Canon H1, DADF-AG1 Service Manual
Color Image Reader Unit - H1
Product Outline
Technology
Periodic Servicing
Parts Replacement and Cleaning Procedure
Adjustment
Installation
Appendix
SERVICE MANUAL Rev0
654321
Application
This manual has been issued by Canon Inc. for qualied 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.
© CANON INC. 2013
Caution
Use of this manual should be strictly supervised to avoid disclosure of condential
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.
The following rules apply throughout this Service Manual:
1. Each chapter contains sections explaining the purpose of specic 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.
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.
Set the cable/wire to the
cable guide or wire saddle.
Remove the screw.
Tighten the screw.
Turn on the 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
Notes Before it Works Serving ---------------------------------------------0-8
Points to Note at Cleaning --------------------------------------------------0-8
1
Product Outline
Original Exposure System (Reader) -------------------------------------1-2
Features (Reader) ----------------------------------------------------------------- 1-2
Specications (Reader) ------------------------------------------------------1-2
Specications -------------------------------------------------------------------------------- 1-2
Names of Parts (Reader) ---------------------------------------------------1-3
External View -------------------------------------------------------------------------------- 1-3
Cross Section -------------------------------------------------------------------------------- 1-3
Major Components ------------------------------------------------------------------------- 1-3
Reader Relay PCB ------------------------------------------------------------------------- 1-4
Features (DADF) --------------------------------------------------------------1-5
Specications (DADF) -------------------------------------------------------1-5
Names of Parts (DADF) -----------------------------------------------------1-5
External View ----------------------------------------------------------------------- 1-5
Cross Section ----------------------------------------------------------------------- 1-5
2
Technology
Controls (Reader) -------------------------------------------------------------2-2
Basic Sequence ----------------------------------------------------------------------------- 2-2
Controlling the Scanner Drive System ------------------------------------------------ 2-3
CCD Unit -------------------------------------------------------------------------------------- 2-4
Enlargement/Reduction ------------------------------------------------------------------- 2-6
Detecting the Size of Originals ---------------------------------------------------------- 2-6
Dirt Sensor Control ------------------------------------------------------------------------2-10
Image Processing ------------------------------------------------------------------------- 2-11
Color offset correction in sub scanning ----------------------------------------------2-13
Servicing (Reader)
------------------------------------------------------------------- 2-14
Periodically Replaced Parts -------------------------------------------------------------2-14
Consumable Parts -------------------------------------------------------------------------2-14
Periodical Servicing -----------------------------------------------------------------------2-14
Action to take when replacing parts ---------------------------------------------------2-14
Major Adjustments -------------------------------------------------------------------------2-14
Troubleshooting ----------------------------------------------------------------------------2-14
Basic Conguration (DADF) ---------------------------------------------- 2-15
Component Conguration ------------------------------------------------------2-15
Outline of Electric Circuits ---------------------------------------------------------------2-15
Drive Conguration --------------------------------------------------------------- 2-15
Sensor Layout ------------------------------------------------------------------------------2-16
Outline of Operation Modes ---------------------------------------------------- 2-16
Outline ---------------------------------------------------------------------------------------- 2-16
Forward Pickup/Delivery Operation ---------------------------------------------------2-16
Forward Pickup/Reverse Delivery Operation ---------------------------------------2-17
Controls (DADF) ------------------------------------------------------------- 2-19
Document Detection -------------------------------------------------------------2-19
Outline ---------------------------------------------------------------------------------------- 2-19
Initial Document Size Detection --------------------------------------------------------2-20
Document Pickup/Separation --------------------------------------------------2-21
Basic Pickup Operation ------------------------------------------------------------------2-21
Pickup Unit and Stopper -----------------------------------------------------------------2-22
Document Reversing -------------------------------------------------------------2-22
Basic Operation ----------------------------------------------------------------------------2-22
Document Feeding/Delivery ----------------------------------------------------2-23
Basic Operation ----------------------------------------------------------------------------2-23
Release Operation ------------------------------------------------------------------------2-24
Detecting Jams -------------------------------------------------------------------- 2-24
Jams ------------------------------------------------------------------------------------------2-24
Power Supply ----------------------------------------------------------------------2-25
Power Supply -------------------------------------------------------------------------------2-25
Stamp Operation ------------------------------------------------------------------ 2-25
Outline ---------------------------------------------------------------------------------------- 2-25
Fan -----------------------------------------------------------------------------------2-26
Fan Operation ------------------------------------------------------------------------------2-26
Work of service (DADF) --------------------------------------------------- 2-27
When replacing the parts -------------------------------------------------------2-27
0
1-5
Periodic Servicing -----------------------------------------------------------------2-27
3
Periodic Servicing
List of Work for Scheduled Servicing ------------------------------------3-2
4
Parts Replacement and Cleaning Procedure
List of Parts(Reader) ---------------------------------------------------------4-2
External Covers -------------------------------------------------------------------- 4-2
List of Electrical Components --------------------------------------------------- 4-2
External Covers(Reader) ----------------------------------------------------4-3
Removing the Reader Left Cover ---------------------------------------------- 4-3
Removing the Reader Front Cover -------------------------------------------- 4-3
Removing the Reader Right Cover -------------------------------------------- 4-3
Removing the Reader Rear Cover -------------------------------------------- 4-3
Original Exposure System (Reader) -------------------------------------4-4
Removing the Platen Glass ----------------------------------------------------- 4-4
Removing the ADF Scan Glass ------------------------------------------------ 4-5
Removing the CCD Unit ---------------------------------------------------------- 4-6
Cleaning in the CCD unit (Mirror No. 1 - 5) ---------------------------------4-10
Removing the Reader Controller PCB --------------------------------------- 4-11
Removing the Reader Assembly ----------------------------------------------4-12
List of Parts (DADF) -------------------------------------------------------- 4-15
External Covers -------------------------------------------------------------------4-15
Consumable Parts Requiring Periodic Replacement and Cleaning
Points --------------------------------------------------------------------------------4-15
List of Clutchs, Solenoids, Motors, Fans, PCBs --------------------------4-16
Others -------------------------------------------------------------------------------- 4-16
List of Sensors ---------------------------------------------------------------------4-17
External Covers (DADF) -------------------------------------------------- 4-18
Removing the Front Cover -----------------------------------------------------4-18
Removing the Rear Cover ------------------------------------------------------ 4-18
Removing the Feeder Cover --------------------------------------------------- 4-19
Main Units (DADF) ---------------------------------------------------------- 4-20
Removing the Feed Unit --------------------------------------------------------4-20
Consumable Parts Requiring Periodic Replacement and Cleaning
Points (DADF) --------------------------------------------------------------- 4-22
Removing the Pickup Roller Unit ---------------------------------------------4-22
Removing the Separation Pad -------------------------------------------------4-23
Replacing the Stamp -------------------------------------------------------------4-23
Exchanging the Feed Guide ---------------------------------------------------4-24
Clutch Solenoid Motor Fan PCB (DADF) ----------------------------- 4-25
Removing the ADF Motor(M1) -------------------------------------------------4-25
Removing the Release Motor(M2) --------------------------------------------4-25
Removing the Pressurization Solenoid(SL1) ------------------------------4-26
Pickup Clutch/Registration Clutch(CL1/CL2) ------------------------------4-26
Removing the ADF Driver PCB ------------------------------------------------4-27
Removing the LED PCB --------------------------------------------------------4-28
Removing the Fan ----------------------------------------------------------------4-28
Removing the Sensor(SR1,SR2,SR3) ---------------------------------------4-29
Removing the Timing Sensor(SR4) ------------------------------------------4-32
Removing the Document Set Sensor(SR5) --------------------------------4-32
Removing the Cover Open/Closed Sensor(SR6) ------------------------- 4-32
Removing the Document Length Sensor(SR7,SR10) -------------------4-33
Removing the A4R/LTRR Identication Sensor(SR8) -------------------4-33
Removing the Release Motor HP Sensor(SR11) -------------------------4-34
Removing the Document Width Volume(VR1) ----------------------------4-34
Removing the hinge -------------------------------------------------------------- 4-35
Removing the left hinge ------------------------------------------------------------------4-35
Removing the Right hinge ---------------------------------------------------------------4-35
Removing the Platen roller -----------------------------------------------------4-36
5
Adjustment
Overview (Reader) ------------------------------------------------------------5-2
When replacing parts (Reader) --------------------------------------------5-2
Platen Glass --------------------------------------------------------------------------------- 5-2
ADF Scan Glass ---------------------------------------------------------------------------- 5-3
CCD Unit -------------------------------------------------------------------------------------- 5-3
Overview (DADF) -------------------------------------------------------------5-6
Outline -------------------------------------------------------------------------------- 5-6
Adjustment Method (DADF) ------------------------------------------------5-7
Preparation or Creation of Test Chart ----------------------------------------- 5-7
Adjusting the Height of the hinge ---------------------------------------------- 5-7
0
1-5
0
1-6
Pre-check ------------------------------------------------------------------------------------- 5-7
Adjustment Procedure --------------------------------------------------------------------- 5-7
Check the height of the left hinge ------------------------------------------------------ 5-8
Check the height of the right hinge ----------------------------------------------------- 5-8
Adjust the height of the left hinge ------------------------------------------------------- 5-9
Adjust the height of the right hinge ----------------------------------------------------- 5-9
Adj of DADF Tray width ---------------------------------------------------------5-10
AB-Conguration Adjustment -----------------------------------------------------------5-10
Inch-Conguration Adjustment ---------------------------------------------------------5-10
Adjusting the Perpendicularity ------------------------------------------------- 5-10
Scan position auto adj in DADF mode --------------------------------------- 5-11
Adj img pstn in DADF mode:horz scan --------------------------------------5-12
Adj of DADF img lead edge margin: front -----------------------------------5-12
Fine adj of DADF image magnictn: front ----------------------------------5-13
White level adj ---------------------------------------------------------------------5-13
6
Installation
How to Utilize This Installation Procedure ------------------------------6-2
When using the parts included in the package ----------------------------- 6-2
Symbols in the Illustration ------------------------------------------------------- 6-2
Caution During Installation --------------------------------------------------6-2
Check Items when Turning OFF the Main Power ---------------------6-2
Checking the Contents ------------------------------------------------------6-3
Installation Procedure --------------------------------------------------------6-5
Installation Procedure ------------------------------------------------------------- 6-5
Signal Name List (DADF) ------------------------------------------------------v
Signal Name List ------------------------------------------------------------------------------- v
Appendix
Service Tools ----------------------------------------------------------------------ii
General Circuit Diagram(Reader) ------------------------------------------- iii
General Circuit Diagram (DADF) --------------------------------------------iv
0
Special Tools ------------------------------------------------------------------------------------ ii
Oils and Solvents ------------------------------------------------------------------------------ ii
General Circuit Diagram (1/1) -----------------------------------------------------iii
General Circuit Diagram (1/1) -----------------------------------------------------iv
1-6
Safety Precautions
Notes Before it Works Serving
■
Points to Note at Cleaning
■
0
Safety Precautions > Points to Note at Cleaning
Notes Before it Works Serving
CAUTION:
At servicing, be sure to turn off the power source according to the specied steps and
disconnect the power plug.
CAUTION:
Do not turn off the power switch when downloading is under way. Turning off the main
power switch while downloading is under way can disable the machine.
Points to Note at Cleaning
0-8
CAUTION:
When performing cleaning using organic solvent such as alcohol, be sure to check
that the component of solvent is vaporized completely before assembling.
Safety Precautions > Points to Note at Cleaning
0
0-8
Product Outline
1
Original Exposure System
■
(Reader)
Specications (Reader)
■
Names of Parts (Reader)
■
Features (DADF)
■
Specications (DADF)
■
Names of Parts (DADF)
■
Product Outline
1
1
Product Outline > Specications (Reader)
1-2
Original Exposure System (Reader)
Features (Reader)
• Adapting new CCD unit, allows low power consumption.
• Improvement of the CCD unit disassembly
Specications (Reader)
■Specications
Item Specication/function
Original exposure
Original scan In book mode
In ADF mode
Read resolution
Gradation
Carriage position detection
Magnication
Main scanning
direction
Sub scanning
direction
Lens
CCD
CCD unit drive control
Original size
detection
In book mode
In ADF mode
Indirect exposure by LED (LED & photoconductive body)
Scan by movement of CCD
Stream reading with CCD xed
600 dpi (main scanning) x 600 dpi (sub scanning)
256 gradation
CCD HP sensor (S11)
25% to 400%
Image is processed on main controller PCB 2
In book mode: speed change by carriage travel, image
process on main controller PCB *1
In ADF mode: original feed speed change, image process on
main controller PCB *1
ST lens
Number of lines: 4 (R, G, B, B/W)
Number of pixels: 7500 x 3 color lines, 7500 x 1 B/W line
Maximum original read width: 317.5mm
By scanner motor (M14)
Main scanning direction: by CCD
Sub scanning direction: by reection sensor
Main scanning direction: by photo interrupter on DADF
Sub scanning direction: by photo interrupter on DADF
Product Outline > Specications (Reader)
1
T-1-1
*1 Controls differ depending on magnications. Refer to [Magnications] for more information.
1-2
1
Reader rear cover
CCD unit Platen glass
ADF scan glass
M14
Product Outline > Names of Parts (Reader)
1-3
Names of Parts (Reader)
■External View
■Cross Section
Reader left cover
Reader front cover
F-1-1
F-1-2
■Major Components
Following shows major components of document exposure system.
UN4
S13
S12
S11
H6
CCD unit
Item Notation Specication/function
Scanner motor
CCD HP sensor
Copyboard Cover Open/
Closed Sensor (front)
Copyboard Cover Open/
Closed Sensor (rear)
Original Size Sensor 1
Original Size Sensor 2
CCD unit
Reader Heater (Option)
Reader controller PCB
M14 Pulse motor: controls the carriage drive
S11 Detects CCD home position
S12 Ends original size identication with the copy board
cover at 5 deg
S13 Detects the copyboard cover open/close. Starts original
size identication with the copy board cover at 30 deg.
S15 Helps identify original size(AB, INCH/AB/K, A)
S14 Helps identify original size(INCH/AB/K, INCH/A)
- Indirect exposure by LED (LED & photoconductive
body)
H6 Prevents condensation on the copyboard glass
UN4 Controls the reader unit drive and image process
H6
S14
S15
F-1-3
T-1-2
Product Outline > Names of Parts (Reader)
1
1-3
1
Product Outline > Names of Parts (Reader)
■Reader Relay PCB
The function conguration of reader controller PCB is described below.
J501
J508 J507
J503
1-4
J504
J505 J509
Jack No Description
J501 Communication with CCD
J502 Communication with main controller PCB
J503 Connection to Scanner motor
J504 Receives power from the machine (printer unit)
J505 Power supply to DADF
J506 Connection to copyboard cover open/close sensor and CCD HP sensor
J507 Connection to original size sensor 2
J508 Connection to original size sensor 1
J509 Communication with DADF
J510 Not used
J502
J506
J510
F-1-4
T-1-3
Product Outline > Names of Parts (Reader)
1
1-4
1
Product Outline > Names of Parts (DADF) > Cross Section
1-5
Features (DADF)
The mixed mode of the different width manuscript.
The detection of the different manuscript type (AB type / inch type).
Specications (DADF)
Item Specications
Document pickup method Automatic pickup and delivery
Document loading direction Face-up
Document loading position Aligned to center
Document separation method Upper separation
Document type Single -sided AB type: 42-128 g/m2
Inch type: 50-128 g/m2
Double-sided 50-128 g/m2
Color document 64-128 g/m2
Black and White/
Color Mixed
Document longer
than 432 mm
Document size AB type: B6/A5/B5/A4/B5R/A5R/A4R/B4/A3 (B6:Cross feed only)
Document tray capacity 100 sheets (80g/m2)
Document processing mode - Single-sided document processing
Document size recognition Available (Standard size)
Mixed document function Same types of paper can be mixed.
Book document Supported (The document thickness must be 50 mm or less.)
Interface with Install Connected
Equipment
Power supply Supplied from host machine
Dimensions 565 mm×510 mm×145 mm (W×D×H)
Weight Approx. 7.9 kg
50-128 g/m2 (Color:64-128 g/m2)
Single-sided one sheetFeed: 60- 90g/ m2
INCH type: STMT/LTR/LTRR/LGL/11"×17" (STMT:Cross feed
only)
Others:8K/16K
Document width: 148-297mm
Document length (longitudinal): 128-432mm (“630mm” is held by
the operator.)
- Double-sided document processing
Equivalent to that in continuous feed mode is assured.
Different types of paper can be mixed.
Different types original mixable combination:
A/B type: A3/B4R,A4/B5,B4/A4R,B5/A5,A4R/B5R,A5/B6
Inch type: LDR/LGL,LTR/LGL,LTR/STMT
Cereal Interface
Names of Parts (DADF)
External View
Feeder Cover
Front Cover
Document supply tray
Cross Section
Upper registration roller
Lower registration roller
Platen roller
Read roller
White sheet
Read roller 1 (upper)
Separation pad unit
Read roller 2 (lower)
Read roller 2 (upper)
Slide guide
Document delivery tray
Pickup roller Feed roller
Upper delivery reversal roller Read roller 1 (lower)
Lower delivery reversal roller
Rear Cover
F-1-5
Document supply tray
F-1-6
Product Outline > Names of Parts (DADF) > Cross Section
1
1-5
Technology
2
Controls (Reader)
■
Servicing (Reader)
■
Basic Conguration
■
(DADF)
Controls (DADF)
■
Work of service (DADF)
■
2
Technology
2
ON STBY
CCD adjustment
Dust detection
Technology > Controls (Reader)
2-2
Controls (Reader)
■Basic Sequence
●Basic Sequence at Power-On
(Scanner
motor)
(LED)
(CCD
HPsensor)
Footnote
• F: Scanner motor moves forward (toward right).
• B: Scanner motor moves backward (toward left).
• Light-ON: LED on CCD unit lights-on.
• ON: When CCD HP sensor (photo interrupter type) detects.
●Basic Sequence at Start Key ON (book mode/1 original)
B F
Light-ON
ON
F-2-1
●Basic Sequence at Start Key ON (ADF mode/1 original)
Copy start
(Scanner
motor)
(LED)
(CCD HP
sensor )
Dust detection control
This is activated when any of the following conditions is true.
• Dust has been detected in all 3 locations at previous 1 job.
• Dust detection could not be activated due to JAM etc at previous job.
Footnote
• F: Scanner motor moves forward (toward right).
• B: Scanner motor moves backward (toward left).
• Light-ON: LED on CCD unit lights-on.
• ON: When CCD HP sensor (photo interrupter type) detects.
control
B F F F B F
Light-ON
ON
In stream reading
Shading correction
F F F F
B B
Light-ON
End
F-2-3
Copy start
(Scanner
motor)
(LED)
(CCD HP
sensor )
Footnote
• F: Scanner motor moves forward (toward right).
• B: Scanner motor moves backward (toward left).
• Light-ON: LED on CCD unit lights-on.
• ON: When CCD HP sensor (photo interrupter type) detects.
Technology > Controls (Reader)
B
2
In reading
F
Light-ON
B
ON ON
Shading correction
End
F
F-2-2
2-2
2
Scanner motor (M14)
Original
Acceleration area: Accelerates until a speed suited to the selected mode is reached
Deceleration area: Decelerates and stops promptly once the image end is reached.
Technology > Controls (Reader)
2-3
■Controlling the Scanner Drive System
●Conguration of drive system
Parts conguration of scanner drive is described below.
Reader controller PCB (UN4)
Copyboard cover
open/closed sensor (S13)
Copyboard cover
open/closed sensor (S12)
CCD HP sensor (S11)
• Scanner motor (M14) drive signal
Turns on/off the motor and controls its direction/speed of rotation.
• CCD HP sensor (S11) detection signal
Checks if CCD is at home position.
• Copyboard cover open/closed sensor (front: S12/rear: S13) detection signal
Detects the open/close status of the copyboard cover
Sensor light
block sheet
Backward
Guide shaft
Carriage drive belt
Forward
CCD unit
F-2-4
●Scanner Motor Control
1) Forward movement when scanning an image
CCD operation is controlled by the following sensors when scanning the image.
Start position
position
Acceleration
Shift
speed
[1] [2] [3] [4]
Shift distance
NOTE:
The scanning speed of this machine is as follows.
Black/white (600dpi x 600dpi):260 mm/sec
Color SEND(600dpi x 300dpi):140 mm/sec
2) Backward movement after scanning an image
After scanning an image, CCD moves backward to CCD shading position at a specic
speed (260 mm/sec).
Original
leading edge
Normal speed
[1]
[2]Run-up speed area: Run-up margin to ensure a stable speed.
[3]Image reading area: Reads an image at a specific speed.
[4]
trailing edge
Stop
Deceleration
F-2-5
Technology > Controls (Reader)
2
2-3
2
Technology > Controls (Reader)
■CCD Unit
●Overview
The machine uses the CCD to expose and read an image and the image is read on a line-by-
line basis.
CCD features 4 lines (R, G, B, B/W) and B/W line is used in B/W copy and R, G, B lines are
used at color scan.
CCD overview
1. Integrated scanning conguration; CCD, lens, light source and mirror are integrated.
2. Light source: LED
3. Effective number of pixel: 7500 pix x 3 color lines, 7500 pix x 1 B/W line
4. Color lter: Colored lter (Red/Green/Blue)
[Optical path from LED]
The light generated from LED is reected by an original and by the 5 mirrors. And then it is
irradiated to the CCD through the lens.
2-4
LED (light source)
Photoconductive
body
Technology > Controls (Reader)
2
2-4
2
Technology > Controls (Reader)
Lens
mirror
No.4
mirror
No.2
LED (light source)
mirror No.3
Items Description
CCD
Lens
LED(light
source)
Mirror No. 1 - 5
Receives the reected light that has gone through the lens and converts it into
electric signal to output it.
Collects the light reected by an original.
Light source to expose an original to laser
Return the light
2-5
F-2-6
T-2-1
mirror
No.5
Lens
Technology > Controls (Reader)
2
mirror No.1
CCD
Red (R) line
Green (G) line
Blue (B) line
Black & White (B/W) line
F-2-7
2-5
2
Technology > Controls (Reader)
2-6
■Enlargement/Reduction
●Magnications in Main Scanning Direction
In book mode/ADF mode
An image is read at 100% in main scanning direction. Magnication variation and its data
process are controlled on main controller PCB 2.
●Magnication in Sub Scanning Direction
To vary the magnication of sub scanning direction, the machine operates as below
depending on the original reading methods and the magnications.
1) Magnications in book mode
To suite the selected rate of magnication, the machine changes the speed of original
reading and executes data processing on main controller PCB 2.
e.g.) Reduction to 25%: an original is read at 260mm/s, and the data is processed for 25%
reduction (skipping for 4/1) by the main controller PCB 2.
e.g.) at 100%: an original is read at 260mm/s.
Operation Magnications
25% to 50% 50.1% to 199.9% 200% to 400%
Speed change of original reading
(mm/sec)
Digital magnication process (%) on
the main controller PCB 2
2) Magnications in ADF mode
To suite the selected rate of magnication, the machine changes the speed of original
reading and executes data processing on main controller PCB 2.
e.g.) Reduction to 25%: an original is read at 260mm/s and the data is processed for 25%
reduction (skipping 4/1) by the main controller PCB.
e.g.) Enlargement to 200%: an original is read at 130mm/s and the data is processed for
100% direct reproduction by main controller PCB.
Operation Magnications
Speed change of original reading
(mm/sec)
Digital magnication process (%) on
the main controller PCB 2
260 260 130
25 to 50 50.1 to 199.9 100 to 200
T-2-2
25% to 50% 50.1% to 199.9% 200% to 400%
260 260 130
25 to 50 50.1 to 199.9 100 to 200
T-2-3
■Detecting the Size of Originals
●Overview
The machine identies the original size by the combination of measurement result of reection
light from the reection sensor and specic points of CCD. Also to identify it accurately even
though an original moves when ADF is closed, the machine measures 2 points for each size.
• Main scanning direction: CCD (AB type: 12 points measurement, inch type: 6 points
measurement)
• Sub scanning direction: Reection type photo sensor (AB type: 1 point, inch type: 1 point,
AB/inch type: 2 point)
The followings are the procedures of original size identication.
1) External light search (main scanning direction only)
According to the LED status, the machine identies the CCD level of each detection
position in main scanning direction.
2) Output level detection of each sensor
The machine turns on the LED on CCD unit and measures the CCD level of each detection
position in main scanning direction.
Also, turns on the LED on reection type photo sensor in sub scanning direction and
measures the sensor output.
The original size is identied by the combination of these output result.
●Control Details
For main scanning direction, the machine moves the CCD unit to the following CCD original
detection positions according to the location of original to measure the CCD level of each
detection position. For sub scanning direction, the machine uses the original sensor 1, 2 to
identify sizes.
Technology > Controls (Reader)
2
2-6
AB type
detection point 1
1B=conventional
2
Technology > Controls (Reader)
Original detection
position 1
Original detection
position 2
Original detection
position 3
Original detection
position 4
Original detection position 5
Original detection position 6
A5
B5
A5R
K16
A4
Original sensor 1
B5R
A4R
B4
K8
A3
2-7
1. 2 points original detection at each detection position
For each point of measurement in main scanning direction, the machine checks the
presence/absence of an original with reference to the CCD output at 2 points near the point
of measurement.
* The machine checks if the signal is changed or not from ADF (pressure plate) open to close
at both points of 1A and 1B.
Change in the signal: Yes
Change in the signal: No
Judgment is done by the measurement results of 1A and 1B, and it indicates the presence
of original if either point shows No (absence). It indicates absence of original if both signals
show Yes (presence).
CCD original detection position
Inch type
Original detection
position 1
Original detection
position 2
Original detection
position 3
CCD original detection position
STMTR
STMT
LTR
LTRR
Original sensor 2
LGL
279.4×431.8mm
(11"×17")
F-2-8
Borderline of
original size
Borderline of
original size
1A 1B
Yes Yes
No Yes
Yes No
No No
approx 13mm
approx 4mm
1A=additional
detection point 2
Change Result of detection
Original absence
Original presence
Original presence
Original presence
F-2-9
T-2-4
Technology > Controls (Reader)
2
2-7
2
Rear
Technology > Controls (Reader)
2-8
2. Priority on the front sensor
When checking the measurements for main scanning direction, if the absence of an original
is indicated at the rear while the presence of an original is indicated at the front, the machine
will give priority to the indication at the front.
side
Original sensor 1
Position of
detection 1
Position of
detection 2
Position of
detection 3
Front
side
CCD original
detection position
Position of
detection 4
Position of detection 5
Position of detection 6
B5
F-2-10
●Detection Operation Overview
1) Standby state (The following is in case that the AB type, A4R size is set.)
CCD unit: shading position
LED: OFF
Original sensor: OFF
CCD unit
Copyboard glass
Original sensor
Position of detection 1
Position of detection 2
ADF
Reader unit
CCD original detection position
2) ADF opened
CCD unit: moves to original detection position
LED: OFF
Original sensor: OFF
Position of detection 3
Position of detection 4
Position of detection 5
Position of detection 6
F-2-11
In case of B5 size original
Position of detection Result of detection Result of identication
1 Yes Yes
2 No Yes
3 Yes Yes
4 Yes Yes
5 No No
6 No No
Technology > Controls (Reader)
2
(External
light)
F-2-12
3) ADF closed
T-2-5
CCD unit: in original detection position
LED: OFF to ON
Original sensor: in original detection operation
• With the ADF angle at 25 deg or less, the external light is blocked at the original width
area. Then, the machine determines that the original is absent at the points that the
external light is detected (external light search operation). When the original mount
sensor (rear) detects [close], original size detection is started. In this case, B5/B4/A4/
A3 size is eliminated at this point.
• After external light search, LED is turned ON at main scanning side and the CCD
2-8
2
Technology > Controls (Reader)
2-9
checks the reection light (4 points). For sub scanning direction, original sensor
detects the size.
(External
light)
F-2-13
25 deg
F-2-14
4) ADF fully closed (5 deg or less)
CCD unit: in original detection position
LED: ON
Original sensor: in original detection operation
• For 2 sec from the original mount sensor (front) detected [close], this monitors the
changes of output level of each sensor. The machine determines that the original is
present in the position where the level is not changed.
The machine identies the original size by the combination of level changes at 5 points
(in case of AB type size).
Original sensor: OFF
F-2-16
5) Standby status (waiting for start key)
CCD unit: in original detection position
LED: OFF
Technology > Controls (Reader)
2
5 deg
F-2-15
2-9
2
Main power
Technology > Controls (Reader)
2-10
■Dirt Sensor Control
●Overview
The machine changes the original read point or executes image correction depending on
the presence/absence of dust on the stream reading glass or the platen roller of the ADF to
prevent the dust from showing up in the output. These operations are carried out only when
the ADF is in use and, in addition, is closed.
[Control timing]
• At the end of a job
• Between sheets (for each reading of a sheet)
• At the start of a job (only when any of the following conditions is true.)
Dust detected at all points of detection at the end of the previous job
Dust detection failed to end normally at the end of the previous job (e.g., ADF opened)
switch ON
WMUP
Start key
STBY
ON
Dust detection
control
1st
SCAN
Dust detection
control
2nd
SCAN
Dust detection
control
F-2-17
[Particulars of control]
• At the end of a job (dust detection)
CCD checks the light reected by the surface of the platen roller of the ADF at the read
point to detect the presence/absence of dust. Presence of dust is detected at points A, B,
and C in this order. The point where least dust is detected will be used as the read position
for the next job. The point selected here will be used as the read position for the next job.
• At the start of a job (dust bypass)
Presence of dust is detected at points A, B, and C in this order in the same manner as at
the end of the job. Read will take place at the point where least dust is detected.
B C
A
F-2-18
2-10
Technology > Controls (Reader)
2
2
CCD PCB
Technology > Controls (Reader)
2-11
• Between sheets
The machine does not move CCD.
It reads the original using the position determined at the end or start of a job; however,
if the presence of dust is still detected at the position, the machine will execute image
correction.
Platen roller
0.5mm0.5mm
A B C
Stream
reading glass
F-2-19
■Image Processing
●Overview
The functions of image processing system’s PCB are described below.
• Main controller PCB Shading correction (executed per each job),
• CCD PCB CCD drive, analog image process, A/D conversion, A/D
conversion
The machine uses the main controller PCB to process images for every single image line.
Specic functions are as follows.
a. Main controller PCB
• Shading correction
• Color offset correction in sub scanning
b. CCD PCB (inside CCD unit)
• CCD drive
• CCD output gain correction, offset correction
CCD (4lines)
Reader controller PCB
Analog image
signal
Analog image
process
- gain correction
- offset correction
EEP-ROM
CCD drive
control
A/D
conversion
ASIC
Shading
correction
Color offset
correction
in sub scanning
Gain
correction
data
Digital
image
signal
SRAM
CPU
Service Mode
(Lv1) COPIER > OPTION > IMG-RDR > DFDST-L1
(used to adjust the dust detection level between sheets)
(Lv1) COPIER > OPTION > IMG-RDR > DFDST-L2
(used to adjust the dust detection level at the end of a job)
Technology > Controls (Reader)
2
CCD/AP PCB
F-2-20
2-11
2
Technology > Controls (Reader)
2-12
●CCD Drive
The machine's CCD sensor is a 4-line linear image sensor consisting of 7500 pixels. After
completion of photoelectric conversion in the light-receiving block, the signals are output to
the analog front end PCB unit on CCD PCB in parallel for each channel (Color scan: R, G, B
B/W scan: B/W) of the CCD array.
Red(R)line
Green(G)line
Blue(B)line
Black & white(B/W)line
Expanse
Light-receiving block
Output
HL L HH L HL H H L
………
F-2-21
●Gain Correction and Offset Correction of CCD Output
The analog video signal generated by the CCD is corrected so that it will have a specic level
(gain correction); moreover, the output voltage occurring in the absence of incident light is
also corrected so that it will have a specic level (offset correction).
●A/D Conversion of CCD Output
The corrected analog video signal is converted into a digital signal that is suited to the voltage
level of individual pixels by the A/D converter.
●Shading Correction (Overview)
The output of the CCD is not necessarily even for the following factors even when the density
of the original is uniform:
1) Variation in the sensitivity of the CCD among pixels
2) Variation in the intensity of the rod lens array
3) Variation in the intensity of light that goes through the center and surroundings of lens
4) Variation in the intensity of light at the center and surroundings of LED
5) LED deterioration
The machine executes shading correction to even out the output of the CCD.
Shading correction may be the shading correction executed for each job.
●Shading Correction
The machine executes the shading correction for every scan made.
In this correction, the analog image process unit on CCD PCB digitalizes the LED light
reected by the standard white board. After the reected light is digitalized, it is held in the
shading correction circuit on main controller PCB as a shading coefcient.
Shading correction circuit compares the stored target value with the shading coefcient. The
difference between the two will be held as the shading correction value for use in correcting
variation among CCD pixels when scanning the original, thus evening out the density levels
of the image.
CCD output
Target value
Measurement
value
Standard white plate
Features after correction
Features before correction
White
Original density
F-2-22
Technology > Controls (Reader)
2
2-12
2
Technology > Controls (Reader)
■Color offset correction in sub scanning
When R, G and B are not accurately synchronized in sub scanning, the color offset correction
will be made so that RED and BLUE synchronize with GREEN by shifting RED and BLUE
image within single pixel in the sub scanning direction.
Example)
For GREEN, RED offsets upward and BLUE offsets downward in the scan for black line
image.
Color offset in
sub scanning
R-G
Color offset in
sub scanning
G-B
MEMO:
Outstanding point of this CCD unit:
• Corrective values are different by the position in the main scanning.
1 line
Before correction
After correction
F-2-23
2-13
There are 12 corrective values in the book scan and 4 values in the ADF scan for the color
offset correction. The color offset corrections have been made at the factory and all the
corrective values have been stored in the service mode. (In COPIER > ADJUST > CCD)
At the beginning of job, color offset correction is performed based on the stored corrective
values.
Book scan ADFADF scan
100% 50% 100% 50%
Main scanning position 0
(rear)
Main scanning position 1
(center)
Main scanning position 2
(front)
Technology > Controls (Reader)
100-RG
100-GB
100-RG-2
100-GB-2
100-RG-3
100-RG-3
50-RG
50-GB
50-RG-2
50-GB-2
50-RG-3
50-GB-3
100DF-RG
100DF-GB
50DF-RG
50DF-GB
T-2-6
2
2-13
2
Technology > Controls (Reader) > Servicing (Reader) > Troubleshooting
2-14
Servicing (Reader)
■Periodically Replaced Parts
None
■Consumable Parts
None
■Periodical Servicing
None
■Action to take when replacing parts
Part name Action
CCD unit
Copyboard glass
Stream reading glass
• Platen board cover white level automatic adjustment
• ADF white level adjustment (This action is applicable only
when the DADF is installed in the host machine.)
• The values input of the label included to the new CCD unit
• White plate data adjustment
• Platen board cover white level automatic adjustment
• ADF white level adjustment (This action is applicable only
when the DADF is installed in the host machine.)
• Platen board cover white level automatic adjustment
• ADF white level adjustment
■Major Adjustments
T-2-7
None
■Troubleshooting
None
Technology > Controls (Reader) > Servicing (Reader) > Troubleshooting
2
2-14
2
Technology > Basic Conguration (DADF) > Drive Conguration
2-15
Basic Conguration (DADF)
Component Conguration
■Outline of Electric Circuits
Electric circuits of this machine are controlled by the main controller PCB2. The main
controller PCB2 detect the input signals from sensors to output the signals that
drive DC loads such as motors, solenoids, clutches, and fans at the predetermined timings.
The ADF driver PCB does not have a memory area; data such as the data used in the service
mode is stored in CCD unit (CCD PCB).
Clutch
Fan
ADF driver PCB
Reader controller PCB
Motor
Sensor
Solenoid
Main controller
PCB2
Drive Conguration
M1
SL1
CL2 CL1
M2
SL2
F-2-25
No Part name Content
M1 ADF motor Feeds documents.
M2 Release motor Prevents a document from swaying.
SL1 Pressurization solenoid Shifts the delivery lower roller after reversal of the
dualsided document, etc.
SL2 Stamp solenoid Drives the stamp mechanism.
CL1 Pickup clutch Drives the pickup clutch to transmit the power of the
pickup/feed motor to the pickup roller unit.
CL2 Registration clutch Drives the registration clutch to transmit the power of
the pickup/feed motor to the registration roller.
T-2-8
Technology > Basic Conguration (DADF) > Drive Conguration
2
F-2-24
2-15
2
Technology > Basic Conguration (DADF) > Outline of Operation Modes > Forward Pickup/Delivery Operation
2-16
■Sensor Layout
SR11
SR4
SR2 SR1
SR5 SR7 PS1/PS2 SR8 SR9
SR3
No Sensor name
SR1 Registration sensor
SR2 Read sensor
SR3 Delivery reversal sensor
SR4 Timing sensor
SR5 Document set sensor
SR7 Document length sensor 1
SR8 A4R/LTRR identication signal
SR10 Document length sensor 2
SR11 Release motor HP sensor
VR1 Document wide volumel
Outline of Operation Modes
■Outline
T-2-9
F-2-26
■Forward Pickup/Delivery Operation
• Simplex read operation (when two document sheets are placed)
NOTE:
This operation is performed for all single-sided documents irrespective of whether
document widths are the same or different.
Document
Reading of first document
sheet
Pickup of first document sheet/
Formation of loop
Pickup of second document
sheet
This machine has two operation modes. This machine operates in the operation mode
specied by the host machine to perform printing. Operation mode names,
brief outline of operations, ad associated print modes are given in the following table.
Operation mode name Outline of operation Associated print mode
Forward pickup/delivery Picks up, reads, and then
delivers a document.
Forward feed/reverse delivery Picks up, reads, reverses, and
delivers a document.
Technology > Basic Conguration (DADF) > Outline of Operation Modes > Forward Pickup/Delivery Operation
Single-sided document ->
Simplex printing
Single-sided document ->
Duplex printing
Double-sided document ->
Duplex printing
Double-sided document ->
Simplex printing
2
T-2-10
Waiting for reading of the
first document sheet
Formation of second document
To next
F-2-27
2-16
2
Technology > Basic Conguration (DADF) > Outline of Operation Modes > Forward Pickup/Reverse Delivery Operation
■Forward Pickup/Reverse Delivery Operation
Duplex read operation (when two document sheets are placed)
NOTE:
This operation is performed for all double-sided documents irrespective of whether
document widths are the same or different.
2-17
Completion of reading of
first document sheet
Start of reading of
second document sheet
Completion of delivery of
first document sheet
Completion of reading of
second document sheet
Completion of delivery of
second document sheet
End ob job
F-2-28
Document
Pickup and formation of loop
of first document sheet
Start of reading of front side
of first document sheet
End of reading of
first document sheet
Technology > Basic Conguration (DADF) > Outline of Operation Modes > Forward Pickup/Reverse Delivery Operation
2
Waiting for reading of
the first document
Stop after feeing the first
document sheet to reversal
position
To next
F-2-29
2-17
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