Brother MFC9500, MFC9000, MFC7650MC, MFC7550MC, MFC6550MC Service Manual

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FACSIMILE EQUIPMENT

SERVICE MANUAL

MODEL: FAX3550/3650/8000P/8200P

MFC4450/4550/4550plus MFC6550MC/7550MC/7650MC MFC9000/9500

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 adjustment—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. DISASSEMBL Y/REASSEMBLY AND LUBRICATION CHAPTER V. MAINTENANCE MODE CHAPTER VI. ERROR INDICATION AND TROUBLESHOOTING

APPENDICES Circuit Diagrams

This manual describes the model and its 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: AUGUST 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.

251 (H)

Weight: Machine proper Approx. 8.5 kg (excluding the drum unit and toner cartridge)

In package Approx. 13.5 kg (FAX3550/3650/8000P/8200P)

1.2 Components

The equipment consists of the following major components:

Multi-purpose sheet feeder

Drum unit with toner cartridge loaded

Laser unit

383 (W)

(excluding the handset)

Approx. 14 kg (MFC4450/4550/4550plus/6550MC/7550MC/

452 (D)

(Unit: mm)

7650MC/9000/9500)

Top cover

Control panel ASSY

Heat-fixing unit

Inner cover

Handset

Gear drive unit

Low-voltage power supply ASSY

Bottom plate

Main cover

Scanner frame ASSY NCU PCB ASSY

Main PCB

Relay PCB

High-voltage power supply ASSY

I – 1

2. SPECIFICATIONS

MODEL FAX3550 MFC4550 MFC6550MC MFC7550MC COLOR 1267 1138 1138 1138 PRINTER Option

Engine — HL-720 HL-730 HL-730 PPM — 6 6 6 dpi — 600 x 600 600 x 600 600 x 600 Paper Capacity 200 200 200 200 Standards — Windows GDI (600x600) Windows GDI (600x600) Windows GDI (600x600) Emulation — No PCL4 (300x300) PCL4 (300x300) Memory (Typical) — 512 KB 512 KB 1 MB Memory (Min.) — 300 KB 400 KB 1 MB Fonts Resident — No 24-bit map (PCL4 Comp) 24-bit map (PCL4 Comp) Fonts Disk Based — No Yes Yes Paper Handling LTR, LGL, A4 LTR, LGL, EXE, A4, B5, A5 LTR, LGL, EXE, A4, B5, A5 LTR, LGL, EXE, A4, B5, A5

Multi-purpose Sheet Custom Size (2.85x5-8x14) Custom Size (2.85x5-8x14) Custom Size (2.85x5-8x14) Custom Size (2.85x5-8x14) Feeder

Printer Driver — Windows 3.1, 95 Driver with Windows 3.1, 95 Driver with Windows 3.1, 95 Driver with

Toner Life (5%/page) 2200 pages 2200 pages 2200 pages 2200 pages Utility Software — — RPC RPC

SCANNER Option

Color/Mono — Mono Mono Mono Gray Scale — 64 256 256 dpi — 400 x 400 600 x 600 600 x 600 Twain — Yes Yes Yes ADF Capacity (pages) (30) 30 30 30 Formats — TIFF/BMP (by M/L) TIFF/BMP (by M/L) TIFF/BMP (by M/L) OCR — Option Yes Yes

Envelope (BL/C5/COM 10/Mona) Envelope (BL/C5/COM 10/Mona) Envelope (BL/C5/COM 10/Mona) Envelope (BL/C5/COM 10/Mona)

Auto Installer Program Auto Installer Program Auto Installer Program

(1/2)

COPY

dpi 200 x 400 200 x 400 600 class 600 class No. of Copies 1-99 1-99 1-99 1-99 Sorting No No Yes Yes Reduction/Enlargement 50-200% 50-200% 50-200% 50-200%

FAX

Modem ROCKWELL V12 ROCKWELL V12 ROCKWELL V24 ROCKWELL V24 Modem Speed 14400 bps (FAX only) 14400 bps (FAX only) 14400 bps (FAX only) 14400 bps (FAX only) CCITT Group G3 G3 G3 G3 Coding Method MH/MR/MMR MH/MR/MMR MH/MR/MMR MH/MR/MMR Transmission Speed 6 sec. 6 sec. 6 sec. 6 sec. Input/Output Width 8.5"/8.5" 8.5"/8.5" 8.5"/8.5" 8.5"/8.5" LCD Size 16 x 1 16 x 2 16 x 2 16 x 2 Super Fine Yes (Send only) Yes (Send only) Yes (Send only) Yes Gray Scale 64 64 64 64 Smoothing Yes Yes Yes Yes Handset Yes Yes Yes Yes One-touch Dial 20 x 2 12 x 2 12 x 2 12 x 2 Speed Dial 100 36 36 100 Telephone Index Yes Yes Yes Yes Contrast Super L/Auto/Super D Super L/Auto/Super D Super L/Auto/Super D Super L/Auto/Super D Multi-resolution Transmission FAX/TEL Switch Yes Yes Yes Yes Distinctive Ringing Yes Yes Yes Yes Caller ID Yes Yes Yes Yes Next FAX-reservation Yes Yes Yes Yes Help Yes Yes Yes Yes TAD Interface Yes Yes Yes Yes

Yes Yes Yes Yes

I – 2

MODEL FAX3650 MFC4450 MFC4550plus MFC7650MC COLOR 1267 1138 1138 1138 PRINTER Option

Engine — HL-720 HL-720 HL-730 PPM — 6 6 6 dpi 200 x 200 600 x 600 600 x 600 600 x 600 Paper Capacity 200 200 200 200 Standards Windows GDI (200x200) Windows GDI (600x600) Windows GDI (600x600) Windows GDI (600x600) Emulation — No PCL4 (300x300) PCL4 (300x300) Memory (Typical) — 512 KB 512 KB 1 MB Memory (Min.) — 300 KB 400 KB 600 KB Fonts Resident — No 24-bit map (PCL4 Comp) 24-bit map (PCL4 Comp) Fonts Disk Based — No Yes Yes Paper Handling LTR, LGL, A4 LTR, LGL, A4, B5, A5 LTR, LGL, A4, B5, A5 LTR, LGL, A4, B5, A5

Multi-purpose Sheet — Custom Size (2.85x5-8x14) Custom Size (2.85x5-8x14) Custom Size (2.85x5-8x14) Feeder

Printer Driver — Windows 3.1, 95 Driver with Windows 3.1, 95 Driver with Windows 3.1, 95 Driver with

Toner Life (5%/page) 2200 pages 2200 pages 2200 pages 2200 pages Utility Software — — RPC RPC

SCANNER Option

Color/Mono — Mono Mono Mono Gray Scale — 64 64 256 dpi — 400 x 400 400 x 400 600 x 600 Twain — Yes Yes Yes ADF Capacity (pages) — 30 30 30 Formats (Import) — Formats (Export) — TIFF/BMP/UNI TIFF/BMP/MAX TIFF/BMP/MAX OCR — Option Yes Yes

Envelope (BL/C5/COM 10/Mona) Envelope (BL/C5/COM 10/Mona) Envelope (BL/C5/COM 10/Mona)

Auto Installer Program Auto Installer Program Auto Installer Program

TIFF/BMP/PCX/DCX/BTF/BTX/UNI TIFF/BMP/PCX/DCX/BTF/BTX/MAX TIFF/BMP/PCX/DCX/BTF/BTX/MAX

(1/2)

COPY

dpi 200 x 400 200 x 400 200 x 400 600 class No. of Copies 1-99 1-99 1-99 1-99 Sorting Yes No No Yes Reduction/Enlargement 50-200% 50-200% 50-200% 50-200%

FAX

Modem ROCKWELL V12 Toshiba ROCKWELL V12 ROCKWELL V24 Modem Speed 14400 bps (FAX only) 9600 bps (FAX only) 14400 bps (FAX only) 14400 bps (FAX only) CCITT Group G3 G3 G3 G3 Coding Method MH/MR/MMR MH/MR/MMR MH/MR/MMR MH/MR/MMR Transmission Speed 6 sec. 9 sec. 6 sec. 6 sec. Input/Output Width 8.5"/8.5" 8.5"/8.5" 8.5"/8.5" 8.5"/8.5" LCD Size 16 x 1 16 x 2 16 x 2 16 x 2 Super Fine Yes Yes Yes Yes Gray Scale 64 64 64 64 Smoothing Yes Yes Yes Yes Handset Yes No Yes Yes One-touch Dial 20 x 2 12 x 2 12 x 2 12 x 2 Speed Dial 100 36 36 100 Telephone Index Yes Yes Yes Yes Contrast Super L/Auto/Super D Super L/Auto/Super D Super L/Auto/Super D Super L/Auto/Super D Multi-resolution Transmission FAX/TEL Switch Yes Yes (with External) Yes Yes Distinctive Ringing Yes Yes (with External) Yes Yes Caller ID Yes No Yes Yes Next FAX-reservation Yes Yes Yes Yes Help Yes Yes Yes Yes TAD Interface Yes Yes Yes Yes

Yes Yes Yes Yes

I – 3

MODEL FAX8000P MFC9000 MFC9500 FAX8200P COLOR 1138 1138 1138 1138 PRINTER Option Option

Engine — HL-730 HL-730 — PPM — 6 6 — dpi — Paper Capacity 200 200 200 200 Standards — Windows GDI Windows GDI — Emulation — PCL4 PCL4 — Memory (Typical) — 512 KB 512 KB — Memory (Min.) — 400 KB 400 KB — Fonts Resident — 24-bit map (PCL4 Comp) 24-bit map (PCL4 Comp) — Fonts Disk Based — Yes Yes — Paper Handling A4, B5, A5 A4, B5, A5 A4, B5, A5 A4

Multi-purpose Tray

Printer Driver — Windows 3.1, 95 Driver with Windows 3.1, 95 Driver with

Toner Life (5%/page) 2200 pages 2200 pages 2200 pages 2200 pages Utility Software —

SCANNER Option Option

Color/Mono — Mono Mono — Gray Scale — 256 256 — dpi — 600 x 600 600 x 600 — Twain — Yes Yes — ADF Capacity (pages) 30 30 30 — Formats — TIFF/BMP TIFF/BMP — OCR — Option Yes —

Custom Size (73x127-126x350 mm) Custom Size (73x127-216x350 mm) Custom Size (73x127-216x350 mm)

Envelope (DL/C5/COM 10/Mona) Envelope (DL/C5/COM 10/Mona) Envelope (DL/C5/COM 10/Mona)

600 x 600 (GDI) / 300 x 300 (PCL4) 600 x 600 (GDI) / 300 x 300 (PCL4)

Auto Installer Program Auto Installer Program

Mac Driver (Option) Mac Driver (Option)

Remote Priter Console (RPC) Remote Printer Console (RPC)

—

(1/2)

COPY

dpi 200 x 400 300 x 400 300 x 400 200 x 400 No. of Copies 1-99 1-99 1-99 1-99 Sorting Reduction/Enlargement 50-200% 50-200% 50-200% 50-200%

FAX

Modem ROCKWELL V12 ROCKWELL V12 ROCKWELL V24 ROCKWELL V12 Modem Speed 14400 bps (FAX only) 14400 bps (FAX only) 14400 bps (FAX only) 14400 bps (FAX only) CCITT Group G3 G3 G3 G3 Coding Method MH/MR/MMR MH/MR/MMR MH/MR/MMR MH/MR/MMR Transmission Speed 6 sec. 6 sec. 6 sec. 6 sec. Input/Output Width 8.5"/8.5" 8.5"/8.5" 8.5"/8.5" 8.5"/8.5" LCD Size 16 x 1 16 x 2 (STN) 16 x 2 (STN) 16 x 1 Super Fine (Send) Yes Yes Yes Yes Super Fine (Receive) Gray Scale 64 64 64 64 Smoothing Yes Yes Yes Yes Handset No No No No One-touch Dial 20 x 2 12 x 2 12 x 2 20 x 2 Speed Dial 100 100 100 100 Telephone Index Yes Yes Yes Yes Contrast Light/Auto/Dark Light/Auto/Dark Light/Auto/Dark Light/Auto/Dark Multi-resolution Transmission FAX/TEL Switch Yes Yes Yes Yes Distinctive Ringing Yes Yes Yes — Caller ID Next FAX-reservation Yes Yes Yes Yes Help Yes Yes Yes Yes TAD Interface Yes Yes Yes Yes

Available with optional memory

Available with optional memory Available with optional memory Available with optional memory

Yes Yes Yes Yes

Yes (U.K., Sweden, Holland and France) Yes (U.K., Sweden, Holland and France) Yes (U.K., Sweden, Holland and France) Yes (U.K., Sweden, Holland and France)

Yes Yes Yes

Yes

I – 4

MODEL FAX3550 MFC4550 MFC6550MC MFC7550MC FAX

Coverpage Yes, Super Yes, Super Yes, Super Yes, Super Polling Type Std/Del/Seq Std/Del/Seq Std/Del/Seq Std/Del/Seq Receive password Yes Yes Yes Yes Delayed Transmission Yes, 3 timings Yes, 3 timings Yes, 3 timings Yes, 3 timings Call Reservation Yes Yes Yes Yes Callback Message Yes Yes Yes Yes Page Memory (TX)* 300 KB (30 pgs: MMR) 200 KB (20 pgs: MMR) 300 KB (30 pgs: MMR) 700 KB (70 pgs: MMR) Out-of-paper Reception* 400 KB (40 pgs: MMR) 400 KB (40 pgs: MMR) 600 KB (60 pgs: MMR) 1.5 MB (150 pgs: MMR) Super Quick Scan Yes Yes Yes Yes Auto Reduction Yes Yes Yes Yes ECM Yes Yes Yes Yes Broadcasting Y e s Yes Yes Yes Multi Transmission Yes Yes Y es Yes

MESSAGE CENTER

TAD Feature No No Yes (Hardware & PC) Yes (Hardware & PC) ICM Recording Time No No Hardware: 15 min. Hardware: 30 min. Paging No No Yes (Hardware & PC) Yes (Hardware & PC) Toll Saver No No Yes (Hardware & PC) Yes (Hardware & PC) OGM No No Yes (Hardware & PC) Yes (Hardware & PC) Mail Box No No Yes (PC only) Yes (PC only) Fax-on-demand No No Yes (PC only) Yes (PC only) Voice-on-demand No No Yes (PC only) Yes (PC only) FAX Forwarding Yes Yes Yes Yes FAX Retrieval Yes Yes Yes Yes

(2/2)

MACHINE MEMORY 0.75 MB 0.75 MB 1 MB 2 MB

OPTIONAL MEMORY 1 or 2 MB 1 or 2 MB 1 or 2 MB 1 or 2 MB

(FAX & PRINTER FLEX)

PC FAX (Send/Receive) Option Yes (by M/L) Yes (by M/L) Yes (by M/L)

Standard — Class 1, 2 Class 1, 2 Class 1, 2

DATA MODEM No No No No

INTERFACE

Printer Interface —

PC Interface

Extended I/O Interface — —

Simultaneous

Sends FAX and Prints — Yes Yes Yes Receives FAX and Prints Receives FAX and Scans Prints and Scans — Yes Yes Yes Receives FAX and Copies Prints and Copies — Yes Yes Yes

RS-232C

(8-pin modular connector)

MULTI-FUNCTION LINK

— Yes Yes Yes — Yes Yes Yes

— Yes Yes Yes

Centronics parallel (w/o cable) Centronics parallel (w/o cable) Centronics parallel (w/o cable) MULTI-FUNCTION LINK PRO MULTI-FUNCTION LINK PRO MULTI-FUNCTION LINK PRO

———

RS-232C and RS-422 RS-232C and RS-422 (supported by an optional serial (supported by an optional serial interface board RS-100M) interface board RS-100M)

* CCITT#1 Chart in the Standard Mode, MMR

I – 5

MODEL FAX3650 MFC4450 MFC4550plus MFC7650MC FAX

Coverpage Yes, Super Yes, Super Yes, Super Yes, Super Polling Type Std/Del/Seq Std/Del/Seq Std/Del/Seq Std/Del/Seq Delayed Transmission Yes, 13 timings Yes, 3 timings Yes, 3 timings Yes, 13 timings Call Reservation Yes Yes (with External) Yes Yes Callback Message Yes Yes Yes Yes Page Memory (TX)* 1 MB (100 pgs: MMR) 300 KB (30 pgs: MMR) 300 KB (30 pgs: MMR) 800 KB (80 pgs: MMR) Out-of-paper Reception* 1.1 MB (110 pgs: MMR) 600 KB (60 pgs: MMR) 600 KB (60 pgs: MMR) 1.0 MB (100 pgs: MMR) Super Quick Scan Yes Yes Yes Yes ECM Yes Yes Yes Yes Broadcasting Yes Yes Yes Yes Multi Transmission No Yes Yes No

MESSAGE CENTER

ICM Recording Time No No No Hardware: 30 min. Paging Yes (Hardware & PC) Yes (Hardware & PC) Yes (Hardware & PC) Yes (Hardware & PC) Toll Saver No No No Yes (Hardware & PC) OGM No No No Yes (Hardware & PC) Mail Box No No Yes (PC only) Yes (PC only) Fax-on-demand No No No Yes (PC only) Voice-on-demand No No No Yes (PC only) FAX Forwarding Yes Yes Yes Yes FAX Retrieval Yes Yes Yes Yes

(2/2)

MACHINE MEMORY 2 MB 1 MB 1 MB 2 MB

OPTIONAL MEMORY 1 or 2 MB No 1 or 2 MB 1 or 2 MB

(FAX & PRINTER FLEX)

PC FAX (Send/Receive) Option Yes (by M/L) Yes (by M/L) Yes (by M/L)

Standard — SMSI SMSI SMSI

DATA MODEM No No No No

INTERFACE

Printer Interface —

PC Interface

Extended I/O Interface — — —

Simultaneous

Sends FAX and Prints — Yes Yes Yes Receives FAX and Prints Receives FAX and Scans Prints and Scans — Yes Yes Yes Receives FAX and Copies Prints and Copies — Yes Yes Yes

RS-232C

(8-pin modular connector)

MULTI-FUNCTION LINK

— Yes Yes Yes — Yes Yes Yes

— Yes Yes Yes

Centronics parallel (w/o cable) Centronics parallel (w/o cable) Centronics parallel (w/o cable) MULTI-FUNCTION LINK PRO MULTI-FUNCTION LINK PRO MULTI-FUNCTION LINK PRO

———

RS-232C and RS-422 (supported by an optional serial interface board RS-100M)

* CCITT#1 Chart in the Standard Mode, MMR

I – 6

MODEL FAX8000P MFC9000 MFC9500 FAX8200P FAX

Coverpage Yes, Super Yes, Super Yes, Super Yes, Super Polling Type Std/Del/Seq/Sec Std/Del/Seq/Sec Std/Del/Seq/Sec Std/Del/Seq/Sec Receive password Yes/Plus Yes/Plus Yes/Plus Yes/Plus Delayed Transmission Yes, 3 timings Yes, 3 timings Yes, 3 timings Yes, 3 timings Call Reservation Yes Yes Yes Yes Callback Message Yes Yes Yes Yes Page Memory (TX)* 300 KB (30 pgs: MMR) 300 KB (30 pgs: MMR) 300 KB (30 pgs: MMR) 1 MB (100 pgs: MMR) Out-of-paper Reception* 400 KB (40 pgs: MMR) 600 KB (40 pgs: MMR) 600 KB (60 pgs: MMR) 1.1 MB (110 pgs: MMR) Super Quick Scan Yes Yes Yes Yes Auto Reduction Yes Yes Yes Yes ECM Yes Yes Yes Yes Broadcasting Up to 140 destinations Up to 124 destinations Up to 124 destinations Up to 190 destinations Multi Transmission Yes Yes Y es Yes

MESSAGE CENTER

TAD Feature No No Yes (Hardware & PC) No ICM Recording Time No No Hardware: 15 min. No Paging No No Yes (Hardware & PC) No Toll Saver No No Yes (Hardware & PC) No OGM UK/SWISS/AUS/GER UK/SWISS Yes (Hardware & PC) UK/SWISS/GER Mail Box No No Yes (PC only) No Fax-on-demand No No Yes (PC only) No Voice-on-demand No No Yes (PC only) No FAX Forwarding Yes Yes Yes Yes FAX Retrieval Yes Yes Yes Yes

(2/2)

MACHINE MEMORY 0.75 MB 1 MB 1 MB 2 MB

OPTIONAL MEMORY 1 or 2 MB 1 or 2 MB 1 or 2 MB 1 or 2 MB

(FAX & PRINTER FLEX)

PC FAX (Send/Receive) Option Yes Yes Option

Standard — Class 2 Class 2 —

DATA MODEM No No No No

INTERFACE

Printer Interface —

PC Interface

CONNECT 5000 INTERFACE CONNECT 5000 INTERFACE

Extended I/O Interface —

Simultaneous

Sends FAX and Prints — Yes Yes — Receives FAX and Prints Receives FAX and Scans Prints and Scans — Yes Yes — Receives FAX and Copies Prints and Copies — Yes Yes —

RS-232C

(8-pin modular connector) (8-pin modular connector)

—YesYes— —YesYes—

—YesYes—

Centronics parallel (w/o cable) Centronics parallel (w/o cable) — MULTI-FUNCTION LINK PRO MULTI-FUNCTION LINK PRO

——

RS-232C and RS-422 RS-232C and RS-422

(supported by an optional serial (supported by an optional serial

interface board RS-100M) interface board RS-100M)

RS-232C

—

* CCITT#1 Chart in the Standard Mode, MMR

I – 7

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

2.1Scanner Mechanism.............................................................................. III-3

2.1.1Document feeding and ejecting mechanism................................... III-3

2.1.2Document scanning mechanism..................................................... III-3

2.2Laser Printing Mechanism...................................................................... III-4

2.2.1Paper pulling-in, registration, feeding, and ejecting mechanism..... III-4

2.2.2Print process mechanism................................................................ III-6

(1) Charging process.................................................................... III-7

(2) Exposing process.................................................................... III-7

(3) Developing process................................................................. III-8

(4) Transferring process................................................................ III-8

(5) Erasing process....................................................................... III-8

2.2.3Heat-fixing mechanism................................................................... III-9

2.3Sensors and Actuators........................................................................... III-10

3. CONTROL ELECTRONICS........................................................................... III-12

3.1Configuration...........................................................................................III-12

3.2Main PCB................................................................................................III-13

3.3Relay PCB..............................................................................................III-23

3.4NCU PCB................................................................................................III-24

3.5Control Panel PCB................................................................................. III-27

3.6Power Supply PCBs............................................................................... III-28

[ 1 ]Low-voltage power supply PCB.................................................. III-28

[ 2 ]High-voltage power supply PCB................................................. III-29

1. OVERVIEW

Line

Control panel

NCU

Handset

PC/AT

RS-232C RS-422

RS-232C

(Modular connector)

[FAX3550/3650/ 8000P/8200P]

Centronics parallel interface

[MFC4450/ 4550/4550plus/ 6550MC/7550MC/7650MC/ 9000/9500]

Optional serial interface

(Extended I/O connector)

[MFC6550MC/7550MC/ 7650MC/9000/9500]

Fax Control Section Laser Printing Control Section

Printer data

Laser printing unit

Charging, exposing, developing, transferring, erasing, and heat-fixing processes

- Electrical charger

- Laser unit (including the polygon motor)

- Laser-sensitive drum

- Developer roller

- Transfer roller

- Eraser lamp

- Heater roller

- Main motor

Paper feeding mechanism

Low- and high-voltage power supplies

Speaker

Scanner unit

- LED array

- CCD unit

- Scanner motor

Fax data

MAC

III – 1

2. MECHANISMS

The equipment is classified into the following mechanisms:

■ SCANNER MECHANISM – Document feeding and ejecting mechanism

■ LASER PRINTING MECHANISM – Paper pulling-in, registration, feeding, and

■ SENSORS AND ACTUA TORS

Paper pulling-in and registration mechanism

– Document scanning mechanism

ejecting mechanisms

– Print process mechanism (consisting of

charging, exposing, developing, transferring, and erasing processes)

– Heat-fixing mechanism

Document feeding and ejecting mechanism

Document scanning mechanism

Paper ejecting mechanism

Heat-fixing mechanism Print process mechanism

LASER PRINTING MECHANISM

SCANNER MECHANISM

With paper feeding mechanism

III – 2

2.1 Scanner Mechanism

Document

Document stacker

2nd mirror

Document front sensor actuator

Document take-in roller ASSY

Separation roller ASSY

Document rear sensor actuator

Nip-related parts

ADF parts

LED array

2.1.1 Document feeding and ejecting mechanism

Document feed roller ASSY

Document pressure bar

Document ejection roller ASSY

Document feeding and ejecting mechanism

Document scanning mechanism

CCD unit

Lens

1st mirror

Document tray

(Front)

This mechanism consists of the document stacker, automatic document feeder (ADF), document feed 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 document take-in roller ASSY, separation roller ASSY, ADF parts and nip-related 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 Document scanning mechanism

The scanner uses a charge coupled device (CCD) image sensor. As illustrated above, the LED array illuminates a document and the reflected light of the

scanned image data is transmitted via the mirrors into the lens which reduces the scanned data so as to form the image on the CCD.

III – 3

2.2 Laser Printing Mechanism

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

Paper pulling-in and registration mechanism

Paper

Multi-purpose sheet feeder

Hopper

Registration sensor actuator

Registration roller

Sheet feeder cover

Paper feeding mechanism

Pull-in roller

Paper ejecting mechanism

Paper ejection roller

Paper ejection sensor actuator

Paper tray

Heater roller

Laser-sensitive drum

Pull-in roller drive gear

Main motor

Gear drive unit

Heater roller drive gear

Paper ejection roller drive gear

Drum drive gear

III – 4

Paper pulling-in and registration mechanism

Solenoid lever

Paper feed solenoid

Gear drive unit

Heater roller drive gear

Paper ejection roller drive gear

Clutch release lever Solenoid spring

Clutch spring

Pull-in roller drive gear

Intermediate gear Clutch gear

Gear 20/90

Drum drive gear

Planetary gear system

(Front)

Main motor

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 on and off to the pull-in roller drive gear.

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

photo sensor 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.

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2.2.2 Print process mechanism

Toner augers

Toner cartridge

Toner sensor

Polygon mirror

Polygon motor

Laser unit

Paper

Developer roller

Toner supply roller

Transfer roller

Drum unit

Laser-sensitive drum

Cleaner roller

Charger (Corona wire)

Mirror

Cover glass

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.

A single cycle of laser-sensitive drum operation

1 Charges the drum surface positively .

+1000

+700

+400 +300

Electrical charge on the drum surface (V)

(a)

(b)

2 Exposes the drum surface to a laser beam to

form a latent image and develops the latent image with toner.

(a) Unexposed area (Non-image area) (b) Exposed area (Image area)

3 Transfers the toner-formed image from the

drum to paper.

4 Erases the residual potential.

Time

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(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.

Varister

Approx. 1000V

Approx. 280V

---

+ +

Corona wire

Grid

High-voltage power source

Aluminum drum

Laser-sensitive layer

Positive charging source

Drum

(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.

Laser detector

Laser diode

Laser-sensitive drum

Paper

Laser beam

f θ lens

Lens

Laser beam

Polygon mirror

Polygon motor

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(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.

Switch “a” (ON for the transfer process)

Switch “b” (ON for repulsing toner from the transfer roller)

Toner augers

Chamber

Blade

Transfer roller

Toner

Toner supply roller

DC bias

Laser-sensitive drum

Developer roller

Eraser lamp

Cleaner roller

(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

Pressure roller

Heater roller (including the FU lamp)

Heat-fixing unit

(Paper ejection roller)

Paper

(Paper ejection sensor actuator)

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

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2.3 Sensors and Actuators

This equipment has ten sensors: two microswitches, six photosensors and two thermisters as described below.

Sensor name Type Located on Hook switch sensor Microswitch Hook switch PCB

Cover sensor Microswitch Relay PCB Registration sensor Photosensor (PC1) Relay PCB Sheet feeder cover sensor Photosensor (PC2) Relay PCB Paper ejection sensor Photosensor (PC1) High-voltage power supply PCB Document front sensor Photosensor (PC1) Document sensor PCB Document rear sensor Photosensor (PC2) Document sensor PCB Toner sensor Photosensor (PH1) Toner sensor PCB (on the laser unit) Toner thermister P1 Toner sensor PCB (on the laser unit) Heater thermister __ Fixing unit

• Hook switch sensor which detects whether the handset is placed on the handset mount.

• Cover sensor which detects whether the top cover is closed.

• Registration sensor which detects the leading and trailing edges of paper, which allows the controller to determine the registration timing and check paper jam.

• Sheet feeder cover sensor which detects whether the sheet feeder cover is closed.

• Paper ejection sensor which detects whether the recording paper goes out of the equipment.

• Document front sensor which detects the presence of documents.

• Document rear sensor which detects the leading and trailing edges of pages to tell the control circuitry when the leading edge of a new page has reached the starting position and when the scan for that page is over.

• Toner sensor which detects whether there is toner or a toner cartridge is loaded.

• Toner thermister which detects the temperature of the toner cartridge.

• Heater thermister which detects the temperature of the heater roller of the fixing unit.

These photosensors are a photointerrupter consisting of a light-emitting diode and a lightsensitive transistor. Each of them has an actuator separately arranged as shown on the next page.

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Registration sensor actuator

Registration sensor (Photosensor)

(Main PCB)

Toner thermister

(On back of PCB)

Toner sensor

(Low-voltage power supply PCB)

Hook switch sensor (Microswitch)

Hook switch sensor actuator

(Eraser lamp board)

Document front sensor actuator

Document front sensor (Photosensor)

(Document sensor PCB)

(Relay PCB)

(Toner sensor PCB)

(Fixing unit)

Sheet feeder cover sensor actuator Sheet feeder cover sensor

(Photosensor)

Cover sensor actuator Cover sensor (Microswitch)

(High-voltage power supply PCB)

Paper ejection sensor actuator

Paper ejection sensor (Photosensor)

Heater thermister Document rear sensor actuator Document rear sensor

(Photosensor)

Location of Sensors and Actuators

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+ 161 hidden pages