Check the following points to resolve the issue:

• Take out the drum unit and toner cartridge assembly. Hold the assembly level with both hands and gently shake it from side to side several times to spread the toner evenly inside the cartridge.

• If the machine indicates Replace Toner status, put in a new toner cartridge.
  > Click here to see how to replace the toner cartridge.
• Check the machine's environment. Conditions such as humidity, high temperatures, and so on, may cause this print fault.
  Refer to Product Safety Guide available on the Manuals section.
• If the whole page is too light, Toner Save Mode may be turned on. Turn off Toner Save Mode in the machine's menu settings or the printer driver.
  > Click here to see how to turn the Toner Save Mode on or off.
• Clean the drum unit.
  > Click here to see how to clean the drum unit.
• Clean the corona wire of the drum unit.
  > Click here to see how to clean the corona wire.
• Replace the toner cartridge with a new toner cartridge.
  > Click here to see how to replace the toner cartridge.
• Replace the drum unit with a new drum unit.
  > Click here to see how to replace the drum unit.