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Printouts Become Lightly Colored

A possible cause may be that the amount remaining in toner cartridges is running low. Check the following.

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.