Tektronix manual Phaser 740 and 740L Laser Printers

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.

■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.

The surface of the printed	Replace the Fuser (depending on your quality needs, you can continue to print until the
image appears to have	dark vertical lines appear).
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	Replace the Main Charge Grid. Complete instructions are packaged with the Main
in all colors (most easily	Charge Grid.
visible in yellow).

Dark and wavy vertical	The solution is one of the following:
streaks appear in all colors.	■	Remove and reinsert the Main Charge Grid.
	■	Replace the Main Charge Grid.
	■ Replace the Imaging Unit.

76Phaser 740 and 740L Laser Printers