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2.1 Functional Configuration
2.1.1 Outline
The machine may be broadly divided into the following 6 functional blocks: engine control system, laser exposure system, image formation system, pickup/trans-
port/delivery system, fixing system, and externals/auxiliary control system.
2.2 Basic Sequense
2.2.1 Basic Operation Sequence
The operational sequences are controlled by the microprocessor on the engine controller PCB.
The table below describes the purposes of each period, from the power switch is turned ON until the print operation is completed, and the main motor stops. See
the appendix for detailed timing chart.
WAIT
(WAIT period)
STBY
(STANDBY)
INTR
(INITIAL ROTATION
period)
PRINT
(Print)
LSTR
(LAST ROTATION period)
2.2.2 Power-on sequence
The sequence from when the power switch is turned ON until it gets the STBY status is described in the following.
1) Power ON
2) CPU initialization
3) Video interface communication start
4) Residual paper in the printer check
Check each sensor in the printer for any residual paper
5) Main motor initial drive
6) Fixing heater initial drive
Drive the fixing heater to reach the targeted temperature of 100 deg C
7) Scanner motor initial drive
8) High-voltage control
Detect the presence of cartridge and clean the transfer charging roller after the primary charging AC bias is turned ON
9) Failure/Abnormality check
Detect the scanner failure, the fixing unit failure, and the door open during this period
10) Memory tag communication
Engine control
system
To external device
Period
From the power switch is turned ON until the
main motor initial drive is completed.
From the end of the WAIT period or the
LSTR period until the pick-up command is
input from the video controller. Or from the
end of the LSTR period until the power
switch is turned OFF.
From the print command is input from the
video controller until the pick-up solenoid is
turned ON.
From the end of the INTR period until the
primary high-voltage is turned OFF.
From the primary high-voltage is turned OFF
until the main motor stops.
Laser exposure system
Image formation system
Pickup/transport/delivery system
Fixing system
Externals and control system
F-2-1
T-2-1
Purpose
To clear the potential of drum surface and
to clean the transfer charging roller.
To keep the printer ready to print.
To stabilize the photosensitive drum
sensitivity for preparation of printing.
To form the image on the photosensitive
drum according to the VIDEO signals (/
VD01, VD01, /VD02, VD02) input from
the video controller and transfer the toner
image onto the print paper.
To deliver the last print paper completely
out and clean the transfer charging roller.
Remarks
Detect the presence of cartridge.
When the pick-up command is input from
the video controller, the INTR period
starts right after the LSTR period is
completed.
Chapter 2
0011-2515
0011-2425
0011-2428
2-1
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