Xerox DocuColor 12/DCCS50, Service Manual

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10-83 DocuColor 12/DCCS50
Image Processing (Digital Copier & Copier/Printer
Principles of Operation
Reissue
1. All yellow (Y) information
2. All magenta (M) information
3. All cyan (C) information
4. All black (K) information
This ensures that toner will be placed onto the paper in the order: black (bottom), cyan,
magenta, yellow (top).
Likewise, all of a pixel’s RGB data must be extracted from memory before it can be translated
to L*a*b* format and provided to the Edit PWBA.
This process is modified if the document originals are 8-1/2” X 11”/A4 or smaller. In this case,
the two images are loaded sequentially into the Memory PWBA in the following order:
1. R1, G1, B1 simultaneously
2. R2, G2, B2 simultaneously
However, the images are extracted from the Memory PWBA in a different order:,
1. R1, G1, B1 simultaneously to construct Y1 and L1*a1*b1*
2. R2, G2, B1 simultaneously to construct Y2 or L2*a2*b2*
3. R1, G1, B1 simultaneously to construct M1
4. R2, G2, B2 simultaneously to construct M2
5. R1, G1, B1 simultaneously to construct C1
6. R2, G2, B2 simultaneously to construct Y2
7. R1, G1, B1 simultaneously to construct K1
8. R2, G2, B2 simultaneously to construct Y2
This enables the Post-IPS PWB to present the color information in the following order: Y1, Y2,
M1, M2, C1, C2, K1, K2, enabling the Xerographic subsystem to simultaneously process two 8-
1/2” X 11”/A4 sheets.
Figure 3 Post IPS PWBA Simplified Block Diagram
Edit PWBA
The optional Edit PWBA permits portions of the scanned image to be removed. As shown in
Figure 2 and Figure 3 , the Edit PWBA is a daughterboard of the Post-IPS PWBA. The image is
accepted from the Post-IPS PWBA format in L*a*b* format and processed in two ASICs.