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CF910
SERVICE MANUAL
1154-7990-11
CONTENTS
GENERAL
1. SAFETY INFORMATION ................................................................................... G-1 2. SPECIFICATIONS .............................................................................................G-6 3. PRECAUTIONS FOR INSTALLATION .............................................................. G-9 4. PRECAUTIONS FOR USE ................................................................................ G-10 5. HANDLING OF THE CONSUMABLES .............................................................. G-11 6. OTHER PRECAUTIONS .................................................................................... G-11 7. SYSTEM OPTIONS ........................................................................................... G-12 8. HIGHLIGHTS ..................................................................................................... G-13
MECHANICAL/ELECTRICAL
1. CROSS-SECTIONAL VIEW AND PAPER PATH .............................................. M-1 2. COPY PROCESS .............................................................................................. M-2 3. DRIVE SYSTEM ................................................................................................ M-5 4. OPERATING SEQUENCE ................................................................................. M-6 5. CONTROL BLOCK DIAGRAM ........................................................................... M-11 6. IMAGE STABILIZATION SYSTEM .................................................................... M-12 6-1. Image Stabilization System Overview ...................................................... M-12 6-2. Image Stabilization System Control .......................................................... M-13 7. PC DRUM SECTION ......................................................................................... M-16 7-1. Grounding of the PC Drum ....................................................................... M-16 7-2. PC Drum Drive Mechanism ......................................................................M-17 7-3. PC Drum Temperature Control ................................................................. M-18 8. PC DRUM CHARGING SECTION ..................................................................... M-19 8-1. PC Drum Charge Corona ON/OFF Control .............................................. M-19 8-2. PC Drum Charge Corona Wire Cleaning Mechanism .............................. M-20 8-3. PC Drum Charge Section Ozone Filter .................................................... M-21 9. IMAGE READER (IR) SECTION ........................................................................ M-22 9-1. IR Image Processing ................................................................................ M-23 9-2. CCD Sensor .............................................................................................M-32 9-3. Exposure Components Section ................................................................ M-33 9-4. Exposure Lamp Control ............................................................................ M-34 9-5. Scanner and 2nd/3rd Mirrors Carriage Movement Mechanism ................ M-35 9-6. Scanner Motor Drive Control .................................................................... M-36 9-7. IR Section Cooling Fan Motor Mechanism ............................................... M-38 9-8. Original Size Detecting Section ................................................................ M-39 10. PRINTERHEAD (PH) SECTION ......................................................................M-42 10-1. Image Processing Block Diagram .......................................................... M-43 10-2. Laser Exposure Process ........................................................................ M-45 10-3. Laser Emission Timing (SOS Signal) ..................................................... M-46 10-4. Laser Emission Area (HIA and VIA Signals) .......................................... M-47 10-5. LIMOS I and New Screen LIMOS ........................................................... M-48 11. DEVELOPING UNIT SECTION ....................................................................... M-49 11-1. Developing Unit Drive Mechanism ......................................................... M-51 11-2. Developer Flow ....................................................................................... M-53 11-3. Developing Bias and ATDC Bias ............................................................ M-55
i
11-4. ATDC Sensor ......................................................................................... M-56 11-5. AIDC Sensor ........................................................................................... M-58 11-6. Black Toner Replenishing Control .......................................................... M-59 11-7. Auxiliary Toner Replenishing Mechanism .............................................. M-61 11-8. Toner Suction Fan Motor ........................................................................ M-62 12. TONER HOPPER SECTION ........................................................................... M-63 12-1. Toner Replenishing Mechanism ............................................................. M-64 12-2. Toner Empty Detection Control .............................................................. M-66 13. PAPER TAKE-UP/FEED SECTION ................................................................. M-67 13-1. Universal Tray Paper Size Detection Mechanism .................................. M-68 13-2. Drawer-in-Position Detection Mechanism .............................................. M-70 13-3. Drawer Paper Lifting/Lowering Mechanism ............................................ M-71 13-4. Paper Empty Detection Mechanism ....................................................... M-73 13-5. Paper Take-Up Mechanism .................................................................... M-74 (1) Paper Separating Mechanism ........................................................... M-75 (2) Feed/Separator Roll Release Mechanism ......................................... M-75 (3) Paper Take-Up Roll Retracting Mechanism ...................................... M-76 13-6. Paper Dehumidifying Heaters and Humidity Sensor .............................. M-77 13-7. Vertical Transport Drive Mechanism ...................................................... M-78 13-8. Paper Take-Up Control ........................................................................... M-79 14. MANUAL FEED TABLE SECTION .................................................................. M-81 14-1. Manual Feed Paper Take-Up Mechanism .............................................. M-81 14-2. Manual Feed Take-Up Control ............................................................... M-82 14-3. Manual Take-Up Roll Pressure Mechanism ........................................... M-83 14-4. Manual Feed Paper Separating Mechanism .......................................... M-84 14-5. Manual Feed Paper Empty Detection Mechanism ................................. M-85 14-6. Manual Feed Paper Width Detection Mechanism .................................. M-86 14-7. Manual Feed Paper Length Detection Mechanism ................................ M-87 15. SYNCHRONIZING ROLLERS SECTION ........................................................ M-88 15-1. Synchronizing Roller Drive Mechanism .................................................. M-88 15-2. Synchronizing Roller Drive Control ......................................................... M-89 16. TRANSFER DRUM SECTION ......................................................................... M-90 16-1. Transfer Drum Drive Mechanism ............................................................ M-91 16-2. Paper Attraction ...................................................................................... M-92 (1) Static Charge Roller .......................................................................... M-93 (2) Backup Blade 2 ................................................................................. M-94 (3) Static Charge Corona ........................................................................ M-94 (4) Charge Neutralizing Cloth ................................................................. M-94 (5) Paper Attraction Detection (before image transfer) ........................... M-95 (6) Control ............................................................................................... M-95 16-3. Image Transfer Section .......................................................................... M-96 (1) Backup Blade 1 ................................................................................. M-97 (2) Image Transfer Corona ..................................................................... M-98 (3) Charge Neutralizing Cloth ................................................................. M-98 (4) Paper Attraction Detection (after image transfer) .............................. M-98 (5) Image Transfer Control ..................................................................... M-99 16-4. Paper Separation Section ....................................................................... M-100
ii
(1) Paper Separation Lifting Finger ......................................................... M-101 (2) Paper Separator Corona ................................................................... M-101 (3) Paper Separator Finger ..................................................................... M-101 (4) Paper Separating Failure Detection Mechanism ............................... M-102 (5) Paper Holding Mechanism ................................................................ M-102 (6) Paper Separation Control .................................................................. M-103 16-5. Transfer Film Cleaning Mechanism ........................................................ M-104 16-6. Oil Cleaning ............................................................................................ M-105 (1) Oil Cleaning Backup Brush ............................................................... M-106 (2) Oil Roller ............................................................................................ M-106 (3) Oil Cleaning Control .......................................................................... M-107 16-7. Toner Cleaning ....................................................................................... M-108 (1) Toner Cleaning Backup Brush .......................................................... M-109 (2) Fur Brush Unit ................................................................................... M-109 (3) Fur Brush Roller/Toner Collecting Roller ........................................... M-110 (4) Fur Brush Control .............................................................................. M-111 16-8. Charge Neutralizing ................................................................................ M-112 16-9. Transfer Drum Retraction Mechanism .................................................... M-113 17. PC DRUM CLEANING SECTION .................................................................... M-114 17-1. Pre-Cleaning Charge Corona ................................................................. M-114 17-2. PC Drum Cleaning .................................................................................. M-115 17-3. Ozone Exhaust from Pre-Cleaning Charge Corona and Transfer Drum M-116 18. MAIN ERASE SECTION .................................................................................. M-117 19. FUSING UNIT SECTION ................................................................................. M-118 19-1. Fusing Unit Drive Mechanism ................................................................. M-119 (1) Upper Fusing Roller .......................................................................... M-119 (2) Lower Fusing Roller .......................................................................... M-119 (3) Fusing Rollers Drive Mechanism ....................................................... M-120 (4) Fusing Rollers Drive Control ............................................................. M-121 (5) Fusing Speed Switching Control ....................................................... M-121 19-2. Fusing Roller Pressure Mechanism ........................................................ M-122 19-3. Fusing Temperature Control ................................................................... M-123 19-4. Fusing Oil Application/Collection Mechanism ......................................... M-125 (1) Fusing Oil Application Drive Mechanism ........................................... M-126 20. EXIT UNIT SECTION ....................................................................................... M-127 21. HORIZONTAL TRANSPORT UNIT SECTION ................................................ M-128 22. POWER SUPPLY ............................................................................................ M-130 22-1. Power Lines When the Power Cord is Plugged in .................................. M-130 22-2. Power Lines When the Power Switch is Turned ON .............................. M-131 22-3. Power Supplies ON/OFF Control ........................................................... M-132 22-4. CPU Reset Function ............................................................................... M-132 22-5. Power Supply Cooling Mechanism ......................................................... M-132 23. MEMORY BACKUP ......................................................................................... M-133
iii
1154SBG0100A
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 provided 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 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: 8mW Wave Length: 780nm
G-1
For Europe 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 8mW and the wavelength is 780nm.
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 8mW og blgelengde er 780nm.
G-2
Laser Safety Labels Label on copy machine surface Laser safety labels are attached on the outside of the copy machine as shown below.
For Europe
CLASS 1 LASER PRODUCT LASER KLASSE 1 PRODUKT
For United States
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
WARNING This devlce complles with Part15 of theFCC Rules.Operation is subject to the followin two conditions : (1) this device may not cause harmfulmInterference. and (2) this device mutst accept any interference recelved. Including Interference that may cause undesired operation.
· This Class A digital apparatus complies with Canadian ICES-003. · Cet appareil numérique de la classe A est conforme à la norme NMB-003 du Canada.
Model Input Total
W LISTED 199C I.T.E.
Hz A
C
UL .
UL .
Serial No. MINOLTA CO., LTD.
1154O048AD 1154O048AD
G-3
Label inside copy machine The following laser safety label will be attached inside the copy machine as shown below.
@
CAUTION- INVISIBLE LASER RADIATION WHEN OPEN AVOID EXPOSURE TO BEAM VORSICHT- UNSICHTBARE LASERSTRAHLUNG WENN ABDECKUNG GEÖFFNET NICHT DEM STRAHL AUSSETZEN VARO! AVATTAESSA OLET ALTTIINA NÅKYM ÅTTÖM ÄLLE LASERSÄTEILYLLE ÄLÄ KATSO SÄTEESEEN ADVARSEL- USYNLIG LASERSTR Å LING VEDÅ BNING UNDGÅ UDSÆTTELSE FOR STRÅLING VARNING- OSYNLIG LASERSTRÅLNING NÄR DENNA DEL ÄR ÖPPNAD STRÅLEN ÄR FARLIG
B
@
CAUTION- INVISIBLE LASER RADIATION WHEN OPEN AVOID EXPOSURE TO BEAM VORSICHT- UNSICHTBARE LASERSTRAHLUNG WENN ABDECKUNG GEÖFFNET NICHT DEM STRAHL AUSSETZEN VARO! AVATTAESSA OLET ALTTIINA NÅKYM ÅTTÖM ÄLLE LASERSÄTEILYLLE ÄLÄ KATSO SÄTEESEEN ADVARSEL- USYNLIG LASERSTR Å LING VEDÅ BNING UNDGÅ UDSÆTTELSE FOR STRÅLING VARNING- OSYNLIG LASERSTRÅLNING NÄR DENNA DEL ÄR ÖPPNAD STRÅLEN ÄR FARLIG
B B
CAUTION- INVISIBLE LASER RADIATION WHEN OPEN AVOID EXPOSURE TO BEAM VORSICHT- UNSICHTBARE LASERSTRAHLUNG WENN ABDECKUNG GEÖFFNET NICHT DEM STRAHL AUSSETZEN VARO! AVATTAESSA OLET ALTTIINA NÅKYM ÅTTÖM ÄLLE LASERSÄTEILYLLE ÄLÄ KATSO SÄTEESEEN ADVARSEL- USYNLIG LASERSTR Å LING VEDÅ BNING UNDGÅ UDSÆTTELSE FOR STRÅLING VARNING- OSYNLIG LASERSTRÅLNING NÄR DENNA DEL ÄR ÖPPNAD STRÅLEN ÄR FARLIG
For United States
EXPOSURE
0947-7127-01
Invisible laser radiation when open.
AVOID DIRECT TO BEAM
DANGER
For United States
1154M085AD
AVOID DIRECT TO BEAM
Invisible laser radiation when open.
DANGER
EXPOSURE
0947-7127-01
For Europe
@
CAUTION- INVISIBLE LASER RADIATION WHEN OPEN AVOID EXPOSURE TO BEAM VORSICHT- UNSICHTBARE LASERSTRAHLUNG WENN ABDECKUNG GEÖFFNET NICHT DEM STRAHL AUSSETZEN VARO! AVATTAESSA OLET ALTTIINA NÅKYM ÅTTÖM ÄLLE LASERSÄTEILYLLE ÄLÄ KATSO SÄTEESEEN ADVARSEL- USYNLIG LASERSTR Å LING VEDÅ BNING UNDGÅ UDSÆTTELSE FOR STRÅLING VARNING- OSYNLIG LASERSTRÅLNING NÄR DENNA DEL ÄR ÖPPNAD STRÅLEN ÄR FARLIG
B
For Europe
1154M085AD
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. 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, jos se on virheellisesti asennettu. Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiin. Hävitä Käytetty paristo valmistajan ohjeiden mukaisesti.
G-5
1154SBG0200A
2
Type
SPECIFICATIONS
Freestanding Stationary Scanning in the main-scanning direction with a reduction-type color CCD (RGB 3 lines) sensor 400 dpi 400 dpi × 400 dpi 400 dpi × 400 dpi Electrostatic dry powdered image transfer to plain paper Four-way system · Multi Bypass Table: 50 sheets of paper · Middle Drawer (universal type): 250 sheets of paper · Upper and Lower Drawer (fixed-size type): Each holding up to 500 sheets of paper Laser Diode 1 + Polygon Mirror New Micro-Toning System Scorotron system (single-wire DC() + grid mesh) Static charge attraction system (corotron charger + attraction roller + backup mechanism) Static image transfer system (corotron charger + backup mechanism) Static charge separating system (corotron charger + separator fingers + film pressure mechanism) Fur brush, oil roller Cleaning Blade + PC Drum Charge Neutralizing Corona Ozone Filters Two lamp-heated rollers Static charge neutralizing (corotron charger) OPC-MLII (Organic Photoconductor) Sheet, book, and three-dimensional objects weighing up to 2 kg or 4-1/2 lbs. Metric - A3L Inch - 11" × 17" L Multi Bypass Table: Metric - A3 wide L (305 mm × 457 mm) to A5L, A6 thick paper Inch - 12" × 18" to 5-1/2" × 8-1/5"L, 4" × 6" thick paper Upper/Middle/Lower Drawer: Metric - A3L to A5L Inch - 11" × 17"L to 5-1/2" × 8-1/2" L
Platen Type Original Scanning Resolution Scanning Density Print Density Copying System Paper Feeding System
Exposure System Developing System Charging System Paper Attraction System Image Transfer System Paper Separating System Transfer Film Cleaning System PC Drum Cleaning System Ozone Removal System Fusing System Transfer Film Charge Neutralizing PC Drum Types of Originals Maximum Size of Original Copy Paper Size
G-6
Copy Paper Type: 1st to 3rd Drawers Multi Bypass Table (automatic feeding) Plain paper (64 to 90 g/m2) Translucent paper Copy paper OHP transparencies (dedicated) Thick paper (91 to 105 g/m ) Thick paper (106 to 157 g/m ) A6 thick paper (for MH) 4" × 6" thick paper (for MC) Recycled paper Max. (width × length mm) Dimensions
2 2
r -- -- -- -- -- -- 297 × 432 mm
r --
V
r
r
V
r
Vr
-- 305 × 457 mm 140 × 182 mm [A6 thick paper 105 × 148 mm (Metric) 4" × 6" thick paper 102 × 152 mm (Inch)]
Min. (width × length mm)
140 × 182 mm
r: Reliably fed --: Unreliably fed V : Reliably fed if 20 sheets or less Warming-up Time Approx. 9 min. at ambient temperature of 20°C and rated source voltage
Warming-up Time After Energy Saver 60 sec. or less Mode First Copy Time (Upper Drawer, ×1.000, Manual Exposure Mode) Area Inch Metric Paper Size 8-1/2" × 11"L A4L Full Color 30 sec. Mono Color 14 sec.
Copying Speed for Multi-Copy Cycle (Upper Drawer, ×1.000) (copies/min.) Area Paper Size Full Color Mono Color A3L B4L Metric A4L A4C A5L 11" × 17" Inch 8-1/2" × 11"L 8-1/2" × 11"C 5-1/2" × 8-1/2"L 6 3 6 23 11 23 3 11
G-7
Multiple Copies Zoom Ratios
1 to 99 copies (count-down system) Full size × 1.000 Inch Metric Inch Metric × 1.214, × 1.294, × 2.000 × 1.154, × 1.224, × 1.414 × 0.647, × 0.733, × 0.785 × 0.707, × 0.816, × 0.866 × 0.250 to × 6.000 (in 0.001 increments) Leading edge: 8 mm [4" × 6" thick paper (Inch), A6 thick paper (Metric); 5 mm] Trailing edge: 4 mm Front/rear edge: 3 mm [4" × 6" thick paper (Inch), A6 thick paper (Metric); 5 mm] Through lens (F=5, f=61.1 mm) Halogen frost tube lamp Upper/Lower Fusing Roller surface temperature: 155°C Fusing Roller Heater Lamp (Rating) 120V/220V to 240V Upper: 650W Lower: 400W
Fixed
Enlargement Reduction Variable
Void Image Width
Lens Light Source Fusing Temperature
Power/Current Consumption (copier with full set of options) Exposure Lamp (Rating) 70V 150W Power Requirements Temperature 10 to 30°C with a fluctuation of 10°C or less per hour Dimensions Weight Options Max. Power Consumption 1500W Max. Current Consumption 13A/7A
120V, 220V to 240V; 50Hz/60Hz Humidity 25 to 85% with a fluctuation of 20% RH or less per hour Ambient Illumination 3000 lux or less Levelness 1° or less
Environmental Conditions
640 (W) × 765 (D) × 994 (H) mm (H: Up to Original Glass surface) 640 (W) × 765 (D) × 1024 (H') mm (H': up to Original Cover) 215 kg or 474 lbs. · Duplexing Document Feeder AFR-12 · ADF Kit D · 10 Bin Staple Sorter ST-103 · 10 Bin Sorter S-105 · Duplex Unit AD-7 · Editor Board E-2M · · · · · · Editor Display E-2D Mount Kit E Data Controller D-102 Plug-In Counter Large Capacity Cassette C-101 Data Terminal DT-104
Standard Accessories Exit Tray, Multi Bypass Table
G-8
1154SBG0300A
3
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. · Which is exposed to direct sunlight. · Which is in the direct air stream of an air conditioner, heater or ventilator. · Which puts the operator in the direct stream of exhaust from the copier. · Which has poor ventilation. · Where ammonia gas might be generated. · Which does not have a stable, level floor. · 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. · Which is near any kind of heating device. · Where it may be splashed with water. · Which is dirty or where it will receive undue vibration. · Which is near volatile flammables or curtains. Power Source Use an outlet with a capacity of 120V/13A, or 220V to 240V/7A or more. · 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. · Make the following checks at frequent intervals: V Is the power plug abnormally hot? V Are there any cracks or scrapes in the cord? V Has the power plug been inserted fully into the outlet? V Does something, including the copier itself, ride on the power cord? · 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. Grounding To prevent receiving electrical shocks in the case of electrical leakage, always ground the copier. · Connect the grounding wire to: V The ground terminal of the outlet. V A grounding contact which complies with the local electrical standards. · Never connect the grounding wire to a gas pipe, the grounding wire for a telephone, or a water pipe.
G-9
1154SBG0400A
4
PRECAUTIONS FOR USE
To ensure that the copier is used in an optimum condition, observe the following precautions. · 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 Power Switch while the copier 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. Operating Environment The operating environmental requirements of the copier are as follows. · Temperature: 10°C to 30°C with a fluctuation of 10°C per hour · Humidity: 25% to 85% RH with a fluctuation of 20% RH per hour Power Requirements The power source voltage requirements are as follows. · Voltage Fluctuation: AC120/230V ±10% (Copying performance assured) 15% (Paper feeding performance assured) · Frequency Fluctuation: 50/60 Hz ±0.3%
G-10
1154SBG0500A
5
HANDLING OF THE CONSUMABLES
Before using any consumables, always read the label on its container carefully. · Use the right toner. The applicable copier model name is indicated on the Toner Bottle. · Paper is apt 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. · Keep consumables out of the reach of children. · Do not touch the PC Drum with bare hands. · Store the paper, toner, and other consumables in a place free from direct sunlight and away from any heating apparatus. · 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 immediately. · 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.).
1154SBG0600A
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. · 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. · If the job requires that the power cord be left plugged in, observe the following precautions 1. Take off your watch, ring, and any other reflective object and wear laser protective goggles. 2. At the job site, select a place that is as far as possible away from the users and that is enclosed by walls. 3. Do not bring a highly reflective tool into the laser beam path during the service job.
G-11
1154SBG0700A
7
SYSTEM OPTIONS
4
5
1
2 3
1138O525AA
1144O642AA
6
1145M035AA 1144M172AB 4467U008AA 1151O007AA
9, 10 8
7
1139O0020A 1144O184AA 1144O003AB 1154O028AA
1. Data Terminal DT-104 2. Plug-In Counter 3. Duplexing Document Feeder AFR-12 4. Data Controller D-102 5. Editor Display E-2D
6. Editor Board E-2M 7. Large Capacity Cassette C-101 8. Duplex Unit AD-7 9. 10 Bin Sorter S-105 10. 10 Bin Staple Sorter ST-103
G-12
1154SBG0800A
8
HIGHLIGHTS
· The CF910 Copier is a digital full-color copier positioned as the successor to CF900 and intended for 100% customer satisfaction through the "CS-color technologies" that offer enhanced image quality, greater reliability, and better operability. · It offers even more enhanced image quality than CF900 could, has a built-in controller, and is priced low to gain a competitive edge in the market for greater sales. 1. High-quality image reproduction · Employs the "New Screen LIMOS" developed from the conventional "Screen LIMOS." · Employs an image stabilization control system using high-speed computing capabilities. · Includes an automatic gradation correction function. · Capable of reproducing text and photo and other gradation elements separately. 2. Greater ease of operation · Employs a touch panel display. · Equipped with two image quality adjustment modes, "Color Adjust Mode (Basic)" and "Color Adjust Mode (Professional)." · Provided with an image quality monitor function. · Employs several automatic functions, including Auto Color Selection (ACS), Auto Exposure, and original size detection. · Includes a job programming function. 3. Higher productivity · Postcards can be fed through the copier. · Permits a fast copying speed of 6 full-color copies/min. (A4 crosswise) and 23 monochrome copies/min. (A4 crosswise). · A maximum of 2,300 sheets of paper can be fed from a total of five different paper sources. 4. Environmental consciousness · Its body is built compact to require only a 826×765mm space for installation. · Realizes an outstanding quietness of 53.6 dB. 5. Better serviceability · Easier replacement of ROMs thanks to the flash memory card.
G-13
1154SBM0100A
1
CROSS-SECTIONAL VIEW AND PAPER PATH
· The illustration below shows where different parts of the copier are placed and how the copy paper moves through the copier. · Each of the mechanical and electrical parts is identified and located in the relevant section that appears later in this manual.
Fusing Unit
IR ST-103/ S-105 PH Unit (Upper) Transfer Unit AD-7 PC Unit PH Unit (Lower)
Developing Unit Upper Drawer Middle Drawer Lower Drawer
1154M018AF
M-1
1154SBM0200A
2
COPY PROCESS
3. Photoelectric Conversion
4. IR Image Processing
5. PH Image Processing 20. Paper Exit 19. Fusing 13. Paper Separation 6. Laser Exposure
14. Oil Cleaning 15. Toner Cleaning 16. Charge Neutralizing 11. Attraction Transfer Drum 17. Cleaning 12. Image Transfer 18. Main Erase 1. PC Drum 2. PC Drum Charging
8. Pre-Image Transfer Erase
7. Developing
10. Manual Feed
9. Paper Feeding Upper Drawer Middle Drawer Lower Drawer
1154M083AA
M-2
1. PC Drum · An electrostatic latent image is formed on the surface of a photoconductive material that coats an aluminum cylinder. · An OPC type photoconductor is used. (For details, see p. M-16.) 2. PC Drum Charging A single-wire PC Drum Charge Corona employing the Scorotron system deposits a negative DC charge across the entire surface of the PC Drum. (For details, see p. M-19.) 3. Photoelectric Conversion · The light from Exposure Lamp LA1 is directed onto the original and reflected to strike the CCD Sensor through mirrors and lens, thereby forming a reduced image of the original. · The CCD Sensor separates the light striking it into different colors using its color filters (R, G, and B), then converts it into a corresponding electrical signal and outputs the signal to the IR Image Processing Unit. (For details, see p. M-23.) 4. IR Image Processing The electrical signal output from the Photoelectric Converter is converted to 8-bit digital image signals (R, G, and B). After making some corrections, the IR Image Processing Unit outputs video signals (C, M, Y, and Bk) to the PH Image Processing Unit. (For details, see p. M-23.) 5. PH Image Processing The video signals (C, M, Y, and Bk) output from the IR Image Processing Unit go through some corrections. Following digital-to-analog conversion, these signals are then used for the control of the intensity level of the laser diode (LD1). (For details, see p. M-43.) 6. Laser Exposure The laser beam emitted by the laser diode (LD1) strikes the surface of the PC Drum to form an electrostatic latent image. (For details, see p. M-45.) 7. Developing · The toner, agitated and negatively charged in the developing unit of each color, is attracted onto the electrostatic latent image formed on the surface of the PC Drum, changing it to a visible, developed image. · AC and DC negative bias voltages are applied to the Sleeve/Magnet Roller to ensure toner transfer to the PC Drum. (For details, see p. M-53.) 8. Pre-Image Transfer Erase Light from Auxiliary Erase Lamp UN21 strikes the surface of the PC Drum to improve image transfer efficiency and, at the same time, to neutralize negative charge on those areas to which toner is not attracted. (For details, see p. M-54.) 9. Paper Feeding Paper is fed from each drawer. (For details, see p. M-74.) 10. Manual Paper Feeding The paper loaded in the Multi Bypass Table is fed. (For details, see p. M-78.)
M-3
11. Attraction The Static Charge Corona applies a positive DC corona emission to the Transfer Film, while the Static Charge Roller presses the paper against the surface of the Transfer Film so that the paper is attracted to the film by static charge. (For details, see p. M-92.) 12. Image Transfer The Image Transfer Corona applies a DC positive corona emission to the Transfer Film to attract the negatively charged toner on the surface of the PC Drum onto the surface of the paper. (For details, see p. M-96.) 13. Paper Separation · The Paper Separator Corona applies an AC corona emission to the paper to weaken the attraction of the paper to the Transfer Film. · The Lifting Finger pushes up the Transfer Film, while the Paper Separator Finger pushes down the Transfer Film so that the paper can be effectively separated from the surface of the Transfer Drum. (For details, see p. M-100.) 14. Oil Cleaning The Oil Roller collects fusing oil from the surface of the Transfer Film during 2-sided copying. (For details, see p. M-105.) 15. Toner Cleaning The Fur Brush Unit collects toner particles sticking to the surface of the Transfer Film. (For details, see p. M-108.) 16. Charge Neutralizing The Charge Neutralizing Corona showers both sides of the Transfer Film with AC and DC overlapped corona charges so that the film is neutralized. (For details, see p. M-112.) 17. Cleaning · The Pre-Cleaning Corona applies either a DC negative or AC corona emission to the surface of the PC Drum to neutralize it. · The residual toner left on the surface of the PC Drum is scraped off by the Cleaning Blade and is then conveyed by the Toner Conveying Coil to the Toner Collecting Box. (For details, see p. M-114.) 18. Main Erase Light from Main Erase Lamp LA2 neutralizes any surface potential remaining on the surface of the PC Drum. (For details, see p. M-117.) 19. Fusing · The Upper and Lower Fusing Rollers apply heat and pressure to the paper so that the four different color layers of toner lying on the surface of the paper are mixed and fused together, as well as being fixed collectively to the paper. · Fusing oil is applied to the Fusing Rollers to secure the release of the paper and to help toner be cleaned from the surfaces of the two fusing rollers. · The Oil Collecting Blade scrapes residual oil from the Lower Fusing Roller. The recovered oil is then filtered for recycling. (For details, see p. M-120.) 20. Exit The Paper Exit Roller is turned to feed the paper out of the copier. (For details, see p. M127.)
M-4
1154SBM0300A
3
DRIVE SYSTEM
· The illustration below outlines the drive system of the copier. · The directions of rotation of the motors, gears, pulleys, and belts will be found in the relevant section that appears later in this manual. Drive for Synchronizing Roller, Static Charge Roller, and Fur Brush Unit
Scanner Drive Motor
Cleaning Unit Drive Fusing Motor PC Drum Drive Motor PC Drum/ Transfer Drum
Developing Unit Drive
Flywheel Drive for Paper Take-Up, Vertical Transport, Multi Bypass,
Paper Take-Up Motor Developing Drive Motor Toner Replenishing Motor (Bk)
and Horizontal Transport
Hopper Drive
Toner Replenishing Motor (C) Toner Replenishing Motor (M) Toner Replenishing Motor (Y) Toner Transport Motor (C, M, Y)
Toner Transport Motor (Bk)
1154M066AD
M-5
1154SBM0400A
4
OPERATING SEQUENCE
Power Switch ON OFF ON ON ON ON ON ON ON ON ON Paper Dehumidifying Heater 1 to 4 H4 to H7: When Paper Dehumidifying Switch S2 is ON. Power Supply Cooling Fan Motor M20 Ozone Ventilation Fan Motor M5 Toner Suction Fan Motor M4 Fusing Unit Cooling Fan Motor M14 PH Cooling Fan Motor M13 PC Drum Charge Wire Cleaning Motor M3: Cleans the PC Drum Charge Corona wire. Scanner Motor M1: Scanner stops at a point under the shading sheet. Exposure Lamp LA1: (See 9-4. Exposure Lamp Control.) Paper Take-Up Motor M15
Approx. 0.4 sec. ON ON ON ON ON ON ON PC Drum Drive Motor M18 PC Drum Charge Corona output ATDC bias Main Erase Lamp LA2 Auxiliary Erase Lamp UN21 Pre-Cleaning Charge Corona (AC) Transfer Drum Retract Solenoid SL12 A
Approx. 0.2 sec. ON Fusing Motor M17: Energized when 140°C is detected if the temperature detected by Upper Fusing Roller Thermistor TH1 is less than 140°C. Developing Drive Motor M16 Developing bias (-DC) H L Transfer Drum Reference Position Sensor 1 PC20 OFF
ON ON
Approx. 2.6 sec.
C
Transfer Drum Retract Solenoid SL12
M-6
C correction (See 6-2. Image Stabilization System Control.) Transfer Drum Reference Position Sensor 1 PC20 Transfer Film cleaning mode: (See 16-7. Toner Cleaning.) OFF OFF H L Developing Drive Motor M16 Developing bias (DC) Transfer Drum Reference Position Sensor 1 PC20
H L
Approx. 0.1 sec. OFF OFF Auxiliary Erase Lamp UN21 Pre-Cleaning Charge Corona (AC)
Approx. 1 sec. OFF Main Erase Lamp LA2 B Approx. 1.2 sec. ON Transfer Drum Retract Solenoid SL12 OFF PC Drum Drive Motor M18 OFF Paper Take-Up Motor M15 OFF ATDC bias OFF PC Drum Charge Corona output Approx. 2 sec. ON OFF Paper Dehumidifying Heater 1 to 4 H4 to H7 Transfer Drum Retract Solenoid SL12 Fusing Roller Heater Lamp temperature control completed: Warm-up completed OFF Fusing Motor M17
M-7
Start key ON OFF
(Upper Drawer feeding, single copy, full size, mono color)
Paper Dehumidifying Heater 1 to 4 H4 to H7: When Paper Dehumidifying Switch S2 is ON. Operation "A" when the Power Switch is turned ON ON Developing Drive Motor M16 ON Developing bias (-DC) H L Transfer Drum Reference Position Sensor 1 PC20 Approx. 1.5 sec. ON Charge Neutralizing Corona output (AC)
Approx. 5 sec. OFF Approx. 2.3 sec. ON ON Upper Drawer Paper Take-Up Clutch CL11 Transport Roller Clutch CL15 H L Upper Drawer Paper Take-Up Sensor PC12 Charge Neutralizing Corona output (AC)
Paper take-up
Approx. 0.6 sec. OFF Upper Drawer Paper Take-Up Clutch CL11 H L Paper Leading Edge Detecting Sensor PC18 OFF Transport Roller Clutch CL15 Approx. 2.6 sec. OFF Transfer Drum Retract Solenoid SL12 ONOFF Exposure Lamp LA1: (See 9-4. Exposure Lamp Control.) ONOFF Scanner Motor M1: (See 9-6. Scanner Motor Drive Control.) ONOFF Laser Diode: (See 10. PRINTERHEAD (PH) SECTION) H L Transfer Drum Reference Position Sensor 1 PC20 Exposure
D
M-8
D ON ON Static Charge Roller Solenoid SL13 Backup Blade 2 Solenoid SL19
Approx. 0.2 sec. ON ON Synchronizing Roller Clutch CL21 Transport Roller Clutch CL15
Approx. 0.1 sec. ON Static Charge Corona output L H Paper Leading Edge Detecting Sensor PC18 Paper attraction
Approx. 0.1 sec. OFF OFF OFF OFF OFF Synchronizing Roller Clutch CL21 Transport Roller Clutch CL15 Static Charge Roller Solenoid SL13 Backup Blade 2 Solenoid SL19
Static Charge Corona output H L Transfer Drum Reference Position Sensor 1 PC20 ON Fusing Motor M17 Approx. 0.8 sec. ON ON ON OFF Developer Supply Clutch (C) CL17 Developing bias (C) (AC) Toner Transport Motor (C, M, Y) M23 Developer Supply Clutch (C) CL17 Developing
Approx. 0.2 sec. OFF OFF Developing bias (C) (AC) Toner Transport Motor (C, M, Y) M23
Approx. 1.9 sec. ON ON Backup Blade 1 Solenoid SL18 Image Transfer Corona output
Approx. 0.3 sec. OFF ON OFF OFF E F Pre-Cleaning Charge Corona output (-DC) Pre-Cleaning Charge Corona output (AC) Backup Blade 1 Solenoid SL18 Image Transfer Corona output Image transfer
M-9
E
F Approx. 0.2 sec. ON OFF Pre-Cleaning Charge Corona output (-DC) Pre-Cleaning Charge Corona output (AC)
Approx. 0.3 sec. OFF ON H L Pre-Cleaning Charge Corona output (-DC) Pre-Cleaning Charge Corona output (AC)
Transfer Drum Reference Position Sensor 2 PC28 Approx. 1.4 sec. ON ON ON OFF OFF OFF Approx. 1.5 sec. ON Charge Neutralizing Corona output (AC + DC) Paper Separator Finger Solenoid SL14 Lifting Finger Solenoid SL16 Paper Separator Corona output Separation Lifting Finger Solenoid SL16 Paper Separator Corona output Paper Separator Finger Solenoid SL14
Approx. 5.1 sec. OFF Charge Neutralizing Corona output (AC + DC) H L Transfer Drum Reference Position Sensor 1 PC20 correction (See 6-2. Image Stabilization System Control.) Transfer Film toner cleaning mode: (See 16-7. Toner Cleaning.) OFF Fusing Motor M17 Operation "B" when the Power Switch is turned ON
M-10
1154SBM0500A
5
CONTROL BLOCK DIAGRAM
IR IR Image Processing Unit Photoelectric Converter
A/D Converter Board (PWB-B) Control Panel (UN27) IR Control Board (PWB-C) CCD Sensor Board (PWB-A)
Motor Drive Board (PWB-G) PH PH Image Processing Unit
PH Control Board (Digital) (PWB-JD)
PH Control Board (Analog) (PWB-JA)
SOS Board (PWB-S)
Laser Diode (LD1)
Fusing Unit Master Board (PWB-I) Transfer Drum
Power Supply Board (PWB-L)
Control Signal Paper Take-Up Board (PWB-K) PC Drum Image Signal
Paper Source
M-11
1154SBM0600A
6
6-1.
IMAGE STABILIZATION SYSTEM
Image Stabilization System Overview
V · · · · · V Means correction control AIDC Sensor contamination correction AIDC detection PC Drum surface potential detection Max. LD1 intensity calculation Operations (setting VG and VB) ATDC control (C, M, Y) Control (Sensor) · AIDC Sensor UN20 · Surface Potential Detection Sensor UN22 · PC Drum Life Counter · Humidity Sensor UN23 · ATDC Sensors UN33, 34, 35 · · · · Developer Life Counter AIDC Sensor UN20 Humidity Sensor UN23 PC Drum Heater Control Board PWB-W · Humidity Sensor UN23
1154SBM0601A
Purpose · To stabilize image density · To stabilize gradation
· To stabilize the amount of toner attracted · To stabilize the V Black toner replenishment control amount of toner attracted · To stabilize PC V PC Drum temperature control Drum sensitivity · To stabilize V Static Charge, Image Transfer, Paper paper attration, Separator, and Charge Neutralizing image transfer, Corona output control paper separation, and charge neutralization
V An explanation is given of each control other than correction control in the relevant section that follows the current one.
Paper Separator Transformer Paper Separator Corona
Fur Brush Fur Brush Bias Transformer Image Transfer Transformer Charge Neutralizing Transformer Static Charge Transformer AIDC Sensor Image Transfer, Paper Separation, Charge Neutralizing Toner Replenishing Motor
Charge Neutralizing Corona
Image Transfer Corona Static Charge Corona
PC Drum Charge Corona PC Drum Heater LD1 PC Drum Heater Control System V0 Sensor
PC Drum Charge Transformer
LD1 Driver
PC Drum Heater Control Board Developing Bias
Developing Bias Transformer
ATDC Control
ATDC Sensor
Correction Control
Black Toner Replenishing Control
Humidity Sensor
Developer Life Counter
1144M020AA
M-12
1154SBM0602A
6-2.
Image Stabilization System Control
Summary · The copier uses the data obtained through AIDC detection and PC Drum surface potential detection to perform various operations, thereby finding the optimum correction exposure curve for image stabilization control. Sensitometry
ID (Image Density) Reversal Developing Characteristics VB Image Density Characteristics =1
PC Drum Surface Potential curve
Image Input Data
PC Drum Light Decay Curve
Laser Radiation Characteristics
1144M161CA
Laser Light Intensity
Operation Flow
Start Key ON Power Switch S1 ON Misfeed or malfunction reset
Copy cycle executed
(1)
AIDC Sensor UN20 fine adjustment
Is the copy cycle completed?
(2), (3)
· AIDC detection · PC Drum surface potential detection (Vi detection)
(5)
Operations · Drum charging/image transfer characteristics · Developing characteristics · Grid voltage (VG) · Developing bias · Exposure curve · Maximum intensity of LD1 light
"Image Adjust" of Service Mode PRT Max Density PRT Hilight Background Voltage
End
M-13
1. AIDC Sensor UN20 Fine Adjustment · This function corrects variations in the AIDC detection level (the amount of toner attracted to the surface of the PC Drum) that occur due to a contaminated UN20. · It is carried out when the Power Switch is turned ON. Operation Flow A. UN20 detects the background level on the drum surface. B. Density patterns 1 to 5 of five different gradation levels in cyan (C) and black (Bk) are produced, respectively, on the surface of the PC Drum to let UN20 detect the amount of toner attracted. C. The toner density characteristics are detected through these steps of A and B and according to the solid level of cyan (C) and black (Bk) detected by "AIDC Offset Adjustment." (See the chart below.) D. Requirements of the amount of toner attracted (a, b and c) for AIDC detection are plotted on the chart. E. Of density patterns 1 through 5, the ones that are closest to a, b and c, respectively are selected. F. The three density patterns selected are used in AIDC detection. V These operations are performed while the PC Drum turns one complete turn.
(V) Background Level
1 UN20 Output
2 3 4 5 Solid Pattern
a b c Amount of Toner Attracted (mg/cm 2 )
1144M162CA
M-14
2. AIDC Detection · Three density patterns selected through the AIDC Sensor UN20 fine adjustment are produced on the surface of the PC Drum for each color (in the order of Y, M, C, and Bk) to allow UN20 to detect the amount of toner attracted to the drum surface. · The amount readings are used in "5. Operations" that follows. · The detection is made when the Power Switch is turned ON, a misfeed or malfunction is reset, and at the end of the copy cycle. · It occurs while the PC Drum turns one complete turn.
3. PC Drum Surface Potential Detection (Vi Detection) · The PC Drum surface potential is detected by Surface Potential Detection Sensor UN22. · Ten latent image patterns with varying gradation levels are produced on the surface of the PC Drum and UN22 detects the surface potential of each pattern. · The surface potential readings are used in "5. Operations" that follows. When Power Switch S1 is turned ON: · The intensity of LD1 light and grid voltage (VG) are varied in three steps and, for each of these three steps, ten latent image patterns of varying gradation levels are produced for surface potential detection. (The PC Drum turns three turns.) Other than above · Ten latent image patterns with different gradation levels are produced with LD1 and VG remaining the same, for each of which the surface potential is detected. · Surface potentials of a total of ten patterns are detected.
4. Max. LD1 Intensity Correction · To prevent the copy image density from being changed by changes in the PC Drum sensitivity during a multi-copy cycle, the maximum intensity of LD1 light (PMAX) is corrected at a timing between copies. PMAX Correction Operation A. The VG value of Black of the first copy is directly applied to the PC Drum without any correction. B. The surface of the PC Drum is illuminated with the PMAX of Black for the first copy. C. Surface Potential Detection Sensor UN22 measures the surface potential of the PC Drum. D. Using the measurement result, the copier calculates an optimum PMAX to make the necessary correction.
5. Operations · Based on the copier conditions found through the AIDC detection and PC Drum surface potential detection (Vi detection), the CPU computes the PC Drum charge, image transfer, PC Drum sensitivity and developing characteristics, grid voltage (VG), developing bias (VB), exposure curve and maximum intensity of LD1 light. By setting the parameters, the CPU maintains the best possible image quality. · The values set for "PRT Max Density," "PRT Hilight," and "Background Voltage" of "Image Adjust" available from the Service Mode are incorporated during these operations.
M-15
1154SBM0700A
7
PC DRUM SECTION
· The photoconductive drum used in this copier is the organic photoconductor (OPC) type. · The drum consists of two distinct, light-sensitive, organic semiconductor materials on an aluminum alloy base. The outer of the two layers is called the Charge Transport Layer (CTL), while the inner layer is called the Charge Generating Layer (CGL). · It is a type that is sensitive to the near infrared wavelength. · Size = 100 × 350mm CGL 350 mm CTL
100
PC Drum Aluminum Cylinder
1076M043
1074M017
Handling Precaution The PC Drum exhibits light fatigue after being exposed to light for a long time, which results in its sensitivity being changed. Therefore, always wrap the drum in the PC Drum Cloth or a soft cloth immediately after it has been removed from the copier.
1154SBM0701A
7-1.
Grounding of the PC Drum
· The potential on the surface of the PC Drum exposed to the laser beam is grounded through the Ground Plate which is in contact with the drum shaft.
Flywheel Ground Plate Drum Shaft
M18 PC Drum
1154M024AC
M-16
1154SBM0702A
7-2.
PC Drum Drive Mechanism
· The PC Drum is driven by PC Drum Drive Motor M18. · A flywheel mounted on the drum shaft smooths out power surges occurring due to backlash in the gears.
Flywheel Ground Plate Drum Shaft
M18 PC Drum Control Signal M18 PWB-I PJ8I-3B PWB-I PJ8I-4B Control Signal Transfer Drum Reference Position Sensor PC20 Energized H L Blocked Deenergized H H Unblocked Wiring Diagram 14-G
1154M024AC
Wiring Diagram
PWB-I PJ4I-5B
L
H
15-E
Timing Chart
Start Key ON PC20 H L Approx. 0.4 sec. Approx. 2.3 sec.
Paper Take-Up ON Motor (M15) OFF ON M18 OFF
1154T21MCB
M-17
1154SBM0703A
7-3.
PC Drum Temperature Control
· PC Drum Heater H3 is installed inside the PC Drum to maintain drum sensitivity and prevent condensation from forming on the drum surface. · H3 is turned ON or OFF by a temperature-sensitive reed switch installed inside the PC Drum, keeping the drum surface temperature at 35±5°C. · H3 is a 50W heater. · Power to H3 is supplied through the electrodes on the front flange face. · Assuming that there is a temperature difference of 2°C between the outside and inside of the PC Drum, the reed switch is turned OFF when the temperature reaches 37°C and ON when it becomes lower than 33°C. · Power Switch S1 is turned ON. · The temperature-sensitive reed switch is turned ON.
· The temperature-sensitive reed switch is turned OFF. · S1 is turned OFF. · A misfeed or malfunction is reset or a door is opened.
ON H3 OFF Temperature- ON Sensitive Reed Switch OFF
( C)
PC Drum Surface Temperature
35
0
Time
1144M09TCB
PC Drum Temperature-Sensitive Reed Switch
Electrodes H3 Front Flange
1144M025AA
M-18
1154SBM0800A
8
PC DRUM CHARGING SECTION
· The PC Drum Charge Corona has a Scorotron grid to deposit a negative DC charge evenly across the surface of the PC Drum. · The grid voltage (VG) applied to the grid mesh is kept in the range between 400 and 1100V by the Constant-Voltage Circuit in High Voltage Unit 1 HV1. The constant voltage of HV1 is determined through image stabilization control. Grid Mesh
Corona Wire HV1 PC Drum
Constant-Voltage Circuit
1144M026AA 1154SBM0801A
8-1.
PC Drum Charge Corona ON/OFF Control
Control Signal Energized L Deenergized H Wiring Diagram 15-I
High Voltage Unit 1 HV1 (PC Drum Charge Corona)
PWB-I PJ11I-9
Control Signal Transfer Drum Reference Position Sensor PC20 PWB-I PJ4I-5B
Blocked L
Unblocked H
Wiring Diagram 15-E
Start Key ON PC Drum Drive ON Motor (M18) OFF ON OFF
H L
1144M10TCC
HV1
PC20
End of Copy Cycle
M-19
1154SBM0802A
8-2.
PC Drum Charge Corona Wire Cleaning Mechanism
· Rotation of PC Drum Charge Wire Cleaning Motor M3 turns the screw shaft, which moves the cleaner mounted on the screw shaft to clean the corona wire. · Charge Cleaner Home Position Sensor PC16 and Charge Cleaner Return Position Sensor PC17 detect the point at which the direction of M3 rotation is switched from forward to backward, or vice versa, and at which M3 is stationary, thereby moving or stopping the cleaner. Cleaning Conditions · Power Switch S1 is turned ON. · The Front Door is opened and closed. · The EP-NET remote control PC Drum Charge Corona wire cleaning command is received in standby state. · At the end of a multi-copy cycle making 100 copies
PC17 Cleaner Cleaner M3 Charge Corona Wire Screw Shaft
1154M026AD 1154M071AC
PC16
Screw Shaft
Control Signal M3 PWB-I PJ3I-5B PWB-I PJ3I-4B Control Signal PC16 PC17 PWB-I PJ8I-10B PWB-I PJ8I-9B
Cleaning Conditions Met PC16 H L H L Approx. 0.1 sec. Approx.1 sec. M3 ON (Forward Rotation) OFF Approx. 0.1 sec. M3 ON (Backward Rotation) OFF
1154T22MCB
Forward Rotation L H
Backward Rotation H L
Stop H H Return Position H L
Wiring Diagram 15-D
Home Position L H
Wiring Diagram 14-F 14-F
PC17
Approx. 0.1 sec. Approx.1 sec.
M-20
1154SBM0803A
8-3.
PC Drum Charge Section Ozone Filter
· Ozone produced by the PC Drum Charge Corona is absorbed by the Ozone Filter from the air blown against the back of the PC Drum Charge Corona by Ozone Ventilation Fan Motor M5.
PC Drum Charge Corona
M5
Ozone Filter
1154M093AA
Control Signal M5 PWB-I PJ3I-6B Energized L Deenergized H Wiring Diagram 15-D
S1 ON M5 ON OFF
Power OFF
1144M12TCA
M-21
1154SBM0900A
9
IMAGE READER (IR) SECTION
5 4 2 3 6 7 8 9 10 11 12 1 13 14
15 16 18 19 20 21 24 23 1. DC Power Supply 2 PU2 2. Original Glass Cooling Fan Motor M2 22
1154M019AC
17
13. Scanner Home Position Sensor PC1 14. Cable Pulley
3. Original Cover Angle Detecting Sensor 15. Cable PC22 16. IR Control Board PWB-C 4. Actuator 5. Motor Drive Board PWB-G 6. Scanner Motor M1 7. Original Size Detecting Sensor 3 SE3 8. Original Size Detecting Sensor 4 SE4 9. IR Section Thermostat TS3 10. IR Cooling Fan Motor 1 M24 11. CCD Sensor 12. IR Cooling Fan Motor 2 M25 17. A/D Converter Board PWB-B 18. CCD Sensor Board PWB-A 19. Exposure Lamp LA1 20. Scanner 21. 2nd/3rd Mirror 22. Size Reset Switch S12 23. Original Size Detecting Sensor 1 SE1 24. Original Size Detecting Sensor 2 SE2
M-22
1154SBM0901A
9-1.
IR Image Processing
1. Photoelectric Conversion
2. Analog-to-Digital Conversion
3. Shading Correction
4. Line-to-Line Variation Correction
5. Zoom/Movement Processing
6. Histogram Making (ACS/AE Processing)
7. Image Data Editing
Interface
8. AE Processing
10. Color Correction (Reflection/Density Conversion, Masking, UCR/BP)
9. Image Area Discrimination
11. Miscellaneous Processing (Improved Reproduction of Black Characters, Edge Emphasis, 3 × 3 Crossing on Edges, Smoothing, Color Balance, Gamma () Correction)
To Printer Head (PH)
M-23
1
Photoelectric Conversion: PWB-A · A reduction-type color CCD Sensor is used. · The R, G, and B chips of the CCD Sensor read the light reflected off the original and convert the optical data into a corresponding analog electric signal. · To make data processing faster, data transfer and output are done through two channels, one for even-numbered pixels and the other for odd-numbered pixels.
2
Analog-to-Digital Conversion: PWB-B The odd and even analog signals output from the CCD Sensor chips are synthesized to form a single string of signal data which is in turn converted to 8-bit digital signals.
3
Shading Correction: PWB-C An error is corrected that occurs due to variations in sensitivity of each CCD chip and the light distribution varying along the length of Exposure Lamp LA1. Operation: 1. Before the start of each copy cycle, light from LA1 strikes the shading sheet and the CCD Sensor reads the light reflected off this sheet. 2. This reading is compared with the shading sheet reading reference value (white reference value = max. value of image data) to determine the correction value for each pixel. 3. When the image is scanned, each pixel data is corrected with the above correction value. To prevent adverse effects on the image due to dust on the shading sheet, the maximum value of the readings taken in the sub-scanning direction of the shading sheet is taken. This is called peak value hold.
4
Line-to-Line Variation Correction: PWB-C · The R, G, and B chips of the CCD Sensor are placed so that there is a gap of 4 lines in the sub-scanning direction between the two adjacent chips (R G B). This results in a deviation in the scanning position of the original. (The slower the scanning speed, the greater the amount of deviation.) · A memory called FIFOV is used to compensate for this deviation. It retards the output timing for R and G data to match it with that for B data. R data G data B data FIFO FIFO FIFO Output Output Output
V FIFO (first-in-first-out): Data is output in the same order as it is input.
M-24
5
Zoom/Movement Processing: PWB-C · The image is edited according to the editing features selected on the control panel (enlargement/reduction, image moving, image repeat) · Two memories (FIFOs) are used to edit the image as required. Input Output FIFO FIFO (Write) (Read) Zoom · The synchronous timing of the input data (read) and output data (read) is varied to decrease (reduction) or increase (enlargement) the number of data readings, thereby reducing or enlarging the image in the main scanning direction. · The image is reduced or enlarged in the sub-scanning direction by varying the speed at which the Scanner moves. Movement · The start position of the output data (read) with respect to the input data (read) is varied to move the image in the main scanning direction. · The image is moved in the sub-scanning direction by varying the scan start timing of the Scanner. Image Repeat · The input data (read) stored in the memory is output (read) several times.
M-25
6
Histogram Making: PWB-C
ACS: Auto Color Selection
· The scanning area is divided into 256 blocks [512 (main-scanning) × 512 (subscanning) dots]. · The image data of the original (excluding the edges) is sampled during the prescan after the shading correction (at a rate of every 4 dots both in the main- and sub-scanning directions). · A histogram is then generated of saturation and lightness of each block (256 blocks). [This generates a lightness histogram for AE processing. See 8. AE Processing.] · The histogram is used to determine whether each block on the original (excluding the edges) is monochrome or colored. · Based on the results of the color/monochrome evaluation made of each block, the copier determines whether the entire original is colored or monochrome (ACS) . Block Division Edge Edge Original a Edge Block Configuration Edge 512 dots
512 dots 4 dots each
4 dots each b
1154M076AA 1154M084AA
V a (16 blocks) × b (16 blocks) = Scanning area (256 blocks) Histogram Colored Monochrome Monochrome Colored
Frequency
Frequency
Low 7
Saturation
High
1154M077AA
Dark
Lightness
Light
1154M078AA
Image Data Editing: PWB-C · R, G, and B data are converted to V (value), Cr, and Cb (color component) for color adjustments (Brightness, Saturation, and Hue). · The data are also synthesized with the image data (V, CR, Cb) from an external device (Editor) via an interface to carry out various types of image synthesis processing.
M-26
8
AE Processing: PWB-C · The scanning area is divided into two in the feeding direction [at a point 216 mm from the trailing edge of the original (excluding the edge)]. V The area is not divided if, depending on the size of the original, the division point falls within, or outside, the edge on the leading edge side of the original. · Lightness data readings are tallied up for each four gradation levels using the image data sampled through "Histogram Making." · The lightness data readings tallied up for each four gradation levels and in two parts are totaled to generate one lightness histogram (for AE processing). · From the histogram with lightness blocked into four gradation levels, the local maximum value of each block (gradation level with the greatest frequency in each block) is extracted. · Calculation is made to determine if there is any gradation level extracted, the sum of frequency of ±8 gradation levels of which accounts for 12.5% or more of the sum of frequency of the entire original. (Processing is done in the order of the gradation level of higher lightness.) · If there is, AE level (local minimum value) is set at the lightness level which is 1/16 or less of the lightness frequency at that local maximum value. · If not, the AE level is determined according to the original mode. · The AE processing table is determined based on the AE level. · Background processing (AE processing) is performed as the AE processing table is determined. Divided into two in FD direction Edge Division point Edge Edge Leading edge of original Edge 216mm Original Trailing edge of original Crosswise Direction
1154M079AA
Lightness histogram Frequency Monochrome
Feeding Direction 4 gradation levels Local maximum value [AE level setting according to original mode] Original mode Map Photo Text Text/photo Lightness High
1154M080AB
AE level 224 240 104 - 240 136 - 240
Color
Low
If a foggy background is produced despite the AE processing, further adjustments can be made with "AE Adjust" of "Image Adjust" available from the Service Mode menu.
M-27
9
Image Area Discrimination: PWB-C · The image areas (color edge area, black edge area, dot area, continuous gradation area) are discriminated to optimize edge emphasis, smoothing and other processing just right for the