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There are three possible solutions.
Try running the 'remove print smears' routine from the print quality
troubleshooting menu. You may have to run it 5 or 6 times to
completely clean the drum.
It may be that the drum maintenance pivot plate is cracked, this
causes the plate to press the maintenance kit on to the drum
unevenly. You will hear a ripping sound as the paper exits the
printer, this is due to it literally ripping the ink off the drum.
Being an 8400, if your pivot plate (the assembly that your maintenance
kit slides on/in to) is white (off white) in colour, my money is on that
The third possibility is that the cam shaft that pushes the pivot plate up to
the drum has loose/spinning cams which again, will cause the plate to press unevenly.
Hope this helps.
The error is normally caused by the print head wiper being stuck to the print head or the print head pivot block being contaminated with spill over ink.
To clean the block you remove the left side cover. There is a stainless steel block about 1 inch by 1 inch about midway back on the lower frame. It would most likely have a lot of yellow ink in it.
If the wiper blade is tacked to the print head, you would remove the right and left cover. then remove the ink loader. ( where you place the ink sticks.). Once you remove the ink loader you are in the print head drum area and would gently detack the blade from the print head, then run the eliminate light stripes in the troubleshooting menu.
The onlty thing I can find close to this is.
Acording to the manual its a ink loader error like your loading the wrong type of ink like the puzzles pieces arent matching and hitting the sensor flags right. Yours by the 8 is referring to the black ink. Anyway go to troubleshooting on the control panel. then to service tools. when in service tools press and hold the up arrow while still pressing the up arrow press the down arrow. the display should say hidden menus. go to diagnostic mode press enter go to funtion menu. then go to clear ISC fault and enter. ISC=ink stick count fault. I hope that helps. Just to let you know Ive had nothing but problems with third party ink and once its in the system its hard to get out so I would watch what im doing with my expensive equipment
Check for and remove any media, jammed paper, or debris found in the exit path. Did this correct the problem?
Clean the Drum Maintenance Kit wiper blade or replace the kit. Did this correct the problem?
Check the exit area, exit frame, Preheater, Drum Maintenance Kit, Printhead, and Stripper Blade for anything touching the Drum. 2. Reseat any component interfering or touching the Drum. 3. Clean the Stripper Blade. Did this correct the problem?
Pull the maintence kit and look in the hole. If your printhead maintenance pivot plate (that the maintenance kit hangs on) is white, it needs to be repalced. It's probably cracked and flexing, not lubricating the drum properly. At the same time, the DM camshaft should probably be replaced. The cams crack on the thin side and rotate on the shaft, causing the maintenance process to malfunction.
hi david i hope i can help you? you may need to give the machine a good clean, if there is any rubber wheeles? give them a clean with meths. little rollers check to see if any carbon brown in colour. its caused by constant use. i hope this has helped you? top tip you must make sure all the brown is completly away. to make your machine run better.
nope its not a drum problem, That drum never goes bad. You are having a problem with some blocked jets in the print head. You can scroll through your menu to troubleshooting and there are cleaning modes to eliminate light stripes and to eliminate smears. Run the eliminate light stripes maybe 2 or 3 times. If that doesn't work, then try the jet substitution mode. That is better described at Xerox.com, click support, then enter phaser 8400 in the search box, click support again and then enter "jet" in that search and follow the directions. If those do not work then your print head is most likely bad. Thats more likely if you have used non xerox ink sticks.Being low on ink should only give you a message that its low.
The 8400 has a known issue with the plastic that was used for the tilt mechanism on the oiling roller. If you look inside where the cartridge is removed you should see a crack that opens when pressure is applied. The high heat causes this unit to crack. You need that part. Or some good super glue. I have fixed 3 of my 8400's with this same issue.