We have a Xerox Phaser 8400 that is printing black on 1/2 of the page and a faded black to dark green on the other. If it is built the same as the 8200 series there are two halogen lights that heat the drum in the preheater unit. My opinion is without tearing this thing apart is that one light has gone out. Does this sound right or could there be another problem to consider.
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Re: Xerox 8400 light printing
No, If one lamp goes out they both will not function. They do not have anything to do with print quality.
You may have a bad maintenance kit. but more than likely you have a bad print head.
Run the cleaning , eliminate stripes and eliminate smears modes. But more than likely the print head is bad. I would say a bad print head is about a 95 percent chance of causing your problem.
The halogen lamps only heat the drum, and if one was bad the machine would fault out with a 15,004 code.
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I've seen this issue on some of my other Xerox machines (not the 8400 specifically). 9 times out of 10 the solution is to update both the printer driver to the newest version, as well as updating Adobe Reader to the newest version.
I would call xerox second level support. There has to be a problem with that driver . I have seen this problem more than a few times. call 1-800-835-6100 and see if they have an alternative. This is an obvious flaw in the driver.
Are you using third party toner? That is one thing that causes that problem. Use only xerox toner.
The other thing is that your image unit could have come defected, if it was brand new. Try changing the image unit and that should fix that problem. Good luck. 016-1993-00 image unit & toner 016-1977-00
What you are describing is a bad print head. You can try running the eliminate light stripes several times, and jet substitution, but most likely the print head will have to be replaced to remedy your problem. You can try googling. Phaser printer print heads or phaser printheads. There seems to be a secondary market appearing for those print heads. I can tell you from Xerox, if you have no maintenance agreement, they cost $750 per print head. Honestly, having worked on about every type of color printer known to man, the new solid ink phaser printers, produce a dry ink image of 2400 x 2400 dpi with ink particles that align end to end. The resolution of those printers are remarkable and can be purchased for less than the price of one of those new print heads. Now for reliable, albeit somewhat not as sharp a color image, but still exceptional, you really can not beat an HP. The ink stick technology really no longer has the color vividness advantage it initially had. The inks that align end to end, have ended that advantage and are sure a lot cheaper to operate per page.
Dark streaks are an indication of "burned" or overheated ink. This will occur when the printer sets for a long period of time and nothing is printed. The problem will usually disappear after 50 pages or so, unless the printhead is damaged.
If the print remains dark, the printhead will need replaced.
(Dark print can also be caused by using Non-Xerox ink)
You can go into the trouble shooting menu and do the "eliminate Light stripes" procedure a few times. Then you can do Jet substitution from the same menu. If that does not work then most likely you need a new print head. If you have used non xerox ink sticks that is your most likely cause of the problem. cheaper is not always better