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B245/B276/B277/B268/B269 Service Manual
Image Processing
Overview
The CCD generates an analog video signal. The SBU (Sensor Board Unit) converts the
analog signal to an 8-bit digital signal, then it sends the digital signal to the BICU board.
The BICU board can be divided into three image-processing blocks: the IPU (Image
Processing Unit), FCI (Fine Character Image), and VCU (Video Control Unit).
IPU: Auto shading, filtering, magnification, scanner gamma correction, ID gamma
correction
VCU: Printer gamma correction, LD print timing control and laser power PWM control
FCI (inside the VCU): Smoothing
The IPU and VCU are contained in the same IC called SCRATCH on the BICU.
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