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GENERAL
1. SAFETY INFORMATION
This copy machine is a digital copy machine which operates by means of a laser. There is no possibility of danger from the laser, provided the copy machine is operated according to the instructions in this manual provided. 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 copy machine is certified as a Class 1 laser product. This means the copy machine does not produce hazardous laser radiation. LUOKAN 1 LASERLAlTE KLASS 1 LASER APPARAT 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. For United States Users: Laser Safety This copy machine is certified as a Class 1 Laser product under the U.S. Department of Health and Human Services (DHHS) Radiation Performance Standard according to the Radiation Control for Health and Safety Act of 1968. This means that the copy machine does not produce hazardous laser radiation. CDRH Regulations The Center for Devices and Radiological Health (CDRH) of the U.S. Food and Drug Administration implemented regulations for laser products on August 2, 1976. Compliance is mandatory for products marketed in the United States. The label shown below indicates compliance with the CDRH regulations and must be attached to laser products marketed in the United States. WARNING: Use of controls, adjustments or performance of procedures other than those specified in this manual may result in hazardous radiation exposure. Internal Laser Radiation Maximum Radiation Power: 15mW x 2 Wave Length: 780nm
G-1
For European Users: WARNING: 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 15mW and the wavelength is 780nm. (Two provided.) For Denmark Users: ADVARSEL Usynlig laserstråling ved åbning, når sikkerhedsafbrydere er ude af funktion. Undgå udsættelse for stråling. Klasse 1 laser produkt der opfylder lEC825 sikkerheds kravene. For Finland, Sweden Users: VAROlTUS Laitteen Käyttäminen muulla kuin tässä käyttöohjeessa mainitulla tavalla saattaa altistaa käyttäjän turvallisuusluokan 1 ylittävälle näkymättömälIe lasersäteiylle. VARNING Om apparaten används på annat sätt än i denna bruksanvisning specificerats, kan användaren utsättas för osynlig laserstrålning, som överskrider gränsen för laser klass 1. For Norway Users: ADVERSEL Dersom apparatet brukes på annen måte enn spesifisert i denne bruksanvisning, kan brukeren utsettes for unsynlig laserstråling som overskrider grensen for laser klasse 1. Dette en halvleder laser. Maksimal effeckt till laserdiode er 15mW og blgelengde er 780nm.
G-2
Laser Safety Labels Laser safety labels are attached to the outside of the copy machine as shown below.
For Europe
For United States
1155O698CB 1155O653AA
1155O699EA
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Label inside copy machine The following laser safety label will be attached inside the copy machine as shown below.
1155G002AA
G-4
1155SBG000D
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.
G-5
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 instruction." Germany only VORSICHT! "Austausch nur durch denselben oder einen vom Hersteller empfohlenen, gleichwertigen Typ. Entsorgung gebrauchter Batterien nach Angaben des Herstellers."
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1155SBG0200A
2. SPECIFICATIONS 2
TYPE PHOTOCONDUCTOR ORIGINAL SCANNING RESOLUTION SCANNING DENSITY PRINT DENSITY COPYING SYSTEM PAPER FEEDING SYSTEM : : : : : : : Console (with Stationary Platen) Organic Photoconductor Lens Reduction Type CCD Line Sensor 400dpi, 600dpi 400dpi × 400dpi, 600dpi × 600dpi 400dpi × 400dpi, 600dpi × 600dpi Electrostatic Dry Powdered Image Transfer to Plain Paper : 4-Way system Multi Bypass Table: 50 sheets of paper 1st and 2nd Drawer: Each holding up to 500 sheets of paper 3rd Drawer: Holding up to 2,500 sheets of paper
EXPOSURE SYSTEM : Mirror Scanning, Slit Exposure DEVELOPING SYSTEM : New Micro-Toning System CHARGING SYSTEM : Comb Electrode DC Negative Corona with Scorotron System IMAGE TRANSFER : Visible Image Transfer by means of a Single-Wire DC SYSTEM Negative Corona with Corotron System PAPER SEPARATING : Single-Wire AC Corona with Corotron System, plus SYSTEM Paper Separator Finger FUSING SYSTEM : Heat Roller PAPER DISCHARGING : Charge Neutralizing Brush SYSTEM MAXIMUM ORIGINAL : Metric-A3L; Inch-11" × 17"L (L: Lengthwise) SIZE COPY MEDIUM
Paper Source Plain paper (60 to 90 g/m2) Medium Transparencies Thick paper (90 to 157 g/m2) Recycled paper Dimensions Maximum (Width × Length) Minimum (Width × Length) 1st to 2nd Drawer r r 297 × 432 mm 140 × 182 mm 3rd Drawer r r A4C 8-1/2" × 11"C Multi Bypass Table r r r r 297 × 432 mm 100 × 140 mm
r : Permissible : Not permissible C: Crosswise
G-7
MULTIPLE COPIES WARMING-UP TIME FIRST COPY TIME
: 1 to 999 : 7 min. or less with room temperature of 20°C and rated power voltage : A4C or 8-1/2" × 11"C: 6.0 sec. or less (in Full size Mode using 1st Drawer)
CONTINUOUS COPY SPEED (copies/min.) Fed from 1st Drawer/Memory Mode:
Area Zoom Ratio Size A3L A4L A4C B4L ×1.000 35 47 62 40 Area Zoom Ratio Size 11" × 17" (L) 8-1/2" × 11" (L) 8-1/2" × 11" (C) 8-1/2" × 14" (L) ×1.000 35 48 62 41
Metric
Inch
L: Lengthwise; C: Crosswise ZOOM RATIOS
Area Mode Full Size Reduction Metric ×1.000 ×0.816 ×0.707 ×0.500 ×1.154 ×1.414 ×2.000 Inch ×1.000 ×0.785 ×0.733 ×0.647 ×0.500 ×1.214 ×1.294 ×1.545 ×2.000
Fixed
Enlargement Variable
25% to 400% (in 0.1% increments)
LENS EXPOSURE LAMP FUSING TEMPERATURE
: Through Lens (F = 4.0, f = 48 mm) : Fluorescent Lamp : 195°C
POWER/CURRENT CONSUMPTION (Copier Only)
Voltage 115 V 120 V 127 V 220 V 240 V Exposure Lamp (Rating) Fusing Heater Lamp (Rating) 100V Upper: 700W Lower: 400W Max. Power Consumption
24 V 20 W
1530 W 1830 W
POWER REQUIREMENTS
: 115 V, 120 V, 127 V, 220-240 V; 50/60 Hz
G-8
ENVIRONMENTAL CONDITIONS
Temperature Humidity Ambient Illumination Levelness 10 to 32°C with a fluctuation of 10°C or less per hour 15 to 85% RH with a fluctuation of 10% RH or less per hour 3,000 lux or less 1° (1.75 mm/100 mm)
DIMENSIONS (Copier Only) WEIGHT
: Width .... 745 mm (30-1/2") Depth .... 735 mm (29") Height ... 980 mm (38-1/2") : 200 kg (441lbs) (Copier Only) *excluding the Copy Tray, starter, toner, and paper
G-9
1155SBG0300A
3. PRECAUTIONS FOR INSTALLATION 3
s Installation Site
To ensure safety and utmost performance of the copier, the copier should NOT be used in a place: q Where it will be subjected to extremely high or low temperature or humidity. q Which is exposed to direct sunlight. q Which is in the direct air stream of an air conditioner, heater or ventilator. q Which puts the operator in the direct stream of exhaust from the copier. q Which has poor ventilation. q Where ammonia gas might be generated. q Which does not have a stable, level floor. q Where it will be subjected to sudden fluctuations in either temperature or humidity. If a cold room is quickly heated, condensation forms inside the copier, resulting in blank spots in the copy. q Which is near any kind of heating device. q Where it may be splashed with water. q Which is dirty or where it will receive undue vibration. q Which is near volatile flammables or curtains.
s Power Source
q If any other electrical equipment is sourced from the same power outlet, make
sure that the capacity of the outlet is not exceeded.
q Use a power source with little voltage fluctuation. q Never connect by means of a multiple socket any other appliances or machines
to the outlet being used for the copier.
q 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? q Ensure that the copier does not ride on the power cord or communications cable
of other electrical equipment, and that it does not become wedged into or underneath the mechanism. Use an outlet with a capacity of 115/120/127V, or 220-240V.
s Grounding
To prevent receiving electrical shocks in the case of electrical leakage, always ground the copier. q Connect the grounding wire to: · The ground terminal of the outlet. · A grounding contact which complies with the local electrical standards. q Never connect the grounding wire to a gas pipe, the grounding wire for a tele-
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phone, or a water pipe.
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1155SBG0400A
4. PRECAUTIONS FOR USE
To ensure that the copier is used in an optimum condition, observe the following precautions. q Never place a heavy object on the copier or subject the copier to shocks. q Insert the power plug all the way into the outlet. q Do not attempt to remove any panel or cover which is secured while the copier is making copies. q Do not turn OFF the Power Switch while the copier is making copies. q Provide good ventilation when making a large number of copies continuously. q Never use flammable sprays near the copier. q If the copier becomes inordinately hot or produces abnormal noise, turn it OFF and unplug it. q Do not turn ON the Power Switch at the same time when you plug the power cord into the outlet. q When unplugging the power cord, do not pull on the cord; hold the plug and pull it out. q Do not bring any magnetized object near the copier. q Do not place a vase or vessel containing water on the copier. q Be sure to turn OFF the Power Switch at the end of the workday or upon power failure. q Use care not to drop paper clips, staples, or other small pieces of metal into the copier.
s Operating Environment
The operating environmental requirements of the copier are as follows. · Temperature: 10°C to 32°C with a fluctuation of 10°C per hour · Humidity: 15% to 85% RH with a fluctuation of 10% RH per hour
s Power Requirements
The power source voltage requirements are as follows. · Voltage Fluctuation: AC115/120/127/220-240V ±10% (Copying performance assured) +6%, 10% (AC127V Areas only) 15% (Paper feeding performance assured) · Frequency Fluctuation: 50/60 Hz ±0.3%
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1155SBG0500A
5. HANDLING OF THE CONSUMABLES
Before using any consumables, always read the label on its container carefully. q Use the right toner. The applicable copier model name is indicated on the Toner Bottle. q Paper can to be easily damaged by dampness. To prevent absorption of moisture, store paper, which has been removed from its wrapper but not loaded into the Drawer, in a sealed plastic bag in a cool, dark place. q Keep consumables out of the reach of children. q Do not touch the PC Drum with bare hands. q Store the paper, toner, and other consumables in a place free from direct sunlight and away from any heating apparatus. q 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. q If your hands become soiled with toner, wash them with soap and water immediately. q Do not throw away any used consumables (PC Drum, starter, toner, etc.). They are to be collected.
NOTE Do not burn, bury in the ground, or throw into the water any consumables (PC Drum, starter, toner, etc.).
1155SBG0600A
6. OTHER PRECAUTIONS
The Printerhead of this copier uses a laser diode that emits a laser beam. Use the following precautions when performing service jobs at the users' premises. q When a service job needs to be performed in the laser beam path, such as when working around the printerhead and PC Drum, be sure first to turn the copier OFF. q 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. · At the job site, select a place that is as far as possible away from the users and that is enclosed by walls. · Do not bring a highly reflective tool into the laser beam path during the service job.
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1155SBG0700A
7. SYSTEM OPTIONS
1
2 4
1145M035AA
8
1138O525AA
3
4487U043AA
7
5
4487U025AA
1155O013DA
6 1. 2. 3. 4. Data Terminal DT-103 Plug-In Counter Electronic Document Handler EDH-1 Data Controller D-102 5. 6. 7. 8. Large Capacity Cassette C-304 Finisher FN-3 16MB Memory Hard Disk Drive Kit
G-14
MECHANICAL, ELECTRICAL
1. CROSS-SECTIONAL VIEW
2 1 36 35 34
3
4
5 6 7
8
9
10
11
12 13 14 15 B
37 D 33 32 31 E 30 29 28 F 27 G 26
38 39
40
16
H
42 41
I
C 43 45 46 48 44 47 J
A 17 K L 18 19 M N 20 21 O P 22
49
25
24
23
1155G001AA
M-1
1. Mirror #3 2. Mirror #2 3. Mirror #1 4. Exposure Lamp (FL1) 5. Web Wind-up Roller 6. Web Coat/Transfer Roller 7. Web Roller 8. PH Unit 9. Original Detection Filter 10. Lens 11. Main Erase Lamp (LA1) 12. PC Drum Charger 13. PC Drum 14. Developing Unit 15. Transport Roller 16. Manual Feed Roller 17. Vertical Transport Roller #1 18. 1st Take-Up Roller Section 19. Vertical Transport Roller #2 20. 2nd Take-Up Roller Section 21. Vertical Transport Roller #3 22. 3rd Take-Up Roller Section 23. 3rd Drawer 24. Lower Paper Exit Roller 25. Duplex Unit Entry Roller 26. Turnover Transport Roller #2 27. Lower Paper Exit Switching Lever 28. Lower Paper Exit Roller 29. Duplex Unit Entry Roller 30. Turnover Transport Roller #2 31. Turnover Transport Roller #1 32. Lower Fusing Roller Separator Finger 33. Upper Paper Exit Switching Lever 34. Upper Paper Exit Roller 35. Fusing Transport Roller 36. Upper Fusing Roller Separator Finger 37. Upper Fusing Roller Heater Lamp (H1) 38. Upper Fusing Roller
39. 40. 41. 42. 43. 44. 45. 46. 47. 48. 49.
Suction Unit Cleaning Blade Lower Fusing Roller Lower Fusing Roller Heater Lamp (H2) PC Drum Separator Finger Duplex Unit Horizontal Transport Roller #2 Transfer/Separator Charger Timing Roller Duplex Roller #1 Duplex Roller #2 Duplex Unit Horizontal Transport Roller #1
-Jam Detection SensorsA. Manual Feed Paper Empty Sensor (PC6) B. Transport Roller Sensor (PC1) C. Paper Leading Edge Sensor (PC2) D. Paper Exit Switch (S10) E. Turnover Feed Entry Sensor (PC11) F. Turnover/Exit Sensor (PC14) G. Turnover Feed Jam Sensor (PC57) H. Duplex Unit Horizontal Transport Entry Sensor (PC13) I. Duplex Unit Horizontal Transport Jam Sensor (PC56) J. Duplex Unit Horizontal Transport Sensor (PC12) K. 1st Drawer Paper Take-Up Sensor (PC32) L. Vertical Transport Sensor #1 (PC36) M. 2nd Drawer Paper Take-Up Sensor (PC33) N. Vertical Transport Sensor #2 (PC37) O. 3rd Drawer Paper Take-Up Sensor (PC34) P. Vertical Transport Sensor #3 (PC38)
M-2
1155SBM0200A
2. COPYING PROCESS 2
1. Photoelectric Conversion Section 2. IR Image-Processing Section 3. Memory Section 7. Drum Charging 4. PH Image-Processing Section 5. Laser Exposure
14. Main Erase
13. Cleaning
6. PC Drum
8. Image Development
17. Upper Paper Exit Switch
16. Fusing
15. Transport
11/12. Separation
10. Image Transfer
9. Manual Feed
20. Lower Paper Exit Switch
18. Turnover
19. Duplex Unit
9. Paper Feed
1155M079CB
1. Photoelectric Conversion Section q The exposure lamp directs light onto the original. The light reflected from the original is directed and resized by the various mirrors and lenses so as to produce a reduced-size image on the CCD sensor. q The CCD sensor converts the reduced image into an electrical signal. The signal is output to the IR image-processing section. 2. IR Image-Processing Section q This section converts the electric signal from the photoelectric conversion section into an 8-bit digital image signal (A/D conversion), applies appropriate correction processing, and outputs the result to the memory section. 3. Memory Section q This section compresses the data received from the IR Image-Processing Section. The section can store data for up to 200 A4-size sheets (assuming a B/W ratio of 6%). Stored data can then be expanded in various ways in accordance with selected functions. 4. PH Image-Processing Section q This section applies correction processing to the digital signal output from the memory section, then converts the result (D/A conversion) into an electrical signal that controls the output level from the laser diode (LD). 5. Laser Exposure q The laser beam emitted from the LD strikes the surface of the PC drum, creating a latent (electrostatic) image. 6. PC Drum q The drum is an aluminum cylinder coated with photosensitive material. The action of the laser generates an electrostatic pattern (latent image) onto the drum surface. 7. Drum Charging q A scorotron charger (with 2 comb electrodes) generates a negative DC charged layer on the surface of the drum. 8. Image Development q Negatively charged toner from the developer mixing chamber adheres to the latent image on the drum surface, creating a visible image. q AC/DC bias voltage is applied to the sleeve roller to prevent toner from adhering to the white background areas of the image. 9. Paper Feed q This section feeds sheets from the appropriate feed source (feed drawer or manual-feed tray).
M-3
10. Image Transfer q A single-wire transfer corona generates a positive DC corona discharge on the back side of the sheet being fed. This causes the visible image on the PC drum to transfer onto the front side of the paper. 11. Separation (1) q A single-wire separator corona generates AC and negative DC corona discharges at the backside of the sheet so that the sheet can be easily separated from the drum. 12. Separation (2) q The sheet is removed from the drum by the PC-Drum Separation Fingers. 13. Cleaning q The cleaning blade removes the toner remaining on the drum. 14. Main Erase q The drum is exposed to light to remove any residual surface charge. 15. Transport q The suction belt moves the sheet to the fusing section. 16. Fusing q Heat and pressure supplied by the upper and lower fusing rollers cause the toner to fuse to the sheet. 17. Upper Paper Exit Switch q The switching mechanism determines whether the sheet is ejected to the copy tray or transported to the turnover section. 18. Turnover q This section flips the sheet and directs it onward. The sheet is then either ejected (if a one-side copy) or else transported to the duplex unit (if the sheet must be passed through again for duplex copying). 19. Duplex Unit q Stores (following first-side copy) a fixed number of sheets that have been ejected. Then refeeds the sheets for copying onto the other side. 20. Lower Paper Exit Switch q This switch operates only during folded sorting mode. The solenoid comes ON, causing paper to eject with no turnover.
M-4
1155SBM0300A
3. DRIVE SYSTEM 3 4
A
C 4 D 2 3
E
7
6 5
1 H
B 8 F 9
13 11 12
G 10
1155M052AA
M-5
A. PC Drum Drive Motor (M2) : Drives the PC Drum and the Suction Belt. 4 1. Suction Belt Drive Gears 2. PC Drum Drive Docking Shaft and 2nd and 3rd Mirror Carriage. B. Scanner Motor (M31) : Drives the scanner 3. Scanner Drive Pulleys C. Developing Unit Drive Motor (M31) : Drives the Developing Unit. 4. Developing Unit Drive Coupling Gears D. Synchronizing Motor (M5) : Drives the Synchronizing Rollers. 5. Synchronizing Rollers Coupling Gears E. Transport Motor (M23) : Drives the Transport Roller and Manual-Feed Roller. 6. Transport Roller Coupling Gears 7. Manual Feed Paper Take-Up Clutch (CL1) F. Vertical Transport Motor (M22) :Drives the Vertical Transport Rollers and the Duplex Unit Horizontal Transport Rollers #3/4. 8. Duplex Unit Horizontal Transport Roller Coupling Gears 2 9. Vertical Transport Roller Drive Gears G. Paper Take-Up Motor (M21) : Drives the Take-Up Rollers. 10. Take-Up Roller Drive Gears H: Fusing Motor (M3) : Drives the Fusing Unit, the Upper Paper-Exit Roller, and the Duplex Unit Horizontal Transport Rollers #1/2. 11. Duplex Unit Horizontal Transport Roller Coupling Gears 1 12. Upper Paper Exit Roller Drive Gears 13. Fusing Unit Drive Gears
M-6
1155SBM0400A
4. OPERATING SEQUENCE
A Power cord is plugged into power outlet. Power source outputs stabilized DC24V power supply to the dehumidifying heaters. (LCC Tray) Note: Only if the Paper Dehumidifying Switch (S8) is ON.
ON
B ON
Power Switch is turned ON. DC Voltage output
ON
Control panel display Approx. 200ms ON Upper Fusing Roller Heater Lamp (H1) ON Approx. 200ms ON Polygon Motor (M4)
Lower Fusing Roller Heater Lamp (H2)
ON Approx. 100ms ON PC Drum Cooling Fan Motor (M17) ON CCD Cooling Fan Motor (M32) ON Ozone Ventilation Fan Motor (M12) Half-speed ON Suction Fan Motor (M14) Half-speed Power Supply Unit Cooling Fan Motor #1 (M15)
Approx. 200ms
Approx. 200ms
PC Drum Charge Comb Cleaning ON Motor (M7), and Image Transfer/ Paper Separator Wire Cleaning Motor (M8) OFF Approx. 20ms
Approx. 200ms ON Scanner Motor (M31)
M7, M8 (Stop cleaning after wires complete 1 round trip.)
Check of clamps, gain, light-level adjustment, original-size detection filter
C
When Upper Fusing Roller Thermistor (TH1) reaches the preset temperature. Note: The temperature setting can be changed by Service Choice function. (180°C/190°C/200°C)
OFF Upper Fusing Roller Heater Lamp (H1) Lower Fusing Roller Heater Lamp (H2): 140°C Cycle ON/OFF to adjust temperature.
M-7
=The following shows the sequence for making a single copy onto A4C paper, feeding from the 1st Drawer, at 100% magnification.= D When START key is turned ON (IR Section). Exposure Lamp (FL1) ON IR Cooling Fan Motor (M33) ON Scanner Motor (M31) ......Moves under shading sheet. ON M31............................... Executes Gain/Shading adjustment.
ON
E
After completion Gain/Shading adjustment Approx. 20ms ON Original Detecting Solenoid (SL7) Approx. 20ms ON M31 Original Size Detection: Moves to leading edge of original. OFF SL7 ON Starts M31 scan. Scanner Reference Position Sensor (PC55) Blocked L : Stops M31. Shading signal: L
H
OFF
FL1
OFF
M33
M-8
F
When START key is turned ON (Printer Section). Developer bias Approx. 50ms ON ON PC-Drum Drive Motor (M2) Suction Fan Motor (M14) Approx. 200ms ON ON ON Main Erase Lamp (LA1) PC Drum Charger Grid output After reading AIDC pattern: Approx. 110ms OFF ON Power Supply Unit Cooling Fan Motor #2, #3 (M16, M18) ON ON ON PH Cooling Fan Motor (M19) Ozone Ventilation Fan Motor (M12) Full speed Toner Suction Fan Motor (M13) Developing-Unit Drive Motor (M1) Grid output
ON
Approx. 750ms ON Paper Take-Up Motor (M21) Approx. 500ms ON ON ON ON Approx. 500ms ON
ON
Fusing Motor (M3) Turnover Motor (M6) Vertical Transport Motor (M22) Transport Motor (M23) 1st Drawer Paper Take-Up Clutch (CL3) When Vertical Transport Sensor #1 (PC36) is unblocked: H Approx. 75ms OFF M21 CL3
After completion of take-up: Approx. 1s
OFF
M-9
G
When VD signal from PWB-B (Memory Board) to PWB-A (Master Board) goes L .
Start laser illumination of drum. Approx. 164ms ON ON Synchronizing Motor (M5) Transfer/Separator Charger Approx. 230ms ON Separator-Finger Solenoid (SL4) OFF SL4 Approx. 135ms Exit/Duplex Switching Solenoid (SL3)
Approx.1225ms
ON
H
When sheet clears Transport Roller Sensor (PC1): H Vertical Transport Motor (M22) OFF Approx.131ms Transport Motor (M23)
OFF
I
When sheet clears Paper Leading Edge Sensor (PC2): H Approx.62.5ms Approx.1550ms OFF OFF Synchronizing Motor (M5) Exit/Duplex Switching Solenoid (SL3)
J
When sheet clears Turnover Feed Entry Sensor (PC11): H Approx.400ms Reduce speed of Turnover Motor (M6) Approx. 300ms Reverse the direction of M6
M-10
5. IMAGE STABILIZING SYSTEM
K When sheet clears Turnover/Exit Sensor (PC14): H Turnover Motor (M6) OFF Approx. 5075ms Fusing Motor (M3) OFF
L
When VD signal to PWB-A (Master Board) changes from L to H
Stop laser illumination. Approx. 110ms OFF Grid output OFF Developing Unit Drive Motor (M1) Approx. 290ms Approx. 920ms OFF OFF OFF OFF OFF Transfer/Separator Charger
Approx. 160ms
Main Erase Lamp (LA1) PC Drum Charger Power Supply Unit Cooling Fan Motors #2, #3 (M16, M18)
PC Drum Drive Motor (M2) OFF Power Supply Unit Cooling Fan Motors #2, #3 (M16, M18) OFF PH Cooling Fan Motor (M19) Suction Fan Motor (M14) Toner Suction Fan Motor (M13) Ozone Ventilation Fan Motor (M12) Approx. 500ms OFF Developer bias Half-speed
M-11
1155SBM0500A
q The following table outlines the controls measures taken to maintain stable imaging.
Item Initial Setup Purpose First correct for AIDC sensor disparity and contamination. Then use V control to set initial values for grid voltage (Vg) and developer bias (Vb). Correct for ID drop caused by change in drum sensitivity. Correct for drop in surface potential (surface fogging) caused by drum deterioration. Correct for ID drop caused by low drum sensitivity when copier is first power switch is turned ON (before copier is fully warmed up). Method Set initial values for grid voltage (Vg) and developer bias (Vb).
Short-Term Correction Long-Term Correction Morning Correction (first run each morning) Correction After Prolonged NonUse
Perform V control after every 100 copies. Correct Vg based on cumulative hours of drum rotation. AIDC sensor contamination, use V control to correct the grid voltage (Vg) and developer bias (Vb).
Correct for ID change caused by When START key is pressed, use V change in drum sensitivity due to non- control to correct Vg and Vb before usage for at least two hours in the making the copy. standby state.
T/C Correction Maintain the developing unit's T/C ratio Use ATDC to control the toner resupat a constant level. ply
q The following is a block diagram of the image stabilizing system.
LD
Grid Voltage Vg PC Drum AIDC Sensor Rotation Counter ATDC Sensor Developer bias (Vb) Toner Replenishing Motor
IN CPU
OUT
Control Panel · Service Mode Vg Adjustment ID Setting Table · User Mode Print Density Forced Toner Resupply
Table V Setting Toner Resupply Timer
Control Panel · Settings
1155M080CA
M-12
1155SBM0501A
5-1. AlDC Sensor
To provide image stabilization control, this copier has AlDC Sensor fitted to the Cleaning Unit of the Imaging Unit. The sensor is used to detect the toner density and background level on the PC Drum.
Operation
1: The LED projects approx. 950-nm infrared light onto the surface of the PC Drum. 2: The phototransistor detects the amount of light reflected back. 3: The phototransistor outputs a voltage corresponding to the intensity of the light reflected back.
PC Drum
LED Power Output GND Supply
AIDC Sensor (UN6)
Image Transfer/Paper Separator Coronas
1149M005AA
Toner Density on PC Drum High Low
Light reflected Small Large
Output Voltage High Low
M-13
1155SBM0502A
5-2. Control Methods of the Image Stabilizing System
AIDC Sensor Control
q Controls are implemented as follows.
6
Grid Voltage Control (Vg)
-1. Adjustment of AIDC Sensor Disparity (coarse adjustment) This adjustment is required when normal correction of AIDC contamination and disparity (installation disparity, circuitry error, drum deterioration, etc.) fails to bring operation to within the appropriate range. To make the adjustment, the drum surface is erased and an AIDC pattern is generated on it. A 4-bit analog switch (charge-resistance switch) is then set so as to bring the voltage determined by the combination of the switch setting and the AIDC sensor output to approximately 1 volt. -2. Adjustment for AIDC Sensor Contamination (fine adjustment) Contamination of the AIDC sensor by toner or other material will cause a drop in the sensor output voltage. This must be corrected for if the AIDC sensor is to continue providing reliable reference values. To make the adjustment, the drum surface is erased and an AIDC pattern is generated on it. LED current is then adjusted to bring the AIDC sensor output voltage to 1V.
CONTROLLED PART AIDC Sensor CONTROL SIGNAL PJ10A-1B WIRING DIAGRAM C-4
-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 4.27V (lighter) to 4.29V (darker). 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 70 hours of drum rotation.
CONTROL Grid voltage CONTROL VALUE -365V to -905V INITIAL VALUE -653V
M-14
1155SBM0600A
6. PC DRUM
q The copier uses an OPC (organic photocondutor) drum.
* The drum consists of an aluminum base coated with a carrier generation layer and a charge holding layer. q The drum provides good spectral sensitivity in the near infrared range. (Usage Precautions) Protracted exposure to extraneous light can cause the drum surface to suffer light fatigue, resulting in a loss of optical sensitivity. If the drum is removed from the unit, it should be wrapped in a soft clean cloth or other protective covering to prevent lengthy exposure to ambient light. (Drum Cross-Section) PC Drum Charge Holding Layer Carrier Generation Layer
Aluminum Base
1139M006AA 1139M007AA
1155SBM0601A
6-1. Drum Drive Mechanism
q The drum is driven by the PC Drum Drive Motor. A flywheel mounted to the drum
shaft helps to maintain smooth rotation. Flywheel PC-Drum Drive Motor (M2)
1155M035AA
CONTROLLED PART CONTROL SIGNAL M2 PJ7A-2A
ON L
OFF H
WIRING DIAGRAM E-4
M-15
1155SBM0602A
6-2. Grounding of the PC Drum
The PC Drum ground point is inside the rear end. When the PC Unit is slid into the copier, the Drum Holding Shaft contacts the ground point. This provides for assured grounding of the PC Drum through the Ground Plate in the rear to the frame of the copier.
Ground Plate
Drum Holding Shaft
Ground Point
Drive Gear
1155M034AA
M-16
1155SBM0700A
7. DRUM CHARGING
A scorotron charger system generates a negative DC corona discharge onto the drum surface. A grid mesh provides uniform charging. The grid voltage (VG) applied to the grid mesh is controlled by the constant voltage circuitry within the Drum Charge High Voltage Unit (HV1). In order to restrict ozone production, the copier utilizes two comb electrode chargers to generate the charge. Whereas wire type chargers produce circular coronas that can generate significant ozone on all sides, the comb electrode charger concentrates the discharge onto the grid mesh, thereby reducing ozone generation. Holder Comb Electrode Spring Holder
Grid Mesh
PC Drum Drive Motor (M2) PC Drum Charger Developing Unit Drive Motor (M1) ON OFF ON OFF ON OFF 200msec. 920msec.
950msec.
1155T21MCB
CONTROL SIGNAL
ON L
OFF H
WIRING DIAGRAM F~G-8~9
HV1 PC Drum Charger
PJ9A-2A
INITIAL VALUE CONTROL SIGNAL -614V
WIRING DIAGRAM F-8
Grid Voltage (VG) NOTE
PJ9A-12A
Will vary in accordance with image stabilizing control.
M-17
1155SBM0701A
7-1. PC Drum Charge Corona Comb Electrode Cleaning Mechanism
The two PC Drum Charge Corona Comb Electrodes are provided with a cleaning mechanism that removes from the electrodes any toner and dust particles which would otherwise cause uneven charging, white streaks on copies, and charge leak. q When PC Drum Charge Comb Cleaning Motor M7 is energized, its drive is transmitted to the Screw Shaft. This in turn moves the Cleaner mounted on the Screw Shaft. q Drum Comb Cleaner Home Position Sensor PC16 detects the Cleaner at its home position (which is the reference position for its cleaning motion). The Cleaner makes one round trip per each cleaning cycle to clean the electrodes. PC16 Cleaner
Comb Electrodes Actuator
M7 Screw Shaft
1161M004AA
M-18
q The PC Drum Charge corona wires are automatically cleaned under the following conditions. The cleaning function is, however, disabled if the "Charge Wire Cleaning" function of "System Input" available from the Tech. Rep. mode has been set to "Off". (1) A period of 500 msec. has elapsed after Power Switch S1 has been turned ON. (2) The number of copies made exceeds 10K after S1 has been turned ON and 10 minutes elapse after the last copy cycle has been completed. (3) A PC Drum Charge Corona malfunction, which has been detected, is reset. (4) A misfeed/malfunction, which has been detected, is reset with a sheet of paper remaining at the area near the Image Transfer/Paper Separator Corona.
1155T22MCA
CONTROL SIGNAL M7 PJ10A-6A CONTROL SIGNAL PC16 PJ9A-14A
FORWARD
BACKWARD
WIRING DIAGRAM B-4 WIRING DIAGRAM G-4
Pulse Output UNBLOCKED H BLOCKED L
M-19
1155SBM0702A
7-2. Ozone Filter
q Ozone produced by the PC Drum Charge Corona is absorbed by the Ozone Filter
as the air is drawn out of the copier by Ozone Ventilation Fan Motor.
PC Drum Charger Ozone Filter
PC Drum Cooling Fan Motor (M17) Ozone Ventilation Fan Motor (M12)
1155M005AA
CONTROL SIGNAL M12 M17 PJ10A-7B PJ10A-6B
ON L L
OFF H H
WIRING DIAGRAM B-10 A-10
M-20
8. IR SECTION 8
· Light reflected from the original during scanner movement passes through three mir-
rors and one lens to form a reduced image on the CCD sensor. The sensor converts the light pattern (image data) into an electrical image signal. · The electrical image signal is then converted into a digital image signal. The digital image signal passes through correction processing, and the result is output to the MSC board.
2
3
4 1
5
7 8
6
10
9
1155M006AA
1. 2. 3. 4. 5.
Scanner Motor (M31) Scanner Drive Cable Scanner Reference Position Sensor (PC55) Exposure Lamp Inverter Board (UN10) Digital Image Processing Board (PWB-IB)
6.
CCD Analog Image Processing Board (PWB-IA) 7. Lens 8. Exposure Lamp (FL1) 9. Scanner 10. 2nd/3rd Mirror Carrige
M-20
1155SBM0801A
8-1. Exposure Section: Structure and Operation
1
2 3 4
1155M007AA
1. Auxiliary Reflector When books or other bound volumes are copied, the paper in the area near the binding generally fails to come flush against the glass, so that the copy for these areas is generally too dark. The Auxiliary Reflector reduces the problem by reflecting light from the Exposure Lamp onto the original. 2. Exposure Lamp Heater This heater warms up the exposure lamp, reducing the system's warmup time. 3. Exposure Lamp Fluorescent lamp used to illuminate the original. 4. Mirror #1 Directs the reflected light from the original over to Mirror #2.
M-21
1155SBM0802A
8-2. Exposure Lamp ON/OFF Control
· ON/OFF of the Exposure Lamp is controlled by the Exposure Lamp remote signal
from the Digital Image Processing Board.
· ON/OFF timing varies according to whether the operation is generated by the Power
Switch or by the Start key, as follows. =Operation when Power Switch is switched ON= The timing operates in conjunction with automatic adjustment of clamp level and gain, as described below. · Automatic adjustment of clamp level: Sets the black level when scanning an image. · Automatic adjustment of gain: Sets the maximum white level. These adjustments correct for fluctuations in output voltage caused by environmental changes and by performance disparities among components.
· Power Switch turns ON, the Exposure Lamp remote signal goes L , causing the
Exposure Lamp to come ON.
· The Exposure Lamp intensity remains at 100% adjustment during that the Expo-
sure Lamp is ON, and is then readjusted.
· The Exposure Lamp remote signal goes H (Exposure Lamp goes OFF) the
completion of the original detection filter check.
CONTROL SIGNAL Exposure Lamp Remote Signal PJ9IB-12A ON
L
OFF
H
WIRING DIAGRAM C-18
Exposure Lamp (FL1) Exposure Lamp Remote Signal Original Detecting Solenoid (SL7)
ON OFF H L ON OFF
Clamp Adjustment 100% ON Temp. Adjustment Gain Adjustment Original-Detection Filter Check
1155T36MCC
Gain Adjustment
M-22
=Operation when START key is pressed (ON)=
· The Exposure Lamp remote signal goes L
(Exposure Lamp comes ON) as soon as the Start key is pressed. To help ensure stable illumination, data scanning (including sequential-data scanning) does not begin until the lamp has been ON. · The lamp remains on continously during EDH-1 copy operation. (This measure is taken to help prolong the lamp's life.)
· Manual placement mode scan, the Exposure Lamp remote signal goes H (caus-
ing the Exposure Lamp to go OFF) when the subscan-area signal from the Digital Image Processing Board changes from L to H .
· Under EDH-1 single-feed mode, the Exposure Lamp goes off the Subscan-Area
signal changes from L to H .
· Under book mode, the Exposure Lamp goes off the Subscan-Area signal
changes from L to H .
CONTROL SIGNAL Subscan Area Signal (VD) PJ3B-27 ON
L
OFF
H
WIRING DIAGRAM H-18
-Manual placement of originalStart Key ON
Exposure Lamp (FL1) Exposure Lamp Remote Signal Subscan Area Signal (VD)
ON OFF H L H L
Shading Read
FL1 ON
Original Detect Original Read
1155T37MCC
-EDH-1 (Single Feed Mode)Start Key ON
Exposure Lamp (FL1) Exposure Lamp Remote Signal Subscan Area Signal (VD)
ON OFF H L H L
Shading Read
FL1 ON
Original Read
1155T38MCC
M-23
1155SBM0803A
8-3. IR Image Processing System
· 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-IA 3. ODD/EVEN Synthesis: PWB-IB 4. Shading Correction: PWB-IB
5. Histogram Processing: PWB-IB
6. Image Monitor: PWB-IB
7. Magnification Processing: PWB-IB 8. MTF Correction: PWB-IB 9. IR Density Correction: PWB-IB 10. Octal-to-Binary Converter: PWB-IB 11. S/P Conversion: PWB-IB Memory: PWB-B PH: PWB-J/L
M-24
1. Photoelectric Conversion (CCD Sensor): PWB-IA
· Light from the Exposure Lamp (FL1) 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-IA
· 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-IB
· This block Synthesizes the ODD and EVEN signals received from the preced-
ing block into a single image-data signal.
4. Shading Correction: PWB-IB
· Corrects shading error introduced by factors such as sensitivity differentials
among CCD sensor pixels, uneven FL1 light distribution, and uneven lens shading. Following this correction, the resulting data is converted by the Reflectivity/Density Converter into image density data that is in linear proportional to the density of the original image.
5. Histogram Processing: PWB-IB 6. Image Monitor: PWB-IB
· Generates a histogram of the image data, for use during EE/gain adjustment. · Monitors the image data. Used for detecting the size of the original. · Adjusts the image in accordance with the feature setting (Enlarge/Reduce)
7. Magnification Processing: PWB-IB
made at the control panel.
8. MTF Correction: PWB-IB
· Reduces the image noise contained in the image density data, smooths the
image, adds emphasis to borders of characters and lines, and adds sharpness.
9. IR Density Correction: PWB-IB
· Corrects the gradation of the image density data, in accordance with the imag-
ing mode and copy density set at the control panel, so as to produce optimal density and image quality.
10. Octal-to-Binary Converter: PWB-IB
· Converts image density data from 8-bit data to 1-bit data, using an error-dis-
persing binarization method.
11. S/P Conversion: PWB-IB
· Converts the binarized image-density data into an 8-bit parallel signal, and
transmits this signal to the memory section.
M-25
1155SBM0804A
8-4. Image Density Control
1) Auto Density (AE) Control ·Auto Density Control (AE 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. · Unlike correction by analog PPC, the AE control method holds the intensity of the exposure lamp constant and determines the characteristics of the original by means of sample data obtained through realtime scanning. The IR Density Correction Processing section then removes the background components that are below the threshold.
Original Original placement
CCD Sensor PWB-IA Lens PWB-IB PWB-B Memory IR Density correction Shading correction
PWB-J
CPU
Histogram processing
PWB-L Laser Diode
PH Section
Copy
1155M101CA
· The user can select from three levels (Light, Normal, or Dark) by User Choice setting. · Automatic density control (AE control) is effective only if the copier is operating in Character mode. If the copier is in Photo mode, then only manual density control is available.
M-26
· Realtime scanning is carried out by scanning the image data while copying is in progress. (This is the same type of scanning used with analog PPCs). · The data samples are plotted into a reflectivity histogram. The histogram is used to determine the type of the original, and the background removal threshold is calculated accordingly. · The CPU of the Auto Density (AE) Control Section generates the histogram (image data reflectivity distribution) from the data samples obtained by realtime scanning. · The reflectivity distribution varies according to the type of original being copied. The CPU recognizes five different original types, based on the position of the peak (*1) within the histogram, and calculates the background removal threshold accordingly. The five recognized types are: two-tone B&W; newspaper; magazine; map; and photograph.
Frequency Peak Value Position of peak varies according to type of original.
(Black)
100 Reflectivity Histogram
200
Reflectivity Data 255 (White)
1155M102CA
*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. · Photographs, unlike the other original types, generally do not have a clearly defined peak, since the reflectivity distribution tends to vary irregularly across the entire length of the histrogram. The CPU is therefore unable to calculate a reliable background removal threshold. To prevent damage to the image caused by inappropriate background removal, therefore, the copier sets the threshold to the manual density mode's center setting (setting "5"). [Note: Copying in PHOTO mode may be advised for documents that contain many photographic images.]
M-27
· The control flow for auto density (AE) control is shown below.
Start Key ON The scanner starts normal scanning of the document. (The copy cycle starts.) 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
X=a-b X: Image density value after density correction a: 1 : Image density value before density correction -b: Threshold (intercept)
0
Input
-b
1155M103CA
To on next page.
M-28
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 highdensity areas. The above processing helps retain density detail within characters and other high-density areas, while removing the fogging component from the low-density areas.
· The following block diagram illustrates the operation of auto-density (AE)
control.
Sampling
CCD (ODD/EVEN)
Analog Processing block (PWB-IA)
PWB-IB White Level Correction Reflectivity/Density Converter Histogram Processing block
CPU IR Density Correction block
Memory
1155M104CB
M-29
2) Manual Density Control · If the copier is set to manual density mode, the user can set copy density to any of nine settings (or "steps") at the control panel (touch panel). · Based on the user's setting, the CPU of the PWB-IB transmits a predetermined background removal threshold value to the IR Density Correction block, which then implements density correction accordingly.
Original Original placement
CCD Sensor PWB-IA Lens PWB-IB PWB-J PWB-B Memory IR density correction
PWB-L
CPU
PWB-B
PH Section
AUTO Control Panel
Copy
1155M105CA
· The control flow during manual density mode is described below.
The user selects manual density mode at the touch panel, and then sets the density level ("step"). The step setting is transmitted through the Memory board to the Digital Image Processing Board.
The CPU on the Digital Image Processing board finds the background removal threshold value that corresponds to the step setting. To on next page.
M-30
The threshold value is transmitted from the PWB-IB 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
X=a-b X: Image density value after density correction a: 1 : Image density value before density correction -b: Threshold (intercept)
0
Input
-b
1155M103CA
For all quality modes other than "Photo," the gradation curve of the densitycorrected 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
Input
1155M106CA
The above processing enables the user to select copy density effectively for any of the image quality modes. · The following block diagram illustrates the manual density control flow.
Manual Density Mode Photoelectric Conversion (PWB-IA) CCD (ODD/EVEN)
PWB-B
PWB-IB CPU IR Density Correction
Memory
1155M107CB
M-31
1155SBM0805A
8-5. Detection of Original
1) Detection · The detection system detects the original's size, position, and skew. · Detection operation is illustrated below.
1
2
1155M059AA
: Detection of Original : Scanning of Original
1155M059AA
: Detection of Original ,: Return : Scanning of Original
1155M099AA
q Detection is achieved using the EDH-1 pressure pad, the Original Detecting Fil-
ter, and the CCD Sensor. The copier implements detection independently in the scan and subscan directions. q Because the EDH-1 pressure pad is yellow, the system can distinguish between the light reflected from the pad and the light reflected from the original. q The original detecting filter is a low-pass filter (LPF) that passes visible light in the approximate region of 400nm to 460nm. The filter blocks almost all light in the 530nm to 700nm range. This reflectivity difference makes it possible for the CCD sensor to detect only the light that is coming from original.
PWB-IA Original Detecting Filter (LPF) CCD Sensor
1155M113CA
Lens
:Light reflected from original :Light reflected from EDH-1 pressure pad :Light reflected from original, after passing through filter (400nm to 460nm)
M-32
The system can detect originals that meet the following conditions. q Edge coloration (wavelength) is between 400nm and 490nm, provided that average reflectivity of this color is at least 39%. q Shape is rectangular. Note that the system cannot detect the following types of original: · OHP transparencies, translucent paper · Sheets with edges not flush against the Original Glass · Sheets whose shape is not rectangular · Sheets with an image of OD = 0.5 or more in areas along the 1-mm-wide edge · Sheets that are bright red, orange, or yellow -Metric AreaMain Scan Direction Actual Size of Original 374.1mm and above 374.0 to 340.1mm 288.3mm and above A3L A3L A3L A3L A3L A3L A4C A4C 288.2 to 267.1mm A3L A3L A3L A3L A3L A3L Letter-C Letter-C 267.0 to 220.1mm A3L B4L B4L B4L B4L B4L A4C A4C 220.0 to 158.1mm A3L B4L FLS A4L Letter-L A4L A4L A5C 158.0mm or less A3L B4L FLS A4L Letter-L A4L A5L A5L
-Inch AreaMain Scan Direction Actual Size of Original 391.1mm and above 391.0 to 365.7mm 365.6 to 307.1mm 307.0 to 288.3mm 288.2 to 226.0mm 225.9 to 149.8mm 149.7mm or less 288.3mm and above 11 x 17 11 x 17 11 x 17 11 x 17 11 x 17 A4C A4C 288.2 to 226.0mm 11 x 17 11 x 15 11 x 15 11 x 15 11 x 15 Letter-C Letter-C 225.9 to 149.8mm 11 x 17 11 x 15 8.4 x 14 A4L Letter-L Letter-L invoiceL 149.7mm or less 11 x 17 11 x 15 8.4 x 14 A4L Letter-L invoiceL invoiceL
Subscan Direction Subscan Direction
340.0 to 307.1mm 307.0 to 288.3mm 288.2 to 267.1mm 267.0 to 220.1mm 220.0 to 158.1mm 158.0mm or less
L: Lengthwise
C: Crosswise
L: Lengthwise
C: Crosswise
M-33
2) Detection System · The following diagram shows the spectral reflectivity of the (yellow) EDH-1 pressure pad and the spectral transmissitivity of the original detecting filter.
Spectral Reflectivity/ Transmissivity (%)
100
Transmitting Area
Cutoff Area
80
Filter Transmissivity
Yellow Reflectivity
60
40
20
Threshold Average Yellow Reflectivity
0 400 500 600 700 (nm)
1155M108CA
Wavelength (Visible Range)
· The reflectivity of the yellow pressure pad, indicated by the bold line (
), averages above 80% in the wavelength range 530nm to 700nm, but below 26% in the range 400nm and 490nm.
· The filter's transmissitivity, indicated by the thin line (
), averages above 87% in the wavelength range 400nm to 460nm, but below 5% in the range 530nm and 700nm. · When detection is operating, therefore, the yellow reflected light from the pad is cut off by the filter before it reaches the CCD sensor. The CCD sensor therefore receives light only from the original. ·Note, however, that the yellow pad does in fact reflect some light (an average of below 26%) within the 400nm to 490nm range. A threshold is therefore introduced with respect to reflectivity within this wavelength range, to prevent the system from interpreting this light as coming from the original. · The CPU sets this threshold value based on the maximum reflectivity of the yellow light from the pad.
M-34
· The reflected light that passes through the filter reaches the CCD Sensor, which
converts the light into an electrical signal (image data signal). This signal then passes into the Digital Image Processing Board, as illustrated below.
EDH-1 Original
Original Glass
Lens PWB-IA Original Detecting Filter (LPF) Digital Image Processing Boad (PWB-IB) Shading Correction PWB-IC Image Monitor CPU Motor Driver Scanner Motor
M31
CCD Sensor
1155M109CC
:Light reflected from original :Light reflected from EDH-1 pressure pad :Reflected light, after passing through filter
· The Image Monitor circuitry (within the Digital Image Processing board) extracts
the image data that is coming from the edges of the original.
· The extracted edge data is used to calculate the original's size, its position, and
its skew. The results of these calculations are then used to determine the reading area for the CCD sensor and scanning start point for the scanner.
M-35
L A
M
B
Original
1155M111CA
· The skew is calculated from the main-scan and subscan edge values, as follows.
(1) Skew = (B-A) / (M-L) = tan
· Relation (1) gives the angle of tilt. · If the user has set the skew warning mode to ON ("user's choice" setting),
then the copier will output a warning if the detected skew is beyond the acceptable limit.
M-36
3) Original Detecting Filter Mechanism · Switching of the Original Detecting Solenoid causes the Original Detecting Filter to flip up and down, as shown below.
Original Detecting Filter
Original Detecting Solenoid (SL7)
Cushion (*1)
1155M031AA
*1: The cushion muffles the sound of the filter dropping down (when the Original Detecting Solenoid switches OFF). Detection operation in progress Original Detecting Mechanism Lens CCD Sensor
1155M032AA
While copying is in progress, or while the copier is in standby Lens Original Detecting Mechanism CCD Sensor
1155M033AA
M-37
4) ON/OFF Control of Original Detecting Solenoid · The Original Detecting Solenoid is controlled by the Original Detecting Solenoid remote signal output by the Digital Image Processing Board. At Power Switch ON, or at CPU Reset · When the copier is executing clamp/gain auto-adjustment, the Original Detecting Solenoid remote signal goes L after the exposure lamp comes on for the second time, causing the Original Detecting Solenoid to go ON. (This is done to check the operation of the Original Detecting Filter.) At Start Key ON · If the copier is set to a mode that uses original detection: The Original Detecting Solenoid remote signal goes L when the shading sequence is completed, causing the Original Detecting Solenoid to come ON. (The Original Detecting Solenoid remote signal and the Original Detecting Solenoid solenoid do not operate if the copier is set to a mode that does not use original detection.) At Power Switch ON, or at CPU Reset · When the copier is executing clamp/gain auto-adjustment, the Original Detecting Solenoid remote signal goes H after the Original Detecting Solenoid comes ON. This causes the Original Detecting Solenoid to go OFF. At Start Key ON
· The Original Detecting Solenoid remote signal goes H when the original
detection sequence is completed, causing the Original Detecting Solenoid to go OFF.
Power Switch(S1) : ON SL7 Remote Signal Start Key ON Detection completed
L
L
Original Detecting Solenoid (SL7) Scanner Reference Position Sensor (PC55) Exposure Lamp (FL1)
ON
ON
L
L
L
ON Clamp/Gain auto-adjustment
ON Original Detecting Filter operating check
ON Shading sequence Original-detection sequence Copying
1155T39MCB
CONTROL SIGNAL SL7 PJ9IB-3B
ON
L
OFF
H
WIRING DIAGRAM A~B-15~16
M-38
1155SBM0806A
8-6. Drive Mechanism for Scanner and Mirrors Carriage
· As the scanner moves, light from the exposure lamp projects evenly along the
original, reflects off the original, bounces off Mirror #1, and moves to Mirrors #2 and #3. · The scanner is driven by the Scanner Motor by means of a single Scanner Drive Cable. The scanner speed for 100% magnification is taken as the "reference speed"; the actual speed is varied (with respect to the reference speed) in accordance with the magnification setting. · The scanner's home position is at the Scanner Reference Position Sensor. This position serves as the reference for the scan motion. · Mirror #2 and Mirror #3 are fixed to the carriage at a right angle to one another. Light reflected from Mirror #1 bounces off Mirrors #2 and #3, passes through the lens, and moves to Mirror #4. · The carriage for Mirrors #2 and #3 is driven by the Scanner Motor by means of the Scanner Drive Cable and a pulley. The carriage moves at half the speed of the scanner, maintaining a constant optical path length between the Original Glass and the PC Drum. Scanner Drive Cable Scanner Motor (M31)
Scanner Reference Position Sensor (PC55)
Scanner Mirror Carriage for Mirrors #2 and #3
1155M074AA
M-39
1155SBM0807A
8-7. Scanner Motor Drive Control
· The Scanner Motor is a DC server motor. The motor is controlled by PWM (pulse width modulation); that is, the speed controlled by varying the average width of the motor drive pulse. · The motor incorporates a built-in photosensor and pulse disk that generate a "monitor" pulse with each rotation of the shaft. This signal is transmitted to the Image Processing Board, which uses it to detect the motor's speed and travel distance. · The Processing board determines the current motor speed based on the rate of the incoming monitor pulse, and adjusts the scanner drive pulse as necessary to maintain stable motor speed. · At the same time, the SCP uses the monitor-pulse count to control the scanner's travel distance, where the pulse count required for a full motion varies according to the paper size and the magnification.
Control Signal M31 (Scan Signal) PJ9IB-10B
Scan
L
Stop
H
WIRING DIAGRAM D-17
Control Signal PC55 PJ9IB-2A
UNBLOCKED
H
BLOCKED
L
WIRING DIAGRAM D-18
M-40
1155SBM0808A
8-8. Scanner Movement
· At Start Key ON EDH-1 Original : Start transport of original sheet. IR Section : Turn the Exposure Lamp on, complete warmup, and then start scanner movement. Main Unit : Start transport of copy paper. Registration Roller Scanner reference position Scanner EDH original scan position
1155M062AA
Gain/shading adjustment position
EDH-1
: Stop the original sheet at the transport roller. IR Section: Adjust gain; sample the shading data. Main Unit : Continue transport of copy paper.
1155M063AA
EDH-1 : Start transport of original. IR Section: Move scanner to EDH-1 original scan position. Main Unit : Continue transport of copy paper.
1155M064AA
EDH-1 : Transport the original sheet (eject). IR Section: Scan (read) the image, and store the image data into memory. Main Unit : Prepare memory output, then begin printing. EDH-1 : Complete original transport, and then stop. IR Section: Complete the image read, then move to scanner reference position, and then stop. Main Unit : Complete printing, and then stop.
1155M065AA
1155M066AA
M-41
· At Start Key ON IR Section: Set the Exposure Lamp on, complete warm-up, and then start scanner movement. Main Unit: If APS : Standby If not APS : Start transport of copy paper. Home position for hand-placed original Original Scanner reference position Scanner Gain/shading adjustment position
1155M067AA
IR Section: Adjust gain; Scanner returns to its home position after shading data sampling correction. Main Unit: If APS : Standby If not APS : Feed copy paper. IR Section : Run prescan to detect original's size. Main Unit: If APS : Standby If not APS: Stop copy paper at timing-roller area (standby) IR Section: · Scan (read) the image, and store the image data into memory. · Move to scanner reference position, then stop. Main Unit: If APS : · Select copy paper based on original's size. Begin copy paper feed. Stop copy paper at synchronizing roller area. · Prepare memory output, then begin printing. · Stop when printing is completed. If not APS : · Prepare memory output, then begin printing. · Stop when printing is completed.
1155M068AB
Prescan
1155M069AA
Prescan
1155M100AA
Actual Scan
1155M070AA
M-42
1155SBM0809A
8-9. CCD and IR Cooling Fan Motors
· Fans are installed to prevent the IR section from overheating as a result of the heat
generated by the Exposure Lamp and other components. The CCD Cooling Fan Motor draws in air from the outside. The IR Cooling Fan Motor passes heated air to the Ozone Ventilation Fan Motor, which then passes it out of the unit. CCD Cooling Fan Motor (M32)
IR Cooling Fan Motor (M33)
Ozone Ventilation Fan Motor (M12)
Control Signal M32 M33 PJ10A-9B PJ9IB-1B ON
L L
1155M075AA
OFF
H H
WIRING DIAGRAM A~B-10 B-15~16
M-43
1155SBM0900A
9. MEMORY SECTION
Memory Board (PWB-B)
Memory Section
1155M045AA
· The Memory Board contains built-in memory. This memory enables rapid storage
and handling of the large quantities of image data generated from the originals.
· The memory receives the image data from the IR section. The memory allows for
efficient coordination between the IR section and the printer section, thereby improving the copying performance. · Standard memory capacity is 16MB. The capacity can be increased by installing expansion memory or a hard disk.
M-44
· Memory Storage Image Processing System
· The memory section receives binarized image data from the IR section's Digital
Image Processing Board, processes the data as described below, and outputs the result to the PH section. IR Section Input Image Memory (2MB) Compression Circuitry Encoded Memory (16MB) Expansion Circuitry Output Image Memory(12MB) PH Section Input Image Memory · Stores binarized image data, which then moves into the next block for further compression. · Consists of DRAM, and is capable of storing about one A4 page of copy data. Compression Circuitry · Inputs the binarized 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. Memory Section
M-45
Encoded Memory · Stores the encoded (compressed) data received from the previous block. · Consists of 16MB of DRAM. Capable of holding data for up to about 200 pages of standard A4 originals. Expansion Circuitry · This block expands the data from the Encoded Memory block (restores the data to the form it had prior to compression by the Compression Circuitry block). Output Image Memory · Stores the expanded image data and performs the image rotation, shift, erase, and other editing functions for subsequent output to the printer.
M-46
1155SBM1000A
10. PH SECTION
q Image data from the memory section is corrected in accordance with the PH copy
characteristics. The laser diode (LD) then generates the latent image defined by the corrected data onto the PC drum. q This copier is provided with two types of Laser Units, one for 400 dpi and the other for 600 dpi. The 400-dpi Laser Unit emits laser light when the machine is used as a copier, while the 600-dpi Laser Unit emits light when the machine is used as a printer hooked up to a personal computer.
2
3
1
4
1155M046AA
1. 2.
PH Board (PWB-J) PH Unit
3. 4.
CCD Cooling Fan Motor (M32) Polygon Motor Control Board (UN5)
M-47
q PH (Printer Head) Components
5
6
4 3 2 1 7
10 9 8
1155M008AA
1. 2. 3. 4. 5.
Polygon Motor (M4) Cylindrical Lens 600dpi LD/Collimeter Unit Beam Splitter 400dpi LD/Collimeter Unit
6. 7. 8. 9. 10.
SOS Sensor Board (PWB-G) Return Mirror Long Cylinder Lens SOS Mirror f- Lenses
M-48
1155SBM1001A
10-1. PH Image Processing System
q 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. PH-I/F: PWB-J 2. Bit Expansion: PWB-J 3. Screen Processing: PWB-J 4. Correction: PWB-J 5. PH Line Memory: PWB-J 6. Erasure of Outside Area: PWB-J 7. D/A Conversion: PWB-L 8. LIMOS Circuitry: PWB-L 9. Laser Emission: PWB-L
M-49
1. PH-I/F: PWB-J Blocks out external noise during transfer of image density data from the memory section (PWB-B) to the PH section. 2. Bit Expansion: PWB-J 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 "character mode", the block outputs binary image density data values without change.) 3. Straight-Line Screen Processing: PWB-J This section operates only if image quality is set to "photo." The section enhances visible copy quality by improving the grain of the copy's middle tones, stabilizing the density reproduction of low-density areas, and reducing pitch disparities in the subscan direction. These improvements are obtained by combin