Image Processing - Ricoh B039 Service Manual

IMAGE PROCESSING

6.5 IMAGE PROCESSING
6.5.1 OVERVIEW
SBU
Optional
M e m o r y
L S D
D R A M
Control
D R A M
IC
IMB
V C U
D r u m
IPU
L D
Fax Controller
Driver
FCI
Printer Controller
LDD BiCU
B039D002.WMF
The CCD generates an analog video signal. The SBU (Sensor Board Unit)
converts the analog signal to a 6-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 γ correction, ID γ correction
• VCU: Printer γ 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 on the BiCU
Finally, the BiCU board sends the video data to the LD drive board at the proper
time. The IMB provides memory for the copier features (the B039 model outside N.
America does not have the IMB as standard equipment). In addition, optional
DRAM can be added to the IMB (☛ 6.5.5).
SM 6-13 B039/B040/B043