Check the following points to solve the problem:
- To get the best print quality, we suggest using the recommended paper. Check that you are using paper that meets our specifications. Click here to see details of the recommended paper.
- The drum units or toner cartridges may not be installed correctly. Check that the drum units or toner cartridges are installed correctly.
- Wipe the windows of all four LED heads with a dry lint free soft cloth. Click here to see how to clean the LED head.
- Make sure that foreign material such as a torn piece of paper, sticky note or dust is not inside the machine and around the drum unit and toner cartridge.
- Clean the drum unit. Click here to see how to clean the drum unit.