Sharp AR-C150 (serv.man5) Service Manual ▷ View online
4. Scanner (writing) section
A. Outline
This section performs the following functions and operations.
There are four scanners (writing); yellow, magenta, cyan, and black.
Each scanner (writing) unit converts the dot image data of Y, M, C,
and K outputted from the ICU PWB into laser beams, and scans to
form latent electrostatic images on the OPC drum.
and K outputted from the ICU PWB into laser beams, and scans to
form latent electrostatic images on the OPC drum.
Since the position of each scanner of C, Y, M, and K is shifted to the
paper transport direction, the timing of the above operation differs de-
pending on the position.
paper transport direction, the timing of the above operation differs de-
pending on the position.
B. Major parts functions and operations
CONVERT IMAGE DATA TO
LASER BEARM(Y)
LSU UNIT(Y)
CONVERT IMAGE DATA TO
LASER BEARM(M)
CONVERT IMAGE DATA TO
LASER BEARM(C)
CONVERT IMAGE DATA TO
LASER BEARM(K)
LASER DIODE
SCANNING MOTOR
SCANNING MIRROR
LSU UNIT(M)
SCANNING MOTOR
SCANNING MIRROR
LSU UNIT(C)
LASER DIODE
SCANNING MOTOR
SCANNING MIRROR
LSU UNIT(K)
LASER DIODE
SCANNING MOTOR
SCANNING MIRROR
LASER DIODE
ICU
MAIN
PWB
LSU SECTION
CN503
(28pin)
CN505
(26pin)
CN702
(40pin)
DCPS
LSU K
DSFW (+5V)
LSU Y
LSU M
LSU C
CN108
(14pin)
PCU
PWB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
18
17
16
AR-C150
2 – 19
No.
Parts
Note
Code
Signal
name
Name
Type
Function/Operation
Active
condition
1
Y-LSU unit
Converts yellow components of image signals sent
from the ICU PWB into laser beams to reflect onto
the OPC drum.
from the ICU PWB into laser beams to reflect onto
the OPC drum.
2
M-LSU unit
Converts magenta components of image signals
sent from the ICU PWB into laser beams to reflect
onto the OPC drum.
sent from the ICU PWB into laser beams to reflect
onto the OPC drum.
3
C-LSU unit
Converts cyan components of image signals sent
from the ICU PWB into laser beams to reflect onto
the OPC drum.
from the ICU PWB into laser beams to reflect onto
the OPC drum.
4
K-LSU unit
Converts black components of image signals sent
from the ICU PWB into laser beams to reflect onto
the OPC drum.
from the ICU PWB into laser beams to reflect onto
the OPC drum.
5
Laser diode
(integrated with the
control PWB)
(integrated with the
control PWB)
Generates laser beams. (Controls ON/OFF for
forming images and PWM modulation.)
forming images and PWM modulation.)
6
No. 1 cylindrical
lens
lens
Laser beam convergence and position correction
7
No. 1 mirror
Passes laser beams to No. 2 mirror.
8
No. 2 mirror
Passes laser beams to the scanning mirror.
9
Filter glass
Prevent dust from attaching to the scanning mirror.
10
Scanning mirror
Scans laser beams and forms images.
11
No. 1 f
θ
lens
Corrects the shape and the pitch of laser beams.
12
No. 3 mirror
Passes laser beams to No. 2 f
θ
mirror
13
No. 2 f
θ
mirror
Corrects the shape and the pitch of laser beams.
14
No. 4 mirror
Passes laser beams to the cylindrical mirror.
15
Cylindrical mirror
Passes laser beams to the OPC drum./Performs
jitter correction in the sub scanning direction.
jitter correction in the sub scanning direction.
16
Sensor lens
Converges laser beams and passes to the laser
beam sensor.
beam sensor.
17
SYNC
SYNC IN
Laser beam sensor
Photo
diode
diode
Detects the laser beam position. The left image print
start position is controlled by this sensor signal.
start position is controlled by this sensor signal.
18
Filter glass
Prevents dusts from entering the scanner unit.
C. Details of operation
(1) The dot image data are converted into laser beams
by the laser diode.
Video data of Y/M/C/K outputted from the control PWB are converted
into laser beams by the control PWB in the scanner unit.
into laser beams by the control PWB in the scanner unit.
256 (64) gradations are expressed by controlling the duty of the laser
diode drive signal for each dot (pixel) in 256 (64) steps.
diode drive signal for each dot (pixel) in 256 (64) steps.
(2) Laser beams are scanner.
The generated laser beams are passed to the scanning mirror by the
mirror. The laser beams are reflected on the rotating mirror to be
scanned. The scanning mirror has six surfaces, which form photo im-
ages of six lines by one rotation.
mirror. The laser beams are reflected on the rotating mirror to be
scanned. The scanning mirror has six surfaces, which form photo im-
ages of six lines by one rotation.
(3) Laser beam correction
The laser beam pitch of the beams scanned by the scanning mirror
differs at the center and at both ends.
differs at the center and at both ends.
The difference is corrected by two f
θ
lenses.
The six surfaces of the scanning mirror have alight variations in the
surface angle, which is corrected by the cylindrical lens.
surface angle, which is corrected by the cylindrical lens.
Without this correction, jitters would be generated in the scan line
pitch.
pitch.
(4) Laser beam position detection
The laser beam position is detected by the laser beam sensor, and
the signal is used as the horizontal sync signal (SYNC).
the signal is used as the horizontal sync signal (SYNC).
This signal is used to control the image position in the main scanning
direction.
direction.
(5) Others
The four scanner (writing) units of yellow, magenta, cyan, and black
are controlled by the ICU MAIN PWB.
are controlled by the ICU MAIN PWB.
LASER ON DUTY AND LASER DOT SIZE
Laser ON duty
Laser dot size
1
255
AR-C150
2 – 20
5. Image forming section
A. Outline
In this section, the laser beam images formed by the scanner (writing)
unit are formed into visible images on the paper with toner.
unit are formed into visible images on the paper with toner.
The above operation is composed of charging, exposure, develop-
ment, transfer, separation, and discharging.
ment, transfer, separation, and discharging.
This section is largely divided into the following sections:
•
OPC drum section (Composed of four units of Y, M, C, and K.)
•
Toner hopper section
•
Development section (Composed of four units of Y, M, C, and K.)
•
Transfer section
•
Waste toner collection section
B. Operations of OPC drum section
(1) Operations of the OPC drum section
(composed offour units of Y/M/C/K) (Formation of
latent electrostatic images)
latent electrostatic images)
a. Outline
After the OPC drum surface is charged negatively by the main
charger, laser beam image lights are radiated to the OPC drum sur-
face by the scanner (writing) unit to form latent electrostatic images.
charger, laser beam image lights are radiated to the OPC drum sur-
face by the scanner (writing) unit to form latent electrostatic images.
PRODUCE ELECTROSTAIC
LATENT IMAGE(Y)
DISCHARGE
CHARGE
CLEANING
MAIN CHARGER
UNIT
DISCHARGE LAMP
CLEANING BLADE
PRODUCE ELECTROSTAIC
PHOTOCONDUCTOR
DRUM(Y)
DISCHARGE
MAIN CHARGER
UNIT
DISCHARGE
LAMP
PHOTOCONDUCTOR
1
1
DRUM MOTOR
DRUM MOTOR
5
5
PRODUCE ELECTROSTAIC
LATENT IMAGE(C)
PRODUCE ELECTROSTAIC
LATENT IMAGE(C)
DISCHARGE
CHARGE
CLEANING
MAIN CHARGER
UNIT
DISCHARGE LAMP
CLEANING BLADE
PHOTOCONDUCTOR
DRUM(M)
DISCHARGE
CHARGE
CLEANING
MAIN CHARGER
UNIT
DISCHARGE LAMP
CLEANING BLADE
PHOTOCONDUCTOR
DRUM(K)
1
1
DRUM MOTOR
DRUM MOTOR
5
5
DRUM MOTOR
CHARGE
CLEANING
MAIN CHARGER
UNIT
CLEANING
BLADE
PHOTOCONDUCTOR
DRUM(M)
PRODUCE ELECTROSTAIC
LATENT IMAGE(M)
DISCHARGE
LAMP
DISCHARGE
AR-C150
2 – 21
b. Major parts functions and operations
No.
Parts
Note
Code
Signal
name
Name
Type
Function/Operation
Active
condition
1
OPC drum unit (Y)
Forms yellow latent electrostatic images.
2
OPC drum unit (M)
Forms magenta latent electrostatic images.
3
OPC drum unit (C)
Forms cyan latent electrostatic images.
4
OPC drum unit (K)
Forms black latent electrostatic images.
5
DL
DL
Discharge lamp
Discharges electric charges on the OPC drum.
6
OPC drum
Forms latent electrostatic images.
7
Cleaning blade
Cleans residual toner from the OPC drum.
8
Waste toner transport screw
Discharges waste toner from the OPC drum unit.
9
Shutter spring
Spring for the shutter
10
Shutter
Prevents toner from dispersing.
11
Toner seal
Shields toner to prevent against leakage.
PCU
PWB
DCPS
CN111
(34pin)
CN104
(28pin)
CN105
(8pin)
CN702
(40pin)
DM
DRIVER
PWB
PHOTO CONDUCTOR DRAM DRIVE SECTION
DVKM
CN1
(10pin)
CN2
(6pin)
CN3
(6pin)
CN4
(6pin)
CN5
(6pin)
CN1
(10pin)
DVCM
DMK
DMC
DMM
DMY
PCU
PWB
PCU
SUB
PWB
PROCESS SECTION
CN111
(34pin)
CN104
(28pin)
CN401
(6pin)
CN111
(34pin)
CN104
(28pin)
CNB
(8pin)
CN702
(40pin)
DCPS
HV PWB
(TC)
BELT UNIT
HV PWB
(MC)
TC K
MC HOLDER UNIT
MC
PWB
MC K
TC C
TC M
TC M
TC Y
OZFM
LSUFM
VFM
TFD
WASTE TONER UNIT
VENTILATION
FAN DUCT UNIT
GB K
DV Bias K
MC C
GB C
GB C
DV Bias C
MC M
GB M
GB M
DV Bias M
MC Y
GB Y
GB Y
DV Bias Y
1
5
8
7
11
2
3
4
6
9
10
6
7
5
8
11
AR-C150
2 – 22
Click on the first or last page to see other AR-C150 (serv.man5) service manuals if exist.