Brother MFC-9160, MFC-9180, DCP-1000, MFC-6800 Service Manual
Multi-Function Machine
SERVICE MANUAL
MODEL: MFC6800/DCP1000
MFC9180/MFC9160
© Copyright Brother 2001
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.
PREFACE
This publication is a Service Manual covering the specifications, construction, theory of operation,
and maintenance of the Brother multi-function machine. It includes information required for field
troubleshooting and repair--disassembly, reassembly, and lubrication--so that service personnel
will be able to understand machine function, to rapidly repair the machine and order any necessary
spare parts.
To perform appropriate maintenance so that the machine 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 1 GENERAL DESCRIPTION
CHAPTER 2 INSTALLATION
CHAPTER 3 THEORY OF OPERATION
CHAPTER 4 DISASSEMBLY/REASSEMBLY AND LUBRICATION
CHAPTER 5 MAINTENANCE MODE
CHAPTER 6 ERROR INDICATION AND TROUBLESHOOTING
Appendix 1. EEPROM Customizing Codes
Appendix 2. Firmware Switches (WSW)
Appendix 3. 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: JUNE 2001 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
GENERAL DESCRIPTION
1
CHAPTER 1 GENERAL DESCRIPTION
CONTENTS
1.1 OUTLINE..........................................................................................................................1-1
1.1.1 External Appearance and Weight ........................................................................1-1
1.1.2 Components ......................................................................................................... 1-1
1.2 SPECIFICATIONS............................................................................................................1-2
1.1 OUTLINE
m
m
1.1.1 External Appearance and Weight
The figure below shows the machine appearance and approximate dimensions.
(H) 354 mm
13.9"
(D) 458 m
18.0"
Weight: Machine proper Approx. 11 kg
Machine (incl. drum unit & toner cartridge) Approx. 12 kg
In package Approx. 16 kg
1.1.2 Components
The machine consists of the following major components:
(W) 459 m
18.1"
1-1
1.2 SPECIFICATIONS
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Model Name MFC 6800 DCP 1000
GENERAL
ine Laser (YL4
Print En
Modem Speed (bps
Transmission S
ITU-T Grou
Codin
ut/Output Widt h 5.8"-8.5"/3.5"- 8.5" 5.8"-8.5"/3.5" -8.5"
In
In
ut/Output Length 5"-14"/5"-14" 5"-14"/5"-14"
DF (pages
LCD Size 16 characters x 2 lines 16 characters x 2 lines
LCD Backli
Backu
Memory Capacity (physical
Optional Memor
Dimensions w/ Carton
Dimensions w/o Carton
ht w/ Carton 16 k
Wei
Weight w/o Carton 11 k
Colo
Operatin
Humidit
Power Source 120 VAC 50/60Hz 120 VAC 50/60Hz
Power Consum
On/Off Switch Yes Yes
Warm U
TELEPHONE
Handset No One-Touch Dial No -
eed Dial 100 -
S
eaker Phone No -
S
Chain Dialin
Caller ID Yes Call Waitin
Distinctive Rin
Call Mana
Hold/Mute Ke
Power Failure Dialin
eaker (Volume
S
Rin
Volume
Handset Volume - PBX Feature No Transfer Method No -
FA
Internet FA
Eas
Receive/Fax Detect Yes Fax/Tel Switch - Enhanced Remote Activate Yes Scan S
Memor
Memor
Broadcastin
Manual Broadcasting
Out-of-Pa
Out-of-Pa
uto Reduction Yes ECM
Grou
Memor
Memor
Color FAX
Color FAX
LIST/REPORT
ctivity Report/Journal Report Yes (up to 200
Transmission Verification Re
INTERFACE
External TAD Interface Yes No
Host Interface
Host Interface
Host Interface
LAN Interface No No
cceptable Media Card Slot
nalog Video Port
eed (sec.
Method MH/MR/ MM
Clock Yes (1 hour
WxDxH
WxDxH
Environment Temperature 10 - 32.5 degrees Centigrade 10 - 32.5 degrees Centigrade
tion (Sleep/Standby/Peak
Time
Caller I D No -
eNo-
eed (sec./page, A4:Standard
Transmission (Brother#1 Chart
Transmission (ITU-T Chart
er Reception (Brother #1 Chart
er Reception (ITU-T Chart
Error Correction Mode
Dial Yes (up to 6
Securit
Backu
Document Send/Receive
Memory Send/Recei ve
ort Yes -
Serial
IEEE1284
USB
500 pages (MMR/Standard Resolution
400 pages (MMR/Standard Resolution
500 pages (MMR/Standard Resolution
400 pages (MMR/Standard Resolution
YL4-FB(MFC) YL4-DCP
14,400 (Fax
6 (Brother#1,MMR
G3 -
Up to 30 Up to 30
No No
8 Mbytes (RAM
No No
596 x 566 x 452 mm 596 x 566 x 452 mm
459 x 458 x 354 mm 459 x 458 x 354 mm
Gray 1495 Gray 1495
20 - 80% 20 - 80%
15W/ 75W/ 940W or less 15W/ 75W/ 940W or less
rox. 13 sec.
Yes -
Yes -
No -
No Yes (3 steps + OFF
Yes (3 steps + OFF
N/
rox. 3 -
Yes (150 locations
Yes -
Yes -
No -
No No
No -
No -
No No
Yes Yes
Yes Yes
N/
N/
Laser (YL4
-
-
-
Yes (1 hour
8 Mbytes (RAM
16 k
11 k
rox. 13 sec.
-
-
-
-
-
-
-
-
-
-
(1/2)
1-2
Model Name MFC 6800 DCP 1000
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PRINTER
Color/Mono Mono Mono
En
ine Type Laser (YL4
Resoluti on (dpi
S
eed
Pa
er Capacity (sheets
dditional Paper Capacity (sheets
Out
ut Paper Capacity (sheets
Standard Print Lan
Emulation No No
Resident Fonts No No
Fonts Disk Based Yes Yes
er Handling Size LTR, LGL, A4, B5, A5, EXE LTR, LGL, A4, B5, A5, EXE
Pa
Manual Feed Slot N/
Other Paper TypeOHP, Envelo
Sheet Weight (Paper Tray)
Printer Drive
COPY
Color/Mono Mono Mono
S
eed (cpm
Mult i Co
Mult i Co
Reduction/Enlargement (%
Resoluti on
First Co
SCANNER
Color/Mono Colo
Resoluti on(Optical : dpi
Resoluti on(Int. : dpi
Gra
Color Depth
TWAIN Compliant&Operating System Win95/98/98SE/Me, WinNT4.0WS
PCI Scanner (Parallel/Serial)
BUNDLED SOFTWARE
For Windows
Su
Printer Drive
TWAIN Yes Yes
Viewe
PC Fa
Remote Setu
PC Diagnostics Yes
Others
For iMac/G3/G4
Su
TWAIN MacOS 8.6-9.1 MacOS 8.6-9.1
Printer Drive
TWAIN Yes Yes
Viewe
PC Fa
Remote Setu
PC Diagnostics
Others - -
ACCESSORY
Life / Yield Starter: 2,200
Toner : TN-250 Re
Drum : DR-250 20,000 pa
Stack
Sort
Out Time (From Ready Mode/ADF
Scale 256 256
ort OS version
ort OS version Printer Drive
e Windows GDI Windows GDI
Manual Slot
Win95/98/98SE/Me/2000Professional
From Ready Mode/FB
Win95/9 8/98SE/Me, WinNT4.0WS/2000Professional Win95/98/98SE/Me, W inNT4.0W S/2000Professi onal
Pop Up Menu Yes Yes
OC
uto E-mail Printing(Win 95/98(SE)/Me onl
Pop Up Menu
OC
YL4-FB(MFC) YL4-DCP
600 x 600 600 x 600
up to 10 up to 10
200 200
No No
50 50
es, Organize
2
/m
64-158
NT4.0WS MacOS 8.5.1-9.1 NT4.0WS MacOS 8.5.1-9.1
25 -- 400 in 1% increments 25 -- 400 in 1% increments
600x300 (Max. 600x2,400
2000Profess ional, MacOS 8.6-9.1 2000Professional, MacOS 8.6-9.1
Yes(TX:FAX Share onl
ular:2,200 pages @5% coverageRe
8,000 pages @5% cvrg: 1 page/job 8,000 pages @5% cvrg: 1 page/job
16 - 42 lb
N/
Up to 10 Up to 10
Yes Yes
Yes (ADF onl
300 x 300 300 x 300
rox. 13 sec.
rox. 12 sec.
9,600x9,600 9,600x9,600
24 bit
8 bits x 3
Parallel/USB Parallel/USB
Yes Yes
Yes Yes
Yes Yes
Yes No
MacOS 8.5.1-9.1 MacOS 8.5.1-9.1
Yes Yes
Yes Yes
No No
Yes Yes
Yes No
No No
No No
es @5% coverage Stater: 2,200 pages @5% coverage
es @5% cvrg: 20 pages/job 20,000 pages @5% cvrg: 20 pages/job
Win95/98/98SE/Me/2000Professional
Win95/98/98SE/Me, WinNT4.0WS/
uto E-mail Printing(Win 95/98(SE)/Me onl
Laser (YL4
OHP, Envelopes, Organize
64-158 g/m2 (16 - 42 lb)
Yes (ADF onl
rox. 13 sec.
rox. 12 sec.
600x300 (Max. 600x2,400
ular:2,200 pages @5% coverage
Colo
24 bit (8 bits x 3
N/
No
(2/2)
1-3
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Model Name
GENERAL
ine Laser (YL4
Print En
Modem Speed(bps
Transmissi on S
ITU-T Grou
Codin
ut/Output Widt h 5.8"-8.5"/3.5"-8.5" 5.8"-8.5"/3.5"-8.5"
In
In
ut/Output Length 5"-14"/5"-14" 5"-14"/5"-14"
ADF(pages)
LCD size 16 characters x 2 lines 16 characters x 2 lines
LCD Backli
Backu
Memory Capacity (physical
Optional Memor
Dimensions w/ Carton (WxDxH
Dimensions w/o Carton
Wei
ht w/ Carton 16 k
Weight w/o Carton 11 k
Colo
erating Environment Temperature 10 - 32.5 degrees Centigrade 10 - 32.5 degrees Centigrade
O
Humidit
Power Source 22 0-240 VAC 50/60 Hz 220-240 VAC 50/60Hz
Power Consum
On/Of f Swi tch Yes Yes
Warm U
TELEPHONE N/A
Handset No One-Touch Dial No S
eed Dial 100 -
S
eaker Phone No Chain Dialin
Caller ID N/
Call Waitin
Distinctive Rin
Call Mana
Hold/Mute ke
Power Failure Dialin
S
eaker Volume Yes (3 steps + OFF
Rin
Volume Yes (3 steps + OFF
Handset Volume N/
PBX Feature Yes Transfer Method Flash -
FA
Internet FA
Eas
Receive/Fax Detect Yes Fax/Tel Switch Yes Enhanced Remote Activate Yes Quick Scan
Memor
Memor
Broadcastin
Manual Broadcastin
Out-of-Pa
Out-of-Pa
uto Reduction Yes -
Error Correcti on Mode
ECM
Grou
Memor
Memor
Color FAX
Color FAX
LIST/REPORT
ctivity Report/Journal Report Yes (up to 200
Transmissi on Verifi cation Re
INTERFACE
External TAD Interface Yes No
Host Interface
Host Interface
Host Interface
LAN Interface No No
cceptable Media Card Slot
nalog Video Port
eed(sec.
Method MH/ MR/MM
ht Yes Yes
Clock Yes (9 hours
WxDxH
tion (Sleep/Standby/Peak
Time
Caller ID N/
Yes
eNo-
Memory transmission
Transmission (ITU-T #1 Chart) 400
Transmission (Brother#1 Chart
er Reception (ITU-T #1 Chart) 400
er Reception (Brother#1 Chart
Dial Yes (up to 6
Securit
Backu
Document Send/Receive
Memory Send/Receive
ort Yes -
Serial
IEEE1284
USB
Yes as defaul t. Approx.2.8 sec/page (A4 standar d
YL4-FB(w/ Modem) YL4-FB(w/o Modem)
MFC-9180 MFC-9160
14,400 (Fax
rox. 6 (brother #1chart,MMR
15W/ 75W/ 940W or less 15W/ 75W / 940W or less
500 pages (MMR/Standard Resolution
500 pages (MMR/Standard Resolution
G3 -
U
to 30 (75 g/m
8 Mbytes (RAM
596 x 566 x 452 mm 596 x 566 x 452 mm
459 x 458 x 354 mm 459 x 458 x 354 mm
Gray 1495 Gray 1495
20 - 80 % 20 - 80 %
rox. 12 sec.
UK.DEN onl
es (MMR/Standard Resolution) -
Yes ( 150 locations) -
Yes (50 locations ) -
es (MMR/Standard Resolution
Yes ( Max. 4 days
No / No No / No -
2
N/
Yes -
N/
N/
N/
Yes -
Yes -
No No
Yes Yes
Yes Yes
N/
N/
Laser (YL4
-
-
-
to 30 (75 g/m
Yes (1 hour
8 Mbytes (RAM
16 k
11 k
rox. 12 sec.
-
-
-
-
-
-
-
-
N/A
-
-
-
-
-
-
-
-
2
(1/2)
1-4
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Model Name
PRINTER
YL4-FB(w/ Modem) YL4-FB(w/o Modem)
MFC-9180 MFC-9160
Color/Mo no Mono Mono
En
ine Type Laser (YL4
Resolution (dpi
S
eed
Paper Capacity (sheets)
dditional Paper Capacity (sheets
Out
ut Paper Capacity (sheets
Standard Print Lan
Emulation Yes
Resident Fonts
e Windows GDI Windows GDI
Yes ( Bitmap font: LetterGothic16.66, OCR-A,
OCR-B, Scalable font: 49 fonts
600 x 600 600 x 600
200
up to 10 up to 10
2
75 g/m
No No
50 50
PCL5e
Yes ( Bitmap font: LetterGothic16.66, OCR-A,
Laser (YL4
200 (75 g/m
2
Yes (PCL5e
OCR-B, Scalable font: 49 fonts )
Fonts Disk Based Yes Yes
er Handling Size LTR, LGL, A4, A5, EXE, A6, ISO B5, ISO B6 LTR, LGL, A4, A5, EXE, A6, ISO B5, ISO B6
Pa
Manual Feed Slot N/
Other Paper TypeOHP, Envelo
Sheet Weight (Paper Tray)
Manual Slot
Printer Drive
Win95/98(SE)/Me/NT4.0WS/2000 professional Win95/98(SE)/Me/NT4.0WS/2000 professional
64-158
es, Organize
2
/m
16 - 42 lb) 64-158
OHP, Envelopes, Organize
/m2 (16 - 42 lb)
N/
COPY
Color/Mo no Mono Mono
eed (cpm
S
Multi Co
Multi Co
Reduction/Enlar
Stack
Sort
ement (%
Resolution
Out Time (From Ready Mode/ADF
First Co
From Ready Mode/FB
Up to 10 Up to 10
Yes Yes
Yes (on ADF only ) Yes
25 to 400 in 1% increments 25 to 400 in 1% increments
on ADF only )
300 x 300 (print) 300 x 300 (print)
rox. 13 sec.
rox. 12 sec.
rox. 13 sec.
rox. 12 sec.
SCANNER
Color/Mono Color/Mono Color/Mono
Resolution
Resolution
Gra
Color Depth
TWAIN Compliant&Operating System Win95/98(SE)/Me/NT4.0WS/ 2000Professional Win95/ 98(SE)/Me/NT4.0WS/2000Professional
PCI Scanner (Parallel/Serial)
BUNDLED SOFTWARE
For Windows
Su
Printer Drive
TWAIN Yes Yes
Viewe
Po
OC
PC Fa
Remote Setu
PC Diagnostics
tical: dpi
Int.: dpi
Scale 256 256
600 x 2,400 600 x 2,400
9,600 x 9,600 9,600 x 9,600
24 bits
8 bits x 3
24 bits (8 bits x 3
MacOS 8.6-9.1 MacOS 8.6-9.1
Parallel/USB Parallel/USB
For Windows
ort OS version
Win95/9 8/98SE/Me, WinNT4. 0WS/2000Profrs sional Wi n95/98/ 98SE/Me, WinNT4.0W S/2000Profrssional
Yes Yes
Yes Yes
Menu Yes Yes
Yes Yes
Yes No
Yes No
Yes Yes
Others No No
For iMac/G3/G4
ort OS version Print MacOS8.5.1-9.1 MacOS8.5.1-9.1
Su
Others MacOS8.6-9.1 MacOS8.6-9.1
Printer Drive
TWAIN Yes Yes
Viewe
Po
Menu No No
OC
PC Fa
Remote Setu
PC Diagnostics
Yes Yes
No No
No No
Yes No
No No
No No
Others No No
ACCESSORY
Life / Yield Starter: N/
Toner:TN-8000 Regular:2,200 pages @5% coverageRe
Starter: N/
ular:2,200 pages @5% coverage
Drum:DR-8000 20,000 pages @5% cvrg: Continuous printi ng 20,000 pages @5% cvrg: Continuous printing
es @5% cvrg: 1 page/job 8,000 pages @5% cvrg: 1 page/job
8,000
(2/2)
1-5
CHAPTER
INSTALLATION
2
CHAPTER 2 INSTALLATION
CONTENTS
2.1 INSTALLING THE UPDATE DATA TO THE FACSIMILE MACHINE.............................2-1
2.2 SETTING ID CODES TO FACSIMILE MACHINES.........................................................2-3
2.1 INSTALLING THE UPDATE DATA TO THE
r
FACSIMILE MACHINE
If the program version is updated or the main PCB is replaced, then 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 machine to your computer
(1) Make sure that your computer is turned off.
(2) Make sure that the machine's power cord is unplugged from a wall socket. (If the machine has
a power ON/OFF switch, make sure that the switch is turned off.)
(3) Connect the parallel interface cable to the parallel port on the back of the machine 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) While pressing the 5 key on the machine's control panel, plug the machine's power cord into a
wall socket (or turn on the power ON/OFF switch if the machine has the switch).
(6) Check to see that the following pattern displays on the LCD. If it does not display, go back to
step (2) above.
← 1st row: Blank-and-black patterns
← 2nd row: Blank
(7) Turn on your computer.
Parallel interface
cable
Host compute
Lock wires
2-1
Installing the update data onto the flash ROM of the facsimile machine
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 machine correctly.
(5) To start the transfer utility transmitting the update data to the flash ROM of the facsimile
machine, type the following:
ICEN filename /b
Then press the ENTER key.
During downloading, the machine beeps intermittently.
Upon completion of the downloading, the machine beeps continuously.
NOTE: If the facsimile machine cannot return to the standby state after completion of downloading,
turn the power off and on.
2-2
2.2 SETTING ID CODES TO FACSIMILE MACHINES
Function
Brother facsimile machines are assigned unique ID codes (character strings) at the factory. If you
replace the main PCB of the machine, the machine will lose its assigned ID code so that it will not
be identified by the connected PC*.
You need to assign a unique ID code (character string) to the machine according to the procedure
given here. For models covered by this manual, set serial numbers given to individual machines as
ID codes.
(*ID codes are essential when more than one machine is connected to a single PC via USB.)
Connecting each of facsimile machines to your PC
(1) Make sure that your PC is turned off.
(2) Make sure that the machine's power cord is unplugged from a wall socket or other power
source.
(3) Connect the interface cable to the parallel interface port on the back of the facsimile machine
and secure it with the lock wires.
(4) Connect the other end of the interface cable to the printer port of your PC and secure it with
the two screws.
(5) Plug the machine's power cord into a wall socket or other power source.
(6) Turn on your PC.
Operating Procedure
(1) On your PC, run the ID setting utility. Follow the instructions shown on the PC's screen and
enter the 9-digit serial number (e.g., G01012345) printed on the nameplate labeled to the back
of the facsimile machine as an ID code. Then press the Enter key.
The ID setting utility will transmit the ID code data from your PC to the facsimile machine
and then it will terminate.
The facsimile machine will automatically return to the standby mode.
(2) To check whether the entered character string (ID code) is correct, make the machine enter the
maintenance mode (refer to CHAPTER 5, Section 5.1) and then press the 1 key twice
(Subsection 5.3.5).
The facsimile machine will print out a Configuration List. At the right top of the list, "SER.#:
BROXXXXXXXXX" is printed.
(3) Check that the character string entered in step (2) is printed in "XXXXXXXXX."
If it is OK, press the 9 key twice to exit from the maintenance mode.
If something other than that is printed in XXXXXXXXX, check the connection between the
PC and facsimile machine and go back to step (1).
2-3
CHAPTER
THEORY OF OPERATION
3
CHAPTER 3 THEORY OF OPERATION
CONTENTS
3.1 OVERVIEW ......................................................................................................................3-1
3.2 MECHANISMS .................................................................................................................3-2
3.2.1 Scanner Mechanism ............................................................................................ 3-4
3.2.2 Laser Printing Mechanism.................................................................................... 3-6
3.2.2.1 Paper pulling-in, registration, feeding, and ejecting mechanism..................3-6
3.2.2.2 Print process mechanism............................................................................. 3-8
3.2.2.3 Heat-fixing mechanism ................................................................................3-9
3.2.3 Sensors and Actuators .......................................................................................3-10
3.3 CONTROL ELECTRONICS ...........................................................................................3-12
3.3.1 Configuration ......................................................................................................3-12
3.1 OVERVIEW
3-1
* Provided on models supporting facsimile function.
3.2 MECHANISMS
The facsimile machine is classified into the following mechanisms:
n SCANNER MECHANISM - ADF mechanism
n LASER PRINTING MECHANISM - Paper pulling-in and registration mechanism
n SENSORS AND ACTUATORS
- Document scanning mechanism
- Print process mechanism (consisting of charging,
exposing, developing, transferring, and erasing
processes) with paper feeding mechanism
- Heat-fixing mechanism with paper feeding
mechanism
- Paper ejecting mechanism
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3-3
3.2.1 Scanner Mechanism
This mechanism consists of the document guide base, ADF & document tray ASSY and scanner
unit.
The ADF (automatic document feeder) unit contains a separation roller ASSY, document feed
roller ASSY, document ejection roller, ADF motor, and document front and rear sensors.
The scanner unit consists of a scanner top cover, CCD unit, CCD drive mechanism, CCD HP
sensor, and scanner base.
For details about the sensors, refer to Subsection 3.2.3.
3-4
This scanner mechanism supports a dual scanning system.
(1) If you set documents on the document guide base with their faces up and start the scanning
operation, then the ADF motor rotates to pull in those documents into the ADF unit, starting
from the top sheet to the bottom, page by page. Each document curves downwards and turns to
the right with the document feed roller so as to advance above the CCD unit, and then it is fed
out to the document tray with the document ejection roller ASSY.
This way, documents move above the CCD unit being kept in a stationary position.
(2) If you open the ADF & document tray ASSY, put a sheet of document (or put a bound book
opened) on the glass of the scanner top cover, close the ADF & document tray ASSY, and
start the scanning operation, then the CCD drive mechanism will be driven.
The CCD motor built in the CCD unit rotates. As illustrated below, the CCD drive gear and
idle pulley carry the CCD drive belt on the underside of the CCD unit, so clockwise and
counterclockwise rotations of the CCD motor move the CCD unit to the right and left,
respectively.
In this scanning system, the CCD unit moves horizontally beneath a document being kept in
stationary position.
The CCD unit contains a charge coupled device (CCD) image sensor. The cold-cathode
fluorescent lamp 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.
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3.2.2 Laser Printing Mechanism
3.2.2.1 Paper pulling-in, registration, feeding, and ejecting mechanism
3-6
Paper pulling-in and registration mechanism
The paper pulling-in and registration mechanism consists of the pull-in roller gear (incorporated in
the auto sheet feeder ASF), planetary gear system, paper feed solenoid, solenoid lever, clutch
release lever, and registration sensor. (For the details about the sensor, refer to Subsection 3.2.3.)
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 ASF rotates to pull in paper into the machine, 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 drive gear so as to release the clutch gear, the clutch gear rotates and
the pull-in roller drive gear does not rotate. This way, the clutch gear switches the transmission of
the motor rotation to the pull-in roller drive gear on and off.
The solenoid on/off timing and the clutch release lever timing allow this mechanism to pull in a
sheet and register it against the registration roller.
Paper feeding and ejecting mechanism
If the main motor rotates clockwise, the rotation is transmitted via the gear train to the drum drive
gear, heater roller drive gear, and paper ejection roller drive gear.
After the paper passes through the heat-fixing process, it will be ejected onto the paper tray.
If the leading edge of the paper pushes up the actuator of the paper ejection sensor, the
photosensor becomes opened, signaling the start of paper ejection. If the trailing edge has passed
through the sensor actuator, the sensor becomes closed, signaling the completion of paper ejection.
Then, the main motor stops rotation.
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3.2.2.2 Print process mechanism
The print process unit works with laser beam, electrical charges, and toner. The graph below
shows the transition of electrical charge on the surface of the laser-sensitive drum through the five
processes: charging, exposing, developing, transferring, and erasing processes.
A single cycle of laser-sensitive
drum operation
Electrical
charge
on the drum
surface (V)
1
+1000
+700
+400
+300
(a)
(b)
2
3
4
1
Charges the drum surface positively.
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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3.2.2.3 Heat-fixing mechanism
As the paper passes between the heater roller and the pressure roller in the heat-fixing unit, the
heater roller fuses the toner on the paper.
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3.2.3 Sensors and Actuators
This machine has ten sensors: seven photosensors, two thermistors and a mechanical switch as
described below.
Sensor name Type Located on
Document front sensor Photosensor
Document rear sensor Photosensor
Document sensor PCB in the
ADF
Document tray open sensor Mechanical switch Document tray
Scanner open sensor Photosensor Control panel PCB
Registration sensor Photosensor Main-fan PCB
Paper ejection sensor Photosensor High-voltage power supply PCB
CCD HP sensor Photosensor CCD PCB on the CCD unit
Toner sensor Photosensor
Toner sensor PCB
Toner thermistor Thermistor
Heater thermistor Thermistor Heat-fixing unit
• 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.
• Document tray open sensor which detects whether the document tray is closed.
• Scanner open sensor which detects whether the scanner unit 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.
• Paper ejection sensor which detects whether the recording paper goes out of the machine.
• CCD HP sensor which detects whether the CCD unit is placed in the home position.
• Toner sensor which detects whether there is toner or a toner cartridge is loaded.
• Toner thermistor which allows the controller to monitor the ambient temperature of the toner
cartridge.
• Heater thermistor which allows the controller to monitor the temperature of the heater roller of
the fixing unit.
These 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.
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Location of Sensors and Actuators
3-11
3.3 CONTROL ELECTRONICS
3.3.1 Configuration
The hardware configuration of the facsimile machine is shown below.
Configuration of Facsimile Machine
(NOTE 1) Provided on models equipped with facsimile function.
(NOTE 2) Provided on the European, Pacific, and Asian versions.
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