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 tab of the driver.
• Try installing a new toner cartridge. To see how to replace the toner cartridge, click here.
• Try installing a new drum unit. To see how to replace the drum unit, click here.