the spit the page then processing and spit the page means your computer is sending 5 times the same page instead of sending once and ask for 5 copies !!! ) 2.use network connection instead the USB. 3.expand the printer memory 4.switch the printer from PCL to KPDL or Auto when printing pdf files.
when you open the left cover you will see some green plastic things. If you pull these towards the left they will clean print heads and charge coronas. If this does not fix the problem the you will have to remove the dev and drum units from the machine. The print head sits on top of the drum unit and can be levered off with the three tabs gently lifted. the entire print head can be remove once the black cover has been unhitched from the sides. The print heads are not screwed in and what ever you do DO NOT TOUCH THE SCREWS on the print heads as they are only for density adjustment