Brother MFC-4820C User manual

FACSIMILE EQUIPMENT
SERVICE MANUAL
MODEL: MFC4820C/MFC4420C

© Copyright Brother 2003
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.

i
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 eight chapters and appendices.
SAFETY INSTRUCTIONS
CHAPTER 1 PARTS NAMES & FUNCTIONS
CHAPTER 2 SPECIFICATIONS
CHAPTER 3 SETTING UP OF THE MACHINE
CHAPTER 4 THEORY OF OPERATION
CHAPTER 5 ROUTINE MAINTENANCE
CHAPTER 6 DISASSEMBLY/REASSEMBLY
CHAPTER 7 MAINTENANCE MODE
CHAPTER 8 TROUBLESHOOTING
Appendix 1. Serial No. Descriptions
Appendix 2. Software Installation
Appendix 3. EEPROM Customizing Codes
Appendix 4. Firmware Switches (WSW)
Appendix 5. Re-packing Instructions
Appendix 6. Wiring Diagram
Appendix 7. 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.

ii
SAFETY PRECAUTIONS
To Use the Machine Safely
Save these instructions for later reference.
There are high voltage electrodes inside the
machine. Before you clean the machine or
clear a paper jam, make sure you have
unplugged the power cord from the power
outlet.
Do not handle the plug with wet hands.
Doing this might cause an electrical shock.
To prevent injuries, be careful not to put
your hands on the edge of the machine
under the scanner cover.
To prevent injuries, be careful not to put
your fingers in the area shown in the
illustration.
Use caution when installing or modifying telephone lines. Never touch telephone wires or terminals that
are not insulated unless the telephone line has been disconnected at the wall jack. Never install telephone
wiring during a lightning storm. Never install a telephone jack in a wet location unless the jack is
specifically designed for a wet location.
Install equipment with a power cord near a socket-outlet that is easily accessible.
To reduce the risk of shock or fire, use only a No. 26 AWG or larger telecommunication line cord.
Do not use a telephone in the vicinity of gas leak to report leak.

iii
Lightning and power surges can damage this product! We recommend that you use a quality surge
protection device on the AC power line and on the telephone line, or unplug the lines during a lightning
storm.
Do not use this product near appliances that use water, in a wet basement or near a swimming pool.
Avoid using a telephone other than a cordless type during an electrical storm. There may be a remote risk
of electric shock from lightning.
Choosing a Location
Place your machine on a flat, stable surface that is free of vibration and shocks, such as a desk. Put the
machine near a telephone jack and a standard, grounded power outlet. Choose a location where the
temperature remains between 50°F and 95°F (10° and 35°C).
Avoid placing your machine in a high-traffic area.
Do not place near heaters, air conditioners, water, chemicals, or refrigerators.
Do not expose the machine to direct sunlight, excessive heat, moisture, or dust.
Do not connect your machine to electrical outlets controlled by wall switches or automatic timers.
Disruption of power can wipe out information in the machine’s memory.
Do not connect your machine to electrical outlets on the same circuit as large appliances or other
Equipment that might disrupt the power supply.
Avoid interference sources, such as speakers or the base units of cordless phones.

CHAPTER 1
PARTS NAMES & FUNCTIONS

CHAPTER 1 PARTS NAMES & FUNCTIONS
CONTENTS
1.1 EQUIPMENT OUTLINE ...................................................................................................1-1
1.2 CONTROL PANEL...........................................................................................................1-3
1.3 COMPONENTS................................................................................................................1-5

1-1
1.1 EQUIPMENT OUTLINE
Front view
(6) Paper support
(5) Paper tray
(4) Paper guide
(3) PhotoCapture™ media slot
(2) Output paper support
(1) Output paper support extension
(10) Control panel
(9) Scanner cover release lever
(8) Scanner cover
(7) Document cover
Rear view
(13) USB interface connector
(12) Telephone line jack
(11) External telephone line jack

1-2
No. Name Description
(1) Output paper support extension Pull it out to prevent the printed paper from falling.
(2) Output paper support
Printed paper comes out here.
(3) PhotoCapture™ media slot Insert your media card into the appropriate slot to print a digital
photo.
(4) Paper guide Press and slide it to fit the paper width.
(5) Paper tray Load paper here.
(6) Paper support Unfold to support paper.
(7) Document cover Open to place the original on the scanner glass.
(8) Scanner cover Open to install an ink cartridge or to remove jammed paper.
(9) Scanner cover release lever Pull to open the scanner cover.
(10) Control panel Use the keys and display to control the machine.
(11) External telephone line jack Plug in the modular plug on the external telephone line here.
(12) Telephone line jack Plug in the modular plug on the telephone line here.
(13) USB interface connector Connect the USB cable here.

1-3
1.2 CONTROL PANEL
A. Telephone and Message Center keys B. Liquid Crystal Display (LCD)
On/Off
Let’s you activate the Message Center and blinks if
you did not play your voice messages.
Play/Record
Lets you listen to voice messages stored in memory.
Also, it lets you record telephone calls.
Erase
Lets you delete voice messages, all fax messages or
all messages.
Speaker Phone
Lets you dial telephone and fax numbers and speak to
another party without lifting the handset.
Hold
Lets you place calls on hold.
Redial/Pause
Redials the last number you called. It also inserts a
pause in auto dial numbers.
Displays messages on the screen to help you set up
and use your machine.
Quality
Date Current receive
mode
Recording paper
type
A
BEDC

1-4
C. Navigation keys D. Dial Pad
Use these keys to dial telephone and fax numbers and
as a keyboard for entering information into the
machine.
The #key lets you temporarily switch the dialing
mode during a telephone call from Pulse to Tone.
E. Scan, Fax and Copy keys
Copy Options
Copy Options
You can quickly and easily select temporary settings
for copying.
Photo Capture
Let's you access PhotoCapture™ Center mode by
inserting your media card. After inserting your digital
camera's card, press the Copy Options to print the
thumbnails or digital photos or to temporarily change
the settings for digital direct printing.
Fax Resolution
You can temporarily change the resolution when you
send a fax.
Search/Speed dial
Lets you look up numbers that are stored in the
dialing memory. It also lets you dial stored numbers
by pressing # and a two-digit number.
Volume
When using the speaker or listening to the ring, you
can press this key to adjust the volume.
Menu/Set
Lets you access the Menu to program and store your
settings in the machine.
Press to scroll forward or backward to a menu
selection.
Press to scroll through the menus and options.
Stop/Exit
Stops a fax, cancels an operation or exits from the
menu.
Scan key:
Scan to
Lets you scan the next original and select the
destination in your computer (such as a word
processing, graphics or E-mail application, a Media
card or a folder on your computer.)
Copy keys:
Black Copy
Makes a black-and-white copy.
Color Copy
Makes a full-color copy.
Fax Start
Starts an operation, such as sending a fax.

1-5
1.3 COMPONENTS
Document cover
Upper cover
Engine unit
Handset mount*
ASF
Main PCB
Bottom plate
NCU PCB
Purge unit
Power supply PCB
Driver PCB
Modular PCB*
Media module
Rear cover L
USB PCB
Ink cartridge
support base
Ink cartridge PCB
Ink absorber box
Enclosure cover
Lower cover
Scanner unit
Control panel ASSY
* Provided on the MFC4820C.

CHAPTER 2
SPECIFICATIONS

CHAPTER 2 SPECIFICATIONS
CONTENTS
2.1 GENERAL ........................................................................................................................2-1
2.1.1 General Specifications .........................................................................................2-1
2.1.2 Paper Specifications.............................................................................................2-1
2.1.3 Printable Area.......................................................................................................2-4
2.1.4 Environmental Conditions .................................................................................... 2-5
2.2 OTHERS...........................................................................................................................2-6

2-1
2.1 GENERAL
2.1.1 General Specifications
Memory Capacity 16MB
Auto Sheet Feeder (ASF) Up to 100 sheets (20 lb.)
Printer Type Ink Jet
Print Method Piezo with 75 x 4 nozzles
Liquid Crystal Display (LCD) 16 characters x 2 lines, backlight
Operating Environment 50 to 95ºF (10 to 35ºC)
Best Print Quality 68 to 91ºF (20 to 33ºC)
Power Source 120 VAC, 50/60 Hz (U.S.A. and Canadian version only)
Power Consumption Standby: under 9.7 watts
Operating: under 50 watts
Dimensions 18.2 x 18.5 x 10.1 (inches)
462 x 469.7 x 255.5 (mm)
Weight 18.3 lb./8.3 kg (with components)
2.1.2 Paper Specifications
Recommended paper
Plain Paper: Xerox 4200
Inkjet Paper: KODAK® Premium Inkjet Paper (Matte)
Glossy Paper: JETPRINT PHOTO®
Professional Photo Paper
Transparencies: 3M Transparency Film (CG3410)

2-2
Paper Capacity of the Paper Tray
Paper Type Paper Size Number of Sheets
Letter, Executive, A4, A5 100 of 20 lb. (80 g/m2)
Up to 0.39 in. (10 mm)
Plain Paper (Cut Sheet)
Legal 50 of 20 lb. (80 g/m2)
Inkjet Paper Letter 20
Glossy Paper Letter 20
Transparencies Letter 10
Envelopes DL, COM 10, C5, Monarch 10
Postcard 4" x 6" 30
Index Card 5" x 8" 30
Paper Specifications for the Paper Tray
Cut Sheet Paper Weight Plain paper / Inkjet paper: 17 to 32 lb. (64 to 120 g/m2)
Glossy paper: Up to 40 lb. (150 g/m2)
Post card: Up to 45 lb. (170 g/m2)
Index card: Up to 32 lb. (120 g/m2)
Thickness Plain paper/Inkjet paper: 0.003 to 0.006 in. (0.08 to 0.15 mm)
Glossy paper: Up to 0.007 in. (0.18 mm)
Envelopes: Up to 0.02 in. (0.52 mm)
Post card: Up to 0.009 in. (0.23 mm)
Index card: Up to 0.006 in. (0.15 mm)

2-3
Paper Capacity of the Output Paper Support
Output Paper Support Up to 30 sheets of 20 lb. (80 g/m2)
(Transparencies and glossy paper must be picked up from the
output paper support one page at a time to avoid smudging.)
Do not use paper or envelopes:
that are damaged, curled, wrinkled, or irregularly shaped
0.08 in.
or longer
0.08 in.
or longer
0.08 in.
or longer
that are extremely shiny or highly textured
that were previously printed by a laser printer
that cannot be arranged uniformly when stacked
that are made with a short grain
Do not use envelopes:
that are of a baggy construction
that are embossed (have raised writing on them)
that have clasps on them
that are not sharply creased
that are preprinted on the inside

2-4
2.1.3 Printable Area
The printable area depends on the settings in the application you are using. The figures below show the
unprintable areas on cut sheet paper and envelopes.
(1) (1)
(2) (2)
(3) (4) (3) (4)
Cut Sheet Paper Envelopes
unprintable area
Paper Paper Size (1) Top (2) Bottom (3) Left (4) Right
Fax 0.12 0.12 0.12 0.12
Printer 0.12
(0.02)*
0.12
(0.02)*
0.12
(0.02)*
0.12
(0.02)*
Letter, A4
Copy 0.12 0.12 0.12 0.12
Executive, Legal Printer 0.12 0.12 0.12 0.12
Copy 0.12 0.12 0.12 0.12
Cut sheet
A5 Printer 0.12 0.12 0.12 0.12
Post card 4" x 6" Printer 0.12 0.47
(0.12)* 0.12 0.12
Index card 5" x 8" Printer 0.12
(0.02)*
0.12
(0.02)*
0.12
(0.02)*
0.12
(0.02)*
Envelopes DL, COM 10, C5, Monarch Printer 0.67 0.67 0.12 0.12
* When you set the Near-Edge printing feature to ON.
Printer depends on the Printer driver.
The figures above are approximate and the printable area may vary depending on the type of cut sheet paper
you are using.

2-5
2.1.4 Environmental Conditions

2-6
2.2 OTHERS
(1/6)
Model Name MFC-4420C MFC-4820C
GENERAL
Print Engine 2 head BH: 75 nozzles/color 2 head BH: 75 nozzles/color
Technology Inkjet Inkjet
Scanning Method CIS CIS
CPU Speed RISC-100MHz RISC-100MHz
Back up Clock Yes (1 hour) Yes (1 hour)
Operating Environment Temperature 10 - 35 (20-33) degrees Centigrade 10 - 35 (20-33) degrees Centigrade
Humidity 20 - 80 % (without condensation) 20 - 80 % (without condensation)
On/Off Switch Yes N/A
Demo Model Yes N/A
Simultaneous Operation*6 Yes Yes
Demo Print Yes N/A
Test Sheet Yes (in Menu Table) Yes (in Menu Table)
Min. Input of ADF (Width/Height) --
Max. Input of ADF (Width/Height) --
Max. Input of Glass (Width/Height) 8.5"/11.7", 216/297mm 8.5"/11.7", 216/297mm
Min. Output of Auto Cut sheet Feeder 3.5"/5.0", 89/127mm 3.5"/5.0", 89/127mm
Max. Output of Auto Cut sheet Feeder 8.5"/14.0", 216/356mm 8.5"/14.0", 216/356mm
Min. Output of Manual Feed Slot (Width/Height) --
Max. Output of Manual Feed Slot (Width/Height) --
Min. Output of Multi-Purpose Tray (W idth/Height) --
Max. Output of Multi-Purpose Tray --
Sheet Weight (Paper tray) 64 - 120
g
/m2
(
17 - 32 lb.
)
64 - 120
g
/m2
(
17 - 32 lb.
)
Sheet Weight (ADF) --
Sheet Weight (Manual Feed Slot) --
Sheet Weight (MP Tray) --
ADF (pages) --
Paper Capacity (sheets) 100 (80 gsm) 100 (80 gsm)
Output Paper Capacity (sheets) 30 30
Optional Paper Tray (sheets) --
Cassette Control Function --
Recommended Paper (Plain/Inkjet/Glossy/
Transparency)
INK JET/JETPRINT Photo proofing paper
GLOSSY/JETPRINT Professional Photo Paper
INK JET/JETPRINT Photo proofing paper
GLOSSY/JETPRINT Professional Photo Paper
LCD Size (Standard size) 16 characters x 2 lines (Standard size) 16 characters x 2 lines
LCD Back Light N/A Yes
On-Screen Programming Yes Yes
LCD Language English English
Memory Capacity (physical: Mbytes) 16 Mbytes (RAM) 16 Mbytes (RAM)
Memory Backup (with battery) N/A Yes
Back Up Print:ON/OFF Feature N/A N/A
Optional Memory N/A N/A
Memory Security N/A N/A
Transmission Lock N/A N/A
Dimensions w/Carton (WxDxH) 20.5"x19.2"x10.0" 21.4"x20.5"x10.0"
Dimensions w/o Carton (WxDxH) 15.7"x16.9"x6.4" 18.2"x16.9"x6.4"
Weight w/Carton 10.1kg 10.8kg
Weight w/o Carton 8.0kg 8.7kg
Body Color Panel : Blue
FB cover : Silver
Emblem : Blue metallic
Tray : Smoke Gray
Panel : Black
FB cover : Silver
Emblem : Black metallic
Tray : Smoke Gray
Power Source 120 VAC 50/60Hz 120 VAC 50/60Hz
Power Consumption(Power OFF/Power Save
(CPU Sleep)/Standby/Peak) N/A/N/A/9.2Wh/21Wh N/A/N/A/9.7W h/22Wh
Energy Star Compliant (USA Only) Yes Yes
Machine Noise (Standby/Peak ex. In printing) 35dBA/45dBA 35dBA/45dBA
Total print pages (Internal counter) Yes (In Maintenance) Yes (In Maintenance)
Copy pages (Internal counter) Yes (In Maintenance) Yes (In Maintenance)
PC print pages (Internal counter) Yes (In Maintenance) Yes (In Maintenance)
Fax RX pages (Internal counter) Yes (In Maintenance) Yes (In Maintenance)
Ink Gauge Indication Yes (in Menu Table/Remote Setup) Yes (in Menu Table/Remote Setup)