CONTENTS

                                    TOPIC                                                             PAGE NO.

1. Company Profile                                                      1      
2. General                                                                     2

General                                                                2

Target user volume                                              2                                            

                             Main feature                                                        2

System configuration                                           3

3. Specifications                                                           4

Copy mode                                                          4

                             Environment conditions                                      6

                             Production number identification                        7

                             Consumable parts recycling process                   8

                             External wires and structures                              9

                             Unpacking and installation                                14

4.   Operation cycle                                                     21

 Laser unit                                                          22

 Paper feed section                                             23

5.    Adjustment                                                          26

 Adjustment section                                           26

 Process section                                                 27

 Mechanism section                                           29

        COMPANY PROFILE

Sharp industries are an established high end technology driven company with strong focus in the niche area of Instrument Control.

Sharp industries have been established in 1912 and the founder was Tokuji Hayakawa. In 1915 also he continued to research and improves the instruments used.

He made this independent industry to make the photocopy of any paper, or to pass on any idea on mail, to contact with the people, to exchange information that means to make a metal writing instrument. In May 1935, the structure of the company was modified to become a joint stock corporation under the name of Tokuji Hayakawa metal work institute.

The total  capital stock 204,675 millions yen.

 The total sales are 3,417,736 million yen.

The total employee which works under it are 60,900 that means it provides a large numbers of persons to employment.

 They were the first one to launch the machines for the printing or the zerox different for the commercial and industrial purpose. They were the first one to develop the papers through the internet thus is now used worldwide.

1. GENERAL

This model is a digital personal copier produced with the key words of “COMFORTABLE COPY” , clear copy, easy copy providing the high copies and performance.

              2) TARGET USER VOLUME

Stand alone copier-------2000-3000 sheets

Compound machine-----4000-5000 sheets

              3) MAIN FEATURE

1. First copy time is 7.2 seconds.
2. Zoom copying from 50%-200%.
3. Continuous copying of maximum 99 sheets can also be performed.
4. Toner save mode reduces toner consumption by approximately 10%.
5. An optional single pass feeder allows automatic document feeding of up to 30 sheets.
6. An optional electronic sort board allows many useful copier features to be used. Multiple sets of copies can be sorted without the aid of a sorter and each set can be offset from the previous set. Also the erase, margin shift, and 4 in 1 and 2 in 1 functions are also available.
7. This copier can be used as a laser printer by installing an operational printer upgraded kit.
8. This copier can be used as a facsimile machine by installing an optional facsimile upgraded kit.
9. Useful special feature such as XY zoom, black and white, and dual pages are also available.
10. User programs allow the internal auditor to be controlled.

.

5) EXTERNAL WIRES AND INTERNAL STRUCTURES

2) INTERNAL

4) MOTOR, SOLENOID, CLUTCH

.

. 

5) SENSOR SWITCH                                   

6) PWD section

         .

d.

6) UNPACKING AND INSTALLATION   

A) Installation of Machine

1) Installation conditions    

Since the machine performance is largely affected by the installing conditions, take enough considerations on the following items

1. ENVIRONMENT

1. Avoid installation at a place with direct sunlight, if not plastic parts may be deformed.
2. Avoid installation near a heater, a humidifier, or an air conditioner where humidity and temperature are extremely high or low.
3. Avoid installation at a dusty place. If dust enters the machine, dirty copy or a trouble may be caused.
4. Avoid installation at a place with vibrations.
5. Avoid installation at a poorly ventilated place.

2. SPACE AROUND THE COPIER

Allow the space more between the rear side and the wall.

3. POWER SOURCE

Use an exclusive power supply outlet of 15 amps and 100 volts or more. If the power plug of this machine is inserted into a power outlet commonly used with other illumination units, flickers of the lamp may be resulted. Avoid complex wiring.

4. GROUNDING WIRE CONNECTION

To avoid danger be sure to connect a grounding wire, and if no grounded wire is , connected and a leakage occurs, a fire or shock may be resulted.

2)  REMOVAL OF PROTECTIVE MATERIAL AND FIXING CREW

   1) Remove all the tapes and protective material, remove all the tapes, then open the                                     document cover and remove the material of sheet shape.

   2) Remove the fixing crew.

                                            .

It is the function of the microcontroller to scan the keyboard

5. OPERATIONAL DESCRIPTIONS

1. Setting conditions: Operational panel

Set copy conditions such as the copy quantity and the copy density with the operation section, and press the start key. The information on copy conditions is sent to the MCU.

2. Image scanning: scanner section

When the start key 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.

3. Photo signal/ electrical signal conversion

The image is converted into electrical signals by the CCD circuit and passed to the MCU

4. Image process: MCU

The document signal sent from CCD circuit is processed under the revised condition and sent to LSU as print data.

2) SCANNING PROCESS

A) SCAN PROCESS

The scanners are arranged in a line. These scan a certain document at a time and deliver the outputs. When the line is finished, next line is scanned and this procedure is repeated. The figure is shown where the case an image is shown and scanning can be seen.

The direction of this is called main scanning direction, and scanning direction and the sub scanning direction. The basic resolution indicates the scanner capacity. The basic resolution is expressed in dpi(dot/inch) which shows the number of light elements per inch on the document.

The basic resolution of this machine is 400dpi.

In the sub scanning, at the same time, the motor that drives the optical system is controlled to scan the image at the basic resolution.

B) ACTUAL PRINT PROCESS

1) CHARGING

A high voltage is applied to the main charger, and negative charges are discharged to  OPC drum. A screen grid is provided between the main charger and the OPC drum and the negatives charged on the OPC drum surface.

Positive charges are attracted by the negative electrode on the OPC drum surface and excited in the aluminium layer.

2) EXPOSURE

A laser beam is generated from the semiconductor laser and controlled by the print pattern signal. The laser writes onto the OPC drum surface through the polygon mirrors and lenses. The resistance of the OPC layer decreases for an area exposed by the laser .The beam neutralizes the negative charge. An electrostatic latent image is formed on the drum surface.

3) DEVELOPING

A bias potential is applied to the MG roller in a two component magnetic brush developing method, and the toner is charged negative through friction with the carrier. Non –image area of the drum surfaced charged with negative potential repel the toner, where as the laser exposed portions where no negative charges exist, attract the toner. As a result, a visible image appears on the drum surface.

           4) TRANSFER

The visible image on the drum surface is transferred onto the print by applying a positive charge from transfer corona to the back side of the print paper.

          5)SEPARATION

Since the print paper is charged positively by the transfer corona, it is discharged by the separation corona. The separation corona is connected to ground.

6. CLEANING

Toner remaining on drum is removed and collected by the cleaning blade. It is transported to the waste toner collecting section in the cleaning unit by the waste toner transport roller.

                                          OPERATION   CYCLE

LASER UNIT

The image sent from the MCU (image process circuit) is send to the LSU (laser unit), where it is converted into laser beams.

1. BASIC STRUCTURE

The LSU unit is the writing section of the digital optical system. The semiconductor laser is used as the light source, and the images are formed on the OPC drum by the polygon and the f0 lens.

The lasers beams are passed through the collimator lens, the cylindrical lens, polygon mirror, f0 lens, and the mirror to form images on the OPC drum in the main scanning direction. The laser emitting PWD is provided with the APC(auto power control) in order to eliminate fluctuations in the laser power. The BD PWD works for measurement of the laser writing start point.

5) PAPER FEED SECTION

A) BASIC STRUCTURE

1. Cassette paper fed roller
2. Main motor
3. Cassette paper feed solenoid
4. Cassette paper feed roller clutch
5. Manual paper feed roller
6. Manual paper transport roller
7. Manual paper feed roller clutch
8. Manual paper transport roller clutch
9. Manual paper feed roller solenoid
10. Manual paper transport roller solenoid
11. Resist roller
12. Resist roller clutch
13. Resist roller solenoid

2) MANUAL PAPER FEED OPERATION

Select the manual paper feed tray and press the START button, and the manual paper feed roller will be turned on to bring the paper feed roller in contact with paper and lift the shutter simultaneously.

The drive power of the main motor is transmitted through the manual feed roller clutch to the manual feed roller, rotating the manual feed roller and feeding roller.

3) RESIST ROLLER

In order to make synchronization between the paper lead edge fed from the paper feed port and the image lead edge, the roller is kept stationary for a certain time after the paper reaches at the roller to wrap the paper a little.

When the paper is wrapped to a certain level, the resist roller solenoid is turned on to release the resist roller clutch.

The drive power of the main motor is transmitted through the resist roller clutch to the resist roller, rotating the resist roller and the feeding paper.

7)FUSION SECTION

1. Before using paper guide
2. Upper heat roller
3. Thermistor
4. Thermostat
5. Separation pawl
6. POD1
7. Heater lamp
8. Lower heat roller

2. HEAT ROLLER

A pressure roller is used for the heat roller and a silicone rubber is used for the roller heater for better toner fusing performance and paper separation.

3. SEPARATOR PAWL

Four separator pawls are used on the upper heat roller. The separators pawls are Teflon are coated to reduce function with the roller and prevent a smear on the paper caused by the separator pawl.

4. THERMAL CONTROL

1. The heater lamp, thermistor, main PWB, power supply 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 thermostat is used for safety purpose.

2. The surface temperature of the upper heat roller is set to 180C -195C.      The surface temperature during the power save mode is set to 100C.
3. The self –check function comes active when one of the functions occurs, and an H is displayed on the copy quantity display. During machine operation, the case where the fusing temperature does not reach 155C within 55 seconds from lighting of the heater lamp. During printing when the fusion temperature falls below 145C.Fusing temperature of about 220 to 240C.

7. ADJUSTMENT

1)ADJUSMENT LIST

2)PROCESS SECTION

1) Developing doctor gap adjustment

a) Loosen the developing doctor fixing screw A.

b) Insert a thickness gauge of 1.5 mm to three positions at 20mm and 30mm from both the sides of the developing doctor

2) MG roller main pole position adjustment

a) Remove and separate the waste toner box and put the developing unit on a flat surface.

b) Tie a string to a needle and spring.

c) Hold the string and bring the needle close to the MG roller horizontally.

d) Do not bring the needle into contact with the MG roller, but bring it to a position 2 or 3mm apart from the MG roller. Mark the point on the MG roller which is on the extension line from the needle point.

e) Measure the distance from the marking position to the top of the doctor plate of the developing unit to ensure that it is 18mm. If the distance is not within the specified range, loosen the fixing screw A of the main pole adjustment plate, and move the adjustment plate in the arrow direction to adjust.

Grid bias voltage adjustment

1. Set the digital multimeter range to DC700V.
2. Put the test rod of the digital multimeter on the grid bias voltage output check pin.
3. Execute the SIM 8-3.
4. Adjust the adjustment volume VR52  so that the output  voltage is within he specified range
5. Execute SIM 8-2.
6. Adjust the adjustment volume VR51 so that the output voltage is within the specified range.

B) MECHANISM SECTION

1) Image position adjustment

a) Set a scale on the document table.

b) Make a copy

c) Check the copy.

d) Execute the SIM 50-1

Bibliography

www.sharpindustries.coms

www.tokujayihayakawa.com

www.zeroxmachines.com

www.instrumentationmachines.co.in