HP CP4525DN Laser CC494A#ABA manual Solve image-quality problems, Image defects table

Solve image-quality problems

This section helps you define print-quality problems and what to do to correct them. Often print-quality problems can be handled easily by making sure that the product is maintained, using paper that meets HP specifications, or running a cleaning page.

Image defects table

The following examples depict letter-size paper that has passed through the product short-edge first. These examples illustrate problems that would affect all the pages that you print, whether you print in color or in black only. The topics that follow list the typical cause and solution for each of these examples.

Problem	Sample	Cause	Solution
Print is light or faded on entire		Poor contacts exist on the ITB	Clean the grounding contacts. If the
page.		unit and the product grounding	problem remains after cleaning,
		unit.	check the contacts for damage.
			Replace any deformed or damaged
			parts.
		Poor secondary transfer	Clean the contacts. If the problem
		contacts exist on the	remains after cleaning, check the
		secondary transfer roller and	contacts for damage. Replace any
		the ITB.	deformed or damaged parts.
Print is light or faded in a		Poor primary transfer bias	Clean the contacts of the color that
particular color.		contacts on the ITB unit and	produces the light print. If the
		product.	problem remains after cleaning,
			check the contacts for damage.
		Poor primary charging bias
			Replace any deformed or damaged
		contacts with the print	parts.
		cartridge and product.
		Poor developing bias contacts
		with the print cartridge and
		product.
Image is too dark.		The RD sensor is defective.	Replace the RD sensor. See
			Registration density (RD) sensor
			assembly on page 124.

Page is blank.

The high-voltage power- supply lower is defective (no developing bias output).

Replace the high-voltage power- supply lower. See High-voltage power supply lower (HVPS-D) on page 163.

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