New Functions - Canon iR2200 Service Manual

CHAPTER 2 MAIN CONTROLLER

5 New Functions

5.1 Hard Disk Spool
In hard disk spool, print data is not directly sent to memory for printing, but spooled on
the HDD before printing, thus releasing the application program running on the host PC
sooner than otherwise.
When this function is used, a print job from the PC is stored in the spool area of the
HDD. (The spool area is as large as about 300 MB.) Once spooled, the jobs are then sent to
the RIP processing block in the order they have been received.
The jobs are removed from the spool as they are printed, and as many as 100 jobs may be
spooled at a time.
The following diagram shows the flow of data, from spooling on the HDD to execution:
HDD
Spool area
job 1
job 2
job n
Network PCB
PDL data
(1)
2-18 S
COPYRIGHT © 2001 CANON INC.
PDL data
(3)
Binary data
(7)
Print
buffer
area
Binary data
(8)
PDL data
(2)
F02-501-01
2000 2000 2000 2000
Main controller PCB
Image data
(4)
RIP
processing
block
Image data
(5)
Compression data
(6)
Binary data
(9)
Page
memory
for printing
Binary data
(10)
Print image
processing block
Binary data
(11)
Image date
(12)
Printer unit
CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001
Memory for
development
Compression
circuit
De-compression
circuit