Canon GP405 User manual

COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
REVISION 0
JAN. 1999 FY8-13FV-000
GP405/335

COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
IMPORTANT
THIS DOCUMENTATION IS PUBLISHED BY CANON INC., JAPAN, TO SERVE AS A SOURCE
OF REFERENCE FOR WORK IN THE FIELD.
SPECIFICATIONS AND OTHER INFORMATION CONTAINED HEREIN MAY VARY SLIGHTLY
FROM ACTUAL MACHINE VALUES OR THOSE FOUND IN ADVERTISING AND OTHER
PRINTED MATTER.
ANYQUESTIONSREGARDINGINFORMATIONCONTAINEDHEREINSHOULD BEDIRECTED
TO THE COPIER SERVICE DEPARTMENT OF THE SALES COMPANY.
THIS DOCUMENTATION IS INTENDED FOR ALL SALES AREAS, AND MAY CONTAIN IN-
FORMATION NOT APPLICABLE TO CERTAIN AREAS.
COPYRIGHT © 1999 CANON INC.
Printed in Japan
Imprimé au Japon
Use of this manual should be strictly su-
pervised to avoid disclosure of confidential
information.
Prepared by
OFFICE IMAGING PRODUCTS TECHNICAL SUPPORT DEPARTMENT 1
OFFICE IMAGING PRODUCTS TECHNICAL SUPPORT DIVISION
CANON INC.
5-1, Hakusan, 7-chome,Toride-City, Ibaraki-Pref., 302-8501, Japan

COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
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The copier is a multi-function copier capable of serving as a copier, fax, and printer.
This Service Manual provides information needed to service the copier in the field. For
information on technologies used in common with the existing copiers, refer to the "Copier
Basic Series" as necessary.
This Service Manual consists of the following chapters:
Chapter 1 General Description introduces the copier's features and
specifications, shows how to operate the copier, and explains how
copies are made.
Chapter 2 Basic Operation provides outlines of the copier's various mechanical
workings.
Chapter 3 Exposure System discusses the principles of operation used for the
copier's lens drive unit and scanner drive unit. It also explains the
timing at which these drive units are operated, and shows how they
may be disassembled/assembled and adjusted.
Chapter 4 Image Formation System discusses the principles of operation used
for the copier's image processing units. It also explains the timing at
which the various units involved in image processing are operated,
and shows how they may be disassembled/assembled and adjusted.
Chapter 5 Laser Exposure System discusses the principles of operation used for
the copier's laser unit. It also explains the timing at which the unit is
operated, and shows how they may be disassembled/assembled and
adjusted.
Chapter 6 Image Formation System discusses the principles of how images are
formed. It also explains the timing at which the various units involved in
image formation are operated, and show how they may be
disassembled/assembled and adjusted.
Chapter 7 Pick-Up/Feeding System explains the principles of picking up and
feeding copy paper in view of the functions of electrical and
mechanical units used to move copy paper and in relation to their
timing of operation. It also shows how these units may be
disassembled/assembled and adjusted.
Chapter 8 Side Paper Deck explains the principles of operation used from when
paper is picked up to when copies are delivered. It also explains the
timing at which various drive units are operated, and shows how they
may be disassembled/assembled and adjusted.
Chapter 9 Fixing System explains the principles used to fuse toner images to
transfer media in view of the functions of electrical and mechanical
units and in relation to their timing of operation. It also shows how
these units may be disassembled/assembled and adjusted.
Chapter 10 Externals/Auxiliary Mechanisms shows the copier's external parts, and
explains the principles used for the copier's various control
mechanisms in view of the functions of electrical and mechanical units
and in relation to their timing of operation. It also shows how these
units may be disassembled/assembled and adjusted.
Chapter 11 Systems explains connections and specifications related to systems
and shows how to disassemble and assemble them.
Chapter 12 Installation introduces requirements for the site of installation, and
shows how the copier may be installed using step-by-step instructions.
INTRODUCTION

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COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Chapter 13 Maintenance and Servicing provides tables of periodically replaced
parts and consumables/durables and scheduled servicing charts.
Chapter 14 Troubleshooting provides tables of maintenance/inspection,
standards/adjustments, and problem identification (image fault/
malfunction).
Appendix contains a general timing chart and general circuit diagrams.
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.
For a full understanding of the copier, this Service Manual should be used side by side
with the separately available "Copier Basic Series." Refer to the descriptions in each of
the following volumes:
Volume 1
Volume 2
Volume 3
Volume 4
Volume 5
Volume 6
Volume 7

COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
iii
System Configuration
The copier may be configured with its accessories as follows:
nPick-Up/Delivery Accessories
[1] DADF-A1
[2] Finisher-C1
[3] Multi Output Tray C1
[4] Saddle Finisher C2
[5] Finisher-E1
[6] Cassette Feeding Unit-S1
[7] Cassette Feeding Unit-R1
[8] Paper Deck-B1
[3]
[2]
[5]
[8]
[4]
[6]
[7]
[1]

COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
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nSystem Accessories
[1] Handset-C1 [120V ONLY]
[2] Expansion Board Base Unit-C1
[3] SCSI Interface Board-D1
[4] Printer Board
[5] Super G3 FAX Board
[6] Battery Board-A1
* PDL I/F Board.
[1]
[5]
*
[4]
[3]
[2] [6]

COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
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When Turning Off the Main Power Switch
Be sure always to turn off the main power switch and disconnect the power plug before starting
disassembly work. In addition,
1. When expanding the fax functions, the secondary battery used to retain fax memory images
will start to operate as soon as the main power switch is turned off. Be sure to complete any
work within one hour if the main power switch must be kept off. (Be sure also to keep the
machine powered at least for one week after installation.)
2. The communication memory lamp on the control panel indicates the presence/absence of fax
memory images. If it is on (indicating the presence of images), be sure to print out the images
before turning off the main power switch and disconnecting the power plug.
3. Turing off the control panel power switch will not remove power from some units. Be sure
always to turn off the main power switch before starting disassembly/assembly work.
4. The power will not be removed even when the front door is opened as long as the control panel
power switch and the main power switch are both on.
COPY FAX OPTIONS
Communication memory lamp
Control panel power switch
Main power lamp
Main power
switch
Cassette heater
switch

COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
vi
Connectors for the Pick-Up/Delivery Accessories
When connecting accessories, be sure to use the connectors indicates in the diagram. If, for
example, you connect the paper deck to the cassette pedestal connector and turn on the paper, the
fuse on the paper deck PCB will blow, at times requiring replacement with a new PCB.
For the Feeder
For the Paper deck
For the Cassette Feeding Unit
For the Finisher
Figure. Rear View of the Body

COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) vii
CONTENTS
CHAPTER 1 GENERAL DESCRIPTION
I. FEATURES..................................1-1
II. SPECIFICATIONS.......................1-2
A. Type........................................1-2
B. Method ...................................1-2
C. Performance...........................1-3
D. Paper Deck-B1.......................1-4
E. Others ....................................1-5
F. Default Ratios.........................1-6
G. Copying Speed ......................1-7
III. NAMES OF PARTS.....................1-9
A. External view..........................1-9
B. Cross Section...................... 1-11
IV. OPERATION............................. 1-13
A. Turning On the Power ......... 1-13
B. Control Panel ...................... 1-14
C. Special Features Modes ..... 1-15
D. Additional Functions ........... 1-16
V. ROUTINE MAINTENANCE BY
THE USER ............................... 1-19
VI. SAFETY ................................... 1-20
A. Safety of Laser Light (CLASS 1
LASER PRODUCT) ............ 1-20
B. CDRH Regulations ............. 1-21
C. Handling the Laser Unit ...... 1-22
D. Safety of Toner .................... 1-24
VII. IMAGE FORMATION................ 1-25
A. Outline................................. 1-25
CHAPTER 2 BASIC OPERATION PROVIDES
I. BASIC OPERATION....................2-1
A. Functional Construction .........2-1
B. Outline of the Electrical
Circuitry..................................2-2
C. Sequence of Operations ........2-4
D. Main Motor (M1) Control
Circuit .....................................2-8
E. Inputs to and Outputs from
the Major PCBs................... 2-10

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COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 4 IMAGE FORMATION SYSTEM
I. OUTLINE.....................................4-1
II. ANALOG IMAGE PROCESSING.. 4-3
A. Outline....................................4-3
B. CCD .......................................4-3
C. AE Processing
(ABC processing)...................4-4
D. A/D Conversion ......................4-5
E. Analog Signal Processing
Block ......................................4-6
III. DIGITAL IMAGE PROCESSING ... 4-7
A. Outline....................................4-7
CHAPTER 5 LASER EXPOSURE SYSTEM
I. OUTLINE.....................................5-1
II. GENERATING THE BD SIGNAL .. 5-3
III. LASER DRIVER PCB .................5-5
A. Outline....................................5-5
B. Stabilizing the Laser Output...5-6
C. Switching the Laser Activation
Mode ......................................5-7
D. Switching the Laser Output....5-7
B. Shading Correction ................4-8
C. Total Processing.....................4-9
D. Density Processing ............. 4-12
E. Binary Processing............... 4-16
F. Image Memory .................... 4-19
G. Overlay Copying.................. 4-21
IV. DISASSEMBLY/ASSEMBLY .... 4-22
A. CCD Unit............................. 4-23
B. IP PCB ................................ 4-24
C. Replacing the ROM DIMM
(on the image processor PCB).. 4-25
IV. CONTROLLING THE LASER
SCANNER MOTOR ....................5-8
A. Outline of Operations.............5-8
B. Turning On and Off the Laser
Scanner Motor .......................5-9
V. DISASSEMBLY/ASSEMBLY .... 5-10
A. Laser Scanner Assembly.... 5-11
CHAPTER 3 EXPOSURE SYSTEM
I. OUTLINE OF OPERATIONS ......3-1
A. Outline....................................3-1
B. Sequence of Operations
(original exposure system).....3-2
II. SCANNER DRIVE SYSTEM.......3-3
III. CONTROLLING THE SCANNING
LAMP...........................................3-4
A. Outline....................................3-4
B. Controlling the Pre-Heating
Mechanism.............................3-5
C. Turning On and Off the
Scanning Lamp ......................3-5
D. Controlling the Intensity .........3-5
E. Detecting Errors .....................3-6
IV. IDENTIFYING THE SIZE OF AN
ORIGINAL ...................................3-7
A. Outline....................................3-7
B. Identifying the Size by the
Paper Sensors (1)..................3-7
C. Identifying the Size by the
Paper Sensors (2)..................3-9
D. Identifying the Size by the
Original Width/Length Sensor
of the Feeder....................... 3-10
V. DISASSEMBLY/ASSEMBLY .... 3-11
A. Scanning System ................ 3-12
B. Scanner Drive Assembly..... 3-13