Ghosting; Unfused Or Partially Fused Printing; Image Is Skewed On The Paper; Stains On The Back Of The Print - Tektronix Z740/N - Phaser 740 Color Laser Printer Service Manual

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. This results 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?
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?
3.
Swap the tray that the affected print originates from.
4.
Ensure that the paper feeder is properly installed. Inspect its paper pick
roller. Look for obstructions in the paper path.
5.
Clean the intermediate and aligning rollers.
6. Replace the paper feeder.

Stains on the back of the print

1. Do not touch the surface of a second bias transfer roller.
2.
Empty the waste bin of the second bias transfer roller.
3.
Clean the paper path of the paper feeder.
4.
Inspect the fuser rollers for contamination. Replace the fuser.
5. Replace the paper feeder.
Service Guide
51