HP 3150, 3100 Light character, Shadows or Repetitive marks Appear on, Character voids, Background

Problem Cause Solution

Light character	A roller is damaged.
shadows or
repetitive marks
appear on the
page.	The HP LaserJet 3100/3150 product
	needs to be cleaned.
	If you are using transparencies, they do
	not meet HP’s specifications.
	The paper’s texture is too coarse.
	The toner cartridge is damaged, causing a
	repetitive black flaw on every printout.
	The toner cartridge’s photosensitive drum
	has been overexposed to bright light,
	causing repetitive defects (usually a fuzzy
	black area).

Use the “Repetitive image defect ruler” later in this chapter to determine which roller is damaged. Replace the roller.

See the appropriate sections of Chapter 3, “Maintenance.”

Make sure that the media meets specifications detailed in HP’s media specifications guide.

Try changing to a paper with a smoother finish.

Replace the toner cartridge.

Replace the toner cartridge.

Character voids	The paper or transparencies do not meet
appear (white	HP’s specifications.
areas within the
parts of characters
that should be	You are printing on the wrong surface of
solid black).	the paper.

Make sure that the media meets specifications detailed in HP’s media specifications guide.

Remove the paper and turn it around. (The wrapper on many reams of paper has an arrow indicating the print side.)

Background	Background scatter results from bits of
scatter appears on	toner distributed on the front or back of a
a printed page.	printed page. Background scatter often is
	isolated to a specific area of the page.
	Toner has spilled inside the product.
	The pickup roller is dirty.

Try changing the print density setting. If that doesn’t work, change the paper type, weight, or surface finish. If background scatter occurs on an envelope, try moving the text to an area with no seams. Printing on seams can cause this problem.

See the appropriate sections of Chapter 3, “Maintenance.”

See the appropriate sections of Chapter 3, “Maintenance.”

EN Image formation troubleshooting 161