Tektronix Z740/DX - Phaser 740 Extended Color Laser Printer Instruction Manual page 88

4
Troubleshooting
Print quality problems (cont'd.)
Thin horizontal stripes or a
"weave" pattern appears in a
complex image.
Prints have dull, faded colors
Image is very faded or pieces
of the image are missing;
toner on the page is loose.
Photographic images appear
grainy
Streaks or spots
The back of the printed page
appears dirty.
78 Phaser 740 and 740L Laser Printers
Increase the amount of memory.
or
Print the image at a lower resolution.
If you are using a media tray, make sure that you have loaded the correct media in the
tray or
PAPER TRANSPARENCY
If you are using the Multi-Purpose Tray, make sure that you have selected the correct
media type in the printer's front panel.
Print the Color Reference Page from the front panel's Calibrate Colors menu.
Check the density settings for each color and compare them to the examples on the
Color Density Samples card. (in the User Guide).
Print the Consumables Page and Service Print 1 from the front panel's Help Pages.
If all colors are faded on the Test Print, the Imaging Unit may need to be replaced. Refer
to the % Remaining gauge for the Imaging Unit on the Consumables Page.
If one color is faded (and you have checked and/or adjusted the density setting for that
color), replace the Toner Cartridge.
Make sure that the Imaging Unit stays covered until immediately before installing it in the
printer. Exposure to light can damage the Imaging Unit and will produce light streaks or
faded prints.
Make sure that the Toner Cartridges are installed correctly.
Make sure that you use a high-quality laser paper: 60 - 90 g/m
media trays and 75 - 150 g/m
"All about media" on page 5 for more information.
Use only Tektronix transparencies. Tektronix does not guarantee the results of
non-Tektronix transparencies in Tektronix printers.
Try a different color correction mode.
When using the Multi-Purpose Tray, make sure that you have selected the correct media
type in the printer's front panel menu.
Check the front panel's Print Quality menu. If the selected mode is Presentation,
change it to Standard.
Most spots are caused by fingerprints or dust introduced into the printer while installing
the Imaging Unit or loading media.
Make sure that the surface where you unpack the Imaging Unit, paper, and
transparencies is free of dust. Keep supplies in a covered area or a closed box.
Make sure that the Imaging Unit stays covered until immediately before installing it in the
printer. Exposure to light for more than 3 minutes can damage the Imaging Unit.
Do not touch the right side or underside of the Imaging Unit; fingerprints affect print
quality.
Make sure that the media is clean.
Make sure that you handle the media on the outside edges to avoid fingerprints.
To get rid of fingerprint spots, print a few prints (you can print any of the Help Pages in the
front panel menu).
Toner particles have contaminated the transfer roller. This can happen if the printed
image is larger than the media (for example, when printing on envelopes). Run
10-20 prints to clean the transfer roller.
tray.
2
(20 - 39 lb.) paper with the Multi-Purpose Tray. Refer to
2
(16 - 24 lb.) paper in the