Lexmark Optra S 1250 Manual

							345Enhancing Print Quality
Enhancing Print Quality
Appendixes
Print Resolution
The Print Resolution setting defines the number of dots printed per
inch (dpi). Usually, the higher the setting, the sharper the clarity of
printed characters and graphics. Higher settings may require more
printer memory and increase the time it takes to print a document.
Not all of the print quality settings are valid for all resolutions.
1200 Image Quality
If you select 1200 Image Quality, the printer varies the size of each
printed pixel, thereby producing a continuous tone effect. This
improves the print quality of graphic fills and images and half-
tones.
1200 Image Quality may require additional printer memory and
may slow print time.
If your printer driver does not provide 1200 Image Quality under
the Print Resolution menu, select 600 dpi and select 1200 Image
Quality under the Options or Features menus.
If Toner Saver is On, the setting for 1200 Image Quality is ignored.
When printing 1200 Image Quality, the printer ignores the settings
for PQET.
Print Darkness
Use the Print Darkness setting to darken or lighten all printed ele-
ments in your documents. Changing the Print Darkness setting
actually increases or decreases the amount of toner used to print
each pixel.
The factory default setting (Normal) should satisfy most of your
printing requirements, particularly for basic text printing. If you
want finer line width, higher definition graphics, or a wider range 
						

							Enhancing Print Quality346
Enhancing Print Quality
Appendixes
of grays, select a lighter Print Darkness setting (Lighter or Light-
est). Select a darker setting (Darker or Darkest) for bolder text and
darker gray scales.
You can change the Print Darkness setting for all resolutions.
Toner Saver
Toner Saver preserves the toner supply by reducing the amount of
toner on the printed page. This may help lower the cost of printing.
Toner Saver is recommended when printing rough drafts, since
print quality is reduced. Setting Print Darkness to a lighter setting,
with Toner Saver Off, is another way to conserve toner.
When Toner Saver is on at 300 dpi and 600 dpi resolutions, there
are five independent levels of Toner Saver available by changing
the Print Darkness setting. Choose a darker setting for higher qual-
ity, or a lighter setting for higher toner savings.
When Toner Saver is On, the setting for 1200 Image Quality is
ignored.
When Toner Saver is on at 1200 dpi resolution, one level of Toner
Saver is available. When both Toner Saver and 1200 dpi are
selected, the setting for Print Darkness is ignored.
PQET
At lower resolutions, printed characters can appear to have jagged
or uneven edges. Print Quality Enhancement Technology (PQET)
smooths the edges of printed characters to improve the appearance
of the text. It may also improve the smoothness of diagonal lines in
basic line art.
While setting PQET On improves the print quality of text, it may
adversely affect the appearance of some scanned images or half-
tones. If you notice reduced print quality with those images, turn
PQET Off. 
						

							347Enhancing Print Quality
Enhancing Print Quality
Appendixes
PQET is available for both 300 dpi and 600 dpi resolutions. PQET
offers the most benefit at 300 dpi.
When printing in 1200 Image Quality or 1200 dpi, the setting for
PQET is ignored.
PictureGrade
In PostScript Level 2 emulation, you can set PictureGrade On to
improve the print quality of halftone images. PictureGrade allows
a higher effective screen frequency while maintaining a large num-
ber of gray intensities.
Set PictureGrade On when printing a detailed graphic or image.
Set PictureGrade Off if photocopies of printed pages are too dark.
Summary
Compatibility of Print Quality Settings
Print Quality
Setting
Purpose
Print Resolution
300 dpi600 dpi
1200
Image
Quality
1200 dpi
Print Darkness Modify darkness of all
printed elements (text,
graphics and images)xxxx
To n e r S a v e r
1Conserve toner x x x
PQET
2Improve text clarity x x
PictureGrade
3Improve quality of
images and halftonesxxx
1Setting Toner Saver on overrides settings for 1200 Image Quality. When both Toner Saver and 1200 dpi are
selected, the setting for Print Darkness is ignored.
2When 1200 Image Quality or 1200 dpi is selected, the setting for PQET is ignored.3Available for PostScript Level 2 emulation only. 
						

							Enhancing Print Quality348
Enhancing Print Quality
Appendixes 
						

							Printer Specifications
Appendix
Printer Specifications349
Appendixes
Printer
Specifications
C
Dimensions
Duty Cycle
Supplies
Optra S 1255
and
Optra S 1625
Optra S 1855Optra S 2455
Height 13.2 in. (335 mm) 13.2 in. (335 mm) 25.6 in. (650 mm)
Width 15.9 in. (405 mm) 16.7 in. (425 mm) 17.5 in (445 mm)
Depth 19.5 in. (495 mm) 19.5 in. (495 mm) 20.5 in. (520 mm)
Weight
141 lb (18.6 kg) 42 lb (19.1 kg) 58 lb (26.4 kg)
Footprint 17.8 in. x 15.9 in.
(451 mm x 405 mm)17.8 in. x 16.7 in.
(451 mm x 425 mm)19.0 in. x 17.5 in.
(482 mm x 445 mm)
1Weight of printer includes toner cartridge.
FeatureOptra S 1255Optra S 1625Optra S 1855Optra S 2455
Duty cycle Up to 35,000 pages
per monthUp to 65,000 pages
per monthUp to 65,000 pages
per monthUp to 100,000 pages
per month
SupplyDescription
Toner cartridges 7.5K and 17.6K (at about 5% coverage) replacement toner cartridges.
Charge roll kit User replaceable charge roll kit for improved print quality.
Label fuser cleaner Recommended for label printing. 
						

							Printer Specifications350
Printer Specifications
Appendixes 
						

							Reference 
						

							Notices353
Notices
Reference
Notices
Electronic Emission Notices
With a Network Card Installed
Federal Communications Commission (FCC) Compliance Information
Statement
The Optra S laser printer, Type 4059, has been tested and found to comply with
the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. Oper-
ation is subject to the following two conditions: (1) this device may not cause
harmful interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
The FCC Class A limits are designed to provide reasonable protection against
harmful interference when the equipment is operated in a commercial environ-
ment. This equipment generates, uses, and can radiate radio frequency energy
and, if not installed and used in accordance with the instruction manual, may
cause harmful interference to radio communications. Operation of this equipment
in a residential area is likely to cause harmful interference, in which case the user
will be required to correct the interference at his own expense.
The manufacturer is not responsible for any radio or television interference
caused by using other than recommended cables or by unauthorized changes or
modifications to this equipment. Unauthorized changes or modifications could
void the users authority to operate this equipment.
Note:To assure compliance with FCC regulations on electromagnetic interfer-
ence for a Class A computing device, use a properly shielded and
grounded cable such as Lexmark part number 1329605. Use of a substi-
tute cable not properly shielded and grounded may result in a violation
of FCC regulations.
Industry Canada Compliance Statement
This Class A digital apparatus meets all requirements of the Canadian Interfer-
ence-Causing Equipment Regulations. 
						

							Notices354
Notices
Reference
Avis de conformité aux normes d’Industrie Canada
Cet appareil numérique de la classe A respecte toutes les exigences du Règlement
sur le matériel brouilleur du Canada.
European Community (EC) Directives Conformity
This product is in conformity with the protection requirements of EC Council
directives 89/336/EEC and 73/23/EEC on the approximation and harmonization
of the laws of the Member States relating to electromagnetic compatibility and
safety of electrical equipment designed for use within certain voltage limits.
A declaration of conformity with the requirements of the Directive has been
signed by the Director of Manufacturing and Technical Support, Lexmark Inter-
national, S.A., Boigny, France.
This product satisfies the Class A limits of EN 55022 and safety requirements of
EN 60950.
WARNING:When a network card is installed, this is a Class A product. In a domestic environ-
ment, this product may cause radio interference, in which case, the user may be
required to take adequate measures.
Japanese VCCI Notice