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imageCLASS MF640 Series only printing outlines of black


I replaced the color cartigres and all of sudden it only print the outside lines in black. It doesn't print letter nor in other colors. Anyone know how to fix it? 


My printer is a Canon MF642C/643C/644C


Product Expert
Product Expert

Hello Patriciomisi,

The issue sounds like a toner problem. In this situation, you can try reloading the toner cartridges to make sure they are seated properly and you can check to make sure all packing material has been removed. If that does not resolve the problem, it looks like there is something wrong with the hardware.

We would be happy to assist with the issue. To provide some feedback or some troubleshooting steps, we would need some additional information. If you could reply to this message with the information below, we can provide some assistance.

  1. Which specific model do you have? Your model number will be printer on the front of the printer.
  2. Do you have the same issue when you perform a color copy or a black and white copy?
  3. What version of the Mac or Windows operating system are you using on your computer?