Lexmark T640n User Manual

Solving print quality problems
111
Troubleshooting
Entire page is white.  Make sure the packaging material is removed from the print cartridge. 
 Check the print cartridge to be sure it is installed correctly. 
 The toner may be low. To utilize the remaining toner, remove the cartridge by gripping 
the handles with both hands. With the cartridge arrows pointing downward, firmly 
shake the print cartridge side-to-side and front-to-back several times to redistribute the 
toner. Reinstall the cartridge...

Solving print quality problems
112
Troubleshooting
Part or all of the page is 
printed in black.Check the print cartridge to see if it is installed correctly. 
The job prints, but the top and 
side margins are incorrect.  Make sure the Paper Size setting in the Paper menu is correct.
 Make sure the margins are set correctly in your software application.
Ghost images appear.  Make sure the Paper Type setting in the Paper menu is correct.
 Replace the photoconductor kit.
Gray background prints.  The...

Solving print quality problems
113
Troubleshooting
The quality menu operator panel options can be adjusted to help improve print quality. 
In addition, the Enhance Fine Lines and Gray Correction options can be enabled to improve print quality. These settings are 
available on the driver and on the printer Embedded Web Server (EWS) interface. For more information about these 
options, see the driver Help. 
Menu selectionPurposeVa l u e s†
Print Resolution To select printed output resolution 600 dpi*
1200...

Notices
114
Notices
Trademarks
Licensing notice
Conventions
Electronic emission notices
Noise emission levels
ENERGY STAR
Waste from Electrical and Electronic Equipment (WEEE) directive
Laser notice
Statement of limited warranty
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Trademarks
115
Notices
Trademarks
Lexmark and Lexmark with diamond design, Drag’N’Print, MarkNet, and MarkVision are trademarks of Lexmark 
International, Inc. PrintCryption and StapleSmart are trademarks of Lexmark International, Inc., registered in the United 
States and/or other countries.
LEXFAX is a service mark of Lexmark International, Inc.
PCL
® is a registered trademark of the Hewlett-Packard Company. PCL is Hewlett-Packard Company’s designation of a set 
of printer commands (language) and...

Conventions
116
Notices
Conventions
Note:A note identifies something that could help you.
CAUTION:A caution identifies something that could cause you harm.
Warning:
A warning identifies something that could damage your product hardware or software.
Static sensitivity notice
Warning:This symbol identifies static-sensitive parts. Do not touch in the areas near these symbols without 
first touching the metal frame of the printer.
Electronic emission notices
Federal Communications Commission (FCC) compliance...

Electronic emission notices
117
Notices
Any questions regarding this compliance information statement should be directed to: 
Director of Lexmark Technology & Services
Lexmark International, Inc.
740 West New Circle Road
Lexington, KY   40550
(859) 232-3000
Industry Canada compliance statement 
This Class B digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations.
Avis de conformité aux normes de l’industrie du Canada
Cet appareil numérique de la classe B...

Noise emission levels
118
Notices
Exposure to radio frequency radiation
The radiated output power of this device is far below the FCC radio frequency exposure limits. A minimum separation of 20 
cm (8 inches) must be maintained between the antenna and any persons for this device to satisfy the RF exposure 
requirements of the FCC.
The United Kingdom Telecommunications Act 1984 
This apparatus is approved under the approval number NS/G/1234/J/100003 for the indirect connections to the public...

ENERGY STAR
119
Notices
German GS mark notice
The following measurements were made in accordance with ISO 7779 and reported in conformance with ISO 9296.
ENERGY STAR
The EPA ENERGY STAR Office Equipment program is a partnership effort with office equipment manufacturers to promote 
the introduction of energy-efficient products and to reduce air pollution caused by power generation.
Companies participating in this program introduce products that power down when they are not being used. This feature will...

Waste from Electrical and Electronic Equipment (WEEE) directive120
Notices
Waste from Electrical and Electronic Equipment (WEEE) 
directive
The WEEE logo signifies specific recycling programs and procedures for electronic products in countries of the 
European Union. We encourage the recycling of our products. If you have further questions about recycling 
options, visit the Lexmark Web site at  www.lexmark.com for your local sales office phone number.
Laser advisory label
A laser notice label may be...