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Please check the following points:

• Check the printer's environment. Conditions such as humidity and high temperatures may cause this print fault.
• If the whole page is too light, Toner Save Mode may be on. Turn off Toner Save Mode in the printer Properties "Advanced" tab of the driver.
• Put in a new toner cartridge. To see how to replace the toner cartridge, click here.
• Put in a new drum unit. To see how to replace the drum unit, click here.