Home > Routine Maintenance > Clean the Machine > Clean the Drum Unit
If your printout has dots or other repeating marks at 94 mm intervals, the drum may have foreign material, such as glue from a label stuck on the drum surface. Follow these steps to solve the problem:
Make sure you put the toner cartridge in correctly or it may separate from the drum unit.
If you put it in properly, the green lock lever will lift automatically.
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