Please check the following points to solve the problem:

1. Wipe the scanner windows with a dry lint-free soft cloth. Click here to see the details of how to clean the inside of the machine.
   
   
2. The toner cartridge may be damaged. Put in a new toner cartridge as follow:
   
   
   1. Click here to print the chart. [345KB/ PDF]
   2. Compare your printed document with the printed chart to identify the missing color.
   3. Replace the toner cartridge of the color. Click here to see the details of how to replace the toner cartridge.