HP 4550 manual Imaging drum defects, Causes, Actions

Imaging drum defects

Causes:

	Damage such as scratches or dents on the imaging drum. These
	usually appear as black or white marks on the page.
￿	Paper dust adhering to the imaging drum. These usually appear
	as white marks in the dark printed areas of the page.
￿
	Exposure of portions of the imaging drum to light. This causes
	light sections in the printed output. The life of the imaging drum is
	shortened by exposure to light.
Actions:
￿	Print at least four configuration pages to determine if the defect
	repeats in the same horizontal orientation.
￿	Inspect the imaging drum for scratches, dents, or other damage.
	Replace if needed.
	If the problem is dust, remove the dust with isopropyl alcohol
	applied with a lint-free, static-free wipe. Try this only if the print
	defect is unacceptable and the only other alternative is replacing
￿	the imaging drum.
	Defects caused by exposure to light might clear up over time. If
￿
￿	severe, replace the imaging drum.

206 Solving problems with the printer EN