Canon imageRUNNER 2545 User manual

987654321
imageRUNNER 2545/2535 Series
Service Manual Rev2
Product Outline
Function
Periodic Servicing
Parts Replacing and Cleaning
Adjustments
Troubleshooting
Error Code
Service Mode
Installation
Appendix

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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.
Copyright CANON INC. 2010
Caution
Use of this manual should be strictly supervised to avoid disclosure of condential
information.

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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

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Contents
0 Safety Precautions
CDRH Act --------------------------------------------------------------------- 0-13
Laser Safety ------------------------------------------------------------------ 0-13
Handling of Laser System ------------------------------------------------ 0-13
Turn power switch ON ----------------------------------------------------- 0-14
Power Supply ---------------------------------------------------------------- 0-14
Safety of Toner --------------------------------------------------------------- 0-15
About Toner ------------------------------------------------------------------------0-15
Toner on Clothing or Skin -------------------------------------------------------0-15
Notes When Handling the Lithium and Ni-MH Batteries ---------- 0-15
Notes Before it Works Serving ------------------------------------------- 0-15
1 Product Overview
Product Lineup -----------------------------------------------------------------1-2
Host machine ----------------------------------------------------------------------- 1-2
Host machine conguration -------------------------------------------------------------- 1-2
Model type ------------------------------------------------------------------------------------ 1-2
Option --------------------------------------------------------------------------------- 1-3
Pickup delivery / image reading options ---------------------------------------------- 1-3
Function expanding option --------------------------------------------------------------- 1-4
Feature --------------------------------------------------------------------------1-5
Product feature --------------------------------------------------------------------- 1-5
Specications ------------------------------------------------------------------1-6
Specications ----------------------------------------------------------------------- 1-6
Weight / Size ------------------------------------------------------------------------ 1-7
Productivity (Print speed) -------------------------------------------------------- 1-7
Paper type --------------------------------------------------------------------------- 1-8
Pickup ----------------------------------------------------------------------------------------- 1-8
Name of Parts ------------------------------------------------------------------1-9
External View ----------------------------------------------------------------------- 1-9
Cross Sectional View ------------------------------------------------------------1-10
Operation --------------------------------------------------------------------------- 1-11
Power Switch -------------------------------------------------------------------------------1-11
Description of Control Panel ------------------------------------------------------------ 1-11
2 Technology
Basic Conguration -----------------------------------------------------------2-2
Functional Conguration --------------------------------------------------------- 2-2
Basic sequence ----------------------------------------------------------------------------- 2-2
Original Exposure System --------------------------------------------------2-3
Construction ------------------------------------------------------------------------- 2-3
Specications/controls/functions -------------------------------------------------------- 2-3
Major Components ------------------------------------------------------------------------- 2-3
Reader Relay PCB ------------------------------------------------------------------------- 2-4
Basic Sequence -------------------------------------------------------------------- 2-5
Basic Sequence at Power-On ----------------------------------------------------------- 2-5
Basic Sequence at Start Key ON (book mode/1 original) ------------------------ 2-5
Basic Sequence at Start Key ON (ADF mode/1 original) ------------------------- 2-5
Controls ------------------------------------------------------------------------------ 2-6
Controlling the Scanner Drive System ------------------------------------------------ 2-6
CCD -------------------------------------------------------------------------------------------- 2-7
Enlargement/Reduction ------------------------------------------------------------------- 2-9
Detecting the Size of Originals ---------------------------------------------------------- 2-9
Dirt Sensor Control ------------------------------------------------------------------------2-12
Image Processing -------------------------------------------------------------------------2-13
Service Operations --------------------------------------------------------------2-15
Action to take when replacing parts ---------------------------------------------------2-15
Consumables -------------------------------------------------------------------------------2-15
Service precautions -----------------------------------------------------------------------2-15
Controller System ----------------------------------------------------------- 2-16
Overview ----------------------------------------------------------------------------2-16
Functional Conguration -----------------------------------------------------------------2-16
Controls -----------------------------------------------------------------------------2-18
Flow of Image Data -----------------------------------------------------------------------2-18
Construction of the Image Processing Module -------------------------------------2-18
Reader Unit Input Image Processing -------------------------------------------------2-19
Compressio/ Extesion/ Editing Block -------------------------------------------------2-19
Printer unit Output Image Processing ------------------------------------------------2-20
Flow of Image Data According to Copy Functions --------------------------------2-20

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Flow of Image Data for the SEND Function ----------------------------------------2-21
Flow of Image Data for the Fax Transmission --------------------------------------2-21
Flow of Image Data for the Fax Reception Function -----------------------------2-22
Flow of Image Data for the PDL Function -------------------------------------------2-22
Software counter ---------------------------------------------------------------------------2-23
Fan --------------------------------------------------------------------------------------------2-23
Power supply -------------------------------------------------------------------------------2-25
Service Operations ---------------------------------------------------------------2-27
Action to take when replacing parts ---------------------------------------------------2-27
Consumables ------------------------------------------------------------------------------2-27
Service precautions -----------------------------------------------------------------------2-27
Laser Exposure System --------------------------------------------------- 2-28
Construction ------------------------------------------------------------------------2-28
Specications/Controls/Functions -----------------------------------------------------2-28
Main Conguration Parts ----------------------------------------------------------------2-28
Control System Conguration ----------------------------------------------------------2-29
Basic Sequence -------------------------------------------------------------------2-30
Basic Sequence ----------------------------------------------------------------------------2-30
Various Controls -------------------------------------------------------------------2-31
Controlling the Laser Activation Timing ----------------------------------------------2-31
Controlling the Intensity of Laser Light -----------------------------------------------2-33
Controlling the Laser Scanner Motor -------------------------------------------------2-33
Controlling the Laser Shutter -----------------------------------------------------------2-33
Image Formation System ------------------------------------------------- 2-34
Basic Conguration ---------------------------------------------------------------2-34
Specications of Image Formation System -----------------------------------------2-34
Major Components of Image Formation System ----------------------------------2-35
Image Formation Process ---------------------------------------------------------------2-36
Basic Sequence -------------------------------------------------------------------2-37
Sequence of Operation (initial rotation) ----------------------------------------------2-37
Sequence of Operation (printing) ------------------------------------------------------2-37
Sequence of Operation (last rotation) ------------------------------------------------2-37
Controls -----------------------------------------------------------------------------2-38
Drum Unit ------------------------------------------------------------------------------------2-38
Developing Unit ----------------------------------------------------------------------------2-39
Toner Container ----------------------------------------------------------------------------2-40
Transfer Unit --------------------------------------------------------------------------------2-41
Waste Toner Box ---------------------------------------------------------------------------2-42
Work of Service -------------------------------------------------------------------2-43
When Replacing the Components ----------------------------------------------------2-43
Periodical Service -------------------------------------------------------------------------2-43
Points to Note about Service -----------------------------------------------------------2-43
Fixing System ---------------------------------------------------------------- 2-44
Overview ----------------------------------------------------------------------------2-44
Features --------------------------------------------------------------------------------------2-44
Specications -------------------------------------------------------------------------------2-44
Major parts conguration ----------------------------------------------------------------2-45
Controls -----------------------------------------------------------------------------2-46
Fixing temperature control: overview -------------------------------------------------2-46
Standby temperature control------------------------------------------------------------2-47
Print temperature control ----------------------------------------------------------------2-47
Down sequence control ------------------------------------------------------------------2-49
User mode related to xing grade -----------------------------------------------------2-51
Fixing pressure roller cleaning sequence -------------------------------------------2-52
Fixing lm edge cooling control --------------------------------------------------------2-52
Paper loop amount control before xing ---------------------------------------------2-53
Protection features ------------------------------------------------------------------------2-54
Pickup Feed System ------------------------------------------------------- 2-55
Overview ----------------------------------------------------------------------------2-55
Specication --------------------------------------------------------------------------------2-55
Parts Conguration ------------------------------------------------------------------------2-55
Diagram of Paper Paths (w/ 2 Way Unit/ inaner 2 way tray) --------------------2-57
Diagram of Paper Paths (w/o 2 Way Unit) ------------------------------------------2-58
Controls -----------------------------------------------------------------------------2-59
Overview -------------------------------------------------------------------------------------2-59
Cassette Pickup Assembly -------------------------------------------------------------2-59
Multi-Purpose Pickup Assembly -------------------------------------------------------2-63
Fixing / Registration Assembly ---------------------------------------------------------2-64
Duplex / Delivery Assembly -------------------------------------------------------------2-64
Detecting Jams -----------------------------------------------------------------------------2-65
Work of Service -------------------------------------------------------------------2-66
Periodical ServicePeriodical Service -------------------------------------------------2-66
Consumables -------------------------------------------------------------------------------2-66
Periodically Servicing ---------------------------------------------------------------------2-66
Embedded RDS ------------------------------------------------------------- 2-67
Product Overview -----------------------------------------------------------------2-67