Minolta mc7300 Service Manual

17500XX-001

1750061-001A

Trademarks

The following are registered trademarks of MINOLTA-QMS, Inc.: QMS and the MINOLTA-QMS logo. Minolta, and PagePro are trademarks of Minolta Co., Ltd. Other product names mentioned in this guide may also be trademarks or registered trademarks of their respective owners.

Proprietary Statement

The digitally encoded software included with your printer is Copyrighted © 2002 by MINOLTA-QMS, Inc. All Rights Reserved. This software may not be reproduced, modified, displayed, transferred, or copied in any form or in any manner or on any media, in whole or in part, without the express written permission of MINOLTA-QMS, Inc.

This manual is Copyrighted © 2003 by MINOLTA-QMS, Inc., One Magnum Pass, Mobile, AL 36618. All Rights Reserved. This document may not be copied, in whole or part, nor transferred to any other media or language, without written permission of MINOLTA-QMS, Inc.

Manual Notice

MINOLTA-QMS, Inc. reserves the right to make changes to this manual and to the equip-

ment described herein without notice. Considerable effort has been made to ensure that this manual is free of inaccuracies and omissions. However, Inc. makes no warranty of any kind including, but not limited to, any implied warranties of merchantability and fitness for a particular purpose with regard to this manual. tained in this manual or for incidental, special, or consequential damages arising out of the furnishing of this manual, or the use of this manual in operating the equipment, or in connection with the performance of the equipment when so operated.

MINOLTA-QMS, Inc. assumes no responsibility for, or liability for, errors con-

MINOLTA-QMS,

1. SAFETY PRECAUTIONS FOR INSPECTION AND SERVICE

• When performing inspection and service procedures, observe the following precautions

to prevent accidents and ensure utmost safety.

✽ Depending on the model, some of the precautions given in the following do not apply.

• Different markings are used to denote specific meanings as detailed below.

WARNING

• Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

CAUTION

• Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury. It may also be used to alert against unsafe practices.

• The following graphic symbols are used to give instructions that need to be observed.

Used to call the service technician attention to what is graphically represented inside the marking (including a warning).

Used to prohibit the service technician from doing what is graphically represented inside the marking.

Used to instruct the service technician to do what is graphically represented inside the marking.

1-1. Warning

1. Always observe precautions.

• Parts requiring special attention in this product will include a label containing the mark shown on the left plus precautionary notes. Be sure to observe the precautions.

• Be sure to observe the “Safety Information” given in the Operator’s Manual.

WARNING

2. Before starting the procedures, be sure to unplug the power cord.

• This product contains a high-voltage unit and a circuit with a large current capacity that may cause an electric shock or burn.

• The product also contains parts that can jerk suddenly and cause injury.

• If this product uses a laser, laser beam leakage may cause eye damage or blindness.

3. Do not throw toner or the toner bottle into a fire.

• Do not throw toner or the Toner Bottle (Imaging Cartridge, Toner Cartridge) into a fire. Toner expelled from the fire may cause burns.

4. Use the specified parts.

• For replacement parts, always use the genuine parts specified in the manufacturer’s parts manual. Installing a wrong or unauthorized part could cause dielectric breakdown, overload, or undermine safety devices resulting in possible electric shock or fire.

• Replace a blown electrical fuse or thermal fuse with its corresponding genuine part specified in the manufacturer’s parts manual. Installing a fuse of a different make or rating could lead to a possible fire. If a thermal fuse blows frequently, the temperature control system may have a problem and action must be taken to eliminate the cause of the problem.

5. Handle the power cord with care and never use a multiple outlet.

• Do not break, crush or otherwise damage the power cord. Placing a heavy object on the power cord, or pulling or bending it may damage it, resulting in a possible fire or electric shock.

• Do not use a multiple outlet to which any other appliance or machine is connected.

• Be sure the power outlet meets or exceeds the specified capacity.

• Use only the power cord supplied in the package. If a power cord is not supplied, only use the power cord and plug that is specified in POWER CORD INSTRUCTION. Failure to use this cord could result in a fire or electrical shock.

• Use the power cord supplied in the package only for this machine and NEVER use it for any other product. Failure to observe this precaution could result in a fire or electrical shock.

6. Be careful with the high-voltage parts.

• A part marked with the symbol shown on the left carries a high voltage. Touching it could result in an electric shock or burn. Be sure to unplug the power cord before servicing this part or the parts near it.

7. Do not work with wet hands.

• Do not unplug or plug in the power cord, or perform any kind of service or inspection with wet hands. Doing so could result in an electric shock.

WARNING

8. Do not touch a high-temperature part.

• A part marked with the symbol shown on the left and other parts such as the exposure lamp and fusing roller can be very hot while the machine is energized. Touching them may result in a burn.

• Wait until these parts have cooled down before replacing them or any surrounding parts.

9. Maintain a grounded connection at all times.

• Connect the power cord to an electrical outlet that is equipped with a grounding terminal.

10. Do not remodel the product.

• Modifying this product in a manner not authorized by the manufacturer may result in a fire or electric shock. If this product uses a laser, laser beam leakage may cause eye damage or blindness.

11. Restore all parts and harnesses to their original positions.

• To promote safety and prevent product damage, make sure the harnesses are returned to their original positions and properly secured in their clamps and saddles in order to avoid hot parts, high-voltage parts, sharp edges, or being crushed.

• To promote safety, make sure that all tubing and other insulating materials are returned to their original positions. Make sure that floating components mounted on the circuit boards are at their correct distance and position off the boards.

1-2. Caution

1. Precautions for Service Jobs.

• A star washer and spring washer, if used originally, must be reinstalled. Omitting them may result in contact failure which could cause an electric shock or fire.

• When reassembling parts, make sure that the correct screws (size, type) are used in the correct places. Using the wrong screw could lead to stripped threads, poorly secured parts, poor insulating or grounding, and result in a malfunction, electric shock or injury.

• Take great care to avoid personal injury from possible burrs and sharp edges on the parts, frames and chassis of the product.

• When moving the product or removing an option, use care not to injure your back or allow your hands to be caught in mechanisms.

CAUTION

2. Precautions for Servicing with Covers and Parts Removed.

• Wherever feasible, keep all parts and covers mounted when energizing the product.

• If energizing the product with a cover removed is absolutely unavoidable, do not touch any exposed live parts and use care not to allow your clothing to be caught in the moving parts. Never leave a product in this condition unattended.

• Never place disassembled parts or a container of liquid on the product. Parts falling into, or the liquid spilling inside, the mechanism could result in an electric shock or fire.

• Never use a flammable spray near the product. This could result in a fire.

• Make sure the power cord is unplugged before removing or installing circuit boards or plugging in or unplugging connectors.

• Always use the interlock switch actuating jig to actuate an interlock switch when a cover is opened or removed. The use of folded paper or some other object may damage the interlock switch mechanism, possibly resulting in an electric shock, injury or blindness.

3. Precautions for the Working Environment.

• The product must be placed on a flat, level surface that is stable and secure.

• Never place this product or its parts on an unsteady or tilting workbench when servicing.

• Provide good ventilation at regular intervals if a service job must be done in a confined space for a long period of time.

• Avoid dusty locations and places exposed to oil or steam.

• Avoid working positions that may block the ventilation ports of the product.

4. Precautions for Handling Batteries. (Lithium, Nickel-Cadmium, etc.)

• Replace a rundown battery with the same type as specified in the manufacturer’s parts manual.

• Before installing a new battery, make sure of the correct polarity of the installation or the battery could burst.

• Dispose of used batteries according to the local regulations. Never dispose of them at the user’s premises or attempt to try to discharge one.

5. Precautions for the Laser Beam. (Only for Products Employing a Laser)

• Removing the cover marked with the caution label could lead to possible exposure to the laser beam, resulting in eye damage or blindness. Be sure to unplug the power cord before removing this cover.

• If removing this cover while the power is ON is unavoidable, be sure to wear protective laser goggles that meet specifications.

• Make sure that no one enters the room when the machine is in this condition.

• When handling the laser unit, observe the “Precautions for Handling Laser Equipment.”

6. Precautions for storing the toner or imaging cartridge.

• Be sure to keep the toner or imaging cartridge out of the reach of children. Licking the imaging cartridge or ingesting its contents is harmful to your health.

1-3. Used Batteries Precautions

ALL Areas

Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type recommended by the manufacturer. Dispose of used batteries according to the manufacturer’s instructions.

Germany

Explosionsgefahr bei unsachgemäßem Austausch der Batterie. Ersatz nur durch denselben oder einen vom Hersteller empfohlenen gleichwertigen Typ. Entsorgung gebrauchter Batterien nach Angaben des Herstellers.

France

Il y a danger d’explosion s’il y a remplacement incorrect de la batterie. Remplacer uniquement avec une batterie du même type ou d’un type équivalent recommandé par le constructeur. Mettre au rebut les batteries usagées conformément aux instructions du fabricant.

Denmark

Lithiumbatteri - Eksplosionsfare ved fejlagtig håndtering. Udskiftning må kun ske med batteri af samme fabrikat og type. Levér det brugte batteri tilbage til leverandøren.

Finland, Sweden

Paristo voi räjähtää, jos se on virheellisesti asennettu. Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiin. Hävitä käytetty paristo valmistajan ohjeiden mukaisesti.

CAUTION

VORSICHT!

ATT ENTI ON

ADVARSEL!

VAR OlTU S

Explosionsfara vid felaktigt batteribyte. Använd samma batterityp eller en ekvivalent typ som rekommenderas av apparattillverkaren. Kassera använt batteri enligt fabrikantens instruktion.

Norway

Eksplosjonsfare ved feilaktig skifte av batteri. Benytt samme batteritype eller en tilsvarende type anbefalt av apparatfabrikanten. Brukte batterier kasseres i henhold til fabrikantens instruksjoner.

VARNING

ADVARSEL

1-4. Other Precautions

• When handling circuit boards, observe the “HANDLING of PWBs”.

• The PC Drum is a very delicate component. Observe the precautions given in “HANDLING OF THE PC DRUM” because mishandling may result in serious image problems.

• Note that replacement of a circuit board may call for readjustments or resetting of particular items, or software installation.

1-5. Precautions for Service

• When performing inspection and service procedures, observe the following precautions to prevent mishandling of the machine and its parts.

✽ Depending on the model, some of the precautions given in the following do not apply.

1. Precautions Before Service

• When the user is using a word processor or personal computer from a wall outlet of the same line, take necessary steps to prevent the circuit breaker from opening due to overloads.

• Never disturb the LAN by breaking or making a network connection, altering termination, installing or removing networking hardware or software, or shutting down networked devices without the knowledge and express permission of the network administrator or the shop supervisor.

2. How to Use this Book

DIS/REASSEMBLY, ADJUSTMENT

• To reassemble the product, reverse the order of disassembly unless otherwise specified.

TROUBLESHOOTING

• If a component on a PWB or any other functional unit including a motor is defective, the text only instructs you to replace the whole PWB or functional unit and does not give troubleshooting procedures applicable within the defective unit.

• All troubleshooting procedures contained herein assume that there are no breaks in the harnesses and cords and all connectors are plugged into the right positions.

• The procedures preclude possible malfunctions due to noise and other external causes.

3. Precautions for Service

• Keep all disassembled parts in good order and keep tools under control so that none will be lost or damaged.

• After completing a service job, perform a safety check. Make sure that all parts, wiring and screws are returned to their original positions.

• Do not pull out the toner hopper while the toner bottle is turning. This could result in a damaged motor or locking mechanism.

• If the product is to be run with the front door open, make sure that the toner hopper is in the locked position.

• Do not use an air gun or vacuum cleaner for cleaning the ATDC Sensor and other sensors, as they can cause electrostatic destruction. Use a blower brush and cloth. If a unit containing these sensors is to be cleaned, first remove the sensors from the unit.

4. Precautions for Dis/Reassembly

• Be sure to unplug the printer from the outlet before attempting to service the printer.

• The basic rule is not to operate the printer anytime during disassembly. If it is absolutely necessary to run the printer with its covers removed, use care not to allow your clothing to be caught in revolving parts such as the timing belt and gears.

• Before attempting to replace parts and unplug connectors, make sure that the power cord of the printer has been unplugged from the wall outlet.

• Be sure to use the Interlock Switch Actuating Jig whenever it is necessary to actuate the Interlock Switch with the covers left open or removed.

• While the product is energized, do not unplug or plug connectors into the circuit boards or harnesses.

• Never use flammable sprays near the printer.

• A used battery should be disposed of according to the local regulations and never be discarded casually or left unattended at the user’s premises.

• When reassembling parts, make sure that the correct screws (size, type) and toothed washer are used in the correct places.

5. Precautions for Circuit Inspection

• Never create a closed circuit across connector pins except those specified in the text and on the printed circuit.

• When creating a closed circuit and measuring a voltage across connector pins specified in the text, be sure to use the GND wire.

6. Handling of PWBs

During Transportation/Storage

• During transportation or when in storage, new P.W. Boards must not be indiscriminately removed from their protective conductive bags.

• Do not store or place P.W. Boards in a location exposed to direct sunlight and high temperature.

• When it becomes absolutely necessary to remove a Board from its conductive bag or case, always place it on its conductive mat in an area as free as possible from static electricity.

• Do not touch the pins of the ICs with your bare hands.

• Protect the PWBs from any external force so that they are not bent or damaged.

During Inspection/Replacement

• Avoid checking the IC directly with a multimeter; use connectors on the Board.

• Never create a closed circuit across IC pins with a metal tool.

• Before unplugging connectors from the P.W. Boards, make sure that the power cord has been unplugged from the outlet.

• When removing a Board from its conductive bag or conductive case, do not touch the pins of the ICs or the printed pattern. Place it in position by holding only the edges of the Board.

• When touching the PWB, wear a wrist strap and connect its cord to a securely grounded place whenever possible. If you cannot wear a wrist strap, touch a metal part to discharge static electricity before touching the PWB.

• Note that replacement of a PWB may call for readjustments or resetting of particular items.

7. Handling of Other Parts

• The magnet roller generates a strong magnetic field. Do not bring it near a watch, floppy disk, magnetic card, or CRT tube.

8. Handling of the PC Drum

✽ Only for Products Not Employing an Imaging Cartridge.

During Transportation/Storage

• Use the specified carton whenever moving or storing the PC Drum.

• The storage temperature is in the range between –20°C and +40°C.

• In summer, avoid leaving the PC Drum in a car for a long time.

Handling

• Ensure that the correct PC Drum is used.

• Whenever the PC Drum has been removed from the printer, store it in its carton or protect it with a Drum Cloth.

• The PC Drum exhibits greatest light fatigue after being exposed to strong light over an extended period of time. Never, therefore, expose it to direct sunlight.

• Use care not to contaminate the surface of the PC Drum with oil-base solvent, fingerprints, and other foreign matter.

• Do not scratch the surface of the PC Drum.

• Do not apply chemicals to the surface of the PC Drum.

• Do not attempt to wipe clean the surface of the PC Drum.

If, however, the surface is contaminated with fingerprints, clean it using the following procedure.

A. Place the PC Drum into one half of its carton.

C4134S024AA

C4134S025AA

B. Gently wipe the residual toner off the surface of the

PC Drum with a dry, Dust-Free Cotton Pad.

• Turn the PC Drum so that the area of its surface on which the line of toner left by the Cleaning Blade is present is facing straight up. Wipe the surface in one continuous movement from the rear edge of the PC Drum to the front edge and off the surface of the PC Drum.

• Turn the PC Drum slightly and wipe the newly exposed surface area with a CLEAN face of the Dust-Free Cotton Pad. Repeat this procedure until the entire surface of the PC Drum has been thoroughly cleaned.

✽ At this time, always use a CLEAN face of the dry

Dust-Free Cotton Pad until no toner is evident on the face of the Pad after wiping.

C. Soak a small amount of either ethyl alcohol or iso-

propyl alcohol into a clean, unused Dust-Free Cotton Pad which has been folded over into quarters. Now, wipe the surface of the PC Drum in one continuous movement from its rear edge to its front edge and off its surface one to two times.

✽ Never move the Pad back and forth.

C4134S026AA

D. Using the SAME face of the Pad, repeat the proce-

dure explained in the latter half of step 3 until the entire surface of the PC Drum has been wiped. Always OVERLAP the areas when wiping. Two complete turns of the PC Drum would be appropriate for cleaning.

C4134S027AA

NOTES

• Even when the PC Drum is only locally dirtied, wipe the entire surface.

• Do not expose the PC Drum to direct sunlight. Clean it as quickly as possible even under interior illumination.

• If dirt remains after cleaning, repeat the entire procedure from the beginning one more time.

9. Handling of the Imaging Cartridge and Print Unit

✽ Only for Products Employing an Imaging Cartridge and Print Unit.

During Transportation/Storage

• The storage temperature is in the range between –20 °C and +40 °C.

• In summer, avoid leaving the Imaging Cartridge and Print Unit in a car for a long time.

Handling

• Store the Imaging Cartridge and Print Unit in a place that is not exposed to direct sunlight.

Precautionary Information on the PC Drum Inside the Imaging Cartridge and Print Unit

• Use care not to contaminate the surface of the PC Drum with oil-base solvent, fingerprints, and other foreign matter.

• Do not scratch the surface of the PC Drum.

• Do not attempt to wipe clean the surface of the PC Drum.

1-6. Safety information

(1) Laser Safety

• This is a digital machine certified as a class 1 laser product. There is no possibility of danger from a laser, provided the machine is serviced according to the instruction in this manual.

(2) Internal Laser Radiation

semiconductor laser

Maximum power of the laser diode 15 mW

Maximum average radiation power(*) 7.351 µW

Wavelength 770-800 nm

*:at laser aperture of the Print Head Unit

• This product employs a Class 3b laser diode that emits an invisible laser beam. The laser diode and the scanning polygon mirror are incorporated in the print head unit.

• The print head unit is NOT A FIELD SERVICE ITEM. Therefore, the print head unit should not be opened under any circumstances.

Laser Aperture of the Print Head Unit

4134G001AA

This figure shows the view inside the Top Cover with the Toner Cartridge and the Drum Cartridge removed.

the U.S.A., Canada (CDRH Regulation)

• This machine is certified as a Class I Laser product under Radiation Performance Standard according to the Food, Drug and Cosmetic Act of 1990. Compliance is mandatory for Laser products marketed in the United States and is reported to the Center for Devices and Radiological Health (CDRH) of the U.S. Food and Drug Administration of the U.S. Department of Health and Human Services (DHHS). This means that the device does not produce hazardous laser radiation.

• The label shown to page 13 indicates compliance with the CDRH regulations and must be attached to laser products marketed in the United States.

CAUTION

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

semiconductor laser

Maximum power of the laser diode 15 mW

Wavelength 770-800 nm

All Areas

CAUTION

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

semiconductor laser

Maximum power of the laser diode 15 mW

Wavelength 770-800 nm

Denmark

ADVARSEL

Usynlig laserstråling ved åbning, når sikkerhedsafbrydere er ude af funktion. Undgå udsættelse for stråling. Klasse 1 laser produkt der opfylder IEC60825 sikkerheds kravene.

halvlederlaser

Laserdiodens højeste styrke 15 mW

bølgelængden 770-800 nm

Finland, Sweden

LUOKAN 1 LASERLAITE KLASS 1 LASER APPARAT

VAROITUS!

Laitteen käyttäminen muulla kuin tässä käyttöohjeessa mainitulla tavalla saattaa altistaa käyttäjän turvallisuusluokan 1 ylittävälle näkymättömälle lasersäteilylle.

puolijohdelaser

Laserdiodin suurin teho 15 mW

aallonpituus 770-800 nm

VARNING!

Om apparaten används på annat sätt än i denna bruksanvisning specificerats, kan användaren utsättas för osynlig laserstrålning, som överskrider gränsen för laserklass 1.

halvledarlaser

Den maximala effekten för laserdioden 15 mW

våglängden 770-800 nm

VARO!

Avattaessa ja suojalukitus ohitettaessa olet alttiina näkymättomälle lasersäteilylle. Älä katso säteeseen.

VARNING!

Osynlig laserstråining när denna del är öppnad och spärren är urkopplad. Betrakta ej stråien.

Norway

ADVERSEL

Dersom apparatet brukes på annen måte enn spesifisert i denne bruksanvisning, kan brukeren utsettes för unsynlig laserstrålning, som overskrider grensen for laser klass 1.

halvleder laser

Maksimal effekt till laserdiode 15 mW

bølgelengde 770-800 nm

1-7. Laser Safety Label

• A laser safety label is attached to the the machine as shown below.

C4134o118AA

C4134o146AB

1-8. Laser Caution Label

• A laser caution label is attached to the inside of the machine as shown below.

C4134o066AD

1-9. PRECAUTIONS FOR HANDLING THE LASER EQUIPMENT

• When laser protective goggles are to be used, select ones with a lens conforming to the above specifications.

• When a disassembly 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 printer OFF.

• If the job requires that the printer be left ON, take off your watch and ring and wear laser protective goggles.

• A highly reflective tool can be dangerous if it is brought into the laser beam path. Use utmost care when handling tools on the user’s premises.

• The Print Head are not to be disassembled or adjusted in the field. Replace the Unit or Assembly including the Control Board. Therefore, remove the Laser Diode, and do not perform Control Board trimmer adjustment.

SAFETY PRECAUTIONS FOR INSPECTION AND SERVICE 3

Warning 3 Caution 5 Used Batteries Precautions 7 Other Precautions 8 Precautions for Service 8 Safety information 12 Laser Safety Label 15 Laser Caution Label 15 PRECAUTIONS FOR HANDLING THE LASER EQUIPMENT 16

CONTENTS 17 GENERAL 23

SPECIFICATIONS 25 Precautions for Installation 28

Installation Site 28 Power Source 28 Space Requirements 29

Precautions for Use 30

To ensure that the printer is used in an optimum condition 30 Operating Environment 30 Power Requirements 30

Other Precautions 30 Handling Consumables 31 List of Names 32

MECHANICAL/ELECTRICAL 33

Cross-Section View 35 Electrical Parts Layout 36

Printer 36

Controller 38 Operating sequence 39 Image stabilization control 40

Image Stabilization Control 40

Operation Timing 41

Image stabilization control flow 42

AIDC Sensor 43 Print Head (PH) 44

System Configuration 44

Laser exposure process 45

Laser emission timing 46

Laser emission area 47

Cooling of Print Head Unit 48 Print Unit 49

System Configuration 49

Drive Print Unit 50

Print Unit Detection 51

Toner Cartridge detection 51

PC Drum 52

PC Drum Charging 53 Developing Section 55 Cleaner 60

IMAGE TRANSFER SECTION 61

Construction of Transfer Belt Unit 61 Transfer Belt Unit Drive 62 New Transfer Belt Unit Detection 62 Transfer Belt Unit Set Detection 63 Color Shift Detection 64 Color Shift Correction 65 First Image Transfer Roller Pressure/Retraction Mechanism 67 2nd Image Transfer Pressure/Retraction Mechanism 69 2nd Image Transfer 70 2nd Image Transfer 70 Image Transfer ATVC Control 71 Temperature/Humidity Sensor 72 Transfer Belt Cleaning Mechanism 73 Cleaning the 2nd Image Transfer Roller 73 Waste Toner Box 74

Fusing Section 75

Drive of Fuser Unit 75 Fuser Unit Drive 76 Control of Loop Before Fusing 76 New Fuser Unit Detection 77 Pressure of Fusing Roller 77 Temperature Control 78

Paper Take-Up 82

1st Drawer 82 2nd Drawer (Add-on Cassette: Optional) 86 Manual Bypass Paper Take-Up Unit (optional) 91

Transport Section 92

Synchronizing Roller Drive 92 Image Transfer Failure Prevention During High Humidity 92 Switch of system speed 93 OHP Detecting 93

Duplex Unit (optional) 94

Drive of Duplex Unit 94 PAPER FEEDING SYSTEM 95

MAINTENANCE 99

Maintenance Schedule List 101

Guidelines for Life-time Expected Values by Unit 103 Disassembly/Reassembly and Cleaning 105 Replacing the Units 110

ASSEMBLY/ DISASSEMBLY 125

SERVICE INSTRUCTIONS 127

IDENTIFICATION OF FUSES 127

PARTS WHICH MUST NOT BE TOUCHED 128

ASSEMBLY/DISASSEMBLY 129

Doors, Covers and Exterior Parts 129 Removing Doors, Covers and Exterior Parts 130 Removing Circuit Boards and other Electrical Components 134 Removing Units 149 CLEANING AND DISASSEMBLY OF THE ENGINE PARTS 158 Disassembing the Manual Feed Unit (optional) 167 Disassembling the Duplex Unit (optional) 170 Disassembling the Paper Feed Unit (optional) 175

CONTROL PANEL Panel Menu Operations 177

Control Panel 179

Names and Functions of Control Panel Keys 179 Control Panel Display 181 Control Panel Message 182 Canceling a Print Job 186

Panel Menu 187

Summary of Panel Menu 187 Sub-menu 188 Contents of Panel Menu 193

MAINTENANCE MODE 198

SETTING THE MAINTENANCE MODE 198 Summary of the Maintenance Mode 199 Maintenance Menu 199 CONTENTS OF MAINTENANCE MODE 200

UPDATE FIRMWARE 202

Update using IEEE-1284 Parallel Cable 202 Network Cable (FTP) Update 204 WHEN UPDATE FAILS 206

TROUBLESHOOTING 207

INTRODUCTION 209

Checking the electrical components 209 System Control Block Diagram 213

Jam 214

Initial Check Items 214 Misfeed Display 215 Misfeed Detecting Sensor Layout 216 Misfeed Detection Timing/Troubleshooting Procedures 217

MALFUNCTIONS 227

MALFUNCTION CODES 227 Malfunction Detection Timing and Troubleshooting Procedure 230

Power Supply-Related Malfunctions 248

Printer is not energized at all 248

Other Precautions 249

Emergency Stop Error 249 Print Prohibition Error 250

Warning Error 250 Image Problem 252

Troubleshooting Procedure by a Particular Image Quality Problem 252

GENERAL

1. SPECIFICATIONS

Printer

Desktop tandem color laser beam printer

TYPE Printing System Exposure System Printing Density Paper Size

Paper Type

Fast Print Time

Multi-page Print Speed

Warm-Up Time

System Speed Paper Feeding System

Paper Ejection Method Charging System Developing System Image Transfer System PC Drum PC Drum Cleaning Paper Separator System Fusing System Dimensions Weight Power Requirements

Max. Power Consumption Operating Noise

Semiconductor laser and electrostatic image transfer to plain

paper

Laser diode and polygon mirror

600 × 600 dpi

1st Drawer: A5, ISO B5, JIS B5, A4, B4, A3, Oversized, Folio, SP Folio, Statement, Executive, Government Letter, Letter, Government Legal, Legal, 11 × 17, 8 × 10, Foolscap, 12 × 18, Com10, DL, Monarch, C5, C6, Chokei #3, Chokei #4, Chinese 8K, Chinese 16K, Chinese 32K, Japanese official postcards, Irregular size (90 × 148 mm - 311 × 457 mm) 2nd Drawer: JIS B5, A4, B4, A3, Letter, Legal, Ledger 1st Drawer: plain paper, recycled paper (64-90 g/m

paper, envelopes, label sheets, thick paper (91-210 g/m and japanese official postcards 2nd Drawer: plain paper, recycled paper (64-90 g/m

For monochrome printing: 13 sec. (for A4C, 1st Drawer) For full color printing: 16 sec. (for A4C, 1st Drawer)

21.6 sheets/minute (for A4C, 1st Drawer)

20.5 sheets/minute (for Letter C, 1st Drawer)

Within 99.9 seconds (at a room temperature of 23°C and at the rated voltage)

90.3 mm/sec

2-way system (maximum 5-way) *1 250 sheets of plain paper, recycled paper, 10 envelopes, 50 sheets of thick paper, label sheets, OHP transparencies, japanese official postcards 2nd Drawer (500 sheets) Expandable to 5-way system by installing the optional 3rd and 4th Drawer paper cassettes

Face-down (tray capacity: 250 sheets)

DC comb electrode Scorotron System

Single-element developing system

Intermediate Image Transfer Belt System

OPC

Blade system

Curvature separation + charge-neutralizing system

Heated roller fusing system (Oil is not used)

628 mm (W) × 594 mm (D) × 564 mm (H)

58.6 kg (with PU/TC)

120 V, 60 Hz ± 3 Hz, 12 A 220-240 V, 50-60 Hz ± 3 Hz, 6.5 A

1,400 W

During standby:40 dB (A) or less During printing: 50 dB (A) or less (1st Drawer), 53 dB (A) or less (2nd Drawer)

), OHP

)

Environmental Conditions

Option

Lower Feeder Unit (optional)

Name Paper Type Paper Size Capacity Paper Feed Separator Power Requirements Size Weight

Duplex Unit Kit (optional)

Name Paper Type Paper Size

Print speed (doublesided printing)

Paper transfer baseline Power Requirements Size Weight

::10-32.5 °C

15-85% Paper Feed Unit, Duplex Unit Kit (with Manual Feed Unit)

Lower Feeder Unit

Plain paper (64-90 g/m

: :

JIS B5, A4, B4, A3, Letter, Legal, Ledger

500 sheets (64 g/m

Torque Limiter Method

Supplied by main unit

575 mm (W) × 568 mm (D) × 127 mm (H)

8.5 kg

Duplex Unit

Plain paper (64-90 g/m

: :

A5, JIS B5, A4, B4, A3, Folio, SP Folio, Statement,

), recycled paper (64-90 g/m2),

)

), recycled paper (64-90 g/m2)

Executive, Government Letter, Letter, Government Legal, Legal, Ledger, 8 × 10, Foolscap, Irregular size (90 × 148 mm

- 297 × 432 mm)

17.5 pages/minute (for A4C, 1st Drawer)

17.0 pages/minute (for Letter C, 1st Drawer)

Center baseline

Supplied by main unit

65 mm (W) × 445 mm (D) × 311 mm (H)

2.1 kg

Name Paper Type

Paper Size

Capacity Power Requirements Size Weight

Manual Feed Unit

Plain paper (64-90 g/m

), recycled paper (64-90 g/m2), OHP paper, envelopes, label sheets, thick paper (91-210 g/m government-standard postcards

A5, JIS B5, A4, B4, A3, Folio, SP Folio, Statement, Executive, Government Letter, Letter, Government Legal, Legal, Ledger, 8 × 10, Foolscap, ISO B5, Com10, DL, Monarch, C5, C6, Chokei #3, Chokei #4, Chinese 8K, Chinese 16K, Chinese 32K, Japanese-standard postcards, Irregular size (90 × 148 mm - 297 × 432 mm), Irregular size (210 × 433 mm - 297 × 900 mm) long paper (210 × 433 mm - 297 × 900 mm)

One sheet plain paper or one sheet specialty paper

Supplied by main unit

98 mm (W) × 410 mm (D) × 88 mm (H)

1.5 kg

Controller

Control Panel

CPU Emulation

Built-in fonts

Memory

Interface

Network Protocol Optional Expansion Memory

Optional HDD

Message Window (16 digits × 2 lines), Indicator × 5, Switch × 8, Buzzer

64 bits/266MHz PowerPC RISC Processor

PostScript Level 3, PDF Ver.1.3 (optional HDD required) Kanji fonts 2Style (Heisei Gothic W5, Heisei Mincho W3) European fonts 137 PostScript fonts

Boot ROM (512 KB), Program ROM (16 MB), EEPROM (512 B), SDRAM DIMM128 MB (2 memory slots, maximum 512

MB), Ethernet (10Base-T/100Base-TX)

Parallel (Centronics/IEEE-1284) USB (USB Rev. 1.1) TCP/IP, IPX/SPX, EtherTalk

128 MB, 256 MB

Type SDRAM DIMM, PC-133, 168pin, no ECC, Nonbuffered, CL=3 30 GB

Type 2.5 inch IDE disk, PIO Mode 4/UDMA 66

2. PRECAUTIONS FOR INSTALLATION

2-1. Installation Site

To ensure safety and utmost performance of the printer, the printer should NOT be used in a place:

• Where it will be subjected to extremely high or low temperature or humidity.

• Where it will be subjected to sudden fluctuations in either temperature or humidity.

• Is subject to direct sunlight.

• Which is in the direct air stream of an air conditioner, heater, or ventilator.

• Which has poor ventilation or is dusty.

• Which does not have a stable, level floor or where it will receive excessive vibration.

• Which is near any kind of heating device.

• Which is near volatile flammables (paint thinner, gasoline, etc.).

• Where it may be splashed with water.

• Which puts the operator in the direct stream of exhaust from the printer.

• Where ammonia gas might be generated.

2-2. Power Source

• If any other electrical equipment is connected to the same power outlet, make sure that the capacity of the outlet is not exceeded.

• Use a power source with minimal voltage fluctuation.

• Never connect to the outlet by means of a multiple socket, power strip or any other appliances or devices.

• Ensure that the printer does not rest on the power cord or communication cable of other electrical equipment, and that cords do not become wedged into or underneath the device.

• 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 anything, including the printer itself, rest on the power cord?

Use an outlet with a capacity of 120 V, 12 A or more. 220-240 V, 6.5 A or more.

2-3. Grounding

• Always ground the printer to prevent electrical shock in the event of an electrical short.

• Connect the ground wire to the ground terminal of the outlet or a grounding contact which complies with local electrical codes.

• To avoid the risk of fire or electrical shock, never connect the ground wire to a gas pipe, the ground wire for a telephone, a lightning rod, or a water pipe.

2-4. Space Requirements

• To ensure easy machine operation, replacement of consumables, and maintenance service job, provide the following space for the installation of the machine.

300

694

947

774

1012

100

594

Unit: mm

4134G003AA

3. PRECAUTIONS FOR USE

3-1. To ensure that the printer is used in an optimum condition

• never place heavy objects on the printer or subject the printer to shocks.

• Insert the power plug all the way into the outlet.

• Never remove secured panels or covers while the unit is printing.

• Never turn off the unit while it is printing.

• Provide good ventilation when using the printer in a confined space for a long period of time.

• Never use flammable sprays near the printer.

• If the printer becomes exceptionally hot or produces abnormal noise, turn it off and unplug it.

• Do not turn on the power switch at the same time that 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 printer.

• Do not place a vase or vessel containing water on the printer.

• 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 printer.

3-2. Operating Environment

The operating environmental requirements of the printer are as follows.

• Temperature: 10-32.5°C

• Humidity: 15-85%

• Rate of temperature change: 10°C/h, 50° F/h

• Rate of humidity change: 20% RH/h

3-3. Power Requirements

The power source voltage requirements are as follows.

• Voltage fluctuations AC 120, 220-240 V ± 10%

• Frequency fluctuations 50-60 Hz ± 3 Hz

3-4. Other Precautions

Use the following precautions when performing service on a printer that uses a laser.

• When servicing parts in the path of the laser beam (near the Print Head or PC drum), be sure to first unplug the power supply cord for the unit.

• If the service requires that the power cord be left plugged in, observe the following precautions.

1. Remove your watch, rings and any other reflective objects and wear laser protective

goggles.

2. Keep other personnel away from the service area.

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

4. HANDLING CONSUMABLES

Before using any consumables, always read the container label carefully.

• Paper can be easily damaged by dampness. To keep paper that has been removed from the wrapper as dry as possible until it is loaded to the printer, store in a sealed plastic bag in a cool, dark place.

• Keep consumables out of the reach of children.

• Do not touch the PC Drum with bare hands.

• The same sized paper is of two kinds, short grain and long grain. Short grain paper should only be fed through the printer crosswise, long grain paper should only be fed lengthwise. The packing material will be marked.

• If your hands become soiled with toner, wash them with soap and water.

• Do not throw away any used consumables or used parts, as they should be collected.

• Do not burn, bury, or pour any consumables down the drain.

• Do not store consumables in a place which:

✽ Is hot and humid. ✽ Is subject to direct sunlight. ✽ Has an open flame nearby.

5. LIST OF NAMES

4134G004AA

1. 2nd Drawer

2. 1st Drawer

3. Front Door

4. Paper Output Tray

5. Right-side Door Release Lever

6. Duplex Unit (optional)

7. Manual Feed Unit (optional)

8. Power Switch

4134G005AA

9. Power Supply Cord Socket

MECHANICAL/

ELECTRICAL

1. CROSS-SECTION VIEW

1. Print Unit

2. Toner Cartridge

3. Print Head Unit

4. Paper Exit Roller

5. Fuser Unit

6. Duplex Unit (optional)

7. 2nd Image Transfer Roller

8. Synchronizing Roller Unit

9. Manual Feed Unit (optional)

10. Multi-Paper Feed Drawer

11. Paper Feed Unit

12. Transfer Belt Unit

4134M001AA

✽ Paper path The paper feed method is a 2-way system comprised of the Multi-Paper Feed drawer (250 sheets) and the Paper Feed Unit (500 sheets). Expandable to a 5-way system by installing up to 2 additional units: the optional Manual Feed Unit and the Paper Feed Unit (500 sheets).

• Paper fed from each Paper Feed Drawer is transported to the Vertical Transport, image transfer is then performed by the 2nd Image Transfer roller, the image is fused by the Fuser Unit and fed out face down.

• For 2-sided copying, first the 2nd side is copied and as soon as the paper moves past the Fuser Unit, the transport path is switched, the paper is turned over and is transported to the Duplex Unit. Since a Circulating System is used, the paper is copied on the 1st side and then fed out.

2. ELECTRICAL PARTS LAYOUT

2-1. Printer

Front

1. Exit Full Detecting Sensor (PC5)

2. Heater Switch Thermistor (TH3)

3. Fusing Pressure Roller Thermistor (TH2)

4. Heating Roller Thermistor (TH1)

5. Fusing Cooling Fan Motor (M24)

6. Heating Roller Thermostat (TS1)

7. Paper Exit Detecting Sensor (PC4)

8. Fusing Pressure Roller Thermostat (TS2)

9. Fusing Pressure Roller Heater Lamp (H3)

10. Heating Roller Heater Lamp 1 (H1)

11. Heating Roller Heater Lamp 2 (H2)

12. Control Panel (UN1)

13. Loop Correction Detecting Sensor (PC3)

14. OHP Detecting Sensor (PC1)

15. Synchronizing Roller Front Sensor (PC2)

16. 1st Drawer Paper Empty Detection Sensor (PC10)

17. Print Head Cooling fan motor (M8)

18. Temperature/Humidity Sensor (PC21)

4134M101AA

19. 1st Drawer Paper Size/Width Detecting Sensor (PC11)

20. AIDC Sensor (PC22)

21. Waste Toner Full Detecting Sensor (PC20)

22. Front Door Open/Close Detecting Switch(S2)

23. Power Supply Cooling Fan Motor (M6)

24. Front door switch (S1)

25. DC Power Supply (PU1)

26. Controller Board (PWB-Z)

27. Control Board (PWB-A)

28. 1st Drawer Paper Near Empty Detecting Sensor (PC9)

29. 1st Drawer Set Detecting Sensor (PC7)

30. Print Head Unit

31. Duplex Unit Drive Motor

32. Duplex Door Detecting Sensor (PC6)

33. Duplex Unit Control Board (PWB-A)

34. Manual Feed Motor

35. Manual Feed Detecting Board (PWBY)

36. Manual Feed Detecting Switch(S4)

4134M513AA

Rear

40 41 42

37. Registration Sensor (PC23)

38. Ozone Fan Motor (M9)

39. Toner Empty Detecting Sensor Bk (PC16)

40. High Voltage Unit (HV1)

41. 1st Image Transfer Pressure/Retraction Detecting Sensor (PC24)

42. Transfer Belt Unit Detecting Sensor (PC26)

43. Heater Lamp Control Board (PWB-T)

44. Print Unit Drive Motor Bk (M4)

45. 1st Image Transfer Pressure/Retraction Clutch (CL1)

46. 1st Drawer Paper Size/Length Detecting Board (PWB-PS)

47. Print Unit Drive Motor YMC(M5)

48. High Voltage Unit 2

49. Print Unit Cooling Fan Motor (M12)

50. Paper Feed Drive Motor (M1)

51. High Resistance Board (PWB-R)

52. Transport Drive Motor (M2)

53. Right door switch (S3)

54. Right Door Open/Close Detecting Sensor (PC27)

55. Suction Fan Motor (M13)

56. 2nd Image Transfer Pressure/Retraction Detecting Sensor (PC25)

57. Fusing Drive Motor (M3)

58. Drawer Empty Detecting Sensor Y (PC19)

59. Toner Cartridge Detecting Sensor Y (PC15)

60. Toner Empty Detecting Sensor M (PC18)

61. Toner Cartridge Detecting Sensor M (PC14)

62. Toner Empty Detecting Sensor C (PC17)

63. Toner Cartridge Detecting Sensor C (PC13)

64. Toner Cartridge Detecting Sensor Bk (PC12)

4134M102AA

2-2. Controller

Symbol Item Function

CNINF Connector IEEE1284 Parallel Connector

CNVD Connector Connector for the Print Unit CNLC Connector Connector for the Control Board CNOP Connector Connector for the Control Panel

CNROM Connector Connector for the Smart Media Card

CNHDD Connector Connector for the Hard Disk

CNLAN Connector Connector for the 10/100 Base-TX Ethernet RJ45

CNUSB2 Connector Connector for the USB

DIMM0 Standard slot 168 pin SDRAM memory DIMM1 Expansion Slot 168 pin SDRAM Expansion memory

BATT1 Battery Lithium battery for clock

LED1

LED4

SW1 SW CS Save (maintenance) Switch

LSI1 IC

LSI2 IC Correction LSI (Color match correction)

IC1 IC CPU, Controller control

IC9 EEPROM

Light Emitting

Diode (LED)

Light Emitting

Diode (LED)

LAN Link Display LED (Amber)

LAN Speed Display LED (Green)

Drawing LSI (Image data processing, control panel control, HDD control)

System Data Storage (MAC address, Counter information etc.)

4134S501AA

3. OPERATING SEQUENCE

✽ Conditions: plain A4 paper, full color printing

C4134S002CA

1. IMAGE STABILIZATION CONTROL

• Consistent image output can be achieved by adjusting the developing bias charge and the laser intensity. In addition, registration correction control is performed to prevent color shift.

1-1. Image Stabilization Control

• Image Stabilization Control is divided into 2 types, full correction control and simple correction control. Below is an explanation of each type of control.

Control name Purpose

Leak detection

control

2 AIDC intensity control

Maximum density

control

Color shift correction

control

Laser intensity

control

6 Gamma curve control

Simple correction

control

✽ Full correction control is complete control 1 through 6.

Set the optimum developing bias charge for the space between the PC Drum and the Developing Roller to prevent uneven density and leak images.

Adjusts the intensity of the LED light to ensure a constant output value provided by the AIDC Sensor for a surface of the Image Transfer Belt, to which no toner sticks, thereby controlling variations in characteristics caused by time and contamination.

Adjusts the pulse width ratio of the developing bias to keep constant the amount of toner sticking to the surface of the PC Drum for a 100% solid image.

The Registration Sensor detects the amount of color shift in the main scanning and sub-scanning directions, and adjusts laser emission timing.

Adjusts the intensity of the laser light to ensure constant line and gradation reproduction with changes in characteristics of the PC Drum, developing, and drum charging due to environmental changes and durability issues.

Makes a gradation correction by producing a pattern on the Image Transfer Belt, measuring the image density of the pattern with the AIDC Sensor, and sending the measurement results to the controller.

1 Complete execution of Control 1 through 6 is time consuming and consumes more toner. Therefore, simple correction is executed to reduce the amount of time required and toner consumed. In addition, if correction can not be completed by simple correction, then full correction is executed.

1-2. Operation Timing

• Full correction control and simple correction control timing is performed as shown below.

Simple Correction Control Timing Full Correction Control Timing

When turning the Power Switch OFF and ON.

When Front Door is opened and closed When a new Toner Cartridge is detected. When sleep mode is cancelled. When a new Print Unit is detected. Printing continuous (when not in a constant

environment). After printing is complete (when not in a

constant environment).

When a substantial shift occurs after simple correction is executed

When a new Transfer Belt Unit is detected.

When a leak occurs during simple leak detection.

1-3. Image stabilization control flow

C4134S022CB

1-4. AIDC Sensor

• The AIDC sensor uses a reflective sensor to detect the amount of toner that sticks to the Image Transfer Belt. Image stabilization is performed based on the value detected.

Photoreceiver

The surface of the Image Trans-

C4134S003AA

AIDC Sensor

1. The light-emitting diode emits infrared rays illuminating the toner pattern on the Trans-

fer Belt.

2. The photoreceiver detects the intensity of the infrared light reflected from the toner pat-

tern on the Image Transfer Belt.

3. A voltage corresponding to the intensity of the reflected light is sent to the Master Board

(PWB-A).

Amount of Toner Sticking Intensity of Light Reflected Output

Large Small Low Small Great High

fer Belt

LED

4004M532AA

1. PRINT HEAD (PH)

1-1. System Configuration

• Four semiconductors are arranged for each color, and scanning is performed by 1polygon motor.

13 12

4134M002AA

1. Semiconductor laser Bk

2. Semiconductor laser C

3. Semiconductor laser M

4. Semiconductor laser Y

5. Polygon Mirror

6. G1 lens

7. G2 lens

8. G3 lens

9. SOS Lens

10. SOS Sensor

11. Return Mirror

12. Separation Mirror (BK, C, M)

13. SOS Mirror

14. Cylindrical Lens

15. Return Mirror (light source)

16. Synthetic Mirror (BK, C, M)

1-2. Laser exposure process

Polygon Mirror

Polygon Motor

SOS Lens

G1 G2

SOS Mirror

Separation Mirror (Bk)

4134M030AA

Separation Mirror

Return Mirror

4134M029AA

1. Y The Y laser light enters the cylindrical lens via the return mirror (light source) and the C, M, Bk laser enters the cylindrical lens via the synthetic mirror and the return mirror (light source).

2. At the cylindrical lens, the sub-scanning direction of each laser light is condensed in the vicinity of the polygon mirror.

3. Since the angle of incidence for each color of laser light varies, the laser light reflected by the polygon mirror is reflected in a different angle for each color.

4. The condensing angle of each color of laser light is corrected by the G1 and G2 lenses and then reaches each return mirror.

5. Y The Y laser beam is condensed on the PC Drum via the return mirror and the G3 lens. The Bk, M and C laser beams are condensed on the PC Drum via the separation mirror, return mirror and the G3 lens.

1-3. Laser emission timing

• When Print is ON, after a fixed amount of time, the “ready” signal is detected and the laser ON signal is output.

• The laser ON signal triggers the firing of each laser beam which is illuminated onto the SOS board via the reflecting mirror → cylindrical lens → polygon mirror → G1 and G2 lenses → separation mirror → (Bk) SOS mirror and the SOS lens until an SOS signal is generated.

• This SOS signal unifies the timing in which the laser beams are radiated for each main scanning line.

• The SOS signal is only generated from the Bk laser beam but for the other colors, the emission timing is determined with Bk as a basis.

Polygon Mirror

SOS sensor

SOS Mirror

Separation mirror (For Bk)

4134M030AA

1-4. Laser emission area

(1) FD Direction

• The laser print timing determines the FD print start signal (/HSYNC) that is output from the control board and the print start position for the width of the paper size.

• The laser emission area is determined by the paper size. However, 5 mm on both sides of the paper is the void image area.

(2) CD Direction

• The laser print timing determines the CD print start signal (/TOD) that is output from the control board and the print start position for the length of the paper size.

• The laser emission area is determined by the paper size. However, 5 mm at the leading/ trailing edges is the void image area.

Void width : 5 mm

Void width: 5 mm

C4134S021AA

1-5. Cooling of Print Head Unit

• The PH cooling fan motor draws air from around the Print Head Unit to the outside to prevent the unit temperature from rising.

PH Cooling Fan Motor

Duct

4134M048AA

1. PRINT UNIT

1-1. System Configuration

• Each Print Unit is laid out from the left in the order of Bk, C, M, Y.

• Each of the four colors is provided with a separate reproduction process and is configured with a PC Drum, developer, cleaner, PC Drum charge and a toner cartridge.

1. Toner Cartridge (TC)

2. PC Drum Charge Corona

3. Cleaning Blade

4. PC Drum

5. Developer Roller

6. Cyan Print Unit

7. Magenta Print Unit

8. Yellow Print Unit

C4134S005AA

1-2. Drive Print Unit

(1) Drive Overall Unit

• The Print Unit Bk and the Image Transfer Belt provide the drive for the Print Unit Drive Motor Bk that turns the PC Drum and the Image Transfer Belt.

• Print Units C, M, and Y provide the drive for the Print Unit Drive Motor C, M, and Y that turns the PC Drum.

• In order to eliminate image noise caused by uneven rotation of the PC Drum and Image Transfer Belt, a mol gear is used to perform drive coupling.

Print Unit Drive Motor (C, M, and Y)

Print Unit Drive Gear

Print Unit Drive Motor (Bk)

(2) Drive in Unit

• The drive in the unit rotates the waste toner transport screw by means of the PC Drum gear and then rotates the Developing Roller, Supply Roller and Paddle Roller via a Timing Belt.

4134M004AA

Agitating

Timing Belt

Coupling

Paddle Screw

Supply Roller

Developer Roller

PC Drum

Transport Screw

4134M031AA

1-3. Print Unit Detection

(1) Set detection

• The set detection for each Print Unit detects whether fusing takes place from the EEPROM board when the power is OFF/ON and the front door is OPENED/CLOSED.

(2) New unit detection

• New unit detection for each Print Unit is performed by the EEPROM board.

Toner Cartridge

Print Unit

4134M021AA

1-4. Toner Cartridge detection

(1) Set detection

• When the toner cartridge is inserted into the print unit, the cartridge pushes up against the actuator, the set detection sensor is turned ON, and the toner cartridge is detected.

Toner Cartridge Detecting Sensor

Toner Cartridge

(2) New unit detection

• New unit detection is performed by energizing to the fuse in the new cartride, and fusing.

4134M027AA

1-5. PC Drum

• The photo conductive drum used in this printer is the organic photo conductor (OPC) type.

✽ The PC Drum is laminated, coated with a carrier generation layer and a charge holding

layer on an aluminum based cylinder.

Handling If this type of PC Drum is exposed to light for a long period of time, it exhibits light fatigue which causes changes in sensitivity. Therefore, when removing the PC Drum from the printer, cover it with a clean dry cloth to protect it from the light. Also, be careful not to get dirt on the surface of the PC Drum.

Charge Holding Layer Carrier Genera-

tion Layer

Aluminum Base

1167M007AA

1139M007AA

• PC Drum Ground

✽ The ground contact for the PC drum is on the inside at the front of the drum and normally

contacts the shaft on the front plate of the print unit. When the print unit is installed into the printer, the mounting pin on the front plate of the print unit contacts the frame of the printer. In this way, the electrical potential exposed to the PC drum is transmitted from the ground plate to the shaft and the mounting pin, and grounded with the frame.

PC Drum

Ground Plate

Shaft

C4134S007AA

1-6. PC Drum Charging

• The PC Drum Charge Corona employs a comb electrode Scorotron charger system.

• DC(-) corona charge is applied to the comb electrode, which applies a uniform charge to the surface of the PC Drum via the grid mesh.

• Using a comb electrode ensures that a charge is concentrated on the grid mesh, thus reducing the amount of ozone produced.

Comb Electrode Charger

Grid Mesh

PC Drum

4134M018AA

Comb Electrode Charger

PC Drum

4134M019AA

(1) Charged area Ozone Ventilation

• The ozone generated by the PC Drum charger for each color is taken in by the Ozone Fan Motor, goes through a duct in the rear and gets absorbed through the Ozone Fan Filter so that only ozone-free air is emitted from the printer.

Ozone Filter DuctOzone Fan Motor

Suction Entrance

Print Unit

4134M020AB

1-7. Developing Section

(1) Composition

• The Toner Cartridge and Developing Unit are constructed as illustrated below.

Toner Cartridge

1. Second Regulator Blade

2. PC Drum

3. Charge Neutralizing Seal

4. Developer Roller

5. Supply Roller

6. Paddle Screw

7. Buffer

4134M517AA

Print Unit

8. First Regulator Blade

9. Agitating Paddle

10. Hopper

11. Toner Cartridge

4134M021AA

(2) Toner Conveyor

1. The toner drops from the toner cartridge into the hopper inside the Print Unit.

2. The Agitating Paddle mixes the toner while conveying it to the buffer.

3. The toner is then conveyed onto the Developer Roller via the paddle screw and Supply

Roller.

4. The amount of toner on the Developer Roller is regulated by the 1st Regulator Blade.

5. The toner is then negatively charged by the 2nd Regulator Blade.

6. Toner sticks to the electrostatic latent image on the surface of the PC Drum.

7. The remaining toner is discharged via a charge neutralizing seal and conveyed to the

Supply Roller.

Toner Replenishing

Paddle Screw

Supply Roller

Developer Roller

Agitating Paddle

2nd Regulator Blade

4134M051AA

Toner Cartridge

Charge Neutralizing Seal

Developer Roller

Hopper

Buffer

1st Regulator Blade

Paddle Screw

Supply Roller

4134M517AA

(3) Developing System

• Two types of Developing Systems are used, a non-contact developing system and an alternating current application system.

1. A negative charge is applied to the Supply Roller and toner sticks to the Developer

Roller.

2. The toner is evened out by the 1st Regulator Blade.

3. A negative charge is applied to the 2nd Regulator Blade and the toner is negatively

charged.

4. Since an alternating current is applied to the Developer Roller, if there is negative ele-

ment, the toner sticks to the PC Drum. In addition, the image density is determined by the time for the negative element.

4134M515AA

1. PC Drum

2. 2nd Regulator Blade

3. 1st Regulator Blade

4. Supply Roller

5. Charge Neutralizing Seal

6. Developer Roller

(4) Toner Level Detection

Toner level detection is performed by a combination of two methods: toner consumption prediction control method and mechanical detection method 2.

1. Prediction control method

• The amount of toner consumed is computed by dot count for each color.

2. Mechanical detection method

• The amount of overlap of Disk Plate 1 attached to the Agitating Paddle shaft and Disk Plate 2 on the gear is detected by a sensor according to the excess toner on the Agitating Paddle.

• When there is a great deal of toner, the load to the Agitating Paddle increases so the amount of overlap of Disk Plate 1 and 2 increases and the amount of time the sensor is ON is reduced.

• When there is a small amount of toner, the load to the Agitating Paddle decreases so the amount of overlap of Disk Plate 1 and 2 decreases and the amount of time the sensor is ON is increased.

3. Toner Empty Detection

• The toner level is detected by the mechanical detection, the value for the amount of toner consumed is computed and fed back and toner near-empty or toner-empty is detected.

• When toner near-empty or toner-empty is detected, a message is displayed on the control panel.

A lot of toner. Toner is low.

Disk Plate 2

Toner Empty Sensor

Disk Plate 1

4134M023AA

(5) Toner Cartridge Shutter Open/Close Mechanism

• When the toner cartridge is installed into the print unit, the Open/Close Lever is lowered and Shutter 1 opens.

Open/Close Lever

4134M026AA

4134M024AA

• When the knob on the toner cartridge is turned to the right, Shutter 2 opens and toner is conveyed to the Print Unit.

4134M026AA

1-8. Cleaner

• The Cleaning Blade Method is used to remove the toner left on the PC Drum.

• The residual toner, which has been scraped off by the Cleaning Blade, is conveyed by the conveying screw and collected in the Waste Toner Box.

Cleaning Blade

PC Drum

Toner Conveying Screw

4134M028AA

1. IMAGE TRANSFER SECTION

1-1. Construction of Transfer Belt Unit

1. Drive Roller

2. PC Drum

3. Waste Toner Conveying Coil

4. Cleaner Receive Roller

5. Driven Roller

6. 2nd Image Transfer Roller

7. Transfer Belt

8. Cleaner Braid

9. Tension Roller

10. 1st Image Transfer Roller

4134M500AA

1-2. Transfer Belt Unit Drive

• The Print Unit Drive Motor Bk allows the drive to rotate the drive roller via the clutch and gear.

4134M032AA

C4134S023AA

1. Print Unit Drive Motor Bk (M4)

2. Drive Gear

3. Drive Roller

4. 1st Image Transfer Pressure/Retraction Clutch (CL1)

1-3. New Transfer Belt Unit Detection

• When a new Transfer Belt Unit is installed, the Shading Plate moves in the direction of the arrow from the pressure of the 1st Image Transfer Roller and is locked into position.

• The Shading Plate moves only once.

• The Shading Plate blocks the detecting sensor and a new Transfer Belt Unit is detected.

4134M504AA

Transfer Belt Unit Detecting Sensor (PC26)

Shading Plate

1-4. Transfer Belt Unit Set Detection

• The set detection of the Transfer Belt Unit is performed by the shading of the 1st Image Transfer Pressure/Retraction Detecting Sensor.

Pressure Cam

Drive Gear

First Image Transfer Pressure/Retraction Detection Sensor (PC24)

1st Image Transfer Roller

Shading Plate

Transfer Belt

Drive Roller

4134M045AA

1-5. Color Shift Detection

• Patterns are produced on the surface of the Transfer Belt and the Registration Sensors detect any color misalignment on the patterns.

(1) Simple correction

• One pattern is produced in the main scanning and sub-scanning directions on the Transfer Belt.

• The pattern is the value determined by applying the last degree of correction.

Registration Sensor (PC23)

Pre-pattern

AIDC Sensor (PC22)

(2) Full correction

• Two patterns are produced in the main scanning and sub-scanning directions on the Transfer Belt twice.

• The pattern is the value determined by applying the last degree of correction.

Registration Sensor (PC23)

Pre-pattern

AIDC Sensor (PC22)

Sub-scanning pattern

Main scanning simple pattern

Y Bk

Main scanning pattern

Paper

Paper center

4134M510AA

4134M509AA

1-6. Color Shift Correction

• In a tandem engine provided with a separate image reproduction process for each of the four different colors of toner, incorrect color registration, or color shift, is more likely to occur due to positional deviations among different Print Head Units. Any misalignment among different colors is automatically detected and corrected both in the main scanning and sub-scanning directions to Bk.

• The color shift correction includes a simple correction and a full correction.

Print Head (PH) Unit

Timing in which color shift is corrected

Simple correction Full correction

1. Power Switch is turned ON.

2. After cooling the machine.

3. After returning from sleep mode.

4. When shifting occurs more than the constant amount.

4134M507AA

1. When toner is supplied and a new unit is detected for the IU.

2. When a substantial shift takes place after simple correction is performed.

2. A light-emitting diode emits infrared rays illuminating the color shift pattern on the Transfer Belt.

3. The infrared light reflected from the color shift pattern is detected by the photoreceiver.

4. A voltage corresponding to the intensity of the reflected light is output to the Master Board (PWB-A).

Registration Sensor (PC23)

Photoreceiver

C4134S003AA

AIDC Sensor (PC22)

Power SourceGNDOutput

LED

Transfer Belt

4004M532AA 1136M068AA

1-7. First Image Transfer Roller Pressure/Retraction Mechanism

(1) Pressure/Retraction Mechanism

• The rotation of the retraction gear causes the pressure cam to rotate and by raising the 1st Image Transfer Roller, pressure/retraction is applied to the Image Transfer Belt.

• When the 1st Image Transfer pressure/retraction clutch is ON, the rotation of the Print Unit Drive Motor Bk is relayed to the retraction gear.

• The pressure position is detected by the count of a predetermined period of time after the 1st Image Transfer Pressure/Retraction Detecting Sensor is ON.

• The retracted position is detected by the 1st Image Transfer Pressure/Retraction Detecting Sensor.

Pressure Cam

Retraction Gear

First Image Transfer Pressure/Retraction Detecting Sensor (PC24)

1st Image Transfer Roller

Shading Plate

Transfer Belt

Drive Roller

4134M045AA

(2) Pressure Position Switching Mechanism

• To prolong the durability of the Y, M, and C PC Drums, the pressure position of the Y, M, C transfer rollers is switched with that of the Bk transfer roller when in the monochrome mode.

• The switching of the pressure position changes the stop position of the cam based on the number of motor pulses.

• In monochrome mode, only the 1st Image Transfer Roller for Bk presses against the Image Transfer Belt.

• In color mode, the 1st Image Transfer rollers for all the colors, Y, M, C, Bk, press against the Image Transfer Belt.

Cam

4134M035AB

Standby Mode

Black and White Mode

Color Mode

1-8. 2nd Image Transfer Pressure/Retraction Mechanism

• The 2nd Image Transfer Pressure/Retraction Mechanism is performed by means of rotation of the supply Drive Motor.

• The cam rotates and the pressure lever applies pressure/retraction to the 2nd Image Transfer Roller.

• The pressure/retraction position is detected by the 2nd Image Transfer Roller Pressure/ Retraction Detecting Sensor.

Cam

Shading Plate

Retracted

2nd Image Transfer Pressure Detection Sensor (PC25)

Lever

2nd Image Transfer Roller Shaft

4134M036AB

Pressed

4134M037AB

1-9. 2nd Image Transfer

• By applying the 1st Image Transfer bias, the toner image on the PC Drum is transferred to the Transfer Belt in the order of: Y, M, C, Bk.

PC Drum

To ne r

1st Image Transfer Bias

1st Image Transfer Roller

Transfer Belt

4134M501AB

1-10. 2nd Image Transfer

• By applying the 2nd Image Transfer bias, the toner image on the Transfer Belt is transferred to the paper.

Driven

Cleaner Receive Roller

2nd Image Transfer Roller

Transfer Belt

2nd Image Transfer Bias

4134M502AB

1-11. Image Transfer ATVC Control

• The resistance value of the Second Image Transfer Roller and the Transfer Belt is measured and its voltage is controlled at the appropriate level.

• The 2nd Image Transfer ATVC adjustment is made when the Power Switch is turned ON or Front Door is opened and closed.

✽ ATVC: stands for Auto Transfer Voltage Control

• The 2nd Image Transfer ATVC current is output and resistance of the 2nd Image Transfer Roller is measured.

• The 2nd Image Transfer output current is determined according to the measured value, environment, monochrome/color mode and paper type and width.

ATVC beginning

Cleaning of the 2nd Image Transfer Roller

ATVC current is output to 2nd Image Transfer Roller.

Resistance of the 2nd Image Transfer Roller is measured.

2nd image transfer ATVC current is decided.

High Voltage Unit 2 HV2

ATVC Current

2nd Image Transfer Roller

Transfer Belt

Cleaner Receive Roller

Constant current

Resistance measurements

C4134S038AA

Control Board

PWB-A

C4134S039AA

1-12. Temperature/Humidity Sensor

• The Temperature/Humidity Sensor detects the temperature and humidity inside the printer and adjusts the second image transfer bias potential.

4134M009AA

Temperature/Humidity Sensor (PC21)

Temperature data

Humidity data

4131M029AA

Control Board (PWB-A)

High Pressure Unit 1 (HV1)

2nd Image Transfer Bias

1-13. Transfer Belt Cleaning Mechanism

• The Cleaning Blade scrapes any residual toner off the surface of the Transfer Belt.

• The Cleaning Blade uses a fixed blade method in which the blade is in constant contact with Transfer Belt.

• After the power is turned ON and a predetermined number of copies are printed, the Transfer Belt is turned backward for a predetermined period of time to remove residual toner and paper dust wedged between the Cleaning Blade and Transfer Belt.

Cleaning Blade

Cleaner Receive Roller

Transfer Belt

Driven

4134M046AA

1-14. Cleaning the 2nd Image Transfer Roller

• To remove residual toner from the surface of the 2nd Image Transfer Roller, a reverse bias is output intermittently to the roller.

• The residual toner is moved to the surface of the Transfer Belt, and collected by the Cleaning Blade.

• Cleaning is initiated when the Power Switch is turned ON or Front Door is opened/closed or when jam or trouble returns occur.

2nd Image Transfer Roller

Bias Intercept

Reverse Bias

Bias Contact

Charge Neutralizing Bias

4134M010AB

1-15. Waste Toner Box

• The Cleaning Blade scrapes any residual toner off the surface of the Transfer Belt.

• The residual toner, which has been scraped off by the Cleaning Blade, is conveyed by the conveying screw and collected in the Waste Toner Box.

• The waste toner conveying coil is rotated by the drive transmission of the driven roller.

Waste Toner Conveying Screw

Transfer Belt

4134M039AB

Waste Toner Box

(1) Installing the Waste Toner Box

• If the Waste Toner Box has not been mounted, the front door will not shut.

(2) Waste Toner Near-Full/Full Detection

• For waste toner near-full/full detection, the amount of overlap of Disk Plate 1 attached to the agitating paddle shaft and Disk Plate 2 on the drive gear is detected by the Waste Toner Full Detecting Sensor according to the excess of toner on the agitating paddle inside the Waste Toner Box.

• When there is a small amount of toner, the load to the agitating paddle decreases so the amount of overlap of Disk Plates 1 and 2 decreases and the amount of time the sensor is ON is increased.

• When there is a great deal of toner, the load to the Agitating Paddle increases so the amount of overlap of Disk Plate 1 and 2 increases and the amount of time the sensor is ON is reduced.

Agitating Paddle

Waste Toner Full Detecting Sensor (PC20)

4134M040AA

Cover Plate 1 Cover Plate 2

4134M047AA

1. FUSING SECTION

1-1. Drive of Fuser Unit

• During the image transfer process, the toner is transferred and fused to the paper.

• The Fusing Method is a roll method whereby a heating roller heated by a heater lamp and fusing pressure roller are pressed and by passing paper between them, the toner becomes fused to the paper.

• The heating roller is equipped with two heater lamps, which are switched according to the paper size.

4134M005AB

4134M503AB

1. Heating Roller Thermostat (TS1)

2. Heating Roller Heater Lamp 2 (H2)

3. Heating Roller

4. Fusing Pressure Roller Heater Lamp (H3)

5. Fusing Pressure Roller

6. Heating Roller Thermistor (TH1)

7. Heating Roller Heater Lamp1 (H1)

8. Heater Switching Thermistor (TH3)

9. Fusing Pressure Roller Thermistor (TH2)

10. Fusing Pressure Roller Thermostat (TS2)

1-2. Fuser Unit Drive

• The fusing section is driven by a motor.

Fusing Drive Motor (M3)

Heating Roller

4134M006AC

1-3. Control of Loop Before Fusing

• A loop is formed in front of the fusing roller to maintain the correct paper feed condition between the 2nd Image Transfer Roller and the fusing roller.

• The speed of the fusing Drive Motor is regulated in 2 stages to ensure that a loop is constantly being formed.

• The Loop Correction Detection Sensor switches the speed of the fusing motor.

Heating Roller

Paper

Fusing Pressure Roller

Actuator

Loop Correction Detection Sensor (PC3)

4134M508AA

Second Image Transfer Roller

1-4. New Fuser Unit Detection

• New unit detection is perdormed by energizing to the fuse in the new unit, and fusing.

1-5. Pressure of Fusing Roller

• The Fusing Pressure Roller and the Heating Roller are pressed against each other at all times. They are released for maintenance service or replacement of parts.

• If a paper misfeed occurs in the Fuser Unit, the Fusing Misfeed Clearing Levers are pulled upward to release pressure between the two rollers.

Fusing Misfeed Clearing Levers

Pressure Spring

4134M007AA

1-6. Temperature Control

• Heater lamps are turned ON and OFF to keep the surface temperature of the Fusing Pressure Roller and Heating Roller at predetermined levels.

• The heating roller has two heater lamps with different heat intensity and light distribution, which are switched according to the paper size.

• The surface temperature of the heating roller and the fusing pressure roller is detected by a thermistor and the heater lamps are turned ON or OFF.

• If the surface temperatures of the Fusing Pressure Roller and Heating Roller run inordinately high, power to the heater lamps is shut down.

• When an error occurs, with the exception of “No paper”, “Paper misfeed” or “size error”, the power to the heater lamps is shut down.

(1) Fusing Temperature control flow

• Control is different according to the state of the engine.

Power ON

Emergency Stop Error

Pre-heat Mode Release Command Receipt

Emergency Stop Error

Temperature Control at

Warm-up

Temperature Control during

standby

Pre-heat Mode Start Command Receipt

Pre-heat Mode Temperature

Control

Sleep Start Command Receipt

Heater OFF

Error Release/Power-saving Mode Release Command Receipt

Print Completion

Print receipt

Emergency Stop Error

Temperature Control during

Printing

C4134S040AA

(2) Control at Warm-up

• The temperature is adjusted to the printing temperature and the heating roller and fusing pressure roller are warmed up.

• Warm-up control has two modes based on the temperature of the heating roller when the warm-up is started.

Name

Cold start 100 Less than 100°C

Warm start 100 More than 100°C

Control at cold start

Name

Heating Roller

Fusing Pressure Roller

Control at warm start

Name

Heating Roller

Fusing Pressure Roller

Set Temper-

ature

150°C

150°C – 145°C 150°C

Set

Temperature

150°C

150°C –

Temperature of Heating Roller when

initialize starts

Fusing Motor

Start-up

Conditions

More than

120°C

Fusing Motor

Start-up

Conditions

More than

120°C

Warm-up Completion

Conditions

145°C 150°C

Warm-up Completion

Conditions

After the fusing motor

has been driven for

more than 10 seconds

at more than 145°C.

After the fusing motor

has been driven for

more than10seconds

at more than 145°C.

Fusing Motor Stop

Conditions

Fusing Motor Stop

Conditions

After the fusing motor

has been driven for

more than 10 seconds

at more than 150°C.

After the fusing motor

has been driven for

more than10seconds

at more than 150°C.

(3) Temperature Control During Standby

• During standby, after warm-up or when print is complete, the decline in temperature of the heating roller and the fusing pressure roller is controlled.

Within 30 sec. after warm-up ends

For Standby modes other than in the above situations

Heating Roller

temperature

170°C 170°C

Fusing Pressure Roller

temperature

(4) Temperature Control During Printing

• Temperature control is performed for each roller based on the paper size and number of copies.

Control temperature

(Heating roller/

Heating roller °C)

Paper Size

1st sheet 173/155 180/183 173/155 180/183 2nd through 5th sheets 165/155 170/178 165/155 170/178 6th sheet or beyond 158/155 165/165 158/155 165/165

Control temperature

(Heating roller/

Heating roller °C)

Paper Size –

1st sheet 171/171 173/155 180/165 2nd through 5th sheets 170/170 165/155 170/155 6th sheet or beyond 170/170 158/155 170/155

(5) Pre-heat Mode Control

• The temperature of the heating roller and fusing pressure roller is lowered to reduce the amount of electricity consumed during standby.

• The temperature is controlled so that the appropriate printing temperature is achieved within 30 seconds.

• When the pre-heat completion message is received, the printer moves to standby control mode.

Plain Paper Thick Paper

216 mm or

less

OHP Double sided (plain paper)

More than

216 mm

216 mm or

less

216 mm or

More than

216 mm

less

More than

216 mm

Name Set Temperature Heating Roller 138°C Fusing Pressure

Roller

(6) Sleep Mode

• When the sleep mode start command or power saving start mode command given, the printer goes into this mode.

• Both the heating roller and fusing pressure roller turn OFF to reduce the amount of power consumed.

• When the sleep mode completion or power saving mode completion commands are given, the printer goes into warm-up control.

132°C

(7) Heating heater switch control

• The control begins from Heater 1 when the Power Switch is turned ON.

• This control is continuously performed while the heater is ON.

During

warm-up

Switch to Heater 2

Switch to Heater 1

Print mode One-sided Printing Paper type Plain Paper, Thick Paper Paper width Less than 216 mm More than 216 mm Number of

continuous copies

Switch to Heater 2

Switch to Heater 1

Print mode Two-sided Printing Paper type Plain Paper Paper width Less than 216 mm More than 216 mm Number of

continuous copies

Switch to Heater 2

Switch to Heater 1

Target Control Temperature +15°C

Target Control Temperature-2°C

All sheets 1st sheet After the 2nd sheet

Select only Heater 2

All sheets 1st sheet After the 2nd sheet

Select only Heater 2

Within 30 sec.

after a warm-up cycle

Target Control

Temperature -6°C

Target Control

Temperature -10°C

Target Control

Temperature -6°C

Target Control

Temperature -10°C

Standby

Target Control

Temperature +2°C

Target Control

Temperature-2°C

Target Control

Temperature -10°C

Target Control

Temperature -14°C

Target Control

Temperature -10°C

Target Control

Temperature -14°C

Print mode One-sided Printing Paper type Paper width Continuous

number of copies Switch to

Heater 2 Switch to

Heater 1

OHP

All sheets

Target Control

Temperature +2°C

Target Control

Temperature -2°C

1. PAPER TAKE-UP SECTION

1-1. 1st Drawer

• The 1st drawer holds 250 sheets of plain paper/50 sheets of thick paper, governmentstandard postcards and transparencies, or 10 envelopes.

Paper size for 1st Drawer Length Detecting Board (PWB-PS)

Trailing Edge Guide Plate

(1) Tray set detection

• The shading plate blocks the detection sensor and the machine then determines that the drawer has been slid into position.

Shading Plate

Front/Rear Edge Guide Plate

Paper Take-Up Roller

4134M008AA

1st Drawer Detection Sensor (PC8)

4134M011AA

(2) Paper Size Detection

• The paper size is detected by a combination of four length detection switches and a width detection sensor.

SW1

Sector lever

SW2

SW3

SW4

1st Drawer Paper Length Detection Board (PWB-PS)

Trailing Edge Guide Plate

1st Drawer Paper Width Detection Sensor (PC11)

Actuator

Front/Rear Edge Guide Plate

Paper size

Postcards ON OFF ON OFF ON

A5C ON OFF ON OFF OFF B5C OFF ON OFF ON ON

Letter C OFF OFF ON OFF ON

A4C OFF OFF ON OFF OFF

G.Legal L ON OFF OFF OFF OFF

Legal L ON ON ON OFF OFF

B4L ON ON ON OFF ON

Ledger L ON ON ON ON ON

A3L ONONONON OFF

Oversized L OFF ON ON ON OFF

Length Detecting Switch (PWB-PS)

SW1 SW2 SW3 SW4

4004M028AB

4134M050AB

Size Detecting Sensor (PC11)

(3) Paper Near-empty Detection

• When the number of sheets of paper still available for use reaches a predetermined level, the printer determines that it is a paper-near-empty condition.

Predetermined No. of Sheets

(Paper Level)

Near Empty

50±20 sheets (80 g/m

paper)

Paper NearEmpty Lever

1st Drawer Paper Near-Empty Sensor Empty Detecting Sensor (PC9)

4134M042AB

(4) Paper Empty Detection

• The Paper-empty condition is detected by the Paper Empty Detecting Sensor.

Drawer Paper Empty Sensor Empty Detecting Sensor (PC10)

Paper Empty Lever

4134M043AA

(5) Paper Take-Up Mechanism

• The Paper Take-Up Roller drives the Paper Take-Up Drive Motor via a gear.

• A Paper Separator Roller is used to prevent double feed.

Paper Take-Up Drive Motor (M1)

Paper Take-Up Roller

Separator Roll

4134M012AC

4004M601AA

1-2. 2nd Drawer

• The 2nd Drawer holds up to 500 sheets of plain paper.

• Up to two optional cassettes can be added.

Front/Rear Edge Guide Plate

Trailing Edge Guide Plate

Right Side Door

Paper Lifting Plate

(1) Tray set detection

• When the cassette is slid in, the rib actuates the switch, allowing the machine to determine that the cassette has been slid in position.

Tray Set Switch (SW D)

4658M001AB

4658M010AA

(2) Paper Size Detection

When the cassette slides in, the Front/Rear and Trailing Edge Guide Plates actuate the Paper Size Detection Switch allowing the machine to determine the paper size.

Paper

Size

Ledger L HHHHHHHHHHHL

A3L LHHHHHHHHHHL B4L HLHHHHHHHHHH

Legal L H H L HHHHHHHHH

Letter C HHHHHHHLHHHL

A4C HHHHHHHH L HH L

JIS B5C HHHHHHHHHH L H

✽ ON: L, OFF: H

Trailing Edge Guide Plate

Paper Size Detection Switch 1 (SW A)

FD1 FD2 FD3 FD4 FD5 FD6 FD7 FD8 FD9

Paper Size Detection Switch 2 (SW B)

SW A SW B SW C

FD10FD1

Paper Size Detection Switch 3 (SW C)

Front/Rear Edge Guide Plate

CD1

4658M014AB

(3) Paper Empty Detection

• When the number of sheets of paper still available for use reaches a predetermined level, the printer determines that there is a paper-near-empty condition.

Predetermined No. of Sheets

(Paper Level)

Near Empty

80 ± 30sheets (80 g/m

paper)

Paper Near-Empty Sensor (PC103)

Paper Lifting Plate

4134M049AB

(4) Paper Empty Detection

• The paper empty condition is detected by the Paper Empty Sensor.

Paper Empty Sensor (PC102)

4658M012AA

Paper Lifting Plate

4134M516AA

4658M0505AA

(5) Paper Take-Up Mechanism

• The Paper Take-Up Roller Motor drives the Paper Take-Up Roller via the Paper Take-Up Clutch.

Paper Take-up Clutch (CL101)

Paper Take-Up Roller

Paper Take-up Motor (M101)

(6) Vertical Transport Mechanism

• The Paper Take-Up Motor provides the drive for the Vertical Transport Roller.

Paper Take-Up Motor (M101)

Separator Roller

Vertica l Transport Roller

4658M006AB

4658M005AB

(7) Edge Guides and Trailing Edge Stop

• The Trailing Edge Stop can be removed and reinstalled to the specified position corresponding to the size of the paper to be loaded.

• The Edge Guides can be slid to the exact size of the paper to be loaded.

Trailing Edge Guide Plate Front/Rear Edge Guide Plate

4658M007AA

4658M008AA

(8) Paper Lifting Plate

• The Paper Lifting Plate is locked into position when it is pressed down. It is unlocked when the drawer is slid into the unit.

• The Paper Lifting Plate is pushed upward by the Paper Lifting Springs at all times.

Spring

Paper Lifting Plate

4004M009AB

1-3. Manual Feed Tray (Optional)

• Paper can be fed manually one sheet at a time.

• The Manual Feed Paper Take-Up Drive Motor provides the drive for the Manual Feed Drive Roller.

(1) Manual Feed Paper Take-Up Mechanism

Manual Feed Paper TakeUp Drive Motor (M101)

Manual Feed Driven Roller

Manual Feed Paper Take-Up Sensor

Manual Feed Drive Roller

(2) Manual feed operation

• When paper is set, the sensor on Manual Feed Detecting Board is turned on.

• The Manual Feed Motor rotates, transports paper 15 mm, and goes into Standby mode.

• Paper is supplied to the main unit from the print request issued by the Controller.

4134M013AB

1. TRANSPORT SECTION

• The Synchronizing Rollers synchronizes the image transfer function (2nd Image Transfer) with paper transport.

1-1. Synchronizing Roller Drive

• The Synchronizing Roller provides the drive for the Transport Drive Motor.

Transport Drive Motor

Synchronizing Driven Roller

4134M014AB

1-2. Image Transfer Failure Prevention During High Humidity

• When humidity is high and the paper in the printer gets damp, the charge from the image transfer charger passes through the paper and the Synchronizing Roller, drops into the frame ground, and Image Transfer Failure (low density image) occurs.

• A High Resistance Board is placed between the Synchronizing Driven Roller and the frame ground to prevent the flow of image transfer voltage.

Synchronizing Driven Roller

High Resistance Board (PWB-R)

4134M015AA

1-3. Switch of system speed

• The system speed is switched according to the type of paper.

Paper Type System speed

Plain Paper 90 mm/s

Thick paper, OHP, envelopes, postcards,

labels

45 mm/s

1-4. OHP Detecting

• OHP Detecting is performed by the OHP Detecting Sensor.

• Determines whether the paper type set and the OHP detection result match. It becomes a media error when they do not match.

• When a media error is detected, printing does not occur and the paper is fed out of the printer.

OHP detection sensor detection section

OHP Detection Sensor (PC1): prism portion

4134M016AA

1. DUPLEX UNIT (OPTIONAL) 1-1. Drive of Duplex Unit

• The paper has a printed image on one side is temporarily fed toward the Exit Tray and, as soon as the trailing edge of the paper moves past the guide plate in front of the Exit Roller, the Exit Roller is turned backward so that the paper is fed into the Duplex Unit.

• Drive for the Exit Roller is disconnected from the printer when the Duplex Unit is mounted on the machine and, instead, it is provided by the Duplex Unit Turnover Motor of the Duplex Unit.

• The Transport Rollers of the Duplex Unit are driven by the Manual Bypass Paper TakeUp Drive Motor.

• The paper is transported to the printer by the Transport Rollers.

Transport Rollers 1

Duplex Unit Drive Motor (M10)

Transport Rollers 2

Transport Rollers 3

4134M017AA

1-2. Paper Feeding System

(1) Operations in 2-sided printing with a single sheet of paper resident in, and cir-

culated through, the system

1. Paper is taken up and fed in and the image on page 2 of the original is printed.

4657M521AA

2. Paper is first transported to the exit portion and the paper is then switched back.

4657M522AA

4657M523AA

3. The 1-sided copy moves through the Duplex Unit and is directly subject to the second copy cycle without stopping.

4. The image on page 1 of the original is printed on the paper that is taken up from the Duplex Unit.

1 2

4657M524AA

5. The first page is fed out of the printer.

✽ Steps from (2) to (5) are then repeated.

(2) Operations for 2-sided printing with two sheets of paper resident in the system,

and with a new sheet of paper taken up when a printed page with images printed on both sides is fed out.

4657M525AA

1. The first sheet of paper is taken up and fed in and the image on page 2 of the original is printed.

4657M515AA

2. The paper is switched back in the paper exit section.

4657M516AA

3. At the same time, the 2nd sheet of paper is taken up and fed in.

4. The image on page 4 of the original is printed on the 2nd sheet of paper.

4657M517AA

5. The 1st sheet of paper moves through the Duplex Unit and is directly subject to the second copy cycle without stopping.

6. The image on page 1 of the original is printed on the 1st sheet of paper that is re-fed.

7. The second sheet of paper is switched back and

142

fed into the duplex unit.

8. At the same time, the 3rd sheet of paper is taken up and fed in.

4330M501AA

9. At the same time, the 1st sheet of paper is fed out of the machine, the image on page 6 is printed on

2 1

the 3rd sheet of paper.

10. The 2nd sheet of paper stops in the Duplex Unit.

6 4

4330M502AA

11. The 3rd sheet of paper is switched back in the paper exit area.

6 2 1

4330M503AA

12. At the same time, the 2nd sheet of paper is directly subject to the second copy cycle.

13. The image on page 3 of the original is printed on the 2nd sheet of paper.

2 1

364

14. The 3rd sheet of paper is stopped in the Duplex Unit.

15. At the same time, the 4th sheet of paper is taken up and fed in.

4330M504AA

16. At the same time, the 2nd sheet of paper is fed

4 3

out of the machine, the image on page 8 is printed on the 4th sheet of paper.

17. The 3rd sheet of paper stops in the Duplex Unit.

2 1

4330M505AA

MAINTENANCE

100

Minolta mc7300 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1. SAFETY PRECAUTIONS FOR INSPECTION AND SERVICE

CONTENTS

GENERAL

1. SPECIFICATIONS

2. PRECAUTIONS FOR INSTALLATION

3. PRECAUTIONS FOR USE

4. HANDLING CONSUMABLES

5. LIST OF NAMES

1. CROSS-SECTION VIEW

2. ELECTRICAL PARTS LAYOUT

3. OPERATING SEQUENCE

1. IMAGE STABILIZATION CONTROL

1. PRINT HEAD (PH)

1. PRINT UNIT

1. IMAGE TRANSFER SECTION

1. FUSING SECTION

1. PAPER TAKE-UP SECTION

1. TRANSPORT SECTION

1. DUPLEX UNIT (OPTIONAL) 1-1. Drive of Duplex Unit

MAINTENANCE