Laser printers do not have a printhead to clean. This type of defect on a laser is going to be in most cases caused by a bad cartridge or a failed fuser. Remove the toner cartridge and look at the blue/green drum on the bottom. If you see toner on the drum corresponding to the defect then your toner cartridge is defective. If the defect is not well bonded to the page then you have a fuser problem.
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