Mita PointSource Ci7060 SM.pdf

7/27/2019 Mita PointSource Ci7060 SM.pdf

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PointSource Ci 7600 (MCA) S/M

SERVICEMANUALPublished in Mar. 99

5BL70760

R

PointSource

Ci 7600

Point

Source

Ci

7600


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CAUTION

DANGER OF EXPLOSION IF BATTERY IS INCORRECTLY RE-PLACED. REPLACE ONLY WITH THE SAME OR EQUIVALENTTYPE RECOMMENDED BY THE MANUFACTURER. DISPOSEOF USED BATTERIES ACCORDING TO THE MANUFAC-TURERS INSTRUCTIONS.

ATTENTION

IL Y A DANGER DEXPLOSION SIL Y A REMPLACEMENT IN-CORRECT DE LA BATTERIE. REMPLACER UNIQUEMENTAVEC UNE BATTERIE DU MME TYPE OU DUN TYPE REC-OMMAND PAR LE CONSTRUCTEUR. METTRE AU RBUT

LES BATTERIES USAGES CONFORMMENT AUX INSTRUC-TIONS DU FABRICANT.


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SERVICE

MANUAL

PointSource

Ci 7600


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Safety precautions

This booklet provides safety warnings and precautions for our service

personnel to ensure the safety of their customers, their machines as wellas themselves during maintenance activities. Service personnel areadvised to read this booklet carefully to familiarize themselves with thewarnings and precautions described here before engaging inmaintenance activities.


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Safety warnings and precautions

Various symbols are used to protect our service personnel and

customers from physical danger and to prevent damage to their

property. These symbols are described below:

DANGER: High risk of serious bodily injury or death may result frominsufficient attention to or incorrect compliance with warningmessages using this symbol.

WARNING: Serious bodily injury or death may result from insufficient

attention to or incorrect compliance with warning messagesusing this symbol.

CAUTION: Bodily injury or damage to property may result frominsufficient attention to or incorrect compliance with warningmessages using this symbol.

Symbols

The triangle ( ) symbol indicates a warning including dangerand caution. The specific point of attention is shown insidethe symbol.

General warning.

Warning of risk of electric shock.

Warning of high temperature.

indicates a prohibited action. The specific prohibition isshown inside the symbol.

General prohibited action.

Disassembly prohibited.


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indicates that action is required. The specific actionrequired is shown inside the symbol.

General action required.

Remove the power plug from the wall outlet.

Always ground the copier.

1. Installation Precautions

WARNING

Do not use a power supply with a voltage other than that specified.Avoid multiple connections to one outlet: they may cause fire or electricshock. When using an extension cable, always check that it isadequate for the rated current. ...............................................................

Connect the ground wire to a suitable grounding point. Not groundingthe copier may cause fire or electric shock. Connecting the earth wireto an object not approved for the purpose may cause explosion orelectric shock. Never connect the ground cable to any of the following:gas pipes, lightning rods, ground cables for telephone lines and waterpipes or faucets not approved by the proper authorities. ........................

CAUTION:

Do not place the copier on an infirm or angled surface: the copier maytip over, causing injury. ...........................................................................

Do not install the copier in a humid or dusty place. This may cause fireor electric shock. .....................................................................................

Do not install the copier near a radiator, heater, other heat source or

near flammable material. This may cause fire. .......................................

Allow sufficient space around the copier to allow the ventilation grills tokeep the machine as cool as possible. Insufficient ventilation maycause heat buildup and poor copying performance. ...............................


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Always handle the machine by the correct locations when moving it. ....

Always use anti-toppling and locking devices on copiers so equipped.Failure to do this may cause the copier to move unexpectedly ortopple, leading to injury. ..........................................................................

Avoid inhaling toner or developer excessively. Protect the eyes. If toneror developer is accidentally ingested, drink a lot of water to dilute it inthe stomach and obtain medical attention immediately. If it gets into theeyes, rinse immediately with copious amounts of water and obtainmedical attention. ....................................................................................

Advice customers that they must always follow the safety warnings andprecautions in the copiers instruction handbook. ...................................

2. Precautions for Maintenance

WARNING

Always remove the power plug from the wall outlet before startingmachine disassembly. ............................................................................

Always follow the procedures for maintenance described in the servicemanual and other related brochures. ......................................................

Under no circumstances attempt to bypass or disable safety featuresincluding safety mechanisms and protective circuits. .............................

Always use parts having the correct specifications. ...............................

Always use the thermostat or thermal fuse specified in the servicemanual or other related brochure when replacing them. Using a pieceof wire, for example, could lead to fire or other serious accident. ...........

When the service manual or other serious brochure specifies a

distance or gap for installation of a part, always use the correct scaleand measure carefully. ...........................................................................

Always check that the copier is correctly connected to an outlet with aground connection. .................................................................................


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Check that the power cable covering is free of damage. Check that thepower plug is dust-free. If it is dirty, clean it to remove the risk of fire orelectric shock. .........................................................................................

Never attempt to disassemble the optical unit in machines using lasers.Leaking laser light may damage eyesight. ..............................................

Handle the charger sections with care. They are charged to highpotentials and may cause electric shock if handled improperly. .............

CAUTION

Wear safe clothing. If wearing loose clothing or accessories such asties, make sure they are safely secured so they will not be caught inrotating sections......................................................................................

Use utmost caution when working on a powered machine. Keep awayfrom chains and belts..............................................................................

Handle the fixing section with care to avoid burns as it can beextremely hot. .........................................................................................

Check that the fixing unit thermistor, heat and press rollers are clean.Dirt on them can cause abnormally high temperatures. .........................

Do not remove the ozone filter, if any, from the copier except forroutine replacement. ...............................................................................

Do not pull on the AC power cord or connector wires on high-voltagecomponents when removing them; always hold the plug itself. ..............

Do not route the power cable where it may be stood on or trapped. Ifnecessary, protect it with a cable cover or other appropriate item. ........

Treat the ends of the wire carefully when installing a new charger wireto avoid electric leaks. ............................................................................

Remove toner completely from electronic components. .........................

Run wire harnesses carefully so that wires will not be trapped ordamaged. ................................................................................................


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After maintenance, always check that all the parts, screws, connectorsand wires that were removed, have been refitted correctly. Specialattention should be paid to any forgotten connector, trapped wire andmissing screws. ......................................................................................

Check that all the caution labels that should be present on the machineaccording to the instruction handbook are clean and not peeling.Replace with new ones if necessary. ......................................................

Handle greases and solvents with care by following the instructionsbelow: ..................................................................................................... Use only a small amount of solvent at a time, being careful not to

spill. Wipe spills off completely.

Ventilate the room well while using grease or solvents. Allow applied solvents to evaporate completely before refitting the

covers or turning the main switch on. Always wash hands afterwards.

Never dispose of toner or toner bottles in fire. Toner may causesparks when exposed directly to fire in a furnace, etc. .........................

Should smoke be seen coming from the copier, remove the power

plug from the wall outlet immediately. ..................................................

3. Miscellaneous

WARNING

Never attempt to heat the drum or expose it to any organic solvents

such as alcohol, other than the specified refiner; it may generate toxicgas. .........................................................................................................


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CONTENTS

GENERAL, MECHANICAL/ELECTRICAL

GENERAL

1. SAFETY INFORMATION ..............................................................G-1

2. SPECIFICATIONS ........................................................................G-5

3. PRECAUTIONS FOR INSTALLATION .........................................G-8

4. PRECAUTIONS FOR USE ...........................................................G-9

5. HANDLING OF THE CONSUMABLES ........................................G-10

6. OTHER PRECAUTIONS ..............................................................G-10

7. SYSTEM OPTIONS ......................................................................G-11

8. HIGHLIGHTS ................................................................................G-12

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

7. PC DRUM SECTION ....................................................................M-16

8. PC DRUM CHARGING SECTION................................................M-19

9. IMAGE READER (IR) SECTION ..................................................M-22

10. PRINTERHEAD (PH) SECTION...................................................M-42

11. DEVELOPING UNIT SECTION ....................................................M-49

12. TONER HOPPER SECTION ........................................................M-63

13. PAPER TAKE-UP/FEED SECTION ..............................................M-67

14. MANUAL FEED TABLE SECTION ...............................................M-81

15. SYNCHRONIZING ROLLERS SECTION .....................................M-88


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CONTENTS

16. TRANSFER DRUM SECTION......................................................M-90

17. PC DRUM CLEANING SECTION.................................................M-114

18. MAIN ERASE SECTION...............................................................M-117

19. FUSING UNIT SECTION..............................................................M-118

20. EXIT UNIT SECTION ...................................................................M-127

21. HORIZONTAL TRANSPORT UNIT SECTION ..............................M-128

22. POWER SUPPLY .........................................................................M-130

23. MEMORY BACKUP ......................................................................M-133

UNPACKING/SETTING-UP INSTRUCTIONS

DIS/REASSEMBLY, ADJUSTMENT

1. SERVICE INSTRUCTIONS ..........................................................D-1

2. DISASSEMBLY/REASSEMBLY ...................................................D-5

3. ADJUSTMENTS ...........................................................................D-97

4. MISCELLANEOUS .......................................................................D-146

SWITCHES ON PWBS, SERVICE MODE

1. PRECAUTIONS FOR HANDLING THE PWBs ............................S-1

2. CONTROL PANEL KEYS AND TOUCH PANEL ...........................S-2

3. FUNCTION OF SWITCHES AND VARIABLE RESISTORS ONPWBs ............................................................................................S-7

4. USER MODE ................................................................................S-9

5. SERVICE MODE ..........................................................................S-17

6. SECURITY MODE ........................................................................S-44

7. DEVELOPER CHANGE MODE....................................................S-46

8. TOUCH PANEL CORRECTION MODE ........................................S-49

9. DATE/TIME INPUT MODE ...........................................................S-50


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CONTENTS

TROUBLESHOOTING

1. INTRODUCTION ..........................................................................T-1

2. PAPER TRANSPORT FAILURE ...................................................T-5

3. MALFUNCTION ............................................................................T-21

4. IMAGE QUALITY PROBLEMS .....................................................T-54


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GENERAL,MECHANICAL/ELECTRICAL


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GENERAL


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CONTENTS

GENERAL

1. SAFETY INFORMATION ..............................................................G-1

2. SPECIFICATIONS ........................................................................G-5

3. PRECAUTIONS FOR INSTALLATION .........................................G-8

4. PRECAUTIONS FOR USE ...........................................................G-9

5. HANDLING OF THE CONSUMABLES ........................................G-10

6. OTHER PRECAUTIONS ..............................................................G-10

7. SYSTEM OPTIONS ......................................................................G-11

8. HIGHLIGHTS ................................................................................G-12

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-126-1. Image Stabilization System Overview ..................................M-126-2. Image Stabilization System Control ......................................M-13

7. PC DRUM SECTION ....................................................................M-167-1. Grounding of the PC Drum ...................................................M-167-2. PC Drum Drive Mechanism ..................................................M-177-3. PC Drum Temperature Control .............................................M-18

8. PC DRUM CHARGING SECTION................................................M-198-1. PC Drum Charge Corona ON/OFF Control ..........................M-198-2. PC Drum Charge Corona Wire Cleaning Mechanism ..........M-20

8-3. PC Drum Charge Section Ozone Filter .................................M-219. IMAGE READER (IR) SECTION ..................................................M-22

9-1. IR Image Processing ............................................................M-239-2. CCD Sensor.......................................................................... M-329-3. Exposure Components Section ............................................M-33


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CONTENTS

9-4. Exposure Lamp Control ........................................................M-34

9-5. Scanner and 2nd/3rd Mirrors Carriage MovementMechanism ........................................................................... M-359-6. Scanner Motor Drive Control ................................................M-369-7. IR Section Cooling Fan Motor Mechanism ...........................M-389-8. Original Size Detecting Section ............................................M-39

10. PRINTERHEAD (PH) SECTION................................................... M-4210-1. Image Processing Block Diagram ...................................... M-4310-2. Laser Exposure Process ....................................................M-45

10-3. Laser Emission Timing [SOS (Start-of-Scan) Signal] ......... M-4610-4. Laser Emission Area [HIA (horizontal scanning)

and VIA (vertical scanning) Signals] ..................................M-4710-5. LIMOS I and New Screen LIMOS ...................................... M-48

11. DEVELOPING UNIT SECTION .................................................... M-4911-1. Developing Unit Drive Mechanism ..................................... M-5111-2. Developer Flow .................................................................. M-5311-3. Developing Bias and ATDC Bias ........................................M-55

11-4. ATDC Sensor ..................................................................... M-5611-5. AIDC Sensor ...................................................................... M-5811-6. Black Toner Replenishing Control ...................................... M-5911-7. Auxiliary Toner Replenishing Mechanism .......................... M-6111-8. Toner Suction Fan Motor .................................................... M-62

12. TONER HOPPER SECTION ........................................................M-6312-1. Toner Replenishing Mechanism ......................................... M-6412-2. Toner Empty Detection Control .......................................... M-66

13. PAPER TAKE-UP/FEED SECTION ..............................................M-6713-1. Universal Tray Paper Size Detection Mechanism .............. M-6813-2. Drawer-in-Position Detection Mechanism .......................... M-7013-3. Drawer Paper Lifting/Lowering Mechanism .......................M-7113-4. Paper Empty Detection Mechanism...................................M-7313-5. 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-7613-6. Paper Dehumidifying Heaters and Humidity Sensor .......... M-7713-7. Vertical Transport Drive Mechanism .................................. M-7813-8. Paper Take-Up Control.......................................................M-79


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CONTENTS

14. MANUAL FEED TABLE SECTION ...............................................M-81

14-1. Manual Feed Paper Take-Up Mechanism .......................... M-8114-2. Manual Feed Take-Up Control ...........................................M-8214-3. Manual Take-Up Roll Pressure Mechanism .......................M-8314-4. Manual Feed Paper Separating Mechanism...................... M-8414-5. Manual Feed Paper Empty Detection Mechanism............. M-8514-6. Manual Feed Paper Width Detection Mechanism .............. M-8614-7. Manual Feed Paper Length Detection Mechanism ............M-87

15. SYNCHRONIZING ROLLERS SECTION ..................................... M-88

15-1. Synchronizing Roller Drive Mechanism ............................. M-8815-2. Synchronizing Roller Drive Control ....................................M-89

16. TRANSFER DRUM SECTION......................................................M-9016-1. Transfer Drum Drive Mechanism .......................................M-9116-2. 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-9916-4. Paper Separation Section .................................................. M-100

(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-10416-6. Oil Cleaning........................................................................ M-105(1) Oil Cleaning Backup Brush .......................................... M-106(2) Oil Roller ...................................................................... M-106(3) Oil Cleaning Control .....................................................M-107


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CONTENTS

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-11216-9. Transfer Drum Retraction Mechanism ...............................M-113

17. PC DRUM CLEANING SECTION................................................. M-11417-1. Pre-Cleaning Charge Corona.............................................M-114

17-2. PC Drum Cleaning ............................................................. M-11517-3. Ozone Exhaust from Pre-Cleaning Charge Corona

and Transfer Drum ............................................................. M-116

18. MAIN ERASE SECTION............................................................... M-117

19. FUSING UNIT SECTION.............................................................. M-11819-1. 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-12219-3. Fusing Temperature Control............................................... M-12319-4. Fusing Oil Application/Collection Mechanism ....................M-125

(1) Fusing Oil Application Drive Mechanism ..................... M-126

20. EXIT UNIT SECTION ...................................................................M-12721. HORIZONTAL TRANSPORT UNIT SECTION .............................. M-128

22. POWER SUPPLY ......................................................................... M-13022-1. Power Lines When the Power Cord is Plugged in ............. M-13022-2. Power Lines When the Power Switch is Turned ON .......... M-13122-3. Power Supplies ON/OFF Control .......................................M-13222-4. CPU Reset Function .......................................................... M-132

22-5. Power Supply Cooling Mechanism ....................................M-13223. MEMORY BACKUP ......................................................................M-133


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G-1

1 SAFETY INFORMATION

This copy machine is a digital copy machine which operates by means of a laser. Thereis no possibility of danger from the laser, provided the copy machine is operated accord-

ing to the instructions provided in this manual. Since radiation emitted by the laser iscompletely confined within protective housing, the laser beam cannot escape from themachine during any phase of user operation.

This copy machine is certified as a Class 1 laser product. This means the copy machinedoes not produce hazardous laser radiation.

LUOKAN 1 LASERLAlTEKLASS 1 LASER APPARAT

CAUTION

The use of controls, adjustments or performance of procedures other than those specifi-ed in this manual may result in hazardous radiation exposure. Because of this, Minoltastrongly recommends that you operate your copy machine only as described in thisdocumentation.

For United States Users:

Laser Safety

This copy machine is certified as a Class 1 Laser product under the U.S. Department ofHealth and Human Services (DHHS) Radiation Performance Standard according to theRadiation Control for Health and Safety Act of 1968. This means that the copy machinedoes not produce hazardous laser radiation.

CDRH Regulations

The Center for Devices and Radiological Health (CDRH) of the U.S. Food and DrugAdministration implemented regulations for laser products on August 2, 1976.Compliance is mandatory for products marketed in the United States. The label shownbelow indicates compliance with the CDRH regulations and must be attached to laserproducts marketed in the United States.

WARNING

Use of controls, adjustments or performance of procedures other than those specified inthis manual may result in hazardous radiation exposure.

Internal Laser Radiation

Maximum Radiation Power: 8 mWWave Length: 780 nm


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G-2

For Europe Users:

WARNING

Use of controls, adjustments or performance of procedures other than those specified inthis manual may result in hazardous radiation exposure.

This is a semiconductor laser. The maximum power of the laser diode is8 mW and thewavelength is 780 nm.

For Denmark Users:

ADVARSEL

Usynlig laserstrling ved bning, nr sikkerhedsafbrydere er ude af funktion.Undg udsttelse for strling.

Klasse 1 laser produkt der opfylder lEC825 sikkerheds kravene.

For Finland, Sweden Users:

VAROlTUS

Laitteen Kyttminen muulla kuin tss kyttohjeessa mainitulla tavalla saattaaaltistaa kyttjn turvallisuusluokan 1 ylittvlle nkymttmlIe lasersteiylle.

VARNING

Om apparaten anvnds p annat stt n i denna bruksanvisning specificerats, kananvndaren utsttas fr osynlig laserstrlning, som verskrider grnsen fr laser klass1.

For Norway Users:

ADVERSEL

Dersom apparatet brukes p annen mte enn spesifisert i denne bruksanvisning, kan

brukeren utsettes for unsynlig laserstrling som overskrider grensen for laser klasse 1.

Dette en halvleder laser. Maksimal effeckt till laserdiode er 8 mW og blgelengde er780 nm.


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G-3

Label inside copy machine

The following laser safety label will be attached inside the copy machine as shownbelow.

1154M085AD

CAUTION- INVISIBLE LASER RADIATION WHEN OPEN AVOIDEXPOSURE TO BEAM

VORSICHT- UNSICHTBARE LASERSTRAHLUNG WENN ABDECKUNGGEFFNET NICHT DEM STRAHLAUSSETZEN

VARO! AVATTAESSAOLET ALTTIINANKYM TTMLLELASERSTEILYLLE L KATSO STEESEEN

ADVARSEL- USYNLIG LASERSTRLING VEDBNING UNDG

UDSTTELSE FOR STRLINGVARNING- OSYNLIG LASERSTRLNING NR DENNADEL RPPNAD

STRLENR FARLIG

DANGER

Inv

isiblelaserra

diationw

henopen.

AVOID

DIRECT

EXPOSURE

TO

BEAM

0947-7

127-0

1

DANGER

Invisiblelaserradiationwhenopen.

AVOIDDIRECTEXPOSURE

TOBEAM0947-7127-01

CAUTION- INVISIBLE LASER RADIATION WHEN OPEN AVOIDEXPOSURE TO BEAM

VORSICHT- UNSICHTBARE LASERSTRAHLUNG WENN ABDECKUNGGEFFNET NICHT DEM STRAHLAUSSETZEN

VARO! AVATTAESSAOLET ALTTIINANKYM TTMLLE

LASERSTEILYLLE L KATSO STEESEENADVARSEL- USYNLIG LASERSTRLING VEDBNING UNDG

UDSTTELSE FOR STRLINGVARNING- OSYNLIG LASERSTRLNING NR DENNADEL RPPNAD

STRLENR FARLIG

CAUTION- INVISIBLE LASER RADIATION WHEN OPEN AVOID

EXPOSURE TO BEAMVORSICHT- UNSICHTBARE LASERSTRAHLUNG WENN ABDECKUNG

GEFFNET NICHT DEM STRAHLAUSSETZENVARO! AVATTAESSAOLET ALTTIINANKYM TTMLLE

LASERSTEILYLLEL KATSO STEESEEN

ADVARSEL- USYNLIG LASERSTRLING VEDBNING UNDGUDSTTELSE FOR STRLING

VARNING- OSYNLIG LASERSTRLNING NR DENNADEL R PPNADSTRLENR FARLIG

CAUTION- INVISIBLE LASER RADIATION WHEN OPEN AVOID

EXPOSURE TO BEAMVORSICHT- UNSICHTBARE LASERSTRAHLUNG WENN ABDECKUNG

GEFFNET NICHT DEM STRAHLAUSSETZENVARO! AVATTAESSAOLET ALTTIINANKYM TTMLLE

LASERSTEILYLLE L KATSO STEESEEN

ADVARSEL- USYNLIG LASERSTRLING VEDBNING UNDGUDSTTELSE FOR STRLING

VARNING- OSYNLIG LASERSTRLNING NR DENNADEL RPPNADSTRLENR FARLIG

For United StatesFor Europe

For United States

For Europe


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G-4

ALL AreasCAUTION

Danger of explosion if battery is incorrectly replaced.Replace only with the same or equivalent type

recommended by the manufacturer.Dispose of used batteries accordingto the manufacturers instructions.

Denmark onlyADVARSEL!

Lithiumbatteri - Eksplosionsfare ved fejlagtig hndteringUdskiftning m kun ske med batteri

af samme fabrikat og type.Levr det brugte batteri tilbage til leverandren.

Norway onlyADVARSEL

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

VARNINGExplosionsfara vid felaktigt batteribyte.Anvnd samma batterityp eller en ekvivalent

typ som rekommenderas av apparattillverkaren.Kassera anvnt batteri enligt fabrikantens

instruktion.

Finland onlyVAROlTUS

Paristo voi rjht, jos se on virheellisesti asennettu.

Vaihda paristo ainoastaan laitevalmistajan suosittelemaantyyppiin. Hvit Kytetty paristo valmistajan ohjeidenmukaisesti.


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G-5

2 SPECIFICATIONS

Type

Platen TypeOriginal Scanning

Resolution

Scanning DensityPrint Density

Copying System

Paper FeedingSystem

Exposure System

Developing System

Charging SystemPaper AttractionSystem

Image TransferSystem

Paper SeparatingSystem

Transfer FilmCleaning SystemPC Drum CleaningSystem

Ozone Removal

SystemFusing SystemTransfer Film ChargeNeutralizing

PC Drum

Types of Originals

Maximum Size ofOriginalCopy Paper Size

Freestanding

StationaryScanning in the main-scanning direction with a reduction-typecolor CCD (RGB 3 lines) sensor

400 dpi

400 dpi 400 dpi400 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 + attractionroller + backup mechanism)

Static image transfer system (corotron charger + backupmechanism)

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 rollersStatic charge neutralizing (corotron charger)

OPC-MLII (Organic Photoconductor)

Sheet, book, and three-dimensional objects weighing up to2 kg or 41/2 lbs.

MetricA3Inch11" 17"Multi Bypass Table: MetricA3 wide (305 mm 457 mm) to

A5R, A6 thick paperInch12" 18" to 51/2" 81/2",4" 6" thick paper

Upper/Middle/Lower Drawer: MetricA3 to A5RInch11" 17" to 51/2" 81/2"


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G-6

Copy Paper Type:

1st to 3rd Drawers

(automatic feeding)

297 432 mm

140 182 mm

Multi Bypass Table

*

*

*

305 457 mm

140 182 mm [A6thick paper

105 148 mm

(Metric)

4" 6" thick paper

102 152 mm

(Inch)]

Plain paper (64 to 90 g/m2)

Translucent paper

OHP transparencies (dedicated)

Thick paper (91 to 105 g/m2)

Thick paper (106 to 157 g/m2)

A6 thick paper (for Metric)

4" 6" thick paper (for Inch)

Recycled paper

Max. (width length mm)

Min. (width length mm)

Copypaper

Dimensions

: Reliably fed : Unreliably fed

*: Reliably fed if 20 sheets or less

Warming-up Time Approx. 9 min. at ambient temperature of 20C/68F and ratedsource voltage

Warming-up TimeAfter Energy Saver 60 sec. or lessModeFirst Copy Time (Upper Drawer, 1.000, Manual Exposure Mode)

Area Paper Size Full Color Mono Color

Inch 81/2" 11"30 sec. 14 sec.

Metric A4R

Copying Speed for Multi-Copy Cycle (Upper Drawer, 1.000) (copies/min.)

Area Paper Size Full Color Mono Color

A3

B4 3 11

Metric A4R

A46 23

A5R

11" 17"

3 11Inch

81/2" 11"

11" 81/2"6 23

51/2" 81/2"


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5BL

G-7

Multiple Copies 1 to 99 copies (count-down system)

Zoom Ratios

Full size 1.000

EnlargementInch 1.214, 1.294, 2.000

Fixed Metric 1.154, 1.224, 1.414

ReductionInch 0.647, 0.733, 0.785

Metric 0.707, 0.816, 0.866

Variable 0.250 to 6.000 (in 0.001 increments)

Leading edge: 8 mm [4" 6" thick paper (Inch), A6 thick paper(Metric); 5 mm]

Void Image Width Trailing edge: 4 mmFront/rear edge: 3 mm [4" 6" thick paper (Inch), A6 thick

paper (Metric); 5 mm]Lens Through lens (F = 5, f = 61.1 mm)

Light Source Halogen frost tube lamp

Fusing Temperature Upper/Lower Fusing Roller surface temperature: 155C/311F

Power/Current Consumption (copier with full set of options)

Exposure Lamp

(Rating)

70 V

150 W

Fusing Roller

Heater Lamp

(Rating)

120 V/220 V to 240 VUpper: 650 W

Lower: 400 W

Max. Power

Consumption

1500 W

Max. Current

Consumption

13 A/7 A

Power Requirements 120 V, 220 V to 240 V; 50 Hz/60 Hz

Environmental Conditions

Temperature

10C/68F to

30C/86F with a

fluctuation of10C/68F or less

per hour

Humidity

25 to 85% with a

fluctuation of 20%RH or less per hour

Ambient Illumination

3000 lux or less

Levelness

1

or less

Dimensions 640 (W) 765 (D) 994 (H) mm251/4" (W) 30" (D) 391/4" (H) (H: up to Original Glasssurface)640 (W) 765 (D) 1025 (H') mm251/4" (W) 30" (D) 405/16" (H') (H': up to Original Cover)

Weight 215 kg or 474 lbs.

Standard Accessories Exit Tray, Multi Bypass TableOptions Duplexing Document Feeder Color Display Editor

10 Bin Staple Sorter Large Capacity Cassette 10 Bin Sorter Printer Controller Duplex Unit Printer Controller Board Editor Board


26/541

5BL

G-8

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 blankspots 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 120 V/13 A, or 220 V to 240 V/7 A 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:

* 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?

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 underneaththe mechanism.

Grounding

To prevent receiving electrical shocks in the case of electrical leakage, always groundthe copier. Connect the grounding wire to:

* The ground terminal of the outlet.* 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.


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5BL

G-9

4 PRECAUTIONS FOR USE

To ensure that the copier is used in an optimum condition, observe the followingprecautions.

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: 10C/68F to 30C/86F with a fluctuation of 10C/68F 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: 120/230 V AC

10% (Copying performance assured)15% (Paper feeding performance assured)

Frequency Fluctuation: 50/60 Hz 0.3%


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5BL

G-10

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 fedlengthwise.

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.).

6 OTHER PRECAUTIONSThe Printerhead of this copier uses a laser diode that emits a laser beam. Use thefollowing 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 precau-

tions.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 thatis enclosed by walls.

3. Do not bring a highly reflective tool into the laser beam path during the service job.


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G-11

7 SYSTEM OPTIONS

1. Duplexing Document Feeder2. Coler Display Editor3. Editor Board4. Large Capacity Cassette5. Duplex Unit

6. 10 Bin Sorter7. 10 Bin Staple Sorter8. Printer Controller9. Printer Controller Board

8

1154U059AA

9

3

4467U008AA

1

1151O007AA

2

1144O642AA

4

1154O028AA

1144O003AB

5

1144O184AA

6, 7

1139O0020A


30/541

5BL

G-12

8 HIGHLIGHTS

The Copier is a digital full-color copier and intended for 100% customer satisfaction(CS) through the CS-color technologies that offer enhanced image quality, greater

reliability, and better operability. It 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 (Laser Intensity Modulation System) 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. (A4/11" 81/2") and 23

monochrome copies/min. (A4/11" 81/2"). 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 826 765 mm/321

/2" 30" space forinstallation. Realizes an outstanding quietness of 53.6 dB.

5. Better serviceability Easier replacement of ROMs thanks to the flash memory card.


31/541

MECHANICAL/

ELECTRICAL


32/541

M-1

5BL

Fusing Unit

Duplex

Unit

IR

PH Unit(Lower)

PH Unit(Upper)

TransferUnit

PC Unit

DevelopingUnit

Upper

Drawer

MiddleDrawer

LowerDrawer

Sorter/StapleSorter

1154M018AF

1 CROSS-SECTIONAL VIEW AND PAPER PATH

The illustration below shows where different parts of the copier are placed and howthe copy paper moves through the copier.

Each of the mechanical and electrical parts is identified and located in the relevantsection that appears later in this manual.


33/541

M-2

5BL

2 COPY PROCESS

3. Photoelectric

Conversion

4. IR Image

Processing

5. PH Image

Processing

6. Laser

Exposure

17. Cleaning

1. PC Drum

18. Main Erase

2. PC Drum

Charging

7. Developing

8. Pre-Image

Transfer Erase

12. Image

Transfer

13. Paper

Separation

Transfer Drum15. Toner Cleaning

16. ChargeNeutralizing

11. Attraction

10. Manual

Feed

20. Paper Exit 19. Fusing

14. Oil Cleaning

Upper Drawer

Middle Drawer

Lower Drawer

9. Paper

Feeding

1154M083AA


34/541

M-3

5BL

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 ChargingA single-wire PC Drum Charge Corona employing the Scorotron system deposits a nega-tive 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 theoriginal.

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 ProcessingThe electrical signal output from the Photoelectric Converter is converted to 8-bit digitalimage signals (R, G, and B). After making some corrections, the IR Image ProcessingUnit outputs video signals (C, M, Y, and Bk) to the PH Image Processing Unit. (Fordetails, see p. M-23.)

5. PH Image ProcessingThe video signals (C, M, Y, and Bk) output from the IR Image Processing Unit gothrough some corrections. Following digital-to-analog conversion, these signals are thenused for the control of the intensity level of the laser diode (LD1). (For details, seep. M-43.)

6. Laser ExposureThe laser beam emitted by the laser diode (LD1) strikes the surface of the PC Drum toform 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 EraseLight from Auxiliary Erase Lamp UN21 strikes the surface of the PC Drum to improveimage transfer efficiency and, at the same time, to neutralize negative charge on thoseareas 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 FeedingThe paper loaded in the Multi Bypass Table is fed. (For details, see p. M-81.)


35/541

M-4

5BL

11. AttractionThe 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 TransferFilm so that the paper is attracted to the film by static charge. (For details, see p. M-92.)

12. Image TransferThe Image Transfer Corona applies a DC positive corona emission to the Transfer Filmto attract the negatively charged toner on the surface of the PC Drum onto the surfaceof 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 CleaningThe Oil Roller collects fusing oil from the surface of the Transfer Film during 2-sidedcopying. (For details, see p. M-105.)

15. Toner CleaningThe Fur Brush Unit collects toner particles sticking to the surface of the Transfer Film.(For details, see p. M-108.)

16.Charge NeutralizingThe Charge Neutralizing Corona showers both sides of the Transfer Film with AC and DCoverlapped 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 EraseLight from Main Erase Lamp LA2 neutralizes any surface potential remaining on thesurface 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 andfused 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 tohelp toner be cleaned from the surfaces of the two fusing rollers.

The Oil Collecting Blade scrapes residual oil from the Lower Fusing Roller. Therecovered oil is then filtered for recycling. (For details, see p. M-120.)

20.ExitThe Paper Exit Roller is turned to feed the paper out of the copier. (For details, seep. M-127.)


36/541

M-5

5BL

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.

Scanner Drive Motor

Cleaning Unit Drive

Drive for Synchronizing Roller, StaticCharge Roller, and Fur Brush Unit

PC Drum/TransferDrum

PC DrumDrive Motor

Flywheel

Fusing Motor

Developing

Unit Drive

HopperDrive

Toner Transport Motor (Bk)

Toner Transport Motor (C, M, Y)

Developing Drive MotorToner Replenishing Motor (C)

Paper Take-UpMotor

Drive for PaperTake-Up,VerticalTransport,Multi Bypass,and HorizontalTransport

Toner Replenishing Motor (C)

Toner Replenishing Motor (M)

Toner Replenishing Motor (Y)

1154M066AD


37/541

M-6

5BL

4 OPERATING SEQUENCE

Power Switch ON

OFF Paper Dehumidifying Heater 1 to 4 H4 to H7: When Paper Dehumidifying SwitchS2 is ON.

ON

ON

ON

ON

ON

ON

ON

ON

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

Approx. 0.2 sec.

ON

ON

ON

HL

Fusing Motor M17: Energized when 140C/284F is de-tected if the temperature detected byUpper Fusing Roller Thermistor TH1is less than 140C/284F.

Developing Drive Motor M16

Developing bias (DC)

Transfer Drum Reference Position Sensor 1

PC20

Approx. 2.6 sec.OFF

Transfer DrumRetract SolenoidSL12

C

A


38/541

M-7

5BL

Approx. 0.1 sec.

Approx. 1 sec.

Approx. 1.2 sec.

Approx. 2 sec.

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.)



Transfer Drum Reference Position Sensor 1 PC20

Auxiliary Erase Lamp UN21

Pre-Cleaning Charge Corona (AC)

Main Erase Lamp LA2

Transfer Drum Retract Solenoid SL12PC Drum Drive Motor M18

Paper Take-Up Motor M15

ATDC bias

PC Drum Charge Corona output

Paper Dehumidifying Heater 1 to 4 H4 to H7

Transfer Drum Retract Solenoid SL12

Fusing Roller Heater Lamp temperature controlcompleted: Warm-up completed

Fusing Motor M17

HL

OFF

OFF

HL

OFF

OFF

OFF

ON

OFF

OFF

OFF

OFF

ON

OFF

OFF

B


39/541

M-8

5BL

Start key ON

OFF Paper Dehumidifying Heater 1 to 4 H4 to H7: When Paper Dehumidifying SwitchS2 is ON.

ON

ON

Operation A when the Power Switch is turned ON



HLTransfer Drum Reference Position Sensor 1 PC20

ONCharge Neutralizing Corona output (AC)

Approx. 1.5 sec.

OFFCharge Neutralizing Corona output (AC)

Approx. 5 sec.

ON Upper Drawer Paper Take-Up ClutchCL11

ONTransport Roller Clutch CL15

HLUpper Drawer Paper Take-Up SensorPC12

Approx. 2.3 sec.

OFF Upper Drawer Paper Take-Up ClutchCL11

HLPaper Leading Edge Detecting Sensor PC18

OFFTransport Roller Clutch CL15

Approx. 0.6 sec.

OFF

ONOFF

ONOFF

ONOFF

Approx. 2.6 sec.

(Upper Drawer feeding, single copy, full size, mono color)

Transfer Drum RetractSolenoid SL12

Exposure Lamp LA1:(See 9-4. ExposureLamp Control.)

Scanner Motor M1:(See 9-6. ScannerMotor Drive Control.)

Laser Diode:(See 10. PRINTER-HEAD (PH) SECTION)

Transfer Drum ReferencePosition Sensor 1 PC20

HL

D

Papertake-up

Expo-sure


40/541


41/541

M-10

5BL

E F

Approx. 0.2 sec.

ONPre-Cleaning Charge Corona output (DC)

ON

Separation

Paper Separator Finger Solenoid SL14


ONLifting Finger Solenoid SL16

ONPaper Separator Corona output

OFFLifting Finger Solenoid SL16

OFFPaper Separator Corona output

OFFPaper Separator Finger Solenoid SL14

ONCharge Neutralizing Corona output (AC + DC)

OFFCharge Neutralizing Corona output (AC + DC)


correction (See 6-2. Image Stabilization System Control.)

Transfer Film toner cleaning mode:(See 16-7. Toner Cleaning.)

OFFFusing Motor M17

Pre-Cleaning Charge Corona output (AC)OFF

OFFPre-Cleaning Charge Corona output (DC)

Pre-Cleaning Charge Corona output (AC)ON

Approx. 0.3 sec.

Approx. 1.4 sec.

Approx. 1.5 sec.

Approx. 5.1 sec.

Operation B when the Power Switch is turned ON


42/541

M-11

5BL

5 CONTROL BLOCK DIAGRAM

Control Panel(UN27)

Motor DriveBoard (PWB-G)

IR ImageProcessing Unit PhotoelectricConverter

IR Control Board(PWB-C)

A/D ConverterBoard (PWB-B)

CCD SensorBoard (PWB-A)

PH Control Board(Digital) (PWB-JD)

PH Image Processing Unit

PH Control Board(Analog) (PWB-JA)

SOS Board(PWB-S)

Laser Diode (LD1)

Power SupplyBoard (PWB-L)

Master Board(PWB-I)

Fusing Unit

Transfer Drum

Paper Take-Up Board(PWB-K) PC Drum

Control Signal

Image Signal

PH

IR

Paper Source


43/541

M-12

5BL

6 IMAGE STABILIZATION SYSTEM

6-1. Image Stabilization System Overview

Purpose Means Control (Sensor)

To stabilize * correction control AIDC Sensor UN20image density AIDC Sensor contamination correction Surface Potential

To stabilize AIDC detection Detection Sensorgradation PC Drum surface potential detection UN22

Max. LD1 intensity calculation PC Drum Life Counter Operations (setting VG and VB) Humidity Sensor UN23

To stabilize the * ATDC control (C, M, Y) ATDC Sensors UN33,amount of toner 34, 35

attracted To stabilize the * Black toner replenishment control Developer Life Counter

amount of toner AIDC Sensor UN20attracted Humidity Sensor UN23

To stabilize PC * PC Drum temperature control PC Drum HeaterDrum sensitivity Control Board PWB-W

To stabilize * Static Charge, Image Transfer, Paper Humidity Sensor UN23paper attraction, Separator, and Charge Neutralizingimage transfer, Corona output controlpaper separa-

tion, and chargeneutralization

* An explanation is given of each control other than correction control in the relevantsection that follows the current one.

ChargeNeutralizingTransformer

StaticChargeCorona

HumiditySensor

Image

TransferTransformer

Paper SeparatorCorona

ChargeNeutralizingCorona

Image TransferCorona

AIDCSensor

Image Transfer,Paper Separation,ChargeNeutralizing

ATDC Control

Black TonerReplenishingControl

DeveloperLifeCounter

ATDC Sensor

PC Drum HeaterControl Board

PC DrumHeater ControlSystem

PC DrumHeater

PC Drum Charge Corona

LD1

DevelopingBiasTransformer

Correction Control

Fur Brush

PaperSeparatorTransformer

Fur BrushBiasTransformer

Static ChargeTransformer

Developing Bias

LD1 Driver

V0 Sensor

PC Drum

ChargeTransformer

TonerReplenishingMotor

1144M020AA


44/541

M-13

5BL

VB

ID (Image Density)

PC Drum

Surface

Potential

Laser Light Intensity

Image

Input

Data

ReversalDevelopingCharacteristics

PC Drum LightDecay Curve

Laser RadiationCharacteristics

Image Density

Characteristics

curve

=1

Drum charging/image transfercharacteristics

Developing characteristics

Grid voltage (VG) Developing bias Exposure curve Maximum intensity of LD1 light

Start Key ON Power SwitchS1 ON Misfeed or malfunctionreset

Copy cycle executed(1)

Is the copy cycle completed?

(2), (3)

AIDC detection PC Drum surface potential

detection (Vi detection)

(5)

Operations

End

Image Adjust ofService Mode

Background Voltage

PRT Hilight

PRT Max Density

AIDC Sensor UN20fine adjustment

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

Operation Flow

1144M161CA


45/541

M-14

5BL

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 theamount 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 OffsetAdjustment. (See the chart below.)

D. Requirements of the amount of toner attracted (a, b and c) for AIDC detection areplotted on the chart.

E. Of density patterns 1 through 5, the ones that are closest to a, b and c, respectivelyare selected.

F. The three density patterns selected are used in AIDC detection.

* These operations are performed while the PC Drum turns one complete turn.

(V)

(mg/cm )2

a b c

1

2

3

4

5

UN20Output

Amount of Toner Attracted

Background Level

Solid Pattern

1144M162CA


46/541

M-15

5BL

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, andBk) 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 malfunctionis 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 pro-duced 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) iscorrected at a timing between copies.

PMAX Correction OperationA. 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 settingthe parameters, the CPU maintains the best possible image quality.

The values set for PRT Max Density, PRT Hilight, and Background Voltage ofImage Adjust available from the Service Mode are incorporated during theseoperations.


47/541

M-16

5BL

Aluminum Cylinder

100 350 mm

PC Drum

1074M017

1076M043

CTLCGL

Handling PrecautionThe PC Drum exhibits light fatigue after being exposed to light for a long time, whichresults in its sensitivity being changed. Therefore, always wrap the drum in the PCDrum Cloth or a soft cloth immediately after it has been removed from the copier.

7-1. Grounding of the PC Drum

The potential on the surface of the PC Drum exposed to the laser beam is groundedthrough the Ground Plate which is in contact with the drum shaft.

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 onan aluminum alloy base. The outer of the two layers is called the Charge TransportLayer (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 = 100 350 mm

PC Drum1154M024AC

Flywheel

Ground Plate

Drum Shaft

M18


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PC Drum1154M024AC

Flywheel

Ground Plate

Drum Shaft

M18

Start Key ON

PC20

Paper Take-UpMotor (M15)

M18

ONOFF

ONOFF

HL

Approx. 0.4 sec.

Approx. 2.3 sec.

1154T21MCB

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.

Control Signal Energized Deenergized Wiring Diagram

M18

PWB-I PJ8I-3B H H

14-GPWB-I PJ8I-4B L H

Control Signal Blocked Unblocked Wiring Diagram

Transfer DrumReference Posi- PWB-I PJ4I-5B L H 15-Etion Sensor PC20

Timing Chart


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7-3. PC Drum Temperature Control

PC Drum Heater H3 is installed inside the PC Drum to maintain drum sensitivity andprevent 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 5C/95 9F. H3 is a 50 W heater. Power to H3 is supplied through the electrodes on the front flange face.

Assuming that there is a temperature difference of 2C/3.6F between the outside and

inside of the PC Drum, the reed switch is turned OFF when the temperature reaches37C/98.6F and ON when it becomes lower than 33C/91.4F.

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

OFF

ON

OFF

H3

(C/F)

35/95

0/32

Temperature-

SensitiveReed Switch

PC Drum

SurfaceTemperature

Time

Temperature-SensitiveReed Switch

1144M09TCB

1144M025AA

Electrodes

Front Flange

H3

PC Drum


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8-1. PC Drum Charge Corona ON/OFF Control


High Voltage Unit 1HV1 (PC Drum PWB-I PJ11I-9 L H 15-ICharge Corona)

Control Signal Blocked Unblocked Wiring Diagram

Transfer DrumReference Position PWB-I PJ4I-5B L H 15-E

Sensor PC20

1144M10TCC

1144M026AA

Grid Mesh

Constant-VoltageCircuit

PC Drum

Corona Wire

HV1

PC Drum Drive

Motor (M18)

HV1

PC20

ON

OFF

ON

OFF

HL

Start Key ON

End of Copy Cycle

8 PC DRUM CHARGING SECTION

The PC Drum Charge Corona has a Scorotron grid to deposit a negative DC chargeevenly across the surface of the PC Drum.

The grid voltage (VG) applied to the grid mesh is kept in the range between 400 and1100 V by the Constant-Voltage Circuit in High Voltage Unit 1 HV1. The constantvoltage of HV1 is determined through image stabilization control.


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8-3. PC Drum Charge Section Ozone Filter

Ozone produced by the PC Drum Charge Corona is absorbed by the Ozone Filterfrom the air blown against the back of the PC Drum Charge Corona by OzoneVentilation Fan Motor M5.

1144M12TCA

ONOFF

Power OFFS1 ON

M5


M5 PWB-I PJ3I-6B L H 15-D

PC Drum Charge Corona M5

1154M093AA

Ozone Filter


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9 IMAGE READER (IR) SECTION

1. DC Power Supply 2 PU2 13. Scanner Home Position Sensor PC12. Original Glass Cooling Fan Motor M2 14. Cable Pulley3. Original Cover Angle Detecting Sensor 15. Cable

PC22 16. IR Control Board PWB-C4. Actuator 17. A/D Converter Board PWB-B

5. Motor Drive Board PWB-G 18. CCD Sensor Board PWB-A6. Scanner Motor M1 19. Exposure Lamp LA17. Original Size Detecting Sensor 3 SE3 20. Scanner8. Original Size Detecting Sensor 4 SE4 21. 2nd/3rd Mirror9. IR Section Thermostat TS3 22. Size Reset Switch S12

10. IR Cooling Fan Motor 1 M24 23. Original Size Detecting Sensor 1 SE111. CCD Sensor 24. Original Size Detecting Sensor 2 SE212. IR Cooling Fan Motor 2 M25

1

2

24 23 2221

20 19

1817

16

15

14

1312

11109

87

65

43

1154M019AC


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9-1. IR Image Processing

10. Color Correction (Reflection/Density

Conversion, Masking, UCR/BP)

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

8. AE Processing

Interface

11. Miscellaneous Processing (Improved Reproduction of Black Characters,

Edge Emphasis, 3 3 Crossing on Edges, Smoothing, Color Balance,

Gamma () Correction)

To Printer Head (PH)

9. Image Area Discrimination


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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 twochannels, one for even-numbered pixels and the other for odd-numberedpixels.

2 Analog-to-Digital Conversion: PWB-B

The odd and even analog signals output from the CCD Sensor chips aresynthesized to form a single string of signal data which is in turn converted to8-bit digital signals.

3 Shading Correction: PWB-C

An error is corrected that occurs due to variations in sensitivity of each CCD chipand 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 thecorrection value for each pixel.

3. When the image is scanned, each pixel data is corrected with the abovecorrection value.

To prevent adverse effects on the image due to dust on the shading sheet, themaximum value of the readings taken in the sub-scanning direction of theshading 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 of4 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. (Theslower the scanning speed, the greater the amount of deviation.)

A memory called FIFO* is used to compensate for this deviation. It retards theoutput timing for R and G data to match it with that for B data.

* FIFO (first-in-first-out): Data is output in the same order as it is input.

R data FIFO FIFO Output

G data FIFO Output

B data Output


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6 Histogram Making: PWB-C ACS: Auto Color Selection

The scanning area is divided into 256 blocks [512 (main-scanning) 512 (sub-scanning) 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 (256blocks). [This generates a lightness histogram for AE processing. See 8. AEProcessing.]

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 Block Configuration

*a (16 blocks) b (16 blocks) = Scanning area (256 blocks)

Histogram

7 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 imagesynthesis processing.

1154M078AA

Edge

Edge

Edge

Edge

Original

b

a

1154M076AA

512 dots

512 dots

4 dots each

4 dotseach

1154M084AA

Frequency

Monochrome

Colored

Low HighSaturation

FrequencyMonochrome

Colored

Dark LightLightness1154M077AA


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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)].

* The area is not divided if, depending on the size of the original, the divisionpoint 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 theimage data sampled through Histogram Making.

The lightness data readings tallied up for each four gradation levels and in twoparts 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 ineach block) is extracted.

Calculation is made to determine if there is any gradation level extracted, thesum of frequency of 8 gradation levels of which accounts for 12.5% or moreof the sum of frequency of the entire original. (Processing is done in the orderof the gradation level of higher lightness.)

If there is, AE level (local minimum value) is set at the lightness level which is1/16 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 Feeding Direction

Lightness histogram

If a foggy background is produced despite the AE processing, further adjust-ments can be made with AE Adjust of Image Adjust available from theService Mode menu.

Edge Division point Edge

Edge

Leading edgeor original

Trailing edgeor original

CD(CrosswiseDirection)

FD (Feeding Direction)

Edge

Original

216 mm

1154M080AB

1154M079AA

4 gradationlevels

Frequency

Monochrome

Color

Low HighLightness

Local maximum value[AE level setting according to original mode]

Original mode AE level

Map 224Photo 240

Text 104 240Text/photo 136 240


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MaskingConsidering the spectral transmission characteristics of the R, G, and B filters ofthe CCD Sensor and the spectral reflection characteristics of the toner, theimage data is corrected and the DR, DG, and DB data are replaced with C, M,

and Y data, thereby enabling color reproduction faithful to the original.

UCR and BP In UCR, or Under Color Removal, the C, M, and Y data required for color

reproduction areas are retained, while the C, M, and Y data of gray areas areremoved.

With BP, or Black Paint, a certain ratio of the gray area is replaced with K data,the ratio varying depending on the saturation of the color.

Because of the spectral reflection characteristics of the toner, simply placing C,M, and Y toner one on top of the other does not make a pure black.

1154M086AA

C

M

Y

C

MY

Bk

255

0

255

0

UCR


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9-3. Exposure Components Section

1. Exposure Lamp LA1 Exposure Lamp LA1 uses a DC power supply to emit an even amount of light. It is a halogen frost lamp that works in combination with the Edge Reflectors to ensure

uniform light distribution.2. Main and Auxiliary Reflectors The Main and Auxiliary Reflectors are laid out to correct any deviation in condensing

of the LA1 light that may result from LA1 positioned eccentrically or improperly. The illumination distribution in the sub-scanning direction on the surface of the original

is made flat over a 1 mm width with reference to the G chip.3. IR Section Thermostat TS3 This thermostat forces the circuit to be shut down as soon as it detects

120 5C or more as a result of LA1 turning ON abnormally.

B G R

1144M013AA

1st Mirror

Main Reflector

Edge Reflector

0.25 mm 0.25 mm

2nd Mirror

3rd Mirror

Auxiliary Reflector


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9-4. Exposure Lamp Control

Exposure Lamp LA1 is turned ON and OFF by the Scan Start Timing signal (PRE-TRIG) and Image Request signal (I-REQ) from Master Board PWB-I and the Lamp ONsignal (LMPON) and Sub-Scanning Area signal (VD) from IR Control Board PWB-C.

Control Signal Wiring Diagram

PRE-TRIG (PWB-I FC1 I-30B) 16-G

I-REQ (PWB-I FC1 I-30A) 16-GLA1

LMPON (PWB-C PJ15C-3) 26-B

VD __________

When Power Switch S1 is turned ON, a misfeed or malfunction is reset, or the Door is

opened and closed:

1. Automatically adjusts the CCD Sensor output voltage clamp value for black level.2. Automatically adjusts the intensity of the exposure lamp.3. Automatically adjusts the CCD Sensor output voltage gain for R, G, and B.4. Makes a shading correction.

Scanner Drive

Motor (M1)

Scan

Stop

Return

LA1 ON

OFF

S1 ON or

CPU reset

Under the Shading Sheet

1 2 3 41154T41MCB


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Full Color, Manual Mode, Full Size:

9-5. Scanner and 2nd/3rd Mirrors Carriage Movement Mechanism

The Scanner is stationary under the shading sheet on the right-hand side whenever

Power Switch S1 is turned ON, a misfeed or malfunction is reset, or the Front Door isopened and closed.

When the Start Key is pressed, it moves to the scan start position on the left-handside while making a shading correction.

The Scanner projects an even amount of Exposure Lamp LA1 light, as it moves, ontothe entire surface of the original and reflects this light, with the 1st Mirror, onto the 2ndand 3rd Mirrors.

It is driven by Scanner Drive Motor M1 with the Scanner Drive Cables attached to thefront and rear.

The light reflected off the 1st Mirror is directed to the Lens through the 2nd and 3rdMirrors. It then strikes CCD Sensor Board PWB-A. Drive for the 2nd/3rd Mirrors Carriage comes from M1 via two cables. The carriage

moves at a speed half that of the Scanner.

0.5 sec.

B

A

0.5 sec. 0.5 sec. 0.5 sec. 0.5 sec.

A A A

A: Varies for different paper sizes and zoom ratios.

B: Shading correction

H

L

H

L

H

L

H

L

ON

OFF

Image Request Signal

(I-REQ)

Scan Start Timing Signal

(PRE-TRIG)

Lamp ON Signal

(LMPON)

Exposure Lamp

(LA1)

Sub-Scanning Area Signal

(VD)

Start Key ON1st Scan 2nd Scan 3rd Scan 4th Scan

1154T42MCA


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9-6. Scanner Motor Drive Control

Scanner Drive Motor M1, a stepping motor, is controlled by Master Board PWB-I, IRControl Board PWB-C, and Motor Drive Board PWB-G.

Scan Enable Signal

(SCAN-ENABLE)

The direction of M1 rotation is

switched from forward to

backward, or vice versa, by

changing the output sequence

of pulses 1 to 5.

1 2 3 4 5

M1

PJ2G

PWB-GPJ3G

PJ2C

The M1 drive pulse is timed

with the reference clock.

Reference Clock

M1 Drive Pulse (PJ2C)

PWB-CPJ5C

FC1

PWB-JDFC3

FC1 I-30A

LL

L

Image Request Signal (I-REQ)

Transfer Drum Reference Position

Detecting Signal (T-BASE)

PWB-I


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9-8. Original Size Detecting Section

1. Original Size Detecting Sensors A multibeam sensor is used for the Original Size Detecting Sensors (SE1 to SE4). A multibeam sensor consists of a light emitter and a photosensor.

The light emitter employs an optical device called the grating that diffracts the lightemitted by the LED (infrared) into three beams.

If no grating is used, only one light beam is emitted. Three photodiodes, used as the photosensor, detect an original.

(Original present: L; original not present: H).

Sensor TypesThere are three types of sensors according to the number of beams and the distancesof detection and non-detection from the sensor top surface.[For the layout of each sensor, see 3. Determining Original Size that follows.]

SE1 SE2 SE3 SE4No. of Beams 1 3

Detection Distance 80 mm 50 mm

Non-Detection Distance 120 mm 80 mm

Photoreceiver Lens

SE1 to SE4

Grating

Photodiodes

Projection Lens

1144M014AA

LED

Original


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Inch Areas

SE3

A B C

51/2" 81/2" 81/2" 11" 81/2" 14"G 81/2" 51/2" 11" 81/2" 81/2" 11" 81/2" 14"

H 11" 81/2" 11" 81/2" 11" 17" 11" 17"

I 11" 81/2" 11" 81/2" 11" 17" 11" 17"

SE3 SE4

A B C D E F

51/2" B5R A4R A4R FLS

81/2" 81/2" 14"

G 81/2" 11" 81/2" A4R A4R FLS 8

1/2" 51/2" 81/2" 11" 14"

H B5 11" B4 B4 B4 B4 B481/2"

I A4 11" 11" 17" 11" 17" 11" 17" 11" 17" 11" 17

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