Question about Xerox DocuColor 12 Printer

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DC12 - Yellow Banding (top to bottom)

Hi, DC12 was working fine and then mid-run had image quality problems. In short after some messing around I've been able to determine that the problem is related to the yellow toner system. If I print a color in any color mode apart from black, the print has yellow bands running top to bottom every one and a half inches. From the waste toner bottle and from inspecting the drum it seems like there's excessive yellow toner being deposited. I've replaced the drum with no change of symptoms, I'm now thinking it could be something to do with the rotatary unit (yellow) or too much yellow toner being taken from the cartridge somehow. I'd really appreciate it someone could give a few pointers. Unfortunately I don't have local xerox support otherwise I'd have called them in by now. If any of you have had or heard of a simialr problem, I'd sure like to hear from you.
Regards Carl Grainger.

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Re: DC12 - Yellow Banding (top to bottom)

There is a software patch on the site.
Once there click Support and Drivers.
Once there in the search box enter dc 12
Once to the Support area. Type in Yellow in the search box. That should direct you to the patches.
I hope this helps.

Posted on Jan 03, 2008

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Error ce40

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PRINTERCAT : Hi this is Michelle and i will be assisting you. PRINTERCAT : Error CE40:CE40] Image quality control test pattern abnormality(1) Use "Image quality control abnormal detection counter Y to K display/0 clearing (08-573 to 576)"to check the abnormal occurring condition for each color. PRINTERCAT : (2) Check "Output value display of image quality sensor / Low-density pattern (05-391-0 to 3)" tocheck if the low-density pattern abnormality occurs for each color. The values under 320 for Y, Mand C, and under 220 for K are defined as low-density pattern abnormality. PRINTERCAT : (3) Check "Output value display of image quality sensor / High-density pattern (05-390-0 to 3)" tocheck if the high-density pattern abnormality occurs for each color and identify the color whichpattern is abnormal. If the value is 630 or above, it is defined as high-density pattern abnormality. PRINTERCAT : (4) Set the values of "Image quality closed-loop control / Contrast voltage (08-556)" and "Imagequality closed-loop control / Laser power (08-557)" to "0" (Invalid). PRINTERCAT : (5) Perform "Enforced performing of image quality open-loop control (05-394)". PRINTERCAT : (6) Output the image quality control test pattern (04-270) more than one time and check the patch ofthe color identified in step (3) to see if the image is abnormal (Note). PRINTERCAT : (7) Replace the image quality sensor. PRINTERCAT : (8) Set the values of "Image quality closed-loop control / Contrast voltage (08-556)" and "Imagequality closed-loop control / Laser power (08-557)" to "1" (Valid). PRINTERCAT : (9) Perform "Enforced performing of image quality open-loop control (05-394)" and make sure it iscompleted normally. (Error [CE40] does not appear.) Then perform "Automatic gamma adjustment"( Chapter 3.5.1 and 3.6.1).(10) Clear all "Image quality control abnormal detection counter Y to K display/0 clearing (08-573 to576)". PRINTERCAT : Please note:Abnormal image:Blank print, Solid print, White banding, Color banding, White spots, Poor transfer, Uneven imagedensity, Faded image (low density), Uneven light distribution, Blotched image.''''''''''??320 or above (Y, M and C)220 or above (K)''??Under 320 (Y, M and C)Under 220 (K)Low-density pattern abnormalityCheck the transfer belt. If the cleaning is poor, correct thetransfer belt around its cleaning blade.'??To (9)''''''??Normal '??AbnormalCorrect the items related to the image.

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1 Answer

Hi, I just aquired an HP 4600n color laser printer, it is used but it works good for text but when printing pictures it prints a really bad quality mainly due to a buch of (mostly yellow)lines running the...

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Next. for vertical lines from top to bottom, you will want to inspect the fuser real quick to see if the Hot roller is scored or worn or discolored or any adhesives are adhered to roller. Should be perfectly smooth and uniform in color.
Next, do the consumables life page which is in a menu function.
Information --> Supplies Status Page.
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Repeating defects problem after all consumables

Hi thpep:
Here is a repeating defects ruler. Mach the first defect at the top of the page and alighn with this ruler and it will tell you what assembly is giving you the problem.

Repeating Defects
Maintenance Item Component Distance between Defects
Imaging Unit Developer Roller [YMCK] 28 mm (1.10 in.)
Drum [YMCK] 62 mm (2.44 in.)
Drum Charge Rollers 25 mm (1 in.)
IDT 1 (Y and M, C and K) 132 mm (5.20 in.)
IDT 2 all colors together 132 mm (5.20 in.)
Transfer Roller Transfer Roller 64 mm (2.52 in.)
Fuser Assembly Fuser Assembly 82 mm (3.23 in.)

Defects Associated with Specific Printer Components
Some print-quality problems can be associated with specific assemblies, the most
common problems and the associated assemblies are listed below. Also, refer to the
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Imaging Unit
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■ Repeating Defects
Transfer Roller
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■ Repeating Defects
■ Hot or Cold Offsetting
■ Repeating Defects

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1 Answer

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Each color has its own laser. Use the cleaning wand in the front door to clean the lens covers for each color. You will need to remove the waste toner cartridge in front of the the slots to do this. If that does not cure the problem, you will need to replace the developer housings for the colors that are streaking. The manual can be downloaded at:

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