Tektronix Phaser 840, Service Manual

Page: 82 / 207

Service Guide 71
White portion of print is colored
Color on a print where no color should
be printed is often called a latent
image. A latent image remains on the
drum when it should have been
transferred to its sheet of paper. An
insufficient amount of oil on the drum,
provided by a dirty or defective or old
maintenance drawer may be the
problem.
1. Clean the wiper blade of the drum
maintenance drawer. If necessary,
replace the maintenance kit.
2.
The paper preheater may be
contaminated with ink. Clean for
ink smears using the front panel
Troubleshooting function Remove
Ink Smears
.
3.
Run diagnostics to ensure that
printer temperatures are in
tolerance. Ensure that the drum
heater is properly positioned.
Print using a smoother, laser
quality paper. Some recycled
paper brands may be too rough.
4.
Dark rectangular marks on transparency film can be caused by an
accumulation of paper dust and oil on the feed rollers. Run 2 or 3
sheets of blank paper through the printer to clean the rollers or
manually clean the rollers.
5.
Replace the power control board.
6.
Non-functioning printhead data cable. Replace the main board.
7.
Replace the printhead.
0388-69