Users at EvilCorp™ are complaining the printer in Building 5 of Area 51 is producing pages that are covered in a black dust. What is MOST LIKELY the issue?
Dry toner is melted onto paper by the Fuser. A dusty black powder on a freshly printed piece of paper is likely an issue with the Fuser failing to melt the toner onto the page. Without this step the toner will move around and spread causing the dusty appearance. The fuser may need to be replaced or it's settings adjusted for the type of paper (e.g. some specialty paper may need a higher temperature - consult the printer's documentation to see if this is possible).
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What is the Fuser and how does it work in a printer?
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What are some common issues with the Fuser and how can they be diagnosed?
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What types of maintenance are required for the Fuser?