Xerox DocuColor 12/DCCS50, Service Manual

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10-86 DocuColor 12/DCCS50
Image Processing (All Configurations)
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Principles of Operation
Image Processing (All Configurations)
All machine configurations include a Halftone PWBA. This board accepts the image from the
VSEL PWBA four times, once per color: yellow, magenta, cyan and black. For each color, each
pixel has a value from 0 to 255 (8 bits/pixel). This value controls the amount of time that the
ROS drive pulse is active. A value of 0 shuts off the pulse completely, while a value of 255 pro-
vides the maximum pulse width. Most the functionality in this PWBA is located in six ASICs.
Figure 1 LDD PWBA and ROS Simplified Schematic Diagram
The Halftone PWBA uses its 600 DPI image data input to create pixels of various sizes and at
various pitches when printing text and graphics. As shown in
Table 1 , these include the follow-
ing combinations of types and resolutions:
• 600 vertical and horizontal lines per inch (600L)
• 300 vertical and horizontal lines per inch (300L)
• 200 rotated lines per inch (200R)
• 200 pixel clusters per inch (200C)
• 150 pixel clusters per inch (150C) (Only available for files received from the DFE).
The positioning of the rotated lines depends on the color of the line. Magenta is placed at 45 °
clockwise of horizontal, yellow and black are vertical and cyan is placed at 45 ° clockwise from
vertical. These are shown in Figure 2 .
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