Sharp Printer AL 800 User Manual

SERVICE MANUAL  
CODE: 00ZAL840//B1E  
BASIC MANUAL  
DIGITAL COPIER  
MODEL AL-800/840  
CONTENTS  
[ 1 ] OPERATING PRINCIPLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1  
2. Outline of operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3  
A. Paper feed, paper transport section . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5  
C. Scanner (writing) section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12  
E. Fusing/paper exit section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25  
F. Drive section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27  
G. Electrical section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28  
Parts marked with "!" is important for maintaining the safety of the set. Be sure to replace these parts with specified  
ones for maintaining the safety and performance of the set.  
This document has been published to be used  
for after sales service only.  
The contents are subject to change without notice.  
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SHARP CORPORATION  
1. Block diagram  
SCANNER (READING) SECTION  
Control signal, detection signal,  
drive signal, control data line  
DOCUMENT  
LENS  
COPY LAMP  
Image data signal line  
SCANNER  
MOTOR  
MIRROR  
CCD  
LIGHT QUANTITY  
SENSOR  
SCANNER HOME  
POSITION  
Image (light)  
SENSOR  
Power line  
COPY LAMP  
CONTROL PWB  
A/D  
ONVERTOR  
OPERATION PWB  
LAMP (LED)  
CPU  
ASIC  
MEMORY  
ICU PWB  
HOST(PC)  
KEY  
ASIC  
MEMORY  
FAN MOTOR  
SCANNER (WRITE) SECTION  
MCU (PCU) PWB  
LASER  
DIODO  
LASER BEAM  
SENSER  
MOTOR  
DRIVER  
SCANNER  
MOTOR  
POLYGON  
MIRROR  
MAIN MOTOR  
HIGH VOLTAGE POWER PWB  
FUSING/PAPER EXIT SECTION  
PAPER FEED SECTION  
IMAGE PROCESS SECTION  
PAPER FEED  
ROLLER  
CLUTCH  
PAPER  
FEED  
ROLLER  
TEMPERATURE  
SENSOR  
HEATER LAMP  
MAIN  
CHARGER  
PAPER WIDTH  
DETECTOR  
DEVELOPING  
ROLLER  
PAPER  
ROLLER  
PHOTOCONDUCTOR  
PRESSURE  
ROLLER  
PAPER  
PRINT PWB  
PAPER EMPTY  
DETECTOR  
PAPER  
TRAY  
PAPER  
EXIT  
ROLLER  
SEPARATION  
ELECTRODE  
HEAT  
ROLLER  
TRANSFER  
ROLLER  
PAPER ENTRY  
DETECTOR  
PAPER EXIT  
DETECTOR  
TEMPERATURE  
FUSE  
AC POWER  
POWER PWB  
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2. Outline of operations  
A. Paper path and imaging  
Paper is fed, transported, and discharged through the path indicated  
with the arrow in the figure below.  
1) Paper feed (Paper on the paper tray is fed to the transfer section  
by the paper feed roller.)  
2) Image transfer (The toner image on the photoconductor is trans-  
ferred onto the paper by the transfer roller.)  
3) Fusing (The toner image on the paper is fused by the heat roller  
and the pressure roller.)  
4) Paper exit (The paper is discharged to the paper exit tray by the  
paper exit roller.)  
4
1
3
2
B. Image process and data flow  
(1) Copy mode  
C1) Images scanned by the image sensor (CCD element) is con-  
verted into electrical signals (analog signals) and outputted to  
the MCU PWB. (CCD unit)  
C2) Image data outputted from the scanner (reading) section are  
converted into digital signals. (CCDD0-7)  
C3) Image process (area separation, filter process, gamma correc-  
tion, resolution conversion, zooming) is performed by the ASIC  
and the line memory (SRAM). The dot image data, the resolu-  
tion of which is converted from 400dpi to 600dpi, are sent to  
the data select section. (Image data (LD))  
C4) The data are passed through the data select section to the  
scanner (writing) section. (Image data (V DATA))  
In the multi copy mode, image data of one sheet are stored in  
the DRAM. (Sharp version only)  
1 – 3  
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(2) Printer mode  
P1) Print data (compressed data) are sent from the host. (Image  
data (Data 1 – 8)  
P2) Print data are developed by the ASIC and the line memory and  
converted into the full dot image data and sent to the data  
select section. (Image data)(VIDEO)  
P3) The data are sent through the data select section to the scan-  
ner (writing) section. (image data) (V DATA)  
DATA FLOW DIAGRAM  
P2  
P1  
C2  
C3  
ICU PWB  
(VIDEO)  
ASIC  
I/F  
image data  
image data  
(Data1~8)  
MCU PWB  
CCD PWB  
CCD  
Image process ASIC  
DRAM  
LSU unit  
Laser  
analog  
image data  
image data  
A/D  
(CCDD0~7)  
Data select  
image data(LD)  
Image  
process  
Amplifier  
image data (V DATA)  
(CCD OUT)  
DRAM  
16Mbit  
(SC only) (SC only) (SC only)  
DRAM  
DRAM  
SRAM  
32kbitx8  
SRAM  
32kbitx8  
C1  
16Mbit  
16Mbit  
C4  
P3  
serial data  
(SDATA)  
serial data  
(OP DATA/KIN1/KIN2)  
Operation panel  
CPU  
H8S  
CPU  
BUS  
serial data (EEPD)  
EEPROM  
RAM  
ROM  
1 – 4  
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3. Operations of each section  
A. Paper feed, paper transport section  
(1) Outline  
The paper feed tray contains about 200 (250) sheets of paper.  
The paper is passed to the transfer section by the paper feed roller.  
The paper feed operation is controlled by the paper feed roller clutch  
and the paper feed roller clutch solenoid. The paper feed clutch  
employs the mechanical spring clutch.  
Paper mis-feed and paper jam are detected by the paper empty  
sensor and the paper entry sensor. The paper size (width) is detected  
by the paper size (width) detector to prevent toner from attaching to  
the area over the paper width.  
(2) Major parts  
2)  
3)  
1) PE SENSOR  
9) PAPER SIZE SW  
10)  
11)  
4)  
4)  
5) PUS  
6)  
8)  
6)  
7) PIN SENSOR  
13)  
12)  
13)  
14)  
16)  
16)  
18)  
19)  
15)  
8)  
17)  
12)  
19)  
1 – 5  
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Parts  
Type  
Photo  
transmission  
sensor  
No.  
1
Note  
Code  
Signal name  
Name  
Function/operation  
Active condition  
PE SENSOR PEMP IN  
Paper empty  
detector  
Detects paper on the paper tray. LOW (0V) when  
paper is detected.  
2
3
Paper guide  
Adjust the paper width.  
Paper feed tray  
Sets the print paper. (Capacity:  
XXX sheets)  
4
Paper release  
lever  
Put this lever straight to set  
paper to release paper feed. Put  
this lever down to enable paper  
feed.  
5
6
PUS  
PUS  
Paper feed clutch  
solenoid  
Controls (on/off) the main motor  
drive for the paper feed roller.  
Paper feed  
release lever  
When the paper feed lever is put  
straight, this lever releases  
paper feed solenoid drive. This  
partially reduces stress to the  
paper feed roller clutch in  
removing paper.  
7
PIN SENSOR PIN  
Paper in detector Photo  
sensor  
Detects whether the fed paper is LOW (0V) when  
transmission transported to the transfer  
paper is detected.  
position or not. By the timing of  
this detector signal, the relative  
positions of paper and print  
image are controlled.  
8
9
Paper feed roller  
Feeds paper.  
PAPER SIZE PAPER SIZE Paper width  
Mechanical  
Detects the paper width. This  
switch (Micro signal controls the laser beam  
LOW (0V) when  
the max. width is  
detected.  
SW  
IN  
detector  
switch)  
radiation area.  
10  
11  
12  
13  
Paper pressure  
plate  
Presses paper onto the paper  
feed roller.  
Paper pressure  
spring  
Presses paper onto the paper  
feed roller.  
Paper separator  
Separates paper in paper feed  
operation.  
Paper feed clutch Mechanical  
Controls ON/OFF of the paper  
feed roller. (The paper feed roller  
is driven by the paper feed clutch  
solenoid and the main motor.  
spring type  
clutch  
14  
Paper feed clutch  
lever  
Driven by the paper feed clutch  
solenoid to control ON/OFF of  
the paper feed clutch. Prevents  
against reverse rotation of the  
paper feed roller.  
15  
16  
Paper feed clutch  
joint  
Links the paper feed roller and  
the paper feed roller clutch.  
Paper feed clutch  
sleeve  
Controls ON/OFF of the paper  
feed roller. (The paper feed roller  
is driven by the paper feed clutch  
solenoid and the main motor.)  
17  
Paper feed clutch  
spring  
Transmits the paper feed clutch  
rotation to the paper feed clutch  
sleeve.  
18  
19  
Paper feed clutch  
gear  
Transmits the main motor power  
to the paper reed roller.  
Paper separater  
spring  
Applies a proper pressure to the  
paper separater.  
1 – 6  
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(3) Operation  
a. Block diagram  
MCU(PCU)PWB  
High voltage power PWB  
+24V  
CN805  
1 +24V  
2 PUS  
ASIC  
(IC8)  
Paper pickup  
solenoid  
PUS  
MEN  
CN804  
1
2
3
4
MA  
MMT0  
MMT1  
MA-  
MB  
Motor  
driver  
Main motor  
MB-  
CPU  
(IC5)  
+5V  
PIN  
Paper entry  
roller  
Paper feed  
roller  
+5V  
POUT-  
CN7  
1
2
3
+5V  
Paper exit  
roller  
POUT  
GND  
PD802  
LSU PWB  
+24V  
CN601  
CN9  
PE  
Paper empty  
roller  
PE  
9
PE  
9
b. Operation  
* Paper release lever  
* The main motor is a 4-phase stepping motor of 2-phase excite-  
ment bipolar system, which serves as the drive source of the paper  
feed and transport system.  
(Paper release)  
(Paper fixed)  
* The pickup solenoid operates on 24V and turns ON/OFF paper  
feed operation.  
* The following sensors are used.  
Paper empty sensor (transmission photo transistor):  
It is installed on the LSU PWB and is used to detect whether there is  
paper in the paper feed tray or not.  
Paper entry sensor (Transmission photo transistor):  
This sensor is used to detect the paper feed timing of next paper (in  
pre-feed) and to make synchronization between paper transport and  
image forming on the drum. It is also used to detect a paper jam.  
Paper exit sensor (Transmission photo transistor):  
This sensor is used to detect that paper is discharged.  
It is also used to detect a paper jam.  
The paper release lever is used to fix or release paper. To release  
paper, pull the lever toward you as shown in the figure below. To fix  
paper, push the lever forward. The lever mechanism is as shown  
below.  
1 – 7  
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(Paper release operation)  
(Paper fixing operation)  
Notch  
When the paper release lever is pushed down, the paper release  
lever arm pushes the lock lever arm in the direction of arrow (A).  
Lower frame  
By the above operation, the rotating disk is lifted and the paper is  
pushed by the paper feed roller.  
If printing is made without pushing down the paper release lever, the  
lock lever arm is pushed by the paper feed roller gear boss in the  
direction of arrow (A) and the paper feed tray is pushed to fix the  
paper.  
Lock lever arm  
Lock lever  
Spring  
* Paper feed roller, paper feed solenoid  
Paper feed solenoid  
Paper feed tray  
Paper release lever  
Paper feed roller  
Paper feed clutch  
Paper feed clutch  
Clearance  
The paper feed solenoid is used to turn ON/OFF the paper feed  
clutch. When the paper feed solenoid is turned on, the paper feed  
roller is rotated.  
The lock lever arm is always pressed onto the paper release lever by  
the spring. When the paper release lever is pulled toward you, the  
lock lever arm is brought into contact with the lower frame so that the  
paper pressure plate is fixed at the paper release position. Under this  
condition, a clearance is provided between the paper feed roller and  
the paper feed tray as shown in the figure below, and the paper is  
released.  
ON  
Paper release lever  
Paper feed roller  
Sub release lever  
A
paper feed clutch  
Paper plessure plate  
Lock lever arm  
(A)  
Paper feed roller gear  
The paper feed clutch is a spring clutch. The paper feed roller gear  
rotation is transmitted to the paper feed roller only in the direction of  
(A). That is, the paper feed roller is rotated only in the direction of (A)  
(paper feed direction).  
Paper release lever  
Paper feed clutch  
1 – 8  
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B. Scanner (reading) section  
(1) Outline  
In this section, the copy lamp (Xenon lamp) radiates light onto a  
document, and the reflected light is detected by the image sensor  
(CCD element) to convert into electrical signals (analog signals),  
which are sent to the MCU PWB.  
Paper feed roller  
Separate sheet  
The paper feed roller is of circular form, and double paper feed is  
prevented by the separate sheet.  
Paper feed clutch lever  
Clutch R sleeve  
The paper feed clutch lever is provided to prevent the paper feed  
roller from rotating reversely. When paper feed is not performed, the  
paper feed clutch lever is engaged with the paper feed roller boss  
gear.  
When removing paper for paper replacement, a reverse rotation  
power is applied to the paper feed roller. In this case, the paper feed  
solenoid provides enough power to prevent the paper feed roller from  
rotating reversely, however an excessive stress is applied to the  
spring clutch, which may be damaged. Therefore the paper feed  
clutch lever is used to lock and protect the spring clutch from an  
excessive stress.  
1 – 9  
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(2) Major parts  
10)  
11)  
1)  
2)  
4) MHPS  
6) CCD SENSOR  
8) SL SENSOR  
5)  
3)  
2)  
7)  
OR  
6) CCD SENS  
4) MHPS  
10)  
8) SL SENSOR  
7)  
9)  
11)  
9)  
5)  
3)  
Parts  
Type  
No.  
Note  
Code  
Signal name  
Name  
Function/operation  
Active condition  
1
Scanner lamp  
control PWB  
Drives the scanner lamp.  
Maintains the lamp light quantity  
at a constant level.  
2
3
Scanner drive wire  
Transmits the scanner motor  
power to the scanner unit.  
Scanner motor  
Drives the scanner unit.  
4
MHPS  
MHPS  
Scanner home  
position sensor  
Photo  
Detects the scanner home  
HIGH (5V) when  
the home position  
is detected.  
transmission position. By this signal the image  
sensor  
scanning operation is controlled.  
5
6
Lens  
Transfers the document image to  
CCD.  
CCD  
SENSOR  
CCD OUT  
CCD (Image)  
sensor  
CCD  
Scans the document images  
(photo signals) and converts  
them into electrical signals.  
Digital signal  
(8Bit)  
7
8
Scanner lamp  
Radiates light to the document to  
allow the CCD to scan the  
document images.  
SL SENSOR PDA/PDK  
Scanner lamp light Photo diode Detects the scanner lamp light  
Analog signal  
quantity sensor  
quantity. This signal is inputted to  
the scanner lamp control PWB to  
control the scanner lamp drive  
voltage to maintain a constant  
level of light quantity.  
(0 0.5V)  
9
No. 1 mirror  
No. 2 mirror  
No. 3 mirror  
Leads the document image to  
CCD.  
10  
11  
Leads the document image to  
CCD.  
Leads the document image to  
CCD.  
1 – 10  
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(3) Operation  
a. Wiring diagram  
MCU(PCU) PWB  
IC112  
A/D  
CCDD0  
CCDD1  
CCDD2  
CCDD3  
CCDD4  
CCDD5  
CCDD6  
CCDD7  
GND  
A-GND  
CCDOUT  
A-GND  
A5V  
5V  
12V  
GND  
f1  
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
D-GND  
A-GND  
CCDOUT  
A-GND  
A5V  
5V  
12V  
D-GND  
f1  
ASIC  
IC8  
5V  
5V  
12V  
GND  
f2  
GND  
SH-  
GND  
RS  
GND  
SP  
GND  
CP  
GND  
NC  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
10 D-GND  
11 f2  
12 D-GND  
13 SH-  
14 D-GND  
15 RS  
16 D-GND  
17 SP  
18 D-GND  
19 CP  
20 D-GND  
21 NC  
CCD UNIT  
GND  
22 D-GND  
RAMP UNIT  
CN2  
CFL-H  
CLCNT  
1
2
3
4
5
6
7
FGND  
PDA  
PDK  
INVERTER UNIT  
CFL-L  
CN10  
CN1  
1
2
3
4
24V  
24V  
1
2
3
4
P-GND  
ON/OFF  
PD  
P-GND  
CL-CNT  
CL-IN  
(Not used)  
IC13  
CPU  
IC5  
MRMT0  
MRMT1  
MRMT2  
MRMT3  
MRMT0  
MRMT1  
MRMT2  
MRMT3  
24V-mir  
1
2
3
4
5
SCANER MOTOR  
DRIVER  
24V  
MRPS1  
MRPS2  
1
2
3
GND  
MHPS  
5V  
GND  
MHPS  
5V  
1
2
3
MHPS  
SCANER H.P  
SENSOR  
* Copy lamp  
The copy lamp drive voltage corresponding to the sensor output level  
(CLIN) is outputted.  
A cathode ray tube (Xenon lamp) is used as the light source for  
reading images.  
The copy lamp is driven by the scanner lamp control PWB.  
To maintain the lamp light quantity at constant level, the following  
operations are performed.  
The copy lamp light quantity sensor is provided in the scanner unit to  
detect the copy lamp light quantity.  
1 – 11  
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* CCD unit  
* Scanner home position sensor  
Images (light) is converted into an electrical signal (analog signal) by  
the CCD.  
The scanner home position sensor senses the scanner position. The  
copy image position control is performed by the sensing timing of this  
sensor.  
The image signal read by the CCD is converted into a digital signal b  
the A/D convertor in the MCU PWB and outputted to the ASIC, where  
the image is processed.  
* Zooming  
Zooming is performed by changing the copy magnification ratio in the  
sub scanning direction or changing the scanning speed.  
* Scanner motor  
The scanner unit is driven by the scanner drive motor.  
The copy magnification ratio in the main scanning direction is  
changed by the software in the ASIC.  
C. Scanner (writing) section  
(1) Outline  
In this section, the dot image data sent from the MCU PWB are  
converted into laser beams (ON/OFF), which are scanned to form  
latent electrostatic images on the OPC drum. It is composed of the  
laser beam generating section (where dot image data signals are  
converted into laser beams (ON/OFF)), the laser beam correction  
section, the laser beam scanning section, and the laser beam detect-  
ing section. The major parts and their functions are described in the  
following.  
(2) Block diagram  
Scanning motor drive signal (PMD, PMCLK)  
No. 1  
cylinder  
lens  
VIDEO  
Laser diode  
control circuit  
Laser  
diode  
Collimator  
lens  
MCU  
(PCU)  
No. 2  
reflection mirror  
(curved mirror)  
No. 1  
reflection  
mirror  
SYNC  
Laser beam  
sensor  
Motor  
mirror  
No. 2  
cylinder  
lens  
No. 3  
reflection  
mirror  
Drum  
Signal  
Laser beam  
(3) Major parts  
2)  
1) SYNC  
3)  
8)  
7)  
4)  
5)  
6)  
1 – 12  
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Parts  
Type  
No.  
1
Note  
Code  
Signal name  
SYNC IN  
Name  
Function/operation  
Active condition  
SYNC  
Laser beam sensor Bin diode  
Detects the laser beam position.  
By this signal the left image print  
start position is controlled.  
LOW (0V) when  
laser beam is  
detected.  
2
3
No. 1 mirror  
No. 3 mirror  
Leads the laser beam to the OPC  
drum.  
4
Second cylindrical  
lens  
Corrects the laser beam  
deflection by variations in the  
scanning mirror angle. Corrects  
the optical section dirt.  
5
6
7
8
Fθ mirror (No. 2  
Corrects the laser beam form and  
pitch.  
mirror)  
Scanning mirror  
(rotation mirror)  
Scans the laser beam and  
performs imaging.  
No. 1 cylindrical  
lens  
Adjust the direction of laser beam.  
Laser diode  
Generates laser beam. (Controls  
ON/OFF for imaging)  
(4) Operation  
a. Wiring diagram  
MCU(PCU) PWB  
LSU PWB  
IC603  
Laser beam detection PWB  
(start position detection PWB)  
CPU  
(IC5)  
PMCLK  
SAMP  
+24V  
CN9  
CN603  
3-termina  
regulator  
CN604  
CN601  
+24V  
3
1
1
2
3
4
5
6
7
8
+24V  
1
2
3
4
5
6
7
8
1
2
3
+5VL  
SYNC_  
GND  
1
2
3
+5VL  
SYNC_  
GND  
2
GND  
GND  
VDATA  
SAMP  
SYNC-  
APCSTT  
PMCLK  
PMD-  
VDATA  
SAMP  
SYNC-  
APCSTT  
PMCLK  
PMD-  
ASIC  
(IC8)  
LEND-  
SYNC-  
APCSTT  
CN602  
+24V  
+24V  
3
1
2
4
5
Scanning motor  
PMD-  
PMD-  
+24V  
VSYNC  
PRSTT  
PMCLK  
GND  
Q603  
5
1
CN8  
LD  
/PD  
4
3
GND  
IC601  
IM  
CN203  
VR601  
SDATA  
7
8
ASIC  
LEND  
+5VL  
(IC202)  
PRSTT  
4
5
VSYNC  
SYNC  
3
2
GND  
O/I  
IC603  
I/O  
1
ICU PWB  
b. Operation  
When the laser diode is turned on, 780nm infrared semiconductor  
laser beams are radiated from the laser diode and arranged to be  
parallel beams by the collimeter lens and focused to the photocon-  
ductor drum by No. 1 cylinder lens and sent to the scanning mirror.  
The APC circuit is started by the APCSTT signal sent from the MCU  
(PCU) PWB, and laser diode is turned on/off according to the VIDEO  
signal. (The laser diode is turned on when the VDATA signal is  
HIGH.)  
Rotation of the scanning mirror is controlled by the scanning motor to  
scan laser beams.  
1 – 13  
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The scanning mirror is a 6-surface mirror. Six lines are printed for one  
rotation of the scanning motor. Laser beams reflected by the scan-  
ning mirror are passed to the curved mirror by the No. 1 reflection  
mirror. Before reaching the curved mirror, the laser beams enter the  
laser beam sensor on the start position detection PWB to make  
horizontal synchronization (generating SYNC signal).  
The laser beams from No. 1 reflection mirror are arranged to be  
parallel beams by the curved mirror and passed to No. 3 reflection  
mirror. The laser beams reflected by No. 3 reflection mirror are  
passed through No. 2 cylinder lens to the photoconductor drum.  
No. 2 cylinder lens corrects deflection of laser beams due to varia-  
tions in the duplex scanning mirror installing angle, and leads the  
stable laser beams for each line to the photoconductor drum.  
Part name  
Laser diode  
Function  
The laser power is controlled by the  
APC (Auto Power Control) circuit. In  
addition, the paper empty sensor is  
provided.  
The laser diode radiates 780nm infrared  
semiconductor laser beams under  
control of the laser control PWB.  
Collimator lens  
The collimator lens arranges laser  
beams radiated from the laser diode to  
be parallel beams and converges them  
on the photoconductor drum.  
No. 1 cylindrical lens  
Adjusts the direction of the laser beams.  
Scanning motor/  
Scanning mirror  
Used to rotate the scanning mirror.  
Started by the drive signal (PMD_) from  
the PCU. The RPM is controlled by the  
clock signal (PMCLK_). The motor RPM  
is 11811 RPM.  
The scanning mirror is a6-surface  
mirror, and it reflects laser beams. By  
this operation, 6 lines of printing is made  
for one rotation of the scanning motor.  
No. 1 mirror  
This mirror reflects laser beams to the  
curved mirror.  
Laser beam sensor  
PWB (Start position  
detection PWB)  
Used to detect laser beams to make  
horizontal synchronization.  
The photo sensor on the PWB detects  
laser beams to generate SYNC signal.  
No. 2 mirror (Curved  
mirror)  
Laser beams are scanned by the  
scanning mirror. But the dot interval of  
laser beams radiated onto the  
photoconductor differs at the center and  
at the corners. This mirror corrects this  
difference to provide even dot interval of  
laser beams. For this reason, it is of  
curved structure.  
No. 3 mirror  
This mirror passes the laser beams  
reflected from the curved mirror to the  
photoconductor mirror.  
No. 2 cylindrical lens  
This lens is used to correct laser beam  
deflection due to variations in the  
scanning mirror angle.  
D. Image process section  
(1) Outline  
This section is composed of the photoconductor section, the develop-  
ing section, the transfer/separation section. Images formed by laser  
beams formed by the scanner (Writing) section are converted into a  
latent electrostatic images, which are formed into visible images by  
toner development. The toner images are transferred onto paper.  
1 – 14  
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(2) Image forming process diagram  
Scanning  
Lens  
Laser diode  
High voltage  
circuit  
No. 1 -  
No. 3 mirror  
Main charger  
Exposure  
Toner  
Cleaning, charging  
Development,  
residual toner  
collection  
High voltage  
circuit  
Discharging  
brush  
Discharging  
Development  
roller  
High voltage  
circuit  
Paper exit  
Separation  
Fusing  
Transfer  
Paper feed roller  
Paper tray  
Paper  
Separation  
electrode  
Transfer charger roller  
High voltage circuit  
Heat roller,  
pressure roller  
Heater lamp  
The operation of this section are composed of the six processes:  
charging, exposure, development, transfer, separation, and discharg-  
ing. An OPC drum is used as the photocoductor drum. Toner is of  
one-component. For charging, the rotation brush is used. For trans-  
fer, the roller is used and virtually no generation of ozone. It is also  
compact. The high voltage required in this section is provided by the  
high voltage power PWB.  
1 – 15  
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(3) Major parts  
a. Photoconductor section  
1)  
5)  
6)  
3)  
5)  
4)  
2)  
1)  
Parts  
No.  
Note  
Name  
Type  
Function/operation  
Forms latent electrostatic images.  
1
2
OPC drum  
OPC  
OPC drum earth electrode  
Connects the OPC drum aluminum layer and  
the earth (high voltage PWB).  
3
4
Main charger electrode  
Discharge brush  
Connects the main charger output (high  
voltage PWB) and the main charger brush.  
Discharges (lower the potential of) the OPC  
drum surface.  
Japan only  
5
6
Main charger brush  
Toner seal  
Charges the OPC drum.  
Shield to prevent toner from leaking outside  
the OPC drum unit.  
1 – 16  
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b. Development section  
5)  
2)  
1)  
7) 8) 5)  
1)  
3)  
3)  
6)  
4)  
4)  
8)  
5)  
1)  
Parts  
No.  
Note  
Name  
Type  
Function/operation  
1
Developing roller  
Attaches toner to the latent electrostatic  
images on the OPC drum to convert it into  
a visible image.  
2
3
4
5
6
Developing doctor  
Controls toner quantity on the developing  
roller and charges toner.  
Developing bias  
electrode  
Connects the developing roller and the bias  
voltage output (high voltage PWB).  
Potential control  
electrode  
Connects the developing roller and the bias  
voltage output (high voltage PWB).  
Toner stirring roller  
Lead toner to the developing roller and  
charges toner.  
Zenor diode  
Maintains the potential between the  
developing roller and the toner stirring roller  
at a constant level.  
7
8
Toner seal  
Shields toner from leaking outside the  
developing unit.  
Potential control sheet  
Maintains the developing roller potential at  
a constant level.  
1 – 17  
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c. Transfer/separation section  
1)  
3)  
4)  
3)  
5)  
2)  
1)  
4)  
Parts  
No.  
Note  
Name  
Function/operation  
1
2
Transfer roller  
Transfers toner images on the OPC drum onto the paper.  
Transfer roller  
electrode  
Connects the transfer roller and the transfer voltage output (high voltage PWB).  
3
Pressure spring  
Applies pressure to the transfer roller, paper, and the OPC drum to improve  
transfer efficiency.  
4
5
Separation electrode Reduces paper charging potential to facilitate separation of paper.  
Earth electrode  
Connects the separation electrode and the earth (high voltage PWB).  
1 – 18  
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(4) System diagram  
Laser  
beam  
Scanning mirror  
Laser unit  
MCU PWB  
No. 1 - 4 mirror  
Image data  
Toner  
High voltage power PWB  
310V/+200V  
selection  
DC 310V  
Main  
charger  
brush  
DC-310V  
Developing  
roller  
DC +200V  
Photoconductor drum  
DC +3.5KV  
AC600V(P-P)  
DC-200V  
Discharge  
brush  
DC 850V  
Paper  
Transfer  
charger  
roller  
DC-850V  
AC600V(P-P)  
Separation  
electrode  
DC+500V  
(5) Operation  
a. Wiring diagram  
MCU(PCU) PWB  
CN6  
3
2
1
GND  
TSIN  
TSIN  
+5V  
Toner sensor  
High voltage power PWB  
ASIC  
(IC8)  
Charger brush  
MCON  
Q804  
MC  
CB  
T801  
transformer  
Discharge brush  
OPC drum  
+24VP  
DRUM  
EARTH  
Driver I  
C801  
+24VP  
Separation electrode  
Transfer charger roller  
TC/Bias ON  
Q807  
TC  
Q806  
T802  
transformer  
100V  
Q803  
Q808  
DC  
Bias  
Supply roller  
CPU  
(IC5)  
PWNSIN  
Developing roller  
Earth sheet  
1 – 19  
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b. Major parts functions and operations  
<2> Developing unit  
Visible images are formed with toner over the latent electrostatic  
images formed on the OPC drum surface. Toner is filled in the  
developing unit.  
1) Developing roller  
3)  
The developing roller is made of urethane and it has considerably  
high electrical resistance. It is flexible and pressed onto the OPC  
drum. Toner is attached to the latent electrostatic images on the OPC  
drum to make visible images. A voltage of DC-310V/+200V is applied  
to the developing roller. A voltage of –310V is applied when develop-  
ing. A voltage of +220V is applied when cleaning.  
1)  
11)  
2)  
4)  
10)  
9)  
2) Doctor  
The doctor is pressed onto the developing roller. It adjust the toner  
quantity on the developing roller surface.  
12)  
The doctor is made of a conductive material.  
3) Toner supply roller  
5)  
The toner supply roller transports toner to the developing roller.  
4) Toner stirring plate  
8)  
7)  
6)  
The toner stirring plate stirs toner in the developing unit to transport  
toner to the developing roller smoothly.  
1
2
3
4
Developing  
roller  
5
6
7
8
Toner seal  
9
Discharge  
brush  
5) Toner seal  
The toner seal prevents toner from leaking outside the developing  
unit.  
Doctor  
Transfer  
charger roller  
10 Main charger  
brush  
Toner stirring  
plate  
Separation  
electrode  
11 Toner seal  
6) Discharge (Earth) sheet  
The discharge sheet maintains the developing roller surface potential  
at a constant level.  
Toner supply  
roller  
Phot conductor  
drum  
12 Discharge  
(Earth) sheet  
<3> Transfer charger roller  
<1> Photoconductor drum unit  
The photoconductor surface is charged and latent electrostatic im-  
ages are formed, then visible images are formed with toner.  
The transfer charger roller is made of urethane and its electrical  
resistance is considerably high. It is flexible and pressed onto the  
OPC drum.  
A high voltage of AC600V (P-P) is applied to DC +3500V.  
1) Photoconductor drum  
Paper transported from the paper feed section is charged positively  
and negatively charged toner on the OPC drum are transferred onto  
the paper.  
Latent electrostatic images are formed and visible images are formed  
with toner.  
An OPC (Organic Photo Conductor) drum is used. The OPC drum  
surface is negatively charged by the main charger brush.  
During cleaning, a voltage of –850V is applied.  
<4> Separation electrode  
When laser beams are radiated on the OPC drum, the electric resis-  
tance at the radiated area is reduced to generate an electric charge  
inside the OPC drum. As a result, the charges on the OPC drum are  
removed. This process is used to form latent electrostatic images.  
The separation electrode is connected to the drum earth. This dis-  
charges paper charged positively in the transfer section to reduce  
potential difference with the OPC drum, reducing electrostatic attrac-  
tion power between paper and the OPC drum, facilitating paper  
separation.  
CTL  
(Charge Transfer Layer)  
OPC layer  
<5> High voltage unit  
The high voltage is made by the invertor system, and is supplied to  
the main charger unit, the transfer unit, and the developing roller.  
CGL  
(Charge Generation Layer)  
Aluminum layer  
2) Main charger brush  
The main charger brush charges the OPC drum surface. It is com-  
posed of brush textures and of a roller shape.  
A high voltage of AC 600V (P-P) is applied to DC-850V to charge the  
brush.  
The main charger brush is in contact with the OPC drum. By supply-  
ing electric charges to the OPC drum, the OPC drum is charged to  
about –850V.  
3) Toner seal  
The OPC drum has two toner seals. The toner seals are used to  
prevent residual toner on the OPC drum from leaking outside.  
1 – 20  
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c. Actual image forming process  
Step 2 (Exposure); Laser beam scanning light corresponding to the  
print data is radiated onto the OPC drum.  
Step 1 (Cleaning, charging): Residual toner on the OPC drum is  
stirred and negative charges are dis-  
Positive and negative charges are generated in the CGL of the OPC  
drum which are radiated with laser beams. The positive charges in  
the CGL are moved to the OPC drum surface, and the negative  
charges are moved to the aluminum layer.  
tributed evenly on the OPC drum.  
(The OPC drum is evenly charged.)  
The main charger brush is of roller shape and is rotating.  
Therefore, positive and negative charges are neutralized in the OPC  
drum exposed with laser beams and the aluminum layer, reducing the  
OPC drum surface potential. On the other hand, there is no change in  
the area which is not exposed with laser beams. So the OPC drum  
surface is kept negatively charged to maintain a high potential. As a  
result, latent electrostatic images are formed on the OPC drum.  
The main charger brush stirrs residual toner and paper dust on the  
OPC drum.  
At the same time, a high voltage of AC 600V (P-P) is applied to DC  
–850V and applied to the main charger brush to make electric dis-  
charge between the roller and the OPC drum to form positive and  
negative charges. The negative charges are attracted to the OPC  
drum which is positively charged. And negative charges are evenly  
distributed on the OPC drum. (The OPC drum surface is evenly  
charged.)  
Residual toner and paper dust stirred by the main charger brush are  
distributed evenly on the OPC drum.  
Laser beam  
Main charger brush  
Non-exposure area  
Exposure area  
CTL  
CGL  
Aluminum layer  
(Drum base)  
Residual toner  
AC600V  
(P-P)  
OPC drum  
DC-850V  
Aluminum layer  
(Drum base)  
CTL  
CGL  
CTL  
CGL  
Aluminum layer  
(Drum base)  
1 – 21  
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Step 3 (Development): Toner is attached to the latent electrostatic  
At that time, the potential of the OPC drum surface where there is no  
charge by exposure of laser beams is higher than the developing  
roller potential. On the other hand, there are negative charges in the  
OPC drum surface area which is not exposed to laser beams. When  
that area is brought into contact with the developing roller, if toner is  
attached to the OPC drum,. toner is moved to the developing roller  
which is in a high potential than the OPC drum.  
images formed on the OPC drum.  
As a result, unnecessary toner and paper dust on the OPC drum are  
collected in the developing unit.  
In this operation, toner is moved from the OPC drum to the develop-  
ing roller.  
In cleaning operation mode, DC +200V is applied to the developing  
roller and cleaning capacity is further increased.  
Step 4 (Transfer): Visible images of toner on the OPC drum are  
transferred to the paper.  
:Toner (Negative charge)  
Doctor  
Developing roller  
Toner supply roller  
100V  
OPC drum  
Exposure area  
(Exposed by  
laser beams.)  
Earth sheet  
Aluminum surface  
(Drum base)  
Non-exposure area  
(Not exposed by  
laser beams.)  
CGL  
OPC drum  
CTL  
DC  
+200V  
DC  
-310V  
Aluminum layer  
(Drum base)  
CGL  
CTL  
Paper  
Toner enters between the developing roller and the doctor, and a thin  
layer of toner (a certain fixed amount) is formed on the developing  
roller by a pressure applied to the doctor.  
Toner is negatively charged by friction when passing between the  
developing roller and the doctor.  
When the OPC drum surface area where there is no charges be-  
cause of exposure of laser beams is brought into contact with the  
developing roller, toner is moved from the developing roller to the  
OPC drum surface. The principle of the process is as follows:  
Transfer roller  
A bias voltage of –310V is applied to the developing roller. Toner  
which is charged by potential difference between the bias voltage and  
the OPC drum surface potential is attracted to the OPC drum surface  
(positively charged).  
DC+3500V  
AC600V(P-P)  
DC –850V  
A high voltage of AC60V (P-P) is applied to DC+350V and applied to  
the transfer roller, generating electric discharge between the roller  
and the OPC drum, generating positive and negative charges.  
1 – 22  
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The positive charges are attracted to the OPC drum which is nega-  
tively charged, and put on the paper transported between the transfer  
roller and the OPC drum. The paper, therefore, is charged positively.  
Step 6 (Discharging): The drum surface is discharged by the dis-  
charge brush to facilitate cleaning. (Residual  
toner can be easily collected by the main  
The negative charged toner on the OPC drum is attracted to the  
paper which is positively charged and visible images of toner are  
transferred onto the paper.  
Step 7 (Cleaning): Residual toner on the OPC drum is removed.  
In the cleaning mode, a voltage of –850 V is applied. If there is toner  
Step 5 (Paper separation): Paper is separated from the OPC drum.  
Main charger brush  
Aluminum layer  
(Drum base)  
CGL  
CTL  
AC600V  
(P-P)  
Residual toner  
Paper  
OPC drum  
DC-850V  
Separation  
electrode  
Discharge brush  
Aluminum layer  
(Drum base)  
CTL  
CGL  
Transfer roller  
DC+500V  
An electric force is acting between the paper which is positively  
charged in the transfer process and the OPC drum which is negative-  
ly charged. Positive charges on the paper are moved to the aluminum  
layer through the separation electrode to reduce the potential dif-  
ference between the OPC drum and the paper.  
By this operation, the paper can be easily separated from the OPC  
drum.  
The main charger brush is of roller shape and is rotating.  
The main charger brush stirs residual toner and paper dust on the  
OPC drum. The residual toner and paper dust are evenly distributed  
and put on the OPC drum again to be sent to the developing roller.  
1 – 23  
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d. OPC drum surface potential  
<2> OPC drum surface potential and developing bias  
voltage during developing  
<1> OPC drum surface potential shift in printing  
During developing  
Start  
End  
Laser  
beams  
Dark area  
potential  
Dark area  
potential  
-850V  
-310V  
Developing  
bias  
-310V  
Developing  
bias  
Toner attraction  
potential  
Light area potential  
Time (OPC drum rotating angle)  
Light area potential  
Charging/  
cleaning  
Exposure Residual toner Transfer  
collection/  
Charging  
Development  
Time (OPC drum rotating angle)  
1 – 24  
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E. Fusing/paper exit section  
(1) Outline  
Toner attracted to the paper in the transfer section is fused by heat  
and pressure of the heat roller. The heat roller is of thin aluminum  
roller which is high heat conductivity, minimizing the warm up time.  
The heat roller surface temperature is detected by the fusing  
temperature sensor to maintain the fusing temperature at a constant  
level (160/155 ˚C).  
(2) Major parts  
11)  
7)  
11)  
8)  
9)  
8)  
7)  
1)  
6)  
2) POUT  
3)  
4)  
5)  
4)  
5)  
9)  
10)  
9)  
2) POUT  
10)  
1)  
6)  
11)  
3)  
Parts  
Type  
No.  
1
MODEL  
Note  
Code Signal name  
Name  
Heat roller  
Function/operation  
Heats toner on the paper and LOW (0V) when  
Active condition  
fuses onto the paper.  
paper is  
detected.  
2
3
4
5
6
POUT POUT IN  
RTH IN  
Paper exit detector Photo transmission Detects paper exit.  
sensor  
Fusing temperature Thermistor  
sensor  
Detects the heat roller  
surface temperature.  
Temperature fuse 1 Mold  
(Fusing section)  
Assures safety in overheating.  
Temperature fuse 2 Mold  
(Fusing section)  
Assures safety in overheating.  
Heats the heat roller.  
HL  
Heater lamp  
Halogen lamp  
100V series 10V 500W  
120V series 120V 500W  
200V series 230V 500W  
7
Pressure roller  
Applies a pressure to the  
heat roller and paper to  
improve fusing efficiency.  
8
9
Paper exit roller  
Separation pawl  
Discharges paper after fusing.  
Separates paper from the  
fusing roller mechanically.  
Discharges paper outside the  
machine after fusing.  
10  
11  
Paper exit roller  
Pressure spring  
Applies a pressure to the  
heat roller, paper, and  
pressure roller to improve  
transfer efficiency.  
1 – 25  
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(3) Operation  
a. Wiring diagram  
MCU(PCU) PWB  
POWER SUPPLY PWB  
Fusing section  
AC POWER IN  
Temperature fuse  
(132 C)  
CPU  
(IC5)  
CN603  
1/3 HLL  
HLON  
HLON-  
Gate  
Temperature fuse  
(187 C)  
Heater  
lamp  
RTH  
CN603  
2/4 HLN  
COMP  
PR  
Thermistor  
AMP  
CN2  
1
2
GND  
RTHN  
ASIC  
RTH  
(IC202)  
PR  
CN801  
+24V  
DRIVER  
1
2
+24V  
NC  
High voltage power PWB  
3 +24VS  
b. Operation  
Heat roller:  
The heat roller is made of aluminum  
tube coated with teflon to provide a good  
separation capability.  
The heater lamp ON/OFF is controlled by the detection signal (volt-  
age value) from the thermistor to maintain the heat roller surface  
temperature at the optimum level.  
Heater lamp:  
Pressure roller:  
Thermistor:  
A halogen lamp is used as the heater  
lamp.  
The heat roller surface temperature is controlled to 160/155 ˚C in the  
print mode and to 80 ˚C in the pre-heat mode.  
Silicon rubber is used to provide enough  
pressure.  
As a protective measure in case of abnormally high temperature in  
the fusing section, two temperature fuses are provided in the heater  
lamp power line.  
A chip-type thermistor of good response  
is used to detect the heat roller surface  
temperature.  
The heater lamp is lighted by the AC power source.  
Temperature fuse (132 ˚C): The temperature fuse (132 ˚C) is at-  
tached to the fusing cover. When the  
fusing cover ambient temperature be-  
comes abnormally high, this fuse is  
blown off.  
Temperature fuse (187 ˚C): The temperature fuse (187 ˚C) is closely  
attached to the heat roller. When the  
heat roller temperature becomes abnor-  
mally high, this fuse is blown off.  
Separation pawl:  
The separation pawl separates paper  
from the heat roller mechanically.  
1 – 26  
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F. Drive section  
(1) Outline  
The main motor drives the paper feed section, the transport section,  
the image process section, and the fusing section . The main motor  
drive circuit is built in the high voltage power PWB.  
(2) Major parts  
1)  
3)  
2)  
Parts  
No.  
Note  
Code  
MM  
Name  
Main motor  
Type  
Function, operation  
1
Stepping motor (+24V)  
Drives the paper feed section, the paper  
transport section, the fusing section, and  
the image process section.  
2
3
Paper feed section drive  
gear  
Transmits the main motor power to the  
paper feed section.  
Imaging process/  
fusing section drive gear  
Transmits the main motor power to the  
imaging process section and the fusing  
section.  
(3) Wiring diagram  
MCU(PCU)PWB  
High voltage power PWB  
Paper feed roller  
ASIC  
(IC8)  
MEN  
Heat roller  
Pressure roller  
Main motor  
CN804  
1
2
3
4
MA  
Paper exit roller  
MMT0  
MMT1  
MA-  
MB  
Motor  
driver  
Developing cartridge  
MB-  
CPU  
(IC5)  
Photoconductor cartridge  
Transfer roller  
1 – 27  
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G. Electrical section  
(1) Block diagram  
ICU PWB  
ASIC  
I/F  
MCU (PCU) PWB  
Image process ASIC  
CCD PWB  
CCD  
DRAM  
CCD control  
LSU unit  
Laser  
Data select  
DRAM  
Image  
Amplifier  
A/D  
Laser beam  
sensor  
process  
High voltage  
PWB  
Paper in sensor  
Polygon motor  
Paper exit  
sensor  
SRAM  
32kX8  
SRAM  
32kX8  
DRAM  
16Mbit  
DRAM  
16Mbit 16Mbit  
Pickup solenoid  
Main motor  
Motor driver  
Scanner motor  
FAN motor  
CPU  
H8S  
Driver  
Motor driver  
Home position sensor  
Operation panel PWB  
Key switch  
ROM  
RAM  
EEPROM  
High voltage unit  
Display lamp  
Paper size sensor  
Toner sensor  
Developer cartridge  
Heat roller  
Thermistor  
Transfer roller  
Doctor  
Scanner  
Invertor  
lamp  
Main charger roller  
Developing  
roller  
Power PWB unit  
Heater lamp  
Drum  
OPC cartridge  
Temperature  
fuse  
Earth sheet  
Temperature  
fuse  
Control  
electrode  
Power SW  
a. Major sections operations and functions  
MCU (PCU) PWB  
The CPU controls the engine, and the ASIC performs image process.  
Image data (analog signals) from the scanner (reading) section are  
converted into digital signals by the A/D convertor and image process  
(area separation, filter process, gamma correction, resolution conver-  
sion, zooming) is performed by the ASIC and the line memory  
(SRAM). The processed data are outputted to the scanner (writing)  
section.  
During printing, the dot image data from the ICU PWB are received  
and outputted to the scanner (writing) section straightly. The CPU  
controls the machine operations according to the key operation sig-  
nals from the operation PWB. The loads (motor, lamp. solenoid, high  
voltage power PWB, etc.) are controlled according to the sensors and  
detectors signals. At the same time, the machine status data are  
outputted to the operation section and the ICU PWB.  
1 – 28  
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MCU PWB BLOCK DIAGRAM  
HOME  
POSITION  
SENSOR  
SCANNER  
MOTOR  
INVERTOR  
PWB  
CCD PWB  
f1,f2,  
SH-,RS,  
SP,CP  
MHPS_IN  
CN12  
MRMT0~3  
CN11  
CCDOUT  
CLCNT  
CN10  
CN14  
PAPER  
SIZE  
PSIZE_IN  
IC13  
IC112  
SENSOR  
VDATA  
LASER  
POLYGON  
MOTOR  
PMCLK  
PMD-  
LSU PWB  
IC5  
IC8  
CPU  
ASIC  
H8S/2350  
HG73C025FD  
PAPER  
EMPTY  
SENSOR  
PEMP_IN  
PAPER  
DSRDY-,RESERR-  
DPAGE-,VIDEO  
EXIT  
PSIZE_IN  
RTH_IN  
SENSOR  
ICU PWB  
VSYNC-,PRSTT  
RESET,DREADY-  
DCRDY-,ERROR  
SCLK,SYNC  
THERMISTOR  
CN1  
CN4  
CN5  
CN6  
MEN-,MMT0,1  
MCON,HL,TC/BIASON  
PUS,PR,PWMSIN  
PIN_IN-  
FW  
OPCLK,OPLATCH  
OPDATA,SELIN1,2,3OPKIN1,2  
OPPSW  
TS_IN  
VFMOUT  
TONER  
SENSOR  
OPERATION PANEL  
FAN MOTOR  
HIGH VOLTAGE PWB  
ICU PWB  
OPERATION PWB BLOCK DIAGRAM  
Print data from the host (PC) are developed by the ASIC and the line  
memory (DRAM) to converted into full dot image data, which are then  
outputted to the data select section in the MCU PWB. The machine  
status data from the MCU PWB are outputted tot he host (PC). In  
addition. the ASIC controls the parallel I/F.  
LAMP, VALUE DISPLAY LED  
DISPLAY CONTROLLER (DRIVER)  
IC901  
ICU PWB  
CN-901  
MCU PWB  
DECODER  
IC902  
CN202  
TO PC  
KEY SWITCH  
MCU  
PWB  
IC202  
GATE ARRAY  
CN203  
High voltage power PWB  
IC201  
DRAM  
This PWB supplies the high voltage used in the image process sec-  
tion. (Main charger, developing bias, transfer charger) It also includes  
the driver for the main motor. The power output is controlled by the  
control signals from the MCU (PCU) PWB.  
CN201  
TO PC  
Copy lamp control PWB  
The copy lamp light quantity is controlled so that the necessary quan-  
tity of light is provided even when conditions of the scanner (reading)  
section are changed.  
Operation PWB  
Status data from the MCU PWB are converted into the lamp and  
lamp display by the display controller. The key operations are con-  
verted into key data signals and outputted to the MCU (PCU) PWB.  
The copy lamp drive voltage is controlled by the output level of the  
light quantity sensor in the scanner (reading) section. Control is made  
with the control signals from the MCU (PCU) PWB.  
Power PWB  
The power PWB outputs DC power voltages (+24V, +5V, +3.3V,  
+12V) and drives the heater lamp.  
1 – 29  
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q
COPYRIGHT  
1998 BY SHARP CORPORATION  
All rights reserved.  
Printed in Japan.  
No part of this publication may be reproduced,  
stored in a retrieval system, or transmitted.  
In any form or by any means,  
electronic, mechanical, photocopying, recording, or otherwise,  
without prior written permission of the publisher.  
SHARP CORPORATION  
Printing Reprographic Systems Group  
Quality & Reliability Control Center  
Yamatokoriyama, Nara 639-1186, Japan  
1998 October Printed in Japan S  
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