1. Clean the drum unit

 > Click here to see how to clean the drum unit.

If you use label sheets for laser printers, the glue from the sheets may sometimes stick to the drum surface.

2. The toner cartridge may be damaged.

Replace the toner cartridge with a new toner cartridge. > Click here to see how to replace the toner cartridge.

3. The drum unit may be damaged

• If you use paper that has clips or staples, the drum unit may be damaged.
• If the unpacked drum unit is in direct sunlight (or room light for long periods of time), the drum unit may be damaged.

Replace the drum unit with a new drum unit. > Click here to see how to replace the drum unit.