Canon CLBP-460PS, Service Manual

Page: 60 / 566

B. Basic Sequence of Operations
The operation sequence for this printer is controlled by the microcomputers on the DC controller
PCB. The periods from the power ON to the end of printing and stop of the main motor are list-
ed below. See the Appendix for timing charts.
Table 2-1-1
2 - 2
CHAPTER 2
Purpose Remark Period
WAIT
(WAIT
period)
STBY
(STANDBY)
INTR
(INITIAL
ROTATIONS
period)
PRINT
(Print)
LSTR
(LAST
ROTATIONS
period)
From power switch ON until the
fixing roller temperature reaches the
target temperature.
From the end of the WAIT period
until a /PRNT signal is input from
the video controller PCB, or from
the end of LSTR period until a
/PRNT signal is input from the video
controller PCB or the power is
switched OFF.
After input of the /PRNT signal from
the video controller until the scanner
motor becomes ready and the home
position of the intermediate transfer
belt reaches the leading edge of the
first color.
From the end of INTR period until
the home position of the intermediate
transfer belt reaches the secondary
transfer start position.
From the end of PRINT period until
the fixing motor stops.
To warm up the fixing rollers
to set the printer in the standby
state.
To hold the fixing rollers at the
target temperature to keep the
printer ready to print when a
/PRINT signal is input.
To stabilize the sensitivity of the
drum for preparation of printing.
To form an image on the photo-
sensitive drum according to the
/VDO0 to /VDO7 signals input
from the video controller PCB,
make it visible with toner, and
transfer the image to the
intermediate transfer belt.
To transfer the toner on the
intermediate transfer belt onto
the paper, deliver the paperout
of the printer, and clean the
intermediate transfer belt.
In this period, the printer
checks for presence
of r e s i d u a l p a p e r a n d
whether units are installed
a n d c o n d u c t s i m a g e
stabilization control.
The scanner motor is
maintained in a ready state
in case of continuous
printing.
The intermediate transfer
belt is cleaned each time
a sheet of paper is printed
on. (During continuous
printing it is also cleaned
in the PRINT period.)