Canon Duplex Unit-A1 User manual

Sep 14 2005
Service Manual
Duplex unit
Duplex Unit-A1

Application
This manual has been issued by Canon Inc. for qualified 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 written consent of Canon Inc.
COPYRIGHT © 2001 CANON INC.
Printed in Japan
Caution
Use of this manual should be strictly supervised to avoid disclosure of confidential information.

Introduction
Symbols Used
This documentation uses the following symbols to indicate special information:
Symbol Description
Indicates an item of a non-specific nature, possibly classified as Note, Caution, or Warning.
Indicates an item requiring care to avoid electric shocks.
Indicates an item requiring care to avoid combustion (fire).
Indicates an item prohibiting disassembly to avoid electric shocks or problems.
Indicates an item requiring disconnection of the power plug from the electric outlet.
Indicates an item intended to provide notes assisting the understanding of the topic in question.
Indicates an item of reference assisting the understanding of the topic in question.
Provides a description of a service mode.
Provides a description of the nature of an error indication.
Memo
REF.

Introduction
The following rules apply throughout this Service Manual:
1. Each chapter contains sections explaining the purpose of specific functions and the relationship between electrical and mechanical systems with refer-
ence 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 flipping 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, how-
ever, 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 field. 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 com-
municated 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
Contents
Chapter 1 Specifications
1.1 Product Specifications ................................................................................................................................... 1- 1
1.1.1 Specifications ........................................................................................................................................... 1- 1
1.2 Names of Parts ............................................................................................................................................... 1- 1
1.2.1 External View............................................................................................................................................ 1- 1
1.2.2 Sectional View.......................................................................................................................................... 1- 2
Chapter 2 Functions
2.1 Basic Construction.......................................................................................................................................... 2- 1
2.1.1 Outline ....................................................................................................................................................... 2- 1
2.2 Pick-Up/Feed Systm....................................................................................................................................... 2- 1
2.2.1 Outline ....................................................................................................................................................... 2- 1
2.2.2 Paper Feed Path...................................................................................................................................... 2- 3
2.2.3 Paper Feed Operation ............................................................................................................................ 2- 3
2.3 Detecting Jams ............................................................................................................................................. 2- 10
2.3.1 Outline ..................................................................................................................................................... 2- 10
2.3.2 Delay Jam ............................................................................................................................................... 2- 10
2.3.3 Stationary Jam ....................................................................................................................................... 2- 10
Chapter 3 Parts Replacement Procedure
3.1 Removing from the Host Machine................................................................................................................ 3- 1
3.1.1 Duplex Unit................................................................................................................................................ 3- 1
3.1.1.1 Removing the Drum Unit ................................................................................................................. 3- 1
3.1.1.2 Removing the Rear Cover............................................................................................................... 3- 1
3.1.1.3 Removing the Left Cover (Rear) .................................................................................................... 3- 1
3.1.1.4 Removing the Duplex Unit............................................................................................................... 3- 1
3.2 Drive System ................................................................................................................................................... 3- 2
3.2.1 Reversal Motor ......................................................................................................................................... 3- 2
3.2.1.1 Removing the Reversal Motor ........................................................................................................ 3- 2
3.2.2 Feed Motor ................................................................................................................................................ 3- 2
3.2.2.1 Removing the Feed Motor............................................................................................................... 3- 2
3.3 Electrical System ............................................................................................................................................ 3- 2
3.3.1 Duplex Paper Sensor............................................................................................................................... 3- 2
3.3.1.1 Removing the Duplex Paper Sensor ............................................................................................. 3- 2
3.3.2 Duplex Flapper Solenoid......................................................................................................................... 3- 2
3.3.2.1 Removing the Duplex Flapper Solenoid ....................................................................................... 3- 2
3.3.3 Duplex Controller PCB ............................................................................................................................ 3- 3
3.3.3.1 Removing the Duplex Controller PCB ........................................................................................... 3- 3
Chapter 4 Maintenance

Contents
4.1 Maintenance and Inspection .........................................................................................................................4- 1
4.1.1 Periodically Replaced Parts ....................................................................................................................4- 1
4.1.1.1 Periodically Replaced Parts ............................................................................................................4- 1
4.1.2 Durables.....................................................................................................................................................4- 1
4.1.2.1 Durables .............................................................................................................................................4- 1
4.1.3 Periodical Servicing..................................................................................................................................4- 1
4.1.3.1 Periodical Servicing Items ...............................................................................................................4- 1
4.2 Outline of Electrical Components .................................................................................................................4- 1
4.2.1 Outline of Electrical Components ..........................................................................................................4- 1
Chapter 5 Error Code
5.1 Service Error Code .........................................................................................................................................5- 1
5.1.1 Error Code list...........................................................................................................................................5- 1
5.2 Jam Codes .......................................................................................................................................................5- 1
5.2.1 Jam Code List...........................................................................................................................................5- 1

Chapter 1 Specifications

Contents
Contents
1.1 Product Specifications........................................................................................................................................ 1-1
1.1.1 Specifications .............................................................................................................................................. 1-1
1.2 Names of Parts.................................................................................................................................................... 1-1
1.2.1 External View.............................................................................................................................................. 1-1
1.2.2 Sectional View ............................................................................................................................................ 1-2

Chapter 1
1-1
1.1 Product Specifications
1.1.1 Specifications
0010-4339
T-1-1
1.2 Names of Parts
1.2.1 External View
0010-4340
F-1-1
T-1-2
Item Description Remarks
Type Built in the host machine
Paper supply method Switchback reversing method
Copy paper type 60g/m2 to 90g/m2
Copy paper size A3, B4, A4, A4R, B5, B5R, A5R, 11X17, LGL, LTR,
LTR-R, STMTR
Power supply DC power supply from host machine
Weight 2.5 kg
Dimensions 437.2 mm x 448 mm x 378.3 mm (W x D x H) Incl. reversal tray dimensions
[1] Duplex unit [4] Blind cover
[2] Reversal tray [5] Reversal guide
[3] Reversal tray (sub)
[1]
[2]
[3]
[4]
[5]

Chapter 1
1-2
1.2.2 Sectional View
0010-4341
F-1-2
T-1-3
[1] Feed roller 1 [5] Delivery guide
[2] Reversal tray (sub) [6] Duplex flapper
[3] Reversal tray [7] Feed roller 2
[4] Reversal flapper [8] Feed roller 3
[1]
[3] [2]
[4]
[6]
[5]
[7]
[8]

Chapter 2 Functions

Contents
Contents
2.1 Basic Construction ............................................................................................................................................. 2-1
2.1.1 Outline ......................................................................................................................................................... 2-1
2.2 Pick-Up/Feed Systm........................................................................................................................................... 2-1
2.2.1 Outline ......................................................................................................................................................... 2-1
2.2.2 Paper Feed Path ........................................................................................................................................... 2-3
2.2.3 Paper Feed Operation .................................................................................................................................. 2-3
2.3 Detecting Jams ................................................................................................................................................. 2-10
2.3.1 Outline ....................................................................................................................................................... 2-10
2.3.2 Delay Jam .................................................................................................................................................. 2-10
2.3.3 Stationary Jam ........................................................................................................................................... 2-10

Chapter 2
2-1
2.1 Basic Construction
2.1.1 Outline
0010-4342
The operation sequence of the duplex unit is controlled by the duplex controller PCB. An 8-bit microcomputer mounted on the duplex controller PCB controls the
operation sequence of the duplex unit and the serial communication with the DC controller PCB.
The duplex controller PCB drives motors in response to various commands sent from the DC controller PCB. The DC controller PCB sends the duplex unit status
back to the printer. The duplex unit is powered by 24 VDC supplied from the power supply kit PCB and +5VDC and +3.3 VDC supplied from the DC controller
PCB.
The duplex unit circuit configuration is shown below.
F-2-1
T-2-1
2.2 Pick-Up/Feed Systm
2.2.1 Outline
0010-4343
After the printing paper is fed by the delivery roller in the fixing unit of the host machine, the duplex flapper solenoid (SL1001) turns on to lead the paper to the
duplex unit.
The printing paper led to the duplex unit is fed by three feed rollers to the printer.
The reversal motor (M102) and feed motor (M1001) are stepping motors. The rotation direction of these motors is controlled by the microcomputer (CPU) mounted
on the duplex controller PCB.
Feed roller 1 is driven by the reversal motor (M1002). Feed rollers 2 and 3 are driven by the feed motor (M1001). The paper transport path is provided with two
photo interrupters, duplex paper sensor 1 (SR1002) and duplex paper sensor 2 (SR1003).
M1001 Feed motor SR1002 Duplex paper sensor 1
M1002 Reversal motor SR1003 Duplex paper sensor 2
SL1001 Duplex flapper solenoid
DC
controller
PCB
J1002
J218
M1001
M
J275
J1005
M1002
M
J276
J1006
SR1002
J273
J1003
SL1001
SR1003
J274
SL
Optional
power
supply
PCB
J1001
J55

Chapter 2
2-2
F-2-2
T-2-2
[1] Feed roller 1 M1001: Feed motor
[2] Feed roller 2 M1002: Reversal motor
[3] Feed roller 3 SR1002: Duplex paper sensor 1
SL1001: Duplex flapper solenoid SR1003: Duplex paper sensor 2
M1002
[2]
[1]
[3]
SR1002
SR1003
M1001
SL1001