Dark, Irregular Steaks In All Colors; Ghosting; Unfused Or Partially Fused Printing; Image Is Skewed On The Paper - Tektronix Phaser 550 Service Manual

6
Troubleshooting
6-28 Phaser 550 Color Printer

Dark, irregular steaks in all colors

Waste toner box full; replace the imaging unit.

Ghosting

Ghosting with some images is unavoidable because of the color structure of the
images. If a color is used at one part of the image area and the same color is used
again at a later area, it is very possible to get ghosting of the first image into the
second image area after one revolution of the toner cartridge developer roller.
This occurs because the charge that is created from the first use of the color was
not totally extinguished, a small residual charge remains associated with the
color, resulting in a second use of the color to be darker in the same areas as the
first image resulting in the first image ghosting into the second image when the
same color is used.
1. A new toner cartridge exhibits less ghosting. Ghosting increase as
toner cartridges age.

Unfused or partially fused printing

1. Is the paper in good condition and appropriate for a laser printer?
2.
Is the printer printing within its environmental specifications? Refer
to the Chapter 1 topic, "Specifications" on page 1-14.
3. Replace the fuser unit.

Image is skewed on the paper

1. Is the paper in good condition and appropriate for a laser printer?
2.
Is the printer printing within its environmental specifications? Refer
to the Chapter 1 topic, "Specifications" on page 1-14.
3. Ensure that the paper feeder is properly installed. Inspect its paper
pick roller.
4.
Clean the intermediate and aligning rollers.
5. Replace the paper feeder.
6. Replace the engine control board.