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

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

2.Filled with powder

Solution: Be careful about filling the powder, don't add too much at a time.

3.Toner quality is not good

Solution: Choose 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 silo scraper

Solution: Replace the corresponding accessories.

6.Drum core is injured

Solution: Replace the corresponding accessories.