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Printouts Become Lightly Colored

A possible cause may be that there is a problem with the original or the amount remaining in toner cartridges is running low. Check the following.

Does the original have background color, is it stained, or are you copying an original such as a newspaper that is printed on thin paper so that text or images on the other side are visible through the paper?

Check the original and then adjust the density to the correct settings.  

Are white areas lightly colored?

Change the setting of <Prevent Fogging>. Setting to <On> may solve the problem.  
If you set to <On>, print density may be lighter.

Is the amount remaining in toner cartridge running low?

Check how much the amount remaining in toner cartridges is left, and replace the toner cartridges as necessary.  
Regardless of the displayed toner level, the toner cartridge may have reached the end of its lifetime due to the machine's environmental conditions and the deteriorated materials in the cartridge. Replace the toner cartridge.