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Sharp FO 4450 Laser Fax Questions & Answers
Sharp FO-4650 fax machine
You have a bad printhead unit(laser unit) only if the problem persist. The polygon mirror is not rotating within a specific amount of time.
Poor Print quality - black lines appear on page
If you see black lines on the drum, it is very likely that the drum unit is bad. Replace the drum unit and rest the drum counter. If you wait too long, you will cause toner build up in the fuser and will cost yourself several hundred dollars to get it replaced. More in labor than parts.
Use a soft cotton or very soft paper towel and wipe the excess toner from the drun. If there are lines worn in the surface of the drum, then replace it ASAP.
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