Basic Operation Sequences - Canon LBP 2460 - B/W Laser Printer Service Manual

CHAPTER 2
B. Basic operation sequences
Operation sequences of the printer are controlled by the microcomputer on the DC controller
PCB. Descriptions of each period from ON until the main motor stops are as shown below. See
the appendix for timing chart.
Period
WAIT
From power-ON until the fixing
roller temperature reaches 170˚C .
(WAIT
(Less than 80 sec.)
period)
STBY
From the end of the WAIT period
(STANDBY)
until a /PRNT signal is input from
the video controller, or from the
end of the LSTR period until a
/PRNT signal is input from the
video controller or until the power
is switched OFF.
INTR After the /PRNT signal has been
(INITIAL input from the video controller
ROTATIONS until the scanner motor becomes
period) ready (about 7 seconds).
From the end of the INTR period
PRINT
until the primary DC voltage
(Print)
switches OFF.
LSTR After the primary DC voltage turns
(LAST
OFF until the main motor stops.
ROTATIONS
period)
2 - 2
Table 2-1-1
Purpose
Warms up the fixing rollers to
put the printer in the standby
mode. Cleans the transfer
charging roller.
Maintains the printing
temperature of the fixing roller
so that the printer is ready to
print.
To stabilize the sensitivity of
the drum in preparation for
printing and to clean the
transfer charging roller.
To form an image on the
photosensitive drum according
to the VDO signal input from
the video controller and to
transfer the image to paper.
To deliver the final page and
to clean the transfer charging
roller.
Remark
During this period, the
printer checks if the car-
tridge is installed and if
there is toner in it.
If the printer stays in the
standby mode for longer
than five hours, it drives
the main motor for one
second to rotate the
fixing roller, to prevent it
from deforming.
During this period, the
printer maintains the
printing temperature of
the fixing rollers.
If a /PRNT signal is input
from the video controller,
the INITIAL ROTATIONS
period begins
immediately.