In addition to unclear printing, a common problem encountered when printing with a toner printer is horizontal stripes. There are three main possible reasons for this problem:

1. The developer is stained with carriers and the toner is adsorbed by the photosensitive drum or spilled on the paper. Check and deal with it.

2. The stirring device in the developer is not running well or the toner is damp and agglomerated. Check the stirring device or replace the toner.

3. The reflector or lens is contaminated, just clean it.