The fuser is the part of a laser printer that uses heat and pressure to fuse the toner to the paper. If the fuser is defective or not hot enough, the toner may not adhere properly and smear when touched. The duplexing assembly, toner, and transfer belt are not related to this issue.
[Reference: Official CompTIA learning resources CompTIA A+ Core 1 and Core 2, page 11., , , , ]
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