1. There are sticky substances on the drum core, such as grease, etc.

Solution: wipe the drum core with a clean soft cloth.

2. The powder is not filled well

Solution: Fill the powder carefully, don't add too much at one time.

3. Toner quality is not good

Solution: select good quality toner.

4. There is a problem with the waste powder scraper (such as scratches, aging, etc.)

Solution: Replace the corresponding accessories.

5. There is a problem with the powder warehouse scraper

Solution: Replace the corresponding accessories.

6, the drum core is bruised

Solution: Replace the corresponding accessories.