HP LaserJet 1100 Service Manual - Page 125

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Table 5-3. Solving image quality problems Problem Cause Solution Character voids appear (white areas within the parts of characters that should be solid black). The paper or transparencies do not meet HP's specifications. You are printing on the wrong surface of 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.) Poor fusing. Check for wrap jam in fuser. Background scatter appears on a printed page. Background scatter results from bits of toner distributed on the front or back of a printed page. Background scatter often is isolated to a specific area of the page. 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. Toner has spilled inside the product. See "Cleaning procedures" in this chapter. The pickup roller is dirty. See "Cleaning procedures" in this chapter. The page is completely black. The toner cartridge was improperly installed. Remove the cartridge and reinstall it. The toner cartridge is defective. Replace the toner cartridge. Discontinuity exists in the high-voltage contact points. Perform the "High-voltage power supply check," which is discussed later in this chapter. There is a problem in the ECU or the laser/scanner. Follow the steps in "Basic troubleshooting" to isolate the problem. Replace the ECU or the laser/scanner, as needed. 130 Troubleshooting/Maintenance C4224-90962

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130
Troubleshooting/Maintenance
C4224-90962
Character voids
appear (white
areas within the
parts of
characters that
should be solid
black).
The paper or transparencies do not meet
HP’s specifications.
Make sure that the media meets
specifications detailed in HP’s media
specifications guide.
You are printing on the wrong surface of
the paper.
Remove the paper and turn it around.
(The wrapper on many reams of paper
has an arrow indicating the print side.)
Poor fusing.
Check for wrap jam in fuser.
Background
scatter appears
on a printed
page.
Background scatter results from bits of
toner distributed on the front or back of a
printed page. Background scatter often is
isolated to a specific area of the page.
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.
Toner has spilled inside the product.
See “Cleaning procedures” in this chapter.
The pickup roller is dirty.
See “Cleaning procedures” in this chapter.
The page is
completely
black.
The toner cartridge was improperly
installed.
Remove the cartridge and reinstall it.
The toner cartridge is defective.
Replace the toner cartridge.
Discontinuity exists in the high-voltage
contact points.
Perform the “High-voltage power supply
check,” which is discussed later in this
chapter.
There is a problem in the ECU or the
laser/scanner.
Follow the steps in “Basic troubleshooting”
to isolate the problem. Replace the ECU
or the laser/scanner, as needed.
Table 5-3. Solving image quality problems
Problem
Cause
Solution