Toshiba e-STUDIO 4500c, Service Manual

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IMAGE PROCESSING August, 2006
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6.6.3 IPU (IMAGE PROCESSING UNIT)
The IPU does the following:
•
Controls the scanner
•
Processes the image signals from the SBU and sends them over the PCI bus to
the controller memory
•
Receives the image processing signals sent over the PCI bus from the controller
memory, processes them, then outputs them to the VGAVD.
•
Outputs the control signals for the ARDF
•
Controls the relay of power and signals
Image processing, ADS (Auto image Density Selection) correction, and line width
correction are done on the BICU board for all the digital data sent from the SBU.
Finally, the processed data is sent to the printer as digital signals (2 bits/pixel).