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Brother Color Laser Printer
SERVICE MANUAL

MODEL: HL-3450CN

Read this manual thoroughly before commencing any maintenance work.
Keep this manual in a convenient place for quick and easy reference at all times.

January, 2002
SM-PRN028
© Copyright Brother 2002

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.

Trademarks:
The brother logo is a registered trademark of Brother Industries, Ltd.
Apple, the Apple Logo, and Macintosh are trademarks, registered in the United States and other
countries, and True Type is a trademark of Apple computer, Inc.
Epson is a registered trademark and FX-80 and FX-850 are trademarks of Seiko Epson Corporation.
Hewlett Packard is a registered trademark and HP Laser Jet is a trademark of Hewlett Packard
Company.
IBM, IBM PC and Proprinter are registered trademarks of International Business Machines
Corporation.
Microsoft and MS-DOS are registered trademarks of Microsoft Corporation.
Windows is a registered trademark of Microsoft Corporation in the U.S. and other countries.
HL-3450CN SERVICE MANUAL

PREFACE
This service manual contains basic information required for after-sales service of the color laser printer
(here-in-after referred to as "this machine" or "the printer"). This information is vital to the service
technician to maintain the high printing quality and performance of the printer.
This service manual covers the HL-3450CN color laser printer.
This manual consists of the following chapters:

CHAPTER 1: OUTLINE OF PRODUCT
Features, parts names, internal structure, and description of the control panel.

CHAPTER 2: SPECIFICATIONS
Specifications, etc.

CHAPTER 3: INSTALLATION
Installation conditions and installation procedures.

CHAPTER 4: STRUCTURE OF SYSTEM COMPONENTS
Basic operation of the mechanical system, the electrical system and the electrical
circuits and their timing information.

CHAPTER 5: CONTROL PANEL OPERATION
Operation and setting procedures on the control panel.

CHAPTER 6: PERIODIC MAINTENANCE
Description of periodic maintenance parts and procedures for periodic replacement
and cleaning.

CHAPTER 7: DISASSEMBLY
Procedures for replacement of the mechanical system parts.

CHAPTER 8: TROUBLESHOOTING
Description of error messages on the control panel, troubleshooting image failure,
etc.

APPENDICES : SERIAL NO. DESCRIPTIONS, ETC.

Information in this manual is subject to change due to improvement or re-design of the product. All
relevant information in such cases will be supplied in service information bulletins (Technical
Information).
A thorough understanding of this printer, based on information in this service manual and service
information bulletins, is required for maintaining its print quality performance and for improving the
practical ability to find the cause of problems.

i
TABLE OF CONTENTS

TABLE OF CONTENTS

REGULATIONS..................................................................................vi
SAFETY INSTRUCTIONS ................................................................viii
SHIPMENT OF THE PRINTER.........................................................xiii
CHAPTER 1 PRODUCT OUTLINE ................................................. 1-3
1. FEATURES.....................................................................................................1-3
2. PARTS NAMES & FUNCTIONS .....................................................................1-6
3. INTERNAL STRUCTURE ...............................................................................1-8
4. DESCRIPTION OF CONTROL PANEL ..........................................................1-9
4.1 Video Controller Mode .........................................................................................................1-9
4.2 Engine Controller Mode .......................................................................................................1-9

CHAPTER 2 SPECIFICATIONS...................................................... 2-3
1. RATING ..........................................................................................................2-3
2. GENERAL SPECIFICATIONS ........................................................................2-4
2.1 Printing .................................................................................................................................2-4
2.2 Functions .............................................................................................................................2-4
2.3 Electrical and Mechanical ....................................................................................................2-5
2.4 Paper....................................................................................................................................2-6
2.5 Printing Area ........................................................................................................................2-8
3. ENVIRONMENTAL CONDITIONS.................................................................2-11
3.1 Ambient Temperature / Humidity / Altitude ........................................................................2-11

CHAPTER 3 INSTALLATION ......................................................... 3-3
1. CONDITIONS REQUIRED FOR INSTALLATION...........................................3-3
1.1 Environmental Conditions ....................................................................................................3-3
1.2 Basic Layout of Printer Set-up Location...............................................................................3-3
2. UNPACKING...................................................................................................3-5
2.1 Unpacking the Printer ..........................................................................................................3-5
2.2 Unpack the Starter Kit..........................................................................................................3-7
3. INSTALLATION WORK ..................................................................................3-8
3.1 Install the Oil Bottle and Fuser Cleaner ...............................................................................3-8
3.2 Install the OPC Belt Cartridge ..............................................................................................3-9
3.3 Install the Toner Cartridge into the Printer .........................................................................3-11
3.4 Install the Media Cassette and Adaptor .............................................................................3-12
3.5 Test Print............................................................................................................................3-14

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HL-34500CN SERVICE MANUAL

CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS.............. 4-3
1. BASIC STRUCTURE ......................................................................................4-3
1.1 Mechanical Structure ...........................................................................................................4-3
1.2 Basic Mechanism of Color Printing ......................................................................................4-5
1.3 Structure of the OPC Belt ....................................................................................................4-7
1.4 Print System and Transfer System ......................................................................................4-8
1.5 Scanning System ...............................................................................................................4-23
1.6 Paper Transportation System ............................................................................................4-25
1.7 Fusing Unit .........................................................................................................................4-26
2. STRUCTURE OF THE CONTROL SYSTEM.................................................4-28
2.1 Basic Structure - Electrical System and Functions ............................................................4-28
2.2 Control System - Control of the Print Process ...................................................................4-37
2.3 Main PCB (Video Controller PCB) .....................................................................................4-46
2.4 Low-voltage Power Supply Unit .........................................................................................4-60
2.5 High-voltage Power Supply Unit ........................................................................................4-63
2.6 Connection Diagram ..........................................................................................................4-65

CHAPTER 5 CONTROL PANEL OPERATION ............................... 5-3
1. PANEL LAYOUT.............................................................................................5-3
2. VIDEO CONTROLLER MODE........................................................................5-4
2.1 Configuration of Operational Mode ......................................................................................5-4
2.2 Line Test Mode ....................................................................................................................5-5
2.3 DRAM Test Mode ................................................................................................................5-9
2.4 Test Print Mode..................................................................................................................5-10
2.5 NVRAM Reset Mode..........................................................................................................5-10
3. ENGINE CONTROLLER MODE ...................................................................5-11
3.1 Configuration of Operational Mode ....................................................................................5-11
3.2 Operation of Normal Mode.................................................................................................5-13
3.3 Service Mode .....................................................................................................................5-20
3.4 Adjustment Work Procedures ............................................................................................5-44

CHAPTER 6 PERIODIC MAINTENANCE ....................................... 6-3
1. GENERAL.......................................................................................................6-3
1.1 Handling Precautions ...........................................................................................................6-3
1.2 List of Maintenance Tools 6-4
1.3 List of Consumables for Maintenance..................................................................................6-5
2. PERIODIC MAINTENANCE CLEANING .........................................................6-6
2.1 Cleaning the Register Roller ................................................................................................6-9
2.2 Cleaning the Paper Guide..................................................................................................6-10
2.3 Cleaning the Paper Exit Roller ...........................................................................................6-11
2.4 Cleaning the Transfer Roller ..............................................................................................6-12

iii
TABLE OF CONTENTS

2.5 Cleaning the Paper Discharger ..........................................................................................6-13
2.6 Cleaning the OPC Belt Cartridge .......................................................................................6-14
2.7 Cleaning the Transfer Drum...............................................................................................6-15
2.8 Cleaning the Dustproof Glass in the Laser Unit.................................................................6-16
2.9 Cleaning the Printer Interior ...............................................................................................6-17
2.10 Cleaning the Oil Pad ........................................................................................................6-18
3. PERIODIC MAINTENANCE PARTS..............................................................6-19
4. PERIODIC MAINTENANCE PROCEDURES ................................................6-21
4.1 OPC Belt Cartridge Replacement ......................................................................................6-21
4.2 Fusing Unit Replacement...................................................................................................6-23
4.3 Transfer Roller Replacement .............................................................................................6-26
4.4 Paper Discharger Replacement.........................................................................................6-28
4.5 Drum Cleaner Replacement ..............................................................................................6-30
4.6 Ozone Filter Replacement .................................................................................................6-32
4.7 Paper Feeding Roller and Separator Pad Replacement....................................................6-33
4.8 Transfer Drum Replacement..............................................................................................6-34
4.9 Oil Pad Replacement .........................................................................................................6-35

CHAPTER 7 DISASSEMBLY & RE-ASSEMBLY............................ 7-4
1. BEFORE STARTING DISASSEMBLY............................................................7-4
1.1 Precautions ..........................................................................................................................7-4
1.2 Preparation of Disassembly .................................................................................................7-4
2. PARTS NAME.................................................................................................7-6
2.1 Cover ...................................................................................................................................7-6
2.2 Circuit Boards (PWBs) .........................................................................................................7-7
2.3 Motor Units...........................................................................................................................7-7
2.4 Clutches ...............................................................................................................................7-8
2.5 Sensors ................................................................................................................................7-8
3. DISASSEMBLY FLOW ...................................................................................7-9
4. DISASSEMBLY PROCEDURE.....................................................................7-10
4.1 Right Side of the Printer .....................................................................................................7-10
4.2 Top of the Printer ...............................................................................................................7-23
4.3 Left Side of the Printer .......................................................................................................7-32
4.4 Paper Exit Unit ...................................................................................................................7-42
4.5 Front of the Printer .............................................................................................................7-47
4.6 Rear of the Printer..............................................................................................................7-50
4.7 Fusing Unit .........................................................................................................................7-54

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HL-34500CN SERVICE MANUAL

CHAPTER 8 TROUBLESHOOTING ............................................... 8-3
1. OUTLINE OF TROUBLESHOOTING .............................................................8-4
2. OPERATOR CALL..........................................................................................8-5
2.1 Video Controller Mode .........................................................................................................8-5
2.2 Engine Controller Mode .......................................................................................................8-8
3. PAPER TRANSPORT ERROR.....................................................................8-10
3.1 Feed Jam ...........................................................................................................................8-10
3.2 Inner Jam ...........................................................................................................................8-11
3.3 Outer Jam ..........................................................................................................................8-13
3.4 Others ................................................................................................................................8-13
4. SERVICE CALL ............................................................................................8-14
4.1 Video Controller Mode .......................................................................................................8-15
4.2 Engine Controller Mode .....................................................................................................8-18
5. IMAGE FAILURE ..........................................................................................8-47

APPENDIX 1 ................................................................................... A-1
APPENDIX 2 ................................................................................... A-6
APPENDIX 3 ................................................................................... A-7
APPENDIX 4 ................................................................................... A-8
APPENDIX 5 ................................................................................. A-11
APPENDIX 6 ................................................................................. A-14
APPENDIX 7 ................................................................................. A-21
APPENDIX 8 ................................................................................. A-36
APPENDIX 9 ................................................................................. A-38

v
REGULATIONS

REGULATIONS
LASER SAFETY (FOR 110-120 V MODEL ONLY)
This printer is certified as a Class I laser product under the U.S. 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 protective housings and external
covers, the laser beam cannot escape from the machine during any phase of user operation.

FDA REGULATIONS (FOR 110-120 V MODEL ONLY)
U.S. Food and Drug Administration (FDA) has implemented regulations for laser products
manufactured on and after August 2, 1976. Compliance is mandatory for products marketed in the
United States. One of the following labels on the back of the printer indicates compliance with the FDA
regulations and must be attached to laser products marketed in the United States.

Caution
Use of controls, adjustments or performance of procedures other than those specified in this manual
may result in hazardous radiation exposure.

vi
HL-3450CN SERVICE MANUAL

IEC 60825 SPECIFICATION (FOR 220-240 V MODEL ONLY)
This printer is a Class 1 laser product as defined in IEC 60825 specifications. The label shown below
is attached in countries where required.

This printer has a Class 3B Laser Diode which emits invisible laser radiation in the Scanner Unit. The
Scanner Unit should not be opened under any circumstances.

Caution
Use of controls, adjustments or performance of procedures other than those specified in this manual
may result in hazardous radiation exposure.

The following caution label is attached near the laser unit.

5mW
780nm-800nm

DANGER- INVISIBLE LASER RADIATION WHEN OPEN.
AVOID DIRECT EXPOSURE TO BEAM.
VORSICHT- UNSICHTBARE LASERSTRAHLUNG, WENN ABDECKUNG
GEÖFFNET UND SICHERHEITSVERRIEGELUNG
ÜBERBRÜCKT. NICHT DEM STRAHL AUSSETZEN.
DANGER- RAYON LASER INVISIBLE LORS DE L'OUVER TURE.
EVITER L'EXPOSITION DIRECTE.
PELIGRO- RADIACION LASER INVISIBLE AL ABRIR. EVITAR
LA EXPOSICION DIRECTA AL HAZ.

MAS

For Finland and Sweden
LUOKAN 1 LASERLAITE
KLASS 1 LASER APPARAT
Varoitus! Laitteen käyttäminen muulla kuin tässä käyttöohjeessa mainitulla tavalla saattaa altistaa
käyttäjän turvallisuusluokan 1 ylittävälle näkymättömälle lasersäteilylle.

Varning Om apparaten används på annat sätt än i denna Bruksanvisning specificerats, kan
användaren utsättas för osynlig laserstrålning, som överskrider gränsen för laserklass 1.

vii
SHIPMENT OF THE PRINTER

SAFETY INSTRUCTIONS
SAFETY PRINCIPLE
1) Before starting any operations, read this manual thoroughly. Especially read the safety instructions
in this section carefully and ensure that you understand the contents.
2) Perform all the operations by following the procedures described in this manual. Follow all the
cautions and warnings set out in the procedures and on safety labels affixed to the machine.
Failure to do so may result in human injury or equipment damage.
3) Perform only the procedures explained in this manual. Refrain from opening or touching any
portions that are not related to your required operation(s).
4) Repair and replacement of parts should be performed by trained and qualified persons only.
Operators should not attempt to do such repair or replacement work.
5) It must be appreciated that the above-mentioned cautions and warnings do not cover every
circumstance because it is impossible to evaluate all the conditions of repair situations.

SPECIAL SAFETY INFORMATION
Introductory Information
Cautions and warnings are made clear by them following a `Safety Alert Symbol' or `Signal Word' such
as DANGER, WARNING and CAUTION.

This is the safety alert. When you find this symbol placed on the equipment or marked in this manual,
be aware of the potential of human injuries. Follow the recommended precautions and safety
operation practices.

DANGER is used to indicate the presence of a hazard which will cause severe human injuries or a fatal
accident if the warning is ignored.
WARNING is used to indicate the presence of a hazard or unsafe practices which may cause severe
human injuries or a fatal accident if the warning is ignored.
CAUTION is used to indicate the presence of a hazard or unsafe practices which may cause minor
human injuries if the warning is ignored. CAUTION also calls your attention to safety messages in this
manual.

Carefully read all the safety messages set out in this manual and also in the safety warning signs
placed on the equipment. In this manual, the safety instructions (safety alert symbols and signal
words) are enclosed in a rectangular enclosure to bring them to your attention. Keep the safety signs
on the equipment in good condition and ensure none are missing or damaged. Replace the safety
signs if unreadable or damaged. Learn how to operate the equipment and how to use the controls
properly. Do not let anyone operate this equipment without following the instructions. Keep the
equipment in proper working condition. Unauthorized modification to the equipment may impair the
function & safety and affect the life of the equipment.
Listed below are the various kinds of "WARNING" messages contained in this manual.

There is a danger of explosion if the battery is incorrectly replaced.
Do not replace the battery.
Do not disassemble, recharge or dispose of in fire.
Used battery should be disposed of according to local regulations.

viii
HL-3450CN SERVICE MANUAL

WARNING
HAZARDOUS VOLTAGE
May cause serious injuries or fatal accidents. Voltage is now applied from the power
supply of printer. There is a danger of electrical shock if you touch the active area
inside the printer.
Be sure to turn the power supply switch OFF and pull the plug out from the power
outlet before starting maintenance work on the printer.

WARNING
HARMFUL OZONE GAS
Inhalation of an excessive amount of ozone gas may adversely affect the respiratory
organs.
An Ozone Filter is fitted to this printer to reduce the exhausted ozone. This filter
must be replaced with a new filter periodically in accordance with the manual
supplied with the printer.

WARNING
HOT SURFACE
The Fusing Unit reaches a temperature of approx.160°C and adjacent parts are also
very hot.
When you need to change the cleaning pad or remove jammed paper, wait about 20
minutes after opening the paper exit unit to allow the unit to cool down.

CAUTION
ROTATING PARTS
Be aware of the potential danger of various rollers and take care not to get your
fingers or hand caught in the machine, this can cause serious injuries. Note that the
exit roller that ejects the printed paper rotates during printing.
Be careful not to get your hair, fingers, hands, sleeve or necktie caught in the
machine while operating the machine.

ix
SHIPMENT OF THE PRINTER

CAUTION
HAZARDOUS POWDER
Toner is a fine powder which can cause a powder explosion if disposed of into a fire.
Under no circumstances dispose of toner into a fire.

CAUTION
HAZARDOUS POWDER
Toner is a fine powder which may cause irritation to the eyes and respiratory organs
if inhaled.
Handle the toner cartridge, waste toner pack and developing unit carefully so as not
to spill the toner.

CAUTION
POWER CORDS & PLUGS
This printer is equipped with a 3-wire power cord fitted with a 3-pronged plug (bi-
polar plug with grounding) for the user's safety.
Use these power cords in conjunction with a properly grounded electrical outlet to
avoid an electrical shock.

CAUTION
SAFETY INTERLOCK
The front cover, paper exit unit and transfer unit of this printer have electrical safety
interlocks to turn the power off whenever they are opened. Do not attempt to
circumvent these safety interlocks.

CAUTION
N Do not step on or lean against the media cassette. It may cause the product to tilt
or fall over and result in injuries.
N Do not lean against or apply any excessive force to the media cassette or open
covers, otherwise it may cause the product to tilt or fall over and result in injuries.

x
HL-3450CN SERVICE MANUAL

CAUTION
Do not lean against or apply any excessive force to the paper cassette, open cover
of Duplex unit. Otherwise it may cause the product to decline or fall down and result
in the injuries.

xi
SHIPMENT OF THE PRINTER

5
1

4

3

2

1. Hot Caution Label WARNING WARNUNG AVERTISSEMENT
Hot surface. Heiße oberfiäche. Surface chaude.
Avoid contact. Bei beseitigung. Eviter tout contact.

2. Laser Caution Label

5mW
780nm-800nm

DANGER- INVISIBLE LASER RADIATION WHEN OPEN.
AVOID DIRECT EXPOSURE TO BEAM.
VORSICHT- UNSICHTBARE LASERSTRAHLUNG, WENN ABDECKUNG
GEÖFFNET UND SICHERHEITSVERRIEGELUNG
ÜBERBRÜCKT. NICHT DEM STRAHL AUSSETZEN.
DANGER- RAYON LASER INVISIBLE LORS DE L'OUVER TURE.
EVITER L'EXPOSITION DIRECTE.
PELIGRO- RADIACION LASER INVISIBLE AL ABRIR. EVITAR
LA EXPOSICION DIRECTA AL HAZ.

MAS

xii
HL-3450CN SERVICE MANUAL

3. Rating Label
(For US)

(For Europe)

4. Operation Label

5. Jam Label

xiii
SHIPMENT OF THE PRINTER

SHIPMENT OF THE PRINTER
If for any reason you must ship the printer, carefully package the printer to avoid any damage during
transit. It is recommended that you save and use the original packaging. The printer should also be
adequately insured with the carrier.

CAUTION
N When shipping the printer, remove the toner cartridges, the OPC belt cartridge
and the waste toner pack from the printer to prevent toner spill in the printer or
damage of the toner cartridge and the OPC belt cartridge.
N When shipping the printer, remove the oil bottle and the fuser cleaner from the
fusing unit. After removing the oil bottle, be sure to remove the oil remaining in the
fusing unit with the supplied syringe. Failure to do so will cause severe damage to
the printer.

xiv
HL-3450CN SERVICE MANUAL

CHAPTER 1
PRODUCT OUTLINE
CHAPTER 1 PRODUCT OUTLINE

CONTENTS

CHAPTER 1 PRODUCT OUTLINE ..................................................... 1-3
1. FEATURES.......................................................................................................... 1-3
2. PARTS NAMES & FUNCTIONS .......................................................................... 1-6
3. INTERNAL STRUCTURE .................................................................................... 1-8
4. DESCRIPTION OF CONTROL PANEL ............................................................... 1-9
4.1 Video Controller Mode................................................................................................................. 1-9
4.2 Engine Controller Mode............................................................................................................... 1-9

1-2
HL-3450CN SERVICE MANUAL

CHAPTER 1 PRODUCT OUTLINE

1. FEATURES

This printer has the following features:

2400 x 600 dpi Class Resolution
The printer prints pages with a resolution of 600 dots per inch (dpi) as default. It also
provides higher quality printout which is the equivalent of 2400 x 600 dpi resolution when
using High Resolution Control (HRC) or Color Advanced Photoscale Technology (CAPT).

High Speed Color Laser Printing
The printer allows crisp printing in 24 bit brilliant color. The printer prints at a speed of 24
pages per minute in monochrome mode and 6 pages per minute in full color mode when
printing A4 or Letter size paper in Landscape orientation. The controller utilizes a high speed
32-bit RISC microprocessor and special hardware chips, which provides a very fast
processing speed.

High Resolution Control (HRC)
The high resolution control (HRC) technology provides clear and crisp printouts and improves
even the 600 dpi resolution. This mode is effective when printing text data.

Color Advanced Photoscale Technology (CAPT)
®
The printer can print graphics in 256 shades for each color in HP color printer PCL5CTM and
BR-Script 3 emulations, producing nearly photographic quality. This mode is effective when
printing photographic images.

Maintenance-Free & Economical Toner Cartridge
A toner cartridge can print up to 14,000 (Black) and 8,500 (Cyan, Magenta and Yellow)
single-sided pages at 5% coverage. The one piece, easy-to-replace toner cartridges do not
require difficult maintenance.

Universal Media Cassette
This printer loads paper automatically from the media cassette. Since the media cassette is
a universal type, a number of different sizes of paper can be used. Even envelopes can be
loaded from the media cassette.

Three Interfaces
This printer has a high speed, bi-directional parallel interface, USB and Ethernet
10/100BaseTX.

If your application software supports the bi-directional parallel interface, you can monitor the
printer status. It is fully compatible with the industry-standard bi-directional parallel interface.

The Brother network board (NC-4100h) is factory installed in the HL-3450CN, which enables
you to use this printer in the TCP/IP, IPS/SPX, Apple Talk, DLC/LLC, Banyan VINES, DEC
LAT and NetBEUI environments. Also, many useful utilities, such as BRAdmin Professional
for the administrator and Brother network printing software, are included in the CD-ROM
supplied with the HL-3450CN printer. For setup, see the Network User's Guide.

1-3
CHAPTER 1 PRODUCT OUTLINE

Automatic Interface Selection
The printer can automatically select the bi-directional parallel, USB, or Ethernet 10/100 Base
TX depending on the interface port through which it receives data. With this feature, the
printer can be connected to more than one computer.

Five Emulation Modes
® ® ®
The printer can emulate Hewlett-Packard Color PCL 5C language (PCL6 in monochrome
®
mode), PostScript 3 language emulation (Brother BR-Script 3) printers, the industry-
® ® ®
standard HP-GLTM plotter as well as EPSON FX-850TM, and IBM Proprinter XL printers (in
monochrome mode). It is possible to print with all application programs that support one of
these printers.

Automatic Emulation Selection
The printer can automatically select the printer emulation mode depending on the print
commands it receives from the computer software. With this feature, many users can share
the printer on a network.

Data Compression Technology
The printer can internally compress the received graphics and font data in its memory so that
it can print larger graphics and more fonts without additional memory.

Various Fonts
The printer has 66 scalable and 12 bitmapped fonts. The fonts that can be used will vary
according to the selected emulation mode.
In PCL mode, you can also print the 13 kinds of bar codes listed below. In BR-Script mode,
the printer has 165 scalable fonts.

< Bar Code Printing >
This printer can print the following 13 types of bar codes:
N Code 39 N ISBN (EAN) N EAN-8 N Post Net
N Code 128 N ISBN (UPC-E) N EAN-13 (US-PostNet)
N Interleaved 2 of 5 N UPC-A N EAN-128
N Codabar N UPC-E N FIM (US-PostNet)

CCITT G3/G4
Since the printer supports the CCITT G3/G4 format in addition to HP-compatible formats, it
can quickly receive and print data compressed in this format.

Lock Panel
If the panel button settings have been changed, the printer may not work as expected. It is
possible for the administrator of the printer to lock the settings to prevent changes from being
made.

Power Save Mode
The printer has a power save mode. As laser printers consume power to keep the fixing
assembly at a high temperature, this feature can save electricity when the printer is on but
not being used. The factory setting of the Power Save mode is ON so that it complies with
the new EPA Energy Star new specification.

1-4
HL-3450CN SERVICE MANUAL

Toner Save Mode
The printer has an economical toner save mode. This mode allows you to reduce the printer
running cost substantially in addition to the improved life expectancy of the toner cartridge.

Reprint Function
A touch of a panel button allows reprinting of the last print job without sending the data again
from the computer. When there is not enough memory to print the last complete job out, the
last print page can be reprinted. Data can be stored in an IDE HDD that can be optionally
installed. It can be reprinted by selecting a document from the control panel or the browser.
When the private print driver is selected, Secure Printing can be executed which allows you
to print only when a password is entered.

Saving User Settings
It is possible to operate the printer differently from other users with the panel button settings.
One set of user settings can be stored.

®
*PANTONE Calibrated
There are many variables in process reproduction of colors generated by the HL-3450CN,
any one of which may affect the quality of the PANTONE Color simulation, including;
N Type of paper used
N Type of toner used
N Effective final resolution
N Dot structure/halftones
For optimal results, it is recommended that the following materials and settings are used.
1) NEUSIEDLER color copy paper
2) Brother Toner Cartridges TN-02 BK/C/M/Y
3) 600 x 600 dpi resolution

1-5
CHAPTER 1 PRODUCT OUTLINE

2. PARTS NAMES & FUNCTIONS

1. Upper cover
2. Control panel

4. Top cover
(Paper Exit Unit)

5. Power button

3. Front cover

Media cassette

Fig. 1-1

Paper exit unit

8. Controller box

6. Power inlet

7. Rear access cover

Fig. 1-2

1-6
HL-3450CN SERVICE MANUAL

No. Part Name Outline of Functions

To act as an upper enclosure and also as a
1 Upper cover
paper tray for printed paper.

To display the status of printer operations and
2 Control panel
control the printer directly.

To act as a front enclosure, opened when
3 Front cover
replacing a toner cartridge or waste toner pack.

To exit the printed paper onto the upper cover,
Top cover (Paper exit acting also as part of the paper tray for printed
4
unit) paper. To be opened when replacing an OPC
belt cartridge or Drum cleaner.

To operate power-on and off to the printer.
5 Power button
(Push for On/Off operation)

6 Power inlet To connect a power supply cable.

To act as a rear enclosure, opened when
7 Rear access cover clearing an internal jam or doing maintenance
work.

Space where the main (video controller) PCB is
8 Controller box
installed.

1-7
CHAPTER 1 PRODUCT OUTLINE

3. INTERNAL STRUCTURE

2. OPC Belt Cartridge

3. Drum Cleaner
4. Fusing Unit 1. Toner Cartridge
(K, Y, M, C)

K

Y

M
11. Laser Unit
C

7. Paper Discharger 9. Media Cassette

8. Transfer Roller

5. Transfer Unit
6. Transfer Drum

10. Paper Pick-up
Roller
Fig. 1-3

No. Components Name Outline of Functions
Contain the toner (K, Y, M, C) for developing.
1 Toner Cartridge
Each toner cartridge (K, Y, M, C) is independent.
2 OPC Belt Cartridge Forms images and includes the OPC belt.
Cleans and collects waste toner adhering to the transfer
3 Drum Cleaner
drum.
4 Fusing Unit Fixes by heat and pressure the toner image onto the paper.
5 Transfer unit Transfers toner images from the transfer drum to the paper.
Forms color images, combining the toner images from the
6 Transfer Drum
OPC belt on the drum.
Emits a corona charge for separating the paper from the
7 Paper Discharger
transfer drum.
8 Transfer Roller Transfers the toner image on the transfer drum to the paper.
9 Media Cassette Feeds paper automatically.
10 Paper Pick-up Roller Feeds paper automatically from the media cassette.
Generates a modulated laser beam and scans the OPC belt
11 Laser Unit
to produce the image.

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HL-3450CN SERVICE MANUAL

4. DESCRIPTION OF CONTROL PANEL

The printer control panel provides control of the printer including test printing, maintenance
operations performed by the video controller and also the ones which are performed by the
engine controller.
The Video Controller Mode and the Engine Controller Mode have some common functions.
Under normal circumstances the functions in the Video controller mode will be used. Refer to
CHAPTER 5 for further information.

4.1 Video Controller Mode
The printer goes into the Video Controller Mode when the power is turned on by pressing the
power button.
The Video Controller Mode supplies the general test printing and setting functions and some
of the maintenance operations. If further engine settings are required, use the Engine
Controller Mode.

4.2 Engine Controller Mode
The printer goes into the Engine Controller Mode when power is turned on by pressing the
power button at the same time as holding down the Secure print, Back and Set buttons.
(Refer to Fig.1-4.)

NOTE:
This mode provides unique control panel display and operation functions which are
completely different from the ones described on the actual control panel labels or in the
user's guide. Refer to CHAPTER 5 for detailed information.

1-9
CHAPTER 1 PRODUCT OUTLINE

1

K C M Y

3

2 4
Power Ready Data

5
6
7
Alarm
Go Job 9
Cancel

8 10

Secure 12
Print
Menu
11 13

Reprint Back Set

Fig. 1-4

No. LED / Button Name
1 LCD: 16 character by 2 lines
2 Power LED
3 Ready LED
4 Data LED
5 Go button
6 Job Cancel button
7 Alarm LED
8 Secure Print button
9 - button
10 + button
11 Reprint button
12 Back button
13 Set button

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HL-3450CN SERVICE MANUAL

CHAPTER 2
SPECIFICATIONS
CHAPTER 2 SPECIFICATIONS

CONTENTS

CHAPTER 2 SPECIFICATIONS.......................................................... 2-3
1. RATING .............................................................................................................. 2-3
2. GENERAL SPECIFICATIONS ............................................................................ 2-4
2.1 Printing ....................................................................................................................................... 2-4
2.2 Functions .................................................................................................................................... 2-4
2.3 Electrical and Mechanical........................................................................................................... 2-5
2.4 Paper .......................................................................................................................................... 2-6
2.4.1 Printable media .................................................................................................................... 2-6
2.4.2 Media cassette capacity ...................................................................................................... 2-8
2.4.3 Printed output....................................................................................................................... 2-8
2.5 Printing Area............................................................................................................................... 2-8
2.5.1 Effective printable area ........................................................................................................ 2-8
2.5.2 Print guarantee area .......................................................................................................... 2-10
3. ENVIRONMENTAL CONDITIONS..................................................................... 2-11
3.1 Ambient Temperature / Humidity / Altitude............................................................................... 2-11

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HL-3450CN SERVICE MANUAL

CHAPTER 2 SPECIFICATIONS

1. RATING

WARNING
Use the power supply cable supplied with the printer, or a similar cable complying
with the following specification (3-wire power cable with ground).
Use of an "out of specification" cable may result in an electric shock.

Destination Voltage (V) Frequency (Hz) Input Current (A) Power Cord (Piece)
US / Canada 120 50/60 11 1
Europe 220 - 240 50/60 6 1*

* For European models, the power supply cable depends on the country as follows;

Figure Rating Approval Agency Applicable Area

A VDE, DEMKO, SEV Europe (Continent)
250VAC, 6A
B BS UK

Figure A: For Europe (Sample)

2.5m

Figure B: For UK

2.5m

NOTE:
For details of other power supply cables, refer to the parts reference list.

** For rating labels, refer to `Safety Instruction' on Page viii.

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CHAPTER 2 SPECIFICATIONS

2. GENERAL SPECIFICATIONS

2.1. Printing
Print method Electro photography by semiconductor laser beam scanning
Laser Wavelength: 780nm
Output: 5mW max.
Resolution 600 x 600 dots per inch (Fine)
2400 x 600 dots per inch (using HRC and CAPT)
(The resolution can be enhanced to 2400dpi class by using Brother
exclusive HRC (High Resolution Control) and CAPT (Color Advanced
Photoscale Technology).)
Print speed Monochrome mode: 24 page/minute
Full color mode: 6 page/minute
(when printing A4/Letter-size paper in Landscape orientation)
Monochrome mode: 12 page/minute
Full color mode: 3 page/minute
(when printing A3/Ledger-size paper in Portrait orientation)
Warm-up Max. 210 seconds at 20°C (68°F)
First print Monochrome mode: 19 seconds or less
Full color mode: 34 seconds or less
(when loading A4/Letter-size plain paper in Landscape orientation by
face down print delivery from standard upper cassette feed)
Print media Toner in a single-color single-component cartridge.
Life Expectancy: 14,000 single-sided pages/cartridge (Black)
8,500 single-sided pages/cartridge (C/M/Y)
(when printing on A4/Letter-size paper with 5% coverage)
Resident printer fonts
66 scalable fonts and 12 bitmapped fonts,11 bar codes

165 scalable fonts

2.2. Functions
CPU Toshiba TMPR4955-266 (TX4955-266MHz)
Emulation Automatic emulation selection
x HP Color Printer (PCL5C) including HP LaserJet 4+ (PCL5e) and
HP LaserJet 5 (PCL6 monochrome)
x BR-Script 3 (Adobe PostScript 3 compatible)
x HP-GL
x EPSON FX-850
x IBM Proprinter XL
Interface Automatic interface selection among the bi-directional parallel,
Universal Serial Bus (USB) and Ethernet 10/100 Base TX.
RAM 64 Mbytes
(Expandable up to 384Mbytes with DIMMs)
The standard memory fitted can vary depending on the printer model
and country.
HDD option 2.5 inch IDE HDD
Compact Flash 1 card slot: Compact Flash Type II
Control panel 8 buttons, 4 LEDs and a 16-column x 2 lines liquid crystal display
Diagnostics Self-diagnostic program

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HL-3450CN SERVICE MANUAL

2.3. Electrical and Mechanical
Power source U.S.A. and Canada: AC 120V, 50/60Hz
Europe and Australia: AC 220 to 240V, 50/60Hz

Power consumption Printing (peak*): 1350W or less
Printing (average): 600W or less
Standing by (peak*): 1350W or less
Standing by (average): 200W or less
Sleep: 30W or less

Noise: Printing: 55dB A or less
Standing by: 48dB A or less

Temperature: Operating: 10 to 32.5°C (50 to 90.5°F)
Non operating: 5 to 35°C (41 to 95°F)
Storage: 0 to 35°C (38 to 95°F)

Humidity: Operating: 20 to 80% (non condensation)
Storage: 10 to 90% (non condensation)

Dimensions: 615 x 540 x 420 mm (24.2 x 21.3 x 16.5 inches)
(W x D x H) 615 x 620 x 610 mm (24.2 x 24.4 x 24.0 inches)
with the Duplex Unit and one optional lower tray unit fitted
615 x 620 x 750 mm (24.2 x 24.4 x 30.6 inches)
with the Duplex Unit and two optional lower tray units fitted

Weight: Approx. 46kg (101lbs.)
Approx. 54kg (119lbs.) including consumables*

*Consumables are defined as:
Belt cartridge, Toner cartridge (Y, M, C, K), Fuser oil bottle,
Fuser cleaning roller, Waste toner Pack
Optional Units:
N Lower Tray Unit: Approx. 11kg (24lbs.)
N Duplex Unit: Approx. 12kg (26lbs.)

N Standard Media Cassette: Approx. 2.1kg (4.6lbs.)

N Lower Tray Unit Media Cassette: Approx. 2.7kg (6.0lbs.)

*NOTE:
x The peak figure of power consumption is worked out when the halogen heater lamp is
turned ON.
x The peak figure of power consumption is worked out excluding inrush current value.
x The peak figure of power consumption is a reference value and should be used internally
at Brother offices only.
x The power consumption figure quoted for sleep mode is when the fan has stopped.

2-5
CHAPTER 2 SPECIFICATIONS

2.4. Paper
The standard media cassette (upper cassette) is supplied with the printer. The optional lower
tray unit and the optional A4/Letter cassette can also be installed.
NOTE:
The standard upper cassettes and the optional A4/Letter cassette are interchangeable
between the upper and the lower feeder.

2.4.1 Printable media
(1) Type & size
Paper source Paper type Paper Size
Standard upper cassette Plain paper A3, B4, A4, Ledger, Executive, Legal,
Letter, B5 (ISO/JIS), 330x483mm
(13"x19")
Envelope COM10, DL,
Transparency A4, Letter
Label A4, Letter
Other size width 210-330mm (8.2"-12.9")
length 176-483mm (6.9"-18.8")
Optional lower cassette Plain paper A3, B4, A4, B5 (ISO/JIS), Legal, Ledger,
Letter
Optional A4/Letter cassette Plain paper A4, Letter, B5 (ISO/JIS), Executive
Envelope: COM10, DL
Transparency A4, Letter