Canon Image Reader-A1, Service Manual

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COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON iR5000i/iR6000i REV.0 JUNE 2001
CHAPTER 2 MAIN CONTROLLER
2-17 S
3.3 Print
3.3.1 Flow of Print Jobs
A print job from a computer connected to the network flows as follows:
A print job received by the network PCB is first stored on the hard disk in the PDL form,
and is developed into image data (RIP development) in the print data processing circuit on
the PDL PCB; the result is compressed in the compression circuit on the image processor
PCB, and stored on the hard disk.
The data is then read into to the extension circuit of the image processor PCB, and is de-
veloped into image data (decompressed) for transmission to the print image processing
block; it is subjected to smoothing and other processing, and then is printed on the printer
unit. In other words, steps (8) through (12) in the figure are repeated until all jobs are done.
F02-303-01
Print data
processing
block
Print image
processing unit
Network
PCB
PDL PCB
(1)
PDL data
Memory for
development
Page
memory
for printing
Compression
circuit
System controller PCB Image processor PCB
Extension
circuit
Printer unit
(2) PDL data
(3)
PDL data
(7) Compression
data
(8) Compression
data
(9) Compression
data
(10) Binary data
(11) Binary
data
(6) Compression
data
Main
memory
(4)
Image data
Main memory
(12) Image data
(5) Image data
HDD