Original Exposure System

Contents

5.1 Construction ...5-1 5.1.1 Specifications, Controls, and Functions... 5-1 5.1.2 Major Components... 5-1 5.1.3 Construction of the Control System... 5-2 5.1.4 Reader Controller PCB ... 5-3 5.2 Basic Sequence ...5-4 5.2.1 Basic Sequence of Operations ... 5-4 5.2.2 Basic Sequence of Operation in Response to a Press on the Start Key ... 5-5 5.3 Various Control...5-5 5.3.1 Controlling the Scanner Drive System ... 5-5

5.3.1.1 Overview ...5-5 5.3.1.2 Controlling the Scanner Motor...5-6

5.3.2 Enlargement/Reduction... 5-7

5.3.2.1 Changing the Magnification in Main Scanning Direction ...5-7 5.3.2.2 Changing the Magnification in Sub Scanning Direction ...5-7

5.3.3 Controlling the Scanning Lamp ... 5-8

5.3.3.1 Overview ...5-8 5.3.3.2 Scanning Lamp...5-8 5.3.3.3 Controlling the Activation...5-9

5.3.4 Detecting the Size of Originals ... 5-9

5.3.4.1 Overview ...5-9 5.3.4.2 Points of Measurement Used for Original Size Identification ...5-9 5.3.4.3 Overview of Operation...5-10

5.3.5 Dirt Sensor Control ... 5-12

5.3.5.1 Dust Detection in Stream Reading Mode...5-12 5.3.5.2 White Plate Dust Detection Control...5-13

5.3.6 Image Processing ... 5-14

5.3.6.1 Overview ...5-14 5.3.6.2 CCD Drive ...5-15 5.3.6.3 CCD Output Gain Correction, Offset Correction ...5-15 5.3.6.4 CCD Output A/D Conversion ...5-15 5.3.6.5 Outline of Shading Correction ...5-15 5.3.6.6 Shading Adjustment ...5-16 5.3.6.7 Shading Correction...5-16

5.4 Parts Replacement Procedure...5-17

5.4.1 CCD Unit ... 5-17

5.4.1.1 Before Removing the CCD Unit ...5-17 5.4.1.2 Removing the CCD Unit ...5-17 5.4.1.3 When Replacing the CCD Unit...5-17

5.4.2 Copyboard glass... 5-18

5.4.2.1 Removing the Copyboard Glass...5-18 5.4.2.2 When Replacing the Copyboard Glass ...5-18

5.4.3 Scanning Lamp ... 5-18

5.4.3.1 Before Removing the Scanning Lamp ...5-18 5.4.3.2 Removing the Scanning Lamp ...5-18 5.4.3.3 When Replacing the Scanning Lamp ...5-19

5.4.4 Reader Controller PCB ... 5-19

5.4.4.1 Before Removing the Reader Controller PCB ...5-19 5.4.4.2 Removing the Reader Controller PCB ...5-19 5.4.4.3 After Replacing the Reader Controller PCB ...5-20

5.4.5 Interface PCB... 5-20

5.4.5.1 Before Removing the Interface PCB...5-20 5.4.5.2 Removing the Interface PCB ...5-20

5.4.6 Memory PCB ... 5-21

5.4.6.1 Before Removing the Memory PCB... 5-21 5.4.6.2 Removing the memory PCB ... 5-21

5.4.7 Inverter PCB ... 5-21

5.4.7.1 Before removing the inverter PCB ... 5-21 5.4.7.2 Removing the Inverter PCB... 5-21 5.4.7.3 After Replacing the Inverter PCB... 5-22

5.4.8 Scanner Motor... 5-22

5.4.8.1 Before Removing the Scanner Motor ... 5-22 5.4.8.2 Removing the Scanner Motor ... 5-22 5.4.8.3 Mounting the Scanner Motor ... 5-23

5.4.9 ADF Open/Close Sensor... 5-23

5.4.9.1 Before Removing the ADF Open/Close Sensor ... 5-23 5.4.9.2 Removing the ADF Open/Close Sensor ... 5-23

5.4.10 Scanner HP Sensor... 5-23

5.4.10.1 Before Removing the Scanner HP Sensor ... 5-23 5.4.10.2 Removing the Mirror Base HP Sensor ... 5-23

5.4.11 Original Size Sensor ... 5-24

5.4.11.1 Before Removing the Original Size Sensor ... 5-24 5.4.11.2 Removing the original size sensor ... 5-24

5.4.12 Cooling Fan... 5-25

5.4.12.1 Before Removing the Cooling Fan ... 5-25 5.4.12.2 Removing the Cooling Fan ... 5-25

5.4.13 Scanner Drive Cable ... 5-25

5.4.13.1 Outline ... 5-25 5.4.13.2 Before Removing the Scanner Drive Cable... 5-25 5.4.13.3 Removing the Scanner Drive Cable... 5-25 5.4.13.4 Fitting the Scanner Drive Cable... 5-28 5.4.13.5 Adjusting the Position of the No. 1/No. 2 Mirror Base ... 5-28

5.4.14 Waste Toner Box Holder ... 5-29

5.4.14.1 Before Removing the Collecting Toner Bottle Holder ... 5-29 5.4.14.2 Removing the Collecting Toner Bottle Holder... 5-29

5.1 Construction

5.1.1 Specifications, Controls, and Functions

0015-4373

iR5065 / iR 5055 / iR5075 / iR5075N / iR5065N / iR5055N

The specifications, controls, and functions of the machine's original exposure system are as follows:

T-5-1

5.1.2 Major Components

0015-4375

iR5065 / iR 5055 / iR5075 / iR5075N / iR5065N / iR5055N The major components of the original exposure system are as follows:

T-5-2

Item Description

Scanning lamp YG xenon lamp

Original scanning book mode: by moving the scanner

ADF mode: by moving original

Original reading resolution 600 x 600 dpi (main scanning x sub scanning)

Halftone 256 gradations

Scanning position detection by scanner HP sensor

lens single-focal point, fixed type

Magnification [1] in platen mode: 25% to 400%

main scanning direction: image processing by controller block

sub scanning direction: scanning speed variation (No. 1 mirror base; 100% or higher) in combination with image processing by reader block (50% or higher and lower than 100%) in combination with image processing in reader block and controller block (lower than 50%)

[2] ADF mode: 25% to 200%

main scanning direction: image processing in controller block

sub scanning direction: original movement speed variation (50% or higher); in combination with image processing in controller block (lower than 50%)

Scanner drive control No. 1/2 mirror base: control by pulse motor Scanning lamp control [1]activation control by pulse motor

[2]error detection control

Original size detection [1]book mode

sub scanning direction: by reflection type sensor main scanning direction: by CCD

[2] ADF mode

main scanning direction: by slide guide in ADF sub scanning direction: by photosensor in ADF

Item Notation Description

Scanning lamp LA1 xenon lamp (90,000 lx)

Scanner motor M501 2-phase pulse motor (pulse control)

Reader Cooling fan FM501 cools the reader block

ADF open/closed sensor 1 PS501 detects the state (open/closed) of the ADF; at 5 deg

Scanner HP sensor PS502 detects scanner home position

ADF open/closed sensor 2 PS503 detects the state (open/closed) of the ADF (detects timing of size detection at 25 deg)

Original size sensor (AB) --- detects the size in sub scanning direction (AB-configuration)

Original size sensor (inch) --- detects size in sub scanning direction (inch)

Interface PCB --- controls motor and fan, connects printer and ADF

Memory PCB --- data delivery between main controler and reader contoler/ADF

Mirror --- No. 1, 2, 3 mirrors

Inverter PCB --- drives the scanning lamp

CCD unit --- collects image data, performs analog image processing

F-5-1

F-5-2

F-5-3

5.1.3 Construction of the Control System

0015-4376

iR5065 / iR 5055 / iR5075 / iR5075N / iR5065N / iR5055N

The construction of the control system of the machine's original exposure system is as follows:

Reader controller PCB

---controls the reader unit as a whole, performs digital image processing

Item Notation Description

Memory PCB Interface PCB

Scanning lamp Reader cooling fan

Inverter PCB CCD unit

Scanner HP sensor ADF

open/closed sensor 2

Reader controller PCB Original size sensor (inch) Original size

sensor (A/B) Scanner motor

ADF open/closed sensor 1

Platen glass Original

scanning lamp Lens CCD

No. 1 mirror

No. 1 mirror base No. 2 mirror

No. 2 mirror base

No. 3 mirror

HP

Image leading edge

Size detection Stream reading position

(start position)

(forward)

(reverse) Scanner motor

Light-blocking plate

No. 2 mirror base

scanning lamp

No. 1 mirror base Scanner HP

sensor

F-5-4

5.1.4 Reader Controller PCB

0015-4379

iR5065 / iR 5055 / iR5075 / iR5075N / iR5065N / iR5055N The functional construction of the reader controller PCB is as follows:

J312

open/closed sensor 1

ADF open/closed

sensor 2

Reader controller PCB

Interface PCB To printer (main controller)

Reader cooling fan

To ADF To printer

Reader controller Interface PCB PCB

Memory PCB To printer (main controller)

To DADF

Inverter PCB

Scanning lamp

Scanning lamp activation control

F-5-5

T-5-3

T-5-4

5.2 Basic Sequence

5.2.1 Basic Sequence of Operations

0015-4382

iR5065 / iR 5055 / iR5075 / iR5075N / iR5065N / iR5055N Basic Sequence of Operation at Power-On

Jack Description J201 used for input of power from the machine (printer unit)

J202 used for communication with the ADF (sensor signal input, fan control, scanner motor control, controller)

J203 used for communication with the printer unit; connects to the scanner motor; used for communication with the ADF; used for input of image signals

J204 used for connection with the CCD unit.

J205 used for communication with the CCD unit.

J206 used for connection with the inverter PCB.

J207 used for connection with the original size sensor (AB).

J208 used for connection with the original size sensor (inch).

J209 not used J210 not used.

IC Description

IC1 CPU (holds boot program)

IC2 ASIC (holds RAM)

IC3 flash ROM (stores firmware)

IC4 EEPROM (backs up service mode settings)

J203 J202

Original size sensor (AB)

Original size sensor (inch)

(dotted line):back

Image processing (shading correction)

Storage of system software (flash ROM)

Backup of

service mode settings

F-5-6

5.2.2 Basic Sequence of Operation in Response to a Press on the Start Key

0015-4384

iR5065 / iR 5055 / iR5075 / iR5075N / iR5065N / iR5055N

Basic Sequence of Operation in Response to a Press on the Start Key (book mode; 1 original)

F-5-7 Basic Sequence of Operation in Response to a Press on the Start Key (ADF mode; 1 original)

F-5-8

5.3 Various Control

5.3.1 Controlling the Scanner Drive System 5.3.1.1 Overview

0015-4387

iR5065 / iR 5055 / iR5075 / iR5075N / iR5065N / iR5055N

The following shows the components associated with the scanner drive system:

Reader motor

Scanner unit position

(shading position)HP

CCD output correction

- shift shading - fixed shading - white plate dust detection control - shading correction

HP (shading position) Main power switch ON

Reader motor

STBY SREADY SCFW SCRW

Reverse Forward

HP (shading position) Image trailing edge HP (shading position) Platen board cover scan start position shift White plate dust detection control

Shading correction

STBY SREADY SCRW SCFW STBY

Reverse Stream reading position shift White plate dust detection Shading correction

Stream reading position

Stream reading dust detection

Shading position shift

White plate dust detection control

Shading correction

F-5-9 [1] Scanner Motor M501 Drive Signal

starts/stops the motor; controls the direction and speed of its rotation [2] Scanner HP Detection Signal

detects the presence of the No. 1 mirror base at home position

5.3.1.2 Controlling the Scanner Motor

0015-4389

iR5065 / iR 5055 / iR5075 / iR5075N / iR5065N / iR5055N

The configuration of the system used to control the scanner motor is as follows; the motor driver on the interface PCB operates according to the signals from the CPU to start/stop the scanner motor and to control the direction and speed of its rotation

F-5-10 1. Reverse Movement After a Scan

After an image scan, the No. 1 mirror base is moved in reverse as far as the shading position at 234 mm/sec regardless of the selected magnification.

2. Forward Movement During a Scan

During an image scan, the No. 1 mirror base is controlled at the speed indicated in the following figure; the No. 1 mirror base is moved forward at 325 mm/sec for 100% magnification.

No.2 mirror base

Scanning lamp

No.1 mirror base Scanner

HP sensor

Reader controller PCB

Motor

[1] Scanner motor control signal

Start position

Acceleration

Image leading edge

Constant speed

Image trailing edge

Deceleration

[1] Acceleration interval: accelerates up to scan speed [2] Run-up interval: run-up margin used to ensure stable speed [3] Image read interval: segment over which images are read

[4] Deceleration interval: at the image trailing edge, decelerates and stops as soon as possible HP

In document Ir5075 Series Sm (Page 139-149)