Canon H1 User manual

654321
Color Image Reader Unit - H1
SERVICE MANUAL Rev0
Product Outline
Technology
Periodic Servicing
Parts Replacement and Cleaning Procedure
Adjustment
Installation
Appendix

Application
This manual has been issued by Canon Inc. for qualied persons to learn technical theory,
installation, maintenance, and repair of products. This manual covers all localities where the
products are sold. For this reason, there may be information in this manual that does not
apply to your locality.
Corrections
This manual may contain technical inaccuracies or typographical errors due to improvements
or changes in products. When changes occur in applicable products or in the contents of this
manual, Canon will release technical information as the need arises. In the event of major
changes in the contents of this manual over a long or short period, Canon will issue a new
edition of this manual.
The following paragraph does not apply to any countries where such provisions are
inconsistent with local law.
Trademarks
The product names and company names used in this manual are the registered trademarks
of the individual companies.
Copyright
This manual is copyrighted with all rights reserved. Under the copyright laws, this manual may
not be copied, reproduced or translated into another language, in whole or in part, without the
written consent of Canon Inc.
© CANON INC. 2013
Caution
Use of this manual should be strictly supervised to avoid disclosure of condential
information.

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

Contents
0 Safety Precautions
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
Specications (Reader) ------------------------------------------------------1-2
Specications -------------------------------------------------------------------------------- 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
Specications (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 Conguration (DADF) ---------------------------------------------- 2-15
Component Conguration ------------------------------------------------------2-15
Outline of Electric Circuits ---------------------------------------------------------------2-15
Drive Conguration ---------------------------------------------------------------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
0
1-5
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 Identication 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
0
1-6
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-Conguration Adjustment -----------------------------------------------------------5-10
Inch-Conguration 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 magnictn: 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
Appendix
Service Tools ----------------------------------------------------------------------ii
Special Tools ------------------------------------------------------------------------------------ ii
Oils and Solvents ------------------------------------------------------------------------------ ii
General Circuit Diagram(Reader) ------------------------------------------- iii
General Circuit Diagram (1/1) -----------------------------------------------------iii
General Circuit Diagram (DADF) --------------------------------------------iv
General Circuit Diagram (1/1) -----------------------------------------------------iv
Signal Name List (DADF) ------------------------------------------------------v
Signal Name List ------------------------------------------------------------------------------- v

Safety Precautions
■Notes Before it Works Serving
■Points to Note at Cleaning

0
0
0-8
0-8
Safety Precautions > Points to Note at Cleaning
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 specied 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
CAUTION:
When performing cleaning using organic solvent such as alcohol, be sure to check
that the component of solvent is vaporized completely before assembling.

1
1Product Outline
Product Outline
■Original Exposure System
(Reader)
■Specications (Reader)
■Names of Parts (Reader)
■Features (DADF)
■Specications (DADF)
■Names of Parts (DADF)

1
1
1-2
1-2
Product Outline > Specications (Reader)
Product Outline > Specications (Reader)
Original Exposure System (Reader)
Features (Reader)
• Adapting new CCD unit, allows low power consumption.
• Improvement of the CCD unit disassembly
Specications (Reader)
■Specications
Item Specication/function
Original exposure Indirect exposure by LED (LED & photoconductive body)
Original scan In book mode Scan by movement of CCD
In ADF mode Stream reading with CCD xed
Read resolution 600 dpi (main scanning) x 600 dpi (sub scanning)
Gradation 256 gradation
Carriage position detection CCD HP sensor (S11)
Magnication 25% to 400%
Main scanning
direction
Image is processed on main controller PCB 2
Sub scanning
direction
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
Lens ST lens
CCD 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
CCD unit drive control By scanner motor (M14)
Original size
detection
In book mode Main scanning direction: by CCD
Sub scanning direction: by reection sensor
In ADF mode Main scanning direction: by photo interrupter on DADF
Sub scanning direction: by photo interrupter on DADF
*1 Controls differ depending on magnications. Refer to [Magnications] for more information.
T-1-1

1
1
1-3
1-3
Product Outline > Names of Parts (Reader)
Product Outline > Names of Parts (Reader)
Names of Parts (Reader)
■External View
Reader rear cover
Reader front cover
Reader left cover
■Cross Section
CCD unit Platen glass
ADF scan glass
F-1-1
F-1-2
■Major Components
Following shows major components of document exposure system.
M14
S14
S15
UN4
S13
S12
S11
CCD unit
H6
H6
Item Notation Specication/function
Scanner motor M14 Pulse motor: controls the carriage drive
CCD HP sensor S11 Detects CCD home position
Copyboard Cover Open/
Closed Sensor (front)
S12 Ends original size identication with the copy board
cover at 5 deg
Copyboard Cover Open/
Closed Sensor (rear)
S13 Detects the copyboard cover open/close. Starts original
size identication with the copy board cover at 30 deg.
Original Size Sensor 1 S15 Helps identify original size(AB, INCH/AB/K, A)
Original Size Sensor 2 S14 Helps identify original size(INCH/AB/K, INCH/A)
CCD unit - Indirect exposure by LED (LED & photoconductive
body)
Reader Heater (Option) H6 Prevents condensation on the copyboard glass
Reader controller PCB UN4 Controls the reader unit drive and image process
F-1-3
T-1-2

1
1
1-4
1-4
Product Outline > Names of Parts (Reader)
Product Outline > Names of Parts (Reader)
■Reader Relay PCB
The function conguration of reader controller PCB is described below.
J508 J507
J503
J504
J505 J509 J502 J510
J506
J501
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
F-1-4
T-1-3

1
1
1-5
1-5
Product Outline > Names of Parts (DADF) > Cross Section
Product Outline > Names of Parts (DADF) > Cross Section
Features (DADF)
The mixed mode of the different width manuscript.
The detection of the different manuscript type (AB type / inch type).
Specications (DADF)
Item Specications
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
50-128 g/m2 (Color:64-128 g/m2)
Document longer
than 432 mm
Single-sided one sheetFeed: 60- 90g/ m2
Document size AB type: B6/A5/B5/A4/B5R/A5R/A4R/B4/A3 (B6:Cross feed only)
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.)
Document tray capacity 100 sheets (80g/m2)
Document processing mode - Single-sided document processing
- Double-sided document processing
Document size recognition Available (Standard size)
Mixed document function Same types of paper can be mixed.
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
Book document Supported (The document thickness must be 50 mm or less.)
Interface with Install Connected
Equipment
Cereal Interface
Power supply Supplied from host machine
Dimensions 565 mm×510 mm×145 mm (W×D×H)
Weight Approx. 7.9 kg
Names of Parts (DADF)
External View
Feeder Cover
Front Cover
Rear Cover
Document supply tray
Document delivery tray
Slide guide
Cross Section
Platen roller
White sheet
Read roller
Document supply tray
Pickup roller Feed roller
Lower registration roller
Upper registration roller
Separation pad unit
Lower delivery reversal roller
Upper delivery reversal roller Read roller 1 (lower)
Read roller 1 (upper)
Read roller 2 (lower)
Read roller 2 (upper)
F-1-5
F-1-6

2
2Technology
Technology
■Controls (Reader)
■Servicing (Reader)
■Basic Conguration
(DADF)
■Controls (DADF)
■Work of service (DADF)

2
2
2-2
2-2
Technology > Controls (Reader)
Technology > Controls (Reader)
Controls (Reader)
■Basic Sequence
●Basic Sequence at Power-On
ON STBY
B F
(Scanner
motor)
Light-ON
(LED)
ON
CCD adjustment
(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)
(Scanner
motor)
Shading correction
Light-ON
Copy start In reading End
F
F
BB
ON ON
(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.
F-2-1
F-2-2
●Basic Sequence at Start Key ON (ADF mode/1 original)
Copy start
Dust detection
control In stream reading End
B F F F B F B B
F F F F
(Scanner
motor)
Light-ON
ON
Shading correction
Light-ON
(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.
F-2-3

2
2
2-3
2-3
Technology > Controls (Reader)
Technology > Controls (Reader)
■Controlling the Scanner Drive System
●Conguration of drive system
Parts conguration of scanner drive is described below.
Forward
Backward
CCD HP sensor (S11)
Scanner motor (M14)
CCD unit
Reader controller PCB (UN4)
Copyboard cover
open/closed sensor (S12)
Guide shaft
Carriage drive belt
Copyboard cover
open/closed sensor (S13) Sensor light
block sheet
• 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
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
Original
leading edge
Normal speed
Original
trailing edge
Deceleration
Stop
Shift
speed
Shift distance
[1] [2] [3] [4]
[1]
Acceleration area: Accelerates until a speed suited to the selected mode is reached
[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]
Deceleration area: Decelerates and stops promptly once the image end is reached.
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 specic
speed (260 mm/sec).
F-2-5

2
2
2-4
2-4
Technology > Controls (Reader)
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 conguration; 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 reected by an original and by the 5 mirrors. And then it is
irradiated to the CCD through the lens.
Photoconductive
body
LED (light source)

2
2
2-5
2-5
Technology > Controls (Reader)
Technology > Controls (Reader)
LED (light source)
Red (R) line
CCD
Lens
mirror
No.4
mirror
No.2
mirror No.3
mirror No.1
mirror
No.5
Lens
Green (G) line
Blue (B) line
Black & White (B/W) line
F-2-6
F-2-7
Items Description
CCD Receives the reected light that has gone through the lens and converts it into
electric signal to output it.
Lens Collects the light reected by an original.
LED(light
source)
Light source to expose an original to laser
Mirror No. 1 - 5 Return the light
T-2-1

2
2
2-6
2-6
Technology > Controls (Reader)
Technology > Controls (Reader)
■Enlargement/Reduction
●Magnications in Main Scanning Direction
In book mode/ADF mode
An image is read at 100% in main scanning direction. Magnication variation and its data
process are controlled on main controller PCB 2.
●Magnication in Sub Scanning Direction
To vary the magnication of sub scanning direction, the machine operates as below
depending on the original reading methods and the magnications.
1) Magnications in book mode
To suite the selected rate of magnication, 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 Magnications
25% to 50% 50.1% to 199.9% 200% to 400%
Speed change of original reading
(mm/sec)
260 260 130
Digital magnication process (%) on
the main controller PCB 2
25 to 50 50.1 to 199.9 100 to 200
2) Magnications in ADF mode
To suite the selected rate of magnication, 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 Magnications
25% to 50% 50.1% to 199.9% 200% to 400%
Speed change of original reading
(mm/sec)
260 260 130
Digital magnication process (%) on
the main controller PCB 2
25 to 50 50.1 to 199.9 100 to 200
T-2-2
T-2-3
■Detecting the Size of Originals
●Overview
The machine identies the original size by the combination of measurement result of reection
light from the reection sensor and specic 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: Reection type photo sensor (AB type: 1 point, inch type: 1 point,
AB/inch type: 2 point)
The followings are the procedures of original size identication.
1) External light search (main scanning direction only)
According to the LED status, the machine identies 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 reection type photo sensor in sub scanning direction and
measures the sensor output.
The original size is identied 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.

2
2
2-7
2-7
Technology > Controls (Reader)
Technology > Controls (Reader)
Original sensor 1
B5
A5
A4
B5R
A4R
A5R
B4
A3
K8
K16
LTRR
STMT
LTR
LGL
279.4×431.8mm
(11"×17")
Original sensor 2
AB type
Inch type
STMTR
CCD original detection position
CCD original detection position
Original detection
position 1
Original detection
position 2
Original detection
position 3
Original detection
position 1
Original detection
position 2
Original detection
position 3
Original detection
position 4
Original detection position 5
Original detection position 6
F-2-8
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).
approx 4mm
approx 13mm 1A=additional
detection point 1
Borderline of
original size
1B=conventional
detection point 2
Borderline of
original size
Change Result of detection
1A 1B
Yes Yes Original absence
No Yes Original presence
Yes No Original presence
No No Original presence
F-2-9
T-2-4