Basic Sequence - Canon LASER CLASS 810 Service Manual

Chapter 3

3.2 Basic Sequence

3.2.1 Basic Sequence
The machine's sequence of operation is controlled by the CPU on the image processor PCB and the CPU on the DC controller PCB.
The following figure shows the sequential flow, and table provides descriptions of the periods involved.
Power ON
or
The left cover is closed
or
Return from ESS mode
Wait
Period Definition
WAIT From when the power is turned on
(wait) until the main motor is turned on and
stopped.
STBY After the end of
(standby) WAIT, unit the Start key is pressed.
INTR After a press on the Start key, until
(initial the leading edge is detected by the
rotation) paper leading edge sensor.
PRINT After the registration sensor detects
(print) the leading edge of paper, until the
delivery sensor detects the trailing
edge of paper.
LSTR From when printing ends until the
(last main
rotation) motor stops.
3-6
End of printing
Standby Initial rotation
F-3-5
T-3-1
Purpose
The machine's mechanical and electrical
states are checked.
The machine is ready for a print command.
The machine starts up process conditions and
picks up paper for printing.
The DC controller PCB generates the BD0*
signal, and the image processor PCB sends
VD0* signal and VD0 signal, thereby
forming a latent image on the photosensitive
drum and turning it into a toner image.
The drum surface is made
free of potential and the transfer charging
roller is cleaned.
If a print command is received
during last rotation
Print
If continuous printing is selected
Remarks
A check is made on the presence/absence of a cartridge and
for paper remaining inside the machine. The machine also
shifts the WAIT state when the left cover is closed while
power is on, or after returning from ESS mode.
The fixing heater is subjected to temperature contro (start-up
temperature control, paper passage temperature control);
scanner rotation speed adjustment and ATVC control are
executed.
After last rotation, the machine shifts to standby to wait for a
print command, in response to which it immediately shifts to
initial rotation.
0016-7920
Last rotation