Brother MFC6650MC, MFC4650, MFC4350, FAX2750 Service Manual

FACSIMILE EQUIPMENT

SERVICE MANUAL

MODEL: FAX2750/FAX-8250P

MFC4350/MFC4650/MFC6650MC/ MFC-9050/MFC-9550

form or by any means without permission in writing from the publisher.

Specifications are subject to change without notice.

PREFACE

This publication is a Service Manual covering the specifications, construction, theory of operation, and maintenance of the Brother facsimile equipment. It includes information required for field troubleshooting and repair--disassembly, reassembly, and lubrication--so that service personnel will be able to understand equipment function, to rapidly repair the equipment and order any necessary spare parts.

To perform appropriate maintenance so that the facsimile equipment is always in best condition for the customer, the service personnel must adequately understand and apply this manual.

This manual is made up of six chapters and appendices.

CHAPTER I. GENERAL DESCRIPTION CHAPTER II. INSTALLATION CHAPTER III. THEORY OF OPERATION CHAPTER IV. DISASSEMBLY/REASSEMBLY AND LUBRICATION CHAPTER V. MAINTENANCE MODE CHAPTER VI. ERROR INDICATION AND TROUBLESHOOTING

Appendix 1. EEPROM Customizing Codes Appendix 2. Circuit Diagrams

This manual describes the models and their versions to be destined for major countries. The specifications and functions are subject to change depending upon each destination.

SAFETY INFORMATION

Laser Safety (110-120V Model only)

This printer is certified as a Class 1 laser product under the US Department of Health and Human Services (DHHS) Radiation Performance Standard according to the Radiation Control for Health and Safety Act of 1968. This means that the printer does not produce hazardous laser radiation.

Since radiation emitted inside the printer is completely confined within the protective housings and external covers, the laser beam cannot escape from the machine during any phase of user operation.

CDRH Regulations (110-120V Model only)

The Center for Device and Radiological Health (CDRH) of the US Food and Drug Administration implemented regulations for laser products on August 2, 1976. These regulations apply to laser products manufactured from August 1, 1976. Compliance is mandatory for products marketed in the United States. The label shown below indicates compliance with the CDRH regulations and must be attached to laser products marketed in the United States.

The label for Japanese products

MANUFACTURED: MAY 1998 K BROTHER INDUSTRIES, LTD. 15-1 Naeshiro-cho, Mizuho-ku, Nagoya 467-8561, Japan. This product complies with FDA radiation performance standards, 21 CFR Subchapter J.

CHAPTER I.

GENERAL DESCRIPTION

CONTENTS

1. EQUIPMENT OUTLINE........................................................................................I-1

1.1External Appearance and Weight..................................................................I-1

1.2Components.................................................................................................I-1

2. SPECIFICATIONS................................................................................................I-2

1. EQUIPMENT OUTLINE

1.1 External Appearance and Weight

The figure below shows the equipment appearance and approximate dimensions.

Weight: Machine proper Approx. 7.2 kg

Machine (incl. drum unit & toner cartridge) Approx. 8.5 kg In package Approx. 12 kg

1.2 Components

The equipment consists of the following major components:

I - 1

2. SPECIFICATIONS

Model FAX2750 MFC4350

Color White (1397) White (1138) PRINTER Available with option * Engine/Type [YL (VA)] YL (VA) PPM [6 ppm] 6 ppm dpi (output resolution) [600 x 600] 600 x 600 Paper Capacity [200] 200 Emulation (Standard) - PCL4 Standards [Windows GDI (600 x 600)] Windows GDI (600 x 600) Memory (Typical) [1 MB] 1 MB Memory (Min.) [600 KB] 600 KB Fonts Resident - Fonts Disk Based [Yes - 35TT] Yes - 4TT Paper Handling [LTR, LGL, A4, B5, A5, OHP] LTR, LGL, A4, B5, A5, OHP Multi-Purpose Sheet Feeder [Custom Size (2.75 x 5, 8.5 x 14)

Printer Driver [Windows3.1/3.11, 95 and NT4.0 Driver Utility Software - RPC

Period to go in Sleep Mode [0-99] 0-99 Output Size [LTR, LGL, A4, B5, A5] LTR, LGL, A4, B5, A5 Optional LAN Board No No Optional Mac Board No No Interface/Interface Cable [Yes (Bi Centro)/No] Yes (Bi Centro)/Yes SCANNER Available with option * Color/Mono [Mono] [Mono] dpi [OPT 200 x 400 (600 x 600)] [OPT 200 x 400 (600 x 600)] Gray Scale [256] [256] Twain [Yes] [Yes] Formats (Import) [TIFF/BMP/PCX/DCX/BTF/ BTX/MAX/PDF] [TIFF/BMP/PCX/DCX/BTF/ BTX/MAX/PDF] Formats (Export) [TIFF/BMP/MAX/PDF] [TIFF/BMP/MAX/PDF] ADF (pages) [20] * OCR [Xerox Textbridge] [Xerox Textbridge] COPY Yes Yes dpi 203 x 391 203 x 391 Collating 99 99 Reduction/Enlargement 50, 75, 87, 93, 100, 120, 125, 150, 200% 50, 75, 87, 93, 100, 120, 125, 150, 200% Sorting Yes Yes FAX Yes Yes Modem/Speed (bps) Toshiba 3080 (14.4K FAX Only) Toshiba 3080 (14.4K FAX Only) CCITT Group G3 G3 Coding Method MH/MR/MMR MH/MR/MMR Error Correction Mode (ECM) Yes Yes Transmission Speed (sec) 6 6 Gray Scale 64 64 Super Fine Yes Yes Smoothing Yes Yes Multi-Resolution TX Yes Yes Input/Output Width 8.5" x 8.5" 8.5" x 8.5" LCD Size 16 x 1 16 x 2 Handset Yes Yes Duplex Speaker Phone No No

*1 Optional CD-ROM required. *2 30 pages under the following conditions: - Temperature: 20°C to 30°C - RH: 50% to 70%

Specifications enclosed in brackets are available if options are used.

Envelop (DL/C5/CM10/Mona)]

with Auto Installer Program]

- Forms type: Xerox 4200 (20 lb/LTR), Xerox 4024 (24 lb/LTR), M.PPC (64 g/m2/A4)

- Loading as shown at right. (Loading more than 20 pages in any other way will result in a double feed or paper jam.)

Custom Size (2.75 x 5, 8.5 x 14)

Envelop (DL/C5/CM10/Mona)

Windows3.1/3.11, 95 and NT4.0 Driver

with Auto Installer Program

Available with option *

Yes

[20] *

(1/2)

I - 2

Model MFC4650 MFC6650MC

Color White (1138) White (1138) PRINTER Yes Yes Engine/Type YL (VA) YL (VA) PPM 6 ppm 6 ppm dpi (output resolution) 600 x 600 600 x 600 Paper Capacity 200 200 Emulation (Standard) PCL4 PCL4 Standards Windows GDI (600 x 600) Windows GDI (600 x 600) Memory (Typical) 1 MB 1 MB Memory (Min.) 600 KB 600 KB Fonts Resident - 24 bitMAP (PCL4Comp) Fonts Disk Based Yes - 35TT Yes - 35TT Paper Handling LTR, LGL, A4, B5, A5, OHP LTR, LGL, A4, B5, A5, OHP Multi-Purpose Sheet Feeder Custom Size (2.75 x 5, 8.5 x 14)

Printer Driver Windows3.1/3.11, 95 and NT4.0 Driver with Auto

Envelop (DL/C5/CM10/Mona)

Installer Program

Custom Size (2.75 x 5, 8.5 x 14)

Envelop (DL/C5/CM10/Mona)

Windows3.1/3.11, 95 and NT4.0 Driver with Auto

Installer Program Utility Software RPC RPC Period to go in Sleep Mode 0-99 0-99 Output Size LTR, LGL, A4, B5, A5 LTR, LGL, A4, B5, A5 Optional LAN Board No No Optional Mac Board No No Interface/Interface Cable Yes (Bi Centro)/Yes Yes (Bi Centro)/Yes SCANNER Yes Yes Color/Mono Mono Mono dpi OPT 200 x 400 (600 x 600) OPT 200 x 400 (600 x 600) Gray Scale 256 256 Twain Yes Yes Formats (Import) TIFF/BMP/PCX/DCX/BTF/ BTX/MAX/PDF TIFF/BMP/PCX/DCX/BTF/ BTX/MAX/PDF Formats (Export) TIFF/BMP/MAX/PDF TIFF/BMP/MAX/PDF ADF (pages) 20 *

20 *

OCR Yes (Xerox Textbridge) Yes (Xerox Textbridge) COPY Yes Yes dpi 203 x 391 203 x 391 Collating 99 99 Reduction/Enlargement 50, 75, 87, 93, 100, 120, 125, 150, 200% 50, 75, 87, 93, 100, 120, 125, 150, 200% Sorting Yes Yes FAX Yes Yes Modem/Speed (bps) Toshiba 3080 (14.4K FAX Only) Toshiba 3080 (14.4K FAX Only) CCITT Group G3 G3 Coding Method MH/MR/MMR MH/MR/MMR Error Correction Mode (ECM) Yes Yes Transmission Speed (sec) 6 6 Gray Scale 64 64 Super Fine Yes Yes Smoothing Yes Yes Multi-Resolution TX Yes Yes Input/Output Width 8.5" x 8.5" 8.5" x 8.5" LCD Size 16 x 2 16 x 2 Handset Yes Yes Duplex Speaker Phone No No

*1 Optional CD-ROM required. *2 30 pages under the following conditions: - Temperature: 20°C to 30°C - RH: 50% to 70%

- Forms type: Xerox 4200 (20 lb/LTR), Xerox 4024 (24 lb/LTR), M.PPC (64 g/m2/A4)

- Loading as shown at right. (Loading more than 20 pages in any other way will result in a double feed or paper jam.)

Specifications enclosed in brackets are available if options are used.

(1/2)

I - 3

Model FAX-8250P MFC-9050

Color White (1397) White (1138) PRINTER Available with option *

Yes Engine/Type [YL (VA)] YL (VA) PPM [6 ppm] 6 ppm dpi (output resolution) [600 x 600] 600 x 600 Paper Capacity [200] 200 Emulation (Standard) - Standards [Windows GDI (600 x 600)] Windows GDI (600 x 600) Memory (Typical) [1 MB] 1 MB Memory (Min.) [600 KB] 600 KB Fonts Resident - Fonts Disk Based [Yes - 35TT] Paper Handling [LTR, LGL, A4, B5, A5, OHP] LTR, LGL, A4, B5, A5, OHP Multi-Purpose Sheet Feeder [Custom Size (2.75 x 5, 8.5 x 14)

Printer Driver [Available with option (Windows3.1/3.11, 95 and

Envelop (DL/C5/CM10/Mona)]

NT4.0 Driver with Auto Installer Program)]

Custom Size (2.75 x 5, 8.5 x 14)

Envelop (DL/C5/CM10/Mona)

Windows3.1/3.11, 95 and NT4.0 Driver with Auto

Installer Program Utility Software - Period to go in Sleep Mode [0-99] 0-99 Output Size [LTR, LGL, A4, B5, A5] LTR, LGL, A4, B5, A5 Optional LAN Board No No Optional Mac Board No No Interface

Interface Cable SCANNER Available with option *

[Yes (Bi Centro)

No]

Yes (Bi Centro)

Yes <Germany version only>

Available with option *

Color/Mono [Mono] [Mono] dpi [OPT 200 x 400 (600 x 600)] [OPT 200 x 400 (600 x 600)] Gray Scale [256] [256] Twain [Yes] [Yes] Formats (Import) [TIFF/BMP/PCX/DCX/BTF/ BTX/MAX/PDF] [TIFF/BMP/PCX/DCX/BTF/ BTX/MAX/PDF] Formats (Export) [TIFF/BMP/MAX/PDF] [TIFF/BMP/MAX/PDF] ADF (pages) [20] *

[20] *

OCR [Xerox Textbridge] [Xerox Textbridge] COPY Yes Yes dpi 203 x 391 203 x 391 Collating 99 99 Reduction/Enlargement 50, 75, 87, 93, 100, 120, 125, 150, 200% 50, 75, 87, 93, 100, 120, 125, 150, 200% Sorting Yes Yes FAX Yes Yes Modem/Speed (bps) Toshiba 3080 (14.4K FAX Only) Toshiba 3080 (14.4K FAX Only) CCITT Group G3 G3 Coding Method MH/MR/MMR MH/MR/MMR Error Correction Mode (ECM) Yes Yes Transmission Speed (sec) 6 6 Gray Scale 64 64 Super Fine Yes Yes Smoothing Yes Yes Multi-Resolution TX Yes Yes Input/Output Width 8.5" x 8.5" 8.5" x 8.5" LCD Size 16 x 1 16 x 2 Handset No No Duplex Speaker Phone No No

*1 Optional CD-ROM required. *2 30 pages under the following conditions: - Temperature: 20°C to 30°C - RH: 50% to 70%

- Forms type: Xerox 4200 (20 lb/LTR), Xerox 4024 (24 lb/LTR), M.PPC (64 g/m2/A4)

- Loading as shown at right. (Loading more than 20 pages in any other way will result in a double feed or paper jam.)

Specifications enclosed in brackets are available if options are used.

(1/2)

I - 4

(1/2)

Model MFC-9550

Color White (1138) PRINTER Yes Engine/Type YL (VA) PPM 6 ppm dpi (output resolution) 600 x 600 Paper Capacity 200 Emulation (Standard) PCL4 Standards Windows GDI (600 x 600) Memory (Typical) 1 MB Memory (Min.) 600 KB Fonts Resident 24 bitMAP (PCL4Comp) Fonts Disk Based Yes - 35TT Paper Handling LTR, LGL, A4, B5, A5, OHP Multi-Purpose Sheet Feeder Custom Size (2.75 x 5, 8.5 x 14)

Printer Driver Windows3.1/3.11, 95 and NT4.0 Driver with Auto Utility Software RPC

Period to go in Sleep Mode 0-99 Output Size LTR, LGL, A4, B5, A5 Optional LAN Board No Optional Mac Board No Interface

Interface Cable SCANNER Yes Color/Mono Mono dpi OPT 200 x 400 (600 x 600) Gray Scale 256 Twain Yes Formats (Import) TIFF/BMP/PCX/DCX/BTF/ BTX/MAX/PDF Formats (Export) TIFF/BMP/MAX/PDF ADF (pages) 20 * OCR Yes (Xerox Textbridge) COPY Yes dpi 203 x 391 Collating 99 Reduction/Enlargement 50, 75, 87, 93, 100, 120, 125, 150, 200% Sorting Yes FAX Yes Modem/Speed (bps) Toshiba 3080 (14.4K FAX Only) CCITT Group G3 Coding Method MH/MR/MMR Error Correction Mode (ECM) Yes Transmission Speed (sec) 6 Gray Scale 64 Super Fine Yes Smoothing Yes Multi-Resolution TX Yes Input/Output Width 8.5" x 8.5" LCD Size 16 x 2 Handset Yes Duplex Speaker Phone No

*1 Optional CD-ROM required. *2 30 pages under the following conditions: - Temperature: 20°C to 30°C - RH: 50% to 70%

Specifications enclosed in brackets are available if options are used.

Envelop (DL/C5/CM10/Mona)

Installer Program

Yes (Bi Centro)

Yes <Germany version only>

- Forms type: Xerox 4200 (20 lb/LTR), Xerox 4024 (24 lb/LTR), M.PPC (64 g/m2/A4)

- Loading as shown at right. (Loading more than 20 pages in any other way will result in a double feed or paper jam.)

I - 5

Model FAX2750 MFC4350

One-touch Dial 12 x 2 12 x 2 Speed Dial 100 100 Tel-Index Yes Yes Chain Dialing Yes Yes Contrast SL/Auto/SD SL/Auto/SD FAX/TEL Switch Yes Yes Distinctive Ringing Yes Yes Caller ID Yes (Call Waiting) Yes (Call Waiting) TAD Interface Yes Yes Next FAX Reservation Yes, Dual Access Yes, Dual Access Dual Access Yes Yes Help Yes Yes Coverpage Yes, Super Yes, Super Polling Type Std/Seq Std/Seq Password Check No No Delayed Timer Yes, up to 50 Yes, up to 50 Broadcasting Yes, up to 174 Yes, up to 174 Call Reservation Yes Yes Page Memory (TX) * Out-of-paper Reception *

Max 1.3 MB (130 pages: MMR) Max 1.3 MB (130 pages: MMR)

Max 1.3 MB (130 pages: MMR) Max 1.3 MB (130 pages: MMR) Callback Message Yes Yes Super Quickscan Yes Yes Mail box No No Multi-Transmission No No Message Center No No OGM No No ICM Recording Time No No Paging Yes Yes Toll Saver No No Fax & Voice Mail Box No No Fax- & Voice-on-Demand No No FAX Forwarding Yes Yes FAX Retrieval Yes Yes

General

Energy Star Compliance Yes Yes Memory (Standard) 2 MB 2 MB Memory (Opt Upgrade) 1/2 MB 1/2 MB Simultaneous Operation Available with option *

(PRINTER/FAX, PRINTER/SCAN,

PRINTER/COPY)

Yes (PRINTER/FAX, PRINTER/COPY)

Available with option *

(PRINTER/SCAN) Data Modem No No Bundled Software Applications Available with option *

Available with option * PC-FAX (Send/Receive) [SMSI] [SMSI] Scanner Application [Brother] [Brother] Viewer Application [Visioneer] [Visioneer] Network Application No No Class 1 No No

*1 Optional CD-ROM required. *3 According to the Brother chart in standard mode, MMR.

Specifications enclosed in brackets are available if options are used.

(2/2)

I - 6

Model MFC4650 MFC6650MC

Max 1.3 MB (130 pages: MMR) Max 1.3 MB (130 pages: MMR)

Max 1.3 MB (130 pages: MMR) Max 1.3 MB (130 pages: MMR) Callback Message Yes Yes Super Quickscan Yes Yes Mail box No No Multi-Transmission No No Message Center No Yes (Hardware) OGM No Yes (Hardware) ICM Recording Time No Hardware: 20 min. Paging Yes Yes (Hardware) Toll Saver No Yes (Hardware) Fax & Voice Mail Box No No Fax- & Voice-on-Demand No No FAX Forwarding Yes Yes FAX Retrieval Yes Yes

General

Energy Star Compliance Yes Yes Memory (Standard) 2 MB 2 MB Memory (Opt Upgrade) 1/2 MB 1/2 MB Simultaneous Operation Yes (PRINTER/FAX, PRINTER/SCAN,

PRINTER/COPY)

Yes (PRINTER/FAX, PRINTER/SCAN,

PRINTER/COPY) Data Modem No No Bundled Software Applications Yes Yes PC-FAX (Send/Receive) SMSI SMSI Scanner Application Brother Brother Viewer Application Visioneer Visioneer Class 1 No Yes

*1 Optional CD-ROM required. *3 According to the Brother chart in standard mode, MMR.

Specifications enclosed in brackets are available if options are used.

(2/2)

I - 7

Model FAX-8250P MFC-9050

One-touch Dial 12 x 2 12 x 2 Speed Dial 100 100 Tel-Index Yes Yes Chain Dialing Yes Yes Contrast SL/Auto/SD SL/Auto/SD FAX/TEL Switch Yes Yes Distinctive Ringing Yes (Denmark version only) Yes (Denmark version only) Caller ID Yes (U.K. French/Norway/Sweden versions only) Yes (U.K. French/Norway/Sweden versions only) TAD Interface Yes Yes Next FAX Reservation Yes, Dual Access Yes, Dual Access Dual Access Yes Yes Help Yes Yes Coverpage Yes, Super Yes, Super Polling Type Std/Seq/Sec Std/Seq/Sec Password Check No No Delayed Timer Yes, up to 50 Yes, up to 50 Broadcasting Yes, up to 174 Yes, up to 174 Call Reservation Yes Yes Page Memory (TX) * Out-of-paper Reception *

Max 1.3 MB (130 pages: MMR) Max 1.3 MB (130 pages: MMR)

Max 1.3 MB (130 pages: MMR) Max 1.3 MB (130 pages: MMR) Callback Message Yes Yes Super Quickscan No No Mail box No No Multi-Transmission No No Message Center No No OGM No No ICM Recording Time No No Paging No No Fax & Voice Mail Box No No Fax- & Voice-on-Demand No No FAX Forwarding Yes Yes FAX Retrieval Yes Yes

General

Memory (Standard) 2 MB 2 MB Memory (Opt Upgrade) 1/2 MB 1/2 MB Simultaneous Operation Available with option *

(PRINTER/FAX, PRINTER/SCAN,

Yes (PRINTER/FAX, PRINTER/SCAN,

PRINTER/COPY)

PRINTER/COPY) Data Modem No No Remote Diagnostics Yes Yes Memory Security Yes No Memory Backup Yes No Bundled Software Applications Available with option *

Available with option *

PC-FAX (Send/Receive) [Wordcraft] [Wordcraft] Scanner Application [Brother] [Brother] Viewer Application [Wordcraft] [Wordcraft] Network Application No No Class 1 No

*1 Optional CD-ROM required. *3 According to the Brother chart in standard mode, MMR.

Specifications enclosed in brackets are available if options are used.

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I - 8

Model MFC-9550

One-touch Dial 12 x 2 Speed Dial 100 Tel-Index Yes Chain Dialing Yes Contrast SL/Auto/SD FAX/TEL Switch Yes Distinctive Ringing No Caller ID Yes (U.K. French/Norway/Sweden versions only) TAD Interface Yes Next FAX Reservation Yes, Dual Access Dual Access Yes Help Yes Coverpage Yes, Super Polling Type Std/Seq/Sec Password Check No Delayed Timer Yes, up to 50 Broadcasting Yes, up to 174 Call Reservation Yes Page Memory (TX) * Out-of-paper Reception *

Max 1.3 MB (130 pages: MMR)

Max 1.3 MB (130 pages: MMR) Callback Message Yes Super Quickscan No Mail box No Multi-Transmission No Message Center Yes (Hardware) OGM Yes (Hardware) ICM Recording Time Hardware: 15 min. Paging Yes (Hardware) Fax & Voice Mail Box No Fax- & Voice-on-Demand No FAX Forwarding Yes FAX Retrieval Yes

General

Memory (Standard) 2 MB Memory (Opt Upgrade) 1/2 MB Simultaneous Operation Yes (PRINTER/FAX, PRINTER/SCAN,

PRINTER/COPY) Data Modem No Remote Diagnostics Yes Memory Security No Memory Backup Yes Bundled Software Applications Yes PC-FAX (Send/Receive) Wordcraft Scanner Application Brother Viewer Application Wordcraft Class 1 Yes

*1 Optional CD-ROM required. *3 According to the Brother chart in standard mode, MMR.

Specifications enclosed in brackets are available if options are used.

(2/2)

I - 9

CHAPTER II.

INSTALLATION

CONTENTS

1. INSTALLING THE UPDATE DATA TO THE FACSIMILE EQUIPMENT...............II-1

1. INSTALLING THE UPDATE DATA TO THE FACSIMILE EQUIPMENT

If the program version is updated or the main PCB is replaced, install the update program onto the flash ROM of the main PCB.

The program installation requires a host computer satisfying the following requirements:

- CPU Pentium 75 or higher

- RAM 8MB or greater (16MB recommended for Windows 95)

- OS Windows 3.1/3.11 or Windows 95

Connecting the equipment to your computer

(1) Make sure that the equipment's power cord is unplugged from a wall socket. (2) Make sure that your computer is powered off. (3) Connect the interface cable to the parallel interface port on the back of the equipment and

secure it with the lock wires.

(4) Connect the other end of the interface cable to the printer port of your computer and secure

it with the two screws. (5) Power on your computer. (6) Plug the equipment's power cord into a wall socket.

Host computer

Interface cable

Lock wires

II - 1

Installing the update data onto the flash ROM of the facsimile equipment

(1) Load the floppy disk which stores the update data and transfer utility into the floppy disk

drive of your computer.

(Or, copy the update data and transfer utility onto the same directory of the hard disk.) (2) Click the Start button, point to Programs, and then click MS-DOS Prompt to open an MS-

DOS window. (3) Type the drive letter where the update data and transfer utility are located. If it is a floppy

disk drive, type A:\ from the command line and press the ENTER key. (4) Check that your computer is connected with the facsimile equipment correctly. (5) To start the transfer utility transmitting the update data to the flash ROM of the facsimile

equipment, type the following:

A:\ICEN filename /b

Then press the ENTER key.

The equipment beeps and shows the "CONNECTING" on the LCD for one second.

Then, the equipment shows the "DOWNLOADING" on the LCD and starts receiving data

downloaded from the host computer.

During downloading, the equipment beeps intermittently.

Upon completion of the downloading, the equipment beeps continuously.

II - 2

CHAPTER III.

THEORY OF OPERATION

CONTENTS

1. OVERVIEW...........................................................................................................III-1

2. MECHANISMS......................................................................................................III-2

2.1 Scanner Mechanism.....................................................................................

2.1.1 Document feeding and ejecting mechanism..........................................

2.1.2 Scanner................................................................................................

2.2 Laser Printing Mechanism.............................................................................

2.2.1 Paper pulling-in, registration, feeding, and ejecting mechanism.............

2.2.2 Print process mechanism......................................................................

(1)Charging process..........................................................................

(2)Exposing process.........................................................................

(3)Developing process......................................................................

(4)Transferring process.....................................................................

(5)Erasing process............................................................................

2.2.3 Heat-fixing mechanism...........................................................................

2.3 Sensors and Actuators..................................................................................

3. CONTROL ELECTRONICS..................................................................................

III-3

III-3 III-3

III-4

III-4 III-6 III-7 III-7 III-8 III-8 III-8 III-9

III-10

III-12

3.1 Configuration................................................................................................

3.2 Main PCB.....................................................................................................

3.3 NCU PCB.....................................................................................................

3.4 Control Panel PCB........................................................................................

3.5 Power Supply PCB.......................................................................................

[ 1 ] Low-voltage power supply PCB....................................................

[ 2 ] High-voltage power supply PCB...................................................

III-12 III-13 III-15 III-17 III-18

III-18 III-19

1. OVERVIEW

III - 1

*Not provided on the FAX-8250P/MFC-9050.

2. MECHANISMS

The facsimile equipment is classified into the following mechanisms:

n SCANNER MECHANISM - Document feeding and ejecting mechanism

n LASER PRINTING MECHANISM - Paper pulling-in, registration, feeding, and ejecting

n SENSORS AND ACTUATORS

- Document scanning mechanism

mechanisms

- Print process mechanism (consisting of charging, exposing, developing, transferring, and erasing processes)

- Heat-fixing mechanism

Document feeding and ejecting mechanism

SCANNER

Document scanning mechanism

MECHANISM

Paper pulling-in and registration mechanism

Print process mechanism

LASER PRINTING MECHANISM

III - 2

Paper ejecting mechanism

Heat-fixing mechanism

With paper feeding mechanism

2.1 Scanner Mechanism

2.1.1 Document feeding and ejecting mechanism

This mechanism consists of the document stacker, automatic document feeder (ADF), document ejection roller ASSY, and document sensors. (For details about the sensors, refer to Section 2.3.)

If the operator sets documents on the document stacker and starts the scanning operation, the scanner motor rotates so that the ADF (which consists of the separation roller and ADF parts) feeds those documents into the equipment, starting from the bottom sheet to the top, page by page. Each document advances with the document feed roller ASSY to the scanner, and then it is fed out of the equipment with the document ejection roller ASSY.

2.1.2 Scanner

The scanner uses a contact image sensor (CIS) unit which consists of an LED array illuminating documents, a self-focus lens array collecting the reflected light, a CIS PCB carrying out photoelectric conversion to output picture element data, and a cover glass on which a document advances. When the document passes between the document pressure bar and the cover glass, it is scanned.

III - 3

2.2 Laser Printing Mechanism

2.2.1 Paper pulling-in, registration, feeding, and ejecting mechanism

III - 4

Paper pulling-in and registration mechanism

The paper pulling-in and registration mechanism consists of the pull-in roller gear (incorporated in the multi-purpose sheet feeder), planetary gear system, paper feed solenoid, solenoid lever, clutch release lever, and registration sensor. (For the details about the sensor, refer to Section 2.3.)

If the main motor rotates clockwise, the rotation is transmitted to the intermediate gear of the planetary gear system. As the intermediate gear rotates, the pull-in roller drive gear also rotates since the clutch gear is locked by the solenoid lever and the clutch release lever. Accordingly, the pull-in roller in the multi-purpose sheet feeder rotates to pull in paper into the equipment, a sheet at a time.

If the paper feed solenoid is retracted and the clutch release lever is operated according to the cam profile of the pull-in roller gear so as to release the clutch gear, the clutch gear rotates and the pull-in roller drive gear does not rotate. In this way, the clutch gear switches the transmission of the motor rotation to the pull-in roller drive gear on and off.

The solenoid on/off timing and the clutch release lever timing allow this mechanism to pull in a sheet and register it against the registration roller.

Paper feeding and ejecting mechanism If the main motor rotates clockwise, the rotation is transmitted via the gear train to the drum drive

gear, heater roller drive gear, and paper ejection roller drive gear. After the paper passes through the heat-fixing process, it will be ejected onto the paper tray. If the leading edge of the paper pushes up the actuator of the paper ejection sensor, the

photosensor becomes opened, signaling the start of paper ejection. If the trailing edge has passed through the sensor actuator, the sensor becomes closed, signaling the completion of paper ejection. Then, the main motor stops rotation.

III - 5

2.2.2 Print process mechanism

The print process unit works with laser beam, electrical charges, and toner. The graph below shows the transition of electrical charge on the surface of the laser-sensitive drum through the five processes: charging, exposing, developing, transferring, and erasing processes.

III - 6

(1) Charging process

The high-voltage power supply applies DC bias to the corona wire to generate ion on the grid. The ion uniformly charges the surface of the laser-sensitive drum to approx. 1000V which is kept by the varister grounding the grid to the frame.

(2) Exposing process

When the laser-sensitive drum holds a positive electrical charge, the laser beam issued from the laser unit scans the drum according to the print image to expose the drum surface for neutralizing the spots where black should be, forming an electrostatic latent image.

III - 7

(3) Developing process

The developing process develops an electrostatic latent image formed on the drum in the exposing process, into a toner image.

The developer roller attracts the toner particles fed from the toner cartridge by the toner supply roller, and then conveys them to the contact section with the laser-sensitive drum

On the contact section between the developer roller and drum, the positive toner particles stick to the neutralized spots on the drum according to the principles of attraction and repulsion, transforming a latent image into a toner image.

The toner augers (which agitate toner particles in the chamber) and the blade allow toner particles to be fed onto the developer roller at an even thickness.

(4) Transferring process

When a paper passes between the drum and the transfer roller, the switch "a" (see the above illustration) is turned on to negatively charge the transfer roller. The toner is positive, so the toner image formed on the drum will be transferred onto the paper according to the same principle as for the developing process.

If the toner image fails to stick to the paper due to paper jam or other errors, it will stick to the transfer roller. To repulse this toner, the switch "b" (see the above illustration) is turned on to positively charge the transfer roller. The toner returns from the transfer roller to the drum.

Cleaning the drum In the transferring process, not all the toner particles on the drum are transferred onto the paper

but some toner particles remain on the drum. The cleaner roller cleans the drum surface and collects the residual toner. When printing starts or during non-printing, the toner collected on the cleaner roller will be discharged onto the drum and returned to the chamber through the developer roller for recycling in the subsequent developing process.

(5) Erasing process

The eraser lamp emits light to expose the drum surface, which erases the residual electrical charge.

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2.2.3 Heat-fixing mechanism

As the paper passes between the heater roller and the pressure roller in the heat-fixing unit, the heater roller fuses the toner on the paper.

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