Canon LBP1760P, Service Manual

Page: 40 / 394

B. Basic Operation Sequences
The operation sequences of this printer are controlled by the microprocessor on the engine con-
troller PCB. The purposes of periods from power ON until the main motor stops after the com-
pletion of printing are described below. See the appendix for timing chart.
Table 2-1-1
2 - 2
CHAPTER 2
Purposes Remarks
WAIT (WAIT
period)
STBY
(STANDBY)
INTR
(INITIAL
ROTATION
period)
PRINT
(Print)
LSTR (LAST
ROTATION
period)
From power ON until the main
motor completes the initial
drive.
From the end of the WAIT
period until the /PRINT signal
is input from the video
controller, or from the end of
the LSTR period until the
/PRNT signal is input from the
video controller or until the
power is switched OFF.
After the /PRNT signal is input
from the video controller until
the engine controller outputs
the /TOP signal.
From the end of the INTR period
until the top of page sensor
detects the trailing edge of the
paper.
After the primary DC voltage
turns OFF until the main motor
stops.
Periods
Clears the drum surface
potential and cleans the
transfer charging roller.
Maintains printer in ready
mode.
Stabilizes the sensitivity of the
photosensitive drum in
preparation for printing.
Forms an image on the
photosensitive drum according
to the /VDO signal input from
the video controller, and
transfers the image to paper.
Delivers the final page and
cleans the transfer charging
roller.
During this period, the
printer checks the toner
level and whether the
cartridge is installed or
not.
During this period, the
printer checks the toner
level.
As soon as the /PRNT
signal is input from the
video controller, the
printer enters the
INITIAL ROTATION
period.