58 Theory of operation C9148-90909
The CPB controls the following scanning-process control signals:
● ADF unit and scan unit operation
• directs the scanner controller board about when to scan
• directs the scanner controller board about how to scan
• directs the scanner controller board about when to activate motors
• directs the scanner about when to turn the scanning lamp on and off
● Image processing
• color alignment
• resolution conversion
• image sharpening
• moire removal
• image scaling
• shifting of data strips (reconstructing separately processed image data before CPB
communication to the formatter)
• RGB conversion for CPB communication
• CPB communication over the high-speed copy connect cable to the formatter in one of the
following formats:
• Hardware Ready Bits (HRB) (fastpath) communication with the hard disk on the formatter
• PCL-XL (N-up, rotation, book mode) communication with the hard disk on the formatter
• JPEG compression (when sending data digitally) communication with the hard disk on the formatter
• data compression before sending to the formatter over the high-speed copy connect cable
Typical scanning-process flow
1 The original document is placed on the glass or in the ADF.
2 The user selects job preferences by using the control-panel buttons and keys. The user
presses the
START button. Job preferences are sent to the formatter.
3 Some job preferences are held and then processed later (for example, N-up) by the
formatter. Others are sent to the CPB.
4 The CPB sends control signals to the scanner controller board. The document is scanned.
5 The scanner controller board sends scanned-image data back to the CPB.
6 The CPB processes the image.
7 The CPB sends the image data to the formatter.
8 The formatter further processes the image data (if required).
9 The image data is then either printed or sent digitally, depending on what the user specified
at the beginning of the process.
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