SERVICE MANUALMULTIFUNCTIONAL DIGITAL COLOR SYSTEMS

e-STUDIO5520C/6520C/6530C

Model: FC-5520C/6520C/6530CPublish Date: August 2008File No. SME070016K0R070921E4700-TTECVer11_2012-03

Trademarks The official name of Windows 95 is Microsoft Windows 95 Operating System. The official name of Windows 98 is Microsoft Windows 98 Operating System. The official name of Windows Me is Microsoft Windows Millennium Edition Operating System. The official name of Windows 2000 is Microsoft Windows 2000 Operating System. The official name of Windows XP is Microsoft Windows XP Operating System. Microsoft, Windows, Windows NT, Windows Vista and the brand names and product names of other

Microsoft products are trademarks or registered trademarks of Microsoft Corporation in the U.S. and/or other countries.

Apple, AppleTalk, Macintosh, and Mac are trademarks of Apple Computer, Inc. in the U.S. and other countries.

PostScript is a trademark of Adobe Systems Incorporated. NOVELL, NetWare, and NDS are trademarks or registered trademarks of Novell, Inc. FLOIL is a registrated trademark of Kanto Kasei Ltd. CORPORATION. Mylar is a registered trademark of DuPont Teijin Films U.S. Limited Partnership. Molykote is a registered trademark of Dow Corning Corporation. Other company names and product names in this manual are the trademarks of their respective

companies.

2008-2012 TOSHIBA TEC CORPORATION All rights reserved

Under the copyright laws, this manual cannot be reproduced in any form without prior written permission of TOSHIBA TEC CORPORATION.

GENERAL PRECAUTIONS REGARDING THE SERVICE FOR e-STUDIO5520C/6520C/6530C

The installation and service should be done by a qualified service technician.

1. Transportation/Installation- When transporting/installing the equipment, employ four persons and be sure to move it by the

casters while lifting the stoppers.The equipment is quite heavy and weighs approximately 245 kg (540.12 lb) or 246 kg (542.33 lb), therefore pay full attention when handling it.

- Be sure not to hold the movable parts or units (e.g. the control panel, ADU or RADF) when transporting the equipment.

- It is recommended to plug two power cables into two separate outlets. Be sure to use a dedicated outlet with AC 115 V / 20 A , 127 V / 20 A , 220-240 V / 10 A , 220-240 V / 13 A

- Be sure not to touch high-voltage sections such as the chargers, transfer belt, 2nd transfer roller, developer, high-voltage transformer, exposure lamp control inverter, inverter for the LCD backlight and power supply unit. Especially, the board of these components should not be touched since the electric charge may remain in the capacitors, etc. on them even after the power is turned OFF.

- Make sure that the equipment will not operate before touching potentially dangerous places (e.g. rotating/operating sections such as gears, belts pulleys, fans and laser beam exit of the laser optical unit).

- Be careful when removing the covers since there might be the parts with very sharp edges underneath.

- When servicing the equipment with the power turned ON, be sure not to touch live sections and rotating/operating sections. Avoid exposing your eyes to laser beam.

- Use designated jigs and tools.- Use recommended measuring instruments or equivalents.- Return the equipment to the original state and check the operation when the service is finished.- Be very careful to treat the touch panel gently and never hit it. Breaking the surface could cause

malfunctions.

3. Important Service Parts for Safety- The breaker, door switch, fuse, thermostat, thermofuse, thermistor, batteries, IC-RAMs including

lithium batteries, etc. are particularly important for safety. Be sure to handle/install them properly. If these parts are short-circuited and their functions become ineffective, they may result in fatal accidents such as burnout. Do not allow a short-circuit or do not use the parts not recommended by Toshiba TEC Corporation.

4. Cautionary Labels- During servicing, be sure to check the rating plate and cautionary labels such as Unplug the

power cable during service, CAUTION. HOT, CAUTION. HIGH VOLTAGE, CAUTION. LASER BEAM, etc. to see if there is any dirt on their surface and if they are properly stuck to the equipment.

Warning for high temperature area (Bridge unit)

For U.S.A. and Canada

For EU

Explanatory label

Identification label

Warning for grounding wire

Warning for high temperature area (Fuser unit)

Warning for high temperature area(Duplexing unit / Fuser unit)

Certification label (For U.S.A. and Canada)

5. Disposal of the Equipment, Supplies, Packing Materials, Used Batteries and IC-RAMs- Regarding the recovery and disposal of the equipment, supplies, packing materials, used

batteries and IC-RAMs including lithium batteries, follow the relevant local regulations or rules.

6. When the option has been installed:When the EFI printer board has been installed, be sure to unplug the power cable before performing maintenance and inspection, otherwise troubles such as a communication error may occur.

Caution:Dispose of used batteries and IC-RAMs including lithium batteries according to this manual.

Attention:Se dbarrasser de batteries et IC-RAMs uss y compris les batteries en lithium selon ce manuel.

Vorsicht:Entsorgung der gebrauchten Batterien und IC-RAMs (inclusive der Lithium-Batterie) nach diesem Handbuch.

1. Precautions for Transporting Equipment Once Unpacked

1 General DescriptionIt is recommended to follow the procedure below when you transport equipment that has already been unpacked but has not been packed again. Note that the following procedure cannot guarantee the operation of the transported equipment.

Remarks: Keep packing material removed at unpacking to reuse it in steps (2) and (3) above.

Use a service jig PLATE-TONER-SEAL-4P (6LH035950, 4 pieces in 1 set) as sealing material to be used in step (4) above.

Do not install the accessories shown below when unpacking the equipment.

Item Content(1) Gasket in Reversing Automatic

Document Feeder (RADF)Check that gaskets are not installed in the RADF.(If they are installed, remove them.)

(2) Scanning section Fix the scanning section.(3) Drum Install a drum protection sheet.(4) Toner Install sealing material on the toner supply opening of each

toner cartridge.

2 Precautions and Procedures for Transporting Equipment

2.1 Checking gaskets in the RADFThe installation of gaskets to the RADF, which is described in the Unpacking Instructions, must not be performed when the equipment is unpacked but must be when it is reinstalled at a users office. Do not install the gaskets in the equipment before transporting it because if it is transported with the gaskets installed, the screws fixing the scanner may contact with the gaskets and thus damage them.

2.2 Fixing the scanning section1. Move carriage-1 until it touches the left side of the frame. Then move it back to the right for 3

mm. Note:

Rotate a drive pulley by hand to move carriage-1. P.7-18 "7.6 Disassembly and Replacement"

2. Reinstall 5 screws that were removed when unpacking the equipment.

Notes: The installation of materials for covering the holes of the scanner fixing screws (e.g. rubber

cap, blind seal), which is described in the Unpacking Instructions, must not be performed when the equipment is unpacked but must be when it is reinstalled at a user's office.

The installation of grounding screws in the RADF, which is described in the Unpacking Instructions, must not be performed when the equipment is unpacked but must be when it is reinstalled at a users office. Install them after you have removed the screws reinstalled in step (2).

2.3 Installing a drum protection sheet1. Pull out the EPU tray. P.11-24 "11.5 Disassembly and Replacement"

2. Install a drum protection sheet on the K drum.

3. Push the EPU tray in, and then reassemble the equipment in the procedure reverse to disassembly.

Notes: It is recommended to keep the drum protection sheet removed at unpacking. Store the drum protection sheet in a place without high temperature and humidity, direct

sunlight or dust. Do not scratch or bend the drum protection sheet. Avoid adhesion of dust, dirt or foreign

matter, especially things that may damage the surface of the drums or the transfer belt (e.g. hard matter or matter that is highly adhesive, organic or chemical matter, grease) to the drum protection sheet.

Do not use a drum protection sheet that is damaged or deformed, or one with any abnormality.

2.4 Installing the sealing material in toner supply opening1. Open the front cover and then take off the toner cartridges (Y, M, C and K).

Note: The toner cartridges must not be installed while the equipment is being transported. Pack them separately from the equipment.

2. Install PLATE-TONER-SEAL-4P (6LH035950) in the toner supply opening of each toner cartridge. Then close the front cover.

Notes: Pay attention to prevent dust from entering into the toner supply openings. When installing PLATE-TONER-SEAL-4P (6LH035950), be careful not to scratch or remove

the sponge that is already attached to the toner supply openings.

KCMY

ALLEGEMEINE SICHERHEITSMASSNAHMEN IN BEZUG AUF DIE WARTUNG FR e-STUDIO5520C/6520C/6530C

Die Installation und die Wartung sind von einem qualifizierten Service-Techniker durchzufhren.

1. Transport/Installation- Zum Transportieren/Installieren des Gertes werden 4 Personen bentigt. Bewegen Sie es mit

den Rollen, whrend Sie die Absperrvorrichtungen heben. Das Gert ist sehr schwer und wiegt etwa 245 kg oder 246 kg; deshalb muss bei der Handhabung des Gerts besonders aufgepasst werden

- Beim Transportieren des Gerts nicht an den beweglichen Teilen oder Einheiten (z.B. das Bedienungsfeld, die Duplexeinheit oder die automatische Dokumentenzufhrung) halten.

- Es empfiehlt sich, zwei Stromkabel in zwei getrennten Steckdosen einzustecken. Eine spezielle Steckdose mit Stromversorgung von AC 115 V / 20 A (fr NAC/NAD), 220-240 V / 10 A (fr ASU, ASD, ARD, AUC/AUD, CND), 220-240 V /13 A (fr MJC/MJD) als Stromquelle verwenden. Mindestens eine 20A-Steckdose verwenden, wenn zwei Stromkabel in der selben Steckdose eingesteckt werden sollen.

- Das Gert ist aus Sicherheitsgrnden zu erden.- Einen geeigneten Standort fr die Installation whlen. Standorte mit zuviel Hitze, hoher

Luftfeuchtigkeit, Staub, Vibrieren und direkter Sonneneinstrahlung sind zu vermeiden.- Fr ausreichende Belftung sorgen, da das Gert etwas Ozon abgibt.- Um einen optimalen Kopierbetrieb zu gewhrleisten, muss ein Abstand von mindestens 80 cm

links, 80 cm rechts und 10 cm dahinter eingehalten werden.- Das Gert ist in der Nhe der Steckdose zu installieren; diese muss leicht zu erreichen sein.- Nach der Installation muss das Netzkabel richtig hineingesteckt und befestigt werden, damit

niemand darber stolpern kann.- Falls der Auspackungsstandort und der Installationsstandort des Gerts verschieden sind, die

Bildqualittsjustierung (automatische Gammajustierung) je nach der Temperatur und Luftfeuchtigkeit des Installationsstandorts und der Papiersorte, die verwendet wird, durchfhren.

- Wenn das Gert nach der Entfernung der Extras verwendet wird, die entfernten Teile oder Abdeckungen anbringen, damit das Innere des Gert nicht freiliegt.

2. Allgemeine Sicherheitsmassnahmen in bezug auf die Wartung- Whrend der Wartung das Gert ausschalten und das Netzkabel herausziehen (ausser Wartung,

die bei einem eingeschalteten Gert, durchgefhrt werden muss).- Das Netzkabel herausziehen und den Bereich um die Steckerpole und die Steckdose die

Umgebung in der Nhe von den Steckerzacken und der Steckdose wenigstens einmal im Jahr reinigen. Wenn Staub sich in dieser Gegend ansammelt, kann dies ein Feuer verursachen.

- Wenn die Teile auseinandergenommen werden, wenn nicht anders in diesem Handbuch usw erklrt, ist das Zusammenbauen in umgekehrter Reihenfolge durchzufhren. Aufpassen, dass kleine Teile wie Schrauben, Dichtungsringe, Bolzen, E-Ringe, Stern-Dichtungsringe, Kabelbume nicht an den verkehrten Stellen eingebaut werden.

- Grundstzlich darf das Gert mit enfernten oder auseinandergenommenen Teilen nicht in Betrieb genommen werden.

- Das PC-Board muss in einer Anti-elektrostatischen Hlle gelagert werden. Nur Mit einer Manschette bei Bettigung eines Armbandes anfassen, sonst knnte es sein, dass die integrierten Schaltkreise durch statische Elektrizitt beschdigt werden.

- Setzen Sie sich whrend der Wartungsarbeiten nicht dem Laserstrahl aus. Dieses Gert ist mit einer Laserdiode ausgestattet. Es ist unbedingt zu vermeiden, direkt in den Laserstrahl zu blicken. Keine reflektierenden Teile oder Werkzeuge, wie z. B. Schraubendreher, in den Pfad des Laserstrahls halten. Vor den Wartungsarbeiten smtliche reflektierenden Metallgegenstnde, wie Uhren, Ringe usw., entfernen.

- Auf keinen Fall Hochtemperaturbereiche, wie die Belichtungslampe, die Fixiereinheit, die Heizquelle und die umliegenden Bereiche, berhren.

- Auf keinen Fall Hochspannungsbereiche, wie die Ladeeinheiten, das Transferband, die zweite Transferwalze, die Entwicklereinheit, den Hochspannungstransformator, den Steuerumrichter fr die Belichtungslampe, den Umrichter fr die LCD-Hintergrundbeleuchtung und das Netzgert, berhren. Insbesondere sollten die Platinen dieser Komponenten nicht berhrt werden, da die Kondensatoren usw. auch nach dem Ausschalten des Gerts noch elektrisch geladen sein knnen.

- Vor dem Berhren potenziell gefhrlicher Bereiche (z. B. drehbare oder betriebsrelevante Bereiche, wie Zahnrder, Riemen, Riemenscheiben, Lfter und die Laseraustrittsffnung der optischen Lasereinheit) sicherstellen, dass das Gert sich nicht bedienen lsst.

- Beim Entfernen von Abdeckungen vorsichtig vorgehen, da sich darunter scharfkantige Komponenten befinden knnen.

- Bei Wartungsarbeiten am eingeschalteten Gert drfen keine unter Strom stehenden, drehbaren oder betriebsrelevanten Bereiche berhrt werden. Nicht direkt in den Laserstrahl blicken.

- Ausschlielich vorgesehene Werkzeuge und Hilfsmittel verwenden.- Empfohlene oder gleichwertige Messgerte verwenden.- Nach Abschluss der Wartungsarbeiten das Gert in den ursprnglichen Zustand zurck

versetzen und den einwandfreien Betrieb berprfen.- Das berhrungsempfindliche Bedienungsfeld stets vorsichtig handhaben und keinen Sten

aussetzen. Wenn die Oberflche beschdigt wird, kann dies zu Funktionsstrungen fhren.

3. Sicherheitsrelevante Wartungsteile- Der Leistungsschutzschalter, der Trschalter, die Sicherung, der Thermostat, die

Thermosicherung, der Thermistor, die IC-RAMs einschlielich der Lithium-Batterie sind besonders sicherheitsrelevant. Sie mssen unbedingt korrekt gehandhabt und installiert werden. Wenn diese Teile kurzgeschlossen und funktionsunfhig werden, kann dies zu schwerwiegenden Schden, wie einem Abbrand, fhren. Kurzschlsse sind zu vermeiden, und es sind ausschlielich Teile zu verwenden, die von der Toshiba TEC Corporation empfohlen sind.

Vorsicht: Vor Benutzung der Manschette der Bettigung des Armbandes, das Netzkabel des Gertes herausziehen und prfen, dass es in der Nhe keine geladenen Gegenstnde, die nicht isoliert sind, gibt.

4. Warnetiketten- Im Rahmen der Wartung unbedingt das Leistungsschild und die Etiketten mit Warnhinweisen

berprfen, um sicherzustellen, dass sie nicht verschmutzt sind und korrekt am Gert angebracht sind.

1) Erkennungsetikett2) Erklrungsetikett3) Klassifizierungsetikett4) Warnung fr Erdungskabel5) Warnung fr Bereiche mit hhen Temperaturen (Duplexeinheit / Fixiereinheit)6) Warnung fr Bereiche mit hhen Temperaturen (Fixiereinheit)7) Warnung fr Bereiche mit hhen Temperaturen (Brckeneinheit)

5. Entsorgung des Gerts, der Verbrauchs- und Verpackungsmaterialien, alter Akkus und IC-RAMs- In Bezug auf die Entsorgung und Wiederverwertung des Gerts, der Verbrauchs- und

Verpackungsmaterialien, alter Akkus und IC-RAMs, einschlielich Lithiumakkus, sind die einschlgigen nationalen oder regionalen Vorschriften zu befolgen.

[1]

[2]

[4]

[5]

[6]

[7]

[3]

Caution:Dispose of used batteries and IC-RAMs including lithium batteries according to this manual.

Attention:Se dbarrasser de batteries et IC-RAMs uss y compris les batteries en lithium selon ce manuel.

Vorsicht:Entsorgung der gebrauchten Batterien und IC-RAMs (inclusive der Lithium-Batterie) nach diesem Handbuch.

Laseremissionseinheit

Diese Einheit besteht aus der Laserdiode, dem Fokussierungsobjektiv, der Blende und dem Zylinderobjektiv.

LaserdiodeDiese Laserdiode zeichnet sich durch eine geringe Regeldifferenz, eine kleine Laservariation und einen niedrigen Schwellenstrom aus.Die Blende der Laseremissionseinheit ist unter dem Fokussierobjektiv angeordnet, um die Form der Laserstrahlen in der primren und sekundren Scanrichtung festzulegen.Die Laserdiode gibt Laserstrahlen als Reaktion auf die Signale der Laseremissionssteuerung (ein/aus) von der Lasertreiber-PC-Platine (LDR) aus. Die durch das Fokussierobjektiv gefhrten Laserstrahlen werden auf die Trommeloberflche fokussiert.

Vorsichtsmanahmen im Zusammenhang mit LasernDieses Gert enthlt eine Laserdiode, die einen unsichtbaren Laserstrahl emittiert.Da man diesen Laserstrahl nicht sehen kann, ist bei der Handhabung der Komponenten der optischen Lasereinheit, bei der Durchfhrung von Arbeiten und bei der Justierung des Laserstrahls uerste Vorsicht geboten. Arbeiten drfen niemals anhand anderer als den vorgeschriebenen Anleitungen durchgefhrt werden; andernfalls kann es zu einer Schdigung Exposition durch Laserstrahlung kommen.Die Lasereinheit ist vollstndig mit einer Schutzabdeckung versiegelt. Solange ausschlielich die Arbeitsschritte der vorgeschriebenen Anleitungen durchgefhrt werden, tritt der Laserstrahl nicht aus, und es besteht keine Gefahr, der Laserstrahlung ausgesetzt zu werden.

Das folgende Laser-Warnetikett ist an der Abdeckung vorne rechts angebracht.

Warnhinweise:Setzen Sie sich whrend der Wartungsarbeiten nicht dem Laserstrahl aus.Dieses Gert ist mit einer Laserdiode ausgestattet. Es ist unbedingt zu vermeiden, direkt in den Laserstrahl zu blicken. Keine reflektierenden Teile oder Werkzeuge, wie z. B. Schraubendreher, in den Pfad des Laserstrahls halten. Vor den Wartungsarbeiten smtliche reflektierenden Metallgegenstnde, wie Uhren, Ringe usw., entfernen.Bei Wartungsarbeiten am eingeschalteten Gert drfen keine unter Strom stehenden, drehbaren oder betriebsrelevanten Bereiche berhrt werden. Nicht direkt in den Laserstrahl blicken.Im Rahmen der Wartung unbedingt das Leistungsschild und die Etiketten mit Warnhinweisen berprfen [z. B. Unplug the power cable during service (Netzkabel vor Beginn der Wartungsarbeiten abziehen), CAUTION. HOT (VORSICHT, HEISS), CAUTION. HIGH VOLTAGE (VORSICHT, HOCHSPANNUNG), CAUTION. LASER BEAM (VORSICHT, LASER) usw.], um sicherzustellen, dass sie nicht verschmutzt sind und korrekt am Gert angebracht sind.

2008-2012 TOSHIBA TEC CORPORATION All rights reserved e-STUDIO5520C/6520C/6530CCONTENTS

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CONTENTS

1. FEATURE...................................................................................................................... 1-11.1 Main Feature of e-STUDIO5520C/6520C/6530C ............................................................. 1-1

2. SPECIFICATIONS/ACCESSORIES/OPTIONS/SUPPLIES ......................................... 2-12.1 Specifications .................................................................................................................... 2-1

2.1.1 General .............................................................................................................. 2-12.1.2 Copy .................................................................................................................. 2-32.1.3 Print ................................................................................................................... 2-82.1.4 Scan................................................................................................................... 2-82.1.5 e-Filing ............................................................................................................... 2-82.1.6 Internet Fax........................................................................................................ 2-92.1.7 Network Fax....................................................................................................... 2-9

2.2 Accessories..................................................................................................................... 2-102.3 Options............................................................................................................................ 2-112.4 Supplies .......................................................................................................................... 2-122.5 System List...................................................................................................................... 2-13

3. OUTLINE OF THE MACHINE ....................................................................................... 3-13.1 Sectional View................................................................................................................... 3-1

3.1.1 Front side........................................................................................................... 3-13.1.2 Rear side ........................................................................................................... 3-2

3.2 Electric Parts Layout ......................................................................................................... 3-33.3 Symbols and Functions of Various Components ............................................................ 3-27

3.3.1 Motors.............................................................................................................. 3-273.3.2 Fans................................................................................................................. 3-293.3.3 Sensors............................................................................................................ 3-303.3.4 Switches .......................................................................................................... 3-353.3.5 Electromagnetic spring clutches ...................................................................... 3-353.3.6 Solenoids ......................................................................................................... 3-363.3.7 PC boards........................................................................................................ 3-373.3.8 Lamps, coils, and heaters................................................................................ 3-383.3.9 Thermistors, thermopiles, and thermostats ..................................................... 3-383.3.10 Transformer ..................................................................................................... 3-393.3.11 Others .............................................................................................................. 3-39

3.4 System Block Diagram.................................................................................................... 3-403.5 Disassembly and Replacement of Covers ...................................................................... 3-41

3.5.1 Front lower cover ............................................................................................. 3-413.5.2 Front cover....................................................................................................... 3-413.5.3 Top right cover................................................................................................. 3-413.5.4 Right top cover................................................................................................. 3-423.5.5 Top front cover................................................................................................. 3-423.5.6 Top left cover ................................................................................................... 3-423.5.7 FAX cover ........................................................................................................ 3-433.5.8 Receiving tray .................................................................................................. 3-433.5.9 Left middle cover ............................................................................................. 3-433.5.10 Left top cover ................................................................................................... 3-443.5.11 Left lower cover ............................................................................................... 3-443.5.12 Bypass tray unit (Removing tray arm) ............................................................. 3-443.5.13 Duplexing unit front cover ................................................................................ 3-453.5.14 Duplexing unit rear cover................................................................................. 3-453.5.15 Paper feed cover ............................................................................................. 3-453.5.16 RADF connector cover .................................................................................... 3-463.5.17 Right rear cover ............................................................................................... 3-463.5.18 Rear cover ....................................................................................................... 3-463.5.19 Upper exhaust fan cover.................................................................................. 3-473.5.20 Top rear cover ................................................................................................. 3-47

e-STUDIO5520C/6520C/6530C 2008-2012 TOSHIBA TEC CORPORATION All rights reservedCONTENTS

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3.5.21 Left corner cover.............................................................................................. 3-473.5.22 Right corner cover ........................................................................................... 3-48

4. COPY PROCESS .......................................................................................................... 4-14.1 General Description .......................................................................................................... 4-1

4.1.1 Expression of Colors.......................................................................................... 4-14.1.2 4-Step Copy Process......................................................................................... 4-2

4.2 Description of Operation ................................................................................................... 4-34.3 Functions........................................................................................................................... 4-44.4 Comparison with e-STUDIO2500C/3500C/3510C.......................................................... 4-12

5. GENERAL OPERATION............................................................................................... 5-15.1 Overview of Operation ...................................................................................................... 5-15.2 Description of Operation ................................................................................................... 5-2

5.2.1 Warming-up ....................................................................................................... 5-25.2.2 Ready (ready for copying) ................................................................................. 5-35.2.3 Drawer feed copying (1st drawer paper feeding)............................................... 5-35.2.4 Bypass feed copying.......................................................................................... 5-95.2.5 Interruption copying ........................................................................................... 5-9

5.3 Detection of Abnormality ................................................................................................. 5-105.3.1 Types of abnormality ....................................................................................... 5-105.3.2 Description of abnormality ............................................................................... 5-10

5.4 Flow Chart....................................................................................................................... 5-155.4.1 Power ON to ready .......................................................................................... 5-155.4.2 Automatic feed copying ................................................................................... 5-17

6. CONTROL PANEL........................................................................................................ 6-16.1 General Description .......................................................................................................... 6-16.2 Items Shown on the Display Panel ................................................................................... 6-2

6.2.1 Display ............................................................................................................... 6-26.2.2 Message ............................................................................................................ 6-3

6.3 Relation between the Equipment State and Operators Operation ................................... 6-86.4 Description of Operation ................................................................................................. 6-10

6.4.1 Dot matrix LCD circuit ...................................................................................... 6-106.4.2 LED display circuit ........................................................................................... 6-12

6.5 Disassembly and Replacement....................................................................................... 6-136.5.1 Control panel unit ............................................................................................ 6-136.5.2 Control panel rear cover ................................................................................. 6-146.5.3 Display PC board (DSP) .................................................................................. 6-146.5.4 Panel inverter board (P-INV) .......................................................................... 6-156.5.5 Shielding plate ................................................................................................. 6-166.5.6 Key PC board-1 (KEY1) .................................................................................. 6-186.5.7 Key PC board-2 (KEY2) .................................................................................. 6-186.5.8 Touch panel (TCP) .......................................................................................... 6-186.5.9 Control panel cover.......................................................................................... 6-19

7. SCANNER ..................................................................................................................... 7-17.1 General Description .......................................................................................................... 7-17.2 Construction ...................................................................................................................... 7-27.3 Functions........................................................................................................................... 7-37.4 Description of Operation ................................................................................................... 7-6

7.4.1 Scanning operation............................................................................................ 7-67.4.2 Initialization at power-ON................................................................................... 7-7

7.5 Electric Circuit Description ................................................................................................7-87.5.1 Scan motor control circuit .................................................................................. 7-87.5.2 Exposure Lamp Control Circuit .......................................................................... 7-97.5.3 General Description of CCD Control................................................................ 7-127.5.4 Automatic Original Size Detection Circuit ........................................................ 7-13

7.6 Disassembly and Replacement....................................................................................... 7-187.6.1 Original glass ................................................................................................... 7-18

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7.6.2 Lens cover ....................................................................................................... 7-197.6.3 SLG board cooling fan (F1) ............................................................................. 7-197.6.4 Automatic original detection sensor (S1-5).............................. 7-207.6.5 Exposure lamp (EXP) ...................................................................................... 7-227.6.6 Exposure lamp cooling fan-1 (F2).................................................................... 7-237.6.7 Scanner unit cooling fan-1 (F3) ....................................................................... 7-247.6.8 Exposure lamp cooling fan-2 (F26).................................................................. 7-267.6.9 Upper exhaust fan (left) (F29).......................................................................... 7-277.6.10 Upper exhaust fan (right) (F30) ....................................................................... 7-287.6.11 Lens unit .......................................................................................................... 7-297.6.12 Scan motor (M1) .............................................................................................. 7-307.6.13 Carriage-1........................................................................................................ 7-317.6.14 Inverter board (INV) ......................................................................................... 7-337.6.15 Carriage wire / carriage-2 ................................................................................ 7-347.6.16 Carriage home position sensor (S6) ................................................................ 7-377.6.17 Platen sensor (S7) ........................................................................................... 7-377.6.18 SLG board (SLG)............................................................................................. 7-37

7.7 Adjustment of the Scanner Section................................................................................. 7-387.7.1 Adjustment carriages-1 and -2 positions ......................................................... 7-387.7.2 Belt tension adjustment of the Scan motor ...................................................... 7-39

8. IMAGE PROCESSING .................................................................................................. 8-18.1 General Description .......................................................................................................... 8-18.2 Configuration..................................................................................................................... 8-28.3 Image Processing PC Board (IMG)................................................................................... 8-3

8.3.1 Features............................................................................................................. 8-38.3.2 Functions of image processing circuit................................................................ 8-3

8.4 System Control PC Board (SYS) ...................................................................................... 8-88.4.1 Features............................................................................................................. 8-88.4.2 Functions of image processing circuit................................................................ 8-8

8.5 Image Related Adjustment................................................................................................ 8-98.5.1 Adjustment Order............................................................................................... 8-98.5.2 Adjustment of the Auto-Toner Sensor ............................................................. 8-108.5.3 Performing Image Quality Control (IQC).......................................................... 8-128.5.4 Adjustment of Color Registration Control ........................................................ 8-148.5.5 Image Dimensional Adjustment (General description) .................................... 8-158.5.6 Paper alignment at the registration roller......................................................... 8-178.5.7 Printer-related image dimensional adjustment ................................................ 8-238.5.8 Scanner-related image dimensional adjustment.............................................. 8-31

8.6 Image Quality Adjustment (Copying Function)................................................................ 8-408.6.1 Automatic gamma adjustment ......................................................................... 8-408.6.2 Density adjustment .......................................................................................... 8-428.6.3 Color balance adjustment ................................................................................ 8-438.6.4 Gamma balance adjustment............................................................................ 8-458.6.5 Background adjustment ................................................................................... 8-468.6.6 Judgment threshold for ACS (common for copy & network scan) ................... 8-478.6.7 Sharpness adjustment ..................................................................................... 8-478.6.8 Setting range correction................................................................................... 8-488.6.9 Adjustment of smudged/faint text .................................................................... 8-498.6.10 Color Adjustment of Marker ............................................................................. 8-498.6.11 Beam level conversion setting ......................................................................... 8-508.6.12 Maximum toner density adjustment to paper type ........................................... 8-518.6.13 Maximum text density adjustment ................................................................... 8-518.6.14 Text/Photo reproduction level adjustment ....................................................... 8-528.6.15 Black reproduction switching at the Twin color copy mode ............................. 8-528.6.16 Black header density level adjustment ............................................................ 8-538.6.17 Black area adjustment in twin color copy mode............................................... 8-538.6.18 Judgment threshold adjustment for blank original ........................................... 8-538.6.19 Background offsetting adjustment for ADF ...................................................... 8-54

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8.7 Image Quality Adjustment (Printing Function)................................................................. 8-558.7.1 Automatic gamma adjustment ......................................................................... 8-558.7.2 Gamma balance adjustment (Black Mode)...................................................... 8-578.7.3 Color balance adjustment ................................................................................ 8-598.7.4 Adjustment of faint text .................................................................................... 8-608.7.5 Upper limit value at Toner Saving Mode.......................................................... 8-608.7.6 Maximum toner density adjustment (OHP)...................................................... 8-618.7.7 Fine line enhancement switchover .................................................................. 8-618.7.8 PureBlack/PureGray threshold adjustment (PS) ........................................... 8-618.7.9 PureBlack/PureGray threshold adjustment (PCL)......................................... 8-628.7.10 PureBlack/PureGray threshold adjustment (XPS)......................................... 8-628.7.11 PureBlack/PureGray threshold adjustment (Twin color print) ....................... 8-628.7.12 Toner limit threshold adjustment...................................................................... 8-638.7.13 Screen switchover ........................................................................................... 8-638.7.14 Sharpness adjustment ..................................................................................... 8-648.7.15 Adjustment of smudged text (1200 dpi) ........................................................... 8-648.7.16 Thin line width lower limit adjustment .............................................................. 8-648.7.17 Color/black judgment setting for twin color printing images............................. 8-648.7.18 Background adjustment ................................................................................... 8-65

8.8 Image Quality Adjustment (Scanning Function).............................................................. 8-668.8.1 Gamma balance adjustment............................................................................ 8-668.8.2 Density adjustment .......................................................................................... 8-678.8.3 Background adjustment (Color Mode) ............................................................. 8-688.8.4 Judgment threshold for ACS (common for copy & network scan) ................... 8-688.8.5 Sharpness adjustment ..................................................................................... 8-698.8.6 Setting range correction................................................................................... 8-698.8.7 Fine adjustment of black density ..................................................................... 8-708.8.8 RGB conversion method selection .................................................................. 8-718.8.9 Adjustment of saturation .................................................................................. 8-718.8.10 Background processing offset adjustment....................................................... 8-72

8.9 Image Quality Adjustment (FAX Function)...................................................................... 8-738.9.1 Density adjustment .......................................................................................... 8-738.9.2 Beam level conversion setting ......................................................................... 8-74

9. LASER OPTICAL UNIT ................................................................................................ 9-19.1 General Description .......................................................................................................... 9-19.2 Structure............................................................................................................................ 9-39.3 Electric Circuit Description ................................................................................................ 9-9

9.3.1 Laser diode control circuit .................................................................................. 9-99.3.2 Polygonal motor control circuit......................................................................... 9-109.3.3 Mirror motor control circuit ............................................................................... 9-11

9.4 Disassembly and Replacement....................................................................................... 9-139.4.1 Laser optical unit.............................................................................................. 9-139.4.2 Laser optical unit cooling fan (front) (F22) ....................................................... 9-169.4.3 Laser optical unit cooling fan (rear) (F23)........................................................ 9-189.4.4 Shutter ............................................................................................................. 9-199.4.5 Shutter motor ................................................................................................... 9-199.4.6 Shutter sensor (home position)........................................................................ 9-209.4.7 Shutter sensor (end position)........................................................................... 9-219.4.8 Disassembly and replacement of the polygonal motor .................................... 9-21

10. PAPER FEEDING SYSTEM........................................................................................ 10-110.1 General Descriptions....................................................................................................... 10-110.2 Composition .................................................................................................................... 10-310.3 Functions......................................................................................................................... 10-410.4 Description of Operation ................................................................................................. 10-6

10.4.1 Drive of rollers.................................................................................................. 10-610.4.2 Operation of bypass pickup roller .................................................................... 10-710.4.3 Operation of drawer pickup roller..................................................................... 10-8

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10.4.4 Paper size detection ........................................................................................ 10-910.4.5 Separation of paper ....................................................................................... 10-1010.4.6 General operation .......................................................................................... 10-11

10.5 Electric Circuit Description ............................................................................................ 10-1310.5.1 Registration motor control circuit ................................................................... 10-1310.5.2 Transport motor-1 control circuit .................................................................... 10-1410.5.3 Transport motor-2 control circuit .................................................................... 10-1510.5.4 Feed motor control circuit .............................................................................. 10-1610.5.5 Feed/Transport motor control circuit .............................................................. 10-1710.5.6 Tray-up motor-1 control circuit ....................................................................... 10-1810.5.7 Tray-up motor-2 control circuit ....................................................................... 10-1910.5.8 Tandem LCF tray-up motor control circuit ..................................................... 10-2010.5.9 Tandem LCF end fence motor control circuit................................................. 10-21

10.6 Disassembly and Replacement..................................................................................... 10-2210.6.1 Bypass feed tray ............................................................................................ 10-2210.6.2 Bypass feed unit ............................................................................................ 10-2210.6.3 Bypass pickup solenoid (SOL8)..................................................................... 10-2310.6.4 Bypass paper sensor (S71) ........................................................................... 10-2310.6.5 Bypass pickup roller....................................................................................... 10-2410.6.6 Bypass upper unit .......................................................................................... 10-2510.6.7 Bypass feed roller .......................................................................................... 10-2610.6.8 Bypass transport roller ................................................................................... 10-2610.6.9 Bypass motor(M12) ....................................................................................... 10-2710.6.10 1st drawer idling roller.................................................................................... 10-2810.6.11 Bypass separation roller ............................................................................... 10-2910.6.12 Bypass feed sensor (S72) ............................................................................. 10-3110.6.13 Bypass paper size detection sensor (S70) .................................................... 10-3110.6.14 Drawer feeding unit........................................................................................ 10-3210.6.15 Feed roller...................................................................................................... 10-3310.6.16 Pickup roller ................................................................................................... 10-3310.6.17 Separation roller ............................................................................................ 10-3410.6.18 Transport roller .............................................................................................. 10-3410.6.19 Drawer detection sensor (S73/S81/S89/S97)................................................ 10-3610.6.20 Drawer feed sensor (S78/S86/S94/S102) ..................................................... 10-3710.6.21 Drawer transport sensor (S77/S85/S93/S101) .............................................. 10-3710.6.22 Drawer empty sensor (S75/S83/S91/S99)..................................................... 10-3810.6.23 Drawer tray-up sensor (S76/S84/S92/S100) ................................................. 10-3810.6.24 Drawer bottom sensor (S74/S82/S90/S98) ................................................... 10-3910.6.25 Registration roller (Rubber) ........................................................................... 10-3910.6.26 Paper dust cleaning brush (registration roller) ............................................... 10-4010.6.27 Registration guide.......................................................................................... 10-4110.6.28 Registration sensor (S52) .............................................................................. 10-4110.6.29 Registration roller (Metal) .............................................................................. 10-4210.6.30 2nd transfer side paper clinging detection sensor (S51) ............................... 10-4310.6.31 Media sensor (S69) ....................................................................................... 10-4410.6.32 Feed cover sensor (S114) ............................................................................. 10-4610.6.33 Drawer ........................................................................................................... 10-4610.6.34 Drawer paper size detection sensor-1/2

(S79/S80/S87/S88/S95/S96/S103/S104) ...................................................... 10-4710.6.35 Registration motor (M39) ............................................................................... 10-4710.6.36 Feed/transport drive unit ................................................................................ 10-4810.6.37 Transport motor-1 (M40)................................................................................ 10-4810.6.38 Transport motor-2 (M41)................................................................................ 10-4910.6.39 Feed motor (M42) .......................................................................................... 10-4910.6.40 Feed/transport motor (M43)........................................................................... 10-4910.6.41 Paper feed drive unit...................................................................................... 10-5010.6.42 3rd drawer transport clutch (CLT4)/3rd drawer feed clutch (CLT5) ............... 10-5010.6.43 4th drawer transport clutch (CLT6)/4th drawer feed clutch(CLT7) ................ 10-51

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10.6.44 Tray-up motor-1 (M44)................................................................................... 10-5110.6.45 Tray-up motor-2 (M45)................................................................................... 10-5310.6.46 Transfer belt paper clinging detection sensor (S47) ...................................... 10-5410.6.47 Tandem LCF tray-up motor (M46) ................................................................. 10-5510.6.48 Tandem LCF end fence motor (M47) ............................................................ 10-5610.6.49 Tandem LCF standby unit ............................................................................. 10-5710.6.50 Tandem LCF feeding unit .............................................................................. 10-5810.6.51 Stopper opening/closing solenoid (front) (SOL10)/

Stopper opening/closing detection sensor (front) (S110) .............................. 10-5810.6.52 Stopper opening/closing solenoid (rear)/

Stopper opening/closing detection sensor (rear) (S111) ............................... 10-6010.6.53 Tandem LCF bottom sensor (S107) .............................................................. 10-6110.6.54 Standby side tray paper amount detection sensor (S106)............................. 10-6110.6.55 End fence home position sensor (S112)........................................................ 10-6310.6.56 End fence stop position sensor (S113).......................................................... 10-6410.6.57 Standby side empty sensor (S109)................................................................ 10-6510.6.58 Standby side tray detection sensor (S108).................................................... 10-6510.6.59 Tandem LCF solenoid (SOL9)....................................................................... 10-66

10.7 Adjustment of the Paper Feeding System..................................................................... 10-6710.7.1 Adjustment of the media sensor position....................................................... 10-6710.7.2 Separation roller pressure force adjustment.................................................. 10-6810.7.3 Sheet sideways deviation caused by paper transporting adjustment ............ 10-6910.7.4 Adjusting the clearance of the paper and side guides ................................... 10-72

11. PROCESS UNIT RELATED SECTION....................................................................... 11-111.1 General description ......................................................................................................... 11-111.2 Composition .................................................................................................................... 11-311.3 Functions......................................................................................................................... 11-411.4 Electric Circuit Description .............................................................................................. 11-8

11.4.1 High-voltage transformer control circuit ........................................................... 11-811.4.2 Drum Surface Potential Sensor Control Circuit ............................................. 11-1011.4.3 Drum Temperature Detection Circuit ............................................................. 11-1311.4.4 Drum motor control circuit.............................................................................. 11-1411.4.5 Temperature/humidity detection circuit .......................................................... 11-1511.4.6 Toner motor control circuit ............................................................................. 11-1611.4.7 Waste toner transport motor control circuit .................................................... 11-1711.4.8 Auto-toner Circuit ........................................................................................... 11-1811.4.9 Developer unit motor control circuit ............................................................... 11-2211.4.10 Developer unit mixer motor control circuit ..................................................... 11-23

11.5 Disassembly and Replacement..................................................................................... 11-2411.5.1 Pulling out the process unit (EPU tray).......................................................... 11-2411.5.2 Drum cleaner unit .......................................................................................... 11-2811.5.3 Drum ............................................................................................................. 11-3011.5.4 Drum cleaning blade ..................................................................................... 11-3011.5.5 Blade side seal ............................................................................................. 11-3111.5.6 Main charger unit ........................................................................................... 11-3211.5.7 Main charger grid .......................................................................................... 11-3211.5.8 Needle electrode cleaner .............................................................................. 11-3211.5.9 Needle electrode ........................................................................................... 11-3311.5.10 Discharge LED (ERS-K/ERS-C/ERS-M/ERS-Y) ........................................... 11-3311.5.11 Sub-hopper ................................................................................................... 11-3311.5.12 Sub-hopper toner sensor (S38/S39/S40/S41) ............................................. 11-3411.5.13 EPU cover ..................................................................................................... 11-3411.5.14 Sub-hopper toner motor (K/C/M/Y) (M19/M20/M21/M22) ............................. 11-3511.5.15 EPU PC board .............................................................................................. 11-3611.5.16 Drum surface potential sensors control PC board (V0S board) .................... 11-3711.5.17 Auger lock detection sensor (S42) ................................................................ 11-3711.5.18 Main charger ozone exhaust fan-K/-C/-M/-Y (F17/F1/F19/F20) ................... 11-3811.5.19 Needle electrode cleaner detection sensor-K/C/M/Y (S30/S31/S32/S33) .... 11-39

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11.5.20 Needle electrode cleaner motor-K/-C/-M/-Y (M23/M24/M25/M26) ................ 11-3911.5.21 V0 sensor shutter solenoid (K/C/M/Y) (SOL4/SOL5/SOL6/SOL7) ............... 11-4011.5.22 Drum surface potential sensor (K/C/M/Y) (S34/S35/S36/S37) ..................... 11-4211.5.23 Drum thermistor (K/Y) (THM1/THM2) ........................................................... 11-4311.5.24 Developer unit................................................................................................ 11-4311.5.25 Developer material......................................................................................... 11-4511.5.26 Developer sleeve ........................................................................................... 11-4811.5.27 Doctor blade .................................................................................................. 11-5011.5.28 Auto-toner sensor-K/C/M/Y (S26/S27/S28/S29)............................................ 11-5011.5.29 Drum drive unit .............................................................................................. 11-5111.5.30 Drum motor-K (M27)...................................................................................... 11-5211.5.31 Drum motor-YMC (M28) ................................................................................ 11-5211.5.32 K drum phase sensor (S44)........................................................................... 11-5311.5.33 Color drum phase sensor (S43)..................................................................... 11-5411.5.34 Developer unit motor-K/YMC (M29)/(M31) .................................................... 11-5511.5.35 Developer unit mixer motor-K/YMC (M30)/(M32) .......................................... 11-5511.5.36 Developer drive unit ....................................................................................... 11-5511.5.37 Waste toner box............................................................................................. 11-5611.5.38 Waste toner amount detection sensor (S13) ................................................. 11-5711.5.39 Waste toner box full detection sensor (S14).................................................. 11-5811.5.40 Waste toner box detection sensor (S16) ....................................................... 11-5911.5.41 Ozone filter-1 ................................................................................................ 11-5911.5.42 Ozone filter-2 ................................................................................................ 11-6011.5.43 Toner filter ..................................................................................................... 11-6011.5.44 Toner motor (K/C/M/Y) (M15,/M16/M17/M18) ............................................... 11-6211.5.45 Toner cartridge paddle rotation detection sensor-K/C/M/Y (S8/S9/S10/S11) 11-6411.5.46 Waste toner transport motor (M33)................................................................ 11-6411.5.47 Waste toner transport unit ............................................................................. 11-6511.5.48 Ozone suctioning fan (F24) ........................................................................... 11-6611.5.49 Toner cartridge heat insulation fan (F21) ...................................................... 11-6711.5.50 Toner cooling exhaust fan (F31).................................................................... 11-6811.5.51 Temperature/humidity sensor (S12) .............................................................. 11-6911.5.52 Toner motor interlock switch (SW3)............................................................... 11-6911.5.53 EPU cooling fan (F14) ................................................................................... 11-7111.5.54 Scattered toner suctioning fan (F25) ............................................................. 11-71

11.6 Adjustment of the Process Unit Related Section .......................................................... 11-7311.6.1 High-Voltage Transformer Setting ................................................................. 11-7311.6.2 Adjustment of the Auto-Toner Sensor ........................................................... 11-7311.6.3 Adjustment of the doctor-sleeve gap ............................................................. 11-74

12. TRANSFER UNIT........................................................................................................ 12-112.1 General Descriptions....................................................................................................... 12-112.2 Composition .................................................................................................................... 12-212.3 Functions......................................................................................................................... 12-312.4 General description of operation ..................................................................................... 12-5

12.4.1 Self steering mechanism ................................................................................. 12-512.4.2 Printing in the color modes .............................................................................. 12-612.4.3 Printing in the black mode ............................................................................... 12-712.4.4 Color registration control.................................................................................. 12-8

12.5 Electric Circuit Description ............................................................................................ 12-1012.5.1 Transfer belt motor control circuit .................................................................. 12-1012.5.2 Transfer belt cam motor control circuit .......................................................... 12-11

12.6 Disassembly and Replacement..................................................................................... 12-1212.6.1 Pulling out the transfer belt unit ..................................................................... 12-1212.6.2 2nd transfer facing roller cleaning pad .......................................................... 12-1312.6.3 Transfer belt cleaning unit ............................................................................. 12-1412.6.4 Transfer belt cleaning blade ......................................................................... 12-1512.6.5 Transfer belt cleaner side seal ...................................................................... 12-1512.6.6 Transfer belt unit (TBU) ................................................................................. 12-17

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12.6.7 Transfer belt................................................................................................... 12-1912.6.8 Transfer belt motor (M13) .............................................................................. 12-2112.6.9 Transfer belt cam motor (M14) ...................................................................... 12-2112.6.10 Transfer belt contact/release detection sensor (S46) ................................... 12-2212.6.11 1st transfer roller (Y/M/C/K) ........................................................................... 12-2212.6.12 Drive roller / Drive roller cleaning mylar ........................................................ 12-2312.6.13 Tension roller ................................................................................................. 12-2512.6.14 2nd transfer facing roller ............................................................................... 12-2512.6.15 2nd transfer unit (TRU) .................................................................................. 12-2812.6.16 2nd transfer roller .......................................................................................... 12-3012.6.17 2nd transfer roller lubricant unit .................................................................... 12-3012.6.18 2nd transfer roller cleaning blade ................................................................. 12-3112.6.19 2nd transfer roller side seal .......................................................................... 12-3112.6.20 TRU waste toner box .................................................................................... 12-3312.6.21 TRU waste toner amount detection sensor (S17).......................................... 12-3312.6.22 TRU waste toner auger drive section ............................................................ 12-3412.6.23 TRU waste toner transport motor (M11) ........................................................ 12-3512.6.24 TRU waste toner motor (M10) ....................................................................... 12-3612.6.25 2nd transfer drive unit .................................................................................... 12-3612.6.26 2nd transfer motor (M9) ................................................................................. 12-3712.6.27 2nd transfer roller contact/release clutch (CLT2)........................................... 12-3712.6.28 2nd transfer roller drive clutch (CLT3) ........................................................... 12-3812.6.29 2nd transfer roller contact/release detection sensor (S50) ............................ 12-38

12.7 Adjustment of the transfer belt ...................................................................................... 12-4012.7.1 Adjustment of the degree of the transfer belt unit parallelization................... 12-40

13. IMAGE QUALITY CONTROL ..................................................................................... 13-113.1 General Description ........................................................................................................ 13-113.2 Composition .................................................................................................................... 13-213.3 Principle of the Sensor .................................................................................................... 13-313.4 Image Quality Control Flow Chart ................................................................................... 13-413.5 Disassembly and Replacement....................................................................................... 13-5

13.5.1 Image quality control unit ................................................................................. 13-513.5.2 Image position aligning sensor (front) (S20).................................................... 13-513.5.3 Image position aligning sensor (center) (S21) ................................................. 13-513.5.4 Image position aligning sensor (rear) (S22)..................................................... 13-613.5.5 Image quality sensor (S23).............................................................................. 13-613.5.6 Image quality shutter solenoid (SOL3) ............................................................ 13-7

13.6 Performing Image Quality Control................................................................................... 13-8

14. FUSER UNIT ............................................................................................................... 14-114.1 General Description ........................................................................................................ 14-114.2 Composition .................................................................................................................... 14-214.3 Functions......................................................................................................................... 14-3

14.3.1 Fuser belt section ............................................................................................ 14-314.3.2 Pressure roller section ..................................................................................... 14-414.3.3 IH coil section .................................................................................................. 14-514.3.4 Fuser drive section .......................................................................................... 14-5

14.4 Description of Operation ................................................................................................. 14-614.5 Electric Circuit Description .............................................................................................. 14-7

14.5.1 Fuser unit control circuit................................................................................... 14-714.5.2 IH coil ............................................................................................................. 14-2014.5.3 Fuser motor control circuit ............................................................................. 14-23

14.6 Disassembly and Replacement..................................................................................... 14-2414.6.1 Fuser unit....................................................................................................... 14-2614.6.2 Pressure roller cover...................................................................................... 14-2714.6.3 Transport guide-1 .......................................................................................... 14-2814.6.4 Transport guide-2 .......................................................................................... 14-2914.6.5 Entrance guide cover..................................................................................... 14-29

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14.6.6 Separation finger .......................................................................................... 14-3014.6.7 Separation plate............................................................................................. 14-3114.6.8 Pressure roller / Pressure roller heater lamp (LAMP)................................... 14-3314.6.9 Fuser belt / Fuser roller / Fuser belt guide / Satellite roller ........................ 14-3714.6.10 Fuser belt rotation detection sensor (S49)..................................................... 14-4414.6.11 Fuser belt center thermostat (THMO4) /

Fuser belt side thermostat (THMO5) ............................................................. 14-4514.6.12 Fuser belt edge thermistor (THM6)................................................................ 14-4614.6.13 Pressure roller center thermistor (THM3) /

Pressure roller side thermistor (THM4) / Pressure roller edge thermistor (THM5) ........................................................ 14-48

14.6.14 Pressure roller contact/release detection sensor (S48)................................. 14-5114.6.15 Pressure roller center thermostat (THMO2) /

Pressure roller side thermostat (THMO3)...................................................... 14-5214.6.16 IH coil ............................................................................................................. 14-5414.6.17 Fuser belt center thermopile (THMP1) /

Fuser belt side thermopile (THMP2).............................................................. 14-5614.6.18 Fuser motor (M6) ........................................................................................... 14-5614.6.19 Pressure roller contact/release clutch (CLT1) ............................................... 14-5814.6.20 Exit paper cooling fan (rear) (F15)................................................................. 14-6114.6.21 IH cooling fan-1 (F8) / IH cooling fan-2 (F9) .................................................. 14-6314.6.22 IH board (IH) .................................................................................................. 14-6314.6.23 Fuser unit jam releasing LED (LED) .............................................................. 14-64

14.7 Gap Adjustment for Fuser Unit...................................................................................... 14-6514.7.1 Gap adjustment for fuser belt thermostats..................................................... 14-6514.7.2 Gap adjustment for pressure roller thermistors ............................................. 14-6914.7.3 Gap adjustment for pressure roller thermostats ............................................ 14-7214.7.4 Gap adjustment for separation plate.............................................................. 14-75

15. EXIT / REVERSE / DUPLEX SECTION ...................................................................... 15-115.1 General Description ........................................................................................................ 15-115.2 Composition .................................................................................................................... 15-415.3 Functions......................................................................................................................... 15-6

15.3.1 Paper exit unit ................................................................................................. 15-615.3.2 Bridge unit........................................................................................................ 15-715.3.3 Duplexing bridge unit ....................................................................................... 15-815.3.4 Duplexing unit .................................................................................................. 15-8

15.4 Description of Operations................................................................................................ 15-915.4.1 Paper transport paths .................................................................................... 15-1015.4.2 Circulation during duplex printing .................................................................. 15-12

15.5 Flow Chart for duplex printing ....................................................................................... 15-1615.6 Disassembly and Replacement .................................................................................... 15-18

15.6.1 Upper exit section cooling fan-1(F32) / Upper exit section cooling fan-2 (F33)........................................................... 15-18

15.6.2 Lower exit section cooling fan-1(F34) / Lower exit section cooling fan-2 (F35)........................................................... 15-18

15.6.3 Lower exit section cooling fan-3(F36)............................................................ 15-1915.6.4 Exit motor (M2) .............................................................................................. 15-1915.6.5 Upper paper exit sensor (S61) /

Upper exit tray paper full detection sensor (S62) .......................................... 15-2015.6.6 Lower paper exit sensor (S63)....................................................................... 15-2215.6.7 Reverse section stationary jam detection sensor (S60) ................................ 15-2315.6.8 Reverse path cover switch (SW5) ................................................................. 15-2415.6.9 Upper paper exit roller ................................................................................... 15-2615.6.10 Lower paper exit roller ................................................................................... 15-2715.6.11 Bridge unit...................................................................................................... 15-2715.6.12 Bridge unit front cover.................................................................................... 15-2815.6.13 Bridge unit lower cover .................................................................................. 15-2915.6.14 Bridge unit transport entrance motor (M4) / Reverse motor (M3).................. 15-30

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15.6.15 Bridge unit transport exit motor (M5) ............................................................. 15-3115.6.16 Bridge unit upper cover.................................................................................. 15-3315.6.17 Bridge unit transport roller-1 .......................................................................... 15-3415.6.18 Bridge unit transport roller-2 .......................................................................... 15-3615.6.19 Bridge unit transport roller-3 .......................................................................... 15-3715.6.20 Reverse roller ................................................................................................ 15-3915.6.21 Bridge unit exit roller-1................................................................................... 15-4015.6.22 Bridge unit exit roller-2................................................................................... 15-4115.6.23 Transport path switching solenoid-1 (SOL1) ................................................. 15-4115.6.24 Transport path switching solenoid-2 (SOL2) ................................................. 15-4215.6.25 Bridge unit path entrance sensor (S55) ......................................................... 15-4315.6.26 Bridge unit path exit sensor (S56) ................................................................. 15-4415.6.27 Reverse sensor (S59).................................................................................... 15-4515.6.28 Reverse section stationary jam detection sensor (S58) ................................ 15-4615.6.29 Exit paper cooling fan (front) (F5) .................................................................. 15-4715.6.30 Bridge unit cooling fan (front) (F6) ................................................................. 15-4915.6.31 Bridge unit cooling fan (rear) (F7).................................................................. 15-5015.6.32 Front cover opening/closing detection switch (SW9) /

Bridge unit connecting detection switch (SW8) ............................................. 15-5115.6.33 Duplexing bridge unit ..................................................................................... 15-5215.6.34 Duplexing unit opening/closing detection sensor (S64)................................. 15-5215.6.35 Reverse path sensor (S57)............................................................................ 15-5315.6.36 Duplexing bridge unit transport roller............................................................. 15-5415.6.37 Duplexing unit upper cover ............................................................................ 15-5515.6.38 Duplexing unit front side cover ...................................................................... 15-5615.6.39 Duplexing unit rear side cover ....................................................................... 15-5615.6.40 Reversed paper cooling fan (F11) ................................................................. 15-5615.6.41 ADU motor-1 (M7) ......................................................................................... 15-5715.6.42 ADU motor-2 (M8) ......................................................................................... 15-5815.6.43 ADU board ..................................................................................................... 15-5915.6.44 ADU transport roller-1.................................................................................... 15-5915.6.45 ADU transport roller-2.................................................................................... 15-6115.6.46 ADU transport roller-3.................................................................................... 15-6315.6.47 Duplexing unit path exit sensor (S67)............................................................ 15-6415.6.48 Fuser transport sensor (S65)......................................................................... 15-6415.6.49 Duplexing unit path entrance sensor (S66) ................................................... 15-6515.6.50 Duplexing unit cover opening/closing detection sensor (SW7)...................... 15-6615.6.51 Duplexing unit interlock switch (SW4) ........................................................... 15-67

16. REVERSING AUTOMATIC DOCUMENT FEEDER (RADF) ...................................... 16-116.1 General Description ........................................................................................................ 16-116.2 Functions......................................................................................................................... 16-216.3 Description of Operation ................................................................................................. 16-3

16.3.1 Paper path ....................................................................................................... 16-316.3.2 Drive ................................................................................................................ 16-416.3.3 Original size detection ..................................................................................... 16-5

16.4 Electric Circuit Description .............................................................................................. 16-816.4.1 Signal block diagram ....................................................................................... 16-816.4.2 Electric circuit description ................................................................................ 16-9

16.5 Disassembly and Replacement..................................................................................... 16-1416.5.1 RADF ............................................................................................................. 16-1416.5.2 RADF front cover ........................................................................................... 16-1516.5.3 RADF rear cover............................................................................................ 16-1616.5.4 Original jam access cover.............................................................................. 16-1716.5.5 RADF left cover ............................................................................................. 16-1816.5.6 Original tray ................................................................................................... 16-1816.5.7 Original reverse tray ...................................................................................... 16-1916.5.8 Platen sheet unit ............................................................................................ 16-1916.5.9 RADF exit tray ............................................................................................... 16-20

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16.5.10 Reading start guide unit ................................................................................. 16-2116.5.11 Exit guide / Exit/reverse guide / Reading end guide ...................................... 16-2216.5.12 Paper feeder unit ........................................................................................... 16-2416.5.13 Pickup roller .................................................................................................. 16-2516.5.14 Feed roller ..................................................................................................... 16-2616.5.15 Separation roller ........................................................................................... 16-2716.5.16 Original registration roller............................................................................... 16-2816.5.17 Intermediate transport roller........................................................................... 16-2916.5.18 Reading start roller ........................................................................................ 16-3016.5.19 Reading end roller ......................................................................................... 16-3216.5.20 Exit roller........................................................................................................ 16-3316.5.21 Exit/reverse roller........................................................................................... 16-3416.5.22 Exit intermediate roller ................................................................................... 16-3516.5.23 Reverse roller ................................................................................................ 16-3616.5.24 Original feed motor (MR1) ............................................................................. 16-3816.5.25 Original feed motor bracket ........................................................................... 16-3816.5.26 Read motor (MR2) ......................................................................................... 16-3916.5.27 Read motor bracket ....................................................................................... 16-4016.5.28 Original reverse motor (MR3) ..................................................