Canon D1, D2 Service Manual

Color Image Reader Unit - D1/D2

Product Outline

Technology

Periodic Servicing

Parts Replacement and Cleaning Procedure

Adjustment

Installation

Appendix

SERVICE MANUAL Rev4

654321

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.

not be copied, reproduced or translated into another language, in whole or in part, without the

written consent of Canon Inc.

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.

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,

accompanies the symbol, the arrow

represents the path of mechanical drive; where a signal name

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.

Blank Page

Contents

0 Safety Precautions

Notes Before it Works Serving ---------------------------------------------0-2

1 Product Outline

Features (Reader) ------------------------------------------------------------1-2 Specications (Reader) ------------------------------------------------------1-2 Names of Parts (Reader) ---------------------------------------------------1-3

External View ----------------------------------------------------------------------- 1-3 Cross Section ----------------------------------------------------------------------- 1-3

Major Components ------------------------------------------------------------------------- 1-4 Reader Relay PCB ------------------------------------------------------------------------- 1-4

Features (DADF) --------------------------------------------------------------1-5 Specications (DADF) -------------------------------------------------------1-5 Names of Parts (DADF) -----------------------------------------------------1-6

External View ----------------------------------------------------------------------- 1-6 Cross Section ----------------------------------------------------------------------- 1-6

2 Technology

Technology (Reader) ---------------------------------------------------------2-2

Basic Sequence -------------------------------------------------------------------- 2-2

Basic Sequence at Power-On ----------------------------------------------------------- 2-2 Basic Sequence at Start Key ON (book mode/1 original) ------------------------ 2-2 Basic Sequence at Start Key ON (ADF mode/1 original) ------------------------- 2-2

Controls (Reader) -------------------------------------------------------------2-3

Controlling the Scanner Drive System ------------------------------------------------ 2-3 CCD -------------------------------------------------------------------------------------------- 2-4 Enlargement/Reduction ------------------------------------------------------------------- 2-6 Detecting the Size of Originals ---------------------------------------------------------- 2-6 Dirt Sensor Control ------------------------------------------------------------------------- 2-8 Image Processing -------------------------------------------------------------------------2-10 Reader Heater Control -------------------------------------------------------------------2-12

Basic Conguration (DADF) ---------------------------------------------- 2-13

Component Conguration ------------------------------------------------------2-13

Outline of Electric Circuits ---------------------------------------------------------------2-13 Sensor Layout ------------------------------------------------------------------------------2-14

Drive Conguration --------------------------------------------------------------- 2-14 Outline of Operation Modes ---------------------------------------------------- 2-15

Outline ---------------------------------------------------------------------------------------- 2-15 Forward Pickup/Delivery Operation ---------------------------------------------------2-15 Forward Pickup/Reverse Delivery Operation ---------------------------------------2-16

Controls (DADF) ------------------------------------------------------------- 2-18

Document Detection -------------------------------------------------------------2-18

Outline ---------------------------------------------------------------------------------------- 2-18 Initial Document Size Detection --------------------------------------------------------2-19 Detecting Jams -----------------------------------------------------------------------------2-19

Power Supply ----------------------------------------------------------------------2-20 Fan -----------------------------------------------------------------------------------2-20

3 Periodic Servicing

Work of Service (Reader) ---------------------------------------------------3-2

List of Work for Scheduled Servicing -------------------------------------------------- 3-2 Action to take when replacing parts ---------------------------------------------------- 3-2 Consumables -------------------------------------------------------------------------------- 3-2 Service precautions ------------------------------------------------------------------------ 3-2

Work of service (DADF) -----------------------------------------------------3-3

When replacing the parts -------------------------------------------------------- 3-3 Periodic Servicing ------------------------------------------------------------------ 3-3

List of Work for Scheduled Servicing (DADF) -------------------------3-4

4 Parts Replacement and Cleaning Procedure

List of Parts(Reader) ---------------------------------------------------------4-2

External Covers -------------------------------------------------------------------- 4-2 Main Units --------------------------------------------------------------------------- 4-2 List of Clutchs, Solenoids, Motors, Fans, PCBs --------------------------- 4-2 List of Sensors ---------------------------------------------------------------------- 4-2 Consumable Parts Requiring Periodic Replacement and Cleaning Points --------------------------------------------------------------------------------- 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 -------------------------------------------- 4-4

Main Units/Parts (Reader) --------------------------------------------------4-5

Removing the CCD Unit ---------------------------------------------------------- 4-5

Action to Take after Replacing the CCD Unit ---------------------------------------- 4-7

Removing the Platen Glass ----------------------------------------------------- 4-8

Action to Take after Replacing the Platen Glass ------------------------------------ 4-8

Removing the ADF Scan Glass ------------------------------------------------ 4-9

Action to Take after Replacing the ADF Scan Glass ------------------------------- 4-9

List of Parts(DADF) --------------------------------------------------------- 4-11

External Covers ------------------------------------------------------------------- 4-11 Consumable Parts Requiring Periodic Replacement and Cleaning Points -------------------------------------------------------------------------------- 4-11 List of Clutchs, Solenoids, Motors, Fans, PCBs --------------------------4-12 List of Sensors ---------------------------------------------------------------------4-12

External Covers (DADF) -------------------------------------------------- 4-13

Removing the Front Cover -----------------------------------------------------4-13 Removing the Rear Cover ------------------------------------------------------ 4-13 Removing the Feeder Cover --------------------------------------------------- 4-14

Main Units (DADF) ---------------------------------------------------------- 4-15

Removing the Feed Unit --------------------------------------------------------4-15

Consumable Parts Requiring Periodic Replacement and Cleaning Points (DADF) --------------------------------------------------------------- 4-16

Removing the Pickup Roller Unit ---------------------------------------------4-16 Removing the Separation Pad -------------------------------------------------4-17 Replacing the Stamp -------------------------------------------------------------4-17 Exchanging the Feed Roller Guide -------------------------------------------4-18

Clutch Solenoid Motor Fan PCB (DADF) ----------------------------- 4-19

Removing the ADF Motor(M1) -------------------------------------------------4-19 Removing the Release Motor(M2) --------------------------------------------4-19 Removing the Pressurization Solenoid(SL1) ------------------------------4-20 Pickup Clutch/Registration Clutch(CL1/CL2) -----------------------------4-20 Removing the ADF Driver PCB ------------------------------------------------4-21

Removing the LED PCB --------------------------------------------------------4-22 Removing the Fan ----------------------------------------------------------------4-22 Removing the Sensor(SR1,SR2,SR3) ---------------------------------------4-23 Removing the Timing Sensor(SR4) ------------------------------------------4-27 Removing the Document Set Sensor(SR5) --------------------------------4-27 Removing the Cover Open/Closed Sensor(SR6) -------------------------4-27 Removing the Last Document Detection Sensor(SR7) -----------------4-27 Removing the Document Length Sensor(SR8,SR9) --------------------- 4-28 Removing the Release Motor HP Sensor(SR11) -------------------------4-28

5 Adjustment

Image position adjustment(Reader) --------------------------------------5-2

Leading Edge Non-Image Width ----------------------------------------------- 5-2 Left Non-Image Width ------------------------------------------------------------ 5-2

Overview (DADF) -------------------------------------------------------------5-3 Adjustment Method (DADF) ------------------------------------------------5-3

Adjusting the Height --------------------------------------------------------------- 5-3

Pre-check ------------------------------------------------------------------------------------- 5-3 Checking the left hinge height ----------------------------------------------------------- 5-4 Adjustment Procedure --------------------------------------------------------------------- 5-5 Adjust the height of the left hinge ------------------------------------------------------- 5-5 Check the height of the right hinge ----------------------------------------------------- 5-5 Adjust the height of the right hinge ----------------------------------------------------- 5-5

Adjusting the Perpendicularity -------------------------------------------------- 5-6 Adjusting the Read Position ----------------------------------------------------- 5-7 Adjusting the Horizontal Registration ----------------------------------------- 5-7 Adjusting the Trailing Edge Registration ------------------------------------- 5-7 Adjusting the Magnication ------------------------------------------------------ 5-7 Adjusting the White Level -------------------------------------------------------- 5-8

6 Installation

How to Utilize This Installation Procedure ------------------------------6-2

Illustrations Used in This Procedure ------------------------------------------ 6-2 Descriptions Used in This Procedure ----------------------------------------- 6-2 When Using the Contained Parts (Bundled Components in the Shipping Carton) -------------------------------------------------------------------------------- 6-2

Symbols in the Illustration ------------------------------------------------------- 6-2

Caution During Installation --------------------------------------------------6-3 Turning OFF the Host Machine Power ----------------------------------6-3 Checking the Contents ------------------------------------------------------6-4 Installation Procedure --------------------------------------------------------6-5 Operation Check ------------------------------------------------------------ 6-16

Appendix

Service Tools ----------------------------------------------------------------------ii

Solvents and Oils ------------------------------------------------------------------------------ ii Special Tools ------------------------------------------------------------------------------------ ii

General Circuit Diagram(DADF) -------------------------------------------- iii

General Circuit Diagram ---------------------------------------------------------------------iii

General Circuit Diagram(Reader) ------------------------------------------- iv

General Circuit Diagram ------------------------------------------------------------iv

Signal Name List(Reader) -----------------------------------------------------v Signal Name List(DADF) ------------------------------------------------------ vi

Signal Name List -------------------------------------------------------------------------------vi

Safety Precautions

Notes Before it Works Serving

■

Safety Precautions > Notes Before it Works Serving

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.

0-2

Safety Precautions > Notes Before it Works Serving

0-2

Product Outline

Features (Reader)

■

Specications (Reader)

■

Names of Parts (Reader)

■

Features (DADF)

■

Specications (DADF)

■

Names of Parts (DADF)

■

Product Outline

Product Outline > Specications (Reader)

1-2

Features (Reader)

• Adapting Reading sensor, allows low power consumption and high-speed trigger.

• Exposure to light by white color LED, enables low power consumption, size reducing, and

color balance improvement.

• Color aberration-free.

Specications (Reader)

The major specications, controls and functions of the original exposure system are described

below.

Item Specication/function Original exposure Original scan In book mode

In ADF mode Maximum original size Read resolution Gradation Carriage position detection Magnication

Main scanning

direction

Sub scanning

direction Lens CCD

CCD unit drive control Original size detection

In book mode

Indirect exposure by LED (LED & photoconductive body) Scan by movement of CCD Stream reading with CCD xed 297mm x 432mm (In book mode) 600 dpi (main scanning) x 600 dpi (sub scanning) 256 gradation CCD HP sensor (SR1) 25% to 400%

Image is processed on main controller PCB 2

Gauss 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: 304mm By scanner motor (M1) Main scanning direction: by CCD

Sub scanning direction: by reection sensor (AB/INCH)

Product Outline > Specications (Reader)

In ADF mode

Main scanning direction: by photo interrupter on DADF

Sub scanning direction: by photo interrupter on DADF

T-1-1

1-2

Product Outline > Names of Parts (Reader) > Cross Section

1-3

Names of Parts (Reader)

External View

[5]Reader PCB Cover

[4]Reader Rear Cover

[3]Reader Left Cover

[10]Stream Read Glass

[6]Rear Small Cover

[9]Copyboard Glass

[7]Reader Right Cover

[1]Reader Front Cover

[2]Reader Front Sub Cover

F-1-1

Cross Section

Stream reading glass

CCD unit

Copyboard glass

F-1-3

Reader Right Cover

Product Outline > Names of Parts (Reader) > Cross Section

Reader PCB Cover

Connector Cover

Reader Rear Cover

F-1-2

1-3

]Original Size Sensor 1

Product Outline > Names of Parts (Reader) > Cross Section > Reader Relay PCB

1-4

■Major Components

Following shows major components of document exposure system.

[SR3]Copyboard Cover Open/Closed Sensor(Front)

[SR2]Copyboard Cover Open/Closed Sensor(Rear)

[SR1]CCD HP Sensor

[H5]Reader Heater(Option)

[PCB1]Relay Board

Item Notation Specication/function

Scanner motor M1 Pulse motor: controls the carriage drive CCD HP sensor SR1 Detects CCD home position Copyboard Cover Open/Closed Sensor (front) Copyboard Cover Open/Closed Sensor (rear)

SR2 Ends original size identication with the copy board

cover at 15 deg

SR3 Detects the copyboard cover open/close. Starts original

size identication with the copy board cover at 5 and 25 deg.

Original Size Sensor 0 SR4 Helps identify original size(AB, INCH/AB, A)

Original Size Sensor 1 SR5 Helps identify original size(INCH/AB, INCH/A) CCD unit - Indirect exposure by LED (LED & photoconductive

body) Reader Heater (Option) H5 Prevents condensation on the copyboard glass Reader relay PCB PCB1 The part of the image processing

[M1]Scanner Motor

[H5]Reader Heater(Option)

[SR5

[SR4]Original Size Sensor 0

[8]CCD Unit

F-1-4

T-1-2

■Reader Relay PCB

The function conguration of reader controller PCB is described below.

J511

J501

J508

J502

J505

IC501

Jack No Description

J501 Connection to original size sensor

J502 Connection to original size sensor J503 Power supply to DADF J504 Communication with DADF J505 Connection to Scanner motor J506 Connection to original size sensor J507 Communication with main controller PCB 2 J508 Communication with CCD J509 Communication with DADF J510 Connection to copyboard cover open/close sensor and CCD HP sensor J511 Receives power from the host machine (printer unit) J512 Communication with main controller PCB 2

J503

J509

J507

J506

J510

J504

J512

F-1-5

T-1-3

Product Outline > Names of Parts (Reader) > Cross Section > Reader Relay PCB

1-4

Product Outline > Specications (DADF)

1-5

Features (DADF)

• Mixed size loading mode enables the feeder to handle the different width originals in a job.

• New body shape and color.

• Interface cable is wired inside the body.

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 Document longer than 432 mm

Document size AB type: B6/A5/B5/A4/B5R/A5R/A4R/B4/A3 (B6:Cross feed

Document tray capacity 50 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

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.)

- Double-sided document processing

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

T-1-4

Product Outline > Specications (DADF)

1-5

Product Outline > Names of Parts (DADF) > Cross Section

Names of Parts (DADF)

1-6

External View

Feeder Cover

Front Cover

Document supply tray

Slide guide

Rear Cover

Document delivery tray

F-1-6

Cross Section

[11]

[13]

[12]

[1] [2]

No. Part name

[1] Lower registration roller [2] Upper registration roller [3] Feed roller [4] Separation pad unit [5] Pickup roller [6] Document supply tray [7] Upper delivery reversal roller [8] Lower delivery reversal roller

[9] Read roller 2 (lower) [10] Read roller 2 (upper) [11] Platen roller [12] White sheet [13] Read roller [14] Read roller 1 (lower) [15] Read roller 1 (upper)

[3] [5][4] [6]

[7][8][9][10][15] [14]

F-1-7

T-1-5

Product Outline > Names of Parts (DADF) > Cross Section

1-6

Technology

Technology (Reader)

■

Controls (Reader)

■

Basic Conguration

■

(DADF) Controls (DADF)

■

Technology

Technology > Technology (Reader) > Basic Sequence > Basic Sequence at Start Key ON (ADF mode/1 original)

2-2

Technology (Reader)

Basic Sequence

■Basic Sequence at Power-On

ON STBY

( )

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

CCD adjustment

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.

Dust detection control

B F F F B F

Light-ON

Shading correction

White board duct detection control

In stream reading

B B

F F F F

Light-ON

End

F-2-3

Copy start

(Scanner motor)

(LED)

(CCD HP sensor )

White board duct detection control

In reading

Light-ON

ON ON

Shading correction

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 > Technology (Reader) > Basic Sequence > Basic Sequence at Start Key ON (ADF mode/1 original)

End

F-2-2

2-2

Technology > Controls (Reader)

2-3

Controls (Reader)

■Controlling the Scanner Drive System

●Overview

Parts conguration of scanner drive is described below.

Scanner motor (M1)

Reader relay PCB (PCB1)

Copyboard cover

open/closed sensor (SR3)

Sensor light block plate

Backward

Copyboard cover

open/closed sensor (SR2)

CCD HP sensor (SR1)

Carriage drive belt

Forward

CCD unit

●Scanner Motor Control

Scanner motor driver turns on/off the motor and controls its direction/speed of rotation

according to the signals from CPU.

Main controller PCB 2

3.3V +24V

OPM_ENB

OPM_CLK

CPU

OPM_CWB

MOT_VREF

OPM_STB

NOTE: The scanning speed of this machine is as follows. Black/white (600dpi x 600dpi):30ipm Color (600dpi x 600dpi):30ipm

Reader relay PCB

+5V

Motor driver

F-2-5

Guide shaft

- Scanner motor (M1) drive signal

Turns on/off the motor and controls its direction/speed of rotation.

- CCD HP sensor (SR1) detection signal

Checks if CCD is at home position.

- Copyboard cover open/closed sensor (front: SR2/rear: SR3) detection signal

Detects the open/close status of the copyboard cover

Technology > Controls (Reader)

F-2-4

2-3

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)

2-4

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

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).

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]

Original

trailing edge

Stop

Deceleration

F-2-6

■CCD

●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. CCD elemental size: 4.7 μm

3. Lens diameter: 18mm dia

4. Light source: LED

5. Effective number of pixel: 7500 pix x 3 color lines, 7500 pix x 1 B/W line

[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.

Technology > Controls (Reader)

2-4

Technology > Controls (Reader)

LED lens cover

2-5

LED (light source)

Photoconductive body

F-2-7

mirror No.4

mirror No.2

mirror No.5

Lens

LED (light source)

mirror No.3

mirror No.1

Lens

CCD

Black & White (B/W) line

Red (R) line

Green (G) line

Blue (B) line

Technology > Controls (Reader)

F-2-8

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

2-5

Technology > Controls (Reader)

2-6

■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 controller2 PCB.

●Magnication in Sub Scanning Direction

In book mode/ADF mode

An original is read at 140mm/s and the data is processed by the main controller PCB 2.

■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

- Sub scanning direction: Reection type photo sensor (AB type: 1 point, inch type: 1 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.

AB type

Original detection position 1

B6 Original detection position 2 Original detection position 3 Original detection position 4

CCD original detection position

Original sensor 0

B5R

A4R

Inch type

Original detection position 1

Original detection position 2

Original detection

position 3

CCD original detection position

STMT

STMTR

LTR

LTRR

Original sensor 1

LGL

279.4×431.8mm (11"×17")

F-2-9

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 absence (absence). It indicates absence

of original if both signals show Yes (presence).

Borderline of

original size

approx 13mm

1A=additional

detection point 1

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 0, 1 to

identify sizes.

Technology > Controls (Reader)

Borderline of

original size

approx 4mm

1B=conventional

detection point 2

F-2-10

2-6

Technology > Controls (Reader)

2-7

Change Result of detection

1A 1B

Yes Yes Original absence

No Yes Original presence

Yes No Original presence

No No Original presence

T-2-2

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.

Rear side

Original sensor 0

Position of detection 1

Position of detection 2 Position of detection 3

Position of detection 4

Front side

CCD original detection position

F-2-11

In case of B5 size original

Position of

detection

1 Yes Yes 2 No Yes 3 Yes Yes 4 No No

Result of detection Result of

identication

T-2-3

●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

ADF

Reader unit

Position of detection 1 Position of detection 2 Position of detection 3 Position of detection 4

original detection position

CCD

2) ADF opened

CCD unit: moves to original detection position

LED: OFF

Original sensor: OFF

(External light)

3) ADF closed

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 checks

the reection light (4 points). For sub scanning direction, original sensor detects the size.

Original sensor

Copyboard glass

F-2-12

F-2-13

Technology > Controls (Reader)

2-7

Technology > Controls (Reader)

2-8

■Dirt Sensor Control

（External light）

F-2-14

25°

F-2-15

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 identies the original size by the combination of level changes at 5 points (in

case of AB type size).

5°

F-2-16

5) Standby status (waiting for start key)

CCD unit: in original detection position

LED: OFF

Original sensor: OFF

●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)

Main power switch

WMUP

Start key

STBY

Dust detection control

1st SCAN

Dust detection control

2nd SCAN

Dust detection control

F-2-18

Technology > Controls (Reader)

F-2-17

2-8

Technology > Controls (Reader)

2-9

[Particulars of control]

- At the end of a job (dust detection)

CCD checks the light reected 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.

- 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

Technology > Controls (Reader)

B C

F-2-19

Stream reading glass

LED

Lens

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)

CCD

F-2-20

2-9

Technology > Controls (Reader)

2-10

■Image Processing

●Overview

The functions of image processing system’s PCB are described below.

- Main controller PCB 2 CCD drive, analog image process, A/D conversion, shading correction (executed per each job), shading adjustment (executed at power-on)

- CCD PCB Analog image process, A/D conversion

The machine uses the main controller PCB to process images for every single image line.

Specic functions are as follows.

a. Main controller PCB 2

- Shading correction

b. CCD PCB (inside CCD unit)

- CCD drive

- CCD output gain correction, offset correction

CCD PCB

CCD(4lines )

Analog image signal

Analog image process

- gain correction

- offset correction

CCD/AP PCB

EEP-

CCD drive control

A/D conversion

ASIC

ROM

CCD control signal

Gain correction data

Digital image signal

Main controller PCB 2

CPU

Shading correction/ adjustment

EEP-

ROM

SRAM

Digital image signal

●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 (R, G, B, 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

F-2-22

●Gain Correction and Offset Correction of CCD Output

The analog video signal generated by the CCD is corrected so that it will have a specic level

(gain correction); moreover, the output voltage occurring in the absence of incident light is

also corrected so that it will have a specic level (offset correction).

Technology > Controls (Reader)

F-2-21

●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.

2-10

Technology > Controls (Reader)

●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

reected by the standard white board. After the reected light is digitalized, it is held in the

shading correction circuit on main controller PCB as a shading coefcient.

Shading correction circuit compares the stored target value with the shading coefcient. 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.

2-11

●PASCAL Control (image gradation)

Changes in temperature/humidity or wear on the machine can cause changes in gradation

characteristics. The PASCAL control mechanism is used to stabilize gradation characteristics

of images on paper. It makes up for the changes in gradation characteristics in response to

changes in temperature/humidity or wear on the machine.

Description of Control

Start-up

• COPIER>ADJUST>PASCAL>OFST-P-Y

• COPIER>ADJUST>PASCAL>OFST-P-M

• COPIER>ADJUST>PASCAL>OFST-P-C

• COPIER>ADJUST>PASCAL>OFST-P-K

Prints out the test pattern stored in the main controller.

Sets the previously printed-out test print in the reader and reads it by the scanner.

Prepares the image correction table A *1(data processing)

End

CCD output

Target value

Measurement value

Technology > Controls (Reader)

Features after correction

Features before correction

White

Standard white plate

*1 The image correction table A created in PASCAL control is applied only in copy mode.

Timing of Control

Any time: During execution of automatic gradation correction in the user mode

Original density

F-2-23

2-11

Technology > Controls (Reader)

2-12

■Reader Heater Control

The reader heater is installed the to prevent dew condensation in the reader unit.

[Reader heater ON timing]

If the environmental switch is turned ON, the reader heater is always ON regardless of states

such as power supply ON/OFF of the machine, the sleep.

Technology > Controls (Reader)

F-2-24

2-12

Technology > Basic Conguration (DADF) > Component Conguration > Outline of Electric Circuits

Basic Conguration (DADF)

Component Conguration

■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 main controller PCB2.

Clutch

Fan

2-13

ADF driver PCB

J9 J11

J509 J503J504

J10

Reader relay PCB

Motor

Sensor

Solenoid

Main controller PCB2

F-2-25

Technology > Basic Conguration (DADF) > Component Conguration > Outline of Electric Circuits

2-13

Technology > Basic Conguration (DADF) > Drive Conguration

2-14

■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 Last document detection sensor SR8 Document length sensor 2 SR9 Document length sensor 1

SR11 Release motor HP sensor

PS1 Document width sensor2 PS2 Document width sensor1

T-2-4

Drive Conguration

SL1

CL2 CL1

F-2-26

SL2

F-2-27

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 dual-

sided 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-2-5

Technology > Basic Conguration (DADF) > Drive Conguration

2-14

Technology > Basic Conguration (DADF) > Outline of Operation Modes > Forward Pickup/Delivery Operation

2-15

Outline of Operation Modes

■Outline

This machine has four operation modes. This machine operates in the operation mode

specied 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.

Single-sided document -> Simplex printing Single-sided document -> Duplex printing Double-sided document -> Duplex printing Double-sided document -> Simplex printing

T-2-6

■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

Technology > Basic Conguration (DADF) > Outline of Operation Modes > Forward Pickup/Delivery Operation

Pickup of first document sheet/ Formation of loop

Waiting for reading of the first document sheet

Pickup of second document sheet

Formation of second document

To next

F-2-28

2-15

+ 69 hidden pages

Canon D1, D2 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Product Outline

Technology

Periodic Servicing

Parts Replacement and Cleaning Procedure

Adjustment

Installation

Appendix