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Do the colour prints when printing RGB look all right?
If so, the printer is working.
What sort of CMYK are you trying to print? CMYK EPS prints, maybe?
If so, the the fault is one of not using the correct software; the printer is working, it is just not interpreting the encapsulated PostScript to reproduce a CMYK image. Use different software capable of reading CMYK EPS files. Photoshop is one such piece of software.
Definately CMYK so you can see which colors are out of gamut. If copies are lousy too, then you might have old supplies in the machine. In service sim mode (type # * C *) go to 64-5 and print the test charts directly from the print engine. You should get one greyscale and one color page. If those look bad, then you need a supply change (drum, developer, or belts). In the driver under Printing preferences you have the option to set color schemes until you find one that works. If you still have trouble, get a new driver from www.sharpusa.com, past that a firmware flash may be necessary.
What makes you think the scan is bad quality? How are you proofing it. Did you print in on a printing press or other CMYK device? The CMYK colorspace cannot be displayed on monitors without the program you are using converting it to RGB for display. Are you reading the actual CMYK values with the densitometer?
In my experience, with cheap scanners (under $75,000) it's best to scan to RGB and let Photoshop do the CMYK conversion. Just be sure to use the correct profile for your output intent.
There are several causes of those.
So go to Xerox.com
Click "support and drives"
then in the product name box, Type DC12
Then any line click support
IN the search box type "spots" and read the relevant solution.
As it's printing two little strips (like a 1/4inch) of CMYK dots (one of each color all you need to check the toner cartridge drum, try to wipe the toner drum with a damp cloth on each color cartridge. Secondly check the fuser assembly drum if it has any mark on the drum, try to use a mild isopropyle alchohol to wipe the dirt mark them try printing. this will resolve the issue. if still issue persists then change the color cartridge one by one. This will definitely resolve the issue.