I have a xerox color qube 8700, the printing is out of line. The linement is off on printed checks.

SOURCE: can't print when there's only black ink

Here's a trick that worked for me - there are two tiny prisms on the back of each ink cartridge, to refelct light to a sensor indicating whether there is or is not ink in the cartridge. Simply put a small piece of masking tape over the non-mirrored prism, i.e. right next to the mirrored prisms, to make the printer think the cartridge is full of ink. Put the small pieces of tape on each of the three empty color cartridges, being careful not to cover up the mirrored pieces, as light relected from these indicates that there is a cartridge in the slot. The printer will run as if it has full black and color cartridges, but set your defaults to only print black.

SOURCE: xerox Phaser 6120 color problems

I am running this one and I perplexed by what your saying.
Although I will offer some ideas.
I am running through my mind why the label would only affect the colors.
So some of what I am saying here is thinking.
That is a carousel color printer, and the label is confusing me, mainly since you said black is fine.
I can understand one color being off with the third party toners, but not all 3.
What you are having in some way has to be a contact issue, as if a piece of the label would up on a ground contact.
I would first try removing the transfer assembly, all the toners and the imaging unit, and carefully inspect for another piece of label.
Look at all the metal contacts on the cartridges and internally to the machine, see if one is dirty or somehow bent.
Go into you menus and run a color calibration series, and also do a memory clear, and NVM/NVRAM reset. But before you do any resets print out a configuration page to confirm your addressing if your using an Ethernet cable.
USB wont make a difference.
The reason I suggest the resets and calibrations is the label could have caused some high voltage arching and therefore corruption.
But, then again, why wouldn't that affect black and white. What does black graphics look like?
This one is making my mind spin.
Calibration makes sense because you say you have wrong color substitution, yet doesn't address streaky appearance That to me suggests a bad ground contact, But why only bad in color LOL.Ahhhh you have me nutty with this one. LOL.
I keep migrating back to software corruption or mis calibration.
Let me know if this makes sense or helps. Reading your problem makes me want to see this one.
Anyhow let me know if my rambling, which is rare helps.

SOURCE: Xerox Phaser 6125 Color Printer

I called Xerox and it seems that it's because the imaging unit is defective. They are seeding me one free of charge. Hope you can do the same...

SOURCE: Color Printer Xerox Phaser 6180 Black Background Print out

Hi,

Try the link below. If the toner is leaking from the cartridge return it to shop were you got it if it is damaged.

http://www.support.xerox.com/SRVS/CGI-BIN/WEBCGI.EXE/,/?St=466,E=0000000001344030351,K=1906,Sxi=11,Case=obj(1307)


Niallbt

SOURCE: Xerox Phaser 6250 won't print colour in Windows 7

Hello!

I had same problem and it was driving me crazy. Try this one:

Control panel -> Devices and printers -> xerox printer with mouse right click

Printer properties -> Options

From list you'll select configuration and it gives you drop down menu and from menu you need to select your printer.

I didn't try this one yet because more solid ink is still on the way but this gave me all printing options back. Before basic printing mode was selected.

Funny stuff, uh?

Testimonial: "see my added comments - thanks again"