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.
SOURCE: Xerox Phaser 7750 error code 14 & 15.
try to hold down the on/reset button a few seconds when you power it up ...on most printers this resets them ..about 10 sec it is enough ...
SOURCE: 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?
SOURCE: Xerox Phaser 7750 Imaging Unit Percentage Question?
If you have not had any success after turning the machine off you might have gotten ripped off. where they new? or refurb.. I always buy my xerox consumables from item inc. I have thier information on my ad page. good luck.
SOURCE: Print quality problems after installing imaging unit.
pon ese en el amarillo, si el fondo ahora es amarillo....
SOURCE: Xerox phaser 7760 saying "non-phaser imaging unit"
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.
Fixed! 
Did not fix.
Remove the Phaser 7700 Accumulator Belt and install a Phaser 7750 Accumulator Belt.
TRY FIRST (Solutions without parts):998 views
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