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Di450/Di550
SERVICE MANUAL
[GENERAL]
INDEX (GENERAL) GENERAL
MECHANICAL/ELECTRICAL
GENERAL
11563
CONTENTS
1. SAFETY INFORMATION ................................................................................. G-1 2. SPECIFICATION ............................................................................................. G-6 3. PRECAUTIONS FOR INSTALLATION ............................................................ G-9 3-1. Installation Site ........................................................................................ G-9 3-2. Power Source .......................................................................................... G-9 3-3. Grounding ................................................................................................ G-9 4. PRECAUTIONS FOR USE .............................................................................. G-10 4-1. To ensure that the copier is used in an optimum condition ..................... G-10 4-2. Operating Environment ............................................................................ G-10 4-3. Power Requirements ............................................................................... G-10 4-4. Note ......................................................................................................... G-10 5. HANDLING OF CONSUMABLES .................................................................... G-11 6. OTHER PRECAUTIONS ................................................................................. G-11 7. SYSTEM OPTIONS ......................................................................................... G-12
i
1.
SAFETY INFORMATION
Laser Safety
This is a digital machine which prints by means of a laser. There is no possibility of danger from the laser, provided the machine is operated according to the instructions in this manual. Since radiation emitted by the laser is completely confined within protective housing, the laser beam cannot escape from the machine during any phase of user operation. This machine is certified as a Class 1 product. This means the machine does not produce hazardous laser radiation. CAUTION: The use of controls, adjustments or performance of procedures other than those specified in this manual may result in hazardous radiation exposure. Because of this, Minolta strongly recommends that you operate your copy machine only as described in this documentation.
Internal Laser Radiation
Maximum Average Radiation Power: 13.6 µW at laser aperture of the print head unit Wavelength: 785 nm This product employs a Class IIIb Laser Diode that emits an invisible laser beam. The Laser Diode and Scanning Polygon Mirror are incorporated in the print head unit. The print head unit is NOT A FIELD SERVICE ITEM. Therefore, the print head unit should not be opened under any circumstances.
For United States
CDRH regulation This copier is certified as a Class 1 Laser product under the Radiation Performance Standard according to the Food, Drug and Cosmetic Act of 1990. Compliance is mandatory for Laser products marketed in the United States and is reported to the Center for Devices and Radiological Health (CDRH) of the U.S. Food and Drug Administration of the U.S. Department of Health and Human Services (DHHS). This means that the device does not produce hazardous laser radiation.
G-1
The label shown on page G-3 indicates compliance with the CDRH regulations and must be attached to laser products marketed in the United States. CAUTION: Use of controls, adjustments or performance of procedures other than those specified in this manual may result in hazardous radiation exposure. This is a semiconductor laser. The maximum power of the laser diode is 0.68 mW and the wavelength is 785 nm. For Europe CAUTION: Use of controls, adjustments or performance of procedures other than those specified in this manual may result in hazardous radiation exposure. This is a semiconductor laser. The maximum power of the laser diode is 0.68 mW and the wavelength is 785 nm. For Denmark ADVARSEL Usynlig laserstråling ved åbning, når sikkerhedsafbrydere er ude af funktion. Undgå udsættelse for stråling. Klasse 1 laser produkt der opfylder IEC60825 sikkerheds kravene. Dansk: Dette er en halvlederlaser. Laserdiodens højeste styrke er 0.68mW og bølgelængden er 785nm. For Finland LUOKAN 1 LASERLAITE VAROITUS Laitteen käyttäminen muulla kuin tässä käyttöohjeessa mainitulla tavalla saattaa altistaa käyttäjän turvallisuusluokan 1 ylittävälle näkymättömälle lasersäteilylle. VARO Avattaessa ja suojalukitus ohitettaessa olet alttiina näkymättomälle lasersäteilylle. Älä katso säteeseen. Tämä on puolijohdelaser. Laserdiodin suurin teho on 0.68mW ja aallonpituus on 785nm. For Sweden KLASS 1 LASER APPARAT VARNING Om apparaten används på annat sätt än i denna bruksanvisning specificerats, kan användaren utsättas för osynlig laserstrålning, som överskrider gränsen för laserklass 1.
G-2
VARNING Osynlig laserstråining när denna del är öppnad och spärren är urkopplad. Betrakta ej stråien. Det här är en halvledarlaser. Den maximala effekten för laserdioden är 0.68mW och våglängden är 785nm. For Norway ADVERSEL Dersom apparatet brukes på annen måte enn spesifisert i denne bruksanvisning, kan brukeren utsettes för unsynlig laserstrålning, som overskrider grensen for laser klass 1. Dette en halveder laser. Maksimal effekt till laserdiode er 0.68 mW og blgelengde er 785 nm.
Laser Safety Label
A laser safety label is attached to the outside of the copy machine as shown below.
Laser safety label For Europe
CLASS 1 LASER PRODUCT LASER KLASSE 1 PRODUKT
For United States
1166O252BA
MINOLTA CO., LTD
2, Higashiakatsuchi, Yawata-cho, Toyokawa-shi Aichi-ken 442-8585, Japan
MANUFACTURED:
THIS PRODUCT COMPLIES WITH 21 CFR CHAPTER I, SUBCHAPTER J.
0946-7101-14
4002O110CB
Manufacturer's Name Plate The Manufacturer's Name Plate is affixed at the position illustrated above. Please write down the Model Name and Serial No. of your copier here. Model: Serial No.:
1166O248AA
G-3
Label inside copy machine
The following laser safety label will be attached inside the copy machine as shown below. Please read the following for your own protection. Caution Opening the cover indicated by the Caution label may expose you to harmful laser radiation which could cause damage or loss of eyesight. Do not open the cover when the power is on.
1167P001AA
Print Head
4002G510AA
G-4
ALL Areas CAUTION Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type recommended by the manufacturer. Dispose of used batteries according to the manufacturer's instructions. Germany only VORSICHT! Explosinsgefahr bei unsachgemäßen austausch der batterie. Ersatz nur durch denselben oder einen vom hersteller empfohlenen ähnlichen typ. Entsorgung gebrauchter batterien nach angaben des herstellers. Denmark only ADVARSEL! Lithiumbatteri - Eksplosionsfare ved fejlagtig håndtering Udskiftning må kun ske med batteri af samme fabrikat og type. Levér det brugte batteri tilbage til leverandøren. Norway only ADVARSEL Eksplosjonsfare ved feilaktig skifte av batteri. Benytt samme batteritype eller en tilsvarende type anbefalt av apparatfabrikanten. Brukte batterier kasseres i henhold til fabrikantens instruksjoner. Sweden only VARNING Explosionsfara vid felaktigt batteribyte. Använd samma batterityp eller en ekvivalent typ som rekommenderas av apparattillverkaren. Kassera använt batteri enligt fabrikantens instruktion. Finland only VAROlTUS Paristo voi räjähtää, los se on virheellisesti asennettu. Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiin. Hävitä Käytetty paristo valmistajan ohjeiden mukaisesti. ALL Areas CAUTION "Replace only with the same or equivalent type recommended by the manufacturer. Dispose of used IC Package according to the manufacturer's instructions." Germany only VORSICHT! "Austausch nur durch denselben oder einen vom Hersteller empfohlenen, gleichwertigen typ. Entsorgung gebrauchter Batterien nach Angaben des Herstellers.
G-5
2.
SPECIFICATION
: : : : : : Console Lens Reduction Type CCD Line Sensor Organic Photoconductor Electrostatic Dry Powdered Image Transfer to Plain Paper 600 dpi × 600 dpi 4-Way system Multi Bypass Table : 50 sheets of paper 1st Drawer (Universal) : 500 sheets of paper 2nd Drawer (Universal) : 500 sheets of paper 3rd Drawer : 2500 sheets of paper 5-Way system Multi Bypass Table : 50 sheets of paper 1st Drawer (Universal) : 500 sheets of paper 2nd Drawer (Universal) : 500 sheets of paper 3rd Drawer : 500 sheets of paper 4th Drawer : 500 sheets of paper Mirror Scanning, Slit Exposure New Micro-Toning System Comb Electrode DC Negative Corona with Scorotron System Visible Image Transfer by means of a Single-Wire DC Negative Corona with Corotron System AC Corona with Corotron System, plus Paper Separator Finger Heat Roller Charge Neutralizing Brush Metric-A3L; Inch-11 × 17 L (L: Lengthwise)
: Permissible -: Not permissible C: Crosswise 1st to 2nd Drawer 297 × 432 mm 140 × 182 mm 4WAY (LCC) A4C 8-1/2 × 11 C Inch 5WAY (3rd to 4th) Multi Bypass Table *1 *1 *1 Duplex
TYPE ORIGINAL SCANNING SYSTEM PHOTOCONDUCTOR COPYING SYSTEM RESOLUTION PAPER FEEDING SYSTEM
EXPOSURE SYSTEM DEVELOPING SYSTEM CHARGING SYSTEM IMAGE TRANSFER SYSTEM PAPER SEPARATING SYSTEM FUSING SYSTEM PAPER DISCHARGING SYSTEM MAXIMUM ORIGINAL SIZE COPY MEDIUM
Paper Source Plain paper (60 to 90 g/m2) Medium Translucent paper Transparencies Thick paper (90 to 157 g/m2) Recycled paper Dimensions Maximum (Width × Length) Minimum (Width × Length)
: : : : : : : :
297 × 432 mm 297 × 432 mm 11-3/4 × 17 297 × 432 mm Inch 210 × 280 mm 100 × 140 mm 140 × 182 mm 4 × 5-3/4 Inch
*1: 20 sheets or less
G-6
MULTIPLE COPIES WARMING-UP TIME FIRST COPY TIME
: 1 to 999 : 4 minute with room temperature of 20 °C and rated power voltage : A4C: 4.0 second or less (in Full size Mode using 1st Drawer)
CONTINUOUS COPY SPEED (copies/minute) Fed from 1st Drawer/Memory Mode: 45 Piece Copy Machine
Area Zoom Ratio Size A3L A4L A4C B4L ×1.000 28 36 45 32 Area Zoom Ratio Size 11 × 17 (L) 8-1/2 × 11 (L) 8-1/2 × 11 (C) 8-1/2 × 14 (L) ×1.000 28 38 45 32
Metric
Inch
55 Piece Copy Machine
Area Zoom Ratio Size A3L A4L A4C B4L ×1.000 32 43 55 36 Area Zoom Ratio Size 11 × 17 (L) 8-1/2 × 11 (L) 8-1/2 × 11 (C) 8-1/2 × 14 (L) ×1.000 31 45 55 37
Metric
Inch
L: Lengthwise; C: Crosswise ZOOM RATIOS
Area Mode Full Size Metric ×1.000 ×0.816 ×0.707 ×0.500 ×1.154 ×1.414 ×2.000 25 % to 400 % (in 0.1 % increments) Inch ×1.000 ×0.785 ×0.733 ×0.647 ×0.500 ×1.214 ×1.294 ×1.545 ×2.000
Fixed
Reduction
Enlargement
Variable
LENS EXPOSURE LAMP FUSING TEMPERATURE
: Through Lens (F = 4.0, f = 62 mm) : Rare Gas Fluorescent Light (20 W) : 190 °C
G-7
POWER/CURRENT CONSUMPTION (copier only)
Voltage 115 V 120 V 220 V 240 V Exposure Lamp (Rating) Fusing Heater Lamp (Rating) 120 V Upper: 850 W Lower: 200 W 230 V Upper: 1011 W Lower: 200 W Max. Power Consumption (Full System) 1430 W ± 10 % In Standby
1230 W ± 10 %
24 V 20 W
1700 W ± 10 %
1380 W ± 10 %
POWER REQUIREMENTS ENVIRONMENTAL CONDITIONS COPIER DIMENSIONS
: 115 V, 120 V, 127 V, 220-240 V; 50/60 Hz
COPIER WEIGHT
: Width .... 645 mm (25-2/5 inch) Depth .... 756 mm (29-3/4 inch) Height ... 1032 mm (40-3/5 inch) With Cabinet : 158.5 kg (348-1/4 lbs) (Copier: 113kg, Cabinet: 45.5kg) Excluding the Copy Tray, Starter, Toner, and Paper
G-8
3.
3-1.
PRECAUTIONS FOR INSTALLATION
Installation Site
To ensure safety and utmost performance of the copier, the copier should NOT be used in a place: · Where it will be subjected to extremely high or low temperature or humidity. · Where it will be subjected to sudden fluctuations in either temperature or humidity. · Which is exposed to direct sunlight. · Which is in the direct air stream of an air conditioner, heater, or ventilator. · Which has poor ventilation or is dusty. · Which does not have a stable, level floor or where it will receive undue vibration. · Which is near any kind of heating device. · Which is near volatile flammables (thinner, gasoline, etc.). · Where it may be splashed with water. · Which puts the operator in the direct stream of exhaust from the copier. · Where ammonia gas might be generated.
3-2.
Power Source
· If any other electrical equipment is sourced from the same power outlet, make sure that the capacity of the outlet is not exceeded. · Use a power source with little voltage fluctuation. · Never connect by means of a multiple socket any other appliances or machines to the outlet being used for the copier. · Ensure that the copier does not ride on the power cord or communication cable of other electrical equipment, and that it does not become wedged into or underneath the mechanism. · Make the following checks at frequent intervals: Is the power plug abnormally hot? Are there any cracks or scrapes in the cord? Has the power plug been inserted fully into the outlet? Does something, including the copier itself, ride on the power cord? Use an outlet with a capacity of 115/120 V, 15 A or more. 200-220 V, 20 A or more.
3-3.
Grounding
· Always ground the copier to prevent receiving electrical shocks in the case of electrical leakage. · Connect the ground wire to the ground terminal of the outlet or a grounding contact which complies with the local electrical standards. · Never connect the ground wire to a gas pipe, the ground wire for a telephone, lightning arrester, or a water pipe for fear of fire and electrical shock.
G-9
4.
4-1.
PRECAUTIONS FOR USE
To ensure that the copier is used in an optimum condition
· Never place a heavy object on the copier or subject the copier to shocks. · Insert the power plug all the way into the outlet. · Do not attempt to remove any panel or cover which is secured while the copier is making copies. · Do not turn OFF the copier while it is making copies. · Provide good ventilation when making a large number of copies continuously. · Never use flammable sprays near the copier. · If the copier becomes inordinately hot or produces abnormal noise, turn it OFF and unplug it. · Do not turn ON the power switch at the same time when you plug the power cord into the outlet. · When unplugging the power cord, do not pull on the cord; hold the plug and pull it out. · Do not bring any magnetized object near the copier. · Do not place a vase or vessel containing water on the copier. · Be sure to turn OFF the power switch at the end of the workday or upon power failure. · Use care not to drop paper clips, staples, or other small pieces of metal into the copier.
4-2.
Operating Environment
The operating environmental requirements of the copier are as follows. · Temperature: 10 to 32 °C · Humidity: 15 to 85 % · Rate of temperature change: 10 °C/h · Rate of humidity change: 10 %/h
4-3.
Power Requirements
The power source voltage requirements are as follows. · Voltage fluctuation: AC 115, 120, 220, 240 V ± 10 % (copying performance assured) +10 % (paper feeding performance assured) -15 % · Frequency fluctuation: 50/60 Hz ± 0.3 Hz
4-4.
Note
· It is prohibited to copy paper and hard currencies, government securities, and municipal bonds (even when they are stamped as "Sample"). · For fear of infringement of copyright, it is also prohibited to copy copyrighted works, including books, music, works of art, maps, drawings, motion pictures, and photos except when the copy is to be used only personally.
G-10
5.
HANDLING OF CONSUMABLES
Before using any consumables, always read the label on its container carefully. · Paper can be easily damaged by dampness. To prevent absorption of moisture, store paper, which has been removed from its wrapper but not loaded in the drawer, in a sealed plastic bag in a cool, dark place. · Keep consumables out of the reach of children. · Do not touch the PC Drum with bare hands. · The same sized paper is of two kinds, short grain and long grain. Short grain paper should only be fed through the copier crosswise, long grain paper should only be fed lengthwise. · If your hands become soiled with toner, wash them with soap and water. · Do not throw away any used consumables (PC Drum, starter, toner, etc.). They are to be collected. · Do not burn, bury in the ground, or throw into the water any consumables (PC Drum, starter, toner, etc.). · Do not store consumables in a place which: Is hot and humid. Is subject to direct sunlight. Has an open flame nearby.
6.
OTHER PRECAUTIONS
Use the following precautions when performing service jobs for a copier that uses a laser. · When a service job needs to be performed in the laser beam path, such as when working around the printerhead or PC Drum, be sure first to unplug the power cord of the copier from the outlet. · If the job requires that the power cord be left plugged in, observe the following precautions. · Take off your watch, ring and any other reflective object and wear laser protective goggles. · Keep users away from the job site. · Do not bring a highly reflective tool into the laser beam path during the service job.
G-11
7.
SYSTEM OPTIONS
5 6 7
4002G508AA
4002G507AA
1145M035AA
8
4002G506AA
14 9 13 1
4002G502AA
2
4002G501AA
4002G504AA
3, 4
4002G503AA
10
4002G511AA
4002G509AA
11
4002G505AA
12
1. 2. 3. 4. 5. 6. 7.
Copier 2 Way Paper Feed Cabinet PF-208 Large Capacity Cassette PF-115 Duplexing Paper Feed Cabinet PF-7D Data Controller D-103 Plug-In Counter Electronic Document Handler EDH-3
8. Original Cover OC-1 9. Large Capacity Cassette C-306 10. Large Capacity Cassette C-306L 11. 32 MB Memory M32-2 12. Hard Disk Drive Kit HDD-1 13. Finisher FN-105, FN106 14. Data Terminal DT-105 (MC Only)
G-12
MECHANICAL/ ELECTRICAL
11563
CONTENTS
1. 2. 3. 4. 5. CROSS SECTIONAL VIEW ............................................................................ M-1 COPY PROCESS ............................................................................................ M-2 DRIVE SYSTEM .............................................................................................. M-4 SEQUENTIAL EXPLANATION ........................................................................ M-5 IMAGE STABILIZATION SYSTEM .................................................................. M-6 5-1. AIDC Sensor ............................................................................................ M-7 5-2. Image Stabilization System Control ......................................................... M-8 PC DRUM SECTION ....................................................................................... M-9 6-1. PC Drum Drive Mechanism ..................................................................... M-9 6-2. Grounding of the PC Drum ...................................................................... M-10 PC DRUM CHARGING SECTION ................................................................... M-11 IMAGE READING SECTION ........................................................................... M-12 8-1. Exposure Components Section ............................................................... M-13 8-2. Exposure Lamp Control ........................................................................... M-14 8-3. Image Processing Process ...................................................................... M-16 8-4. Image Density Control ............................................................................. M-18 (1) Auto Exposure Control .................................................................... M-18 (2) Manual Exposure Control ................................................................ M-21 8-5. Scanner and Mirrors Carriage Movement Mechanism ............................ M-23 (1) Scanner Movement Mechanism ...................................................... M-23 (2) 2nd/3rd Mirrors Carriage Movement Mechanism ............................ M-23 8-6. Scanner Motor Drive Control ................................................................... M-24 MEMORY SECTION ........................................................................................ M-25 9-1. Image Processing Process ...................................................................... M-25 Original Size Detecting Section ....................................................................... M-26 10-1.Original Size Detecting Operation ........................................................... M-26 10-2.Original Size Detecting Sensors Locations ............................................. M-27 10-3.Original Size Detection ............................................................................ M-28 10-4.Original Size Detection Timing ................................................................ M-29 PH SECTION ................................................................................................... M-30 11-1.Image Processing Process ...................................................................... M-31 11-2.Laser Emission Timing (SOS Signal) ...................................................... M-33 DEVELOPING UNIT SECTION ....................................................................... M-35 12-1.Developing Unit Drive Mechanism .......................................................... M-36 12-2.Sleeve/Magnet Roller .............................................................................. M-37 12-3.Doctor Blade ............................................................................................ M-37 12-4.Developing Bias ....................................................................................... M-38 12-5.ATDC Sensor .......................................................................................... M-39 (1) ATDC Sensor Automatic Adjustment .............................................. M-39 12-6.Toner Replenishing Control ..................................................................... M-40 12-7.Toner Supply Hole Covering/Uncovering Mechanism ............................. M-40 12-8.Toner Bottle Home Position Detection Mechanism ................................. M-41 12-9.Toner Bottle Vibration Mechanism .......................................................... M-41 12-10.Main Hopper Toner Replenishing Mechanism ...................................... M-42 12-11.Main Hopper Locking Mechanism ......................................................... M-42 12-12.Sub Hopper Toner Replenishing Mechanism ........................................ M-43
6.
7. 8.
9. 10.
11.
12.
i
12-13.Sub Hopper Toner Empty Detecting Mechanism .................................. M-44 13. PAPER TAKE UP/FEED SECTION ................................................................. M-45 13-1.Drawer In Position Detection ................................................................... M-46 13-2.Paper Empty Detection Mechanism ........................................................ M-47 13-3.Drawer Paper Lifting/Lowering Mechanism ............................................. M-48 13-4.Paper Level Detection Mechanism .......................................................... M-50 13-5.Universal Tray Paper Size Detection Mechanism ................................... M-51 13-6.Paper Take Up Mechanism ..................................................................... M-53 (1) Paper Separating Mechanism ......................................................... M-53 (2) Paper Pressure Release Mechanism .............................................. M-54 (3) Paper Take Up Roll Retracting Mechanism .................................... M-54 13-7.Paper Take Up Control ............................................................................ M-55 (1) Paper Take Up Motor Control .......................................................... M-55 (2) Paper Take Up Retry Control .......................................................... M-55 (3) Paper Take Up Interval Control ....................................................... M-56 (4) Double Feed Paper Take Up Control .............................................. M-56 13-8.Vertical Transport Drive Mechanism ....................................................... M-57 14. MANUAL FEED TABLE SECTION .................................................................. M-58 14-1.Manual Take Up Roll Pressure Mechanism ............................................ M-59 14-2.Manual Feed Paper Separating Mechanism ........................................... M-59 14-3.Manual Feed Paper Empty Detection Mechanism .................................. M-60 14-4.Manual Feed Take Up Control ................................................................ M-60 15. TRANSPORT/SYNCHRONIZING ROLLERS SECTION ................................. M-61 15-1.Paper Dust Remover ............................................................................... M-61 15-2.Transport Roller Drive Mechanism .......................................................... M-62 15-3.Synchronizing Roller Drive Mechanism ................................................... M-62 16. IMAGE TRANSFER AND PAPER SEPARATION SECTION .......................... M-63 16-1.PC Drum Paper Separator Fingers Section ............................................ M-64 (1) Finger Pressing Detection Mechanism ............................................ M-64 (2) Finger Back and Forth Detection Mechanism ................................. M-64 17. PC DRUM CLEANING SECTION .................................................................... M-65 17-1.Cleaning Blade Moving Mechanism ........................................................ M-65 17-2.Toner Conveying/Collecting Mechanism ................................................. M-66 18. MAIN ERASE SECTION .................................................................................. M-67 19. TRANSPORT SECTION .................................................................................. M-68 20. FUSING UNIT SECTION ................................................................................. M-69 20-1.Fusing Unit Drive Mechanism .................................................................. M-70 20-2.Fusing Rollers Pressure Mechanism ....................................................... M-71 20-3.Fusing Roller Cleaning Mechanism ......................................................... M-72 (1) Cleaning Web Take Up Mechanism ................................................ M-72 20-4.Fusing Temperature Control .................................................................... M-73 20-5.Mechanism and Control of Fusing Roller Small-Amount Turning ............ M-74 20-6.CPM Control ............................................................................................ M-75 21. EXIT/DUPLEX SWITCHING SECTION ........................................................... M-76 21-1.Exit/Duplex Switching Mechanism ........................................................... M-77 22. TURNOVER SECTION .................................................................................... M-78 22-1.Turnover Drive Mechanism ..................................................................... M-79
ii
22-2.Turnover Control ...................................................................................... M-80 22-3.Turnover Roller Separation Control ......................................................... M-81 22-4.Turnover/Exit Mechanism ........................................................................ M-82 (1) Selection of Turnover or Exit Path ................................................... M-82 (2) Path for Accommodating Paper Longer Than A4L .......................... M-82 23. OTHER MECHANISM ..................................................................................... M-83 23-1.Memory Backup ....................................................................................... M-83 23-2.Flash Memory .......................................................................................... M-84 23-3.Dehumidifying Mechanism ...................................................................... M-85 (1) PC Drum Dehumidifying .................................................................. M-85 (2) Paper Dehumidifying Mechanism .................................................... M-85 23-4.Cooling Mechanism ................................................................................. M-86 (1) IR Section Cooling Mechanism ....................................................... M-86 (2) Fusing Section Cooling Mechanism ................................................ M-87 (3) Copier Interior Cooling Mechanism ................................................. M-88 (4) Power Supply Section Cooling Mechanism ..................................... M-89
iii
1.
CROSS SECTIONAL VIEW
1 2
3
4
5
4002M501AA
6
1. Fusing Section 2. IR Section 3. PH Section
4. Developing Section 5. Paper Tray 6. Exit/Turnover Section
M-1
2.
COPY PROCESS
3. Photoelectric Conversion 4. IR ImageProcessing 5. Memory 2. Drum Charging 6. PH ImageProcessing 7. Laser Exposure
14. Main Erase 13. Cleaning 1. PC Drum 8. Developing
17. Exit/Turnover Switching
16. Fusing
12. Paper 15. Transport Separation
11. Image Transfer
10. Bypass Paper Feeding
18. Turnover
19. Duplex Unit
9. Paper Feeding
4002M502CA
1. PC Drum · Used as the medium on which a visible developed image of the original is formed. 2. Drum Charging · A uniform negative DC charge is deposited across the entire surface of the PC Drum. 3. Photoelectric Conversion · CCD converts the image data represented by light reflected off the original to a corresponding electrical signal which, in turn, is output to IR image-processing section. 4. IR Image-Processing · The electrical signal is converted to an 8-bit digital image signal (A/D conversion) which, in turn, goes through appropriate correction before being output to the memory. 5. Memory · The digital image signal is compressed and stored in memory. It is then output to the PH image-processing section. 6. PH Image Processing · After going through corrections, the digital image signal is converted to a corresponding electrical signal (D/A conversion) that controls the intensity of the light from the laser diode. 7. Laser Exposure · The laser beam strikes the surface of the PC Drum, forming an electrostatic latent image. 8. Developing · Toner negatively charged in the Developer Mixing Chamber is attracted onto the electrostatic latent image changing it to a visible, developed image. · An AC/DC negative bias voltage is applied to the Sleeve/Magnet Roller to prevent toner from being attracted onto those areas of the PC Drum which correspond to the background areas of the original. 9. Paper Feeding · Paper is fed from the drawer.
M-2
10. Bypass Paper Feeding · Paper is fed from the Bypass Table. 11. Image Transfer · A DC positive corona emission is applied to the back side of the paper, thereby attracting toner onto the surface of the paper. 12. Paper Separation · An AC corona and a DC negative corona emission is applied to the back side of the paper to neutralize the paper, while the PC Drum Paper Separator Fingers mechanically remove the paper from the surface of the PC Drum. 13. Cleaning · Residual toner on the surface of the PC Drum is scraped off. 14. Main Erase · Light is directed to the surface of the PC Drum to neutralize any surface potential remaining there after cleaning. 15. Transport · The paper is fed to the Fusing Unit. 16. Fusing · The developed image is permanently fused to the paper by a combination of heat and pressure applied by the Upper and Lower Fusing Rollers. 17. Exit/Turnover Switching · The paper is either fed out onto the Exit Tray or into the turnover mechanism. 18. Turnover · The 1-sided copy is turned over and fed into the Duplex Unit. 19. Duplex Unit · The 1-sided copies are fed through this unit before being subjected to the second copy cycle.
M-3
3.
DRIVE SYSTEM
1 2 3
connect
4
5 6 7 14 8
9 13 12 11 10
4002M503AA
Fusing Motor (M2) PC Drum Drive Motor (M21) Scanner Motor (M51) Developing Unit Drive Motor (M1) Upper Vertical Transport / Manual Feed Motor (M6) 6. 1st Drawer Paper Take-Up Motor (M4) 7. Lower Vertical Transport Motor (M7)
1. 2. 3. 4. 5.
8. 1st Drawer Lift-Up Motor (M11) 9. 2nd Drawer Lift-Up Motor (M12) 10. 2nd Drawer Paper Take-Up Motor (M5) 11. Transport Roller Motor (M8) 12. Synchronizing Roller Motor (M9) 13. Turnover Motor (M10) 14. Cleaning Web Drive Motor (M24)
M-4
4.
SEQUENTIAL EXPLANATION
Power Switch ON Start Key ON Half-speed rotation Power Supply Unit Cooling Fan Motor 1 (M16) Power Supply Unit Cooling Fan Motor 2 (M15) Suction Fan Motor (M17) IR Cooling Fan Motor (M52) Fusing Unit Cooling Fan Motor (M23) PH Cooling Fan Motor 2 (M19) PH Cooling Fan Motor 1 (M22) Ventilation Fan Motor (M18) Upper Fusing Roller Heater Lamp (H1) Upper Fusing Roller Heater Lamp (H2) Developer bias (HV) PC Drum Drive Motor (M21) Main Erase Lamp (LA2) Drum Charging Bias (HV) Developing Unit Drive Motor (M1) Exposure Lamp (FL51) Scanner Motor (M51) 1st Drawer Paper Take-Up Motor 1st Drawer Paper Take-Up Sensor (M4) (PC3) Fusing Temperature control Full-speed rotation
Upper Vertical Transport / Manual Feed Motor (M6) Paper Leading Edge Sensor SW1 (PC5) Transport Roller Sensor (PC2) Transport Roller Motor (M8) (PC1) (M9)
Synchronizing Roller Sensor Synchronizing Roller Motor Image Transfer Bias Paper Separator Bias (HV) (HV)
Separator Finger Solenoid Fusing Motor Paper Exit Sensor (M2) (PC9)
(SL4)
4002M601CA
M-5
5.
IMAGE STABILIZATION SYSTEM
Item Purpose Method
The following image stabilization controls are provided to ensure stabilized copy image.
Initial Setup
First correct for AIDC sensor disparity and Set initial values for grid voltage (Vg) and contamination. Then use V control to set developer bias (Vb). initial values for grid voltage (Vg) and developer bias (Vb). Correct for ID drop caused by change in drum sensitivity. Perform V control after every 100 copies. Correct Vg based on cumulative hours of drum rotation.
Short-Term Correction
Long-Term Cor- Correct for drop in surface potential (surrection face fogging) caused by drum deterioration.
Morning CorCorrect for ID drop caused by low drum AIDC sensor contamination, use V conrection (first run sensitivity when copier is first power trol to correct the grid voltage (Vg) and each morning) switch is turned ON (before copier is fully developer bias (Vb). warmed up). Correction After Correct for ID change caused by change When START key is pressed, use V conProlonged Non- in drum sensitivity due to non-usage for at trol to correct Vg and Vb before making Use least two hours in the standby state. the copy. T/C Correction Maintain the developing unit's T/C ratio at Use ATDC to control the toner resupply a constant level.
LD Grid Voltage Vg PC Drum AIDC Sensor Rotation Counter ATDC Sensor Developer bias (Vb)
Toner Replenishing Motor (Main/Sub Hopper)
IN CPU
OUT
Control Panel · Adjust Mode Vg Adjustment ID Setting · Utility Mode Print Density Density Priority Forced Toner Resupply
Table V Setting Toner Resupply Timer
Control Panel · Settings
4002M505CB
M-6
5-1.
AIDC Sensor
The AIDC Sensor is used to detect the toner density and background level on the PC Drum. 1. An LED projects infrared light onto the surface of the PC Drum. 2. A phototransistor detects the intensity of infrared light reflected off the surface of the PC Drum. 3. The phototransistor outputs a voltage corresponding to the intensity of the light reflected back. PC Drum LED Power Supply
Output
GND
4002M506AA
4002M507AA
AIDC Sensor
Image Transfer/Paper Separator Coronas
Toner Density on PC Drum High Low
Light reflected Small Large
Output Voltage High Low
M-7
5-2.
Image Stabilization System Control
1. AIDC Sensor Coarse Adjustment · The following adjustment is made to prevent the AIDC Sensor output voltage from deviating from the specified range due to part-to-part variations in the AIDC Sensor (installation, circuit, deterioration, etc.). · The load resistance value is set with the 4-bit analog switch so that the AIDC Sensor output voltage becomes approximately 1volt in terms of the background level to be erased. 2. AIDC Sensor Fine Adjustment · The following adjustment is made to prevent the AIDC Sensor output voltage from being varied by toner or other contamination of the sensor. · The LED current value of the AIDC Sensor is varied so that the AIDC Sensor output voltage becomes 1 volt in terms of the background level to be erased. CONTROLLED PART AIDC Sensor CONTROL SIGNAL PWB-A PJ7A-7B WIRING DIAGRAM 4-D
3. V Control · Drum deterioration and environmental factors may lead to a drop in drum sensitivity and drum surface potential, resulting in ID loss. · To correct for this, grid voltage (Vg) and bias voltage (Vb) are adjusted to bring the AIDC sensor output voltage into the range between 4.40 V (lighter) to 4.45 V (darker). 4. Grid Voltage Control (Vg) · This control corrects for a loss in drum surface potential caused by drum deterioration (loss of surface material). Correction is made by increasing the Vg by 1 step after 50 hours of drum rotation. CONTROL Grid voltage CONTROL VALUE -366 V to -924 V INITIAL VALUE -600 V
M-8
6.
PC DRUM SECTION
The PC Drum consists of layers of semiconductive materials placed on an aluminum alloy base, on which an electrostatic latent image is formed. PC Drum Charge Holding Layer Carrier Generation Layer
1139M007AA 4002M508AA
Aluminum Bass
6-1.
PC Drum Drive Mechanism
· The PC Drum is rotated by drive from a motor. · The flywheel mounted on the drum shaft functions to smooth out power surges occurring due to backlash in gears. PC Drum Drive Motor (M21)
Rear
PC Drum
Flywheel
Front
4002M509AA
CONTROLLED PART M21
CONTROL SIGNAL PWB-A PJ7A-3A
ON L
OFF H
WIRING DIAGRAM 4-C
M-9
6-2.
Grounding of the PC Drum
The potential on the surface of the PC Drum exposed to the light is grounded to the frame.
PC Drum
Drive Gear
Ground Point
Front
Rear
4002M510AA
Drum Holding Shaft
Ground Plate
M-10
7.
PC DRUM CHARGING SECTION
· The PC Drum Charge Corona has a scorotron grid to deposit a charge evenly across the surface of the PC Drum. · The corona unit has a comb electrode that discharges only toward the grid mesh, thus minimizing the amount of ozone produced. · The grid voltage applied to the grid mesh is varied to select between the Normal and Photo mode. Holder Cleaner
Cleaner Lever
Rear Grid Mesh Comb Electrode Spring
Front
Holder
4002M511AA
CONTROL SIGNAL PC Drum Charger PWB-A PJ12A-9B
ON L
OFF H
WIRING DIAGRAM 5-F
M-11
8.
IMAGE READING SECTION
Light is projected onto the surface of the original and the light reflected off the original is converted to a corresponding electrical signal. 1 2 3 4 5
Rear
11 6 7 Front 8
10
9
4002M512AA
1. 2. 3. 4. 5. 6.
Scanner Exposure Lamp (FL51) Inverter Scanner Motor (M51) IR Cooling Fan Motor (M52) Scanner Reference Position Sensor (PC51)
7. CCD Board (PWB-IA) 8. Lens 9. Original Size Detecting Sensor 10. Scanner Drive Cable 11. 2nd/3rd Mirror Carriage
M-12
8-1.
Exposure Components Section
1
2 4
4002M513AA
3 1. Auxiliary Reflector: Reflects light onto the areas that the Exposure Lamp cannot illuminate when an original does not lie flat on the Original Glass (such as a book). It reduces shadows that would otherwise be transferred to the copy. 2. Inverter: Changes DC into AC to turn ON the Exposure Lamp. 3. Mirror #1: Directs the reflected light from the original over to Mirror #2. 4. Exposure Lamp: A fluorescent lamp is used to illuminate the original.
M-13
8-2.
Exposure Lamp Control
Control to turn ON and OFF the Exposure Lamp is provided by an Exposure Lamp Remote signal output from PWB-B Operation when Power Switch is switched ON 1. The Scanner moves to, and stops at, the shading position. 2. Automatic adjustment of clamp level: Sets the black level when scanning an image. 3. The Exposure Lamp turns ON 4. Automatic adjustment of gain: Sets the maximum white level. 5. The Scanner returns to its home position. 6. The Scanner moves to the shading position to make a shading correction. 7. The Scanner returns to its home position. 8. A black line check is made (only the copier equipped with an EDH). *1 9. The Exposure Lamp turns OFF. *1: Black line check 1. Check that the EDH is lowered. 2. The Scanner moves to, and stops at, the shading position. 3. While returning to the home position, the Scanner checks the EDH scanning range for dust and scratches that could cause a black line. 4. If any dust or scratches are found, the copier gives a warning message.
M-14
Operation when the Start key is pressed (EDH scanning) 1. The Exposure Lamp turns ON 2. The Scanner starts moving to the shading position. 3. A gain adjustment and a shading correction are made at the shading position. 4. The Scanner moves to the original scanning position and starts reading the original. 5. After having read the original, the Scanner moves to the home position. Clamp level Gain : Sets the black level when scanning an image. : Sets the maximum white level.
Power Switch ON Scan Stop Return
Start Key ON
Original Read
Scanner Motor M51
Exposure Lamp FL51
ON OFF Clamp Gain Shading Read
4002M514AA
Gain and Shading Read
CONTROL SIGNAL M51 PWB-IC PJ3IC-1~3 CONTROL SIGNAL FL51 PWB-B PJ5B-1
ON
OFF
WIRING DIAGRAM 10-A WIRING DIAGRAM 17-F
Pulse Output ON L OFF H
M-15
8-3.
Image Processing Process
The IR image processing system is composed of the following blocks. These blocks implement various types of corrective processing. 1. Photoelectric Conversion (CCD Sensor): PWB-IA 2. Analog Processing: PWB-B 3. ODD/EVEN Synthesis: PWB-B 4. Shading Correction: PWB-B
5. Image Monitor: PWB-B 6. Magnification Processing: PWB-B 7. MTF Correction: PWB-B 8. IR Density Correction: PWB-B 9. Octal-to-Binary Converter: PWB-B 10. S/P Conversion: PWB-B Memory: PWB-B
PH: PWB-B/JL/JR
M-16
1. Photoelectric Conversion (CCD Sensor): PWB-IA Light from the Exposure Lamp reflects off the original, passes through mirrors and one lens, and reaches the CCD sensor. The CCD sensor converts the optical data into analog electrical signals. 2. Analog Processing: PWB-B This block eliminates noise from the (ODD and EVEN) analog signals output by the CCD sensor, then converts the result into (ODD and EVEN) 8-bit digital image signals (A/D conversion). 3. ODD/EVEN Synthesis: PWB-B This block synthesizes the ODD and EVEN signals received from the preceding block into a single image-data signal. 4. Shading Correction: PWB-B Corrects shading error introduced by factors such as sensitivity differentials among CCD sensor pixels, uneven Exposure Lamp light distribution, and uneven lens shading. 5. Image Monitor: PWB-B
Monitors the image data. Generates a histogram of the image data, for use during EE/gain adjustment.
6. Magnification Processing: PWB-B Adjusts the image in accordance with the edit function setting (Enlarge/Reduce) made at the control panel. 7. MTF Correction: PWB-B Reduces the image noise contained in the image density data, smooths the image, adds emphasis to borders of characters and lines, and adds sharpness. 8. IR Density Correction: PWB-B Corrects the gradation of the image density data, in accordance with the image quality mode and copy density set at the control panel, so as to produce optimal density and image quality. 9. Octal-to-Binary Converter: PWB-B Converts image density data from 8-bit data to 1-bit data, using an error-dispersing binarization method. 10. S/P Conversion: PWB-B Converts the binarized image-density data into a 4-bit parallel signal, and transmits this signal to the memory section.
M-17
8-4.
(1)
Image Density Control
Auto Exposure Control
· Auto Exposure Control varies the background removal threshold in accordance with the original type (newspaper, photograph, etc.). This helps ensure that only the fogging component in the low-density areas is removed, while retaining the image density of the characters and other high-density areas of the image. · The IR Density Correction section uses the sampled image data to determine the type of the original by the following method. Scanning original fed through EDH Multi Bypass Table : Realtime scanning : Scanning during prescan motion
4002M515CA
Setting of the Image Density Level · The user can select the image density level from among three (Light, Normal, and Dark) by using a User's Choice function. · The Auto Exposure mode can be used only in the Text mode. While, the Manual Exposure mode can be used in all modes of Text, Text/Photo, and Photo.
M-18
1. Scanning Original fed through EDH Realtime Scanning · Realtime scanning is a method in which the image data is sampled during a copy cycle. · The sampled image data is accumulated in the form of a reflectivity histogram. This histogram is used to determine the type of the original and the background removal threshold is calculated as may be necessary. Reflectivity and Histogram · The reflectivity histogram prepared by the CPU of the Auto Exposure Control section is a chart for displaying the distribution of the image data readings. · The reflectivity distribution varies for different types of originals. This copier uses the peak value (*1) of this histogram to compute the best possible background removal threshold. Frequency Position of peak value according to type of original.
Peak Value
Reflectivity Date
100 200
Black
255
Reflectivity Histogram
White
4002M516AA
*1: The peak value represents the density of the original's background. For a two-tone B&W image (such as a word-processor document), where the background is white, the peak would appear all the way to the right, as shown by the dotted line in the above illustration. For a newspaper, which is characterized by a somewhat darker background, the peak would appear at about the position shown by the solid line in the above chart 2. Scanning Original Placed on Glass Scanning during prescan motion · This is a method in which image data is sampled while the Scanner makes a prescan motion. · The sampled image data is accumulated in the form of a reflectivity histogram which is used to calculate the background removal threshold corresponding to the entire surface of the original.
M-19
Given below is the control flow when the Auto Exposure mode is selected. Start Key ON Scanning original fed through EDH Scanning original placed on glass Document The Scanner starts reading the original as it starts moving to the original scanning position. (Prescan motion is started.)
The Scanner starts reading the original. (The copy cycle is started.)
The image data read by the CCD sensor is transmitted (in parallel) from the Shading Correction block to the Histogram block, where the data values are sampled, and the samples are counted in order to generated the reflectivity histogram.
The CPU determines the type of the original based on the histogram, and sets the removal threshold accordingly.
The CPU transmits the threshold value to the IR Density Correction block. This block then corrects the image density of incoming data in accordance with the relation shown below. Output X=a-b
X
X: Image density value after density correction a: 1 : Image density value before density correction -b: Threshold (intercept)
0 x -b
Input
4002M517AA
The gradation curve of the density-corrected data is adjusted in accordance with the Image Quality mode so as to enhance the reproduction of the high-density areas.
The above processing helps retain density detail within characters and other highdensity areas, while removing the fogging component from the low-density areas.
M-20
(2)
Manual Exposure Control
· Manual Exposure Control selects an exposure level variable in nine steps according to the setting made on the control panel by the user when the copier is in the Manual Exposure mode. · According to the manual exposure setting made on the control panel, the CPU of PWB-B transmits a background removal threshold to the IR Density Correction block for density correction. This background removal threshold has been predetermined according to the manual exposure setting.
4002M518CA
The control flow during manual density mode is described below. The user selects the Manual Exposure mode on the Touch Panel and sets the exposure level manually.
The exposure level data is transmitted from MSC via IRC to the Image Processing Board.
The IRC on the Image Processing Board finds the background removal threshold value that corresponds to the exposure level setting.
Next page
M-21
Before page
The threshold value is transmitted from the IRC to the IR Density Correction block. This block then corrects the image density of incoming data in accordance with the relation shown below. Output X=a-b
X
X: Image density value after density correction a: 1 : Image density value before density correction -b: Threshold (intercept)
0 x -b
4002M517AA
Input
For all quality modes other than "Photo," the gradation curve of the density-corrected data is adjusted in accordance with the Image Quality mode so as to enhance the reproduction of the high-density areas. If the Image Quality mode is set to "Photo," however, the gradation curve is designed to promote image smoothness, even density, and low noise. In this case, the curve is adjusted in accordance with the manual density setting, as illustrated below. Output
X
Dark
Light
0 x
4002M519CA
Input
The above processing enables the user to select copy density effectively for any of the image quality modes.
M-22
8-5.
(1)
Scanner and Mirrors Carriage Movement Mechanism
Scanner Movement Mechanism
· The Scanner is driven by the Scanner Motor at a speed appropriate to the set zoom ratio with reference to the speed in the full size mode. · The Scanner is detected at its home position by the Scanner Reference Position Sensor. (2) 2nd/3rd Mirrors Carriage Movement Mechanism
The 2nd/3rd Mirrors Carriage moves at a speed half that of the Scanner, thereby keeping constant the optical path length between the original and the CCD Sensor. 1 2 3
Rear
4 5 Front 6
4002M520AA
1. 2. 3. 4.
2nd/3rd Mirror Carriage Scanner Scanner Motor (M51) Scanner Reference Position Sensor (PC51)
5. CCD Sensor 6. Scanner Drive Cable
M-23
8-6.
Scanner Motor Drive Control
· The speed at which the Scanner is moved is controlled by varying the period of the motor drive pulse that is timed with the reference clock.
High Speed
Low Speed Period · The distance over which the Scanner travels is controlled by the number of motor drive pulses that correspond to each paper size and zoom ratio. CONTROL SIGNAL M51 PWB-IC PJ3IC-1~3 ON OFF WIRING DIAGRAM 10 -A
Pulse Output
M-24
9.
MEMORY SECTION
The Memory section stores the image density data output from the IR section to effectively carry out data transmission to the Printer section.
9-1.
Image Processing Process
The binary image data transmitted from the Image Processing Board of the IR section undergoes the following processes before being transmitted to the PH section. IR Section Memory Section
1. Image Memory 2. Compression Circuitry
3. Encoded memory 4. Expansion Circuitry 5. Output Image memory
PHC Section 1. Input Image Memory · Stores binary image data. · Consists of SDRAM, and is capable of storing about one A5 page of copy data. 2. Compression Circuitry · Reads the binary data from the Image Memory block, one line at a time, and further compresses it. · Use of this compression step makes it possible for the next block (Encoded Memory block) to hold data. 3. Encoded Memory · Stores the encoded (compressed) data received from the previous block. · Consists of SDRAM. Capable of holding data for up to about 100 pages of standard A4 originals. 4. Expansion Circuitry · Performs image rotation, shift, erase, and other editing functions for subsequent output to the printer. 5. Output Image Memory · Stores the expanded image data. It is then output to the PHC section.
M-25
10. Original Size Detecting Section
The original size detecting sensors fixed in the optical section are used to determine the size of the original in the Auto Paper or Auto Size mode. 1 2 3 4
Rear
Front
7
6 5
4002M521AA
1. Original Cover Detecting Sensor PC52 2. Original Cover Detecting Sensor FD1 PC53 3. Original Cover Detecting Sensor FD2 PC54 4. Original Cover Detecting Sensor FD3 PC55
5. Size Reset Switch S51 6. Original Cover Detecting Sensor CD2 PC57 7. Original Cover Detecting Sensor CD1 PC56
10-1.
Original Size Detecting Operation
Each photo receiver of the original size detecting sensors responds to the light, which is emitted by the corresponding LED and reflected off the original, of a given level of intensity. If the intensity of the reflected light exceeds the given level, the size detecting board determines that there is an original. Original Original Glass LED Photo Receiver
4002M522AA
M-26
10-2.
Original Size Detecting Sensors Locations
· The original size detecting sensors are located in the following positions to enable them to detect different sizes of the original. · Adding optional original size detecting sensors increases the number of original sizes that can be detected by the system. FD1 Metric Areas Inch Areas Standard Optional FD1 Rear FD2 Standard Standard FD2
11 X 8.5 8.5 X 5.5 8.5 X 11 8.5 X 14 8.5 X 13
FD3 Optional Optional
CD1 Standard Standard FD3
11 X 17
CD2 Optional Optional
1
2
3
4 5
8.5 X 5.5 A5L
A4L
6
B4L, B5C A3L, A4C
8.5 X 11, 8.5 X 13, 8.5 X 14 11 X 17, 11 X 8.5
7 8
A5L B5C A4C
A4L
B4L
A3L
4002M605AA
CD1
CD2
Front
FD2, FD3 Sensor Locations FD2 FD3
B
C
D
E
4002M604AA
M-27
10-3.
Original Size Detection
The Original Size Detecting Board determines the correct original size based on the combination of statuses of the original, either present or absent, as detected by the original size detecting sensors. Metric Area Original Size A3L B4L A4L A5L A4C 8.5 × 11 11 × 17 8.5 × 14 8.5 × 13 11 × 8.5 Need Optional Sensors No No No No No No Yes Yes Yes Yes FD1 1 q q q q q q q q q q 2 q q q q q q q FD2 3 q q q q q q FD3 (Optional) 4 (q) (q) (q) (-) (-) (-) (q) (q) (q) (-) 5 (q) (q) (-) (-) (-) (-) (q) (q) (-) (-) 6 q q q q q CD1 7 q q q q CD2 (Optional) 8 (q) (-) (-) (-) (q) (-) (-) (-) (-) (-)
q: Original Present
-: Original Not Present
( ): Optional Sensor are Mounted
Inch Area - Standard Original Size 11 × 17 8.5 × 14 8.5 × 11 11 × 8.5 B4L B5C 8.5 × 13 8.5 × 5.5 A3L A4L A4C Need Optional Sensors No No No No No No Yes Yes Yes Yes Yes FD1 (Optional) 1 (q) (q) (q) (q) (q) (q) (q) (q) (q) (q) (-) 2 q q q q q q q l FD2 3 q q q q q q l FD3 (Optional) 4 (q) (q) (-) (-) (q) (-) (q) (-) (q) (-) (q) 5 (q) (q) (-) (-) (q) (-) (-) (-) (q) (-) (q) 6 q q q q q l CD1 7 q q q l CD2 (Optional) 8 (-) (-) (-) (-) (-) (-) (-) (-) (q) (-) (q)
q: Original Present
-: Original Not Present
( ): Optional Sensor are Mounted
M-28
10-4.
1
Original Size Detection Timing
When the Original Cover is raised to an angle of 15° or more (Original Cover Detecting Sensor is deactivated). When the Original Cover is lowered to an angle of 15° or less (Original Cover Detecting Sensor is just activated) and the Size Reset Switch is actuated. Or, when the Start key is pressed with the Original Cover Detecting Sensor in the deactivated state. When the Original Cover is raised and the Size Reset Switch is just deactuated from actuated state.
Takes size readings Affirms size readings
2
3 4
Resets size readings
Unable to take A notice is given to the user if the Start key is pressed with the Original size readings Cover not raised to an angle of 15° or more in a size reset condition.
:Numbers 1 through 4 are enabled when the EDH is mounted; only numbers 1 and 2 are enabled when the Original Cover is mounted.
Original Cover Detecting Sensor PC52
Size Reset Switch S51
4002M524AA
CONTROL SIGNAL PC52 PWB-B PJ5B-2
Blocked L ON H
Unblocked WIRING DIAGRAM H OFF L 13 - C WIRING DIAGRAM 7-I
CONTROL SIGNAL S51 PWB-B PJ306B-7
M-29
11. PH SECTION
Image data sent from the memory section is corrected and, based on the corrected data, a laser light is projected onto the surface of the PC Drum to form a corresponding latent image. 1 2 3
4
Rear
10
5 6
7 Front 8
4002M525AA
9
1. 2. 3. 4. 5.
Lenses Return Mirror Cylindrical Lens Beam Interval Correction Motor (M20) LD Drive Board R (PWB-JR)
6. LD Drive Board L (PWB-JL) 7. Polygon Mirror 8. Polygon Motor (M3) 9. SOS Sensor Board (PWB-JS) 10. SOS Mirror
M-30
11-1.
Image Processing Process
The PH image processing system is composed of the following blocks. These blocks implement a variety of types of corrective processing, as described below. Memory: PWB-B
1. Erasure of Outside Area : PWB-B 2. Bit Expansion : PWB-B 6. Two-Beam Position Correction : PWB-B
3. Image Density Smoothing : PWB-B 4. Correction 5. Line Memory 7. D/A Conversion : PWB-B : PWB-B : PWB-B
8. LIMOS Circuitry 9. Laser Emission
: PWB-JL, JR : PWB-JL, JR
M-31
1. Erasure of Outside Area: PWB-B Erases the area outside of the image area, so as to prevent firing of the laser over non-image areas. 2. Bit Expansion: PWB-B If image quality is set to photo mode, this block expands binary data values into 8-bit data values. (If image quality is set to the Text mode, the block outputs binary image density data values without change.) 3. Image Density Smoothing: PWB-B The edge data is filtered in the Text mode and data is converted, thereby reducing jaggies that would otherwise occur along the edges. 4. Correction: PWB-B Adjusts data so that the copied image's gradation characteristics will be proportional to the gradation characteristics of the original. Adjustment is made by selecting the appropriate gamma look-up table, then using the table data to convert image density values into appropriate laser intensity values. 5. Line Memory: PWB-B Corrects for differences in data transfer frequency with respect to PH line memory. 6. Two-Beam Position Correction: PWB-B The amount of positional deviations in the main and sub scanning directions of the two laser beams is detected to make the necessary corrections. · Main scanning direction: Correction is made by advancing or retarding the laser emission start timing signal. · Sub scanning direction: Correction is made by turning the stepping motor of the PH. 7. D/A Conversion: PWB-B Converts the 8-bit laser intensity data values into analog laser intensity voltages. 8. LIMOS Circuitry: PWB-JL, JR Activates the APC (Auto Power Control) function that controls the current flowing through the LD for each line; activates the ACC (Auto Current Control) function that stabilizes the drive current for each dot. 9. Laser Emission: PWB-JL, JR · Fires laser onto PC drum in accordance with the emission level given by the LIMOS block. · The copier employs 2 laser beams, and therefore prints two lines at a time.
M-32
11-2.
Laser Emission Timing (SOS Signal)
The laser diode is forced to turn ON to project the laser beam onto the SOS Sensor Board, which generates an SOS signal. 1 2
Rear
3 8 4
5 Front 6
4002M526AA
7
1. 2. 3. 4.
Lens Cylindrical Lens LD Drive Board R (PWB-JR) LD Drive Board L (PWB-JL)
5. 6. 7. 8.
Beam Interval Correction Motor (M20) Polygon Mirror SOS Sensor SOS Mirror
M-33
Relation between laser emission timing and SOS signal The light path of the laser beam changes as the Polygon Mirror turns. The SOS signal synchronizes the rotation of the Polygon Mirror with the laser emission timing. A. LD force-ON The laser diode is forced ON to output an SOS signal.
4002M589AA
B. SOS signal output A laser beam strikes the SOS Sensor Board and sensor A determines the SOS signal output timing. After the timing has been determined, the laser beam is turned OFF.
4002M590AA
SOS Sensor Board
A B C
Sensor A output only is used.
4002M591AA
SOS signal output timing
C. Start of image data output The laser emission start timing is controlled according to the size of the image to be output.
4002M592AA
D. End of image data output The laser radiation area is controlled according to the size of the image to be output. After the image area has been covered, the laser beam is turned OFF.
4002M593AA
Laser beam area according to the image data
Laser Diode (LD)
ON OFF
SOS Signal
H L A Sequence B C D A
4002M594AA
M-34
12. DEVELOPING UNIT SECTION
The Developing Unit agitates and triboelectrically charges toner so that it sticks to the electrostatic latent image formed on the surface of the PC Drum, then changing the image to a visible, developed one. 1 2 3
4
5 15 14 13 12 6
8 11 10 9
7
4002M527AA
1. Toner Bottle 2. Toner Bottle Holder 3. Toner Bottle Home Position Sensor PC21 4. Main Hopper Toner Replenishing Motor M13 5. Sub Hopper Toner Empty Detecting Lever 6. Sub Hopper Toner Agitating Lever 7. Toner Regulator
8. ATDC Sensor UN2 9. Developer Conveying /Agitating Screw 10. Bucket Roller 11. Magnet Sheet 12. Sleeve/Magnet Roller 13. Doctor Blade 14. Developer Scattering Prevention Plate 15. Sub Hopper Toner Replenishing Roller
M-35
12-1.
Developing Unit Drive Mechanism
The rollers and screws are driven through a gear train from the motor.
2
Front
1
3 4
5
Rear 6 7
4002M528AA
1. 2. 3. 4.
Coupling Gear Sub Hopper Toner Agitating Lever Developer Conveying/Agitating Screw Bucket Roller
5. Sleeve/Magnet Roller 6. Toner Conveying Coil 7. Developing Unit Drive Motor M1
CONTROL SIGNAL M1 PWB-A PJ7A-6A
ON L
OFF H
WIRING DIAGRAM 4-C
M-36
12-2.
Sleeve/Magnet Roller
· The Sleeve/Magnet Roller, which consists of an outer sleeve roller and an inner magnet roller, conveys developer to the point of development. · The magnetic force of the magnet roller at the point of development is the strongest so that the developer brush stands straight up to deliver the greatest amount of toner to the point of development. PC Drum Sleeve Roller Developer Pole
Magnetic flux
Magnet Roller
1177M060AA
12-3.
Doctor Blade
The Doctor Blade controls the height of the developer brush, ensuring that the developer on the Sleeve/Magnet Roller levels out. Doctor Blade
Sleeve/Magnet Roller
1156M017AA
M-37
12-4.
Developing Bias
· A developing bias voltage (Vb) is applied to the sleeve roller to prevent a foggy background on the copy. · The amount of toner attracted onto the surface of the PC Drum depends on how much lower the PC Drum surface potential (Vi) is than Vb (i.e., potential difference). When the potential difference is large, a greater amount of toner is attracted. When the potential difference is small, a smaller amount of toner is attracted. Front
PC Drum
Rear Sleeve/Magnet Roller
4002M529AA
Developing Bias Terminal
CONTROL SIGNAL Developing Bias PWB-A PJ12A-8B
ON L
OFF H
WIRING DIAGRAM 4-G
M-38
12-5.
ATDC Sensor
The ATDC Sensor detects the toner-to-carrier ratio (T/C) of the developer in the Developer Mixing Chamber.
Developer Conveying/Agitating Screw ATDC Sensor UN2
4002M530AA
CONTROL SIGNAL UN2 (1) PWB-A PJ7A-10B
REFERENCE T/C RATO 5.0 %
STANDARD OUTPUT VOLTAGE 2.27 V
WIRING DIAGRAM 4-E
ATDC Sensor Automatic Adjustment
The reference value for the ATDC Sensor is automatically adjusted as detailed below using the ATDC Sensor Automatic Adjustment mode.
With the copier set in the ATDC Sensor Automatic Adjustment mode, press the Start key.
The developer is mixed.
The ATDC Sensor converts the reference T/C (5.0 %) to a corresponding voltage value and outputs it.
Is the output voltage 2.27 V? YES The voltage input to the ATDC Sensor from the Master Board at this time is fixed as the reference voltage. NO The voltage input to the ATDC Sensor from the Master Board is varied. 2.27 V or more: Decrease the voltage. Less than 2.27 V: Increase the voltage.
N O T E · If the automatic adjustment mode is run at a time when the starter has not been changed, it can result in a wrong T/C reference value being set by the copier. Avoid casual use of this mode. · If the setting value has been cleared as a result of the Memory Board being replaced, return the value of "ATDC Control" under the Adjust mode back to the original one before the board was replaced.
M-39
12-6.
Toner Replenishing Control
Toner Replenishing Control by ATDC Sensor The ATDC Sensor samples T/C for each scan motion and the copier compares the reading with the reference T/C to determine the appropriate amount of toner to be replenished. Toner Replenishing Large amount Small amount Fixed amount None Conditions The sensor reading is lower than the reference T/C ratio [4.5 %] by 0.5 % or more. The sensor reading is lower than the reference T/C ratio [4.5 %] by less than 0.5 % The sensor reading is higher than the reference T/C ratio [4.5 %] by less than 0.5 % The sensor reading is higher than the reference T/C ratio [4.5 %] by 0.5 % or more. Amount Replenished Approx. 216 mg Approx. 101 mg Approx. 22 mg Approx. 0 mg
The amount of toner replenished varies according to the paper size (given in the table are figures for A4).
12-7.
Toner Supply Hole Covering/Uncovering Mechanism
The Toner Supply Hole is covered to prevent toner from dropping into the inside of the copier when the PC Unit is slid out of the copier. Main Hopper holder Uncovering the Toner Supply Port
Cover Plate
P