Canon MF4500 Series, Service Manual

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Technical Overview > Basic Configuration > Basic Sequence > Basic Sequence of Operation
Technical Overview > Basic Configuration > Basic Sequence > Basic Sequence of Operation
Basic Configuration
Configuration function
The machine may be broadly divided into the following 7 functional blocks: engine control
system, document exposure/feeding system, laser exposure system, image formation system,
pickup/transport/delivery system, fixing system, and externals/auxiliary control system.
Document exposure
/Feeding system
External device
Engine control
system
Laser exposure system
Pickup/transport/delivery system
Image formation system
Fixing system
Externals and control system
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Basic Sequence
■ Basic Sequence of Operation
The engine controller controls the operation sequence. The following table provides an outline
of machine operation occurring from when the power switch is turned on to when printing
ends and motors stop, indicating the purposes of intervals and engine operation. For details
of various loads, see the timing chart.
Interval Purpose Remarks
WAIT
(Wait) From power-ON until initial
drive for main motor is
completed.
To clear potential from the drum
surface and to clean the transfer
roller.
Also to bring the heater
temperature up to the targeted
temperature.
Detect whether the
Toner cartridge is
installed or not.
STBY
(Standby) From the end of the WAIT
period or the LSTR period
until the print command is
sent from the main controller.
Or, from the end of the LSTR
period until power switch is
turned OFF.
To keep the printer ready to
print.
INTR
(initial
rotation) From the input of the print
command from the main
controller until the pick-up
solenoid is turned ON.
To stabilize the photosensitive
drum sensitivity in preparation
for printing. Also to clean the
transfer roller.
PRINT
(print) From the end of the INTR
period until the top of page
sensor detects the trailing
edge of paper.
To form image on the
photosensitive drum based
on the VIDEO (/VD01, /VD02,
VD01, VD02) signals input
from the main controller, and to
transfer the toner image onto
paper.
LSTR
(last
rotation) From the end of PRINT
period until the Main motor
stops.
To deliver the last paper
completely out of the printer.
Return to the INTR
period as soon as
another print command
is sent from the main
controller.
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