Model K-C3.5L
30
Ricoh Co. Ltd.
http://www.ricoh.com/
Slide 30
Image Processing Circuit
Data comes to the BICU board from three sources.
Scanner and SBU, Fax controller & Printer controller
See the notes section below for more details.
CCD
SBU
SCN
Drum
LSD
LD
Driver
LDD
VCU
FCI
IPU
BICU
PRN
DRAM
Memory
Control
IC
GDI and
GW
Controller
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
Note: The IPU and VCU are contained in the same IC called SCRATCH on the BICU.
Summary of Contents for K-C3.5L
Page 122: ...Model K C3 5L 122 Ricoh Co Ltd http www ricoh com Slide 122 ADF DF2000 No additional notes...
Page 130: ...Model K C3 5L 130 Ricoh Co Ltd http www ricoh com Slide 130 ARDF DF2010 No additional notes...
Page 193: ...Model K C3 5L 193 Ricoh Co Ltd http www ricoh com Slide 193 End of Course...
