G422_SM

G422 SERVICE MANUAL

002180MIU RICOH GROUP COMPANIES

G

422 SER

VICE M

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RICOH GROUP COMPANIES

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G422 SERVICE MANUAL

002180MIU

It is the reader's responsibility when discussing the information containedwithin this document to maintain a level of confidentiality that is in the bestinterest of Ricoh Corporation and its member companies.

NO PART OF THIS DOCUMENT MAY BE REPRODUCED IN ANY FASHION AND DISTRIBUTED WITHOUT THE PRIOR

PERMISSION OF RICOH CORPORATION. All product names, domain names or product illustrations, includingdesktop images, used in this document are trademarks, registeredtrademarks or the property of their respective companies. They are used throughout this book in an informational or editorial fashiononly and for the benefit of such companies. No such use, or the use ofany trade name, or web site is intended to convey endorsement or otheraffiliation with Ricoh products.

2005 RICOH Corporation. All rights reserved.

The Service Manual contains information regarding service techniques, procedures,processes and spare parts of office equipmentdistributed by Ricoh Corporation. Users of thismanual should be either service trained orcertified by successfully completing a RicohTechnical Training Program.

Untrained and uncertified users utilizinginformation contained in this service manual torepair or modify Ricoh equipment risk personalinjury, damage to property or loss of warrantyprotection.

Ricoh Corporation

WARNING

LEGEND

PRODUCT CODE COMPANY GESTETNER LANIER RICOH SAVIN

G422 IS200e

DOCUMENTATION HISTORY

REV. NO. DATE COMMENTS * 02/2005 Original Printing

SM i G422

G422 TABLE OF CONTENTS

INSTALLATION

1. INSTALLATION PROCEDURE.................................................... 1-1 1.1 INSTALLATION REQUIRMENTS..............................................................1-1

1.1.1 ENVIRONMENT ...............................................................................1-1 1.1.2 MACHINE LEVEL.............................................................................1-1 1.1.3 MINIMUM SPACE REQUIRMENTS.................................................1-1 1.1.4 POWER REQUIRMENTS.................................................................1-1

1.2 MAINFRAME AND OPTION INSTALLATION PROCEDURES .................1-2 1.2.1 MAINFRAME ....................................................................................1-2

Accessory check...................................................................................1-2 Installation procedure............................................................................1-2

1.2.2 RACK: G822-17 (OPTION)...............................................................1-3 ACCESSORY CHECK..........................................................................1-3 Installation procedure............................................................................1-4 Moving the Printer...............................................................................1-12

PREVENTIVE MAINTENANCE

2. PREVENTIVE MAINTENANCE SCHEDULE............................... 2-1 2.1 USER MAINTENANCE .............................................................................2-1

REPLACEMENT AND ADJUSTMENT

3. REPLACEMENT AND ADJUSTMENT ........................................ 3-1 3.1 SPECIAL TOOLS ......................................................................................3-1 3.2 REPLACEMENT........................................................................................3-1

3.2.1 FEED UNIT.......................................................................................3-1 3.2.2 SEPARATION PAD ..........................................................................3-2 3.2.3 ADF REAR COVER..........................................................................3-2 3.2.4 ORIGINAL SET AND REGISTRATION SENSORS..........................3-3 3.2.5 READ AND EXIT SENSORS............................................................3-4 3.2.6 ADF WHITE PLATE..........................................................................3-5

Installing the ADF white plate ...............................................................3-5 3.2.7 FEED MOTOR AND TRANSPORT MOTOR....................................3-6

Feed motor ...........................................................................................3-6 Transport motor ....................................................................................3-6 Attaching the feed and transport motor.................................................3-6

3.2.8 SCANNER TOP COVER ..................................................................3-7 3.2.9 EXPOSURE GLASSES....................................................................3-9 3.2.10 SCANNER OPTICS UNIT ............................................................3-10

G422 ii SM

Reassembling the scanner optics unit ................................................3-11 3.2.11 EXPOSURE LAMP.......................................................................3-12

Installing the exposure lamp ...............................................................3-12 3.2.12 SCANNER MOTOR......................................................................3-13 3.2.13 PSU (POWER SUPPLY UNIT) .....................................................3-14 3.2.14 MAIN CONTROL BOARD ............................................................3-15 3.2.15 NETWORK BOARD AND USB BOARD .......................................3-16

3.3 ADF SKEW ADJUSTMENT.....................................................................3-17 If the right side of the image is down...................................................3-17 If the left side of the image is down.....................................................3-17

TROUBLESHOOTING

4. TROUBLESHOOTING ................................................................. 4-1 4.1 LED FUNCTION MODE ............................................................................4-1

4.1.1 LED FUNCTION TABLE...................................................................4-1 4.1.2 NORMAL MODE...............................................................................4-2 4.1.3 SELF DIAGNOSTIC MODE..............................................................4-3 4.1.4 BLOWN FUSE CONDITIONS ..........................................................4-3

4.2 SC CODES................................................................................................4-4 SERVICE TABLES

5. SERVICE TABLES....................................................................... 5-1 5.1 DIP SWITCH FUNCTION..........................................................................5-1 5.2 SERVICE PROGRAM MODE....................................................................5-1

5.2.1 SP MODE DESCRIPTION................................................................5-1 Entering the service mode ....................................................................5-1

5.2.2 FIRMWARE UPDATE.......................................................................5-4 Scanner firmware update......................................................................5-4 Network firmware update ......................................................................5-5

5.2.3 BACKUP AND RESTORE SD CARD...............................................5-6 Backup SD card procedure...................................................................5-6 Restore SD card procedure ..................................................................5-6

DETAILED DESCRIPTIONS

6. DETAILED SECTION DESCRIPTIONS ....................................... 6-1 6.1 MACHINE OVERVIEW..............................................................................6-1 6.2 DRIVE MECHANISM.................................................................................6-2

ADF drive..............................................................................................6-2 Scanner drive........................................................................................6-2

6.3 BLOCK DIAGRAM.....................................................................................6-3 6.4 CONTROL SYSTEM .................................................................................6-4

MCB......................................................................................................6-4 Network board ......................................................................................6-5

6.5 SCANNING OVERVIEW ...........................................................................6-6

SM iii G422

Initializing ..............................................................................................6-6 Scanning...............................................................................................6-6

6.6 DETAILED FUNCTIONS ...........................................................................6-7 6.6.1 PICK-UP AND SEPARATION ..........................................................6-7 6.6.2 ORIGINAL TRANSPORT AND EXIT ................................................6-8

Single–sided originals ...........................................................................6-8 Double-sided originals ..........................................................................6-9

6.7 IMAGE PROCESSING ............................................................................6-10 6.7.1 OVERVIEW ....................................................................................6-10 6.7.2 IMAGE PROCESSING IN THE SBU ..............................................6-11 6.7.3 IMAGE PROCESSING IN THE MCB..............................................6-11

Scan line correction ............................................................................6-12 White level correction..........................................................................6-12 Gamma (γ) correction (Input/Output) ..................................................6-12 Line skipping correction ......................................................................6-12 Mirroring for ADF Mode ......................................................................6-12 Magnification.......................................................................................6-12 Color resolution...................................................................................6-13 Background erase...............................................................................6-13 Auto binary processing .......................................................................6-13 Auto image area separation................................................................6-13 Filtering ...............................................................................................6-13 Scale processing ................................................................................6-14

SPECIFICATIONS

SPECIFICATIONS 1. MAINFRAME..............................................................................................7-1

IMPORTANT SAFETY NOTICES

1. Before disassembling or assembling parts of the scanner and option, make sure that the scanner power cord is unplugged.

2. The wall outlet should be near the scanner and easily accessible. 3. The output voltage of the PSU (Power Supply Unit) can be either 100 ~ 240

Vac, without any adjustment. Make sure that the above voltage is used. 4. The power cord should be an approved type, in accordance with the

regulations for the country in which the scanner is used. 5. The use of cables other than the shield cables or specified equivalents will

invalidate the certification of this scanner and may cause interference levels which exceed the limits established for this equipment.

6. When keeping used lithium batteries in order to dispose of them later, do not put more than 100 batteries per sealed box. Storing larger numbers or not sealing them apart may lead to chemical reactions and heat buildup.

Lithium Batteries (Memory Back-up)

CAUTION The danger of explosion exists if a battery of this type is incorrectly replaced. Replace only with the same or an equivalent type recommended by the manufacturer. Discard used batteries in accordance with the manufacturer’s instructions.

Maintenance Information The operating instructions explain how to use and maintain the scanner. Before performing the maintenance, read the operating instructions.

Warning concerning copyright Many documents are copyrighted. Such documents may not be reproduced by scanning or in any other form without the express permission of the copyright holder.

Notice The contents of this manual are subject to change without notice. This manual uses several symbols.

Symbol What it means

Refer to section number See Core Tech Manual for details Screw Connector E-ring Clip ring

Long Edge Feed (LEF)Short Edge Feed (SEF)

INSTALLATION



TROUBLESHOOTING

SERVICE TABLES


SPECIFICATIONS

TAB

PO

SITI

ON

2

TAB

PO

SITI

ON

1

TAB

PO

SITI

ON

3

TAB

PO

SITI

ON

4

TAB

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SITI

ON

6

TAB

PO

SITI

ON

5

TAB

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SITI

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8

TAB

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7

INSTALLATION

INSTALLATION REQUIRMENTS

SM 1-1 G422

Inst

alla

tion 1. INSTALLATION PROCEDURE

1.1 INSTALLATION REQUIRMENTS 1.1.1 ENVIRONMENT Use this machine at optimum temperature and moisture.

1.1.2 MACHINE LEVEL

Front to back within ±5 mm (0.2") of level

Right to left ±5 mm (0.2") of level

1.1.3 MINIMUM SPACE REQUIRMENTS Right clearance : Over 95.4 mm (3.82") Left clearance : Over 33.8 mm (1.35") Back side clearance : Over 166.6 mm (6.66") Top clearance : Over 530 mm (21.2")

1.1.4 POWER REQUIRMENTS

CAUTION 1. Make sure the plug is firmly inserted in the outlet 2. Avoid multi-wiring. 3. Be sure to ground the machine.

Input Voltage: AC 100V-240V, 1.2 A, 50 to 60Hz Do not put objects on the power cord.

100

80

60

40

20

10 20 30 40

Moi

stur

e [%

]

Temperature [ºC]

32.5ºC 20%

32.5ºC 80%

30ºC 80%10ºC 80%

15ºC 20%10ºC 20% 30ºC 20%

15ºC 80%

: Optimum temperature and moisture range

G422I001.WMF

MAINFRAME AND OPTION INSTALLATION PROCEDURES

G422 1-2 SM

1.2 MAINFRAME AND OPTION INSTALLATION PROCEDURES

1.2.1 MAINFRAME

Accessory check NOTE: NA: North America. EU: Europe.

NA EU Product code G422-17 G422-27 USB Card Yes Yes USB Cable Yes Yes Keyboard Yes Yes Power Cable Yes Yes (C Type) Quick Installation Guide Yes Yes Safety instruction sheet (19 languages) No Yes Registration Card No No Warranty Card No No Help Desk Card No No

Operating Instruction Yes Yes Scanner reference Yes Yes TWAIN Driver (7 languages) Yes ( NOTE) Yes ( NOTE) DeskTopBinder V2 Light (14 languages) Yes Yes DeskTopBinder V2 Light Manual (PDF file, 7 languages) Yes Yes

CD-ROM

Smart Net Monitor for Admin Smart Net Monitor for Client (14 languages)

Yes Yes

NOTE: The TWAIN driver will be generic.

Installation procedure Refer to the G422 Operating Instructions for mainframe installation details.


SM 1-3 G422

Inst

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tion 1.2.2 RACK: G822-17 (OPTION)

ACCESSORY CHECK Check the accessories and their quantities against this list: Description Quantity

1. Lower Stand............................................................................ 2 2. Upper stand ............................................................................ 2 3. Table Board ............................................................................ 1 4. Cross Bar................................................................................ 3 5. Baseboard .............................................................................. 1 6. Tray ........................................................................................ 1 7. Plastic Bag............................................................................... 3 8. Trap ......................................................................................... 1 9. Screw Driver ........................................................................... 1 10. Stepped Screw ....................................................................... 4 11. Screw（M5×10W） ................................................................ 4 12. Screw（M4×8W） ................................................................ 18 13. Cable Strap.............................................................................. 2 14. Screw（M6×10W） ................................................................ 2 15. Handle .................................................................................... 1 16. Clip ......................................................................................... 2 17. Adjuster Screw........................................................................ 4


G422 1-4 SM

Installation procedure Assembling the Rack

1. Insert the upper stand [B] into the lower stand [A] as shown. Important Insert the upper stand [B] into the lower stand [A] till the two screw holes are correctly aligned.

2. Insert the adjuster screws ( x 2) [C] into the 2 screw holes [D] on the bottom of the stand. Important Secure the adjuster screws till the stand is 2 ¾”(65-67mm) from the floor. NOTE: To set the stand to 2 ¾”

(65-67mm) above the floor, turn in the adjuster screw until it is tightly secured. Then turn it 1 or 2 turns.

3. Insert the M5x10W screws ( x 2) [E] to the 2 screw holes [F] at the connection of upper and lower stand.

NOTE: Use the screwdriver (that

comes with the Rack) when you assemble the rack.

4. Do steps 1 to 3 again to put the adjuster screws ( x 2) into the remaining holes on the bottom of the stand.

G422I201.WMF

65-67mm

G422I212.WMF

G422I213.WMF

[A] [B]

[C][D]

[E]

[F]


SM 1-5 G422

Inst

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5. Put the stands parallel to each other.

6. Set the two cross bars [A] on

the stands. Then secure them with M4x8W screws ( x 8).

7. Put the rack in the upright position so that the adjuster screws [C] are on the floor.

G422I230.WMF

G422I204.WMF

[A]

[A]

[C]


G422 1-6 SM

8. Set the cross bar [A] on the end of the lower stand. Then secure them with M4x8W screws ( x 4).

NOTE: Turn the adjuster screws [B] to

adjust the rack to level. 9. Set the table board [C] from above the rack 10. Secure the rack with table board [C]. Insert

the M4×8W screws ( x 6) to the screw holes on the back of the table board.

NOTE: Change the height of the table board [C] by securing the screw holes on the front side of the stand. There are 8 screw holes to adjust the height of the table board.

G422I214.WMF

G422I205.WMF

G422I206.WMF

G422I215.WMF

[A][B][B]

[C]

[C]

[C]


SM 1-7 G422

Inst

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11. Secure the handle [A] to the baseboard [B] with the M6×10W screws ( x 2).

12. Set the baseboard [C]

with the wheels on the floor. Align the stand [D] and the cutout of the baseboard. Then slide the baseboard onto the rack as shown. Important Slide the baseboard [C] onto the rack until the holes [E] on the baseboard and the screw holes [F] on the rack are correctly aligned.

G422I208.WMF

G422I216.WMF

[A]

[B]

[C]

[D]

[E][F]

[C]

[E]

[C]

[F]


G422 1-8 SM

13. Insert the stepped screws ( x 2) into the holes [A] on the baseboard. Then secure them to the screw holes [B] on the rack. Important Secure the stepped screws to the screw hole [B] on the Rack until the screw does not turn. Make sure that the Stepped Screws are fully through the holes [A] on the baseboard. NOTE: Keep the baseboard to the position where you have secured the

stepped screw to the screw hole [B] on the rack.

14. Set the scanner on the table board [C].

NOTE: Set the scanner so that the legs of the scanner fit the dents [D] on the table board.

15. Secure the scanner with the stepped screws ( x 2) into the screw holes [E].

G422I217.WMF

G422I218.WMF

[A]

[A]

[B]

[C]

[D]

[D][E]


SM 1-9 G422

Inst

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16. Insert the tray [A] to the table board [B] as shown.

NOTE: Insert the tray to the

table board till the holes [C] on both sides of the tray and the holes [D] on both sides of the table board are correctly lined.

17. Insert the clips to the holes [D] on both sides of the table board. Then secure the tray [A] with the table board [B]. NOTE: Put in the tray to the position where you have inserted the clips.

18. Put through the keyboard

cables for the scanner between the table board [E] and the tray [F] from the front side to the back of the tray.

19. Set the keyboard for the scanner on the tray [G] then slide in the tray.

G422I219.WMF

G422I220.WMF

G422I221.WMF

[A]

[B]

[C]

[D]

[D]

[G]

[E]

[F]


G422 1-10 SM

20. Set the printer on the baseboard [A]. 21. Slide the baseboard in, as shown. 22. Turn the baseboard wheels to the outside, and

lock them.

G422I222.WMF

G422I223.WMF

G422I224.WMF

[A]


SM 1-11 G422

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23. Insert the cable strap [A] into the hole on the back of the scanner rack.

NOTE: There are 3 holes [B] for the cable strap on

the back of the scanner rack. Insert the cable strap into the hole where the cables easily fit.

24. Set the Cables. 25. Bind the cables with the cable strap [C].

This completes assembly of the scanner Rack.

G422I225.WMF

G422I226.WMF

G422I227.WMF

[A]

[B]

[C]


G422 1-12 SM

Moving the Printer

The printer can be moved using the baseboard [A].

1. Release the stoppers of the wheels. 2. Pull out the baseboard until you see the stepped screws, from the holes of the

baseboard. 3. Remove the stepped screws to fully pull out the baseboard.

G422I228.WMF

G422I229.WMF [A]


USER MAINTENANCE

SM 2-1 G422

Prev

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2. PREVENTIVE MAINTENANCE SCHEDULE 2.1 USER MAINTENANCE Clean these parts at every EM. Abbreviations: Clean, Replace, Emergency Maintenance

Item 90 K EM Remarks Pick-up roller R C Wipe with a wet cloth (alcohol or water). Feed roller R C Wipe with a wet cloth (alcohol or water). Separation pad R C Wipe with a wet cloth (alcohol or water).

The above parts are supplied as “Scanner Maintenance Kit Type 200 (G823-17)”. For details, refer to the G422 Operating Instructions.


SPECIAL TOOLS

SM 3-1 G422

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3. REPLACEMENT AND ADJUSTMENT CAUTION Turn off the main power switch and disconnect the machine’s power cord before you do the procedures in this section.

3.1 SPECIAL TOOLS Part number Description Qty

G4049005 RS-13 Chart (A4) 1 B6455010 SD Card 1 B6456800 USB Reader/ Writer 1

3.2 REPLACEMENT 3.2.1 FEED UNIT

Open the ADF cover [A]. Open the feed unit cover [B]. [A]: Feed unit

G422R101.WMF

[A]

[B]

[C]

REPLACEMENT

G422 3-2 SM

3.2.2 SEPARATION PAD

Open the ADF cover. Open the original guide plate [A]. [B]: Separation pad

3.2.3 ADF REAR COVER

Open the ADF cover. [A]: ADF rear cover ( x 1) NOTE: 1) Release the fastener [B] after you remove the screw.

2) The mylar hinge [C] easily comes off when you remove the ADF cover. If it comes off, attach it again.

G422R102.WMF

G422R103.WMF

[B]

[A]

[B]

[C]

[A]

REPLACEMENT

SM 3-3 G422

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3.2.4 ORIGINAL SET AND REGISTRATION SENSORS

Open the ADF cover. Release the fasteners [A] [B]: ADF top cover [B]: Registration sensor ( x 1) [C]: Original set sensor ( x 1)

G422R123.WMF

[A] [B]

[C]

[D]

REPLACEMENT

G422 3-4 SM

3.2.5 READ AND EXIT SENSORS

ADF top cover ( 3.2.4) [A]: ADF rear cover ( x 1) [B]: ADF front cover ( x 1) [C]: Original tray [D]: ADF transport unit ( x 8, x 2) Remove the read sensor unit [E] ( x 1) [F]: Read sensor Remove the exit sensor unit [G]. ( x 2, x 1) [H]: Exit sensor

G422R125.WMF

G422R126.WMF

G422R124.WMF

[A]

[B]

[D]

[C]

[E]

[F]

[G]

[H]

REPLACEMENT

SM 3-5 G422

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3.2.6 ADF WHITE PLATE

Open the ADF. [A]: ADF white plate (spring x 2)

Installing the ADF white plate Make sure that the white mylar [B] is put inside the guide [C]. If the white mylar is not put inside the guide, it can cause original misfeeds.

G422R122.WMF

[A]

[B]

[C]

REPLACEMENT

G422 3-6 SM

3.2.7 FEED MOTOR AND TRANSPORT MOTOR

ADF rear cover ( 3.2.3)

Feed motor Remove the feed motor unit. ( x 3, long spring x 1, x 1) [A]: Feed motor ( x 2)

NOTE: First remove the spring.

Transport motor Remove the transport motor unit. ( x 3, spring x 1) [B]: Transport motor ( x 2)

NOTE: First remove the spring.

Attaching the feed and transport motor Make sure that each motor's pulley holds the timing belt. 1. Attach the screws loosely. 2. Install the spring.

3. Check if the pulley turns smoothly. 4. Attach the screws tightly.

G422R104.WMF

[A]

[B]

REPLACEMENT

SM 3-7 G422

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3.2.8 SCANNER TOP COVER

[A]: ADF ( x 2)

NOTE: When removing the ADF, place it in the platen face up. [B]: Operation panel ( x 2, x 2)

G422R106.WMF

G422R105.WMF

[B]

[A]

REPLACEMENT

G422 3-8 SM

[A]: Operation panel lower cover ( x 3) [B]: Scanner front cover ( x 2)

NOTE: To remove the scanner front cover, pull up "1" and pull to the side at the left or right ("2").

[C]: Scanner top cover ( x 4)

G422R107.WMF

G422R108.WMF

[A]

[B]

1

2

2[C]

REPLACEMENT

SM 3-9 G422

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3.2.9 EXPOSURE GLASSES

Scanner top cover ( 3.2.8) [A]: Scanner exposure glass ( x 13) [B]: ADF exposure glass ( x 6)

G422R109.WMF

[A]

[B]

REPLACEMENT

G422 3-10 SM

3.2.10 SCANNER OPTICS UNIT

NOTE: Do not touch the scanner optics unit shaft [G] with your bare hands. This can cause rust and incorrect movement. If you touch the shaft with your bare hands, clean the shaft with a cloth and alcohol.

1. Scanner top cover ( 3.2.8) 2. Disconnect the lamp cable [A]. ( x 1, x 1) 3. Cable holder [B] ( x 1) 4. Disconnect the flat cable [C]. 5. Move the scanner optics unit to the notch [D] with the timing belt.

NOTE: Do not push the scanner optics unit directly when you move it. This can cause damage to the shaft and scratches on the rail [I].

6. Loosen the screw of the tension bracket [E]. 7. Move the tension bracket in the direction of the arrow, and then tighten the

screw. 8. Release the timing belt [F] for the scanner optics unit. 9. Remove the scanner optics unit shaft [G]. To do this, pull the right side of the

scanner under cover. 10. Scanner optics unit [H]

NOTE: Do not remove the painted screws in the scanner optics unit.

G422R111.WMF

G422R112.WMF

[A]

[B][C]

[D]

[E]

[F] [G]

[H]

[I]

REPLACEMENT

SM 3-11 G422

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Reassembling the scanner optics unit

1. Connect the flat cable [A].

2. Cable holder [B] ( x 1) 3. Make the front edge [C] of the scanner optics unit hold the white part [D] of the

timing belt. 4. Put the scanner optics unit shaft through the hole [E] and attach it to the shaft

supports. 5. Connect the lamp cable. ( 3.2.11 Installing the exposure lamp) 6. Loosen the screw of the tension bracket [F].

NOTE: The tension bracket is automatically adjusted by its spring when you loosen the screw.

7. Tighten the screw of the tension bracket [F]. NOTE: Check if the movement of the scanner optics unit is correct. To do this,

turn the pulley a few times. 8. Clean the scanner optics unit shaft and the rail with a cloth and alcohol.

G422R113.WMF

[A] [B]

[C][D]

[E]

[F]

REPLACEMENT

G422 3-12 SM

3.2.11 EXPOSURE LAMP NOTE: Do not touch the scanner optics unit shaft with your bare hands. This can

cause rust and incorrect movement. If you touch the shaft with your bare hands, clean the shaft with a cloth and alcohol.

Scanner top cover ( 3.2.8) Move the scanner optics unit to the center of its shaft with the timing belt.

NOTE: Do not push the scanner optics unit directly when you move it. This can cause damage to the shaft and scratches on the rail.

[A]: Exposure lamp ( x 3, x 1)

Installing the exposure lamp When you install the exposure lamp, put the mark on the cable at the position [B]. This makes the correct cable buckle for the exposure lamp.

G422R110.WMF

G422R111.WMF

[A]

[B]

REPLACEMENT

SM 3-13 G422

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3.2.12 SCANNER MOTOR NOTE: Do not touch the scanner optics unit shaft with your bare hands. This can

cause rust and incorrect movement. If you touch the shaft with your bare hands, clean the shaft with a cloth and alcohol.

Remove the scanner optics unit shaft [A]. ( 3.2.10) Remove the timing belt for the scanner optics unit from the pulley [B] of the scanner motor unit. [C]: Scanner motor unit ( x 5, x 2) [D]: Scanner motor ( x 2, spring x 2)

NOTE: For how to install the scanner optics unit shaft ( 3.2.10)

G422R114.WMF

G422R115.WMF

[D]

[A]

[B]

[C]

REPLACEMENT

G422 3-14 SM

3.2.13 PSU (POWER SUPPLY UNIT)

Scanner top cover ( 3.2.8) [A]: PSU ( x 6, x 2)

G422R116.WMF

[A]

REPLACEMENT

SM 3-15 G422

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3.2.14 MAIN CONTROL BOARD NOTE: In this procedure, you must turn the scanner upside down. Before you do

this, do the following with "User Tools".

1. Turn on the main power of this machine. 2. Push the "User Tools" key on the operation panel. 3. Select "System Settings" > "16. Prepare Carriage Lock" > "Yes". 4. Push "Exit" after "Preparation Complete. Turn Lock Switch to Lock." shows on

the LCD. 5. Push "Exit" again to go to the ready screen. 6. Lock the scanner optics unit lock switch [A]. 7. Turn off the main power.

8. Turn the scanner upside down after you lock the scanner optics unit. [B]: Main control board plate ( x 5) [C]: Main control board ( x 4, x 9)

NOTE: G422R120.WMF

G422R117.WMF

[A]

[B]

[C]

REPLACEMENT

G422 3-16 SM

3.2.15 NETWORK BOARD AND USB BOARD

• Before removing the network board, do the "Backup SD card " procedure. ( 5.2.3)

• After installing the new network board, do the "Restore SD card " procedure. ( 5.2.3)

Lock the scanner optics unit ( 3.2.14). Then turn the scanner upside down. Main control board plate ( 3.2.14) [A]: Network board plate ( x 4, x 4) [B]: Network board cover ( x 3) [C]: Network board ( x 3, x 2) [D]: USB board ( x 2, x 1) NOTE: Be careful not to break the connector cover [E]. It can break when you

replace parts and assemble the machine.

G422R118.WMF

G422R119.WMF

[A]

[B]

[C][D]

[E]

ADF SKEW ADJUSTMENT

SM 3-17 G422

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3.3 ADF SKEW ADJUSTMENT This adjustment is used for skew that is caused by a mechanical problem in the ADF. Before you do this adjustment, check if the scanned image has skew in book mode. If there is skew in book mode, there could be a different cause.

You can move the adjustment plate [A] to adjust the skew.

If the right side of the image is down

1. Move the screw of the adjustment plate from [B] to [C]. 2. Move the adjustment plate in the direction of the black arrow.

If the left side of the image is down

1. Move the screw of the adjustment plate from [B] to [C]. 2. Move the adjustment plate in the direction of the white arrow.

G422R121.WMF

[A]

[B]

[C]

TROUBLESHOOTING

LED FUNCTION MODE

SM 4-1 G422

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4. TROUBLESHOOTING 4.1 LED FUNCTION MODE 4.1.1 LED FUNCTION TABLE

LEDs Blinking (sec.) Conditions Contents

Power on Alarm On Off

Total blinking cycles

Machine initialization

Overall machine check On On –

Scanning Normal mode On Off – Stand-by Normal mode Blinking Off 0.5 0.5 1 Jam detection Jam* On On – – –

HP sensor error* Blinking Blinking 0.5 0.5 2 CCD ASIC error* Blinking Blinking 0.5 0.5 3 Fan lock error (Scanner) Blinking Blinking 0.5 0.5 4 Fan lock error (ADF) Blinking Blinking 0.5 0.5 5 Exposure lamp error Blinking Blinking 0.5 0.5 6 EEPROM error* Blinking Blinking 0.5 0.5 7 Gain/ Offset adjustment initialization error*

Blinking Blinking 0.5 0.5 8

Flash ROM error Blinking Blinking 0.5 0.5 9 Memory error* Blinking Blinking 0.5 0.5 10

System error detection

System error Blinking Blinking 0.5 0.5 11 Base program running – Blinking Blinking 0.25 0.25 –

On: LED on Blinking: LED blinking Off: LED off

NOTE: 1) The “*”symbols show that these are detected by the self-diagnostic mode.

2) The LED's blinking is repeated until it gets to the ‘total blinking cycles’ number. The LEDs turn off for 2 seconds between blinking cycles.

LED FUNCTION MODE

G422 4-2 SM

4.1.2 NORMAL MODE

First turn off and on the main power when an error occurs. If an error remains after doing that, do the actions in the column of “possible cause”.

Descriptions Conditions Symptoms Possible causes

Fan lock error (Scanner) The fan in the scanner is locked over 200 ms after the fan motor has been activated.

• Defective harness • Defective fan • Defective MCB 1. Check or replace the harness. 2. Replace the fan. 3. Replace the MCB.

Fan lock error (ADF) The fan in the ADF is locked over 200 ms after the fan motor has been activated.

• Defective harness • Defective fan • Defective DF board • Defective MCB 1. Check or replace the harness. 2. Replace the fan. 3. Replace the DF board. 4. Replace the MCB.

Exposure lamp error The exposure lamp does not turn on.

• Defective cable • Defective exposure lamp • Defective lamp stabilizer • Defective MCB 1. Check or replace the cable. 2. Replace the exposure lamp. 3. Replace the lamp stabilizer. 4. Replace the MCB.

Flash ROM error Erasing or writing data to the Flash ROM fails when updating the firmware.

• Defective MCB 1. Replace the MCB.

System error System does not work correctly. (e.g. firmware error)

• Defective firmware 1. Reinstall the firmware.

LED FUNCTION MODE

SM 4-3 G422

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4.1.3 SELF DIAGNOSTIC MODE

This is done only when you turn on the main power of the machine. ( 4.1.1) First turn off and on the main power when an error occurs. If an error remains after doing that, do the actions in the column of “possible cause”.

Descriptions Conditions Symptoms Possible cause

When turning on. The HP sensor does not detect the scanner optics unit.

When scanning.

HP sensor error

The difference between the scanner motor pulse in scanning an original and the one in returning to home position is more than 15 mm.

• Locked scanner optics unit • Defective HP sensor • Defective motor • Defective scanner timing belt

tension • Defective harness

1. Check the carriage lock switch. ( 3.2.11)

2. Replace the HP sensor.

3. Replace the scanner optics unit motor.

4. Check the scanner timing belt tension.

5. Check or replace the harness. Checking the ASIC for the CCD is not done correctly.

CCD ASIC error

The DMA has no capacity for storing the scanning data.

• Defective FFC • Defective SBU • Defective CCD board • Defective MCB 1. Check or replace the FFC. 2. Replace the scanner optics unit. 3. Replace the MCB.

EEPROM error The “BUSY” is flagged over 250 ms after writing to the EEROM.

• Defective MCB 1. Replace the MCB

Gain/ Offset adjustment initialization error

The input level is less than 10 bit when doing the “Gain adjustment”. The input level is less than 10 bit when doing the “Off-set adjustment”.

• Defective exposure lamp • Defective SBU • Defective MCB 1. Replace the exposure lamp. 2. Replace the scanner optics unit. 3. Replace the MCB.

Memory error A mismatch between the scanning data and writing data to the memory happens.

• Defective MCB 1. Replace the MCB.

4.1.4 BLOWN FUSE CONDITIONS

Rating Fuse 100-250 V

Symptom when turning on the main switch

Power supply unit FS1 2.5 A / 250 V No response

SC CODES

G422 4-4 SM

4.2 SC CODES

SC Code Item Definition Possible cause / Trouble shooting

SC4020 Functional problems When the machine detects an impossible recovery error.

• System does not work correctly. (e.g. firmware error)

1. Turn the main power on/off.

2. Replace the MCB. SC4030 Battery voltage error When the battery voltage

is not enough. • Insufficient battery

voltage 1. Turn the main power

on/off. 2. Replace the network

board.

SERVICE TABLES

DIP SWITCH FUNCTION

SM 5-1 G422

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5. SERVICE TABLES 5.1 DIP SWITCH FUNCTION These switches are on the MCB inside the mainframe. Normally, these are not used in the field.

SW No. Function Setting Default 1 Boot Mode DFU OFF 2 PCB Production Type DFU OFF 3 Not Used – OFF 4 RTC Backup Battery ON: Uses Battery

OFF: Does Not Use Battery

ON

5.2 SERVICE PROGRAM MODE 5.2.1 SP MODE DESCRIPTION

Entering the service mode Push the button.

Push the button.

Push the button.

Push the button.

Hold the button down for three seconds.

Class SP number Description Function

001 FTP port Sets the FTP port number.

002

Version Displays the network firmware version. NOTE: To check the scanner firmware

version with “Web Status Monitor” or “Web Image Monitor”.

003 Lot No. Displays the machine lot number. 004 Error log Displays the service call number (SC).

005 Initialize SCAN-data Initializes all SP mode data except for the network data.

006 Initialize all data Initializes all SP mode data (this SP has

the same effect as 1-005 and 1-007 combined).

007 Initialize SCAN-NIC Data Data related to the network is initialized. 008 Density Setup 1 Adjusts Density 1. [0-255/40/1] 009 Density Setup 2 Adjusts Density 2. [0-255/70/1] 010 Density Setup 3 Adjusts Density 3. [0-255/100/1] 011 Density Setup 4 Adjusts Density 4. [0-255/130/1]

1

012 Density Setup 5 Adjusts Density 5. [0-255/160/1]

SERVICE PROGRAM MODE

G422 5-2 SM

Class SP number Description Function

013 Density Setup 6 Adjusts Density 6. [0-255/190/1] 014 Density Setup 7 Adjusts Density 7. [0-255/220/1] 015 Flash ROM disc format Formats the flash ROM 016 Binary color Selects binary color [Yes or No/No]

017

Backup SD Card Downloads the following settings to the SD Card. • Basic settings • File send settings • Email settings • Delivery settings • Print scan settings

018 Restore SD Card Uploads the above settings from the SD Card to the machine.

019

JAM Information Displays the jam location and counter. For example: “Code:0x04 Total:38” means that jams have been detected 38 times at the registration sensor. NOTE: The following codes are displayed

on the operation panel. 0x01: ADF cover open 0x02: ADF open 0x03: Pick-up jam 0x04: Registration sensor (paper did not come) 0x84: Registration sensor (paper stayed) 0x05: Read sensor (paper did not come) 0x85: Read sensor (paper stayed) 0x06: Exit sensor (paper did not come) 0x86: Exit sensor (paper stayed)

020 Firmware Update Updates the firmware

021 Scanner Test (ADF) Executes the scanner test for ADF mode (simplex mode only)

1

022 Scanner Test (Scanner) Executes the scanner test for Flat Bed mode

NOTE: The setting range is in brackets and the default setting is in bold.


SM 5-3 G422

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SP 1-008 to 014: Density setup examples These values control the image density for the 7 settings on the operation panel. Here are three examples Case 1: There is a relatively small difference between the minimum and maximum

settings Case 2: The higher values in this example make the image lighter. Case 3: The lower values in this example make the image darker.

Case Density setup 1

Density setup 2

Density setup 3

Density setup 4

Density setup 5

Density setup 6

Density setup 7

1 85 100 115 130 145 160 175 2 70 100 130 160 190 220 250 3 10 40 70 100 130 160 190

NOTE: These are reference values. Adjust them to get the best results.


G422 5-4 SM

5.2.2 FIRMWARE UPDATE

This machine has these two firmware types: • Scanner firmware • Network firmware

NOTE: 1) You can keep both firmware programs on the same SD card. 2) Do not put firmware programs from another machine on the SD card

you will use for this machine. You cannot mix multiple machine firmware programs on the same SD card.

3) You do not need to create a root directory when you update the firmware for this machine.

Scanner firmware update NOTE: Before you do this procedure, prepare an SD card that contains the

required firmware. 1. Turn off the main power of the machine. 2. Install the SD card that contains the required firmware into the SD card slot [A]. 3. Enter the SP mode ( 5.2.1), and then select SP 1-020 (Firmware Update).

4. Press “Setting” and then press three times consecutively to update the scanner firmware.

5. “Under execution. Please wait.” appears on the operation panel. NOTE: If “error: Check the SD Card.” appears on the operation panel, check

the SD Card. 6. After completing the scanner firmware update, turn off the main power and

remove the SD card from the SD card slot [A]. 7. Turn it on again.

G422S107.WMF

[A]


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Network firmware update

Before you do this procedure, prepare an SD card that contains the required firmware.

1. Turn off the main power of the machine. 2. Do the “Backup SD card” procedure. ( 5.2.3 Backup SD card procedure) 3. Install the SD card, which contains the required firmware, into the SD card slot

[A].

4. Turn on the main power of the mainframe while holding down the , and keys together.

5. When “START” is displayed, press the Start button. 6. Follow the procedure displayed on the operation panel to update the network

firmware. NOTE: “Upgrading complete” is displayed after completing this update

correctly. 7. Turn off the main power, and then remove the SD card. 8. Do the “Restore SD card” procedure. ( 5.2.3 Restore SD card procedure)

G422S108.WMF[A]


G422 5-6 SM

5.2.3 BACKUP AND RESTORE SD CARD

Backup SD card procedure

1. Turn off the main power. 2. Install an SD card, which does not have any data, into the SD card slot [A]. 3. Turn on the main power. 4. Enter the SP mode ( 5.2.1), and then select SP1-017 (Backup SD Card).

5. Press three times consecutively to download the setting data from the mainframe to the SD card.

6. After completing the setting data backup, turn off the main power, and then remove the SD card from the SD card slot.

Restore SD card procedure

1. Turn on the main power. 2. Install the SD card, which was used in “Backup SD card”, into the SD card slot

[A] again. 3. Turn on the main power. 4. Enter the SP mode ( 5.2.1), and then select SP1-018 (Restore SD Card)

5. Press three times consecutively to upload the setting data from the SD card to the mainframe.

6. After completing the setting data restore, turn off the main power, and then remove the SD card from the SD card slot.

G422D107.WMF

[A]


MACHINE OVERVIEW

6. DETAILED SECTION DESCRIPTIONS 6.1 MACHINE OVERVIEW

G422D101.WMF

[S]

[K]

[Q]

[R]

[P]

[O] [N] [M] [L] [J]

[I]

[H]

[G][F]

[E] [D] [C] [B] [A]

[A]: Registration roller [B]: Registration sensor [C]: Separation pad [D]: Feed roller [E]: Pick-up roller [F]: Original set sensor [G]: Exit roller [H]: Scanner exposure glass [I]: Exposure lamp

[J]: Scanner optics unit [K]: Junction gate [L]: Exit sensor [M]: Scanner motor [N]: Second transport roller [O]: Home position sensor [P]: PSU fan [Q]: ADF exposure glass [R]: Read sensor [S]: First transport roller

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SM 6-1 G422

DRIVE MECHANISM

6.2 DRIVE MECHANISM ADF drive

G422D105.WMF[H]

[G]

[F]

[E]

[D] [B][A]

[C]

Feed motor [A]: Controls the pick-up roller [B], feed roller [C], and registration

roller [E]. Transport motor [D]: Controls the first transport roller [F], second transport roller

[G], and exit roller [H]

Scanner drive

G422D106.WMF

[D]

[C][B]

[A] Scanner motor [A]: Controls the scanner optics unit [D] through the

pulley [B], and the scanner optics unit timing belt [C].

G422 6-2 SM

BLOCK DIAGRAM

6.3 BLOCK DIAGRAM

Main Baord

PSU

NetworkBoard

Operation PanelBoard

USB Baord

Home PositionSensor

SBU

ADF

Motor/Fan

Exposure Lamp

Lamp Stabilizer

G422D500.WMF

The MCB (Main Controller Board) controls this machine. Its CPU checks all sensors and controls the ADF, all motors/fans, and the USB board. It also processes images from the SBU. The Network board controls the PCMCIA interface (I/F), SD Card I/F, Ethernet I/F, user interface (operation panel) and passes the image data from the MCB to the necessary I/F.

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SM 6-3 G422

CONTROL SYSTEM

6.4 CONTROL SYSTEM

MCB

Motor Drivers

CPU

Gate Array LVDS SDRAM

(128MB)

EEPROM

MotorDrivers

PROMFlash ROMSCSI-2 Controller

Local BUS

ADF Motor/Fan SBU

USB Network Control Board

Main Board

G422D501.WMF

• LVDS (Low Voltage Differential Signaling): This IC gets digital data from the SBU, and converts it from parallel to serial.

• SDRAM: This is the main memory for data. (256MB x 4)

• EEPROM This stores scanning adjustment values and counter data. The data stored in this ROM is not erased if the main power is turned off. (128B)

• Flash ROM This contains the scanner firmware. (1MB)

G422 6-4 SM

CONTROL SYSTEM

Network board

CPU

EEPROM(256 kb)

MCB

Network Board

LANController

PC CardController

PC I BUS

LCDController

FROM(32 MB)

SDRAM(128 MB)

Local BUS

I/O Port

Operation Panel Board

SD CardI/F

PCMCIAI/F

EthernetI/F

G422D502.WMF

• FROM (Flash ROM): This stores scanner firmware, mail address and IP address data.

• SDRAM: This stores scanning image data.

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• EEPROM: This stores network controller settings such as MAC address and FTP port numbers.

SM 6-5 G422

SCANNING OVERVIEW

6.5 SCANNING OVERVIEW

G422D102.WMF

[E][D]

[C] [B]

[A]

Initializing • The exposure lamp [A] (a xenon lamp in this model) illuminates the original. The

image is reflected onto a CCD [B] (charge coupled device) via several mirrors, and through the lenses.

• When you turn on the machine’s main power, the scanner optics unit moves to the home position sensor [C]. After the HP sensor detects the scanner optics unit, the scanner moves under the white plate [E] (this is the home position of the scanner optics unit).

• If the scanner home position sensor is not activated within a certain time, a home position sensor error will occur.

Scanning Platen mode • When the machine receives a job command, the scanner optics unit scans the

white plate [E] and then an original. • After scanning an original, the scanner optics unit moves to the HP sensor [C]. • The scanner optics unit stops at the home position after the HP sensor detects it.

ADF mode • The scanner optics unit scans the white plate [E] and then moves back to the

ADF exposure glass [D]. • The scanner optics unit stops to scan an original under the ADF exposure glass. • After scanning an original, the scanner optics unit moves to the HP sensor [C]. • The scanner optics unit stops at the home position after the HP sensor detects it.

G422 6-6 SM

DETAILED FUNCTIONS

6.6 DETAILED FUNCTIONS 6.6.1 PICK-UP AND SEPARATION

G422D108.WMF

[E]

[D]

[C]

[A]

G422D109.WMF

[F]

[E]

[D]

[B]

• The originals push the actuator [A]. Then the original set sensor [B] turns on.

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• After you push the start button, the feed motor [C] starts to turn. It pushes the pick-up roller [D] down to the original. (The feed motor drives the pick-up roller through the feed roller [E].) Then the pick-up roller [D] feeds the original to the separation pad [F].

• The separation pad [F] lets one sheet of the originals go into the scanner.

SM 6-7 G422

DETAILED FUNCTIONS

6.6.2 ORIGINAL TRANSPORT AND EXIT

Single–sided originals

G422D103.WMF

[E] [D][C]

[B] [A]

• The feed motor feeds the separated page of the original to the registration roller

[A]. • The registration sensor [B] detects the page. Then the registration roller corrects

original skew. • The feed motor turns in the opposite direction to drive the registration roller, and

the transport motor turns on. • The registration roller, first transport roller [C], second transport roller [D] and the

exit roller [E] feed the original to the exit tray.

G422 6-8 SM

DETAILED FUNCTIONS

Double-sided originals – Front side – • An original is fed to the exit sensor in

the same manner as for the single-sided scanning mode.

G422D103.WMF

– Rear side –

G422D104.WMF

[D]

[I] [H]

[G]

[C]

[B]

[A]

• When the exit sensor [A]

detects the trailing edge of an original, the exit roller [C] turns in reverse.

[E]

• The junction gate [B] closes because of its weight after the original goes past it.

[F]• Because of this, when the exit

roller feeds the original, it goes up to the registration roller.

• After skew is corrected, the roller [G] is pulled away from the exit roller [C] by the exit roller release solenoid.

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• The roller [G] is moved into contact with the exit roller [C] again by the exit roller release solenoid when the read sensor [I] detects the trailing edge of the original.

• When the exit sensor [H] detects the trailing edge of the original, the original is sent again to the exit tray through the scanner, past the registration roller [D], first [E], second transport roller [F] and exit roller [C] without scanning at this time.

• This ensures that the original will be correctly stacked front side down in the exit tray.

SM 6-9 G422

IMAGE PROCESSING

6.7 IMAGE PROCESSING 6.7.1 OVERVIEW

CPU

Multiplexer

CCD CLKDriver IC

R

G

B

B/W

LVDS

SBU

Analog Data (R)

Analog Data (G)

Analog Data (B)

CCDAnalog Front End

Digital Data

DATA/HSYNC

Digital Data

LVDSDATA 10bit

ImageProcessing

Main ControlCPUDMA

InterfaceHi-speed USB

USB

Main Control Board

NetworkBoard

LAN

SDRAM 256MB x 4

Digital Data

A/DConverter

A/DConverter

A/DConverter

Controller

G422D900.WMF

• The CCD generates three analog video signals. • The AFE (Analog Front End processor) on the SBU (Sensor Board Unit) converts

these analog signals to 10-bit digital signals. • It sends these digital signals to the MCB (Main Control Board) board through the

LVDS (Low Voltage Differential Signaling). • The CPU on the MCB processes the image, and then the image data is sent to

the network or to a local printer through the NIB or the SCSI-2 controller.

G422 6-10 SM

IMAGE PROCESSING

6.7.2 IMAGE PROCESSING IN THE SBU

The CCD converts the light reflected from the original into an analog signal. Each analog signal is transmitted to the analog front end IC.

The analog front end IC does the following operations. 1. Z/C (Zero Clamp)

Adjusts the black level reference for even-numbered pixels to match the odd-numbered pixels.

2. Signal Amplification Operational amplifiers in the AGC (Auto Gain Control) circuit amplify the analog signal. The CPU on the MCB board controls the maximum gain.

After the above processes, the analog signals are converted to 10-bit digital signals by the A/D converters. The shading function corrects these signals. Shading correction prevents uneven images caused by fluctuations in scanned data due to changes in light intensity and CCD sensitivity. 6.7.3 IMAGE PROCESSING IN THE MCB

The CPU on the MCB is the image processor. It does the following:

1. Scan line correction 2. White level correction 3. Gamma (γ) correction 4. Line skipping correction

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5. Mirroring for ADF Mode 6. Magnification 7. Color resolution 8. Background Erase 9. Auto binary processing 10. Auto image area separation 11. Filtering 12. Scale processing

SM 6-11 G422

IMAGE PROCESSING

Scan line correction The CCD consists of three lines of elements, one for each color (red, green and blue). Since there is a slight gap between the lines, each line is scanning a slightly different part of the image. To produce the final image, these three outputs need to be synchronized. Since the deviation between the lines varies with the scanner speed, a deviance value must be calculated in proportion to the speed.

White level correction The video signal information for each pixel obtained during image scanning is corrected by the image processing circuits. Due to the loss of exposure lamp brightness, less brightness at the edges of the lens and distortions in the light path, the machine scans a white plate before scanning each original. The white plate is uniform in color and in reflection.

Gamma (γ) correction (Input/Output) There should be a linear relationship between the original image density and the CCD output. Gamma correction adjusts for deviations from this ideal. It includes both brightness and contrast corrections.

Line skipping correction Ideally, this machine would scan at a constant speed. However, when the data transfer speed slows down, the scanner optics unit must also slow down to match. If the scanner optics unit must stop to wait on the client or server, duplicate lines may be scanned. These can create a visible seam between the scanned sections. Line skipping correction erases duplicate image lines, ensuring a smooth final image.

Mirroring for ADF Mode When scanning an original using the ADF, the magnification circuit creates a mirror image. This is because the scanning starting position in the main scan direction is at the other end of the scan line in ADF mode (compared with platen mode). Otherwise, a scanned image in book mode differs from ones in ADF mode. This prevents a different image.

Magnification The CPU on the MCB enlarges or reduces the image data in the scan direction. Changing the scanning speed does reduction and enlargement in the sub scan direction.

G422 6-12 SM

IMAGE PROCESSING

Color resolution Because of the differences in color space, the color observed by a person, and the color value sensed by the CCD can vary. Color resolution corrects the color data gathered by the CCD. It uses a color table that adjusts for the way particular colors are displayed on specific CRTs. This allows a more-natural representation of the scanned image. This also changes RGB signals to YMC signals. After adjusting color resolution, this changes YMC signals to RGB signals again.

Background erase Background can be erased with this function using threshold value.

Auto binary processing When making simple binary scans of a light original (e.g. gray text on a white background), the threshold level is adjusted. This allows the lighter shades to appear in the final image.

Auto image area separation When a scanned document contains text and photo areas, the machine searches for the outlines of the text. Based on these outlines, it separates the image into text and photo areas. Text areas use simple binary processing. Photo areas use dithering and error diffusion.

Filtering There are two software filters: the MTF (Modulation Transfer Function) filter and the smoothing filter. The MTF filter emphasizes sharpness, and is used with documents that contain both text and photo areas. The smoothing filter is only used for photo-image documents.

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SM 6-13 G422

IMAGE PROCESSING

G422 6-14 SM

Scale processing This process generates image densities of up to 256 levels for each pixel. It uses simple binary, dithering, and error diffusion processing. Simple binary processing sets the level based on a threshold value. There are no shades of gray. The output is black or white only. Dither processing is used to reproduce originals with continuous tones, such as photographs on machines that cannot output true grayscales. It produces different shades of gray by creating patterns of black and white dots. There are no gray dots. The error diffusion process reduces the difference in contrast between light and dark areas of a halftone image. Each pixel is corrected using the difference between it and the surrounding pixels. The corrected pixels are then compared with a matrix table. Error diffusion is often used in text/photo mode. It is a good compromise because it reduces the contrast between light and dark areas of halftone images, while having no effect on letter areas.

SPECIFICATIONS

SPECIFICATIONS

SM 7-1 G422

Spec

ifica

tions

SPECIFICATIONS 1. MAINFRAME Scanning method: Flat-bed color scanner with ADF Book scan: Horizontal: Max. 216 mm [8.5"]

Min. 5 mm [0.2"] Vertical: Max. 297 mm [11.7"]

Min. 5 mm [0.2"] Document weight: 60 - 105 g/m2 (16 ~ 28 lb)

ADF: Document size: Width: 140 ~ 215.9 mm [5.5" ~ 8.5"] Length: 140 ~ 2,000 mm [5.6" ~ 80"] (Duplex: 355.6 mm [14.2"])

Document weight: 60 - 105 g/m2 (16 ~ 28 lb) ADF capacity:

50 sheets (75 g/m2, 20 lb) Stack capacity:

50 sheets (75 g/m2, 20 lb) Scanning resolution: Main scan: 600 dpi

Sub scan: 600 dpi Grayscales: Input: 10 bits/pixel (for each color)

Output: 8 bits/pixel Initialization time: Approximately 43 seconds or less with USB card

(Approximately 40 seconds or less without USB card) Scanning speed: Simplex mode

B&W: 33 ppm/200 dpi Color: 16 ppm/200 dpi (A4SEF)

Duplex mode B&W: 14 ipm/200 dpi Color: 9 ipm/200 dpi (A4SEF) (Counted from the second page)

Interface:

USB 2.0 (for keyboard input), 10/100 BASE-TX

(Standard, for network connection) USB 2.0, 10/100 BASE-TX (Standard for connection

to a printer) SD card slot (Standard)

SPECIFICATIONS

G422 7-2 SM

Power: NA: AC 120 V / 1.2A (60 Hz) EU: AC 220 - 240 V / 1.2A (50 Hz/ 60 Hz)

Power consumption (without all possible options):

Standby: 12 W or less Scanning: 96 W ± 15% (NA) 93 W ± 15% (EU) Low power mode: 6 W or less

Operating environment: Temperature: 10 to 32.5°C [50 to 90.5°F] Humidity: 20 to 80% RH

Weight: 13.5 kg (29.7 lb) Dimensions (W x D x H): 448 x 486.3 x 194.3 mm [17.6" x 19.1" x 7.6"]

Documents

G422_SM