Canon iR1020 Series, Service Manual

Page: 72 / 304

Chapter 3
3-6
3.2 Basic Sequence
3.2.1 Basic Sequence
0013-1086
iR1020J / iR1024J / iR1020 / iR1024 / iR1024A / iR1024N / iR1024F / iR1024i / iR1024iF
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.
F-3-5
T-3-1
Period Definition Purpose Remarks
WAIT
(wait) From when the power is turned on
until the main motor is turned on and
stopped. The machine's mechanical and electrical
states are checked. A check is made on the presence/absence of a drum unit and
for paper remaining inside the machine. The machine also
shifts the WAIT state when the left door and front cover is
closed while power is on, or after returning from ESS mode.
STBY
(standby) After the end of
WAIT, unit the Start key is pressed. The machine is ready for a print command.
INTR
(initial
rotation) After a press on the Start key, until
the leading edge is detected by the
registration sensor. The machine starts up process conditions and
picks up paper for printing. 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.
PRINT
(print) After the registration sensor detects
the leading edge of paper, until the
delivery sensor detects the trailing
edge of paper. 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.
LSTR
(last
rotation) From when printing ends until the
main
motor stops. The drum surface is made
free of potential and the transfer charging
roller is cleaned. After last rotation, the machine shifts to standby to wait for a
print command, in response to which it immediately shifts to
initial rotation.
Wait Standby Initial rotation Print Last rotation
If a print command is received
during last rotation
If continuous printing is selected
End of printing
Power ON
or
The left cover and front cover
is closed
or
Retur n from ESS mode