Flow Of Image Data; Flow Of Image Data During Copying; Local Copying - Canon Image Reader-A1 iR5000i Service Manual

CHAPTER 2 MAIN CONTROLLER

3. Flow of Image Data

3.1 Flow of Image Data During Copying

3.1.1

Local Copying

Local copying occurs when the machine is selected as the printer on its control panel.
Data flows as shown in local copying mode. All data is first written to the hard disk, and
is read and sent to the printer unit page by page until all copying jobs end; in other words,
steps (6) through (10) in the figure are repeated until all jobs are done.
HDD
Compressed
Compressed
2-12 S
System controller PCB
Main memory
Page memory
for reading
(5)
data
(6)
data
Page memory
for printing
Main memory
F02-301-01
COPYRIGHT © 2001 CANON INC.
Image processor
PCB
(2)
Binary
(3)
Binary
(4)
Compressed data
(7)
Compressed data
(8)
Binary data
Compressed data
(9)
Binary data
2000 2000 2000 2000
Reader unit
(1) 8-bit
Read-in image
processing block
Black-and-white
compression
circuit
Compressed
Binary
data
extension circuit
Binary data
Print image
processing block
(10)
Binary data
Printer unit
CANON iR5000i/iR6000i REV.0 JUNE 2001