Print; Flow Of Print Jobs - Canon iR5000i Service Manual

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.
PDL PCB
Print data
processing
block
HDD
Network
PCB
PDL data
(1)
COPYRIGHT © 2001 CANON INC.
System controller PCB
Main memory
Image data
(4)
Memory for
development
Main
PDL data
(3)
memory
(7)Compression
data
Page
(8)Compression
memory
data
for printing
(2)PDL data
F02-303-01
2000 2000 2000 2000 CANON iR5000i/iR6000i REV.0 JUNE 2001
CHAPTER 2 MAIN CONTROLLER
Image processor PCB
(5)Image data
(6)Compression
data
(9)Compression
data
(10)Binary data
(11)Binary
data
Print image
processing unit
(12)Image data
Printer unit
Compression
circuit
Extension
circuit
2-17 S