Brother MFC8700, MFC8600, MFC8300, FAX5750, FAX4750 Service Manual

FACSIMILE EQUIPMENT

SERVICE MANUAL

MODEL: FAX[phone]

MFC8300/8600/8700
FAX8350P/8750P
MFC9650

© Copyright Brother 2000
All rights reserved.
No part of this publication may be reproduced in any form or by any means without permission in writing

from the publisher.
Specifications are subject to change without notice.

All products and company names mentioned in this manual are trademarks or registered trademarks of their
respective holders.

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 Chinese products

MANUFACTURED: JULY 1999 C
BROTHER CORP. (ASIA) LTD.
BROTHER BUJI NAN LING FACTORY
Gold Garden Industry, Nan Ling Village, Buji,
Rong Gang, Shenzhen, China.
This product complies with FDA radiation
performance standards, 21 CFR Subchapter J.

CHAPTER I.

GENERAL DESCRIPTION

CHAPTER I. GENERAL DESCRIPTION

CONTENTS

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

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

1.2 Components................................................................................................. 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 10.5 kg 14.0 kg

Machine (incl. drum unit & toner cartridge) 12.0 kg 15.5 kg
In package 16.5 kg 22.0 kg

1.2 Components

The equipment consists of the following major components:

w/o 2nd cassette w/ 2nd cassette

I - 1

*1 Provided on those models equipped

with a handset.

*2 Provided on those models without

handset.

2. SPECIFICATIONS

Model FAX4750 MFC8300
GENERAL

Print Engine Laser (ZL) Laser (ZL)
Modem Speed (bps) 14,400 (Fax) 14,400 (Fax)
Transmission Speed (sec.) 6 6
ITU-T Group G3 G3
Coding Method MH/MR/MMR MH/MR/MMR
Input/Output Width 5.8" to 8.5" x 2.75" to 8.5" 5.8" to 8.5" x 2.75" to 8.5"
ADF (pages) 30 (50 *1) 30
LCD Size 16 chars x 2 lines 16 chars x 2 lines
On-Screen Programming Yes Yes
Backup Clock Yes (1 hour) Yes (1 hour)
Memory Capacity (MB) 4 2
Backup Memory No No
Optional Memory Yes (8 & 16 MB) Yes (8 & 16 MB)
Color Gray 1495 Gray 1495
Standby Mode Yes Yes
PC-Fax Protocol Compliance Class 2 Class 2
Simultaneous Operation Yes Yes
Data Modem No No
Energy Star Compliance (for U.S.A.) Yes Yes
LCD Backlight No No
Operating Environment Temperature 10 to 32.5 °C 10 to 32.5 °C

Humidity 20 to 80% (without condensation) 20 to 80% (without condensation)
Power Source 120 VAC, 50/60Hz 120 VAC, 50/60Hz
Power Consumption (Sleep/Peak) Less than 9W/60W/850W Less than 9W/60W/850W

TELEPHONE

Automatic Redial Yes Yes
Handset Yes Yes
One-Touch Dial 32 (16 x 2) 32 (16 x 2)
Speed Dial 100 100
Telephone Index Yes Yes
Speaker Phone No No
Chain Dialing Yes Yes
Caller ID Yes Yes
Call Waiting Caller ID Yes Yes
Distinctive Ringing Yes Yes
Hold/Mute Key Yes Yes
Power Failure Dialing No No
Speaker Volume Yes (3 levels + OFF) Yes (3 levels + OFF)
Ringer Volume Yes (3 levels + OFF) Yes (3 levels + OFF)
Receiver Volume Yes (2 levels + Hearing amplify level) Yes (2 levels + Hearing amplify level)
PBX Feature No No
Transfer Method Flash Flash
Digits of One-Touch & Speed Dial 20 digits 20 digits
Registrable Number of Characters 15 chars 15 chars

(1/4)

*1Xerox 4200 (20 lb/LTR) in normal business environments

I - 2

Model MFC8600 MFC8700
GENERAL

Print Engine Laser (ZL) Laser (ZL)
Modem Speed (bps) 14,400 (Fax) 14,400 (Fax)
Transmission Speed (sec.) 6 Approx. 5
ITU-T Group G3 G3
Coding Method MH/MR/MMR MH/MR/MMR/JBIG
Input/Output Width 5.8" to 8.5" x 2.75" to 8.5" 5.8" to 8.5" x 2.75" to 8.5"
ADF (pages) 30 30 (50 Conditional *1)
LCD Size 16 chars x 2 lines 16 chars x 2 lines
On-Screen Programming Yes Yes
Backup Clock Yes (1 hour) Yes (1 hour)
Memory Capacity (MB) 4 4
Backup Memory No No
Optional Memory Yes (8 & 16 MB) Yes (8 & 16 MB)
Color Gray 1495 Gray 1495
Standby Mode Yes Yes
PC-Fax Protocol Compliance Class 2 Class 1 & 2
Simultaneous Operation Yes Yes
Data Modem No No
Energy Star Compliance (for U.S.A.) Yes Yes
LCD Backlight No No
Operating Environment Temperature 10 to 32.5 °C 10 to 32.5 °C

Humidity 20 to 80% (without condensation) 20 to 80% (without condensation)
Power Source 120 VAC, 50/60Hz 120 VAC, 50/60Hz
Power Consumption (Sleep/Peak) Less than 9W/60W/850W Less than 9W/60W/850W

TELEPHONE

Automatic Redial Yes Yes
Handset Yes Yes
One-Touch Dial 32 (16 x 2) 32 (16 x 2)
Speed Dial 100 100
Telephone Index Yes Yes
Speaker Phone No No
Chain Dialing Yes Yes
Caller ID Yes Yes
Call Waiting Caller ID Yes Yes
Distinctive Ringing Yes Yes
Hold/Mute Key Yes Yes
Power Failure Dialing No No
Speaker Volume Yes (3 levels + OFF) Yes (3 levels + OFF)
Ringer Volume Yes (3 levels + OFF) Yes (3 levels + OFF)
Receiver Volume Yes (2 levels + Hearing amplify level) Yes (2 levels + Hearing amplify level)
PBX Feature No No
Transfer Method Flash Flash
Digits of One-Touch & Speed Dial 20 digits 20 digits
Registrable Number Of Characters 15 chars 15 chars

(1/4)

*1Xerox 4200 (20 lb/LTR) in normal business environments

I - 3

Model FAX5750 FAX8350P
GENERAL

Print Engine Laser (ZL) Laser (ZL)
Modem Speed (bps) 33,600 (Fax) 14,400 (Fax)
Transmission Speed (sec.) Approx. 2 6
ITU-T Group Super G3 G3
Coding Method MH/MR/MMR/JBIG MH/MR/MMR
Input/Output Width 5.8" to 8.5" x 2.75" to 8.5" 5.8" to 8.5" x 2.75" to 8.5"
ADF (pages) 30 (50 *1) 30 (50 *1)
LCD Size 16 chars x 2 lines 16 chars x 2 lines
On-Screen Programming Yes Yes
Backup Clock Yes (1 hour) Yes (9 hours)
Memory Capacity (MB) 4 4 (RAM) + 2 (flash ROM)
Backup Memory No Yes
Optional Memory Yes (8 & 16 MB) Yes (2 or 4 MB: flash)
Color Gray 1495 Gray 1495
Standby Mode Yes Yes
PC-Fax Protocol Compliance Class 2 Class 2
Simultaneous Operation Yes Yes
Data Modem No No
Energy Star Compliance (for U.S.A.) Yes No
LCD Backlight No No
Operating Environment Temperature 10 to 32.5 °C 10 to 32.5 °C

Humidity 20 to 80% (without condensation) 20 to 80% (without condensation)
Power Source 120 VAC, 50/60Hz 220-240 VAC, 50/60Hz
Power Consumption (Sleep/Peak) Less than 9W/60W/850W Less than 7W/9W/60W/850W

TELEPHONE

Automatic Redial Yes Yes
Handset Yes No
One-Touch Dial 32 (16 x 2) 32 (16 x 2)
Speed Dial 100 100
Telephone Index Yes Yes
Speaker Phone No No
Chain Dialing Yes Yes
Caller ID Yes No
Call Waiting Caller ID No No
Distinctive Ringing Yes Yes
Hold/Mute Key Yes No
Power Failure Dialing No No
Speaker Volume Yes (3 levels + OFF) Yes (3 levels + OFF)
Ringer Volume Yes (3 levels + OFF) Yes (3 levels + OFF)
Receiver Volume Yes (2 levels + Hearing amplify level) N/A
PBX Feature No Yes
Transfer Method Flash Flash/Earth
Digits of One-Touch & Speed Dial 20 digits 20 digits
Registrable Number Of Characters 15 chars 15 chars

(1/4)

*1Xerox 4200 (20 lb/LTR) in normal business environments

I - 4

Model MFC9650 FAX8750P
GENERAL

Print Engine Laser (ZL) Laser (ZL)
Modem Speed (bps) 14,400 (Fax) 33,600 (Fax)
Transmission Speed (sec.) 6 Approx. 2
ITU-T Group G3 Super G3
Coding Method MH/MR/MMR MH/MR/MMR/JBIG
Input/Output Width 5.8" to 8.5" x 2.75" to 8.5" 5.8" to 8.5" x 2.75" to 8.5"
ADF (pages) 30 (50 *1) 30 (50 *1)
LCD Size 16 chars x 2 lines 16 chars x 2 lines
On-Screen Programming Yes Yes
Backup Clock Yes (9 hours) Yes (9 hours)
Memory Capacity (MB) 4 (RAM) + 2 (flash ROM) 4 (RAM) + 8 (flash ROM)
Backup Memory Yes Yes
Optional Memory Yes (2 or 4 MB: flash) N/A
Color Gray 1495 Gray 1495
Standby Mode Yes Yes
PC-Fax Protocol Compliance Class 1 & 2 Class 1 & 2
Simultaneous Operation Yes Yes
Data Modem No No
Energy Star Compliance (for U.S.A.)
LCD Backlight No No
Operating Environment Temperature 10 to 32.5 °C 10 to 32.5 °C

Humidity 20 to 80% (without condensation) 20 to 80% (without condensation)
Power Source 220-240 VAC, 50/60Hz 220-240 VAC, 50/60Hz
Power Consumption (Sleep/Peak) Less than 7W/9W/60W/850W Less than 7W/9W/60W/850W

TELEPHONE

Automatic Redial Yes Yes
Handset No No
One-Touch Dial 32 (16 x 2) 32 (16 x 2)
Speed Dial 100 100
Telephone Index Yes Yes
Speaker Phone No No
Chain Dialing Yes Yes
Caller ID No No
Call Waiting Caller ID No No
Distinctive Ringing Yes Yes
Hold/Mute Key No No
Power Failure Dialing No No
Speaker Volume Yes (3 levels + OFF) Yes (3 levels + OFF)
Ringer Volume Yes (3 levels + OFF) Yes (3 levels + OFF)
Receiver Volume N/A N/A
PBX Feature Yes Yes
Transfer Method Flash/Earth Flash/Earth
Digits of One-Touch & Speed Dial 20 digits 20 digits
Registrable Number Of Characters 15 chars 15 chars

(1/4)

*1Xerox 4200 (20 lb/LTR) in normal business environments

I - 5

(2/4)

Model FAX4750 MFC8300
FAX

Internet FAX N/A N/A
Easy Receive/Fax Detect Yes Yes
Fax/Tel Switch Yes Yes
Super Fine Yes (TX & RX) Yes (TX & RX)
300 dpi Transmission No No
Gray Scale 64 64
Contrast Yes (Auto/S.Light/S.Dark) Yes (Auto/S.Light/S.Dark)
Smoothing Yes Yes
Call Reservation Over Auto TX Yes Yes
Password Check No No
Enhanced Remote Activation Yes Yes
Multi-Resolution Transmission Yes Yes
Multi Transmission No No
Next-Fax Reservation Yes (Dual access) Yes (Dual access)
Delayed Timer Yes (Up to 50 timers or 50 jobs) Yes (Up to 50 timers or 50 jobs)
Polling Yes (Std/Seq) Yes (Std/Seq)
Quick Scan (Memory Transmission) Approx. 2 sec/page (A4, std. resolution) Approx. 2 sec/page (A4, std. resolution)
Broadcasting Yes (182 locations) Yes (182 locations)
Batch Transmission Yes Yes
Auto Reduction Yes Yes
Out-of-Paper Reception (Brother #1 Chart) Up to 270 pages Up to 90 pages
Dual Access Yes Yes
ECM (Error Correction Mode) Yes Yes
ITU SUB Addressing No No
Group Dial Yes (6) Yes (6)
Re-send After Receive Error Signal No No
Confidential No No
Station ID 1 (20 digits/20 characters) 1 (20 digits/20 characters)
Off-Hook Alarm No No
Remote Maintenance Yes Yes
Call Reservation Over Manual TX Yes Yes
RX Mode Indication LED LED
Resolution Indication LED LED

LIST REPORT

Activity Report/Journal Report Yes (up to 50) Yes (up to 50)
Transmission Verification Report Yes Yes
Coverpage Yes (Super) Yes (Super)
Help List Yes Yes
Callback Message Yes Yes
Caller ID List Yes Yes

INTERFACE

External TAD Interface Yes Yes
Missing Link/PC Interface No No
Host Interface Yes (Parallel) Yes (Auto switching : Parallel/USB*2)
LAN Interface No No

*2USB for Windows98 only

I - 6

(2/4)

Model MFC8600 MFC8700
FAX

Internet FAX N/A Available with optional LAN board
Easy Receive/Fax Detect Yes Yes
Fax/Tel Switch Yes Yes
Super Fine Yes (TX & RX) Yes (TX & RX)
300 dpi Transmission No No
Gray Scale 64 64
Contrast Yes (Auto/S.Light/S.Dark) Yes (Auto/S.Light/S.Dark)
Smoothing Yes Yes
Call Reservation Over Auto TX Yes Yes
Password Check No No
Enhanced Remote Activation Yes Yes
Multi-Resolution Transmission Yes Yes
Multi Transmission No No
Next-Fax Reservation Yes (Dual access) Yes (Dual access)
Delayed Timer Yes (Up to 50 timers or 50 jobs) Yes (Up to 50 timers or 50 jobs)
Polling Yes (Std/Seq) Yes (Std/Seq)
Quick Scan (Memory Transmission) Approx. 2 sec/page (A4, std. resolution) Approx. 2 sec/page (A4, std. resolution)
Broadcasting Yes (182 locations) Yes (182 locations)
Batch Transmission Yes Yes
Auto Reduction Yes Yes
Out-of-Paper Reception (Brother #1 Chart) Up to 270 pages Up to 310 pages
Dual Access Yes Yes
ECM (Error Correction Mode) Yes Yes
ITU SUB Addressing No No
Group Dial Yes (6) Yes (6)
Re-send After Receive Error Signal No No
Confidential No No
Station ID 1 (20 digits/20 characters) 1 (20 digits/20 characters)
Off-Hook Alarm No No
Remote Maintenance Yes Yes
Call Reservation Over Manual TX Yes Yes
RX Mode Indication LED LED
Resolution Indication LED LED

LIST REPORT

Activity Report/Journal Report Yes (up to 50) Yes (up to 50)
Transmission Verification Report Yes Yes
Coverpage Yes (Super) Yes (Super)
Help List Yes Yes
Call Back Message Yes Yes
Caller ID List Yes Yes

INTERFACE

External TAD Interface Yes Yes
Missing Link/PC Interface No No
Host Interface Yes (Auto switching : Parallel/USB*2) Yes (Auto switching : Parallel/USB*2)
LAN Interface No Available with optional LAN board (10-BaseT)

*2USB for Windows98 only

I - 7

(2/4)

Model FAX5750 FAX8350P
FAX

Internet FAX Available with optional LAN board N/A
Easy Receive/Fax Detect Yes Yes
Fax/Tel Switch Yes Yes
Super Fine Yes (TX & RX) Yes
300 dpi Transmission No No
Gray Scale 64 64
Contrast Yes (Auto/S.Light/S.Dark) Yes (Auto/Light/Dark)
Smoothing Yes Yes
Call Reservation Over Auto TX Yes Yes
Password Check No No
Enhanced Remote Activation Yes Yes
Multi-Resolution Transmission Yes Yes
Multi Transmission No No
Next-Fax Reservation Yes (Dual access) Yes (Dual access)
Delayed Timer Yes (Up to 50 timers or 50 jobs) Yes (Up to 50 timers or 50 jobs)
Polling Yes (Std/Seq) Yes (Std(+Seq)/Sec/Dil)
Quick Scan (Memory Transmission) Approx. 2 sec/page (A4, std. resolution) Approx. 2 sec/page (A4, std. resolution)
Broadcasting Yes (182 locations) Yes (182 locations)
Batch Transmission Yes Yes
Auto Reduction Yes Yes
Out-of-Paper Reception (Brother #1 Chart) Up to 310 pages -

(ITU-T Chart) - Up to 130 pages
Dual Access Yes Yes
ECM (Error Correction Mode) Yes Yes
ITU SUB Addressing No No
Group Dial Yes (6) Yes (6)
Re-send After Receive Error Signal No No
Confidential No No
Station ID 1 (20 digits/15 characters) 1 (20 digits/20 characters)
Off-Hook Alarm No No
Remote Maintenance Yes Yes
Call Reservation Over Manual TX Yes Yes
RX Mode Indication LED LED
Resolution Indication LED LED

LIST REPORT

Activity Report/Journal Report Yes (up to 50) Yes (up to 50)
Transmission Verification Report Yes Yes
Coverpage Yes (Super) Yes (Super)
Help List Yes Yes
Call Back Message Yes Yes
Caller ID List Yes No

INTERFACE

External TAD Interface Yes Yes
Missing Link/PC Interface No No
Host Interface Yes (Parallel) No*

3

LAN Interface Available with optional LAN board (10-BaseT) No

*3There is a parallel I/F behind the cover.

I - 8

(2/4)

Model MFC9650 FAX8750P
FAX

Internet FAX Available with optional LAN board Available with optional LAN board
Easy Receive/Fax Detect Yes Yes
Fax/Tel Switch Yes Yes
Super Fine Yes Yes
300 dpi Transmission No No
Gray Scale 64 64
Contrast Yes (Auto/Light/Dark) Yes (Auto/Light/Dark)
Smoothing Yes Yes
Call Reservation Over Auto TX Yes Yes
Password Check No No
Enhanced Remote Activation Yes Yes
Multi-Resolution Transmission Yes Yes
Multi Transmission No No
Next-Fax Reservation Yes (Dual access) Yes (Dual access)
Delayed Timer Yes (Up to 50 timers or 50 jobs) Yes (Up to 50 timers or 50 jobs)
Polling Yes (Std(+Seq)/Sec/Dil) Yes (Std(+Seq)/Sec/Dil)
Quick Scan (Memory Transmission) Approx. 2 sec/page (A4, std. resolution) Approx. 2 sec/page (A4, std. resolution)
Broadcasting Yes (182 locations) Yes (182 locations)
Batch Transmission Yes Yes
Auto Reduction Yes Yes
Out-of-Paper Reception (ITU-T Chart) Up to 130 pages Up to 460 pages
Dual Access Yes Yes
ECM (Error Correction Mode) Yes Yes
ITU SUB Addressing Yes (Wordcraft: MFL Pro:Class1 only) No
Group Dial Yes (6) Yes (6)
Re-send After Receive Error Signal No No
Confidential No No
Station ID 1 (20 digits/20 characters) 1 (20 digits/20 characters)
Off-Hook Alarm No No
Remote Maintenance Yes Yes
Call Reservation Over Manual TX Yes Yes
RX Mode Indication LED LED
Resolution Indication LED LED

LIST REPORT

Activity Report/Journal Report Yes (up to 50) Yes (up to 50)
Transmission Verification Report Yes Yes
Coverpage Yes (Super) Yes (Super)
Help List Yes Yes
Call Back Message Yes Yes
Caller ID List No No

INTERFACE

External TAD Interface Yes Yes
Missing Link/PC Interface No No
Host Interface Yes (Auto switching : Parallel/USB*2) Yes (Auto switching : Parallel/USB*2)
LAN Interface Available with option (LAN Board) Available with option (LAN Board)

*2USB for Windows98 only

I - 9

(3/4)

Model FAX4750 MFC8300
PRINTER Available with option or

download from Web Site

Yes

Color/Mono Mono Mono
Engine Type Laser (ZL) Laser (ZL)
Resolution (dpi) 600 x 600 600 x 600
Speed (ppm) 12 12
Paper Capacity (sheets) 250 250
Additional Paper Capacity (sheets) 250 (User option) N/A
Output Paper Capacity (sheets) 150 150
Standard Print Language Windows GDI (600 x 600) Windows GDI (600 x 600)
Emulation No PCL4
Resident Fonts No 24 bitmap (PCL4 Comp.)
Fonts Disk Based No Yes (35 True type)
Paper Handling Size LTR, LGL, A4, B5, A5, EXE LTR, LGL, A4, B5, A5, EXE
Manual Feed Slot Custom size (2.75 x 5 to 8.5 x 14)

Envelop (DL/C5/CM10/Mona)

Custom size (2.75 x 5 to 8.5 x 14)

Envelop (DL/C5/CM10/Mona)
Other Paper Type OHP, envelopes, labels, organizer OHP, envelopes, labels, organizer
Sheet Weight (Paper Cassette) 64 to 105 g/m2 (17 to 28 lb) 64 to 105 g/m2 (17 to 28 lb)

(Manual Slot) 64 to 157 g/m2 (17 to 43 lb) 64 to 157 g/m2 (17 to 43 lb)

Printer Driver Windows3.1x, 95/98 and NT4.0 Driver with

Auto Installer Program

Windows3.1x, 95/98 and NT4.0 Driver with

Auto Installer Program
Utility Software No Yes (Remote printer console for PCL4)
Toner Life (High Yield : TN-430) 6,000 pages (A4, @5%) 6,000 pages (A4, @5%)

(Standard Yield : TN-460) 3,000 pages (A4, @5%) 3,000 pages (A4, @5%)
Drum Life (DR400) Up to 20,000 pages Up to 20,000 pages
Interface Type Parallel Parallel & USB*

2

Bundled Cable No Yes (Parallel)

COPY

Color No No
Speed (ppm) Up to 12 Up to 12
Multi Copy (Stack) Up to 99 Up to 99
Multi Copy (Sort) Yes Yes
Reduction/Enlargement 50 to 200% in 1% increments 50 to 200% in 1% increments
Resolution (dpi) 300 x 600 300 x 600
SCANNER Available with Option Available with Option
Color/Mono Mono Mono
Resolution (dpi) 1,200 x 1,200 (Int.), 300 x 600 (Opt.) 1,200 x 1,200 (Int.), 300 x 600 (Opt.)
Gray Scale 256 256
TWAIN Compliant 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
OCR Yes (ScanSoft TextBridge) Yes (ScanSoft TextBridge)
MESSAGE CENTER/MESSAGE MANAGER No No
ICM Recording Time N/A N/A
Page Memory N/A N/A
OGM (MC/MC Pro/Paging) N/A N/A
TAD Type N/A N/A
Memo/Recording Conversation N/A N/A
Toll Saver N/A N/A

*2USB for Windows98 only

I - 10

(3/4)

Model MFC8600 MFC8700
PRINTER Yes Yes

Color/Mono Mono Mono
Engine Type Laser (ZL) Laser (ZL)
Resolution (dpi) 600 x 600 600 x 600
Speed (ppm) 12 12
Paper Capacity (sheets) 250 500 (250 + 250)
Additional Paper Capacity (sheets) 250 (User option) N/A
Output Paper Capacity (sheets) 150 150
Standard Print Language Windows GDI (600 x 600) Windows GDI (600 x 600)
Emulation PCL4 PCL4
Resident Fonts 24 bitmap (PCL4 Comp.) 24 bitmap (PCL4 Comp.)
Fonts Disk Based Yes (35 TrueType) Yes (35 TrueType)
Paper Handling Size LTR, LGL, A4, B5, A5, EXE LTR, LGL, A4, B5, A5, EXE
Manual Feed Slot Custom Size (2.75x5 to 8.5x14)

Envelop (DL/C5/CM10/Mona)

Custom Size (2.75x5 to 8.5x14)

Envelop (DL/C5/CM10/Mona)
Other Paper Type OHP, envelopes, labels, organizer OHP, envelopes, labels, organizer
Sheet Weight (Paper Cassette) 64 to 105 g/m2 (17 to 28 lb) 64 to 105 g/m2 (17 to 28 lb)

(Manual Slot) 64 to 157 g/m2 (17 to 43 lb) 64 to 157 g/m2 (17 to 43 lb)

Printer Driver Windows3.1x, 95/98 and NT4.0 Driver with

Auto Installer Program

Windows3.1x, 95/98 and NT4.0 Driver with

Auto Installer Program
Utility Software Yes (Remote printer console for PCL4) Yes (Remote printer console for PCL4)
Toner Life (High Yield : TN-430) 6,000 pages (A4, @5%) 6,000 pages (A4, @5%)

(Standard Yield : TN-460) 3,000 pages (A4, @5%) 3,000 pages (A4, @5%)
Drum Life (DR400) Up to 20,000 pages Up to 20,000 pages
Interface Type Parallel & USB*

2

Parallel & USB*

2

Bundled Cable Yes (Parallel) Yes (Parallel)

COPY

Color No No
Speed (ppm) Up to 12 Up to 12
Multi Copy (Stack) Up to 99 Up to 99
Multi Copy (Sort) Yes Yes
Reduction/Enlargement 50 to 200% in 1% increments 50 to 200% in 1% increments
Resolution (dpi) 300 x 600 300 x 600
SCANNER Yes Yes
Color/Mono Mono Mono
Resolution (dpi) 1,200 x 1,200 (Int.)/300 x 600 (Opt.) 1,200 x 1,200 (Int.)/300 x 600 (Opt.)
Gray Scale 256 256
TWAIN Compliant 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
OCR Yes (ScanSoft TextBridge) Yes (ScanSoft TextBridge)
MESSAGE CENTER/MESSAGE MANAGER No No
ICM Recording Time N/A N/A
Page Memory N/A N/A
OGM (MC/MC Pro/Paging) N/A N/A
TAD Type N/A N/A
Memo/Recording Conversation N/A N/A
Toll Saver N/A N/A

*2USB for Windows98 only

I - 11

Model FAX5750 FAX8350P
PRINTER Available with option or

download from Web Site

N/A

Color/Mono Mono Mono
Engine Type Laser (ZL) Laser (ZL)
Resolution (dpi) 600 x 600 600 x 600
Speed (ppm) 12 12
Paper Capacity (sheets) 500 (250+250) 250
Additional Paper Capacity (sheets) N/A 250 (User option)
Output Paper Capacity (sheets) 150 150
Standard Print Language Windows GDI (600 x 600) Windows GDI (600 x 600)
Emulation No No
Resident Fonts No No
Fonts Disk Based No No
Paper Handling Size LTR, LGL, A4, B5, A5, EXE LTR, A4, B5, A5, EXE
Manual Feed Slot Custom Size (2.75x5 to 8.5x14)

Envelop (DL/C5/CM10/Mona)

Custom Size (2.75x5 to 8.5x14)

Envelop (DL/C5/CM10/Mona)
Other Paper Type OHP, envelopes, labels, organizer OHP, envelopes, labels, organizer
Sheet Weight (Paper Cassette) 64 to 105 g/m2 (17 to 28 lb) 64 to 105 g/m2 (17 to 28 lb)

(Manual Slot) 64 to 157 g/m2 (17 to 43 lb) 64 to 157 g/m2 (17 to 43 lb)

Printer Driver Windows3.1x, 95/98 and NT4.0 Driver with

Auto Installer Program

N/A

Utility Software No No
Toner Life (High Yield : TN-430) 6,000 pages (A4, @5%) 6,000 pages (A4, @5%)

(Standard Yield : TN-460) 3,000 pages (A4, @5%) 3,000 pages (A4, @5%)
Drum Life (DR400) Up to 20,000 pages Up to 20,000 pages
Interface Type Parallel ---*

3

Bundled Cable No No

COPY

Color No No
Speed (ppm) Up to 12 Up to 12
Multi Copy (Stack) Up to 99 Up to 99
Multi Copy (Sort) Yes Yes
Reduction/Enlargement 50 to 200% in 1% increments 50 to 200% in 1% increments
Resolution (dpi) 300 x 600 300 x 600
SCANNER Available with option N/A
Color/Mono Mono --­Resolution (dpi) 1,200 x 1,200 (Int.)/300 x 600 (Opt.) --­Gray Scale 256 --­TWAIN Compliant Yes --­Formats (Import) TIFF/BMP/PCX/DCX/BTF/BTX/MAX/PDF --­Formats (Export) TIFF/BMP/MAX/PDF --­OCR Yes (ScanSoft TextBridge) --­MESSAGE CENTER/MESSAGE MANAGER No N/A
ICM Recording Time N/A N/A
Page Memory N/A N/A
OGM (MC/MC Pro/Paging) N/A N/A
TAD Type N/A N/A
Memo/Recording Conversation N/A N/A
Toll Saver N/A N/A

(3/4)

*3There is a parallel I/F behind the cover.

I - 12

(3/4)

Model MFC9650 FAX8750P
PRINTER Yes Yes

Color/Mono Mono Mono
Engine Type Laser (ZL) Laser (ZL)
Resolution (dpi) 600 x 600 600 x 600
Speed (ppm) 12 12
Paper Capacity (sheets) 250 250
Additional Paper Capacity (sheets) 250 (User option) 250 (User option)
Output Paper Capacity (sheets) 150 150
Standard Print Language Windows GDI (600 x 600) Windows GDI (600 x 600)
Emulation PCL4 PCL4
Resident Fonts 24 bitmap (PCL4 Comp.) 24 bitmap (PCL4 Comp.)
Fonts Disk Based Yes (35 True type) Yes (35 True type)
Paper Handling Size LTR, A4, B5, A5, EXE LTR, A4, B5, A5, EXE
Manual Feed Slot Custom Size (2.75x5 to 8.5x14)

Envelop (DL/C5/CM10/Mona)

Custom Size (2.75x5 to 8.5x14)

Envelop (DL/C5/CM10/Mona)
Other Paper Type OHP, envelopes, labels, organizer OHP, envelopes, labels, organizer
Sheet Weight (Paper Cassette) 64 to 105 g/m2 (17 to 28 lb) 64 to 105 g/m2 (17 to 28 lb)

(Manual Slot) 64 to 157 g/m2 (17 to 43 lb) 64 to 157 g/m2 (17 to 43 lb)

Printer Driver Windows3.1x, 95/98 and NT4.0 Driver with

Auto Installer Program

Windows3.1x, 95/98 and NT4.0 Driver with

Auto Installer Program
Utility Software Yes (Remote printer console for PCL4) No
Toner Life (High Yield : TN-430) 6,000 pages (A4, @5%) 6,000 pages (A4, @5%)

(Standard Yield : TN-460) 3,000 pages (A4, @5%) 3,000 pages (A4, @5%)
Drum Life (DR400) Up to 20,000 pages Up to 20,000 pages
Interface Type Parallel & USB*

2

Parallel & USB*

2

Bundled Cable No (up to country) No

COPY

Color No No
Speed (ppm) Up to 12 Up to 12
Multi Copy (Stack) Up to 99 Up to 99
Multi Copy (Sort) Yes Yes
Reduction/Enlargement 50 to 200% in 1% increments 50 to 200% in 1% increments
Resolution (dpi) 300 x 600 300 x 600
SCANNER Yes Available with option
Color/Mono Mono Mono
Resolution (dpi) 1,200 x 1,200 (Int.)/300 x 600 (Opt.) 1,200 x 1,200 (Int.)/300 x 600 (Opt.)
Gray Scale 256 256
TWAIN Compliant 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
OCR Yes (ScanSoft TextBridge) Yes (ScanSoft TextBridge)
MESSAGE CENTER/MESSAGE MANAGER N/A N/A
ICM Recording Time N/A N/A
Page Memory N/A N/A
OGM (MC/MC Pro/Paging) N/A N/A
TAD Type N/A N/A
Memo/Recording Conversation N/A N/A
Toll Saver N/A N/A

*2USB for Windows98 only

I - 13

Model FAX4750 MFC8300

Fax Forwarding Yes Yes
Fax Retrieval Yes Yes
Paging Yes Yes
Remote Access Yes Yes

MESSAGE CENTER Pro/MESSAGE
MANAGER Pro

No No

Fax & Voice Mail Box N/A N/A
Fax- & Voice-on-Demand N/A N/A
MESSAGE CENTER (PC MC) No No
Fax Forwarding N/A N/A
Paging N/A N/A
ICM Recording Time N/A N/A
OGM MC/MC Pro/Paging N/A N/A
Fax & Voice Mail Box N/A N/A
Fax- & Voice-on-Demand N/A N/A
VIDEO CAPTURE No No
Video Capture N/A N/A
Video Print N/A N/A
Video Format N/A N/A

BUNDLED SOFTWARE

For Windows
Printer Driver (Brother) Available with option Yes
Viewer (ScanSoft) Available with option Available with option
TWAIN (Brother) Available with option Available with option
PC Fax (SMSI)*

3

Available with option Available with option

(4/4)

For iMAC
Printer Driver (Brother) N/A Yes
Viewer (InfoWAVE) N/A N/A
TWAIN (TII) N/A N/A
PC Fax (SMSI or InfoWAVE) N/A N/A

*3The parallel interface only works.

I - 14

Model MFC8600 MFC8700

Fax Forwarding Yes Yes
Fax Retrieval Yes Yes
Paging Yes Yes
Remote Access Yes Yes

MESSAGE CENTER Pro/MESSAGE
MANAGER Pro

No No

Fax & Voice Mail Box N/A N/A
Fax- & Voice-on-Demand N/A N/A
MESSAGE CENTER (PC MC) No No
Fax Forwarding N/A N/A
Paging N/A N/A
ICM Recording Time N/A N/A
OGM MC/MC Pro/Paging N/A N/A
Fax & Voice Mail Box N/A N/A
Fax- & Voice-on-Demand N/A N/A
VIDEO CAPTURE Yes Yes
Video Capture Yes (Color) Yes (Color)
Video Print Yes (Mono) Yes (Mono)
Video Format NTSC NTSC

BUNDLED SOFTWARE

For Windows
Printer Driver (Brother) Yes Yes
Viewer (ScanSoft) Yes Yes
TWAIN (Brother) Yes Yes
PC Fax (SMSI)*

3

Yes Yes

(4/4)

For iMAC
Printer Driver (Brother) Yes Yes
Viewer (InfoWAVE) N/A N/A
TWAIN (TII) Yes Yes
PC Fax (SMSI or InfoWAVE) N/A N/A

*3The parallel interface only works.

I - 15

Model FAX5750 FAX8350P

Fax Forwarding Yes Yes
Fax Retrieval Yes Yes
Paging Yes N/A
Remote Access Yes N/A

MESSAGE CENTER Pro/MESSAGE
MANAGER Pro

No N/A

Fax & Voice Mail Box N/A N/A
Fax- & Voice-on-Demand N/A N/A
MESSAGE CENTER (PC MC) No N/A
Fax Forwarding N/A N/A
Paging N/A N/A
ICM Recording Time N/A N/A
OGM MC/MC Pro/Paging N/A N/A
Fax & Voice Mail Box N/A N/A
Fax- & Voice-on-Demand N/A N/A
VIDEO CAPTURE No N/A
Video Capture N/A N/A
Video Print N/A N/A
Video Format N/A N/A

BUNDLED SOFTWARE

For Windows
Printer Driver (Brother) Available with option N/A
Viewer (ScanSoft) Available with option N/A
TWAIN (Brother) Available with option N/A
PC Fax (SMSI)*

3

Available with option N/A

(4/4)

For iMAC
Printer Driver (Brother) Available with option N/A
Viewer (InfoWAVE) N/A N/A
TWAIN (TII) Available with option N/A
PC Fax (SMSI or InfoWAVE) N/A N/A

*3The parallel interface only works.

I - 16

Model MFC9650 FAX8750P

Fax Forwarding Yes Yes
Fax Retrieval Yes Yes
Paging N/A N/A
Remote Access N/A N/A

MESSAGE CENTER Pro/MESSAGE
MANAGER Pro

N/A N/A

Fax & Voice Mail Box N/A N/A
Fax- & Voice-on-Demand N/A N/A
MESSAGE CENTER (PC MC) N/A N/A
Fax Forwarding N/A N/A
Paging N/A N/A
ICM Recording Time N/A N/A
OGM MC/MC Pro/Paging N/A N/A
Fax & Voice Mail Box N/A N/A
Fax- & Voice-on-Demand N/A N/A
VIDEO CAPTURE N/A N/A
Video Capture N/A N/A
Video Print N/A N/A
Video Format N/A N/A

BUNDLED SOFTWARE

For Windows
Printer Driver (Brother) Yes (Wordcraft) Available with option
Viewer (ScanSoft) Yes (Wordcraft) Available with option
TWAIN (Brother) Yes (Brother) Yes (Brother)
PC Fax (SMSI)*

3

Yes (Brother) Available with option

(4/4)

For iMAC
Printer Driver (Brother) N/A N/A
Viewer (InfoWAVE) N/A N/A
TWAIN (TII) N/A N/A
PC Fax (SMSI or InfoWAVE) N/A N/A

*3The parallel interface only works.

I - 17

CHAPTER II.

INSTALLATION

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 PC/AT-compatible computer (which is capable of running MS­DOS or its compatible OS).

Connecting the facsimile 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.

II - 1

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

NOTE: The following is an installation procedure example on a PC that is running Windows 95/98.
(1) Copy the update data and transfer utility onto the desired directory of the hard disk.

e.g., C:\UPDATE
(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. In the above

example, type C:\ from the command line and press the ENTER key.

Then type CD UPDATE 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:

ICEN filename /b

Then press the ENTER key.

During downloading, the equipment beeps intermittently.

Upon completion of the downloading, the equipment beeps continuously.

NOTE: If the facsimile equipment cannot return to the standby state after completion of

downloading, turn the power off and on.

II - 2

CHAPTER III.

THEORY OF OPERATION

CHAPTER III. THEORY OF OPERATION

CONTENTS

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

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

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

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

2.1.2 Scanner ................................................................................................ III-3

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

2.2.1 Paper pick-up and registration mechanism............................................ III-4

2.2.2 Print process mechanism...................................................................... III-5

(1) Charging process .......................................................................... III-6

(2) Exposing process ......................................................................... III-6

(3) Developing process ...................................................................... III-7

(4) Transferring process..................................................................... III-7

2.2.3 Heat-fixing mechanism .......................................................................... III-8

2.2.4 Paper ejecting mechanism..................................................................... III-9

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

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

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

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

3.3 Engine PCB................................................................................................. III-15

3.4 NCU PCB.................................................................................................... III-16

3.5 Control Panel PCB...................................................................................... III-19

3.6 Power Supply PCB ...................................................................................... III-20

[ 1 ] Low-voltage power supply PCB.................................................... III-20

[ 2 ] High-voltage power supply PCB................................................... III-21

1. OVERVIEW

III - 1

*Not provided on those models without handset.

2. MECHANISMS

The facsimile equipment is classified into the following mechanisms:

n SCANNER MECHANISM - Document feeding and ejecting mechanism

n LASER PRINTING MECHANISM - Paper pick-up and registration mechanism

n SENSORS AND ACTUATORS

- Document scanning mechanism

- Print process mechanism (consisting of charging,
exposing, developing, and transferring processes)
with paper feeding mechanism

- Heat-fixing mechanism with paper feeding
mechanism

- Paper ejecting mechanism

III - 2

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 document take-in roller ASSY, nip­related parts, separation roller ASSY, 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 pick-up and registration mechanism

At the 1st stage, the controller drives the main motor without energizing the solenoid so that the
paper feed roller simply idles.

At the 2nd stage, the controller energizes the solenoid so that the paper feed roller no longer
rotates and the paper pick-up roller starts rotating to pick up paper into the equipment, a sheet at a
time. After the leading edge of the pulled-in paper passes through the manual insertion sensor
actuator, the paper is further fed for the specified time length. Accordingly, the leading edge will
reach the paper feed roller where the paper skew will be eliminated.

At the 3rd stage, the controller deenergizes the solenoid to rotate the paper feed roller for feeding
paper to the transfer block in the drum unit.

When the leading and trailing edges of the paper pass through the registration sensor actuator, the
sensor signals them to the controller. According to those signals, the controller may determine the
first print position on the paper.

III - 4

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 four
processes: charging, exposing, developing, and transferring processes.

III - 5

(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. 870V which is kept by the
voltage regulator 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 - 6

(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 agitator (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 controller negatively charges
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.

Cleaning the transfer roller
In the transferring process, the transfer roller may be contaminated with toner since not all the

toner particles on the drum are transferred onto the paper but some toner particles will remain on
the drum and will be transferred from the drum to the transfer roller. If paper jam or other errors
occur, the toner image fails to stick to the paper and will stick to the transfer roller.

To repulse this toner, the controller positively charges the transfer roller. The toner returns from
the transfer roller to the drum. During non-printing rotation of the drum, the toner particles on the
drum will be returned to the chamber through the developer roller.

III - 7

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.

The controller monitors the internal resistance of the heater thermistor to keep the surface
temperature of the heater roller constant by turning the halogen heater lamp on and off.

III - 8

2.2.4 Paper ejecting mechanism

After the paper passes through the heat-fixing process, it will be ejected from the heat-fixing unit
by the paper ejection roller.

If the leading edge of the paper pushes up the actuator of the paper ejection sensor, the sensor
signals the start of paper ejection. If the trailing edge has passed through the sensor actuator, the
sensor signals the completion of paper ejection.

The paper will be turned over along the outer chute and ejected onto the main cover by the exit
roller.

III - 9

2.3 Sensors and Actuators

This equipment has eleven sensors: eight photosensors, two thermistors and a mechanical switch
as described below.

Sensor name Type Located on

Document front sensor Photosensor Control panel PCB
Document rear sensor Photosensor Document sensor PCB

Control panel
PCB ASSY

Manual insertion sensor Photosensor Engine PCB
Registration sensor Photosensor Engine PCB
Cassette sensor Photosensor Engine PCB
Paper ejection sensor Photosensor Paper ejection sensor PCB
Toner sensor Photosensor Toner sensor (LED) PCB and toner

sensor (light-receiver) PCB
Cover sensor Photosensor Toner sensor (LED) PCB
Heater thermistor Thermistor Heat-fixing unit
In-casing temperature sensor Thermistor Left-hand plate of the main chassis
Hook switch* Mechanical switch Hook switch PCB*

*For models equipped with a handset

• 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.

• Manual insertion sensor which detects whether paper is inserted manually through the paper
slot or whether paper fed through the paper cassette has jammed.

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

• Cassette sensor which detects whether the paper cassette is loaded.

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

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

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

• Heater thermistor which allows the controller to monitor the temperature of the heater roller of
the fixing unit.

• In-casing temperature sensor which allows the controller to monitor the temperature inside the
equipment.

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

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

III - 10

* Provided on models equipped with a handset.

Location of Sensors and Actuators

III - 11

3. CONTROL ELECTRONICS

3.1 Configuration

The hardware configuration of the facsimile equipment is shown below.

*1Provided on models supporting LAN interface.
*2Provided on models supporting video capture.
*3Provided on models equipped with a handset.
*4Provided on models available with a 2nd paper cassette (as an option or standard).
*5Provided on European models.

Configuration of Facsimile Equipment

III - 12

3.2 Main PCB

The main PCB, which is the nucleus controlling the entire operation of the equipment, consists of a
FAX engine (ASIC), memories, MODEM, motor drive circuitry, sensor detection circuitry, and
analog circuits for scanning, printing, and power transmission shifting.

EEPROM:Electrically Erasable Programmable Read-only Memory
DRAM: Dynamic Random Access Memory

*1Provided on models supporting LAN interface.
*2Provided on models supporting video capture.
*3Provided on models equipped with a handset.

Block Diagram of Main PCB

III - 13

Main PCB

III - 14

3.3 Engine PCB

On the engine PCB is a gate array which converts serial signals sent from the main PCB into
parallel signals. According to those signals, the engine PCB controls the following:

- Motors--main motor, fan motor, and polygon motor

- High-voltage power supply

- Solenoid(s)

- Heater

- Heater thermistor

- Sensors--cover sensor, toner sensor, manual insertion sensor, registration sensor(s), and

cassette sensor(s)

III - 15

3.4 NCU PCB

The NCU PCB switches the communications line to telephone or built-in MODEM, under the
control of the main PCB.

US versions

III - 16

European versions

III - 17

Asian/Oceanian versions

III - 18

3.5 Control Panel PCB

The control panel PCB and the main PCB communicate with each other by serially transmitting
commands and data.

The control panel unit consists of a gate array, an LCD and LEDs, which are controlled by the gate
array according to commands issued from the FAX engine on the main PCB.

The panel FPC is a flexible keyboard PCB which integrates the key matrix having rubber keytops.

Control Panel PCB and its Related Circuit

III - 19

3.6 Power Supply PCB
[ 1 ] Low-voltage power supply PCB

The low-voltage power supply uses the switching regulation system to generate DC power (+5V
and +24V) from a commercial AC power supply for the driver circuits. The +5V source is fed to
the logic, control panel, sensors, CIS unit, etc. The 24V source is fed to the motors, solenoid, fan,
and high-voltage power supply PCB.

The low-voltage power supply also feeds AC power to the heater of the heat-fixing unit.

Low-voltage Power Supply Circuit

III - 20

[ 2 ] High-voltage power supply PCB

This power supply generates high-voltage power sources from the 24V source fed from the low­voltage power supply for charging, developing, and transferring in the laser printing process.

High-voltage Power Supply Circuit

III - 21

CHAPTER IV.

DISASSEMBLY/REASSEMBLY AND

LUBRICATION

CHAPTER IV. DISASSEMBLY/REASSEMBLY AND

LUBRICATION

CONTENTS

1. DISASSEMBLY/REASSEMBLY........................................................................... IV-1

n Safety Precautions.............................................................................................. IV-1

n Preparation......................................................................................................... IV-2

n How to Access the Object Component................................................................ IV-2

n Disassembly Order Flow..................................................................................... IV-3

1.1 Rear Cover..................................................................................................... IV-4

1.2 Access Plates R and F ................................................................................... IV-4

1.3 Control Panel ASSY....................................................................................... IV-5

1.4 Panel Rear Cover and Control Panel .............................................................. IV-6

1.5 Document Feed Roller ASSY, Document Ejection Roller ASSY,

and Pinch Rollers........................................................................................... IV-9

1.6 CIS Unit ......................................................................................................... IV-10

1.7 Scanner Frame ASSY (Scanner Motor, Scanner Drive Unit,

Document Take-in Roller, Separation Roller, Pressure Rollers,

and Control Panel Locks) ............................................................................... IV-11

1.8 Top Cover (Exit Roller, Speaker, and Document Guides)............................... IV-15

1.9 Handset Mount and Hook Switch PCB (for models equipped with a handset)

Side Cover (for models without handset)............................................................ IV-21

1.10 Paper Sub Tray.............................................................................................. IV-23

1.11 VC Cover, VC Bracket, and VC Connector PCB

(for models supporting video capture).................................................................. IV-24

1.12 Front Cover

Front Sub Cover (for models not supporting video capture) .................................. IV-25

1.13 Outer Chute and Paper Pinch Rollers ............................................................. IV-26

1.14 Main Cover..................................................................................................... IV-27

1.15 Switch Cover.................................................................................................. IV-28

1.16 Laser Unit....................................................................................................... IV-29

1.17 Heat-fixing Unit and FU Lamp........................................................................ IV-30

1.18 Fan................................................................................................................. IV-34

1.19 Drive Gear ASSY and Main Motor ASSY........................................................ IV-36

1.20 NCU Shield and NCU PCB............................................................................. IV-38

1.21 Bottom Plate, Main PCB and Bottom Insulation Film ...................................... IV-40

1.22 Low-voltage Power Supply PCB and Power Inlet ............................................ IV-44

1.23 Inner Insulation Film, High-voltage Power Supply PCB, Engine PCB,

and 2nd Cassette Relay PCB*........................................................................ IV-46

i

1.24 Toner Sensor (light-receiver) PCB and Toner Sensor (LED) PCB................... IV-48

1.25 Gears and Paper Pick-up Roller..................................................................... IV-49

1.26 Paper Feed Roller ASSY................................................................................ IV-50

1.27 Clutch Levers, Cassette Guide L, and Solenoid .............................................. IV-51

1.28 Paper Cassette............................................................................................... IV-52

1.29 Cleaning of High-voltage Contacts and Grounding Contacts........................... IV-53

2. LUBRICATION ..................................................................................................... IV-55

[ 1 ] Document feed roller ASSY and document ejection roller ASSY............. IV-55

[ 2 ] Control panel locks................................................................................. IV-56

[ 3 ] Scanner frame ASSY, document take-in roller and its shaft, and

separation roller and its shaft.................................................................. IV-56

[ 4 ] Top cover............................................................................................... IV-57

[ 5 ] Drive gear ASSY.................................................................................... IV-58

[ 6 ] Paper cassette........................................................................................ IV-59

ii

1. DISASSEMBLY/REASSEMBLY

nn Safety Precautions

To prevent the creation of secondary problems by mishandling, observe the following precautions
during maintenance work.

(1) Unplug the power cord from the power outlet before accessing parts or units inside the

machine. When having access to the power supply, be sure to unplug the power cord from
the power outlet.

(2) When servicing the optical system of the laser printing unit, be careful not to place

screwdrivers or other reflective objects in the path of the laser beam. Be sure to take off any
personal accessories such as wrist watches and rings before working on the printer. A
reflected beam, though invisible, can permanently damage your eyes.

(3) If the equipment has been printing, allow the heat-fixing unit (inside this unit is a red-colored

heater roller) sufficient time to cool down before starting maintenance jobs. It is HOT!
(4) Be careful not to lose screws, washers, or other parts removed for parts replacement.
(5) Do not remove gears from the document feed roller ASSY or document ejection roller ASSY if

at all possible. Once removed, they will become unusable and new gears will have to be put

back in.
(6) When using soldering irons and other heat-generating tools, take care not to damage the resin

parts such as wires, PCBs, and covers.
(7) Before handling the PCBs, touch a metal portion of the equipment to discharge static

electricity; otherwise, the electronic parts may be damaged due to the electricity charged in

your body.
(8) When transporting PCBs, be sure to wrap them in conductive sheets such as aluminum foil.
(9) Be sure to reinsert self-tapping screws correctly, if removed. Unless otherwise specified,

tighten screws to the following torque values:

Taptite, bind B and cup B M3: 0.7 N•m

M4: 0.8 N•m
Taptite, cup S M3: 0.8 N•m
Other screws M3: 0.7 N•m

M4: 0.8 N•m

(10) When connecting or disconnecting cable connectors, hold the connector bodies not the

cables. If the connector has a lock, always slide the connector lock to unlock it.

(11) Before reassembly, apply the specified lubricant to the specified points. (Refer to Section 2 in

this chapter.)

(12) After repairs, check not only the repaired portion but also that the connectors and other

related portions function properly before operation checks.

IV - 1

nn Preparation

Prior to proceeding to the disassembly procedure,
(1) Unplug

- the power cord,

- the modular jack of the telephone line,

- the modular jack of the curled cord (and remove the handset)*,

- the PC interface cable, and

- the modular jack of an external telephone set if connected. (Not shown below.)

(2) Remove

- the document support,

- the document tray,

- the paper cassette, and

- the drum unit (with toner cartridge loaded)

nn How to Access the Object Component

• On the next page is a disassembly order flow which helps you access the object components.
To remove the heat-fixing unit, for example, first find it on the flow and learn its number ( in
this case). You need to remove parts numbered , , , , , and so as to access
the heat-fixing unit.

• Unless otherwise specified, the disassembled parts or components should be reassembled in
the reverse order of removal.

(*For those models equipped with handset.)

IV - 2

nn Disassembly Order Flow

IV - 3

1.1 Rear Cover

(1) FAX8350P and FAX8750P: Remove the sub rear cover.
(2) Remove the three screws (two "a" and one "b") from the rear cover. Screw "b" is provided on

those models available with a 2nd paper cassette (as an option or standard).

(3) Lightly pressing sections "X," pull out the rear cover.

1.2 Access Plates R and F

(1) Remove screw "c" that secures access plates R and F together to the main chassis.
(2) Remove screws "d" and "e" from access plate R.
(3) Take out access plates R and F together.
(4) Remove screw "f" to separate those access plates.

"a" and "b": Screw, pan (washer) M4x10DB

nn Reassembling Notes

• When reinstalling access plate F, fit the two tabs provided on the front end underneath the
center edge of the main chassis.

"c," to "f": Taptite, cup S M3x6

(Tightening torque: 0.5 N•m)

IV - 4

1.3 Control Panel ASSY

(1) Slightly open the control panel ASSY.
(2) Push the right and left arms of the control panel ASSY outwards (in the direction of arrow •)

with your thumbs, then open the control panel ASSY further (arrow ‚ to unhook those arms
from bosses "x" provided on the scanner frame ASSY) while sliding the control panel ASSY to
the front (arrow ƒ to release its bosses "y" from the grooves of the scanner frame ASSY).

(3) Slightly lift up the control panel ASSY and disconnect the panel-main harness from the control

panel PCB.

IV - 5

1.4 Panel Rear Cover and Control Panel

(1) Place the control panel ASSY upside down.

If you do not need to remove the ADF parts, nip-related parts, document pressure bar, or

document rear sensor actuator, or anti-static brush, skip to step (7).
(2) To remove the ADF parts (spring plates, separation rubber and spring), remove the screw.
(3) To remove the nip-related parts (nip piece and spring), push down the nip piece (arrow •) and

then press either side of the piece inwards (arrow ‚).

(4) To remove the document pressure bar, press either of supports "a" provided on the panel rear

cover inwards and then lift the pressure bar up and towards the rear to release the three tabs

from the cutouts provided in the panel rear cover. The spring also comes off.
(5) To remove the document rear sensor actuator, pull support "b" on the panel rear cover

outwards.
(6) To replace the anti-static brush, peel it off.

NOTE: Once removed, it will become unusable and a new part will have to be put back in.

IV - 6

(7) Remove the two screws from the panel rear cover.
(8) Unhook the panel rear cover from eight "X" latches provided on the control panel and lift up

the panel rear cover.
(9) Fully turn the document front sensor actuator to the rear and take it out.
(10) Unhook the document sensor PCB from two "Y" latches.
(11) Unhook the control panel PCB from three "Z" latches.
(12) Slightly lift up the control panel PCB, then unlock the LCD cable connector and disconnect

the LCD flat cable. Next, unlock the FPC key connector and disconnect the FPC key.

IV - 7

(13) As shown below, slightly pull the clamps to the front and take out the LCD while pulling the

LCD flat cable gently.
NOTE: Do not take out the LCD except when the LCD is defective and requires replacement.

nn Reassembling Notes

• Before reinstalling the LCD to the control panel, wipe fingerprints or dust off the LCD surface

and control panel window with a soft cloth.

• A new LCD is covered with a protection sheet. Before installing it, remove the protection sheet.

IV - 8

1.5 Document Feed Roller ASSY, Document Ejection Roller ASSY, and Pinch Rollers

(1) Lightly push arm rib "a" to the rear, then pull the document feed roller ASSY to the left and

upwards.

(2) Lightly push arm rib "b" to the rear, then pull the document ejection roller ASSY to the left and

upwards.
NOTE: Take care not to break the arm ribs. They may easily break.
(3) Pull up the pinch rollers and their shafts (springs).

IV - 9

1.6 CIS Unit

(1) Lightly pull up the arm, move the CIS unit to the right, and lift up the left edge of the CIS unit

(2) While holding up the CIS unit, disconnect the CIS harness. The CIS springs also come off.

gently.

NOTE: Do not lift up the left edge exceeding 30 mm to prevent the CIS harness connector on

the CIS unit from getting broken.

nn Reassembling Notes

• When reinstalling the CIS unit, first connect the CIS harness, insert the right end under the arm

of the scanner frame, put the CIS unit into the scanner frame, and then move it to left.

IV - 10

1.7 Scanner Frame ASSY (Scanner Motor, Scanner Drive Unit, Document Take-in Roller,
Separation Roller, Pressure Rollers, and Control Panel Locks)

(1) Remove the two screws from the scanner frame ASSY.
(2) Lift up the front edge of the scanner frame ASSY and pull the ASSY towards you to release

the three tabs provided on the rear end from the top cover.
NOTE: If the CIS unit is mounted, do not lift up the scanner frame ASSY exceeding 30 mm

to prevent the CIS harness connector on the CIS unit from getting broken.

(3) Hold up the ASSY and disconnect the scanner motor harness (and the CIS harness if the CIS

is mounted).

IV - 11

(4) Turn the scanner frame ASSY upside down.
(5) Remove the screw from the scanner motor and turn the motor (as shown below) to release it

from the latch.

(6) Remove the two screws and take off the scanner drive unit.

IV - 12

(7) Remove the document take-in roller gear (in the direction of arrow •) by pulling its pawls

outwards. Slightly push down the arm (arrow ‚) and shift the document take-in roller shaft to
the left (arrow ƒ) and take it up.

Then shift the document take-in roller to the left and take it up.

(8) Remove the separation roller gear (in the direction of arrow •) by pulling its pawls outwards.

Slightly push down the arm (arrow ‚) and shift the separation roller shaft to the left (arrow ƒ)
and take it up.

Then shift the separation roller to the left and take it up.

(9) Remove the two pressure roller leaf springs by pulling them in the direction of arrows • and

‚ in this order as shown below. Then remove the pressure rollers and shaft.

(10) Remove the two control panel locks (leaf springs) with a flat screwdriver in the direction

shown below.

IV - 13

nn Reassembling Notes

• The document take-in roller and separation roller are compatible with each other. Their gears
are also compatible with each other. However, their shafts are not compatible. The document
take-in roller shaft should be a white one; the separation roller shaft should be a black one.

When setting these shaft to their rollers, fit the groove provided in each shaft over the longer
boss provided on each roller.

• When reinstalling the scanner motor, fit it in the latch provided on the scanner frame with the
connector facing up and then secure it with the screw. (See page IV-12.)

• When setting the scanner frame ASSY back into place, be sure to

- route the scanner motor harness through the hook on the top cover as shown on page IV-11

and connect it to the scanner motor,

- route the CIS harness through the hook on the top cover as shown on page IV-11 and connect

it to the CIS unit (if the CIS unit is not mounted, route the CIS harness through the left-hand
cutout provided in the scanner frame ASSY), and

- route the panel-main harness through the right-hand cutout provided in the scanner frame

ASSY.

IV - 14

1.8 Top Cover (Exit Roller, Speaker, and Document Guides)

(1) Disconnect the hook switch harness* and speaker harness from the main PCB.

*For models equipped with a handset

(2) Remove the harness support rubbers to release the hook switch harness*.
(3) Release the scanner motor harness and CIS harness from the hooks provided on the top

cover.

IV - 15

(4) Remove two screws "a."
(5) Open the front cover and remove two screws "b."
(6) Pull the tabs of the top cover to the front and upwards (in the direction of arrows •) to release

them from the bosses provided on the main cover.

(7) Insert the tip of a flat screwdriver and unhook the latches of the top cover (in the direction of

arrows ‚), then lift up the top cover (arrow ƒ).

IV - 16

”a": Stepped screw
"b": Taptite, cup S M3x10

*For models equipped with a handset

(8) Turn the top cover upside down.
(9) Peel off anti-static brushes.

NOTE: Once removed, they will become unusable and new parts will have to be put back in.

(10) As shown below, warp the gear-equipped end of the exit roller and remove it.

(11) Unhook the latch from the speaker spring and pull it up. (To make this easier, insert the tip of

a flat screwdriver from the bottom of the top cover placed upside down.) Lift up the speaker.

IV - 17

(12) Remove the screw from the inside of the top cover, then remove the document guides L and

R as shown below.

nn Reassembling Notes

• When reinstalling the paper guides, set them into place, pull them outwards (in the direction of
arrows •), and then secure them with the spring, guide gear, and screw (arrow ‚).

IV - 18

*For models equipped with a handset

• When setting the top cover back into place:

- at the right-hand side, put the speaker harness and hook switch harness* into square cutout

"X" provided in the right rear corner of the main cover. Raise the panel-main harness coming
through the main cover up and through cutout "x" provided in the top cover (through which
the hook switch harness* passes).

If the panel-main harness has been taken out from the machine, first put it into square cutout
"X" with the core-equipped end down and then raise its upper end up and through cutout "x"
provided in the top cover.

- at the left-hand side, pull up the scanner motor harness and CIS harness and raise them up

and through square and round cutouts ("y" and "z") provided in the top cover, respectively.
If the scanner motor harness or CIS harness has been taken out from the machine, first put it

into the respective cutout ("Y" or "Z") provided in the left rear corner of the main cover with
the core-equipped end down and then raise its upper end up and through the respective
cutout "y" or "z."

*For models equipped with a handset

IV - 19

• When connecting the speaker harness and hook switch harness* to the main PCB:

- route the hook switch harness* through the ferrite core of the speaker harness,

- make sure that the panel-main harness, speaker harness, and hook switch harness* are

routed through the cutout provided in the bottom insulation film, and

- make sure that the ferrite cores of the pane-main harness and speaker harness lie inside the

bottom insulation film.

IV - 20

1.9 Handset Mount and Hook Switch PCB (for models equipped with a handset)
Side Cover (for models without handset)

(1) Remove the two screws from the handset mount* or side cover**.
(2) Twist the handset mount* or side cover** so that it tilts over to the left and its upper end works

out of the bosses provided on the top cover.

IV - 21

The following steps should apply to those models equipped with a handset:
(3) Disassemble the handset mount by unhooking two latches "a" of the upper handset mount

with a flat screwdriver.
(4) Remove the hook switch PCB ASSY by unhooking latch "b."
(5) Disconnect the hook switch harness from the hook switch PCB.

nn Reassembling Notes

• When assembling the upper and lower handset mounts, route the hook switch harness

underneath the hook switch PCB and through the cutout as shown above. Take care not to
pinch the harness between the upper and lower mounts.

• Make sure that the hook switch harness is routed along the guides on the top cover.

IV - 22

1.10 Paper Sub Tray

(1) Turn the paper sub tray up (in the direction of arrow •).
(2) Warp the sub tray and lift it up (arrows ‚ and ƒ).

IV - 23

1.11 VC Cover, VC Bracket, and VC Connector PCB (for models supporting video capture)

(1) Remove two screws ("a" and "b"), then take off the VC cover.
(2) Remove screw "c," take out the VC bracket together with the VC connector PCB, and

disconnect the VC harness.
(3) Remove two screws "d," then take off the VC connector PCB.

nn Reassembling Notes

• The routing of the VC harness is shown on page IV-27.

"a": Taptite, cup S M3x10
"b": Taptite, bind S M3x8
"c" and "d": Taptite, cup S M3x6

IV - 24

1.12 Front Cover
Front Sub Cover (for models not supporting video capture)

(1) For models not supporting video capture:

Remove the screw and take off the front sub cover from the front cover.

(2) Remove the screw from the left bottom of the front side of the main cover.
(3) Hold the front cover at an angle of 45° and pull the front cover link to the left to release it from

the front cover.

(4) Pull the bottom left front corner of the main cover to the left (in the direction of arrow •) and

release the front cover from the boss provided on the main cover (arrow ‚).

IV - 25

1.13 Outer Chute and Paper Pinch Rollers

(1) Pull up the outer chute and open it (in the direction of arrow •).
(2) Remove the chute springs from the hooks provided on the main cover (arrow ‚), then lift up

the outer chute (arrow ƒ).

(3) Remove the paper pinch rollers, their supports, and their springs.

IV - 26

1.14 Main Cover

(1) Remove two screws "a" from the front side of the main cover.
(2) Remove two screws "b" from the rear side of the main cover, and then pull corner edges "X"

outwards to dislocate the main cover from the main chassis. Make sure that the cutout
provided in the main cover is dislocated from the power inlet.

(3) Unhook the two latches with the tip of a flat screwdriver, then lift up the main cover.

nn Reassembling Notes

• When reinstalling the main cover, route the panel-main harness, CIS harness, and scanner
motor harness through the respective cutouts provided in the main cover, as illustrated above.

"a" and "b": Taptite, bind S M3x8

IV - 27

1.15 Switch Cover

(1) Push the locks of the switch cover as shown below and remove it.

IV - 28

1.16 Laser Unit

(1) Remove screw "a" and take off the harness cover.
(2) Remove two screws "b."
(3) Disconnect the polygon motor harness and laser flat cable from the laser unit.
(4) Lift up the laser unit.

NOTE: When handling the laser unit, take care not to touch the inside of the unit, glass, or
mirror.

NOTE: On the small PCB in the laser unit is a 2-pin connector which is for the adjustment in
the factory. Do not disturb it.

nn Reassembling Notes

• Before putting the laser unit back into place, check for any toner particles, paper dust or dirt,
and clean them out.

• After routing the polygon motor harness and laser flat cable, tape them onto the laser unit as
shown above.

"a" and "b": Taptite, cup S M3x16

IV - 29

1.17 Heat-fixing Unit and FU Lamp

(1) Remove the screw from the harness duct.
(2) Peel off tape and take off the scanner motor harness, CIS harness, and VC harness* from the

harness duct.

(3) Unhook the harness duct from the main chassis in the directions of arrows • and ‚.

*Provided on models supporting video capture

IV - 30

(4) Remove three screws (two "a" and one "b").
(5) Disconnect the long heater wire (of the heater harness) from the upper center of the heat-

fixing unit.

(6) Disconnect the short heater wire (of the heater harness) from the left end of the heat-fixing

unit.

(7) Lift up the heat-fixing unit and disconnect the heater thermistor harness from the engine PCB.

IV - 31

"a": Stepped screw
"b": Taptite, cup S M3x8

(8) To take out the FU lamp from the heat-fixing unit, remove two screws "c."
(9) Unhook the two latches outwards (in the direction of arrows •) with the tip of a flat

screwdriver and open the upper cover (arrow ‚). The upper and lower covers will become

separated from each other.
(10) Loosen screw "d" (arrow ƒ).
(11) Remove screw "e," slightly lift up the heater roller gear (arrow „), hold the lock plate L of the

FU lamp between your fingers, and pull out the FU lamp from the heater roller (arrow …).

CAUTION: Do not touch the FU lamp. If you have touched it, clean it thoroughly with

alcohol.

nn Reassembling Notes

• When setting the FU lamp into the heat-fixing unit, be sure to insert the right end of the wire

into the lock plate R as illustrated above.

"c": Taptite, cup B M3x20
"d": Pan cup M3x6
"e": Taptite, pan M3x10DB

IV - 32

• When securing the lock plate R with screw "d," be sure to use the plastic jig as shown below to

avoid damaging the edge of the FU lamp with a screwdriver.

Lock plate R

FU lamp

"d"

Plastic jig

• A new heat-fixing unit will be provided with the heater thermistor harness being taped to the

unit. Before installing the unit, remove the tape.

• When setting the heat-fixing unit back into place, make sure that the heater wires are routed

through the latch of the fan duct (see the illustration given on page IV-34) and then route the
long heater wire as shown below.

• If you remove and reinstall the heat-fixing unit because of any failure, make the equipment

enter the maintenance mode (by pressing the Function/Menu, * 2, 8, 6, and 4 keys) after
completion of reassembly and then make it exit from the mode (by pressing the 9 key twice).
Otherwise, the heat-fixing unit may not become energized because of the following reason:

If the failure of the heat-fixing unit is caused by an opening of the thermistor circuit (that senses
the temperature of the heat-fixing unit), the system misinterprets the hot heater as being cold.
As a result, the temperature of the heat-fixing unit may become excessively high. To prevent
the system from heating the hot heater further at the next powering-on, it is designed so that
the heater will not be energized. To cancel this setting, you need to carry out the above
maintenance-mode procedure.

IV - 33

1.18 Fan

(1) Disconnect the fan harness from the engine PCB.
(2) Remove two screws, take out the heater wires from the latch of the fan duct, and take off the

fan duct together with the fan.

IV - 34

(3) As shown below, pull the fan duct outwards and take out the fan.

nn Reassembling Notes

• Put the fan back into place so that the rating label faces outwards and upside down.

• Route the heater wires through the latch of the fan duct as shown on the previous page.

IV - 35

1.19 Drive Gear ASSY and Main Motor ASSY

(1) Remove five screws from the drive gear ASSY.
(2) Tilt the drive gear ASSY towards you while taking care not to drop the develop joint and

spring, and then disconnect the main motor harness.
(3) Remove the front cover link and idle gear 56 from the main chassis.

IV - 36

*Provided on models supporting video capture

(4) Remove four screws and take off the main motor ASSY from the drive gear ASSY.

nn Reassembling Notes

• If you have removed the gear 39/98 from the drive gear ASSY, hook the spring as shown

below.

IV - 37

1.20 NCU Shield and NCU PCB

(1) Remove three screws from the NCU shield, then take off the NCU shield.

Taptite, cup S M3x6
(Tightening torque: 0.5 N•m)

(2) USA version: Disconnect the main-NCU harness from the main PCB.

European version: Disconnect the main-NCU harness and main-NCU harness 2 from the main

PCB. See the illustration given on the next page.
(3) Remove the screw from the NCU PCB and take out the PCB.

IV - 38

nn Reassembling Notes

[USA version]

• Route the main-NCU harness above the scanner motor harness as illustrated below.

[European version]

• As illustrated below, route the main-NCU harness and main-NCU harness 2 between the NCU

PCB and the power supply bracket to prevent them from interfering with the primary circuitry on
the NCU PCB. Then install the NCU shield.

IV - 39

1.21 Bottom Plate, Main PCB, and Bottom Insulation Film

(1) Disconnect the following harnesses and flat cable from the main PCB:

• Panel-main harness (6-pin, P3)

• Main-LV-engine harness (6-pin, P22)

• Laser flat cable (P9)

• Engine-main harness (12-pin, P8)

• VC harness*1 (2-pin, P11)

• CIS harness (7-pin, P12)

• In-casing temperature sensor harness (2-pin, P13)

• Scanner motor harness (4-pin, P14)

*1 Provided on models supporting video capture
*2 Provided on models equipped with a handset
*3 Provided on the European version

IV - 40

(2) Turn the main chassis upside down.
(3) Remove 14 screws (nine "a" and five "b").
(4) Slightly lift up the bottom plate and pull it to the rear until you can remove screw "c."
(5) Remove screw "c" to release the grounding wire.
(6) For models available with a 2nd paper cassette: Unhook the 2nd cassette relay PCB bracket

from the bottom plate.
(7) Pull the bottom plate to the rear and out of the main chassis.

IV - 41

"a": Taptite cup S M3x6
"b": Taptite, bind B M4x12
"c": Screw, pan (washer) M3.5x6

(8) Remove screw "d" and disconnect the paper ejection sensor PCB from the main PCB.
(9) Remove five screws (three "e" and two "f"), then take off the main PCB from the bottom plate.
(10) Remove the bottom insulation film.

nn Reassembling Notes

• When putting the bottom plate back into place, make sure that the grounding wire is looped and

routed through the support film (as illustrated on page IV-44) and then secure the grounding
wire to the bottom plate with screw "c" (shown on the previous page).

• When connecting the engine-main harness, laser flat cable, and main-LV-engine harness to the

main PCB, prevent them from interfering with each other in the vicinity of the connectors.

• After you replace the main PCB, be sure to follow the flowchart given on the next page.

"d" and "e": Taptite, cup S M3x6
"f": Machine screw, pan M3x6

IV - 42

Setting up the main PCB after replacement

IV - 43

* For the American version equipped with a handset.

1.22 Low-voltage Power Supply PCB and Power Inlet

(1) Remove two screws "g" and take off the rear underbar.
(2) Remove screw "h."
(3) Slightly lift up the low-voltage power supply PCB and disconnect the heater harness and

main-LV-engine harness. The low-voltage power supply PCB is connected to the power inlet

with soldered lead wires.
(4) Remove screw "i."
(5) While holding up the low-voltage power supply PCB, take out the power inlet from the main

chassis to the inside in the direction of the arrow shown below.
(6) To separate the power inlet from the low-voltage power supply PCB, unsolder the two lead

wires from the PCB.

IV - 44

"g" and "i": Taptite, cup S M3x6
"h": Taptite, cup S M3x6

(Tightening torque: 0.5 N•m)

nn Reassembling Notes

• When connecting the power inlet to the low-voltage power supply PCB, insert the brown and

blue lead wires into eyelets L and N in the PCB, respectively, and then solder those wires on
the solder side of the PCB.

• After setting the power inlet back into place, fold the grounding wire into two and route the fold

through cutout "Y" provided in the support film as shown on the previous page.

• When reinstalling the low-voltage power supply PCB, route the main-LV-engine harness

through cutout "X" provided in the support film as shown on the previous page.

IV - 45

1.23 Inner Insulation Film, High-voltage Power Supply PCB, Engine PCB, and 2nd Cassette Relay
PCB*

(*Provided on models available with a 2nd paper cassette)

(1) Remove screw "a" and take off the inner insulation film.
(2) Remove three screws (two "b" and one "c") from the high-voltage power supply PCB and

engine PCB.
(3) Slightly lift up the high-voltage power supply PCB and disconnect it from the engine PCB.
(4) Pull the spring up and out.
(5) Slightly hold up the engine PCB and disconnect the following harnesses:

• Toner sensor (light-receiver) harness (3-pin, P1)

• Main-LV-engine harness (2-pin, P15)

• 2nd cassette relay harness* (8-pin, P8)

• Heater thermistor harness (2-pin, P6), if the heat-fixing unit has not been removed

• Fan harness (2-pin, P7), if the fan has not been removed

• Toner sensor (LED) harness (4-pin, P10)

• Main motor harness (6-pin, P9)

• Polygon motor harness (5-pin, P12)

• Solenoid harness (2-pin, P13)

"a," "b," and "c": Taptite, bind B M4x12

IV - 46

(6) For models available with a 2nd paper cassette: Pull the 2nd cassette relay PCB bracket to

Early lot machines

Later lot machines

take out its harness. Remove the screw and take off the 2nd cassette relay PCB from its

bracket.

nn Reassembling Notes

• Before reinstalling the high-voltage power supply PCB, push in the spring with a flat

screwdriver until it snaps into place as shown below.

• Before reinstalling the high-voltage power supply PCB, check the high-voltage contacts for any

toner particles, paper dust or dirt, and clean them out.

IV - 47