Tektronix Z740/DX - Phaser 740 Extended Color Laser Printer Instruction Manual page 86

4
Troubleshooting
Print quality problems (cont'd.)
A piece of the printed image
is missing and reappears out
of place, approximately
129 mm (5 in.) down the
page.
The surface of the printed
image appears to have
vertical scratches (visible by
holding the print at an angle
and observing the "shine" of
the image).
At first, the scratches appear
only on the printed image;
eventually, dark vertical
scratches appear on the
unprinted portion of the page.
Light vertical streaks appear
in all colors (most easily
visible in yellow).
Dark and wavy vertical
streaks appear in all colors.
76 Phaser 740 and 740L Laser Printers
Print 20 pages of blank pages to clean the roller.
If you still see the problem:
Replace the Fuser Roll.
If you still see the problem:
Replace the Fuser.
Replace the Fuser (depending on your quality needs, you can continue to print until the
dark vertical lines appear).
Replace the Main Charge Grid. Complete instructions are packaged with the Main
Charge Grid.
The solution is one of the following:
Remove and reinsert the Main Charge Grid.
Replace the Main Charge Grid.
Replace the Imaging Unit.