Basic Operation Sequences - Canon LBP-1000 Service Manual

CHAPTER 2
B. Basic Operation Sequences
The operation sequences of this printer are controlled by the microprocessor (CPU) on the engine
controller PCB. The purposes of periods from power ON until the main motor stops after the
completion of printing are described below. See the appendix for timing chart.
Period
WAIT (WAIT From the power-ON until the
period) completion of the main motor
initial drive.
STBY From the end of the WAIT
(STANDBY period until the print instruc-
period) tion command is input from the
video controller, or from the end
of the LSTR period until the
print instruction command is
input from the video controller,
or until the power is switched
OFF.
INTR From the input of the print
(INITIAL instruction command from the
ROTATION video controller until the paper
period) reaches the top-of-page sensor.
PRINT From the end of the INTR period
(PRINT until 2 seconds after the top-of-
period) page sensor detects the trailing
edge of the paper.
LSTR (LAST From the completion of printing
ROTATION until the main motor stops
period) rotating.
2 - 2
Table 2-1-1
Purpose
Clears the drum surface
potential and cleans the
transfer charging roller.
Maintains the printer in a ready
state.
Stabilizes the sensitivity of the
photosensitive drum in
preparation for printing.
Forms an image on the
photosensitive drum according
to the VIDEO signal input from
the video controller, and
transfers the toner image to
paper.
Delivers the final page out of
the printer and cleans the
transfer charging roller.
Remark
Detects whether the
cartridge is installed or
not.
On receiving the print
instruction command
from the video
controller, the printer
enters the INITIAL
ROTATION period.