Question about Xerox Phaser 8500/DN Printer

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Intermitent fuzzy printing

Every now and then we get 1 page that is fuzzy ~ looks like it would if you were drunk :-) If you print it again it's clear ~ nice quality. We've ran the tests to eliminate smearing and light stripes and it still continues to happen. Any ideas as to why this is randomly happening? Thank you.

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Most Likely its oil from the drum, has migrated to the encoder.
Call a service center, they have to clean the encoder, and If the problem comes back... then the drum assy needs replacing.
I've seen this problem many times...
Hope that helps.

Posted on Apr 18, 2008

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What is happening is your print head is moving slow. The most likely cause is that the print head block is getting sticky from some ink seeping into it.
2 things you need to do.
1. Remove, ( looking from the front) the left cover. In the middle of the machine, near the bottom, you will see a square block, made of stainless steel ( silver), about 1 inch square. That needs to be cleaned so that the print head gets into print position.
2. Remove the left and right covers, and the ink loader ( where you load the ink sticks) and be sure the cables to the print head are not to tight.
Exactly what is happening, is the print head is stopping just short of faulting out, and to far away from the drum to make a clear image. When it stops out to far, the ink spray is scattered out causine that blurry look. Ok ok, it looks like what a page would look like to me, about midnight on Friday or Saturday night. Wellllllllllllllllll midnight would probably be a bit late, maybe about 7 PM on Friday or Saturday LOL.
But one of those 2 things is 99.999999999999 precent the likely culprit. Have a great weekend, and if your prints are blurred 1 AM tomorrow morning, Please don't blame the printer LOL......
Let me know if you need more info ok?

Posted on Apr 18, 2008

  • 2 more comments 
  • Rick Kasper Apr 18, 2008

    On second thought, Do you intermitteltly drink?? That could be the problem ,, Heheheheheheh, Just kidding.

  • Rick Kasper Apr 18, 2008

    Orrrrrr looking at your post title, Stop drinking FUZZY navels...

  • Rick Kasper Apr 19, 2008

    Guest is correct, that had slipped my mind but the encoder can become contaminated with oil.

    Good pick up ..

  • Rick Kasper Apr 19, 2008

    Sorry I missed that. But if you want to supply an E-mail I can send you the procedure and part numbers.


    Blurry Prints Caused by Oil-Contaminated Drum Encoder. Oil on the Encoder Wheel causes Drum Rotation Position problems


    Oil on the drum encoder's disk produces erroneous positioning signals to the electronics module. This results in the drum rotating at the wrong speed during imaging. The resulting prints appear blurry, with the image distorted in the Y-axis, vertical direction. Figure 1 illustrates the problem. Horizontal, X-axis printhead movement is not affected.



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