Black toner marks across the page
![Black toner marks across the page](/g/b/img/faqend/faq00000219_019/gb/en/21577/15_tonermark.gif)
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Make sure that you use paper that meets our specifications. Please see "What is the recommended paper?".
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If you use label sheets for laser machines, the glue from the sheets may sometimes stick to the OPC drum surface. Clean the drum unit. Please see "How do I clean the drum unit?".
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Do not use paper that has clips or staples because they will scratch the surface of the drum.
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If the unpacked drum unit is in direct sunlight or room light, the unit may be damaged.
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The toner cartridge may be damaged. Put in a new toner cartridge. Please see the instructions, "How do I replace the toner cartridge?".
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The drum unit may be damaged. Put in a new drum unit. Please see the instructions, "How do I replace the drum unit?".