Canon MF4500 Series User manual

87654321
Service Manual Rev.1
MF4500/MF4400/D500 Series
Product Overview
Technical Overview
Periodical Services
Disassembly/Assembly
Adjustment
Trouble Shooting
Error Codes
Service Mode
Appendix

Application
This manual has been issued by Canon Inc. for qualied persons to learn technical theory,
installation, maintenance, and repair of products. This manual covers all localities where the
products are sold. For this reason, there may be information in this manual that does not
apply to your locality.
Corrections
This manual may contain technical inaccuracies or typographical errors due to improvements
or changes in products. When changes occur in applicable products or in the contents of this
manual, Canon will release technical information as the need arises. In the event of major
changes in the contents of this manual over a long or short period, Canon will issue a new
edition of this manual.
The following paragraph does not apply to any countries where such provisions are
inconsistent with local law.
Trademarks
The product names and company names used in this manual are the registered trademarks
of the individual companies.
Copyright
This manual is copyrighted with all rights reserved. Under the copyright laws, this manual may
not be copied, reproduced or translated into another language, in whole or in part, without the
consent of Canon Inc.
© CANON INC. 2010
Caution
Use of this manual should be strictly supervised to avoid disclosure of condential
information.

Explanation of Symbols
The following symbols are used throughout this Service Manual.
Symbols Explanation Symbols Explanation
Check. Remove the claw.
Check visually. Insert the claw.
Check the noise. Use the bundled part.
Disconnect the connector. Push the part.
Connect the connector. Plug the power cable.
Remove the cable/wire
from the cable guide or wire
saddle.
Turn on the power.
Set the cable/wire to the
cable guide or wire saddle.
Remove the screw.
Tighten the screw.
The following rules apply throughout this Service Manual:
1. Each chapter contains sections explaining the purpose of specic functions and the
relationship between electrical and mechanical systems with reference to the timing of
operation.
In the diagrams, represents the path of mechanical drive; where a signal name
accompanies the symbol, the arrow indicates the direction of the electric signal.
The expression "turn on the power" means ipping on the power switch, closing the front
door, and closing the delivery unit door, which results in supplying the machine with power.
2. In the digital circuits, '1' is used to indicate that the voltage level of a given signal is "High",
while '0' is used to indicate "Low". (The voltage value, however, differs from circuit to
circuit.) In addition, the asterisk (*) as in "DRMD*" indicates that the DRMD signal goes on
when '0'.
In practically all cases, the internal mechanisms of a microprocessor cannot be checked
in the eld. Therefore, the operations of the microprocessors used in the machines are not
discussed: they are explained in terms of from sensors to the input of the DC controller
PCB and from the output of the DC controller PCB to the loads.
The descriptions in this Service Manual are subject to change without notice for product
improvement or other purposes, and major changes will be communicated in the form of
Service Information bulletins.
All service persons are expected to have a good understanding of the contents of this Service
Manual and all relevant Service Information bulletins and be able to identify and isolate faults
in the machine.

Contents
0 Safety Precautions
CDRH Provisions -------------------------------------------------------------0-2
Laser Safety --------------------------------------------------------------------0-2
About Laser Beams --------------------------------------------------------------- 0-2
Handling Laser Scanner Unit --------------------------------------------------- 0-2
Toner Safety --------------------------------------------------------------------0-3
About Toner ------------------------------------------------------------------------- 0-3
Handling Adhered Toner --------------------------------------------------------- 0-3
Notes on Handling Lithium Battery ---------------------------------------0-3
Notes on Assembly/Disassembly -----------------------------------------0-3
1 Product Overview
Product Lineups ---------------------------------------------------------------1-2
Main Unit ----------------------------------------------------------------------------- 1-2
Options ------------------------------------------------------------------------------- 1-3
Features -------------------------------------------------------------------------1-4
Features ------------------------------------------------------------------------------ 1-4
Product Specications -------------------------------------------------------1-4
Main Unit Specications ---------------------------------------------------------- 1-4
SADF/DADF Specications ----------------------------------------------------- 1-6
FAX Specications ----------------------------------------------------------------- 1-6
Name of Parts ------------------------------------------------------------------1-7
External View ----------------------------------------------------------------------- 1-7
MF4420n/MF4410/MF4412/D520 ------------------------------------------------------ 1-7
MF4570dn/MF4550d/MF4553d/MF4554d/MF4450/MF4452/MF4453/MF4430 -
1-8
MF4580dn/D550 ---------------------------------------------------------------------------- 1-9
Cross Section ----------------------------------------------------------------------1-10
MF4550d/MF4553d/MF4554d/MF4570dn/MF4580dn/D520/D550 -----------1-10
MF4410/MF4412/MF4420n/MF4430/MF4450/MF4452/MF4453 --------------1-10
Control Panel ---------------------------------------------------------------------- 1-11
2 Technical Overview
Basic Conguration -----------------------------------------------------------2-2
Conguration function ------------------------------------------------------------ 2-2
Basic Sequence -------------------------------------------------------------------- 2-2
Basic Sequence of Operation ----------------------------------------------------------- 2-2
Print Sequence ------------------------------------------------------------------------------ 2-3
Controller System -------------------------------------------------------------2-4
Main Controller --------------------------------------------------------------------- 2-4
General description ------------------------------------------------------------------------ 2-4
Engine Controller ------------------------------------------------------------------ 2-4
General description ------------------------------------------------------------------------ 2-4
Service Works ---------------------------------------------------------------------- 2-5
At parts replacement ----------------------------------------------------------------------- 2-5
Maintenance --------------------------------------------------------------------------------- 2-5
Notes on service works ------------------------------------------------------------------- 2-5
Document Exposure/Feeder System ------------------------------------2-6
Document Exposure System ---------------------------------------------------- 2-6
Overview -------------------------------------------------------------------------------------- 2-6
Major Components ------------------------------------------------------------------------- 2-6
Document Feeder System ------------------------------------------------------- 2-7
Overview -------------------------------------------------------------------------------------- 2-7
Various Control ------------------------------------------------------------------------------ 2-9
Service Works ---------------------------------------------------------------------2-10
At parts replacement ----------------------------------------------------------------------2-10
Maintenance --------------------------------------------------------------------------------2-10
Notes on service works ------------------------------------------------------------------2-10
Laser Exposure System --------------------------------------------------- 2-11
Overview ---------------------------------------------------------------------------- 2-11
Overview ------------------------------------------------------------------------------------- 2-11
Controlling the Laser Activation Timing --------------------------------------2-12
Laser ON/OFF Control -------------------------------------------------------------------2-12
Horizontal Sync Control ------------------------------------------------------------------2-12
Laser Control -----------------------------------------------------------------------2-13
Auto Power Control (APC) --------------------------------------------------------------2-13
Laser Scanner Motor Control --------------------------------------------------2-13
Overview -------------------------------------------------------------------------------------2-13
Scanner Motor Fault Detection ---------------------------------------------------------2-14

Service Works ---------------------------------------------------------------------2-14
At parts replacement ----------------------------------------------------------------------2-14
Maintenance --------------------------------------------------------------------------------2-14
Notes on service works ------------------------------------------------------------------2-14
Image Formation System ------------------------------------------------- 2-15
Overview/Conguration ---------------------------------------------------------2-15
Overview -------------------------------------------------------------------------------------2-15
Print Process --------------------------------------------------------------------------------2-15
Static Latent Image Formation Block -------------------------------------------------2-16
Development Block------------------------------------------------------------------------2-17
Transfer Block ------------------------------------------------------------------------------2-17
Fixing Block ---------------------------------------------------------------------------------2-18
Drum Cleaning Block ---------------------------------------------------------------------2-18
High-Voltage Control -------------------------------------------------------------2-19
Overview -------------------------------------------------------------------------------------2-19
Generating Primary Charging Bias ----------------------------------------------------2-19
Generating Developing Bias ------------------------------------------------------------2-19
Generating Transfer Bias ----------------------------------------------------------------2-19
Toner Cartridge --------------------------------------------------------------------2-20
Toner Level Detection --------------------------------------------------------------------2-20
Specication of Toner level display ----------------------------------------------------2-20
Operation when toner level is Low/Nearly Out -------------------------------------2-20
Toner Cartridge Absence/Presence Detection -------------------------------------2-21
Service Works ---------------------------------------------------------------------2-21
At parts replacement ----------------------------------------------------------------------2-21
Maintenance --------------------------------------------------------------------------------2-21
Notes on service works ------------------------------------------------------------------2-21
Fixing System ---------------------------------------------------------------- 2-22
Overview/Conguration ---------------------------------------------------------2-22
Overview -------------------------------------------------------------------------------------2-22
Main Parts of Fixing assembly ---------------------------------------------------------2-22
Various Control Mechanisms --------------------------------------------------2-23
Fixing Temperature Control -------------------------------------------------------------2-23
Protective Functions ----------------------------------------------------------------------2-23
Throughput Down Control ---------------------------------------------------------------2-25
Service Works ---------------------------------------------------------------------2-25
At parts replacement ----------------------------------------------------------------------2-25
Maintenance --------------------------------------------------------------------------------2-25
Notes on service works ------------------------------------------------------------------2-25
Pickup And Feeding System --------------------------------------------- 2-26
Overview ----------------------------------------------------------------------------2-26
Overview -------------------------------------------------------------------------------------2-26
Detecting Jams --------------------------------------------------------------------2-27
Jam Detection Outline --------------------------------------------------------------------2-27
Delay Jams ----------------------------------------------------------------------------------2-28
Stationary Jams ----------------------------------------------------------------------------2-30
Other Jams ----------------------------------------------------------------------------------2-31
Service Works ---------------------------------------------------------------------2-32
At parts replacement ----------------------------------------------------------------------2-32
Maintenance --------------------------------------------------------------------------------2-32
Notes on service works ------------------------------------------------------------------2-32
External And Controls System ------------------------------------------- 2-33
Power Supply ----------------------------------------------------------------------2-33
Power Supply -------------------------------------------------------------------------------2-33
Protective Functions ----------------------------------------------------------------------2-33
Service Works ---------------------------------------------------------------------2-34
At parts replacement ----------------------------------------------------------------------2-34
Maintenance --------------------------------------------------------------------------------2-34
Notes on service works ------------------------------------------------------------------2-34
3 Periodical Services
Periodically Replaced Parts ------------------------------------------------3-2
Periodically Replaced Parts ----------------------------------------------------- 3-2
Consumables ------------------------------------------------------------------3-2
Consumables ----------------------------------------------------------------------- 3-2
Periodical Service -------------------------------------------------------------3-3
Scheduled Servicing -------------------------------------------------------------- 3-3
Cleaning -------------------------------------------------------------------------3-3
Printer --------------------------------------------------------------------------------- 3-3
Reader ADF ------------------------------------------------------------------------- 3-4
SADF ------------------------------------------------------------------------------------------ 3-4
DADF ------------------------------------------------------------------------------------------ 3-4
4 Disassembly/Assembly
Outline ---------------------------------------------------------------------------4-2

List of Parts ---------------------------------------------------------------------4-3
External View ----------------------------------------------------------------------- 4-3
List of External Cover/Interior: DADF Models
(MF4580dn/D550) -------------------------------------------------------------------------- 4-3
List of External Cover/Interior: SADF Models
(MF4570dn/MF4550d/MF4553d/MF4554d/MF4450/MF4452/MF4453/
MF4430) -------------------------------------------------------------------------------------- 4-4
List of External Cover/Interior: Copyboard Models
(MF4420n/MF4410/MF4412/D520) ---------------------------------------------------- 4-6
Main Unit ----------------------------------------------------------------------------- 4-7
Lists of DADF Unit and Reader Unit: FAX Models
(MF4580dn) ---------------------------------------------------------------------------------- 4-7
Lists of DADF Unit and Reader Unit: Models without FAX
(D550) ----------------------------------------------------------------------------------------- 4-8
Lists of SADF Unit and Reader Unit: FAX Models
(MF4570dn/MF4550d/MF4553d/MF4554d/MF4450/MF4452/MF4453) ------ 4-8
Lists of SADF Unit and Reader Unit: Models without FAX
(MF4430) ------------------------------------------------------------------------------------- 4-9
Lists of Copyboard Cover and Reader Unit
(MF4420n/MF4410/MF4412/D520) ---------------------------------------------------4-10
List of 2-sided Printer Unit
(MF4580dn/MF4550d/MF4570dn/D520/D550) ------------------------------------4-10
List of 1-sided Printer Unit
(MF4450/MF4452/MF4453/MF4430/MF4420n/MF4410/MF4412) ------------ 4-11
Location of Electric parts -------------------------------------------------------- 4-11
List of DADF Unit -------------------------------------------------------------------------- 4-11
List of SADF Unit --------------------------------------------------------------------------4-12
List of Reader Unit-------------------------------------------------------------------------4-12
List of 2-sided Printer Unit
(MF4580dnMF4570dn/MF4550d/MF4553d/MF4554d/D550/D520) ----------4-12
List of 1-sided Printer Unit
(MF4450/MF4452/MF4453/MF4430/MF4420n/MF4410 /MF4412) -----------4-16
List of Connectors ----------------------------------------------------------- 4-21
DADF Unit
(MF4580dn/D550) ----------------------------------------------------------------4-21
SADF Unit
(MF4570dn/MF4550d/MF4553d/MF4554d/MF4450/MF4452/MF4453/
MF4430) -----------------------------------------------------------------------------4-21
Reader Unit -------------------------------------------------------------------------4-22
2-sided Printer Unit
(MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/D550/D520) 4-22
1-sided Printer Unit
(MF4450/MF4452/MF4453/MF4430/MF4420n/MF4410/MF4412) ---4-24
External Cover, Interior ---------------------------------------------------- 4-26
Location of DADF Models
(MF4580dn/D550) ----------------------------------------------------------------4-26
Front Side ------------------------------------------------------------------------------------4-26
Rear Side ------------------------------------------------------------------------------------4-27
Location of SADF Models
(MF4570dn/MF4550d/MF4553d/MF4554d/MF4450/MF4452/MF4453/
MF4430) -----------------------------------------------------------------------------4-27
Front Side ------------------------------------------------------------------------------------4-27
Rear Side ------------------------------------------------------------------------------------4-28
Location of Copyboard Models
(MF4420n/MF4410/MF4412/D520) ------------------------------------------4-29
Front Side ------------------------------------------------------------------------------------4-29
Rear Side ------------------------------------------------------------------------------------4-30
Removing the Left Cover
Duplex models (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
D550/D520) ------------------------------------------------------------------------4-31
Removing the Left Cover
Single-sided models (MF4450/MF4452/MF4453/MF4430/MF4420n/
MF4410/MF4412) -----------------------------------------------------------------4-32
Removing the Right Cover
Duplex models (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
D550/D520) ------------------------------------------------------------------------4-33
Removing the Right Cover
Single-sided models (MF4450/MF4452/MF4453/MF4430/MF4420n/
MF4410/MF4412) -----------------------------------------------------------------4-34
Before Removing the Front Cover Unit --------------------------------------4-35
Removing the Front Cover Unit -----------------------------------------------4-35
Before Removing the Upper Cover -------------------------------------------4-35
Removing the Upper Cover ----------------------------------------------------4-35
Before Removing the Rear Cover

Single-sided models (MF4450/MF4452/MF4453/MF4430/MF4420n/
MF4410/MF4412) -----------------------------------------------------------------4-37
Removing the Rear Cover
Single-sided models (MF4450/MF4452/MF4453/MF4430/MF4420n/
MF4410/MF4412) -----------------------------------------------------------------4-37
Document Exposure/Feeder System ---------------------------------- 4-39
Location of DADF Unit and Reader Unit
(MF4580dn/D550) ----------------------------------------------------------------4-39
Location of SADF Unit and Reader Unit
(MF4570dn/MF4550d/MF4553d/MF4554d/MF4450/MF4452/MF4453/
MF4430) -----------------------------------------------------------------------------4-39
Location of Copyboard Cover and Reader Unit
(MF4420n/MF4410/MF4412/D520) ------------------------------------------4-40
Before Removing the DADF Unit and Reader Unit-----------------------4-40
Removing the DADF Unit and Reader Unit --------------------------------4-40
Before Removing the DADF Unit ---------------------------------------------4-42
Removing the DADF Unit -------------------------------------------------------4-42
Before Removing the DADF Pickup Unit -----------------------------------4-44
Removing the DADF Pickup Unit ---------------------------------------------4-44
Before Removing the DADF Motor Unit -------------------------------------4-48
Removing the DADF Motor Unit ----------------------------------------------4-48
Before Removing the DADF Solenoid Unit ---------------------------------4-49
Removing the DADF Solenoid Unit ------------------------------------------4-49
Removing the DADF Pickup Roller Unit ------------------------------------4-50
Removing the DADF Separation Pad ----------------------------------------4-52
Before Removing the SADF Unit and Reader Unit -----------------------4-53
Removing the SADF Unit and Reader Unit --------------------------------4-53
Before Removing the SADF Unit ---------------------------------------------4-55
Removing the SADF Unit -------------------------------------------------------4-55
Before Removing the SADF Pickup Unit ------------------------------------4-57
Removing the SADF Pickup Unit ---------------------------------------------4-57
Before Removing the SADF Motor -------------------------------------------4-59
Removing the SADF Motor -----------------------------------------------------4-59
Removing the SADF Pickup Roller -------------------------------------------4-60
Removing the SADF Separation Pad ----------------------------------------4-63
Removing the Copyboard Cover ----------------------------------------------4-64
Before Removing the Copyboard Cover and Reader Unit -------------4-64
Removing the Copyboard Cover and Reader Unit -----------------------4-64
Before Removing the Copyboard Glass
Models with copyboard ----------------------------------------------------------4-66
Removing the Copyboard Glass
Models with copyboard ----------------------------------------------------------4-66
Before Removing the Copyboard Glass
Models with DADF/Models with SADF --------------------------------------4-68
Removing the Copyboard Glass
Models with DADF/Models with SADF --------------------------------------4-68
Before Removing the Flatbed Motor Unit -----------------------------------4-70
Removing the Flatbed Motor Unit ---------------------------------------------4-70
Before Removing the CIS Unit
Models with copyboard ----------------------------------------------------------4-72
Removing the CIS Unit
Models with copyboard ----------------------------------------------------------4-72
Before Removing the CIS unit
Models with DADF/Models with SADF --------------------------------------4-74
Removing the CIS Unit
Models with DADF/Models with SADF --------------------------------------4-74
Controller System ----------------------------------------------------------- 4-76
Location of Duplex Models
(MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/D550/D520) 4-76
Location of Single-sided Models
(MF4450/MF4452/MF4453/MF4430/MF4420n/MF4410/MF4412) ---4-77
Removing the Control Panel Unit
Models with FAX (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
MF4450/MF4452/MF4453) -----------------------------------------------------4-79
Removing the Control Panel Unit
Models without FAX (MF4430/MF4420n/MF4410/MF4412/D550/D520) -
4-79
Before Removing the Drive Belt
Single-sided models (MF4450/MF4452/MF4453/MF4430/MF4420n/
MF4410/MF4412) -----------------------------------------------------------------4-80
Removing the Drive Belt
Single-sided models (MF4450/MF4452/MF4453/MF4430/MF4420n/

MF4410/MF4412) -----------------------------------------------------------------4-80
Before Removing the Drive Belt
Duplex models (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
D550/D520) ------------------------------------------------------------------------4-82
Removing the Drive Belt
Duplex models (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
D550/D520) ------------------------------------------------------------------------4-82
Before Removing the Main Motor
Single-sided models (MF4450/MF4452/MF4453/MF4430/MF4420n/
MF4410/MF4412) -----------------------------------------------------------------4-85
Removing the Main Motor
Single-sided models (MF4450/MF4452/MF4453/MF4430/MF4420n/
MF4410/MF4412) -----------------------------------------------------------------4-85
Before Removing the Main Motor
Duplex models (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
D550/D520) ------------------------------------------------------------------------4-88
Removing the Main Motor
Duplex models (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
D550/D520) ------------------------------------------------------------------------4-88
Before Removing the Main Fan
Duplex models (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
D550/D520) ------------------------------------------------------------------------4-91
Removing the Main Fan
Duplex models (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
D550/D520) ------------------------------------------------------------------------4-91
Before Removing the Engine Controller PCB
Models with FAX (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
MF4450/MF4452/MF4453) -----------------------------------------------------4-93
Removing the Engine Controller PCB
Models with FAX (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
MF4450/MF4452/MF4453) -----------------------------------------------------4-93
Before Removing the Engine Controller PCB
Models without FAX (MF4430/MF4420n/MF4410/MF4412/D550/D520) -
4-96
Removing the Engine Controller PCB
Models without FAX (MF4430/MF4420n/MF4410/MF4412/D550/D520) -
4-96
Before Removing the Main Controller PCB
Models with FAX (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
MF4450/MF4452/MF4453) -----------------------------------------------------4-99
Removing the Main Controller PCB
Models with FAX (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
MF4450/MF4452/MF4453) -----------------------------------------------------4-99
Before Removing the Main Controller PCB
Models without FAX or NET (MF4430/MF4410/MF4412/D550/D520) ----
4-100
Removing the Main Controller PCB
Models without FAX or NET (MF4430/MF4410/MF4412/D550/D520) ----
4-100
Before Removing the Main Controller PCB
Model without FAX, with NET (MF4420n) -------------------------------- 4-102
Removing the Main Controller PCB
Model without FAX, with NET (MF4420n) -------------------------------- 4-102
Before Removing the FAX-NCU PCB
Models with FAX (100V) ------------------------------------------------------ 4-102
Removing the FAX-NCU PCB
Models with FAX (100V) ------------------------------------------------------ 4-102
Before Removing the FAX-NCU PCB
Models with FAX (120V/230V) ----------------------------------------------- 4-103
Removing the FAX-NCU PCB
Models with FAX (120V/230V) ----------------------------------------------- 4-103
Before Removing the Pseudo CI PCB
Models with FAX (100V) ------------------------------------------------------ 4-103
Removing the Pseudo CI PCB
Models with FAX (100V) ------------------------------------------------------ 4-103
Before Removing the Paper Leading Edge Sensor -------------------- 4-104
Removing the Paper Leading Edge Sensor------------------------------ 4-104
Before Removing the Fixing Delivery/Paper Width Sensor PCB --- 4-107
Removing the Fixing Delivery/Paper Width Sensor PCB ------------- 4-107
Before Removing the Toner Sensor and Multi Pickup Sensor Unit
Models with FAX (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
MF4450/MF4452/MF4453) --------------------------------------------------- 4-110

Removing the Toner Sensor and Multi Pickup Sensor Unit
Models with FAX (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
MF4450/MF4452/MF4453) --------------------------------------------------- 4-110
Before Removing the Multi Pickup Sensor Unit
Models without FAX (MF4430/MF4420n/MF4410/MF4412/D550/D520) -
4-112
Removing the Multi Pickup Sensor Unit
Models without FAX (MF4430/MF4420n/MF4410/MF4412/D550/D520) -
4-112
Before Removing the Speaker
Models with FAX (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
MF4450/MF4452/MF4453) --------------------------------------------------- 4-113
Removing the Speaker
Models with FAX (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
MF4450/MF4452/MF4453) --------------------------------------------------- 4-113
Laser Exposure System --------------------------------------------------4-115
Location --------------------------------------------------------------------------- 4-115
Before Removing the Laser Scanner Unit
Duplex models (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
D550/D520) ---------------------------------------------------------------------- 4-115
Removing the Laser Scanner Unit
Duplex models (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
D550/D520) ---------------------------------------------------------------------- 4-115
Before Removing the Laser Scanner Unit
Single-sided models (MF4450/MF4452/MF4453/MF4430/MF4420n/
MF4410/MF4412) --------------------------------------------------------------- 4-117
Removing the Laser Scanner Unit
Single-sided models (MF4450/MF4452/MF4453/MF4430/MF4420n/
MF4410/MF4412) --------------------------------------------------------------- 4-117
Image Formation System ------------------------------------------------4-119
Location --------------------------------------------------------------------------- 4-119
Removing the Transfer Roller ------------------------------------------------ 4-119
Fixing System -------------------------------------------------------------- 4-121
Location --------------------------------------------------------------------------- 4-121
Before Removing the Fixing Assembly
Duplex models (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
D550/D520) ---------------------------------------------------------------------- 4-121
Removing the Fixing Assembly
Duplex models (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
D550/D520) ---------------------------------------------------------------------- 4-121
Before Removing the Fixing Assembly
Single-sided models (MF4450/MF4452/MF4453/MF4430/MF4420n/
MF4410/MF4412) --------------------------------------------------------------- 4-125
Removing the Fixing Assembly
Single-sided models (MF4450/MF4452/MF4453/MF4430/MF4420n/
MF4410/MF4412) --------------------------------------------------------------- 4-125
Pickup And Feeding System ------------------------------------------- 4-133
Location of Duplex models (MF4580dn/MF4570dn/MF4550d/MF4553d/
MF4554d/D550/D520) --------------------------------------------------------- 4-133
Location of Single-sided models
(MF4450/MF4452/MF4453/MF4430/MF4420n/MF4410/MF4412) - 4-133
Before Removing the Pickup Unit
Duplex models (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
D550/D520) ---------------------------------------------------------------------- 4-134
Removing the Pickup Unit
Duplex models (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
D550/D520) ---------------------------------------------------------------------- 4-134
Before Removing the Pickup Unit
Single-sided models (MF4450/MF4452/MF4453/MF4430/MF4420n/
MF4410/MF4412) --------------------------------------------------------------- 4-138
Removing the Pickup Unit
Single-sided models (MF4450/MF4452/MF4453/MF4430/MF4420n/
MF4410/MF4412) --------------------------------------------------------------- 4-138
Before Removing the Pickup Tray Unit
Duplex models (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
D550/D520) ---------------------------------------------------------------------- 4-143
Removing the Pickup Tray Unit
Duplex models (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
D550/D520) ---------------------------------------------------------------------- 4-143
Before Removing the Pickup Tray Unit
Single-sided models (MF4450/MF4452/MF4453/MF4430/MF4420n/
MF4410/MF4412) --------------------------------------------------------------- 4-145

Removing the Pickup Tray Unit
Single-sided models (MF4450/MF4452/MF4453/MF4430/MF4420n/
MF4410/MF4412) --------------------------------------------------------------- 4-145
Removing the Pickup Roller -------------------------------------------------- 4-147
Before Removing the Pickup Solenoid
Duplex models (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
D550/D520) ---------------------------------------------------------------------- 4-148
Removing the Pickup Solenoid
Duplex models (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
D550/D520) ---------------------------------------------------------------------- 4-148
Before Removing the Pickup Solenoid
Single-sided models(MF4450/MF4452/MF4453/MF4430/MF4420n/
MF4410/MF4412) --------------------------------------------------------------- 4-151
Removing the Pickup Solenoid
Single-sided models (MF4450/MF4452/MF4453/MF4430/MF4420n/
MF4410/MF4412) --------------------------------------------------------------- 4-151
Removing the Separation Pad ----------------------------------------------- 4-154
Before Removing the Duplex Feed Unit
Duplex models (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
D550/D520) ---------------------------------------------------------------------- 4-155
Removing the Duplex Feed Unit
Duplex models (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
D550/D520) ---------------------------------------------------------------------- 4-155
Before Removing the Duplex Reverse Solenoid
Duplex models (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
D550/D520) ---------------------------------------------------------------------- 4-156
Removing the Duplex Reverse Solenoid
Duplex models (MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/
D550/D520) ---------------------------------------------------------------------- 4-156
5 Adjustment
Mechanical Adjustment ------------------------------------------------------5-2
Conrming Nip Width ------------------------------------------------------------- 5-2
6 Trouble Shooting
Test Print ------------------------------------------------------------------------6-2
Test Print Function ----------------------------------------------------------------- 6-2
Trouble Shooting Items ------------------------------------------------------6-3
Image Faults ------------------------------------------------------------------------ 6-3
Smudged/Streaked ------------------------------------------------------------------------- 6-3
Version Upgrade --------------------------------------------------------------6-4
Overview ----------------------------------------------------------------------------- 6-4
Preparation -------------------------------------------------------------------------- 6-4
System Requirements --------------------------------------------------------------------- 6-4
Preparation ----------------------------------------------------------------------------------- 6-5
Downloading System Software ------------------------------------------------- 6-5
7 Error Codes
Overview ------------------------------------------------------------------------7-2
Error Codes ---------------------------------------------------------------------7-3
8 Service Mode
Overview ------------------------------------------------------------------------8-2
Entering Service Mode. ---------------------------------------------------------- 8-2
Service Mode Menu --------------------------------------------------------------- 8-2
Screen ow of Service mode ------------------------------------------------------------ 8-2
COPIER -------------------------------------------------------------------------8-3
DISPLAY ----------------------------------------------------------------------------- 8-3
VERSION ------------------------------------------------------------------------------------- 8-3
CCD -------------------------------------------------------------------------------------------- 8-3
I/O -------------------------------------------------------------------------------------- 8-3
R-CON ----------------------------------------------------------------------------------------- 8-3
ADJUST ------------------------------------------------------------------------------ 8-4
ADJ-XY ---------------------------------------------------------------------------------------- 8-4
CCD -------------------------------------------------------------------------------------------- 8-4
FUNCTION -------------------------------------------------------------------------- 8-5
CLEAR ---------------------------------------------------------------------------------------- 8-5
MISC-R ---------------------------------------------------------------------------------------- 8-5
MISC-P ---------------------------------------------------------------------------------------- 8-5
SYSTEM -------------------------------------------------------------------------------------- 8-5
PARAM ---------------------------------------------------------------------------------------- 8-5
SPLMAN -------------------------------------------------------------------------------------- 8-6
OPTION ------------------------------------------------------------------------------ 8-6

BODY ------------------------------------------------------------------------------------------ 8-6
COUNTER --------------------------------------------------------------------------- 8-7
TOTAL ----------------------------------------------------------------------------------------- 8-7
PICK-UP -------------------------------------------------------------------------------------- 8-7
FEEDER -------------------------------------------------------------------------------------- 8-7
JAM -------------------------------------------------------------------------------------------- 8-7
FEEDER -------------------------------------------------------------------------8-8
ADJUST ------------------------------------------------------------------------------ 8-8
FUNCTION -------------------------------------------------------------------------- 8-8
FAX -------------------------------------------------------------------------------8-9
List of SSSW ------------------------------------------------------------------------ 8-9
List of Menu ------------------------------------------------------------------------8-10
List of NUM ------------------------------------------------------------------------- 8-11
List of NCU ------------------------------------------------------------------------- 8-11
TONE/PULSE ------------------------------------------------------------------------------ 8-11
TONE/PULSE ------------------------------------------------------------------------------ 8-11
2nd DIAL TONE ----------------------------------------------------------------------------8-12
BUSY TONE0 -------------------------------------------------------------------------------8-12
BUSY TONE1 -------------------------------------------------------------------------------8-12
REORDER TONE -------------------------------------------------------------------------8-13
AUTO RX ------------------------------------------------------------------------------------8-13
CNG DETECT ------------------------------------------------------------------------------8-13
RKEY -----------------------------------------------------------------------------------------8-13
PBX DIAL TONE ---------------------------------------------------------------------------8-14
PBX BUSY TONE -------------------------------------------------------------------------8-14
TESTMODE ------------------------------------------------------------------ 8-15
SYSTEM ----------------------------------------------------------------------------8-15
DRAM -----------------------------------------------------------------------------------------8-15
SPEAKER -----------------------------------------------------------------------------------8-15
SCAN --------------------------------------------------------------------------------8-15
ADJUST --------------------------------------------------------------------------------------8-15
SENSOR -------------------------------------------------------------------------------------8-15
ADFTEST ------------------------------------------------------------------------------------8-16
BOOKFEED ---------------------------------------------------------------------------------8-16
FAX -----------------------------------------------------------------------------------8-16
MODEM --------------------------------------------------------------------------------------8-16
FACULTY ------------------------------------------------------------------------------------8-17
PANEL ----------------------------------------------------------------------------------------8-17
NETWORK -------------------------------------------------------------------------8-17
SSSW -----------------------------------------------------------------------------------------8-17
9 Appendix
Service Tools -------------------------------------------------------------------9-2
Solvent/Oil List -----------------------------------------------------------------9-3
General Circuit Diagram -----------------------------------------------------9-4
General Timing Chart --------------------------------------------------------9-5

■CDRH Provisions
■Laser Safety
■Toner Safety
■Notes on Handling
Lithium Battery
■Notes on Assembly/
Disassembly
Safety Precautions
MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/MF4450/MF4452/
MF4453/MF4430/MF4420n/MF4550d/MF4410/MF4412/D550/D520
Series
F-0-1

0-2
0-2
CDRH Provisions
Food and Drug CDRH (Center for Devices and Radiological Health) under FDA (Food and
Drug Administration) enforced provisions of the section for laser and laser products on August
2, 1976. These provisions are applicable to all laser products manufactured or assembled
after August 1, 1976 and allow only products certied their compliance with the provisions
to market in the US. Each product shall have afxed the applicable label as shown below to
follow the labeling requirements prescribed in CDRH provisions.
Note that the wording included in labels is different depending on laser product
classications.
F-0-2
Laser Safety
About Laser Beams
Laser radiation may be hazardous to human. The laser scanner unit mounted in this device is
sealed in the protective housing and the external cover to prevent laser beams from leaking
to the environment. As long as the device is operated under normal conditions, users are
safely guarded from laser leaks.
Handling Laser Scanner Unit
Before providing service works for the laser scanner unit and its peripherals, ensure to turn
off the power of the device.
Any cover with potential dangers of laser beam reection has afxed the caution label at the
position shown in the gure below.
F-0-3

0-3
0-3
Toner Safety
About Toner
Toner is a nontoxic matter composed of plastic, iron and a trace of pigments.
Never throw toner in ames to avoid explosion.
Handling Adhered Toner
• Use dry tissue paper to wipe off toner adhered to skin or clothes and wash in water.
• Never use warm water for cleaning up toner to prevent toner particles from being able to
soak into bers permanently.
• Toner particles are reactive with vinyl polymers. Avoid contacting these materials.
Notes on Handling Lithium Battery
Replacing with wrong battery types may cause explosion.
Follow instructions to dispose used batteries properly.
Notes on Assembly/Disassembly
Follow the items below to assemble/disassemble the device.
1. Disconnect the power plug to avoid any potential dangers during assembling/disassembling
works.
2. If not specially instructed, reverse the order of disassembly to reinstall.
3. Ensure to use the right screw type (length, diameter, etc.) at the right position when
assembling.
4. To keep electric conduction, binding screws with washers are used to attach the grounding
wire and the varistor. Ensure to use the right screw type when assembling.
5. Unless it is specially needed, do not operate the device with some parts removed.
6. Never remove the paint-locked screws when disassembling.

1
1Product Overview
Product Overview
■Product Lineups
■Features
■Product Specications
■Name of Parts

1
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1-2
Product Overview > Product Lineups > Main Unit
Product Overview > Product Lineups > Main Unit
Product Lineups
Main Unit
Model MF4580dn MF4570dn
Cong 4in1 DADF+N 4in1 SADF+N
Design
ADF
DADF Yes -
SADF - Yes
PLATEN - -
Engine 2-Sided Yes Yes
1-Sided - -
LAN port Yes Yes
FAX Yes Yes
T-1-1
Model MF4550d/MF4553d/MF4554d
Cong 4in1 SADF
Design
ADF
DADF -
SADF Yes
PLATEN -
Engine 2-Sided Yes
1-Sided -
LAN port -
FAX Yes
Model D550 D520
Cong 3in1 DADF 3in1 Pla
Design
ADF
DADF Yes -
SADF - -
PLATEN - Yes
Engine 2-Sided Yes Yes
1-Sided - -
LAN port - -
FAX - -
T-1-2
T-1-3

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1-3
Product Overview > Product Lineups > Options
Product Overview > Product Lineups > Options
Model MF4450/MF4452/MF4453 MF4430
Cong 4in1 SADF 3in1 SADF
Design
ADF
DADF - -
SADF Yes Yes
PLATEN - -
Engine 2-Sided - -
1-Sided Yes Yes
LAN port - -
FAX Yes -
Model MF4420n MF4410/MF4412
Cong 3in1 Pla+N 3in1 Pla
Design
ADF
DADF - -
SADF - -
PLATEN Yes Yes
Engine 2-Sided - -
1-Sided Yes Yes
LAN port Yes -
FAX - -
T-1-4
T-1-5
Options
• Hand Set Only FAX Model

1
1
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1-4
Product Overview > Product Specications > Main Unit Specications
Product Overview > Product Specications > Main Unit Specications
Features
Features
1. Small-size, high-speed monochrome printer
This equipment has a compact body that realizes high-speed print of 25 ppm.
2. Automatic duplex print
Automatic two-sided printing is available with standard equipped duplex unit.
3. Reduction in standby time and energy consumption
This equipment employs on-demand xing where the heater activates only during printing,
resulting in a reduction in standby time and energy consumption on this mode.
4. Realization of noise reduction and stable image quality
This equipment employs a belt drive method for transmitting the drive of the main motor.
This enables lower noise and more stable image quality compared to the conventional gear
drive method. (See NOTE)
5. Improved Usability
In this equipment maintenance (jam removal, replacing the cartridge) can be performed by
accessing one point of the delivery tray.
Note:
Changing the drive method from gear to belt reduces uneven pitch due to varied
rotation speed of the photosensitive drum, which realizes stable image quality.
Product Specications
Main Unit Specications
Copyboard Fixed
Device Installation Desktop
Light source LED (RGB)
Image scanning CIS (color)
Photoreceptor OPC drum (φ24)
Light exposure method Laser beam exposure (semiconductor laser)
Charging method Roller charging
Developing method Toner projection developing method
Transfer method Direct transfer to transfer member
Separation method Curvature separation
Paper feed method Pickup Tray : Semilunar-shaped Pickup Roller + Pad separation
method (pressure release mechanism is not available)
Multi-purpose Tray : Semilunar-shaped Pickup Roller + Pad
separation method (pressure release mechanism is not available)
Paper delivery method Face-down
Drum cleaning method Cleaning blade
Fixing method On-demand method with Ceramic Heater
Toner supply method All-in-one cartridge with drum
Toner level sensor Yes (magnetic sensor method) FAX models only
Document types Sheets, Book, Height of document : 20 mm, Weight: up to 2 Kg
Maximum document size Fixation : to A4
ADF : to LGL
Image size magnication 100 % magnication
A conguration, reduction : A4 -> B5, B5 -> A5, A4 -> A5
A conguration, enlargement : A5 -> A4, A5 -> B5, B5 -> A4
Inch conguration, reduction : LGL -> LRT
Zoom : 25 to 400 % (1 % increment)
Reading resolution Text/photo : 300 dpi x 300 dpi (default)
Text/photo : 600 dpi x 600 dpi
Text : 600 dpi x 600 dpi
Photo : 600 dpi x 600 dpi
Print resolution 600 dpi x 600 dpi
Warm-up Time MF4580dn/MF4470dn/MF4550d/MF4553d/MF4454d/MF4450/
MF4452/MF4453/MF4420n
12seconds or less
MF4430/MF4410/MF4412/D550/D520
10 seconds or less
(Temperature: 20 deg C humidity: 65% RH; from when the machine
is turned on with the main power switch to when the standby display
appears)
First print time 5.8 seconds or less (LTR)/6 seconds or less (A4)

1
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1-5
Product Overview > Product Specications > Main Unit Specications
Product Overview > Product Specications > Main Unit Specications
Print Speed MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/D550/D520
26 ppm (LTR)/25 ppm (A4)
MF4450/MF4452/MF4453/MF4430/MF4420n/MF4410/MF4412
24 ppm (LTR)/23 ppm (A4)
Copy speed MF4580dn/MF4570dn/MF4550d/MF4553d/MF4554d/D550/D520
26 ppm (LTR)/25 ppm (A4)
MF4450/MF4452/MF4453/MF4430/MF4420n/MF4410/MF4412
24 ppm (LTR)/23 ppm (A4)
Available paper size in Pickup
Tray
Fixed size :
A4, B5, A5, LGL, LTR, Statement, Executive, Ofcio, B-ofcio,
M-ofcio, Government-Letter, Government-Legal, Foolscap,
A-foolscap, Envelope COM10, Envelope C5, Envelope B5,
Envelope DL
Custom paper size :
Width : 76.2 to 216 mm, Length : 210 to 356 mm
Available paper size in multi-
purpose tray
Fixed size :
A4, B5, A5, LGL, LTR, Statement, Executive, Ofcio, B-ofcio,
M-ofcio, Government-Letter, Government-Legal, Foolscap,
A-foolscap, Envelope COM10, Envelope Monarch, Envelope C5,
Envelope B5, Envelope DL, Index Card
Custom paper size :
Width : 76.2 to 216 mm, Length : 210 to 356 mm
Paper types for Pickup Tray Plain paper (60 to 90 g/m2), Heavy paper (91 to 163 g/m2),
Transparency, Labels, Envelope, Postcard
Multi-Purpose Tray Plain paper (60 to 90 g/m2), Heavy paper (91 to 163 g/m2),
Transparency, Labels, Envelope, Postcard
Stack capacity of Pickup Tray About 250 sheets (Nomal paper : 60 to 80 g/m2)
Stack capacity of Multi-purpose
Tray
1 sheet
Delivery tray stacking capacity About 100 sheets (Nomal paper : 60 to 80 g/m2)
Allowable environmental
temperature
10 - 30 deg C
Allowable humidity 20 - 80 %
Duplex method Yes
Interface Standard : Hi-Speed USB/USB, Option :none
Hard Disk Standard : none, Option : none
Memory Standard : 4MB, Option : none
Power rating AC100 V(±10 %) 50/60 Hz (±2 Hz)
AC120-127 V, +/-10 % (50, 60 Hz +/-2 Hz)
AC220-240 V, +/-10 % (50, 60 Hz +/-2 Hz)
Maximum power consumption 100 V model : 890 W
120 V model : 1090W
230 V model : 1220 W
Power consumption 100 V model : 480 W
120 V model : 470 W
230 V model : 500 W
Ozone emission Initial : average 0.01 ppm or less
After use : average 0.035 ppm
Dimensions (W x D x H) MF4580dn/D550
390 x 429 x 361 mm
MF4570dn/MF4550d/MF4553d/MF4454d/MF4452/MF4453/
MF4450/MF4430
390 x 421 x 370 mm
MF4420n/MF4410/MF4412/D520
390 x 414 x 301 mm
Weight MF4580dn : Approx 13.4 kg
MF4570dn : Approx 12.3 kg
MF4550d/MF4453d/MF4454d : Approx 11.8 kg
MF4450/MF4452/MF4453 : Approx 11.7 kg
MF4430 : Approx 11.5 kg
MF4420n : Approx 10.4 kg
MF4410/MF4412 : Approx 10.3 kg
D550 : Approx 13.0 kg
D520 : Approx 10.5 kg(including toner cartridges)
T-1-6

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1-6
Product Overview > Product Specications > FAX Specications
Product Overview > Product Specications > FAX Specications
SADF/DADF Specications
Document setting direction face-up method
Document setting position Center reference
Document type Sheet document
Document size Size : A4R/B5R/A5/B6 (landscape)/LGL/LTRR
2-sided : A4R/B5R/A5/LTRR/LGL/B6 (landscape only)
Feed direction : 127 mm to 356 mm
Width direction : 148 mm to 216 mm
Document processing mode SADF : 1-sided document -> 1-sided copy, 1-sided document ->
2-sided copy
DADF : 1-sided document -> 1-sided copy, 1-sided document
-> 2-sided copy, 2-sided document -> 1-sided copy, 2-sided
document -> 2-sided copy
Document weight Continuous feed 1-sided : 50 to 105 g/m2
Continuous reading 2-sided : 60 to 105 g/m2
Document reading method Stream reading
Document stack capacity DADF Ssize : 50 Sheets/Lsize : 10 Sheets
SADF Ssize : 35 Sheets/Lsize : 10 Sheets
Mixed paper reading None
Document AE sensor None
Document size sensor None
Stamp function None
Document feed speed
(at reading)
100 % 129.3 mm/s DADF
112.75 mm/s SADF
Document processing speed
(At A4, LTR)
1-sided constant speed, 22 ipm (sheets/min), DADF
20 ipm (sheets/min), SADF
T-1-7
FAX Specications
Communication Protocol Super G3
Modem speed 33.6 kbps
Data compression method MH, MR, MMR
Dial method One-touch dial : 4
Abbreviation dial : 100
Group dial : 50
Address book dial
Normal dial : entry by numeric keypad
Auto redial
Manual redial
Concurrent transmission : 114
Reception method Auto reception
Remote reception by a telephone
Report output TX Report
Communication Management Report
(to be output automatically for every 40 communications)
RX Report
T-1-8