Question about Xerox Phaser 8500/DN Printer

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Phaser 8500 print problem

My print text is coming out of the printer blurred! Never had this problem.

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  • BeeLine Mar 05, 2008

    I have the same problem. It just started about two weeks ago, about three months after the one year warranty ended. I have printed about 11,000 pages and replaced the maintenance kit twice. Now my pages are coming out blurry. Not every page. The problem mostly seems to be the first few pages of a job, then I have to go back and reprint those. It is very annoying and wasteful of paper, ink, and time.

    Xerox support is very poor. You have to pay them to solve problems with THEIR printers.

  • Tinmanlau Mar 10, 2008

    I have the same problem. It will not help even if you use the printer's cleaning procedures wasting a dozen pages. When I need to print say 12 copies, I print 14. The first 2 is almost for sure worthlessly blurry.

    Mine is Xerox Phaser 8560

  • logo2000 Jul 31, 2008

    mi problema es con una Phaser 8400 impresiones borrosas he seguido los pasos el disco encoder tenia aceite lo he limpiado y parece se ha solucionado

  • BeeLine May 11, 2010

    The solution above regarding the oil contaminated drum is correct. I eventually called in a Xerox repair person, and that's exactly what he said the problem was, and exactly what he did. I'm not sure I would want to try it myself incase I screwed it up, but it did solve the problem. Thanks for the post.

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There is an encoder on the end of the drum and some of the lubricant from the maintenance kit seeps into.
That encoder will need to be cleaned well or replaced.

Posted on Apr 25, 2008

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  • Rick Kasper Apr 25, 2008

    Here is the engineering note.




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



    CAUSE:



    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.

  • Rick Kasper Apr 25, 2008


    The problem is caused by oil migrating from the drum assembly's bearing and contaminating the encoder disk as shown in Figure 2. By design the encoder disk is immune to some contamination, but too much contamination overwhelms the system.





    SOLUTION: Fixed! Did not fix.




    Carefully disassemble the drum encoder?s cover to access the encoder disk and then clean the disk.

    1. Turn off the printer.

    2. Remove the right side cover.

    3. Remove the drum fan.

    4. Disconnect the drum assembly's encoder wiring harness from the I/O board. Disconnect the drum heater wiring harness from the drum relay board.

    NOTE: Observe for reassembly how the AC wiring harness routes thru the encoder disk cover and the heater frame.

    5. Free the encoder wiring from the encoder cover.

    Carefully pry off the transparent encoder cover by releasing its five snap-fit latches

  • Rick Kasper Apr 26, 2008


    1. Gently feed the AC wiring thru the encoder cover to move the cover out of the way.

    2. With a cleaning swab, gently clean the oil off the encoder disk. If available, use Xerox cleaning fluid (p.n. 008R90176) to "cut" the oil.

    3. Carefully reassembly the drum encoder. Be sure to correctly route the drum heater AC wiring thru the encoder disk cover and the heater frame.

    4. Print some test prints.



    PART INVENTORY STRATEGY
    If cleaning repairs are not effective, replace the drum assembly,
    p.n. 105-1150-80



  • Rick Kasper Apr 26, 2008

    If you want the notes with the photos so you can see what it is, let me know your E-mail address.

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  • 103 Answers

Hi,

Let me point directly to the common problem that causes print qualities. Please consider the drum's life, you may need to replace it. If you can managed to print the machine diagnostic and counters. You can see the records of all moving parts' and consumables. Have a nice day.

Best regards,
Rosener Guyano

Posted on Feb 06, 2008

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dirty or sitting ink left on paper feed and ink cartridges makin first pages blured

try to clean with little rubbing alcohol

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