Question about Xerox Phaser 7750GX Laser Printer

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Print quality problems after installing imaging unit.

AFTER INSTALLING NEW IMAGING UNIT IN Xerox Phaser 7750, the entire page is covered with a film of what looks like black toner? any ideas?

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Pon ese en el amarillo, si el fondo ahora es amarillo....

Posted on Dec 02, 2009

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If the black film is gritty your new drum could be causing the developer housing to arc. make sure the ground strip on bottom of drum is connected.

Posted on Jul 20, 2009

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Put the old image unit back in, if it prints normaly then you might have bought a defective image unit.

Posted on Jul 08, 2009

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1 Answer

Xerox Phaser 7750 The printer's black fades print after print and totally vanishes. I tried replacing Imaging Unit, Toner, cleaning by wand, etc.


If it is only happening in black then it has to be something prior to the toner reaching the transfer belt; such as toner, developer, imaging unit, or laser. It sounds like you've already cleaned the laser window, replaced the toner, and image unit, so I would inspect the developer. Remove the black image unit and use a flashlight to inspect how well toner is covering the magnetic roller on the developer. You may want to compare it to a developer of a working color to see if they look similar. Also, make sure there are no foreign objects near where the image units go. If an object came loose in there, the arm will not close correctly which could cause the image unit to not make contact with the developer. Hope this helps, and thanks for using Fixya.

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1 Answer

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There is a chip in the bottom of the image unit which stores the image unit life. These can be reset but it requires special hardware and software to do it. You can also buy replacement chips, they're usually about $50 for a 4 pack and you can find them on e-bay. Rechipping with out replacing the entire image unit will result in lower quality prints though.

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There is a snippet on the Xerox website to solve imaging unit recognition problems, link below. http://www.support.xerox.com/support/phaser-7760/downloads/engb.html?operatingSystem=winxp&fileLanguage=en_GB Usually this problem only occurs if the NVRAM has been reset or the engine board has been replaced without backing up the NVRAM. You can download the snippet to your printer through Centreware or by downloading the 'File Downloader' utility from the same page above.
Hope this helps.

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Have Xerox 7300DN Printer. I am getting white lines in black color only. Have done all steps in the Xerox Diagnosing Print-Quality Problems page. Did not solve issue. Supplies usage page states black toner...


It looks like you may have some damage to the black IU. If you have an old one or a spare to try as a test that might help. The drum is easily scratched and this then produces marks or lines in the appropriate colour.

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I have a xerox 7750, error code 9-913


This problem occurs when you buy the wrong image unit.
The contact chip that is located at the bottom of the orange plastic is not for the machine. Replace it with 7750 image unit and that should fix your problem. Black is fault 9-910 cyan fault : 9-911 magenta fault: 9-912 yellor 9-913.

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The only way to reset the image unit drum is installing a new one. The new image unit has a fuse which once blown it resets the counter on the machine. You can call www.iteminconline.com I have their information in my ad place. They are good techs. I once called for a 7300 image unit reset and they said it was almost the same as a 2135 and they gave me this information. well goodluck.

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1 Answer

Grainy image quality on my Phaser 7750


Try something, Send a job with 5 pages to it.
Shut the machine off as a page it halfway out of the exit area.. Open the machine and look at the jammed copies. Are they clear in the imaging unit areas but not upon exiting the machine?
If the image is clear around the drums and imaging unit, then the problem would be in the fuser. If the image is grainy and fuzzy in the image area, You could have a bad second BTR roller, the soft black roller on the left side door. One of the developer housings could be bad. You have to remove the imaging units and look in the opening with a flashlight to see if the developer housing brush is thick on the developer roll.
Could have a bad transfer belt or one of the color housings could be bad.
Less likely is a bad laser. But have you taken the wand that is on the front cover and cleaned the laser exposure slots?

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Xerox Phaser 7750 Imaging Unit Percentage Question?


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Apr 06, 2009 | Xerox Phaser 7750GX Laser Printer

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Too much yellow disbursing


Sounds like the yellow imaging unit it defective to be honest. I know its new, but may be bad out of the box.

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Xerox Phaser 6250


How Brave is Jan?

Doubt it be the fuser(100 000life), "just magenta dots".... fuser would be "all smudged" or "black marks" , "the print rubs off" , "paper is creasing or jamming"

Can prove it by stopping a print (open door) when paper is1/2 way threw machine, you need to stop it before it goes threw the hot bit, so you can tell if the hot bit (fuser) puts the marks on the paper.

Transfer roller one would expect to effect whole print Smudged/Faint,uneven density

It will be the imaging unit ( 30 000 pagelife Ouch$ ) or possible leaking toner (if aftermarket)

Remove imaging unit and inspect film you should find image of lines, dots are usually chips or sticky stuff on drum surface, carefull no oily human fingers on surface please.

When stopping machine mid print and perfecting your timing, pull out the imaging unit and look at replica of your print notice if marked and where.

Hope this helps



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