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August 2nd,1995
4. Print Density Adjustment
The FCIP controls print image density by changing the laser pulse width to
adjust the width of the dots across the page. The beam strength is not ad-
justed in this model. The following table shows the relationship between the
pulse width and the image density.
Mode
Copy Mode
Fax Mode
To change the pulse width, the duty cycle of the laser pulse is changed. For
example, to make the print density 40% of normal, the laser is only kept on
for 40% of the normal duration for each pixel.
5. Toner Saving Mode
In this machine, toner saving is done by reducing the number of dots actually
printed, not by varying the development bias. In toner saving mode, the im-
age data is filtered through the following four-line matrix.
1st line
2nd line
3rd line
4th line
(1: Actual data printed, black or white; 0: Always a white pixel)
•
Note:
Toner saving mode only works when printing fax messages and re-
ports. (However, toner saving is disabled when receiving a half-
tone mode message in NSF/NSS mode.)
•
When toner saving mode is selected, the print image density is
automatically set to "Normal"; in some cases, the image may be-
come invisible if the Lighter setting is used.
Cross Reference
Toner Saving Mode: User parameter 12, bit 2
Edge Enhancement
In toner saving mode, the machine prints a black pixel whenever the data
changes from white to black in the main scan direction. In this way, edges on
the image are printed more clearly.
Print Image Density (User parameter 12, Bits 3 and 4)
Normal
Normal
80 %
Halftone
80 %
Normal
100 %
Halftone
20 %
1 0 1 0 1 0 1 0 1 0 . . . . .
0 0 0 0 0 0 0 0 0 0 . . . . .
0 1 0 1 0 1 0 1 0 1 . . . . .
0 0 0 0 0 0 0 0 0 0 . . . . .
2-17
DETAILED SECTION DESCRIPTIONS
Lighten
40 %
40 %
40 %
20 %
PRINTING
Darken
160 %
160 %
160 %
100 %
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