Sharp AR-203 (serv.man5) Service Manual ▷ View online
AR-203E/5420/M200/M201 OPERATIONAL DESCRIPTIONS 7 - 1
[7] OPERATIONAL DESCRIPTIONS
1. Outline of operation
The outline of operation is described referring to the basic configuration.
(Basic configuration)
(Outline of copy operation)
Setting conditions
1) Set copy conditions such as the copy quantity and the copy
density with the operation section, and press the COPY but-
ton. The information on copy conditions is sent to the MCU.
ton. The information on copy conditions is sent to the MCU.
Image scanning
2) When the COPY button is pressed, the scanner section starts
scanning of images.
The light from the copy lamp is reflected by the document and
passed through the lens to the CCD.
The light from the copy lamp is reflected by the document and
passed through the lens to the CCD.
Photo signal/Electric signal conversion
3) The image is converted into electrical signals by the CCD cir-
cuit and passed to the MCU.
Image process
4) The document image signal sent from the CCD circuit is pro-
cessed under the revised conditions and sent to the LSU
(laser unit) as print data.
(laser unit) as print data.
Electric signal/Photo signal (laser beam) conversion
5) The LSU emits laser beams according to the print data.
(Electrical signals are converted into photo signals.)
6) The laser beams are radiated through the polygon mirror and
various lenses to the OPC drum.
Printing
7) Electrostatic latent images are formed on the OPC drum
according to the laser beams, and the latent images are devel-
oped to be visible images (toner images).
oped to be visible images (toner images).
8) Meanwhile the paper is fed to the image transfer section in
synchronization with the image lead edge.
9) After the transfer of toner images onto the paper, the toner
images are fused to the paper by the fusing section. The cop-
ied paper is discharged onto the exit tray.
ied paper is discharged onto the exit tray.
(Outline of printer operation)
The print data sent from the PC are passed through the NIC PWB
(in case of network connection) and the MCU to the LSU. The pro-
cedures after that are the same as above 5) and later.
(in case of network connection) and the MCU to the LSU. The pro-
cedures after that are the same as above 5) and later.
(Outline of scanner operation)
The scan data are passed through the MCU to the PC according
to the conditions requested by the operations with the operation
panel.
to the conditions requested by the operations with the operation
panel.
Operation
section
Scanner section
CCD
MCU (Main control/image process section)
Printer/
Scanner I/F
Scanner I/F
USB
USB
USB
PC
Laser beam
Paper exit
Fusing section
Paper transport section
Manual paper
feed section
Cassette paper
feed section
Printer section
LSU (Laser unit)
Laser diode, Polygon mirror lens
Laser diode, Polygon mirror lens
Process section
FAX modem
FAX
(Option)
(Option)
Network
FAX I/F
Network
Box
Box
AR-M200/M201
AR-203E/M200/M201
AR-203E/5420/M200/M201 OPERATIONAL DESCRIPTIONS 7 - 2
2. Scanner section
A. Scanner unit
The scanner unit in the digital copier scans images.
It is composed of the optical unit and the drive unit. The optical unit
performs scanning in the main scan direction with the light receiv-
ing elements (color CCD). The drive unit performs scanning in the
sub scanning direction by moving the optical unit.
performs scanning in the main scan direction with the light receiv-
ing elements (color CCD). The drive unit performs scanning in the
sub scanning direction by moving the optical unit.
B. Optical system
Two white lamps are used as the light source.
Light radiated from the light source is applied to the document on
the document table. The reflected light from the document is
reflected 4 times by No. 1 - No. 3 mirrors and passed through the
reduction lens to form images on the light-receiving surface of 3-
line CCD.
the document table. The reflected light from the document is
reflected 4 times by No. 1 - No. 3 mirrors and passed through the
reduction lens to form images on the light-receiving surface of 3-
line CCD.
The light-receiving surface of the color CCD is provided with 3 line
scanning sections for RGB. Separate images scanned in each
color section are overlapped to complete color scanning. (When
PC scanning)
scanning sections for RGB. Separate images scanned in each
color section are overlapped to complete color scanning. (When
PC scanning)
The resolution is 600dpi.
When copying, only the green component is used to print with the
printer.
printer.
The color component for printing can be switched to red or blue by
the service simulation.
the service simulation.
(Spectrum characteristics of the lamp)
(Spectrum characteristics of the color CCD)
(Optical unit)
C. Drive system
The drive system is composed of the scanner motor, the pulley
gear, the idle pulley, the idle gear, the belt 473, the belt 190, and the
shaft.
gear, the idle pulley, the idle gear, the belt 473, the belt 190, and the
shaft.
The motor rotation is converted into reciprocated movements of the
belt 473 through the idle gear, the pulley gear, the belt 190, and the
idle pulley to drive the optical unit.
belt 473 through the idle gear, the pulley gear, the belt 190, and the
idle pulley to drive the optical unit.
100
75
50
45.4
100.0
50.2
25
380
480
580
680
780
Wavelength [nm]
Sensitivity
1
Table glass
2
Optical unit
3
Lens
4
Mirror 1
5
Mirror 2
6
Mirror 3
7
CCD PWB
8
Lamp
9
Reflector
10
Original
Spectral sensitivity characteristics (Standard characteristics)
Relative sensitivity
Wavelength [nm]
8
9
9
8
10
1
7
5
3
4
2
6
7
9
3
4
6
2
8
5
1
3
1
Scanner motor
2
Pulley gear
3
Idle pulley
4
Belt 473
5
Belt 190
6
Optical unit
7
Shaft
8
Idle gear
9
Table glass
AR-203E/5420/M200/M201 OPERATIONAL DESCRIPTIONS 7 - 3
3. Laser unit
The image data sent from the MCU (image process circuit) is sent
to the LSU (laser unit), where it is converted into laser beams.
to the LSU (laser unit), where it is converted into laser beams.
A. Basic structure
The LSU unit is the writing section of the digital optical system.
The semiconductor laser is used as the light source, and images
are formed on the OPC drum by the polygon mirror and f
are formed on the OPC drum by the polygon mirror and f
θ lens, etc.
The laser beams are passed through the collimator lens, the cylin-
drical lens, the polygon mirror, the f
drical lens, the polygon mirror, the f
θ lens, and the mirror to form
images on the OPC drum in the main scanning direction. The laser
emitting PWB is provided with the APC (auto power control) in
order to eliminate fluctuations in the laser power. The BD PWB
works for measurement of the laser writing start point.
emitting PWB is provided with the APC (auto power control) in
order to eliminate fluctuations in the laser power. The BD PWB
works for measurement of the laser writing start point.
Makes the laser scanning speeds at both ends of the drum same
as each other.
as each other.
B. Laser beam path
C. Composition
Effective scanning width: 216mm (max.)
Resolution: 600dpi
Beam diameter: 75um in the main scanning direction, 80um in the
sub scanning direction
sub scanning direction
Image surface power: 0.18 ± 0.01mW (Laser wavelength 770 -
795nm)
795nm)
Polygon motor section: Brushless motor 20.787rpm
No. of mirror surfaces: 5 surfaces
No. of mirror surfaces: 5 surfaces
4. Fuser section
No
Component
Function
1
Semiconductor laser
Generates laser beams.
2
Collimator lens
Converges laser beams in parallel.
3
Cylinder lens
Takes the focus.
4
Polygon mirror,
polygon motor
polygon motor
Reflects laser beams at a constant
rpm.
rpm.
5
BD (Lens, PWB)
Detects start timing of laser
scanning.
scanning.
6
f
θ lens
Converges laser beams at a spot on
the drum.
the drum.
Makes the laser scanning speeds at
both ends of the drum same as each
other. (Refer to the figure below.)
both ends of the drum same as each
other. (Refer to the figure below.)
2
3
3
6
4
1
5
6
a
≠ b ≠ c
a
b
c
d = e = f
d
e
f
f
θ
LENS
AR-203E/5420/M200/M201 OPERATIONAL DESCRIPTIONS 7 - 4
A. General description
General block diagram (cross section)
Top view
(1)
Heat roller
A Teflon roller is used for the heat roller and a silicone rubber roller
is used for the lower heat roller for better toner fusing performance
and paper separation.
is used for the lower heat roller for better toner fusing performance
and paper separation.
(2)
Separator pawl
Three separator pawls are used on the upper heat roller. The sep-
arator pawls are Teflon coated to reduce friction with the roller and
prevent a smear on the paper caused by the separator pawl.
arator pawls are Teflon coated to reduce friction with the roller and
prevent a smear on the paper caused by the separator pawl.
(3)
Thermal control
1) The heater lamp, thermistor, main PWB, DC power supply
PWB, and triac within the power supply unit are used to control
the temperature in the fuser unit.
To prevent against abnormally high temperature in the fuser
unit, a thermal breaker and thermal fuse are used for safety
purposes.
the temperature in the fuser unit.
To prevent against abnormally high temperature in the fuser
unit, a thermal breaker and thermal fuse are used for safety
purposes.
2) The surface temperature of the upper heat roller is set to 160 -
200°C. The surface temperature during the power save mode
is set to 100°C.
is set to 100°C.
3) The self-check function comes active when one of the follow-
ing malfunctions occurs, and an "H" is displayed on the multi-
copy window.
copy window.
a. When the heat roller surface temperature rises above 240°C.
b. When the heat roller surface temperature drops below 100°C
during the copy cycle.
c. Open thermistor
d. Open thermal fuse
e. When the heat roller temperature does not reach 190°C within
27 second after supplying the power.
(4) Fusing resistor
This model is provided with a fusing resistor in the fusing section
to improve transfer efficiency.
to improve transfer efficiency.
Since the upper heat roller is conductive, when using copy paper
that contains moisture and the distance between the transfer unit
and the fusing unit is short, the transfer current may find a path to
ground via the copy paper, the upper heat roller and the discharg-
ing brush.
that contains moisture and the distance between the transfer unit
and the fusing unit is short, the transfer current may find a path to
ground via the copy paper, the upper heat roller and the discharg-
ing brush.
5. Paper feed section and paper
transport section
A. Paper transport path and general operations
Paper feed is made in two ways; the tray paper feed and the man-
ual paper feed. The tray is of universal-type, and has the capacity
of 250 sheets.
ual paper feed. The tray is of universal-type, and has the capacity
of 250 sheets.
The front loading system allows you to install or remove the tray
from the front cabinet.
from the front cabinet.
The general descriptions on the tray paper feed and the manual
paper feed operation are given below.
paper feed operation are given below.
Separator pawl
Separator pawl
PPD2
Thermal fuse
Thermistor
Heat roller
Paper guide
Pressure roller
Heat roller
Thermistor
Thermal fuse
Heater lamp
Separator pawl
Safety device
(thermal breaker, thermal
fuse)
(thermal breaker, thermal
fuse)
Triac (in the
power supply unit)
power supply unit)
Heated by the heater
lamp. (950W)
The surface temperature
of the upper heat roller is
sensed by the thermistor.
of the upper heat roller is
sensed by the thermistor.
Level of the thermistor is
controlled by the main PWB.
controlled by the main PWB.
With the signal from the
main PWB, the triac is
controlled on and off.
(power supply PWB)
main PWB, the triac is
controlled on and off.
(power supply PWB)
1
Scanner unit
9
Transfer unit
2
Exposure lamp
10
Pickup roller
3
LSU (Laser unit)
11
Manual paper feed tray
4
Paper exit roller
12
Manual paper feed roller
5
Main charger
13
PS roller unit
6
Heat roller
14
Paper feed roller
7
Pressure roller
15
Paper transport roller
8
Drum
16
Shifter roller
6
7
8
9
10
11
12
14 13
4
16
15
1
2
5
3
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