Epson ET-4750, ET-4760, L6190, ST-4000, ET-3750 Service Manual

...

Service Manual

Color Inkjet Printer

EPSON

ET-4750/ET-4760/L6190/ST-4000 series ET-3750/ET-3760/L6170/ST-3000 series ET-3700/ET-3710/L6160 series ET-2750/ET-2760/L4160/ST-2000 series ET-2700/L4150 series

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SEMF17-003

Notice

recording, or otherwise, without the prior written permission of SEIKO EPSON CORPORATION.

 All effort have been made to ensure the accuracy of the contents of this manual. However, should any errors be detected, SEIKO EPSON would greatly appreciate being

informed of them.

 The contents of this manual are subject to change without notice.

 The above not withstanding SEIKO EPSON CORPORATION can assume no responsibility for any errors in this manual or the consequences thereof.

EPSON is a registered trademark of SEIKO EPSON CORPORATION.

Notice: Other product names used herein are for identification purpose only and may be trademarks or registered trademarks of their respective owners.

EPSON disclaims any and all rights in those marks.

PQuality Assurance Department

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Safety Precautions

All safety procedures described here shall be strictly adhered to by all parties servicing and maintaining this product.

DANGER

Strictly observe the following cautions. Failure to comply could result in serious bodily injury or loss of life.

1. Always disconnect the product from the power source and peripheral devices when servicing the product or performing maintenance.

2. When performing works described in this manual, do not connect to a power source until instructed to do so. Connecting to a power source causes high voltage in the power supply unit and some electronic components even if the product power switch is off. If you need to perform the work with the power cable connected to a power source, use extreme caution to avoid electrical shock.

WARNING

Strictly observe the following cautions. Failure to comply may lead to personal injury or loss of life.

1. When using compressed air products; such as air duster, for cleaning during repair and maintenance, the use of such products containing flammable gas is prohibited.

PRECAUTIONS

Strictly observe the following cautions. Failure to comply may lead to personal injury or damage of the product.

1. Repairs on Epson product should be performed only by an Epson certified repair technician.

2. No work should be performed on this product by persons unfamiliar with basic safety knowledge required for electrician.

3. The power rating of this product is indicated on the serial number/rating plate. Never connect this product to the power source whose voltages is different from the rated voltage.

4. Replace malfunctioning components only with those components provided or approved by Epson;  introduction of second-source ICs or other non-approved components may damage the product and void any applicable Epson warranty.

5. The capacitors on the Main Board may be electrically charged right after the power turns off or after driving motors which generates counter electromotive force such as when rotating the PF Roller or when moving the CR Unit. There is a risk to damage the Main Board if the FFC is short-circuited with the capacitors on the Main Board electrically charged, therefore, after the power turns off or after motors are driven, leave the printer untouched for approximately 30 seconds to discharge the capacitors before starting disassembly/ reassembly.

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6. To prevent the circuit boards from short-circuiting, be careful about the following when handling FFC or cables.

 When handling FFC, take care not to let the terminal section of FFC touch metal parts.  When connecting cables/FFC to the connectors on circuit boards, connect them straight to the connectors to avoid slant insertion.

7. In order to protect sensitive microprocessors and circuitry, use static discharge equipment, such as anti-static wrist straps, when accessing internal components.

8. Do not tilt this product immediately after initial ink charge, especially after performing the ink charge several times. Doing so may cause ink to leak from the product because it may take some time for the waste ink pads to completely absorb ink wasted due to the ink charge.

9. Never touch the ink or wasted ink with bare hands. If ink comes into contact with your skin, wash it off with soap and water immediately. If you have a skin irritation, consult a doctor immediately.

10. When disassembling or assembling this product, make sure to wear gloves to avoid injuries from metal parts with sharp edges.

11. Use only recommended tools for disassembling, assembling or adjusting the printer.

12. Observe the specified torque when tightening screws.

13. Be extremely careful not to scratch or contaminate the following parts.

 Nozzle plate of the printhead  CR Scale  PF Scale  Coated surface of the PF Roller  Gears  Rollers  LCD  Scanner Sensor  Exterior parts

14. Never use oil or grease other than those specified in this manual. Use of different types of oil or grease may damage the component or give bad influence on the printer function.

15. Apply the specified amount of grease described in this manual.

16. Make the specified adjustments when you disassemble the printer.

17. When cleaning this product, follow the procedure described in this manual.

18. When transporting this product after filling the ink in the printhead, pack the printer without removing the adapters in order to prevent the printhead from drying out.

19. Make sure to install antivirus software in the computers used for the service support activities.

20. Keep the virus pattern file of antivirus software up-to-date.

21. When disassembling/reassembling this product, if you find adhesive power of the double-sided tape which secure the parts or FFC is not enough, replace the tape with new one and attach it correctly to the specified points where the parts or FFC should be secured.

22. Unless otherwise specified in this manual, the labels attached on the returned product should be transferred to the corresponding attachment positions on the new one referring to the labels on the returned product.

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About This Manual

This manual, consists of the following chapters, is intended for repair service personnel and includes information necessary for properly performing maintenance and servicing the product.

CHAPTER 1. OPERATING PRINCIPLES

Describes the electrical and mechanical basic operating principles of the product.

CHAPTER 2. TROUBLESHOOTING

Describes the step-by-step procedures for the troubleshooting.

CHAPTER 3. DISASSEMBLY/ASSEMBLY

Describes the disassembly/reassembly procedures for main parts/units of the product, and provides the standard operation time for servicing the product.

CHAPTER 4. ADJUSTMENT

Describes the required adjustments for servicing the product.

CHAPTER 5. MAINTENANCE

Describes maintenance items and procedures for servicing the product.

CHAPTER 6. APPENDIX

Provides the following additional information for reference:

• Connector Diagram

• Protection for Transportation

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Symbols Used in this Manual

Various symbols are used throughout this manual either to provide additional information on a specific topic or to warn of possible danger present during a procedure or an action. Pay attention to all symbols when they are used, and always read explanation thoroughly and follow the instructions.



Indicates an operating or maintenance procedure, practice or condition that, if not strictly observed, could result in injury or loss of life.



Indicates an operating or maintenance procedure, practice, or condition that, if not strictly observed, could result in damage to, or destruction of, equipment.



May indicate an operating or maintenance procedure, practice or condition that is necessary to accomplish a task efficiently. It may also provide additional information that is related to a specific subject, or comment on the results achieved through a previous action.

For Chapter 3 “Disassembly/Reassembly”, symbols other than indicated above are used to show additional information for disassembly/reassembly. For the details on those symbols, see

"3.3 Disassembly/Reassembly Procedures (p95) ".

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Revision Status

Revision Date of Issue Description

A Aug. 31, 2017 First release

Revised

 Chapter 3

 Made change in "3.1 Overview (p77) "

• Made change in "3.1.2 Jigs (p77) "

• Made change in "3.1.4 Standard Operation Time for Servicing the Product (p81) "

 Made change in "3.3 Disassembly/Reassembly Procedures (p95) "

• Made change in "3.3.3 Disassembly Flowchart (p97) "

B Feb. 26, 2018

C May. 11, 2018

• Made change in "3.3.4 Repairing Major Components Disassembly/Assembly Procedure (p113) "

 Made change in "3.4 Detailed Disassembly/Reassembly Procedure for each Part/Unit (p142) "  Made change in "3.4 Routing FFCs/cables (p146) "

 Chapter 4

 Made change in "4.3 Mechanism Adjustment / Check (p168) "

• Made change in "4.3.1 Checking the Platen Gap (p168) "

 Chapter 6

 "6.2 Head Fuse (p183) " has been added.

Display Bugs fixes.

 Hyper links have been fixed.

Revised

Add models (ST-2000, ST-3000, ST-4000)

D Sep. 19, 2018

E Mar. 25, 2019

□ Chapter3

■Made change in "3.1.1 Tools (p77) "

■Made change in "3.1.4 Standard Operation Time for Servicing the Product (p81) " ・The Fax outringer box has been deleted.

　■Made change in "3.3.2 Functional differences between models and component parts (p96) "

■Made change in "3.3.3.1 Disassembly/Reassembly Flowchart (ET-4750/ET-4760/L6190/ST-4000 series/ET-3750/ET-

3760/L6170/ST-3000 series/ET-3700/ET-3710/L6160 series) (p98) "

Revised

Add models (ET-4760 series, ET-3760 series, ET-3710 series, ET-2760 series)

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F Apr. 16, 2019

G Jan. 28, 2020

Revised □ Chapter3

■Made change in "3.3.4.7 Main Board (p129) " ・Caution about Heat Conduction sheet has been added.

　■Made change in "3.4 Routing FFCs/cables (p146) " ・" Holder Star Wheel Grounding Cable (ET-4750/ET-4760/L6190/ST-4000 series/ET-3750/ET-3760/L6170/ST-3000

series/ET-3700/ET-3710/L6160 series) (p150) "has been added.

Revised □ Chapter2

■Made change in "2.1.1.3 Workflow for Errors when Printing Starts (p46) " ・Subscription Errors have been added. □ Chapter3

■For ET-2700/L4150 series, Descriptions of Paper Set Detector Sensor Board have been deleted. □ Chapter4

■Made change in "4.1 Required Adjustments (p152) " ・Caution of subscription models has been added.

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H Oct, 09, 2020

I Jul, 15, 2021

Revised □ Chapter2

■Made change in "2.3 Fatal Error Code List (p49) " ・" 060001 (p63) " have been added. □ Chapter3

■Made change in "3.3.3.2 Disassembly/Reassembly Flowchart (ET-2750/ET-2760/L4160/ST-2000 series) (p103) " ・" Porous Pad Ink Eject Lower (p105) " have been added.

■Made change in "3.3.3.3 Disassembly/Reassembly Flowchart (ET-2700/L4150 series) (p108) " ・" Porous Pad Ink Eject Lower (p110) " have been added.

■Made change in "3.4 Detailed Disassembly/Reassembly Procedure for each Part/Unit (p142) " ・" Porous Pad Ink Eject Lower (Only ET-2750/ET-2760/L4160/ST-2000 series/ET-2700/L4150 series) (p144) " have been added.

Revised □Chapter2

■Made change in"2.3.2.7 Printer (Others) (p63) " ・" Paper jam release impossible error (p63) " have been added.

■Made change in"2.3.2.8 System Error (p63) " ・" Panel unit failure (p63) " have been added. ・Firmware bug have been deleted. □Chapter3

■Made change in"3.3.4.6 Print Head (p126) " ・"3-41 Removing the Print Head (p127) " have been modified.

□Chapter4

　■Made change in Table"4-1 (p153) "

・ADF Type Select have been added in Adjustment item. ・ADF Unit have been added in relevant parts.

■Made change in"4.2.2 Adjustment and Inspection List (p156) " ・" ADF Type Select (p158) " have been added.

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EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

Contents

Chapter 1 Operating Principles

1.1 Printer Mechanism Overview ............................................................................. 13

1.1.1 Print Head .................................................................................................. 13

1.1.2 Carriage (CR) Mechanism ......................................................................... 15

1.1.3 Paper Loading/Feed Mechanism ............................................................... 16

1.1.4 Ink System Mechanism .............................................................................. 18

1.1.5 List of Motor and Sensor ........................................................................... 19

1.2 Scanner/ADF Overview ..................................................................................... 21

1.2.1 Scanner Mechanism ................................................................................... 21

1.2.2 ADF Mechanism (ET-4750/ET-4760/L6190/ST-4000 series/ET-3750/ET-

3760/L6170/ST-3000 series only) ............................................................ 21

1.3 Paper Loading/Feed Mechanism ........................................................................ 23

1.3.1 Overview .................................................................................................... 23

1.3.1.1 Paper Loading Method ....................................................................... 23

1.3.1.2 Paper Feed Path .................................................................................. 25

1.3.2 Operation Principle .................................................................................... 27

1.3.2.1 Drive Path ........................................................................................... 27

1.4 Ink System Mechanism ...................................................................................... 34

1.4.1 Overview .................................................................................................... 34

1.4.1.1 Mechanical Configuration .................................................................. 34

1.4.1.2 Cleaning .............................................................................................. 35

1.4.1.3 Controlling Waste Ink ........................................................................ 35

1.4.2 Operating Principles .................................................................................. 36

1.4.2.1 Drive Path ........................................................................................... 36

1.4.2.2 Operation of Each Mechanism ........................................................... 37

Chapter 2 Troubleshooting

2.1 Troubleshooting .................................................................................................. 41

2.1.1 Troubleshooting Workflow ....................................................................... 41

2.1.1.1 Workflow when the Power is ON (Printer) ........................................ 42

2.1.1.2 Workflow for Scanner Errors when the Power is ON ........................ 45

2.1.1.3 Workflow for Errors when Printing Starts ......................................... 46

2.2 Power-On Sequence ........................................................................................... 48

2.3 Fatal Error Code List .......................................................................................... 49

2.3.1 Displaying the Fatal Error Code ................................................................ 49

2.3.2 Fatal Error Code ........................................................................................ 49

2.3.2.1 Scanner ............................................................................................... 50

2.3.2.2 Printer (CR) ........................................................................................ 56

2.3.2.3 Printer (PF) ......................................................................................... 59

2.3.2.4 Printer (PW/PE Sensor) ...................................................................... 61

2.3.2.5 Printer (Power Supply) ....................................................................... 61

2.3.2.6 Printer (Head/CSIC) ........................................................................... 62

2.3.2.7 Printer (Others) ................................................................................... 63

2.3.2.8 System Error ....................................................................................... 63

2.4 Service Support Mode ........................................................................................ 64

2.4.1 Touch Panel 2.4 inch model ...................................................................... 64

2.4.2 LCD Model ................................................................................................ 65

2.4.3 Status Sheet Information ........................................................................... 67

Chapter 3 Disassembly/Assembly

3.1 Overview ............................................................................................................ 77

3.1.1 Tools .......................................................................................................... 77

3.1.2 Jigs ............................................................................................................. 77

3.1.3 Locations of the Parts/Units ...................................................................... 78

3.1.4 Standard Operation Time for Servicing the Product ................................. 81

3.1.5 Checks and Precautions before Disassembling ......................................... 87

3.1.5.1 Factors which Affect the Print Quality .............................................. 87

3.1.5.2 Minimizing Ink Leakage during Disassembly for Your Safety ......... 89

3.1.5.3 Ink Discharging Procedure ................................................................. 92

3.2 Common Cautions on Disassembly/Reassembly ............................................... 93

3.3 Disassembly/Reassembly Procedures ................................................................ 95

3.3.1 Parts/Components Need to be Removed Before Disassembly/Reassembly 95

3.3.2 Functional differences between models and component parts ...... 96

3.3.3 Disassembly Flowchart .............................................................................. 97

3.3.3.1 Disassembly/Reassembly Flowchart (ET-4750/ET-4760/L6190/ST-4000

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EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

series/ET-3750/ET-3760/L6170/ST-3000 series/ET-3700/ET-3710/

L6160 series) ...................................................................................... 98

3.3.3.2 Disassembly/Reassembly Flowchart (ET-2750/ET-2760/L4160/ST-2000

series) ............................................................................................... 103

3.3.3.3 Disassembly/Reassembly Flowchart (ET-2700/L4150 series) ........ 108

3.3.4 Repairing Major Components Disassembly/Assembly Procedure .......... 113

3.3.4.1 Maintenance Box/Porous Pad Assy ................................................. 113

3.3.4.2 Exterior Parts .................................................................................... 114

3.3.4.3 ADF/SCN Unit or SCN Unit ............................................................ 122

3.3.4.4 Paper Guide Front Assy ................................................................... 124

3.3.4.5 Paper Guide Lower Porous Pad ........................................................ 125

3.3.4.6 Print Head ......................................................................................... 126

3.3.4.7 Main Board ....................................................................................... 129

3.3.4.8 Ink Tank ........................................................................................... 131

3.3.4.9 Paper Guide Upper Left ................................................................... 134

3.3.4.10 Paper Guide Upper Right ............................................................... 138

3.3.4.11 PF Roller ......................................................................................... 139

3.3.4.12 Housing Rear Assy ......................................................................... 141

3.4 Detailed Disassembly/Reassembly Procedure for each Part/Unit .................... 142

3.4 Routing FFCs/cables ........................................................................................ 146

Chapter 4 Adjustment

4.1 Required Adjustments ...................................................................................... 152

4.2 Adjustment Program ......................................................................................... 156

4.2.1 Operating Environment ........................................................................... 156

4.2.2 Adjustment and Inspection List ............................................................... 156

4.2.3 Details of the Adjustment Program ......................................................... 162

4.3 Mechanism Adjustment / Check ...................................................................... 168

4.3.1 Checking the Platen Gap ......................................................................... 168

4.3.1.1 Preparation ........................................................................................ 168

4.3.1.2 Confirmation procedure ................................................................... 170

4.3.2 Touch Panel Adjustment (ET-4750/ET-4760/L6190/ST-4000 series only) .. 171

5.1.2 Cleaning the nozzle plate section of the Print Head

(ET-2750/ET-2760/L4160/ST-2000 series/ET-2700/L4150 series) ...... 175

5.1.3 Cleaning the Exterior Parts/inside of the printer ..................................... 176

5.2 Lubrication ....................................................................................................... 176

5.2.1 Lubrication Points and Instructions ......................................................... 177

Chapter 6 Appendix

6.1 Connector Diagram .......................................................................................... 182

6.2 Head Fuse ......................................................................................................... 183

6.3 Protection for Transportation ........................................................................... 184

6.3.1 Securing the CR Unit ............................................................................... 184

6.3.2 Securing the ADF/SCN Unit (ET-4750/ET-4760/L6190/ST-4000 series/ET-

3750/ET-3760/L6170/ST-3000 series only) ........................................... 184

6.3.3 Securing the SCN Unit (ET-3700/ET-3710/L6160 series/ET-2750/ET-2760/

L4160/ST-2000 series/ET-2700/L4150 series) ...................................... 185

6.3.4 Securing the Panel Unit ........................................................................... 185

6.3.5 Securing the Stacker (ET-4750/ET-4760/L6190/ST-4000 series/ET-3750/ET-

3760/L6170/ST-3000 series/ET-3700/ET-3710/L6160 series only) ...... 186

6.3.6 Securing the Stacker (ET-2750/ET-2760/L4160/ST-2000 series/ET-2700/

L4150 series only) .................................................................................. 186

6.3.7 Securing the Duplex Unit (ET-4750/ET-4760/L6190/ST-4000 series/ET3750/ET-3760/L6170/ST-3000 series/ET-3700/ET-3710/L6160 series only) 187

6.3.8 Securing the Duplex Unit (ET-2750/ET-2760/L4160/ST-2000 series/ only) 187

6.3.9 Securing the Paper Support (ET-2750/ET-2760/L4160/ST-2000 series/ET-

2700/L4150 series only) ......................................................................... 188

Chapter 5 Maintenance

5.1 Cleaning ............................................................................................................ 174

5.1.1 Cleaning the CR Unit (ET-4750/ET-4760/L6190/ST-4000 series/ET-3750/

ET-3760/L6170/ST-3000 series/ET-3700/ET-3710/L6160 series) ........ 174

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OPERATING PRINCIPLES

CHAPTER

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EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

Nozzle plate

Cover Head

A#400 A#399 A#398

B#400 B#399 B#398

B#264

B#265

B#272

B#128

B#129

B#136

A#3 A#2

A#1

B#3 B#2 B#1

0.042 mm

1/600 inch

0.085 mm

1/300 inch

1.016 mm 24/600 inch

B#273

B#137

Cyan

Magenta

Yellow

Column A

Column B

Carriage movement direction

Paper feed direction

Column Color

ABk

B #1 - #128 Y

B #137 - #264 M

B #273 - #400 C

Not used

Black

Nozzle plate

Cover Head

1.1 Printer Mechanism Overview

This chapter describes overview of each mechanism inside the printer.

1.1.1 Print Head

μTFP1S head (p 13) is used for ET-4750/ET-4760/L6190/ST-4000 series/ET- 3750/ET-3760/L6170/ST-3000 series/ET-3700/ET-3710/L6160 series. F2 head (p 14) is used for ET-2750/ET-2760/L4160/ST-2000 series/ET-2700/ L4150 series.

 ET-4750/ET-4760/L6190/ST-4000 series/ET-3750/ET-3760/L6170/ST-

3000 series

Color Four colors: black (Bk), cyan (C), magenta (M), yellow (Y)

Number of nozzles 784 nozzles:

Nozzle pitch 300 dpi

/ET-3700/ET-3710/L6160 series

Table 1-1. Nozzle Configuration

400 nozzles for Bk, and 128 nozzles for each of Y, M, and C

Operating Principles Printer Mechanism Overview 13

Figure 1-1. μTFP1S Print Head appearance

Figure 1-2. Nozzle layout (seen from the rear side)

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EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

Nozzle plate

Cover Head

Black

Column A Column B

Carriage movement direction

Paper feed direction

Column Color

ABk

B #1 - #60 Y

B #62 - #120 M

B #122 - #180 C

Yellow

Cyan

Magenta

Not used

Nozzle plate

 ET-2750/ET-2760/L4160/ST-2000 series/ET-2700/L4150 series

Table 1-2. Nozzle Configuration

Color Four colors: black (Bk), cyan (C), magenta (M), yellow (Y)

Number of nozzles 357 nozzles:

180 nozzles for Bk, 59 nozzles for each Y, M, and C.

Nozzle pitch 180 dpi

0.071 mm

1/360 inch

5.9266 mm

42/180 inch

A#180 A#179 A#178

A#3 A#2

A#1

B#180 B#179 B#178

B#123 B#122 B#121

B#63 B#62 B#61

B#3 B#2

B#1

Figure 1-3. F2 Print Head appearance

Operating Principles Printer Mechanism Overview 14

Figure 1-4. Nozzle layout (seen from the rear side)

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EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

CR Scale

CR Timing Belt

CR Unit

CR Motor

(Backside of the Main Frame)

CR Encoder Sensor

Section view

Main Frame

CR Unit

Main Frame

1.1.2 Carriage (CR) Mechanism

The major components of the carriage (CR) mechanism are the CR Unit, CR Encoder Sensor, CR Scale, CR Motor, and CR Timing Belt. The CR mechanism is a key mechanism to ensure stable print quality because printing is performed by moving the CR Unit from side to side.

As shown on the right, Main Frame is holding the upper side and the lower side of the CR Unit. The CR Unit is attached to the CR Timing Belt that is moved by the CR Motor so that the assy can move from side to side to print. The position and speed of the CR Unit are always monitored by the CR Encoder Sensor and the CR Scale, and the CR Motor is controlled in accordance with the information acquired by the CR Encoder Sensor.

Operating Principles Printer Mechanism Overview 15

Figure 1-5. Carriage (CR) mechanism

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EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

Cassette

Slider Trans

Holder Cam Assy

PF Motor

PF Roller

Pick up Roller Assy

Intermediate roller

(inside the Duplex Unit)

EJ Roller

1.1.3 Paper Loading/Feed Mechanism

Paper loading mechanism differs between ET-4750/ET-4760/L6190/ST-4000 series/ET-3750/ET-3760/L6170/ST-3000 series/ET-3700/ET-3710/L6160 series and ET-2750/ET-2760/L4160/ST-2000 series/ET-2700/L4150 series. ET-4750/ET-4760/L6190/ST-4000 series/ET-3750/ET-3760/L6170/ST-3000 series/ET-3700/ET-3710/L6160 series employ the front paper loading, and ET2750/ET-2760/L4160/ST-2000 series/ET-2700/L4150 series employ the rear paper loading. The both paper loading mechanisms are driven by the PF Motor,

and the motor is also used for driving the paper feeding mechanism.

The printer is also equipped with a paper feeding mechanism for auto duplexing as well as other existing products. The mechanism flips paper after printing on the front side is finished, and feeds the paper to print on the back side.

 ET-4750/ET-4760/L6190/ST-4000 series/ET-3750/ET-3760/L6170/ST-

3000 series/ET-3700/ET-3710/L6160 series

A sheet of paper is fed inside the printer from the Paper Cassette by the Pick up Roller Assy.

Because the Pick up Roller Assy needs to be stopped each after it feeds a sheet of paper, it is necessary to control the transmission of a drive force to the assy. The control is achieved by the Slider Trans and the Holder Cam Assy. When the Slider Trans is moved by the CR Unit, the state of engagement between the transmission gear on the Trans Slider and the Pick up Roller driving gear changes, which enables switching between transmitting the PF Motor driving force to the Pick up Roller Assy and not transmitting it.

Even after the CR Unit is detached from the Slider Trans for printing, position of the Slider Trans is kept by the Holder Cam Assy.

The paper fed by the Pick up Roller Assy is conveyed by the intermediate roller, PF Roller, and EJ Roller which are included in the paper feeding mechanism.

*1. See "1.3 Paper Loading/Feed Mechanism" (p 23) for more details.

Figure 1-6. Paper loading/feed mechanism (1)

Operating Principles Printer Mechanism Overview 16

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EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

Paper Back Lever

Hopper

PF Motor

PF Roller

LD Roller

Intermediate roller

(inside the Duplex Unit)

EJ Roller

Change Lever

Clutch

Cam

 ET-2750/ET-2760/L4160/ST-2000 series/ET-2700/L4150 series

Paper is fed inside the printer from the ASF Rear by the LD Roller.

The ASF Rear is equipped with a Hopper, Paper Back Lever, Change Lever, LD Roller, and clutch. The Change Lever and the clutch work for transmitting a driving force from the PF Motor to the LD Roller and for not transmitting it.

The Hopper and the Paper Back Lever driven by the cam on the LD Roller Shaft prevent multi-feed and ensure accurate paper feeding.

Paper fed by the ASF Rear is conveyed by the PF Roller and the EJ Roller which are included in the paper feeding mechanism.

Unlike the front paper loading, intermediate roller is used only when flipping paper for duplex printing.

Figure 1-7. Paper loading/feed mechanism (2)

Operating Principles Printer Mechanism Overview 17

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Ink system mechanism

Maintenance Box/

Porous Pad Assy

1.1.4 Ink System Mechanism

The major components of the ink system mechanism*1 are a cap, pump unit, and waste ink tube.

The ink system mechanism employs the slide type capping. When the CR Unit returns to its capping position (home position), the Print Head is capped. The pump mechanism, wiper mechanism, and the CR Lock mechanism are driven by the PF Motor to clean the Print Head.

Waste ink sucked when cleaning the Print Head is collected in the Maintenance Box/Porous Pad Assy through the pump mechanism.

User replaceable Maintenance Box is installed to ET-4750/ET-4760/L6190/ ST-4000 series/ET-3750/ET-3760/L6170/ST-3000 series/ET-3700/ET-3710/ L6160 series. A CSIC mounted on the Maintenance Box keeps track of how much waste ink has been collected.

On the other hand, the Porous Pad that cannot be replaced by user is installed to ET-2750/ET-2760/L4160/ST-2000 series/ET-2700/L4150 series. The EEPROM on the Main Board keeps track of how much waste ink has been collected.

Figure 1-8. Ink system mechanism

*1. See "1.4 Ink System Mechanism" (p 34) for more details.

Operating Principles Printer Mechanism Overview 18

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1.1.5 List of Motor and Sensor

This section describes the types and positions of the motors and sensors.

 ET-4750/ET-4760/L6190/ST-4000 series/ET-3750/ET-3760/L6170/ST-

3000 series/ET-3700/ET-3710/L6160 series

Table 1-3. Motor and Sensor List

(ET-4750/ET-4760/L6190/ST-4000 series/ET-3750/ET-3760/L6170/ST-3000

series/ET-3700/ET-3710/L6160 series)

Mechanism name Motor/sensor name Motor/sensor type No.

Carriage mechanism

CR Motor DC Motor A

CR Encoder Transmission-type photo

interrupter

PW Sensor Reflection-type photo interrupter 2

Paper loading/feed mechanism

Others Ink Cover Open Sensor Mechanical contact 6

Scanner SCN Motor DC Motor C

PF Motor DC Motor B

PF Encoder Transmission-type photo

interrupter

Cassette Sensor Mechanical contact 4

PE Sensor Reflection-type photo interrupter 5

SCN Motor Encoder Transmission-type photo

interrupter

ADF PE Sensor Transmission-type photo

interrupter

Figure 1-9. List of motor and sensor

(ET-4750/ET-4760/L6190/ST-4000 series/ET-3750/ET-3760/L6170/ST-

3000 series/ET-3700/ET-3710/L6160 series)

Operating Principles Printer Mechanism Overview 19

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 ET-2750/ET-2760/L4160/ST-2000 series/ET-2700/L4150 series

Table 1-4. Motor and Sensor List (ET-2750/ET-2760/L4160/ST-2000 series/ET-

2700/L4150 series)

Mechanism name Motor/sensor name Motor/sensor type No.

Carriage mechanism

Paper loading/feed mechanism

Scanner SCN Motor DC Motor C

CR Motor DC Motor A

CR Encoder Transmission-type photo

interrupter

PW Sensor Reflection-type photo interrupter 2

PF Motor DC Motor B

PF Encoder Transmission-type photo

interrupter

ASF Rear Paper existence Sensor

PE Sensor Reflection-type photo interrupter 5

SCN Motor Encoder Transmission-type photo

Mechanical contact 4

interrupter

Figure 1-10. List of motor and sensor

(ET-2750/ET-2760/L4160/ST-2000 series/ET-2700/L4150 series)

Operating Principles Printer Mechanism Overview 20

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Scanner Unit

CIS Sensor

SCN Motor

ADF Unit

ADF PE Sensor

Pick up Roller

EJ Roller

PF Roller

SCN Motor

EJ Roller

Pick up Roller

Transmission

gear

ADF Document

Lever

1.2 Scanner/ADF Overview

1.2.1 Scanner Mechanism

The scanner mechanism consists of a CIS sensor that scans documents and the SCN motor that drives the scanner carriage. The CIS sensor and the SCN motor are integrated as the scanner carriage, and it moves along the rail on the scanner housing to scan documents.

1.2.2 ADF Mechanism (ET-4750/ET-4760/L6190/ST-4000 series/ET-3750/ET-3760/L6170/ST-3000 series only)

The PF Roller, EJ Roller, and Pick up Roller of the ADF mechanism are driven by the SCN Motor. The drive force of the motor is transmitted through the transmission gear. The ADF mechanism does not support auto duplex scanning.

Figure 1-11. Scanner mechanism

Figure 1-12. ADF mechanism

Operating Principles Scanner/ADF Overview 21

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EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

Pick up Roller Separation roller

PF Roller

EJ Roller

CIS Sensor

Lever of ADF PE Sensor

ADF Document Lever

No document on ADF

Document is present on ADF

ADF document lever

Sub document

lever

Sub document lever ADF document lever

ADF top

ADF inside

ADF bottom

When scanning document, the document is fed inside the ADF as shown below.

Figure 1-13. Document Feed Path

Presence or absence of document on the ADF is detected by the ADF Document Lever and the scanner CIS Sensor. The lever moves up or down depending on the presence or absence of document, and the end of the lever is scanned by the CIS Sensor. According to the scan result, the printer determines whether document is present or not.

Additionally, there is a Sub Document Lever beside the ADF Document Lever. If the CIS Sensor cannot scan the end of the Sub Document Lever, the printer determines that the scanner (SCN) unit is open or the CIS Sensor is malfunctioning.

Operating Principles Scanner/ADF Overview 22

Figure 1-14. ADF document lever

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1.3 Paper Loading/Feed Mechanism

1.3.1 Overview

1.3.1.1 Paper Loading Method

Paper loading method differ between ET-4750/ET-4760/L6190/ST-4000 series/ET-3750/ET-3760/L6170/ST-3000 series/ET-3700/ET-3710/L6160 series and ET-2750/ET-2760/L4160/ST-2000 series/ET-2700/L4150 series, but the both paper loading mechanisms are driven by the PF Motor.

Table 1-5. Paper Loading Method and Drive Force

Drive

force

(motor)

PF Motor PF encoder/

Motor control

PF scale

Front paper loading

• Turn the Slider Trans to ASF mode, drive the Pick up Roller Assy, and load paper from the cassette.

• Paper loaded from the cassette is fed to the PF Roller by the intermediate roller inside the duplex unit.

• Drive the PF Roller/EJ Roller to convey the paper.

Paper loading operation

model

Rear paper loading

model

• Drive the LD Roller and load paper from the ASF Rear.

• Drive the Hopper/Paper Back Lever to prevent multi-feed.

• Drive the PF Roller/EJ Roller to convey the paper.

• To flip paper for duplex printing, drive the intermediate roller inside the duplex unit. The paper is flipped and then fed to the PF Roller.

The following describes which paper loading method is used for which model.

 Front paper loading

ET-4750/ET-4760/L6190/ST-4000 series/ET-3750/ET3760/L6170/ST-3000 series/ET-3700/ET-3710/L6160 series/

 Rear paper loading

ET-2750/ET-2760/L4160/ST-2000 series/ET-2700/L4150 series

Operating Principles Paper Loading/Feed Mechanism 23

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Intermediate roller

Pick up Roller Assy

PF Roller

EJ Roller

PF Motor

Holder Cam Assy

Slider Trans

Cassette

PF Encoder

Hopper

LD Roller

Change Lever

Clutch

PF Encoder

PF Roller

EJ Roller

Stacker

Front paper loading model

Rear paper feeding model

Figure 1-15. Paper loading/feed mechanism

Operating Principles Paper Loading/Feed Mechanism 24

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Cassette

EJ Roller

Star Wheel

Holder Assy

PF Roller

Intermediate roller

PE Sensor

Pick up Roller Assy

Stacker

EJ Roller

Star Wheel

Holder Assy

PF Roller

PE Sensor

LD Roller

Hopper

1.3.1.2 Paper Feed Path

1.3.1.2.1 Front Paper Loading

Paper loaded into the cassette is fed to the intermediate roller by the Pick up Roller Assy, and then arrives at the PE Sensor position.

Next, skew is corrected, and printing on the paper is performed while the paper is being fed by the PF Roller and EJ Roller/Star Wheel Holder Assy, then the paper is ejected to the Stacker.

1.3.1.2.2 Rear Paper Loading

Paper put on the Hopper is fed by the LD Roller and arrives at the PE Sensor position.

Next, skew is corrected, and printing on the paper is performed while the paper is being fed by the PF roller and EJ Roller/Star Wheel Holder Assy, then the paper is ejected to the Stacker.

Operating Principles Paper Loading/Feed Mechanism 25

Figure 1-16. Paper feed path of front paper loading

Figure 1-17. Paper feed path of rear paper loading

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EJ Roller

Star Wheel

Holder Assy

PF Roller

PE Sensor

Intermediate roller

1.3.1.2.3 Paper Loading Path for Auto Duplex Printing

When printing on one side is finished, the printer waits for the ink on the one side to dry keeping the paper nipped between the PF Roller and Driven Roller. After a predetermined drying time has passed, the PF Roller and EJ Roller are rotated in the reverse direction to pull the paper inside the auto duplex unit. When the leading edge of the paper is detected by the PE Sensor, skew is corrected, and then printing on the back side is performed.

Figure 1-18. Paper feed path for auto duplex printing (back side printing)

Operating Principles Paper Loading/Feed Mechanism 26

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PF Motor

Compound gear PF1

PF Roller

Spur gear PF1

Spur gear PF2

EJ Roller

Spur gear PF1

PF Roller

PF Motor PF Encoder

Compound gear

PF1

Spur gear PF2

Spur gear

PF1

EJ gear

EJ Roller

PF Roller

EJ Roller

Duplex unit system

Pick up Roller Assy system

PF Motor

1.3.2 Operation Principle

1.3.2.1 Drive Path

1.3.2.1.1 Drive Path of Front Paper Loading Model

The drive force of the PF Motor is transmitted to the PF Roller and EJ Roller through the compound gear and the spur gear, and then transmitted from the PF Roller to the paper feed mechanism. There are two drive paths; duplex unit system

DRIVE PATH FROM PF MOTOR TO PF ROLLER/EJ ROLLER

(p 28) and Pick up Roller Assy system (p 29).

Figure 1-20. Drive path from PF Motor to PF Roller/EJ Roller (2)

Figure 1-19. Drive path from PF Motor to PF Roller/EJ Roller (1)

Operating Principles Paper Loading/Feed Mechanism 27

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EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

PF Roller (spur gear 9)

Compound gear 28.8-14.4

Spur gear 22.8

One way clutch

External gear B (80 digit side)

Intermediate roller

Spur gear 17.28

Sun gear

Planetary gear (x5)

External gear A (0 digit side)

Spur gear 17.28

Spur gear 16/spur gear duplex

One way

clutch

PF Roller

Intermediate Roller

PF Motor

Structure of one way clutch

Planetary gear

Sun gear

External

gear A

External

gear B

External

gear A

External

gear B

Sun gear

Rotational direction of sun gear and motion

of external gear seen from 0 digit side

Idle

Clockwise

Counterclockwise

Rotate

Compound gear

28.8-14.4

Spur gear 22.8

Spur gear 17.28

Spur gear 16/Spur gear duplex

DRIVE PATH FROM PF ROLLER TO INTERMEDIATE ROLLER (DUPLEX UNIT SYSTEM)

The intermediate roller always rotates in the paper feed direction because of the one way clutch, regardless of the PF roller rotational direction.

The one way clutch is consist of the sun gear, the external gear (x2) on both sides of the sun gear, and the planetary gear (x5 each) inside the external gear. When the sun gear rotates, either one of the external gears idle being disengaged from the planetary gears, while the external gear on the other side rotates being engaged with the planetary gears. In this way, the one way clutch is designed to rotate either one of the two external gears at a time, and which one to rotate depends on the rotational direction of the sun gear.



Figure 1-21. Drive Path From PF Roller to Intermediate Roller (1)

Operating Principles Paper Loading/Feed Mechanism 28

Figure 1-22. Drive Path From PF Roller to Intermediate Roller (2)

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PF Roller (spur gear 9)

Compound gear 28.8-14.4

Spur gear 17.6 (Slider Trans)

One way clutch

Sun gear

Planetary gear (x3)

External gear

Spur gear 28

Pick up drive shaft

Spur gear 16B

Spur gear 16

Spur gear 16B

Spur gear 16

Pick up Roller

One way clutch

When drive force

of PF Motor is not

transmitted

Spur gear 17.6

(Slider Trans)

Pick up drive shaft

Spur gear

Spur gear 16B

PF Roller

Spur gear 28

Compound gear 28.8-14.4

CR Unit

Planetary

gear

Sun gear

External gear

Holder

Cam Assy

Pick up Roller

DRIVE PATH FROM PF ROLLER TO PICK UP ROLLER (PICK UP ROLLER ASSY SYSTEM)

If the Pick up Roller Assy is always driven by the PF motor, it continues feeding paper without stopping regardless of the progress of printing on the previous sheet. To prevent this, the Slider Trans interrupts the motor drive to the Pick up Roller Assy when the assy needs to stop.

While the Pick up Roller Assy needs to move, the Slider Trans is pulled toward the opposite side of the carriage home with the tension spring. The transmission gear interlocked with the Slider Trans engages with the Pick up Roller driving gear (one way clutch) that moves the Pick up Roller Assy, so the Pick up Roller Assy can be driven by the PF Motor. If the CR Unit pushes the Change Lever to the 0 digit side, the transmission gear disengages from the one way clutch. As a result, the driving force of the PF Motor is shut down.

The CR Unit pushes the Slider Trans to the 0 digit side to stop the Pick up Roller Assy after a sheet of paper is fed into the printer, however, the CR Unit cannot stay at the position because it needs to move for printing. Therefore, instead of the CR Unit, the Change Lever’s disengaged status is kept by the cam of the Holder Cam Assy during printing.

The one way clutch controls the Pick up Roller to rotate only in the paper feed direction. The operation principle and the structure are basically the same with the one used in the drive path to the intermediate roller

(p 28). Therefore, while

the PF Roller is rotating in the direction opposite to the paper feed direction, the Pick up Roller does not rotate even when the drive force is transmitted through the Slider Trans.

Operating Principles Paper Loading/Feed Mechanism 29

Figure 1-23. Drive path from PF roller to Pick up Roller Assy (1)

Figure 1-24. Drive path from PF roller to Pick up Roller Assy (2)

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PF Motor

Compound gear PF1

PF Roller

Spur gear PF1

Spur gear PF2

EJ Roller

Spur gear PF1

PF Roller

PF Motor

PF Encoder

Compound

gear PF1

Spur gear PF2

Spur gear PF1

EJ gear

EJ Roller

PF Roller

EJ Roller

Duplex unit system

ASF Rear system

PF Motor

Hopper

1.3.2.1.2 Drive Path of Rear Paper Loading Model

The drive path of the rear paper loading model is mostly the same with the front paper loading model. The driving force of the PF Roller is transmitted to the PF Roller and the EJ Roller through the compound gear and the spur gear, and then transmitted from the PF Roller to the paper feed mechanism. There are two drive paths; duplex unit system

(p 31) and ASF Rear system (p 32).

DRIVE PATH FROM PF MOTOR TO PF ROLLER/EJ ROLLER

Figure 1-25. Drive path from PF Motor to PF Roller/EJ Roller (1)

Figure 1-26. Drive path from PF Motor to PF Roller/EJ Roller (2)

Operating Principles Paper Loading/Feed Mechanism 30

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PF Roller (spur gear PF)

Compound gear 27.2-22.2

Compound gear 38.4-15.6

One way clutch

External gear B (80 digit side)

Intermediate roller

Spur gear 21.6

Sun gear

Planetary gear (x5)

Spur gear 21.6

Spur gear16/spur gear duplex

External gear A (0 digit side)

One way

clutch

PF Roller

Intermediate roller

PF Motor

Planetary gear

Sun gear

External

gear A

External

gear B

External

gear A

External

gear B

Sun gear

Rotate

Idle

Clockwise

Counterclockwise

Idle

Rotate

Compound gear

38.4-15.6

Spur gear 21.6

Spur gear

21.6

Spur gear 16/Spur gear duplex

Compound gear

27.2-22.2

Change

Lever

Structure of one way clutch

Rotational direction of sun gear and motion

of external gear seen from 0 digit side

DRIVE PATH FROM PF ROLLER TO INTERMEDIATE ROLLER (DUPLEX UNIT SYSTEM)

The intermediate roller always rotates in the paper feed direction because of the one way clutch, regardless of the PF roller rotational direction.



Figure 1-27. Drive Path From PF Roller to Intermediate Roller (1)

Operating Principles Paper Loading/Feed Mechanism 31

Figure 1-28. Drive Path From PF Roller to Intermediate Roller (2)

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PF Roller (spur gear PF)

Compound gear 27.2-22.2 (Change Lever)

Compound gear 38.4-15.6

LD Roller

Clutch

Paper Back Lever

Hopper

Cam A

Cam B

Hopper

Clutch

CR Unit

PF Roller

PF Motor

Paper Back Lever

LD Roller

Compound

gear

38.4-15.6

Cam A

Cam B

Change Lever

Compound

gear 27.2-22.2

Compound

gear 38.4-15.6

PF Roller

Compound

gear 27.2-22.2

Clutch Change Lever

Pawl of clutch

DRIVE PATH FROM PF ROLLER TO LD ROLLER (ASF REAR SYSTEM)

The drive force of the PF Motor is transmitted to the LD Roller through the PF Roller, Change Lever (compound gear 27.2-22.2) and the clutch. The Hopper and the Paper Back Lever is driven by the cam linked to the LD Roller.

Since the PF Motor also drives the paper feed mechanism and the ink system mechanism, transmission of the drive force to the LD Roller is controlled by the Change Lever and the clutch so that the LD Roller rotates only when

loading paper. Relation between the rotational direction of the PF Motor and the motion of the

LD Roller are shown below.

PF Motor rotational

direction

Paper feed direction

Opposite to the paper feed

direction

Motion of LD Roller

The clutch transmits or does not transmit the drive force to the LD Roller in relation to the Change Lever. When transmitted, the LD Roller rotates in the paper feed direction.

The LD Roller does not rotate since the drive force is disengaged by the clutch.

Figure 1-29. Drive Path From PF Roller to LD Roller (1)

*1. See " Operation of Paper Loading Mechanism" (p 33) for more details.

Figure 1-30. Drive Path From PF Roller to LD Roller (2)

Operating Principles Paper Loading/Feed Mechanism 32

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Normal operation: ASF locked

Operation at paper loading: ASF unlocked

CR Unit

(home position)

PF Roller

Change Lever

LD Roller

Clutch

Pawl of clutch

CR Unit

(retracts from the home position to the

80 digit side.)

The lock of the Change Lever is

disengaged.

Operation at paper loading: ASF drive state

OPERATION OF PAPER LOADING MECHANISM

The following describes how the Change Lever and the clutch work for transmitting or not transmitting the PF Motor drive force to perform paper feeding.

 Drive force control by the Change Lever and clutch

When the Change Lever holds the pawl of the clutch (ASF lock state), the clutch is disengaged and the drive force of the PF Motor is not transmitted to the LD Roller.

When the Change Lever releases the pawl of the clutch (ASF unlock/ASF drive state), the clutch is engaged and the drive force of the PF Motor is transmitted to the LD Roller.

 Normal operation

While the CR Unit is in the home position, it prevents the Change Lever from leaning toward the front side. Therefore, the Change Lever keeps the ASF lock state regardless of the rotation direction of the PF Motor and the clutch is disengaged to shut off the drive force of the PF Motor to the LD Roller.

Even when the CR Unit is not in the home position for printing or other reason, the ASF lock state is kept to shut off the drive force to the LD Roller as long as the PF Motor rotates CW (in the paper feed direction).

 Operation at paper loading

When the printer starts loading paper, the CR Unit moves away from the home position and the PF Motor starts rotating CCW. This causes the Change Lever to lean toward the front side and the ASF is unlocked. Then, the clutch is engaged, and the drive force of the PF Motor is transmitted to the LD Roller.

After the ASF is unlocked, the PF Motor starts rotating CW, and the LD Roller starts rotating in the paper feed direction. The LD Roller and the Retard Roller separate a sheet of paper from the other sheets on the Hopper and feed it into the printer. At this point, the Change Lever has returned to the original position (leaning toward the rear side).

After the LD Roller rotates once, the Change Lever holds the pawl of the clutch and the ASF is locked. Then, the drive force of the PF Motor to the LD Roller

is shut off, and the paper loading ends.

Figure 1-31. Operation of Paper Loading Mechanism

*1. The LD Roller is shaped in a character of D. Because of this shape, the LD Roller and Retard Roller can release a

sheet when the sheet reaches the PF Roller so that the paper feed by the PF Roller is not affected.

(seen from 80 digit side)

Operating Principles Paper Loading/Feed Mechanism 33

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Capping

mechanism/

cap slider

Maintenance Box

(Waste Ink Tank)

Pump mechanism

Wiper mechanism

CR Lock mechanism

Adapter

Print Head

Front paper loading

model

(ET-4750/ET-4760/

L6190/ST-4000 series/

ET-3750/ET-3760/

Rear paper loading

model

(ET-2750/ET-2760/

L4160/ST-2000 series/

Pump mechanism

Cap Slider

Wiper

Cap

CR Lock

Cap Slider

Wiper

Cap

CR Lock

Pump mechanism

1.4 Ink System Mechanism

1.4.1 Overview

1.4.1.1 Mechanical Configuration

The ink system mechanism of this product employs the sliding type*1 and consists of the CR Lock mechanism, wiper mechanism, capping mechanism, and pump mechanism.

All the mechanisms are driven by the PF Motor. The drive force of the PF Motor is transmitted to each mechanism via transmission parts, such as the pump-drive compound gear, clutch gear, and cam. Additionally, ET-4750/ET4760/L6190/ST-4000 series/ET-3750/ET-3760/L6170/ST-3000 series/ET3700/ET-3710/L6160 series utilize a user-replaceable Maintenance Box (waste ink pad) that retains waste ink from the cap.

Figure 1-32. Ink system mechanism (simplified model)

*1. There are two types of the capping: sliding type and direct acting type. In the sliding type, the Print Head is capped

(the cap is moved up) when the CR pushes the cap slider. In the direct acting type, the cap moves up and down independently of the CR and caps the Print Head.

Operating Principles Ink System Mechanism 34

Figure 1-33. Ink system mechanism

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Maintenance Box/

Porous Pad Assy

Paper Guide Lower Porous Pad

Paper Guide Lower Porous Pad D

Paper Guide Lower Porous Pad B/C

1.4.1.2 Cleaning

Clogging of nozzles on the Print Head occurs due to air bubbles generated inside the ink path of the Print Head, or an increase in ink viscosity caused by drying of ink. To prevent the clogging or clean the clogged nozzles, various types of cleaning (CL) are performed at different times as described in the table below.

Table 1-6. Print Head cleanings

CL Type Purpose Explanation

Initial ink charge To fill the head with ink Performed after the printer is

powered at the first time.

Timer cleaning (TCL)

Manual cleaning

(MCL)

Regular cap suction To prevent ink leakage

Flushing To prevent ink inside non-

*1. To save ink, the time between the timer cleanings is becoming longer on the most newer printers. This is achieved

by adopting the plastic that have the function to suppress the growth of air bubbles inside the Print Head and by improving in shape of the ink supply nozzles.

*2. When carrying out manual cleaning, CL1 → CL2 → CL3 are automatically selected and performed in order. How-

ever, in the following conditions, they may not be carried out in this order. (EX) CL3 may change to CL2 depending on the ink remaining quantity and conditions of maintenance counter and others. If the interval between cleaning is more than a specified period, then this may not be counted as continuous.

*3. “Main suction” is a suction operation that sucks up ink from cartridges to the Print Head, and at the same time, sucks

out air bubbles inside the Print Head and thick ink inside the nozzles. *4. “Wiping” removes ink attached to the Print Head nozzle surface. *5. “Cap suction” is a suction operation that sucks ink out of the cap. *6. “Small amount suction” is a suction operation performed to eject tiny air bubbles from the Print Head. Ink amount

sucked by this operation is less than that by the “Main suction”. *7. Some off-carriage type printers use a choke valve mechanism to perform the cleaning.

To eject bigger air bubbles inside the Print Head

CL1 To restore a proper

convex meniscus of ink at the tip of nozzles

CL2 To eject air bubbles inside

the Print Head

CL3

To eject air bubbles inside the ink supply nozzles

from the cap

used nozzles from increasing its viscosity

Performed according to the printing time and time elapsed since the last cleaning.

Main suction*3(short) → Wiping*4 → Cap suction*5 → Small amount suction*6 → Cap suction

Main suction (middle) → Wiping → Cap suction → Small amount suction → Cap suction

Main suction (long) → Wiping → Cap suction → Small amount suction → Cap suction

Sucks out ink pooling inside the cap due to head flushing operations or the like.

The Print Head is controlled to fire ink droplets from the nozzles periodically.

1.4.1.3 Controlling Waste Ink

Ink used by cleanings (waste ink) is absorbed by the waste ink pad. If the absorbed amount exceeds the limit of the waste ink pad, leakage of the waste ink can occur. To prevent this, the printer firmware has a counter to counts the waste ink amount taking evaporation into account, The count value is retained in the Maintenance Box CSIC (ET-4750/ET-4760/L6190/ST-4000 series/ET3750/ET-3760/L6170/ST-3000 series/ET-3700/ET-3710/L6160 series only) and in the EEPROM.

Another waste ink produced by borderless printing is absorbed by absorbers attached on the Paper Guide Front and the rear side of the printer. For the borderless printing, the printer makes an image slightly expand all the way to the edge of the paper, therefore, the image edge portions not printed on paper must be absorbed. Some printers also have the counter for this waste ink amount.

Figure 1-34. Position of Waste Ink Pad for Borderless Printing

If each counter reaches its limit, a maintenance error occurs and replacement of the maintenance box, or replacement of the waste ink pad and counter reset will be required.

Operating Principles Ink System Mechanism 35

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EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

PF Roller (spur gear PF)

Front paper loading model:

compound gear 28.8-14.4

Rear paper loading model:

compound gear 27.2-22.2

Spur gear

Compound gear equipped with a clutch

+ cam

Wiper

mechanism

CR Lock

mechanism

Pump driving gear

Pump mechanism

PF Roller

Compound gear 28.8-14.4

Compound gear 27.2-22.2

Pump driving gear

Cap slider

Spur gear

Spur gear PF

PF Roller

Spur gear

Compound gear equipped

with a clutch + cam

Cap slider

Wiper

CR Lock

Compound gear equipped

with a clutch + cam

CR Lock

Cap

Front paper loading model

Rear paper loading model

Spur gear PF

1.4.2 Operating Principles

1.4.2.1 Drive Path

The ink system mechanism is driven by the PF Motor.

To the pump mechanism, the drive force is constantly transmitted via the PF Roller, compound gear, Pump driving gear, and etc.

The drive force is transmitted to the wiper mechanism and CR Lock mechanism via the PF Roller, spur gear, compound gear equipped with a clutch, and cam. The clutch works in accordance with movement of the cap slider and cam, and interrupts the drive force upon completion of the movement.

Figure 1-35. Drive path (1)

The table below shows how each mechanism operates according to the rotational direction of the PF Motor.

Table 1-7. PF motor rotational direction and operation of the ink system

Mechanism

Wiper Moves down Moves up (wiping position)

Pump Release Suction

CR Lock Unlocks the CR Locks the CR

*1. Rotational direction seen from output shaft

Operating Principles Ink System Mechanism 36

Rotational direction of the PF Motor

CW CCW

Figure 1-36. Drive path (2)

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Pump motor counter-clock wise rotation (suction)

Rotates flattening

the tube.

Rotates without

flattening the tube.

Pump motor clock wise rotation (release)

Spur gear 21.6

Pump tube

Pump shaft

Pump spring (x2)

Pump cam

Pump pulley

Pump frame

The cap slider pressed by the CR unit moves upward and cap the Print Head.

CR unit moves to the home position (0 digit side)

Ink system (cap unit)

Cap slider

CR Unit

Print Head

1.4.2.2 Operation of Each Mechanism

1.4.2.2.1 Pump Mechanism

The pump mechanism sucks ink from the Print Head at cleaning.

The drive force from the pump-drive compound gear is transmitted to the pump shaft via the timing plate. This timing plate allows the pump-drive compound gear to start rotating at the different timing from the pump shaft. After the PF Motor rotates for a while, the pump unit starts its operation.

When the pump motor rotates counter-clock wise as seen from the output-shaft side of the motor, the drive force via the pump-drive compound gear rotates the pump pulley to flatten the tube to suck the air (to generate negative pressure) inside the tube. When the pump motor rotates clock wise, the pump pulley does not flatten the tube, and the negative pressure is released.

1.4.2.2.2 Capping Mechanism

When the CR Unit returns to its home position, the cap slider pressed by the CR Unit moves upward to cap the Print Head. When the CR Unit moves away from the home position, the cap slider moves downward and the Print Head is uncapped and released from the vacuum state. The ink system for this product does not have a valve for canceling the vacuum state, but the cap slider moved by the CR Unit provides the same function as the valve.

Operating Principles Ink System Mechanism 37

Figure 1-37. Pump mechanism operations

Figure 1-38. Capping mechanism operations

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EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

Carriage is not at home (Clutch throw-out) Cap slider is lifted (Clutch engaged)

PF motor rotates CW to move the wiper up

PF motor rotates CCW to move the wiper down

Cap slider

Cam

Compound gear equipped with a clutch

Cam groove (1)

Wiper salient

Cap slider salient

Cam groove (1)

Wiper salient

The cap slider movement causes its salient that secures the cam to come off the cam groove (2), so the cam is rotated being driven by the gear engaged.

The cam rotates CW when the PF motor rotates CW and the wiper is moved up.

The cam rotates CCW when the PF motor rotates CCW and the wiper is moved down.

Even if the cap slider goes down after releasing the cam to make it rotate, the cap slider salient does not engage with the cam groove (2) (the cam is not locked). The cam groove (2) shape is designed to engage with the cap slider salient only when the wiper goes down.

Cam groove (2)

Cap slider salient

Wiper salient

The cap slider salient secures the cam, so the gear of the compound gear set is thrown out and the PF motor drive is not transmitted to the cam.

Cam groove (2)

1.4.2.2.3 Wiper Mechanism

The wiper moves in synchronization with the capping operation. The PF motor drive transmitted through the compound gear set and cam equipped with clutch moves the wiper up or down.

Operating Principles Ink System Mechanism 38

Figure 1-39. Wiper mechanism operation

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EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

Only when the cap slider goes up, the cam can move to lock or unlock the CR.

Unlocking

Locking

Cap slider

1.4.2.2.4 CR Lock Mechanism

The CR Lock operates in synchronization with the cap unit. It locks or unlocks the CR using the PF motor drive force transmitted through the cam of the compound gear set equipped with a clutch. For information on how the cap slider and the cam are related to each other, see

"1.4.2.2.3 Wiper Mechanism"

(p 38).

Figure 1-40. CR Lock mechanism operation

Operating Principles Ink System Mechanism 39

Confidential

TROUBLESHOOTING

CHAPTER

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EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

2.1 Troubleshooting

This section describes the troubleshooting workflow and fatal error information.

2.1.1 Troubleshooting Workflow

The following page describes the troubleshooting workflow. Follow the flow when troubleshooting problems.

 This flowchart is compiled based on the following

contents.

• Our experience regarding the quality problem.

• ESK’s repair data.

• Printer Mechanism specification for the product.

 If the reason for the return is evident, first check the

phenomenon user claims recurs, then proceed to the troubleshooting.

 If the SCN error is the reason for the return, since the

printer may be the cause of the error, check the Fatal Error Code history saved in the EEPROM with the adjustment program before starting the troubleshooting.

 " Workflow when the Power is ON (Printer) (p42) "

 " Workflow for Scanner Errors when the Power is ON (p45) "

 " Workflow for Errors when Printing Starts (p46) "

Troubleshooting Troubleshooting 41

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(p 43)

Error?

031006

Error

031004

Error

Paper jam

Maintenance error

Stop

Fatal error occurred?

Error?

Release CR Lock

Stop

Yes

Seeks home position

Power on (printer)

031006

031004

xxxxxx

xxxxxx xxxxxx

2.1.1.1 Workflow when the Power is ON (Printer)

 Fatal Errors may occur during the Mechanism operation. When an error occurred other

than the timing shown below, check the Mechanism for other causes.

 See "2.1.1.2 Workflow for Scanner Errors when the Power is ON (p45) " since the scanner

operates during the power-on sequence of the printer.

 Displayed screen may differ by the model.

Blowout of a fuse of the Main Board  Check disconnection, breakage, slant connection, or damage contact of the Head

FFC.

 Print head is broken.  Replace the Main Board.

Detects abnormality of the Head Thermistor.  Check disconnection, breakage, slant connection, or damage contact of the Head

FFC.

 Print head is broken.

 Replace the Main Board.

 Paper jam

 PE Sensor adjustment value abnormality

 Check if the PE Sensor is broken, or its cable is disconnected, broken or connected

at an angle.

 Replace the Main Board.

Maintenance error Replace the Maintenance Box.

Main or borderless maintenance error Reset the Main or Borderless Waste Ink Pad Counter.

1. PF Motor did not rotate. (Error Code: 000041)

2. PF Motor rotated too fast. (Error Code: 000041)

3. PF Motor rotated. (Error Code: 000043)

1. Disconnection of the PF Motor Connector, load is too large for the paper feed mechanism.

2. Replace the PF Encoder FFC, the PF Encoder.

3. Replace the PF Motor.

Common: Replace the Main Board.

Note “*1”: Mechanism does not operate yet.

Troubleshooting Troubleshooting 42

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EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

Stop

(p 42)

(p 44)

Error?

Stop

CR reciprocation

Error?

Paper ejection

Paper jam

CR error

Error? CR moves?

CR stopped

Stop

Yes

xxxxxx

CR did not function.  Remove the tape securing the CR if the error occurs when the printer is powered on

for the first time.

 Check whether the CR Lock is released. If not, the PF Motor or the Ink system is

broken.

 Check the mechanical load of the CR manually, and check the Ink system also.

 CR Motor disconnect, replace the cable.

 Replace the CR Motor.  Replace the Main Board.

1. Fatal Error (Error Code: 000025)

2. Fatal Error (Error Code:000023 [Stops with noises.])

3. Fatal Error (Error Code: 000031)

1. Check whether any obstacle exists in the CR motion range.

2. Check whether any problem occurred to the CR Lock and Ink System.

3. Check if the Timing Belt is loose.

4. Clean or replace the CR Encoder Scale.

5. Replace the Main Board.

PE Sensor detected paper presence

Note PF Motor rotates for a while (longer than normal), and then the error occurs.

 Check if any obstacle exists in the Paper Path. Remove it if any.

 Check PE Sensor FFC disconnection/breakage, or replace the FFC.

 Replace the PE Sensor.  Replace the Main Board.

Paper jam error occurred.  Check if there is any obstacle in the CR motion range.

 Check if the CR Motor gets stuck somewhere when moved by hand.

 Check if any heavy load exists in the CR motion range.

Note Perform the corresponding repair.

Fatal Error of CR system occurred.  Check if there is any obstacle in the CR motion range.

 Check if the CR Motor gets stuck somewhere when moved by hand.

 Check if any heavy load exists in the CR motion range.

Note Perform the corresponding repair.

Troubleshooting Troubleshooting 43

Note “*2”: Performed if an abnormality occurred the last time the printer was powered off.

“*3”: CR Unit reciprocates two times quickly when environmental temperature is lower than 5°C or when initial charge is not performed yet.

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EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

Stop

END

(p 43)

Mechanism operation finish

CR Lock

Ink System operation

205102

Error

202620

Error

Error?

Ink error

Yes

202620

205102

Refill the ink tank, then select the refilled color on the panel to reset the ink counter.

Fill ink tank(s) with ink up to the upper line.

→Select the color(s) you refilled.

Maintenance Error (ET-4750/ET-4760/L6190/ST-4000 series/ET-3750/ET-3760/L6170/

Replace the Maintenance Box.

ST-3000 series/ET-3700/ET-3710/L6160 series)

Maintenance Box is at the end of its service life.

You need to replace it.

EWMB2 (model number)

Maintenance Error (ET-2750/ET-2760/L4160/ST-2000 series/ET-2700/L4150 series)

Replace the Porous Pad Assy.

The printer’s ink pad is at the end of its service life.

Please contact Epson Support.

Wireless LAN Board is broken.  Check the connection of the Wireless LAN Board.

 Replace the Wireless LAN Board.

Card Slot Board is broken. (ET-2750/ET-2760/L4160/ST-2000 series)  Check the state of the Card Slot Board FFC.

 Replace the Card Slot Board.

Note “*4”: Occurs five to six seconds after the completion of the mechanism operation.

Note “*5”: ET-2750/ET-2760/L4160/ST-2000 series only

Confidential

Troubleshooting Troubleshooting 44

EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

Power on (SCN)

Detects Home position

Moves to starting position for

white standard pattern reading

Error?

Reads white standard

pattern

Error?

Moves to the position for

reading home position*2

Error?

Reads home position

END

100016

Error

100017

Error

100032

Error

Stop

Yes

100016

100017

100032

2.1.1.2 Workflow for Scanner Errors when the Power is ON

 The scanner initial operation and the printer initialization are performed in parallel when

the power is turned on.

 Depending on the error type, a scanner error may occur after the printer was repaired

because some of the printer error indications have higher priority (and vice versa).

 For repair, replace the SCN Unit.

 Measurement failure does not occur when turning the power on. The measurement

sequence occurs when entering the power saving mode.

Home position detection error

 SCN CR cannot move to the home position because load is too large.

 CIS is broken (cannot read the white standard pattern and home position pattern).

1. Turn the power on with the Document Cover opened.

2. Check if the CIS moves to the left to read the white standard/home patterns.

3. Check if the emission color of the CIS is white (not greenish, reddish, or bluish). If the light does not look like white, check the SCN FFC for damage, disconnection or skew.

4. Replace the SCN Unit with a new one.

5. Replace the Main Board with a new one.

Contact detection distance exceeded

 Contact detection to the right side has not been completed properly.  Wheel Train of the Drive Mechanism is detached or broken.

 SCN Motor Wheel Train is detached or broken.

1. Turn the power on with the Document Cover opened.

2. Check if the SCN CR reaches (comes in contact with) the right side.

3. Check the Wheel Train of the Drive Mechanism for damage.

4. Check the SCN FFC for damage, disconnection or skew.

5. Replace the SCN Unit with a new one.

6. Replace the Main Board with a new one.

LED light lighting failure

 SCN FFC disconnection, breakage, slant connection, or damaged contact (CN409).

 CIS is broken.

1. Check the color of the LED at power-on.

2. Check the scanner FFC for damage, disconnection or skew.

3. Replace the SCN Unit with a new one.

4. Replace the Main Board with a new one.

Note “*1”: CIS does not light up.

“*2”: CIS lights in greenish white.

Troubleshooting Troubleshooting 45

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EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

Start

Paper feed variable

initialization, paper feed

preparation

Paper feed

Communication Error*1

Error?

Yes

Service Error*1

Yes

Network Communication

Error

(p 47)

Communication Error

Check the Wi-Fi/network connection For details, see your documentation

Communication Error

Check the Wi-Fi/network connection

950140

Service Error

The ReadyPrint Service is

unavailable

xxxxxx

2.1.1.3 Workflow for Errors when Printing Starts

Note “*1”: ET-4750U/ET-2750U only

Communication Error

 Network problem occurred

Subscription Error : Subscription communication error (950140)

 A communication error with the subscription server occurred.

1. Subscription Error : Subscription service error (Opt-Out) (950141)

- Received Opt-out from subscription server.

2. Subscription Error : Subscription service error (Halting) (950142)

- Received halt from subscription server.

3. Subscription Error : Subscription service error (Unregistered) (950143)

- Received unregistered from subscription server.

4. Subscription Error : Subscription service error (Starting up) (950144)

- During communication with the subscription server at startup.

 No need for repair actions at repair site. (It does not mean hardware failure. User

needs to check network settings and network connection status.)

 No need for repair actions at repair site. (It does not mean hardware failure. User

finds solution on subscription portal site or contacts the call center for solutions.)

 No need for repair actions at repair site. (It does not mean hardware failure. User

finds solution on subscription portal site or contacts the call center for solutions.)

Troubleshooting Troubleshooting 46

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EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

Paper Out (2)

Paper Out (1)Error?

Yes

Message?

Start Print

Paper jam (1)

Paper jam (2) (3)

Stop

END

Yes

(p 46)

xxxxxx

 Paper out in the Paper Cassette or the Rear Tray

 The leading edge cannot be detected with the PE Sensor in the range of the

standard movement.

 Paper out in the Paper Cassette or the Rear Tray

 The leading edge cannot be detected with the PE Sensor in the range of the

standard movement.

 Paper jam occurred in the path until the PE Sensor.

 PE Sensor, PW Sensor error

 CR system Fatal Error

Paper jam occurred while reversing paper or backside ejecting during paper feeding of duplex printing.

 Refill paper to the Paper Cassette and set the cassette back in place fully.

 PE Sensor/PW Sensor FFC disconnected, breakage, slant connection, damaged

contact (CN402/CN303).

 Replace the PE Sensor/PW Sensor.

 Replace the Main Board.

 Refill paper to the Rear Tray and set the Guide Paper back in place fully.

 PE Sensor/PW Sensor FFC disconnected, breakage, slant connection, damaged

contact (CN402/CN303).

 Replace the PE Sensor/PW Sensor.

 Replace the Main Board.

 Remove the foreign objects.

 PE Sensor/PW Sensor FFC disconnection, breakage, slant connection, damaged

contact (CN402/CN303).

 Replace the PE Sensor/PW Sensor.

 Troubleshoot and repair the CR system Fatal Error.  Replace the Main Board.

 Remove the foreign objects.

 Replace the Duplex Unit.

 Fatal Error: Head temperature error (031004)  Fatal Error: Head Hot error (before printing) (031001)

 Fatal Error: Head Hot error (after flushing) (031002)

Note Head Hot error does not occur when the signals do not flow fully because part or all of the

contact of FFC is covered by foreign objects or the like.

1. Check the Head FFC state (CN301).

2. Replace the Head.

3. Replace the Main Board.

Note Check the procedure in order.

Troubleshooting Troubleshooting 47

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EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

080 HP

2.2 Power-On Sequence

This section describes the power-on sequences as reference for troubleshooting. The preconditions are as follows.

 Condition: Power-on sequence (See Table2-1)

 No error occurred when you turned on the printer last time and it has been

correctly turned off.

 Initial ink charge was done and every tank has sufficient ink.  No paper on the paper path.  The Print Head is capped.  The Carriage is normally fixed by the CR Lock.  Maintenance error recovery has never been performed.

Table 2-1. Normal Power-on Sequence

Operation

1. Checking fuse on the Print Head 1-1.Checks if the fuse on the Print Head circuit boards is blown.*3

2. Checking for waste ink overflow

2-1.Checks the waste ink counter if the waste ink overflow is occurring.

CR Unit/PF Roller

movement and

position

PF Roller

CR Lock

Operation

4-5.The distance from the position where the CR Unit touched to the

Left Frame is regarded as the standard distance from the origin position, and the home position is fixed. From then on, the CR Unit position is monitored according to the signals from the CR Encoder.

5. Low temperature operation sequence *

5-1.The CR Unit moves back and forth quickly to near the left frame

two times.

6. Ink system performance while power on

6-1.The CR Unit goes back to the home position.

movement and

position

080 HP

Note *1 : The rotation directions of the PF Motor are as follows.

Clockwise: Paper is fed normally Counterclockwise: Paper is fed backward

*2 : The conditions of the CR Lock are as follows.

CR Unit/PF Roller

080

CR Unit

Red: CR Lock is set White: CR Lock is released

*3 : The fatal error occurs if there is a problem such as the fuse blew.

*4 : Executed when the detected temperature is under 5 oC (41oF) by the thermistor on the

Print Head.

3. Releasing the CR Lock

3-1.The PF Motor rotates counterclockwise and releases the CR Lock.

4. Seeking the home position

4-1.The CR Unit moves to the 0-digit side slowly and confirms it

touches the Right Frame.

4-2.The CR Unit moves to the 80-digit side slowly and confirms it does

not touch the foreign material, such as remaining paper.

4-3.The PF Motor rotates clockwise to completely release the CR Lock.

4-4.The CR Unit moves to the 0-digit side slowly and checks it touches

the Right Frame.

Troubleshooting Power-On Sequence 48

080 HP

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EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

Error code

LCD display screen

000021

2.3 Fatal Error Code List

This section describes how to check the fatal error code, description, and the possible causes.

2.3.1 Displaying the Fatal Error Code

The fatal error code is stored in the EEPROM on the Main Board and can be read out using the Adjustment Program. When a fatal error occurs, this product displays the fatal error code automatically on the panel LCD.

2.3.2 Fatal Error Code

This section describes the fatal error code and the possible cause for this product.

 " Scanner (p50) "

 " Printer (CR) (p56) "

 " Printer (PF) (p59) "

 " Printer (PW/PE Sensor) (p61) "

 " Printer (Power Supply) (p61) "

 " Printer (Head/CSIC) (p62) "

 " Printer (Others) (p63) "

 " System Error (p63) "

ADF related errors are included in the scanner fatal error list.

Figure 2-1. Indication of the fatal error code

Troubleshooting Fatal Error Code List 49

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EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

2.3.2.1 Scanner

Error

code

100001

100002 ADF PID reverse error

100003 ADF PID lock error

Error name Possible cause Confirmation procedure Connector No.

ADF PID excess speed error

 Failed to read the SCN motor encoder

1. Contamination of the SCN encoder scale

2. Damage or skew of the SCN encoder FFC

3. Failure of the SCN encoder sensor

 Failure of the SCN motor driver

4. Failure of the Main Board

 Paper feed fails, stopped by obstacles

1. Paper feed was stopped by;

• Obstacles such as jammed paper

• Overload of the paper feed mechanism

• Disengaging or tooth breakage of wheel train of the paper feed mechanism

 Failed to read the SCN motor encoder

2. Jumping of the SCN drive gear wheel train

3. Contamination of the SCN encoder scale

4. Damage or skew of the SCN encoder FFC

5. Failure of the SCN encoder sensor

6. Failure of the Main Board

 The ADF paper feed did not run or obstacles exist in the paper path

1. Overload of the paper feed mechanism

2. The paper feed mechanism is disengaged or its tooth is broken

 Failed to read the SCN motor encoder

3. Contamination of the SCN encoder scale

4. Disconnection, break, skew or damage of the SCN encoder FFC

5. Failure of the SCN encoder sensor

6. Failure of the SCN motor (the lead wire is broken or the connector is disconnected)

7. Failure of the Main Board

1. Clean the SCN encoder scale if it is contaminated.

2. Check the cable/FFC of the SCN motor/encoder.

3. Replace the SCN Unit with a new one.

4. Replace the Main Board with a new one.

1. Check that no pieces of paper or foreign objects exist in the paper path.

2. Check the load of the ADF paper feed mechanism.

3. Check the ADF/SCN drive gear wheel train.

4. Clean the SCN encoder scale if it is contaminated.

5. Check the cable/FFC of the SCN motor/encoder.

6. Replace the SCN Unit with a new one.

7. Replace the Main Board with a new one.

1. Check that no jammed paper exist in the paper path.

2. Check the load of the ADF paper feed mechanism.

3. Check the ADF/SCN drive gear wheel train.

4. Clean the SCN encoder scale if it is contaminated.

5. Check the cable/FFC of the SCN motor/encoder.

6. Replace the SCN Unit with a new one.

7. Replace the Main Board with a new one.

Main Board

CN410

Main Board

CN410

Main Board

CN410

Troubleshooting Fatal Error Code List 50

Confidential

EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

Error

code

100005

100006

100009

100010 ADF BS+ reverse error

Error name Possible cause Confirmation procedure Connector No.

ADF PID excess load error

ADF PID driving time error

ADF BS+ excess speed error

 The SCN motor stopped running in the middle of the operation

1. The ADF was stopped by;

• Obstacles such as jammed paper

• Overload of the paper feed mechanism

• Disengaging or breakage of the gears

 Failed to read the SCN motor encoder

2. Jumping of the SCN drive gear wheel train

3. Contamination of the SCN encoder scale

4. Disconnection, break, skew or damage of the SCN motor cable/ encoder FFC

5. Failure of the SCN motor (not completely broken)

6. Failure of the Main Board

Malfunction or crash of the firmware

 Failed to read the SCN motor encoder

1. Contamination of the SCN encoder scale

2. Damage or skew of the SCN encoder FFC

3. Failure of the SCN encoder sensor

 Failure of the SCN motor driver

4. Failure of the Main Board

 Paper feed fails, stopped by obstacles

1. Paper feed was stopped by;

• Obstacles such as jammed paper

• Overload of the paper feed mechanism

• Disengaging or tooth breakage of wheel train of the paper feed mechanism

 Failed to read the SCN motor encoder

2. Jumping of the SCN drive gear wheel train

3. Contamination of the SCN encoder scale

4. Damage or skew of the SCN encoder FFC

5. Failure of the SCN encoder sensor

6. Failure of the Main Board

1. Check that no pieces of paper or foreign objects exist in the paper path.

2. Check the load of the ADF paper feed mechanism.

3. Check the ADF/SCN drive gear wheel train.

4. Check the SCN encoder scale for damage or contamination.

5. Check the cable/FFC of the SCN motor/encoder.

6. Replace the SCN Unit with a new one.

7. Replace the Main Board with a new one.

1. Turn the printer off and back it on.

2. If the error still occurs after the restart, replace the Main Board.

1. Clean the SCN encoder scale if it is contaminated.

2. Check the cable/FFC of the SCN motor/encoder.

3. Replace the SCN Unit with a new one.

4. Replace the Main Board with a new one.

1. Check that no pieces of paper or foreign objects exist in the paper path.

2. Check the load of the ADF paper feed mechanism.

3. Check the ADF/SCN drive gear wheel train.

4. Clean the SCN encoder scale if it is contaminated.

5. Check the cable/FFC of the SCN motor/encoder.

6. Replace the ADF Unit with a new one.

7. Replace the SCN Unit with a new one.

8. Replace the Main Board with a new one.

Main Board

CN410

---

Main Board

CN410

Main Board

CN410

Troubleshooting Fatal Error Code List 51

Confidential

EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

Error

code

100011 ADF BS+ lock error

100013

100014

100016 HP detection failure

100017

Error name Possible cause Confirmation procedure Connector No.

ADF BS+ excess load error

ADF BS+ driving time error

Contact detection distance exceeded

 The SCN motor did not run

1. The SCN was stopped by;

• Obstacles such as jammed paper

• Overload of the mechanism

• Disengaging or breakage of the gears

 Failed to read the SCN encoder

2. Contamination of the SCN encoder scale

3. Disconnection, break, skew or damage of the SCN motor cable/ encoder FFC

4. Failure of the SCN encoder sensor

5. Failure of the SCN motor (the lead wire is broken or the connector is disconnected)

6. Failure of the Main Board

 The SCN motor stopped running in the middle of the operation

1. The SCN was stopped by;

• Obstacles such as jammed paper

• Overload of the paper feed mechanism

• Disengaging or breakage of the gears

 Failed to read the SCN motor encoder

2. Jumping of the SCN drive gear wheel train

3. Contamination of the SCN encoder scale

4. Failure of the SCN motor (not completely broken)

5. Failure of the Main Board

Malfunction or crash of the firmware

 The SCN CR could not return to its home.

1. Damage or disengaging of Wheel Train of the Drive Mechanism

2. Disengaging, fraying, jumping of the Timing Belt

 Failed to read the white standard/home patterns.

3. Disconnection, break, skew or damage of the SCN FFC

4. Failure of the CIS Unit

5. Failure of the SCN Housing

6. Failure of the Main Board

 The SCN CR cannot completely reach the home (right side).

1. Damage or disengaging of Wheel Train of the Drive Mechanism

 Failure of SCN Encoder reading

2. Damage or skew of the SCN FFC

3. Failure of the CIS Unit

4. Failure of the SCN Housing

5. Failure of the Main Board

1. Check that no pieces of paper or foreign objects exist in the paper path.

2. Check the ADF/SCN drive gear wheel train.

3. Clean the SCN encoder scale if it is contaminated.

4. Check the cable/FFC of the SCN motor/encoder.

5. Replace the ADF Unit with a new one.

6. Replace the SCN Unit with a new one.

7. Replace the Main Board with a new one.

1. Check that no pieces of paper or foreign objects exist in the paper path.

2. Check the load of the ADF paper feed mechanism.

3. Check the ADF/SCN drive gear wheel train.

4. Clean the SCN encoder scale if it is contaminated.

5. Replace the ADF Unit with a new one.

6. Replace the SCN Unit with a new one.

7. Replace the Main Board with a new one.

1. Turn the printer off and back it on.

2. If the error still occurs after the restart, replace the Main Board.

1. Turn the power on with the ADF Unit or the Document Cover opened.

2. Check if the CIS moves to the left to read the white standard/home patterns.

3. Check if the emission color of the CIS is white (not greenish, reddish, or bluish).



If the light does not look like white, check the SCN FFC for damage, disconnection or skew.

4. Replace the SCN Unit with a new one.

5. Replace the Main Board with a new one.

1. Turn the power on with the ADF Unit or the Document Cover opened.

2. Check if the CIS (SCN CR) reaches (comes in contact with) the right side.

3. Check the Wheel Train of the Drive Mechanism for damage.

4. Check the SCN FFC for damage, disconnection or skew.

5. Replace the SCN Unit with a new one.

6. Replace the Main Board with a new one.

Main Board

CN410

Main Board

CN410

---

Main Board

CN409 CN410

Main Board

CN409 CN410

Troubleshooting Fatal Error Code List 52

Confidential

EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

Error

code

100020 Measurement error

100032 LED light failure

100054 Paper jam error

100065

100066 FB PID reverse error

Error name Possible cause Confirmation procedure Connector No.

FB PID excess speed error

 Overload of the SCN Drive Mechanism  Failure of the SCN Motor

 Failure of the CIS LED light (RGB)

1. Disconnection, break, skew or damage of the scanner FFC

2. Failure of the CIS unit

3. Failure of the Main Board

 No jammed paper is remaining but the sensor does not turn off

1. Failure of the ADF PE sensor

2. Failure of the cable

 Jammed paper is remaining  The paper feed rollers and paper conveying rollers slip too much

 At power-on, during paper feed, during scanning

 Failed to read the scanner encoder

1. Contamination of the scanner encoder scale

2. Damage or skew of the scanner FFC

3. Failure of the scanner encoder sensor

 Failure of the scanner motor driver

4. Failure of the Main Board

 Operation failure of the SCN Motor

1. Malfunction of the SCN

 Disengaging of the SCN CR  Disengaging of the SCN Motor Pulley or cracking of the

SCN Motor Gears

 Failure of SCN Encoder reading

2. Contamination of the SCN Encoder

3. Damage or skew of the SCN FFC

4. Failure of the SCN Encoder Sensor

5. Failure of the Main Board

1. Check if the CIS (SCN CR) moves or not. 1-1.Check the Wheel Train of the Drive Mechanism for damage.

2. Replace the SCN Unit with a new one.

3. Replace the Main Board with a new one.

1. Check the color of the LED at power-on.

2. Check the scanner FFC for damage, disconnection or skew.

3. Replace the SCN Unit with a new one.

4. Replace the Main Board with a new one.

1. Open the PGU LD ADF Assy and check if paper exist or not.

2. Open the Document Support ADF and check if paper exist or not.

3. Open the ADF and check if paper exist or not.

4. Check if the paper sensor lever moves up and down.

5. Replace the ADF unit with a new one.

6. Replace the SCN Unit with a new one.

7. Replace the Main Board with a new one.

1. Check the scanner FFC for damage, disconnection or skew.

2. Replace the SCN Unit with a new one.

3. Replace the Main Board with a new one.

1. Check the scanner FFC for damage, disconnection or skew.

2. Replace the SCN Unit with a new one.

3. Replace the Main Board with a new one.

---

Main Board

CN409

Main Board

CN410

Main Board

CN409 CN410

Main Board

CN409 CN410

Troubleshooting Fatal Error Code List 53

Confidential

EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

Error

code

100067 FB PID lock error

100069

100070

100073

100074 FB BS+ reverse error

Error name Possible cause Confirmation procedure Connector No.

FB PID excess load error

FB PID driving time error

FB BS+ excess speed error

 The scanner motor did not run

1. The scanning operation was stopped by;

• Disengaging of the scanner CR

• Disengaging of the scanner motor pulley or cracking of the scanner motor gears

 Failed to read the CR motor encoder

2. Contamination of the scanner encoder

3. Damage or skew of the scanner FFC

4. Failure of the scanner encoder sensor

5. Failure of the scanner motor

6. Failure of the Main Board

 The scanner motor stopped running in the middle of the operation

1. The scanning operation was stopped by;

• Disengaging of the scanner CR

• Disengaging of the scanner motor pulley or cracking of the scanner motor gears

 Failed to read the scanner motor encoder

2. Contamination of the scanner encoder

3. Disconnection, break, skew or damage of the scanner FFC

4. Failure of the scanner encoder sensor

5. Failure of the scanner motor (not completely broken).

6. Failure of the Main Board

Malfunction or crash of the firmware

 Failed to read the scanner encoder

1. Contamination of the scanner encoder scale

2. Damage or skew of the scanner FFC

3. Failure of the scanner encoder sensor

 Failure of the scanner motor driver

4. Failure of the Main Board

 Operation failure of the scanner motor

1. The scanning operation was stopped by;

• Disengaging of the scanner CR

• Disengaging of the scanner motor pulley or cracking of the scanner motor gears

 Failed to read the scanner encoder

2. Contamination of the scanner encoder

3. Damage or skew of the scanner FFC

4. Failure of the scanner encoder sensor

5. Failure of the Main Board

1. Check the scanner FFC for damage, disconnection or skew.

2. Replace the SCN Unit with a new one.

3. Replace the Main Board with a new one.

1. Check the scanner FFC for damage, disconnection or skew.

2. Replace the SCN Unit with a new one.

3. Replace the Main Board with a new one.

1. Turn the printer off and back it on.

2. If the error still occurs after the restart, replace the Main Board.

1. Check the scanner FFC for damage, disconnection or skew.

2. Replace the SCN Unit with a new one.

3. Replace the Main Board with a new one.

1. Check the scanner FFC for damage, disconnection or skew.

2. Replace the SCN Unit with a new one.

3. Replace the Main Board with a new one.

Main Board

CN409 CN410

Main Board

CN409 CN410

---

Main Board

CN409 CN410

Main Board

CN409 CN410

Troubleshooting Fatal Error Code List 54

Confidential

EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

Error

code

100075 FB BS+ lock error

100077

100078

Error name Possible cause Confirmation procedure Connector No.

FB BS+ excess load error

FB BS+ driving time error

 The scanner motor did not run

1. The scanning operation was stopped by;

• Disengaging of the scanner CR

• Disengaging of the scanner motor pulley or cracking of the scanner motor gears

 Failed to read the CR motor encoder

2. Contamination of the scanner encoder

3. Damage or skew of the scanner FFC

4. Failure of the scanner encoder sensor

5. Failure of the scanner motor

6. Failure of the Main Board

 The scanner motor stopped running in the middle of the operation

1. The scanning operation was stopped by;

• Disengaging of the scanner CR

• Disengaging of the scanner motor pulley or cracking of the scanner motor gears

 Failed to read the scanner motor encoder

2. Contamination of the scanner encoder

3. Failure of the scanner motor (not completely broken).

4. Failure of the Main Board

Malfunction or crash of the firmware

1. Check the scanner FFC for damage, disconnection or skew.

2. Replace the SCN Unit with a new one.

3. Replace the Main Board with a new one.

1. Check the scanner FFC for damage, disconnection or skew.

2. Replace the SCN Unit with a new one.

3. Replace the Main Board with a new one.

1. Turn the printer off and back it on.

2. If the error still occurs after the restart, replace the Main Board.

Main Board

CN409 CN410

Main Board

CN409 CN410

---

Troubleshooting Fatal Error Code List 55

Confidential

EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

2.3.2.2 Printer (CR)

Error

code

000020

000021

000022

000023 CR PID reverse error

Error name Possible cause Confirmation procedure Connector No.

CR PID driving time error

CR PID excess load error

CR PID excess speed error

Malfunction or crash of the firmware

 The CR motor stopped running in the middle of the operation

1. The CR was stopped by;

• Obstacles such as jammed paper

• Overload of the mechanism

• Interfere with the ink system

• Disengaging, fraying, jumping of the timing belt

• Crack or disengaging of the gear, or the APG lever interferes with the CR

 Failed to read the CR encoder

2. Contamination of the CR encoder scale

3. Failure of the CR motor (not completely broken)

4. Failure of the Main Board

 Failed to read the CR encoder

1. Contamination of the CR encoder scale

2. Damage or skew of the CR encoder FFC

3. Failure of the CR encoder sensor

 Failure of the CR motor driver

4. Failure of the Main Board

 Operation failure of the CR motor, stopped by obstacles

1. CR was stopped by;

• Obstacles such as jammed paper

• Interfere with the ink system

• Disengaging or breakage of the gears

 Failed to read the CR encoder

2. Jumping of the CR timing belt

3. Contamination of the CR encoder scale

4. Damage or skew of the CR encoder FFC

5. Failure of the CR encoder sensor

6. Failure of the Main Board

1. Turn the printer off and back it on.

2. If the error still occurs after the restart, replace the Main Board.

1. Check that no obstacle exist in the CR motion range.

2. Check the CR lock and ink system for any abnormality.

3. Check the timing belt for fraying or looseness.

4. Check the load applied to the CR by moving it by hand.

5. Check if the lubricant on the CR shaft is adequate.

6. Check the CR drive mechanism.

7. Clean the CR encoder scale if it is contaminated.

8. Replace the CR motor with a new one.

9. Replace the Main Board with a new one.

1. Clean the CR encoder scale if it is contaminated.

2. Check the FFC of the CR encoder.

3. Replace the CR encoder sensor with a new one.

4. Replace the Main Board with a new one.

1. Check that no obstacle exist in the CR motion range.

2. Check the CR lock and ink system for any abnormality.

3. Check the timing belt for fraying or looseness.

4. Clean the CR encoder scale if it is contaminated.

5. Check the CR encoder FFC or the connector.

6. Replace the CR encoder sensor with a new one.

7. Replace the Main Board with a new one.

---

Main Board

CN305 CN303

Main Board

CN305 CN303

Troubleshooting Fatal Error Code List 56

Confidential

EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

Error

code

000024 CR PID lock error

000025 CR PID speed fall error

000030

Error name Possible cause Confirmation procedure Connector No.

CR load position driving time error

 The CR motor did not run, or the CR could not move smoothly

1. Overload of the CR

 Failed to read the CR encoder

2. The timing belt become frayed or jumping

3. Contamination of the CR encoder scale

4. Disconnection, break, skew or damage of the CR encoder FFC

5. Failure of the CR encoder sensor

6. Failure of the CR motor (the lead wire is broken or the connector is disconnected)

7. Failure of the Main Board

 Operation failure of the CR

1. The CR was stopped by;

• Obstacles such as jammed paper

• Overload of the mechanism

• Interfere with the ink system

 Failed to read the CR motor encoder

2. The timing belt become loosened or jumping

3. Contamination of the CR encoder scale

4. Damage or skew of the CR encoder FFC

5. Failure of the CR motor

6. Failure of the Main Board

Malfunction or crash of the firmware

1. Check that no obstacle exist in the CR motion range.

2. Move the CR by hand to see if it moves smoothly without getting stuck.

3. Check the timing belt for fraying or looseness.

4. Clean the CR encoder scale if it is contaminated.

5. Check the connector and the CR encoder FFC for damage.

6. Replace the CR encoder FFC with a new one.

7. Check the connector of the CR motor.

8. Replace the CR motor with a new one.

9. Replace the Main Board with a new one.

1. Check that no obstacle exist in the CR motion range.

2. Check the CR lock and ink system for any abnormality.

3. Check the timing belt for looseness.

4. Clean the CR encoder scale if it is contaminated.

5. Check the connector of the CR encoder FFC.

6. Replace the CR motor with a new one.

7. Replace the Main Board with a new one.

1. Turn the printer off and back it on.

2. If the error still occurs after the restart, replace the Main Board.

Main Board

CN305 CN303

Main Board

CN305 CN303

---

Troubleshooting Fatal Error Code List 57

Confidential

EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

Error

code

000031

000032

000033

Error name Possible cause Confirmation procedure Connector No.

CR load position excess load error

CR load position excess speed error

CR load position reverse error

 The CR motor stopped running in the middle of the operation

1. The CR was stopped by;

• Obstacles such as jammed paper

• Overload of the mechanism

• Interfere with the ink system

• Disengaging or breakage of the gears

• Disengaging, fraying, jumping of the timing belt

 Failed to read the CR encoder

2. Contamination of the CR encoder scale

3. Failure of the CR motor (not completely broken)

4. Failure of the Main Board

 Failed to read the CR encoder

1. Contamination of the CR encoder scale

2. Damage or skew of the CR encoder FFC

3. Failure of the CR encoder sensor

 Failure of the CR motor driver

4. Failure of the Main Board

 Operation failure of the CR motor, stopped by obstacles

1. CR was stopped by;

• Obstacles such as jammed paper

• Overload of the mechanism

• Interfere with the ink system

 Failed to read the CR encoder

2. Jumping of the CR timing belt

3. Contamination of the CR encoder scale

4. Damage or skew of the CR encoder FFC

5. Failure of the CR encoder sensor

6. Failure of the Main Board

1. Check that no obstacle exist in the CR motion range.

2. Check the CR lock and ink system for any abnormality.

3. Check the timing belt for fraying or looseness.

4. Check the load applied to the CR by moving it by hand.

5. Check if the lubricant on the CR shaft is adequate.

6. Check the CR drive mechanism.

7. Clean the CR encoder scale if it is contaminated.

8. Replace the CR motor with a new one.

9. Replace the Main Board with a new one.

1. Clean the CR encoder scale if it is contaminated.

2. Check the FFC of the CR encoder.

3. Replace the CR encoder sensor with a new one.

4. Replace the Main Board with a new one.

1. Check that no obstacle exist in the CR motion range.

2. Check the CR lock and ink system for any abnormality.

3. Check the timing belt for fraying or looseness.

4. Clean the CR encoder scale if it is contaminated.

5. Check the CR encoder FFC or the connector.

6. Replace the CR encoder sensor with a new one.

7. Replace the Main Board with a new one.

Main Board

CN305 CN303

Troubleshooting Fatal Error Code List 58

Confidential

EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

2.3.2.3 Printer (PF)

Error

code

000040

000041 PF PID excess load error

000042

000043 PF PID reverse error

Error name Possible cause Confirmation procedure Connector No.

PF PID driving time error

PF PID excess speed error

Malfunction or crash of the firmware  The PE sensor remains in paper detection status and a paper jam error

occurs instead of causing a fatal error.

 The PF motor stopped running in the middle of the operation

1. The PF was stopped by;

• Obstacles such as jammed paper

• Overload of the paper feed mechanism

• Disengaging or breakage of the gears

 Failed to read the PF motor encoder

2. Contamination of the PF encoder scale

3. Disconnection, break, skew or damage of the PF motor cable/

encoder FFC

4. Failure of the PF motor (not completely broken)

5. Failure of the Main Board

 Failed to read the PF motor encoder

1. Contamination of the PF encoder scale

2. Skew or damage of the PF encoder FFC

3. Failure of the PF encoder sensor

 Failure of the PF motor driver

4. Failure of the Main Board

 Paper feed fails, stopped by obstacles

1. Paper feed was stopped by;

• Obstacles such as jammed paper

• Overload of the paper feed mechanism

• Disengaging or tooth breakage of wheel train of the paper feed mechanism

 Failed to read the PF motor encoder

2. Contamination of the PF encoder scale

3. Skew or damage of the PF encoder FFC

4. Failure of the PF encoder sensor

5. Failure of the Main Board

1. Turn the printer off and back it on.

2. If the error still occurs after the restart, replace the Main Board.

1. Check that no pieces of paper or foreign objects exist in the paper path.

2. Check the load of the paper feed mechanism.

3. Check the wheel train of the PF drive and tooth breakage of the gears.

4. Check the PF encoder scale for damage or contamination.

5. Check the PF encoder FFC or the connector.

6. Replace the PF motor with a new one.

7. Replace the Main Board with a new one.

1. Clean the PF encoder scale if it is contaminated.

2. Check the PF encoder FFC or the connector.

3. Replace the PF encoder sensor with a new one.

4. Replace the Main Board with a new one.

1. Check that no pieces of paper or foreign objects exist in the paper path.

2. Check the load of the paper feed mechanism.

3. Check the wheel train of the PF drive and tooth breakage of the gears.

4. Clean the PF encoder scale if it is contaminated.

5. Check the PF encoder FFC or the connector.

6. Replace the PF encoder sensor with a new one.

7. Replace the Main Board with a new one.

---

Main Board

CN304 CN401

Main Board

CN304 CN401

Troubleshooting Fatal Error Code List 59

Confidential

EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

Error

code

000044 PF PID lock error

000050

000051

000052

000053

Error name Possible cause Confirmation procedure Connector No.

PF load position driving time error

PF load position excess load error

PF load position excess speed error

PF load position reverse error

 The PF motor did not run or obstacles exist in the paper path

1. Overload of the paper feed mechanism

2. The PF timing belt become frayed, jumping, or the wheel train of paper feed mechanism is disengaged or its tooth is broken

 Failed to read the PF motor encoder

3. Contamination of the PF encoder scale

4. Disconnection, break, skew or damage of the PF encoder FFC

5. Failure of the PF encoder sensor

6. Failure of the PF motor (the lead wire is broken or the connector is disconnected)

7. Failure of the Main Board

Malfunction or crash of the firmware

 The PF motor stopped running in the middle of the operation

1. The PF was stopped by;

• Obstacles such as jammed paper

• Overload of the paper feed mechanism

• Disengaging or breakage of the gears

 Failed to read the PF motor encoder

2. Contamination of the PF encoder scale

3. Failure of the PF motor (not completely broken)

4. Failure of the Main Board

 Failed to read the PF motor encoder

1. Contamination of the PF encoder scale

2. Skew or damage of the PF encoder FFC

3. Failure of the PF encoder sensor

 Failure of the PF motor driver

4. Failure of the Main Board

 Paper feed fails, stopped by obstacles

1. Paper feed was stopped by;

• Obstacles such as jammed paper

• Overload of the paper feed mechanism

• Disengaging or tooth breakage of wheel train of the paper feed mechanism

 Failed to read the PF motor encoder

2. Contamination of the PF encoder scale

3. Skew or damage of the PF encoder FFC

4. Failure of the PF encoder sensor

5. Failure of the Main Board

1. Check that no jammed paper exist in the paper path.

2. Check the load of the PF.

3. Check the wheel train of the PF drive and tooth breakage of the gears.

4. Clean the PF encoder scale if it is contaminated.

5. Check the PF encoder FFC or the connector.

6. Replace the PF encoder sensor with a new one.

7. Check the connector of the PF motor.

8. Replace the PF motor with a new one

9. Replace the Main Board with a new one.

1. Turn the printer off and back it on.

2. If the error still occurs after the restart, replace the Main Board.

1. Check that no pieces of paper or foreign objects exist in the paper path.

2. Check the load of the paper feed mechanism.

3. Check the wheel train of the PF drive and tooth breakage of the gears.

4. Clean the PF encoder scale if it is contaminated.

5. Replace the PF motor with a new one

6. Replace the Main Board with a new one.

1. Clean the PF encoder scale if it is contaminated.

2. Check the PF encoder FFC or the connector.

3. Replace the PF encoder sensor with a new one.

4. Replace the Main Board with a new one.

1. Check that no pieces of paper or foreign objects exist in the paper path.

2. Check the load of the paper feed mechanism.

3. Check the wheel train of the PF drive and tooth breakage of the gears.

4. Clean the PF encoder scale if it is contaminated.

5. Check the PF encoder FFC or the connector.

6. Replace the PF encoder sensor with a new one.

7. Replace the Main Board with a new one.

Main Board

CN304 CN401

---

Main Board

CN304 CN401

Main Board

CN304 CN401

Troubleshooting Fatal Error Code List 60

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2.3.2.4 Printer (PW/PE Sensor)

Error

code

030001 PE detector error

030002

030003

Error name Possible cause Confirmation procedure Connector No.

 PE Sensor damage  Failure of the Main Board

 PW Sensor damage

PW sensor light value adjust error

PE sensor light value adjust error

 Failure of the Main Board

 PE Sensor damage  Failure of the Main Board

2.3.2.5 Printer (Power Supply)

Error

code

030005

030006

Error name Possible cause Confirmation procedure Connector No.

P/S internal temperature error (under the lower limit)

*Occurs after paper feed, before start printing

P/S internal temperature error (exceeded the upper limit) *Occurs after paper feed, before start printing

 P/S cable broken/caught.  Failure of a P/S circuit part (thermistor open)  Main Board circuit failure (Failure of the temperature detection

circuit)

 Failure of a P/S circuit part (excess heat)

1. Foreign obstacle entered inside the Power Supply (excess heat by

 Main Board circuit failure

2. Foreign obstacle on the Main Board and/or connectors

3. Failure of the temperature detection circuit

 Occurs when the light value became lower than the threshold

value in light value adjustment.

 Cannot detect paper even the light value was raised to

maximum in light value adjustment.

 Cannot detect paper even the light value was raised to

maximum in light value adjustment.

thermistor short, leakage)

1. Check the PE Sensor for broken cable or unconnected connector.

2. Replace the PE Sensor with a new one.

3. Replace the Main Board with a new one.

1. Check the PW Sensor for broken cable or unconnected connector.

2. Replace the PW Sensor with a new one.

3. Replace the Main Board with a new one.

1. Check the PE Sensor for broken cable or unconnected connector.

2. Replace the PE Sensor with a new one.

3. Replace the Main Board with a new one.

1. Replace the P/S cable with a new one.

2. Replace the P/S Unit with a new one.

3. Replace the Main Board with a new one.

1. Replace the P/S Unit with a new one.

2. Replace the Main Board with a new one.

Main Board

CN402

Main Board

CN303

Main Board

CN402

Main Board

CN604

---

Troubleshooting Fatal Error Code List 61

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2.3.2.6 Printer (Head/CSIC)

Error

code

031001

031002

031003

031004 Head temperature error

031006

031008 VBS overvoltage error

033003 Other Ink device error

033004 Other Ink device error

033005 Other Ink device error

Error name Possible cause Confirmation procedure Connector No.

HeadHot detect error  (pre printing)

HeadHot detect error  (after flushing)

Transistor temperature error

Blowout of a fuse error (Head)

 Disconnection, break, skew or damage of the head FFC  Overheat of the Print Head

1. Failure of the Print Head

2. Failure of the Main Board

 Occurs in-between print passes (after printing one pass and

before printing the next pass)

 Disconnection, break, skew or damage of the head FFC  Overheat of the Print Head

1. Failure of the Print Head

2. Failure of the Main Board

 Occurs every after ink flushing operation

(Flushing before starting printing, flushing after manual cleaning and etc.)

 Since continued overload printing in high temperature, protective

function of the head driven circuit worked.

 Failure of the Main Board

 Occurs after receiving a print job and starting printing

 Disconnection, break, skew or damage of the head FFC

 Occurs after receiving a print job and starting printing

Failure of the thermistor inside the Print Head Temperature around the Print Head is out of the range from -20 to 80 degrees C.

 Failure of the power source for the Print Head

1. Failure of the circuit Disconnection, break, skew, or damage of the head FFC

2. Blowout of fuse on the Main Board Failure of the Print Head  Occurs at power-on, when replacing the ink cartridge, in-

between print passes, and after flushing operation

1. Head FFC failure (skew, foreign object attached)

2. Failure of the head

3. Failure of the Main Board (Occurrence frequency based on past record is 1. > 2. > 3.)

 Error in the printer settings  Failure of the Main Board

 Occurs at power-on

1. Check the head FFC for disconnection, break, skew or damage.

2. Replace the Print Head with a new one.

3. Replace the Main Board with a new one. Main Board CN301

1. Check the head FFC for disconnection, break, skew or damage.

2. Replace the Print Head with a new one.

3. Replace the Main Board with a new one.

Replace the Main Board with a new one.

1. Check the head FFC for disconnection, break, skew or damage.

2. Replace the Print Head with a new one.

3. Replace the Main Board with a new one.

1. If the fuse has not blown out

1) Check the head FFC for disconnection, break, skew or damage.

2. If the fuse has blown out

1) Replace the Main Board with a new one.

3. In the other cases

1) Replace the Print Head with a new one.

1. Check the head FFC.

2. Replace the Print Head with a new one.

3. Replace the Main Board with a new one.

1. Turn the printer off and back it on.

2. If the error still occurs after the restart, replace the Main Board.

Main Board

CN301

---

Main Board

CN301

Main Board

CN301

Main Board

CN301

---

Troubleshooting Fatal Error Code List 62

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2.3.2.7 Printer (Others)

Error

code

034001

034004

060001

060002 Driver mismatch error

Error name Possible cause Confirmation procedure Connector No.

Home position seek error *Since the panel displays “paper jam error”, user do not notice but the error log remains

Paper jam release impossible error

Factor error other than printer device

The carriage does not move

1. Overload of the Carriage Drive Mechanism (paper jam, foreign object)

2. Failure of the Ink system

3. Failure of the CR Motor

4. Failure of the Main Board

 Main Board failure  Something mechanical failure with PF motor.

Depend on user environment

 Non-supported printer driver  Mismatch between custom printer driver and custom printer

2.3.2.8 System Error

Error

code

202620 Wi-Fi Board failure Failure or disconnection of the wireless network board

205102 Card board failure Failure or disconnection of the Card Slot Board Assy

203004 Panel unit failure Failure of the panel unit

Error name Possible cause Confirmation procedure Connector No.

1. Check that no obstacles or paper exist in the carriage motion range.

2. Manually unlock the carriage. (If unlocking is impossible, the problem caused by failure of the Ink system.)

3. Check the load applied to the CR by moving it by hand.

4. Turn the printer on and check if the carriage moves. If it still does not move, the motor is broken or failure of the Main Board.

1. Check the mechanism around PF motor and whether PF motor works normally or not.

2. Replace the PF motor with a new one.

3. Replace the Main Board with a new one.

Customized support ---

Check the OS and the version of the printer driver. ---

1. Check the wireless network board.

2. Check the FFC.

1. Card Slot Board Assy

2. State of the FFC

1. Check the panel unit.

2. Check the FFC.

Main Board

CN304

Main Board

CN202

Main Board

CN203

Main Board

CN207 CN209

---

Troubleshooting Fatal Error Code List 63

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Maintenance SP Mode

Run:[Touch PNL] / Select:[HELP]

1.Printer Inspection Mode

2.Status Sheet Print Mode

3.Touch Screen Calibration

Maintenance SP Mode

Run:[OK] / Select:[UP][DOWN]

1.Printer Inspection Mode

2.Status Sheet Print Mode

Touch Panel 2.4 inch model LCD Model

SW1 SW2 SW3

Power SW

SW1

Power SW

2.4 Service Support Mode

 Overview

Service support mode is a service dedicated special mode that can be started by a special operation from LCD panel, and allows you to execute functions including printer mode, service status sheet, and touch panel adjustment. ET2750/ET-2760/L4160/ST-2000 series are excluded from this mode because they don't have LCD.

 Structure of service support mode menu

Figure 2-2. Service support mode: top menu

2.4.1 Touch Panel 2.4 inch model

Figure 2-3. Panel operation in service support mode

(Touch Panel 2.4 inch model)

 Service Support Mode startup and operating procedures

1. Press the [SW1] and [Power SW] button until the screen switches, starting the printer.

Item Display Explanation When to use

Printer mode Printer Inspection Mode

Service status sheet print (p.67)

Touch panel adjustment

(p.171)

Status Sheet Print Mode

Touch Screen Calibration

Troubleshooting Service Support Mode 64

Allows you to perform adjustment with the ADF/SCN Unit removed.

In addition to the normal status sheet information, you can check information needed for servicing.

Perform the home position adjustment of the touch panel.

When repairing

Troubleshooting

When repairing

Figure 2-4. Service Support Mode startup and operating procedures

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Power SW

SW1

SW2 SW3

UP:[Right] SHIFT:[Left]/FIN:[Center]

*****_

Power SW

2. Operate the Touch Panel, and enter the ID. ID to enter: 61544

 Operating procedure

1. Tap [SW3] until the value necessary for this digit is displayed.

2. Tap [SW1] to enter the value. The value will change to “*”, and the cursor goes to the next digit.

3. Repeat steps 1 and 2 to enter the 5 digit ID.

4. When entry is completed, tap [SW2] to confirm.

2.4.2 LCD Model

 Service Support Mode startup and operating procedures

1. Press the [SW1] and [Power SW] button until the screen switches, starting the printer.

Figure 2-6. Service Support Mode startup and operating procedures

Figure 2-5. Service support mode operation method

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UP:[Right] SHIFT:[Left]/FIN:[Center]

*****_

Input ID is not found!! Please wait Poweroff...

2. Operate the Touch Panel, and enter the ID. ID to enter: 61544

 Operating procedure

1. Press [Up] or [Down] until the value necessary for this digit is displayed.

2. Press [Right] to enter the value. The value will change to “*”, and the cursor goes to the next digit.

3. Repeat steps 1 and 2 to enter the 5 digit ID.

 It is not possible to return to the previous digit after

shifting digits. If you wish to correct the number of the previous digit, proceed with the steps until after step 5 and then perform input again.

 Please note that the execute button is not enabled until at

least two digits have been entered.

Solution if enter and execute the wrong ID

 When a different mode starts:

If you enter the wrong ID and a different mode starts, there is the possibility of changing important settings of the unit, so press the power button to turn off the power immediately and then perform the process again to enter the correct ID number.

 When non-existent ID number:

The following panel LCD display appears and the power is turned off automatically.

Figure 2-7. Service support mode operation method

Troubleshooting Service Support Mode 66

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2.4.3 Status Sheet Information

This section explains about each item printed on the status sheets. The following status sheets can be printed from the printer.

 Overview of Status Sheets

 Printer Information Sheet : printer settings information

 Supply Status Sheet : supported model numbers of consumables or periodic replacement

parts, and the total number of sheets fed into the printer.

 Usage History Sheet : usage history such as the total number of printed pages per function.

 Service Status Sheet : in addition to the information included in the above three sheets, information required for servicing is also provided.

However, the status sheet can be printed only in service support mode. (p.64)

 Status Sheet Items

 Printer information sheet (total pages: 2 sheets)

Item Explanation

Device ID Device ID (product name) is displayed.

Serial Number The serial number of the product is displayed.

MAC Address MAC address of the product is displayed.

Hardware Configuration

<Hardware> Memory Capacity Capacity of the memory inside the product is displayed.

Firmware Version of the firmware is displayed.

Main Firmware Version of the main firmware is displayed.

Network Firmware Version of the NW firmware is displayed.

QPIT Version of the QPIT is displayed.

Troubleshooting Service Support Mode 67

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Item Explanation

Basic settings

Paper cassette Paper source settings

Print settings

Language The current language setting is displayed.

Mute The setting of mute (on/off) is displayed.

Button Press

Error Notice

Receive Completion Notice

Normal

Sleep timer setting

Power Off Settings

Auto Error Solver Whether the auto error resolver options are enabled or not is displayed.

Ink Drying Time The Ink Drying Time when duplex printing is displayed.

PC connection via USB Whether the setting is enabled or not is displayed.

Paper cassette 1

MP tray

A4/Letter Auto Switching Whether the auto switching function is enabled or not is displayed.

Paper Size Notice Whether the setting is enabled or not is displayed.

Paper Type Notice Whether the setting is enabled or not is displayed.

Universal Print Settings

Send Completion Notice

Print Completion Notice

Ring Tone

Receiver

Paper Size Paper size settings for each of the paper sources.

Paper Type Paper type settings for each of the paper sources.

Paper Size Paper size settings of the rear tray is displayed.

Paper Type Paper type settings of the rear tray is displayed.

Top Offset

Left Offset

Top Offset in Back

Left Offset in Back

Check Paper Width Whether the setting is enabled or not is displayed.

Skip Blank Page Whether the setting is enabled or not is displayed.

Sound level setting (0 to 10) is displayed.

Whether the sleep timer is enabled or not is displayed. When enabled, the time period before the product enters sleep mode is also displayed.

Whether the auto power off setting is enabled or not is displayed. When enabled, the time period before the printer automatically turns off is also displayed.

The offset setting (-30 to 30) is displayed.

Troubleshooting Service Support Mode 68

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Item Explanation

Color The color setting (Color or Mono) is displayed.

File Format File format setting is displayed.

Scan area Original document size setting is displayed.

Remove shadow Whether the setting is enabled or not is displayed.

The frame width setting (0 to 40 mm/---(in case of the shadow remove setting is disabled)) is displayed.

The center width setting (0 to 40 mm/---(in case of the shadow remove setting is disabled)) is displayed.

The erasing setting (left edge/right edge/top edge/bottom edge/--- (in case of the remove punch holes setting is disabled)) is displayed.

The erasing amount (0 to 20 mm/--- (in case of the remove punch holes setting is disabled)) is displayed.

Scan settings

Scan to Cloud

Surround

Center

Remove Punch Holes Whether the setting is enabled or not is displayed.

Erasing Position

Erase Amount

Orientation The document orientation setting (portrait or landscape) is displayed.

Document Type The quality setting (Text/Text & Image/Photo) is displayed.

Density The density setting (-4 to 4) is displayed.

Troubleshooting Service Support Mode 69

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 Supply Status Sheet (total pages: 1 sheet)

Item Explanation

Device ID Device ID (product name) is displayed.

Serial Number The serial number of the product is displayed.

MAC Address MAC address of the product is displayed.

Hardware Configuration

Ink Bottle

Supply Status

Maintenance Box Serial Number Manufacturer's serial number of the Maintenance Box is displayed.

<Hardware> Memory Capacity Capacity of the memory inside the product is displayed.

Firmware Version of the firmware is displayed.

Main Firmware Version of the main firmware is displayed.

Black Serial Number Manufacturer's serial number of each of the ink bottle is displayed.

Cyan

Magenta

Yellow

Network Firmware Version of the NW firmware is displayed.

QPIT Version of the QPIT is displayed.

Serial Number Manufacturer's serial number of each of the ink bottle is displayed.

Troubleshooting Service Support Mode 70

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 Usage History Sheet (total pages: 2 sheets)

Item Explanation

Device ID Device ID (product name) is displayed.

Serial Number The serial number of the product is displayed.

MAC Address MAC address of the product is displayed.

Hardware Configuration

Usage History First Time Printing The date and time when the printer printed for the first time is displayed.

Number of Pages

<Hardware> Memory Capacity Capacity of the memory inside the product is displayed.

Firmware Version of the firmware is displayed.

Main Firmware Version of the main firmware is displayed.

<Sorted by Paper Size> (1-sided/2-sided, B&W/Color)

Network Firmware Version of the NW firmware is displayed.

QPIT Version of the QPIT is displayed.

Total Number of Pages The total number of printed pages is displayed.

Total Number of B&W Pages The total number of pages printed in monochrome is displayed.

Total Number of Color Pages The total number of pages printed in color is displayed.

Total Number of 2-Sided Printing Pages The total number of printed 2-sided pages is displayed.

Total Number of 1-Sided Printing Pages The total number of printed one-sided pages is displayed.

A3/Ledger

A4/Letter

B4/Legal

Envelope

Others

The total number of printed pages per paper size is displayed. Detailed count per function (one-sided/2-sided, monochrome/color) is also displayed for each paper size.

Troubleshooting Service Support Mode 71

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Item Explanation

B&W Copy

Color Copy

B&W Fax

Color Fax

B&W Scan

Number of prints

Usage History Scanned page number

Color Scan

B&W Print from Computer or Mobile Device

Color Print from Computer or Mobile Device

B&W Print from Memory Device or Other Functions

Color Print from Memory Device or Other Functions

ESC/P-R

Others

B&W Scan Number of sheets scanned in monochrome.

Color Scan Number of sheets scanned in color.

The total number of printed pages for each of the purposes is displayed.

The version of each of the printer language is displayed.

Troubleshooting Service Support Mode 72

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 Service Status Sheet (total pages: 6 sheets)

Item Explanation

Device ID Device ID (product name) is displayed.

Serial Number The serial number of the product is displayed.

MAC Address MAC address of the product is displayed.

Hardware Configuration

Basic Settings

Paper Source Settings

Print Settings

Network Settings

Paper Cassette

<Hardware> Memory Capacity Capacity of the memory inside the product is displayed.

Firmware Version of the firmware is displayed.

Main Firmware Version of the main firmware is displayed.

Sleep Timer

Power Off Settings

Ink Drying Time The Ink Drying Time when duplex printing is displayed.

Cassette 1/ Rear MP Tray

Universal Print Settings

IP Address

Subnet Mask

Default Gateway

Primary DNS Server

Secondary DNS Server

DNS Domain Name

Proxy Server Settings

Proxy Server

Proxy Server Port Number

Network Firmware Version of the NW firmware is displayed.

QPIT Version of the QPIT is displayed.

Whether the sleep timer is enabled or not is displayed. When enabled, the time period before the product enters sleep mode is also displayed.

Whether the auto power off setting is enabled or not is displayed. When enabled, the time period before the printer automatically turns off is also displayed.

Paper Size Paper size settings for each of the paper sources.

Paper Type Paper type settings for each of the paper sources.

Top Offset

Left Offset

Top Offset in Back

Left Offset in Back

Check Paper Width Whether the setting is enabled or not is displayed.

Skip Blank Page Whether the setting is enabled or not is displayed.

The offset setting (-30 to 30) is displayed.

The network settings are displayed.

Troubleshooting Service Support Mode 73

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Item Explanation

Color Mode The color setting (Color or Mono) is displayed.

File Format File format setting is displayed.

Scan Area Original document size setting is displayed.

Remove Shadow (not provided for “Scan to Cloud”) Whether the setting is enabled or not is displayed.

Surround

Scan settings

Option Settings Fax Function Whether the fax feature is enabled or not is displayed.

Supply Status

Usage History

Scan to Cloud

Ink Bottle

Maintenance Box Serial Number Manufacturer's serial number of the Maintenance Box is displayed.

Remove Punch Holes Whether the setting is enabled or not is displayed.

Orientation (original) The document orientation setting (portrait or landscape) is displayed.

Document Type The quality setting (Text/Text & Image/Photo) is displayed.

Density The density setting (-4 to 4) is displayed.

Black Serial Number Manufacturer's serial number of each of the ink bottle is displayed.

Cyan

Magenta

Yellow

First Time Printing The data and time the printer printed for the first time are displayed.

Center

Erasing Setting

Erase Amount

Serial Number Manufacturer's serial number of each of the ink bottle is displayed.

Total Number of Pages The total number of pages printed by the printer is displayed.

Total Number of B&W Pages The total number of pages printed in monochrome is displayed.

Total Number of Color Pages The total number of pages printed in color is displayed.

The frame width setting (0 to 40 mm/---(in case of the shadow remove setting is disabled)) is displayed.

The center width setting (0 to 40 mm/---(in case of the shadow remove setting is disabled)) is displayed.

The erasing setting (left edge/right edge/top edge/bottom edge/--- (in case of the remove punch holes setting is disabled)) is displayed.

The erasing amount (0 to 20 mm/--- (in case of the remove punch holes setting is disabled)) is displayed.

Troubleshooting Service Support Mode 74

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Item Explanation

A3/Ledger

A4/Letter

B4/Legal

Envelope

Others

B&W Print from Computer or Mobile Device

Color Print from Computer or Mobile Device

B&W Copy

Color Copy

B&W Fax

Color Fax

B&W Print from Memory Device or Other Functions

Color Print from Memory Device or Other Functions

Document Table (Number of pages)

ADF (Number of pages)

ADF (Number of Fed Sheets) The total number of document sheets fed by the ADF is displayed.

Cassette 1/Rear MP Tray The total number of printed pages per paper source is displayed.

The total number of printed pages per paper size is displayed. Detailed count per function (one-sided/2-sided, monochrome/color) is also displayed for each paper size.

The total number of printed pages for each of the purposes is displayed.

The total number of pages scanned on the scanner glass or in the ADF is displayed.

Status of the product (error occurring state) is displayed.

Usage History

Status

<Sorted by Paper Size> (1-sided/2-sided, B&W/Color)

Other The Cumulative number of paper jam The total number of times a paper jam error occurs is displayed.

Number of Sheets Scanned

Number of Sheets Loaded

Printer Error

Scanner Error

Fax Error

Network Error

Other Error

Troubleshooting Service Support Mode 75

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DISASSEMBLY/ASSEMBLY

CHAPTER

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3.1 Overview

This chapter describes procedures for disassembling the main parts/units of ET-4750/ET-4760/L6190/ST-4000 series/ET-3750/ET-3760/L6170/ST-3000 series/ET-3700/ET-3710/L6160 series/ET-2750/ET-2760/L4160/ST-2000 series/ET-2700/L4150 series. Unless otherwise specified, disassembled parts/ units can be reassembled by reversing the disassembly procedure. Disassembly/reassembly precautions and tips are give in

Major Components Disassembly/Assembly Procedure” (p113) and “3.4 Detailed Disassembly/Reassembly Procedure for each Part/Unit” (p142). See

the sections as necessary.

Make sure to read “ Safety Precautions” (p3) before starting work.

When you have to remove units or parts that are not described in this chapter, see the exploded diagrams of SPI (Service Parts Information).

3.1.1 Tools

Use only specified tools to avoid damaging the printer.

Table 3-1. Tools

Name Availability EPSON Part Code

(+) Phillips screwdriver #1

(+) Phillips screwdriver #2 ✓ ---

Flathead screwdriver ✓ ---

Flathead Precision screwdriver #1 ✓ ---

Tweezers ✓ ---

Longnose pliers ✓ ---

Acetate tape --- 1003963

Note 1: “Availability” means that use of a commercially available one is permitted.

2: EPSON provides the tools listed with EPSON part code.

“3.3.4 Repairing

✓

1080530

3.1.2 Jigs

Table 3-2. Jigs

Name Quantity EPSON Part Code

Teflon tape (t = 0.08 mm) 1 1706715

Thickness gauge (1.37 mm) (for μTFP1S head)

Thickness gauge (1.87 mm) (for μTFP1S head)

Thickness gauge (1.45 mm) (for F2 head) 1

Thickness gauge (1.95 mm) (for F2 head) 1

Tube clip 4

Syringe 4

Case for extruding ink 4

Commercially available

Disassembly/Assembly Overview 77

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EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

Front

Right

7 8

Left

Rear

1112

Front

Right

7 8

Left

Rear

1112

3.1.3 Locations of the Parts/Units

This section shows the locations of the main parts/units.

The parts/units which can not be seen in the following pictures are indicated in dotted lines (

 Exterior parts (ET-4750/ET-4760/L6190/ST-4000 series/ET-3750/ET-

3760/L6170/ST-3000 series)

No. Name No. Name

1 ADF/SCN Unit (p100) 7 Housing Right (p98)

2 Cover Tank (p98) 8 Cover Ink Eject (p98)

Ink Tank BK (p100)/

Ink Tank CL (x3) (p100)

4 Panel Unit (p98) 10 Housing Left (p98)

5 Stacker (p98) 11 Duplex Unit (p99)

6 Paper Cassette (p99) 12 Cover Hinge SCN (p98)

Figure 3-1. Exterior Parts (ET-4750/ET-4760/L6190/ST-4000 series/ET-

3750/ET-3760/L6170/ST-3000 series)

Maintenance Box (p98)

 Exterior parts (ET-3700/ET-3710/L6160 series/ET-2750/ET-2760/L4160/

ST-2000 series)

No. Name No. Name

1 SCN Unit (p105) 7 Housing Right (p103)

2 Cover Tank (p103) 8 Cover Ink Eject (p103)

Ink Tank BK (p104)/

Ink Tank CL (x3) (p104)

4 Panel Unit (p103) 10 Housing Left (p103)

5 Stacker (p103) 11 Duplex Unit (p99)

6 Card Slot Assy (p104) 12 Cover Hinge SCN (p103)

Porous Pad Assy (p103)

Figure 3-2. Exterior Parts (ET-2750/ET-2760/L4160/ST-2000 series)

Disassembly/Assembly Overview 78

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EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

Front

Right

Left

Rear

Front

Right

Left

Rear

161517 18

 Exterior parts (ET-2700/L4150 series)

No. Name No. Name

1 SCN Unit (p105) 6 Housing Right (p103)

2 Cover Tank (p103) 7 Cover Ink Eject (p103)

Ink Tank BK (p104)/

Ink Tank CL (x3) (p104)

Porous Pad Assy (p103)

4 Panel Unit (p103) 9 Housing Left (p103)

5 Stacker (p103) 10 Cover Hinge SCN (p103)

Figure 3-3. Exterior Parts (ET-2700/L4150 series)

 Printer mechanism(ET-4750/ET-4760/L6190/ST-4000 series/ET-3750/

ET-3760/L6170/ST-3000 series

No. Name No. Name

Main Frame Assy (p101)

2 CR Scale & Spring (p100) 11 Fax Box (p98)

3 Cover CR (p99) 12 P/S Unit (p98)

4 Print Head (p99) 13 PF Encoder (p98)

5 Paper Guide Front Assy (p98) 14 PF Scale (p98)

6 Paper Guide Lower Porous Pad (p98) 15 CR Motor (p101)

7 SCN Hinge (p100) 16 Paper Guide Upper Right (p101)

8 CR Unit (p101) 17 Paper Guide Upper Left (p101)

9 Ink System (p100) 18 Main Board (p101)

ET-3700/ET-3710/L6160 series)

Ink Tank BK (p100)/

Ink Tank CL (x3) (p100)

Figure 3-4. Printer Mechanism

(ET-4750/ET-4760/L6190/ST-4000 series/ET-3750/ET-3760/L6170/ST-

3000 series/ET-3700/ET-3710/L6160 series)

Disassembly/Assembly Overview 79

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Front

Right

Left

Rear

 Printer mechanism (ET-2750/ET-2760/L4160/ST-2000 series/ET-2700/

Figure 3-5. Printer Mechanism

L4150 series)

No. Name No. Name

1 Frame ASF Rear Assy (p107) 11 P/S Unit (p103)

2 CR Scale & Spring (p104) 12 PF Encoder (p103)

3 Cover CR (p104) 13 PF Scale (p103)

4 Print Head (p104) 14 Card Slot Assy (p104)

5 Paper Guide Front Assy (p103) 15 CR Motor (p106)

Paper Guide Lower Porous Pad

(p103)

SCN Hinge (p105)

8 CR Unit (p106) 18 Paper Guide Upper Right (p107)

9 Ink System (p105) 19 Paper Guide Upper Left (p107)

Ink Tank BK (p104)/ Ink Tank CL (x3) (p104)

Shaft LD Rear Assy (p105)

Paper Set Detection Sensor Assy

(p105)

Main Board (p106)

Disassembly/Assembly Overview 80

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3.1.4 Standard Operation Time for Servicing the Product

The following are the standard operation time for servicing the product. This standard operation time was determined based on the MTTR result measured using the prototype of 2760/L4160/ST-2000 series

The underlined parts/units are supplied as After Service Parts.

 ET-4750/ET-4760/L6190/ST-4000 series/ET-3750/ET-3760/L6170/ST-

3000 series/ET-3700/ET-3710/L6160 series

Table 3-3. Standard Operation Time (ET-4750/ET-4760/L6190/ST-4000 series/

ET-3750/ET-3760/L6170/ST-3000 series/ET-3700/ET-3710/L6160 series)

Parts/Unit

Duplex unit 0:04 3:54 3:58

Housing Upper Front 1:05 1:05

Cover Ink Eject 0:27 0:27

Maintenance Box 0:33 0:33

Pick up Roller Assy. 0:21 0:21

Stacker 0:12 0:12

Cover Cable Head 0:16 0:16

Cap Hinge Tank 0:04 0:04

Cap Tank 0:08 0:08

Cover Hinge SCN 0:14 0:14

Paper Guide Front Assy 0:49 1:40 2:29

Paper Guide Lower Porous Pad 0:58 0:02 1:00

ADF Document Support Cover 0:14 0:14

ADF Stacker Assy 0:27 0:27

PGU LD ADF Assy 0:28 0:28

Frame Upper ADF Assy 1:20 1:20

ET-4750/ET-4760/L6190/ST-4000 series/ET-2750/ET-

/ET-2750/ET-2760/L4160/ST-2000 series.

Time (in units of seconds)

Replacement

Adjustment/

inspection

Total

Table 3-3. Standard Operation Time (ET-4750/ET-4760/L6190/ST-4000 series/

ET-3750/ET-3760/L6170/ST-3000 series/ET-3700/ET-3710/L6160 series)

Time (in units of seconds)

Parts/Unit

Replacement

ADF PAD Assy 1:55 1:55

ADF PAD Spring 1:55 1:55

ADF Document Support 0:10 0:10

Document Mat 0:16 0:16

Cover CR 0:33 0:33

Adapter (CL) (x3) 1:37 1:37

Adapter (BK) 0:56 0:56

Sheet Guide Tube 1:26 1:26

Adapter Tube 3:12 3:12

Holder Board 2:15 2:15

Paper Cassette 0:11 2:14 2:25

Print Head 3:23 17:04 20:27

Cover Tank 1:11 1:11

Pressing Plate Tube 1:15 1:15

Guide Tube Supply Ink 2nd 3:08 3:08

Star Wheel Holder Assy 3:34 1:40 5:14

Housing Left 1:33 1:33

PF Scale 1:48 1:48

PF Encoder 2:19 2:19

Frame Main Support 2:30 2:30

Holder Core Fax 7:45 7:45

Fax Box 3:41 3:41

P/S Unit 3:04 1:18 4:22

ASF Bank Assy 5:07 2:14 7:21

Panel Unit 6:32 0:12 6:44

Adjustment/

inspection

Total

Disassembly/Assembly Overview 81

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Table 3-3. Standard Operation Time (ET-4750/ET-4760/L6190/ST-4000 series/

ET-3750/ET-3760/L6170/ST-3000 series/ET-3700/ET-3710/L6160 series)

Time (in units of seconds)

Parts/Unit

Housing Right 2:04 2:04

Ink System 3:04 3:04

Holder Connector CSIC IS Assy 3:51 3:51

Holder Cable CSIC Ink Eject 3:51 3:51

Holder Housing Ink Eject

I/S transmission Gear 3:08 3:08

Ink Eject CSIC FFC 4:32 4:32

CR Scale & Spring 2:56 2:56

Holder Scale CR 3:16 3:16

Housing Front 3:38 3:38

Key Slot Assy 4:30 4:30

Tank Cover Sensor 5:02 5:02

Base Right Support 5:05 5:05

Tank Upper Porous Pad 5:09 5:09

Ink Tank BK 6:09 6:09

Ink Tank CL (x3) 7:49 7:49

Housing Upper Rear 2:34 2:34

SCN Hinge 3:55 3:55

Holder Damper SC 4:01 4:01

Rack Damper SC 4:01 4:01

SCN Lock Boss 4:02 4:02

ADF/SCN Unit 4:07 4:07

ADF Unit 4:52 4:52

Scanner Unit 4:52 0:49 5:41

Main Board 7:36 11:11 18:47

Replacement

4:09 4:09

Adjustment/

inspection

Total

Table 3-3. Standard Operation Time (ET-4750/ET-4760/L6190/ST-4000 series/

ET-3750/ET-3760/L6170/ST-3000 series/ET-3700/ET-3710/L6160 series)

Time (in units of seconds)

Parts/Unit

Cover Transistor 7:54 7:54

Heat Conduction Sheet 7:40 7:40

Wi-Fi Board 4:19 4:19

Paper Guide Dup Front 5:00 5:00

Paper Guide Upper Left 8:30 1:40 10:10

Paper Guide Upper Right 9:30 1:40 11:10

PE Sensor Assy 10:19 3:04 13:23

PE Sensor 10:45 3:04 13:49

PE Sensor Holder 10:45 10:45

PF Roller 11:25 2:01 13:26

Ink Eject FFC Plate 5:25 5:25

CR Driven Pulley 15:11 15:11

Main Frame Assy 16:14 8:56 25:10

CR Motor 17:01 3:25 20:26

Holder Cam Assy 16:47 16:47

Slider Trans & Spring 16:26 16:26

Spur Gear 17.6 16:18 16:18

Compression Spring Transmission

CR Unit 17:31 6:28 23:59

PW Sensor 17:59 2:34 20:33

CR Encoder 18:10 18:10

CR Timing Belt 17:44 17:44

Head FFC 18:01 18:01

Head Grounding Plate 18:03 2:14 20:17

Replacement

16:18 16:18

Adjustment/

inspection

Total

Disassembly/Assembly Overview 82

Confidential

EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

Table 3-3. Standard Operation Time (ET-4750/ET-4760/L6190/ST-4000 series/

ET-3750/ET-3760/L6170/ST-3000 series/ET-3700/ET-3710/L6160 series)

Time (in units of seconds)

Parts/Unit

Main Frame 18:03 18:03

Frame Base Assy 16:14 16:14

Cover Porous Pad Rear 16:20 16:20

Paper Guide Lower Porous Pad D

Porous Pad Frame Cover 17:02 17:02

Paper Guide Lower Porous Pad B & C

EJ Roller Assy 17:12 1:40 18:52

PF Motor Assy 18:49 0:13 19:02

Frame Center Support 18:13 18:13

Paper Guide Lower Porous Pad Bend

Center Support 18:13 18:13

Square Nut 16:21 16:21

Replacement

16:24 0:02 16:26

17:06 0:02 17:08

18:21 18:21

Adjustment/

inspection

Total

 ET-2750/ET-2760/L4160/ST-2000 series

Table 3-4. Standard Operation Time (ET-2750/ET-2760/L4160/ST-2000 series)

Time

Parts/Unit

Replacement

Duplex unit 0:04 3:47 3:51

Housing Upper Front 1:05 1:05

Cover Ink Eject 0:26 0:26

Porous Pad Assy 0:48 0:48

Stacker 0:12 0:12

Cover Cable Head 0:16 0:16

Cap Hinge Tank 0:04 0:04

Cap Tank 0:08 0:08

Cover Hinge SCN 0:14 0:14

Paper Guide Front Assy 0:49 1:51 2:40

Paper Guide Lower Porous Pad 0:58 0:02 1:00

Cover Document Assy 0:06 0:06

Document Mat 0:16 0:16

Cover Rear ASF Assy 0:04 0:04

Cover CR 0:33 0:33

Adapter (CL) (x3) 1:37 1:37

Adapter (BK) 0:56 0:56

Sheet Guide Tube 1:26 1:26

Adapter Tube 3:12 3:12

Holder Board 2:15 2:15

Print Head 3:23 16:49 20:12

Housing Right 2:19 2:19

Cover Tank 1:11 1:11

Pressing Plate Tube 1:15 1:15

Adjustment/

inspection

Total

Disassembly/Assembly Overview 83

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EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

Table 3-4. Standard Operation Time (ET-2750/ET-2760/L4160/ST-2000 series)

Time

Parts/Unit

Guide Tube Supply Ink 2nd

Star Wheel Holder Assy 3:34 1:51 5:25

Housing Left 1:33 1:33

PF Scale 1:48 1:48

PF Encoder 2:19 2:19

Frame Main Support 2:30 2:30

P/S Unit 2:55 1:25 4:20

Holder Core Card Slot 6:59 6:59

CR Scale & Spring 3:11 3:11

Holder Scale CR 3:31 3:31

Ink System 3:19 3:19

I/S transmission Gear 3:23 3:23

Panel Unit 4:04 4:04

Housing Front 4:38 4:38

Card Slot Assy 5:47 5:47

Key Slot Assy 5:30 5:30

Base Right Support 6:05 6:05

Tank Upper Porous Pad 6:09 6:09

Ink Tank BK 7:09 7:09

Ink Tank CL (x3) 8:49 8:49

Housing Upper Rear 3:17 3:17

SCN Hinge 4:38 4:38

Holder Damper SC 4:44 4:44

Rack Damper SC 4:44 4:44

SCN Lock Boss 4:45 4:45

Replacement

3:08 3:08

Adjustment/

inspection

Total

Table 3-4. Standard Operation Time (ET-2750/ET-2760/L4160/ST-2000 series)

Time

Parts/Unit

SCN Unit 4:45 0:49 5:34

Main Board 8:14 11:35 19:49

Cover Transistor 8:32 8:32

Heat Conduction Sheet 8:18 8:18

Wi-Fi Board 4:57 4:57

Paper Set Detection Sensor Assy 5:34 3:47 9:21

Paper Set Detection Sensor Board

Paper Set Detection Sensor Lever

Paper Set Detection Sensor FFC

Sheet Stopper 5:45 5:45

Shaft LD Rear Assy 6:28 3:47 10:15

Holder Clutch Assy 6:37 6:37

Clutch Assy 6:05 6:05

Spur Gear Clutch 45.6 6:10 6:10

Extension Spring 0.137 5:51 5:51

Paper Guide Upper Right Spring 7:26 7:26

Frame ASF Rear Assy 7:37 3:47 11:24

PE Sensor Assy 8:26 2:14 10:40

PE Sensor 8:52 2:14 11:06

PE Sensor Holder 8:52 8:52

Paper Guide Upper Left Spring 9:43 9:43

Paper Guide Upper Left 13:13 1:51 15:04

Paper Guide Upper Right 15:11 1:51 17:02

Replacement

6:07 6:07

5:59 5:59

6:04 6:04

Adjustment/

inspection

Total

Disassembly/Assembly Overview 84

Confidential

EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

Table 3-4. Standard Operation Time (ET-2750/ET-2760/L4160/ST-2000 series)

Time

Parts/Unit

PF Roller 15:08 2:10 17:18

CR Driven Pully 14:48 14:48

Main Frame Assy 15:51 8:18 24:09

CR Motor 16:38 3:28 20:06

Holder Cam Assy 16:24 16:24

Slider Trans & Spring 16:03 16:03

Spur Gear 17.6 15:55 15:55

Compression Spring Transmission

CR Unit 17:08 6:09 23:17

PW Sensor 17:36 2:14 19:50

CR Encoder 17:47 17:47

CR Timing Belt 17:21 17:21

Head FFC 17:38 17:38

Head Grounding Plate 17:40 1:56 19:36

Main Frame 17:40 17:40

Frame Base Assy 15:51 15:51

Frame Cover Porous Pad

EJ Roller Assy 16:49 1:51 18:40

Frame Ground 22:10 22:10

PF Motor Assy 22:50 0:18 23:08

Change Lever 16:04 16:04

Square Nut 15:58 15:58

Replacement

15:59 15:59

16:39 16:39

Adjustment/

inspection

Total

 ET-2700/L4150 series

Table 3-5. Standard Operation Time (ET-2700/L4150 series)

Time

Parts/Unit

Replacement

Housing Upper Front 0:30 0:30

Cover Ink Eject 0:26 0:26

Porous Pad Assy 0:48 0:48

Stacker 0:12 0:12

Pick up Roller Assy 0:21 0:21

Cover Cable Head 0:16 0:16

Cap Hinge Tank 0:04 0:04

Cap Tank 0:08 0:08

Cover Hinge SCN 0:14 0:14

Paper Guide Front Assy 0:49 1:51 2:40

Paper Guide Lower Porous Pad 0:58 0:02 1:00

Cover Document Assy 0:06 0:06

Document Mat 0:16 0:16

Cover Rear ASF Assy 0:04 0:04

Cover CR 0:33 0:33

Adapter (CL) (x3) 1:37 1:37

Adapter (BK) 0:56 0:56

Sheet Guide Tube 1:26 1:26

Adapter Tube 3:12 3:12

Holder Board 2:15 2:15

Print Head 3:23 16:49 20:12

Housing Right 1:44 1:44

Cover Tank 0:36 0:36

Pressing Plate Tube 0:40 0:40

Adjustment/

inspection

Total

Disassembly/Assembly Overview 85

Confidential

EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

Table 3-5. Standard Operation Time (ET-2700/L4150 series)

Time

Parts/Unit

Guide Tube Supply Ink 2nd

Star Wheel Holder Assy 2:59 1:51 4:50

Housing Left 0:58 0:58

PF Scale 1:13 1:13

PF Encoder 1:44 1:44

Frame Main Support 1:55 1:55

P/S Unit 2:20 1:25 3:45

Holder Core Card Slot 6:24 6:24

CR Scale & Spring 2:36 2:36

Holder Scale CR 2:56 2:56

Ink System 2:44 2:44

I/S transmission Gear 2:48 2:48

Housing Front 4:37 4:37

Panel Unit 4:58 4:58

Key Slot Assy 5:29 5:29

Base Right Support 6:04 6:04

Tank Upper Porous Pad 6:08 6:08

Ink Tank BK 7:08 7:08

Ink Tank CL (x3) 8:48 8:48

Housing Upper Rear 2:42 2:42

Housing Rear Assy. 2:45 2:45

Holder Lever MA 2:58 2:58

Paper Support 2:58 2:58

SCN Hinge 4:03 4:03

Holder Damper SC 4:09 4:09

Replacement

2:33 2:33

Adjustment/

inspection

Total

Table 3-5. Standard Operation Time (ET-2700/L4150 series)

Time

Parts/Unit

Rack Damper SC 4:09 4:09

SCN Lock Boss 4:10 4:10

SCN Unit 4:10 0:49 4:59

Main Board 7:39 11:35 19:14

Cover Transistor 7:57 7:57

Heat Conduction Sheet 7:43 7:43

Wi-Fi Board 4:22 4:22

Paper Set Detection Sensor Assy 4:59 3:47 8:46

Paper Set Detection Sensor Lever

Sheet Stopper 5:10 5:10

Shaft LD Rear Assy 5:53 3:47 9:40

Holder Clutch Assy 6:02 6:02

Clutch Assy 5:30 5:30

Spur Gear Clutch 45.6 5:35 5:35

Extension Spring 0.137 5:16 5:16

Paper Guide Upper Right Spring 6:51 6:51

Frame ASF Rear Assy 7:02 3:47 10:49

PE Sensor Assy 7:51 2:14 10:05

PE Sensor 8:17 2:14 10:31

PE Sensor Holder 8:17 8:17

Paper Guide Upper Left Spring 9:08 9:08

Paper Guide Upper Left 12:38 1:51 14:29

Paper Guide Upper Right 14:36 1:51 16:27

PF Roller 14:33 2:10 16:43

CR Driven Pully 14:13 14:13

Replacement

5:24 5:24

Adjustment/

inspection

Total

Disassembly/Assembly Overview 86

Confidential

EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

Air hole

breathable film

Table 3-5. Standard Operation Time (ET-2700/L4150 series)

Time

Parts/Unit

Main Frame Assy 15:16 8:18 23:34

CR Motor 16:03 3:28 19:31

Holder Cam Assy 15:49 15:49

Slider Trans & Spring 15:28 15:28

Spur Gear 17.6 15:20 15:20

Compression Spring Transmission

CR Unit 16:33 6:09 22:42

PW Sensor 17:01 2:14 19:15

CR Encoder 17:12 17:12

CR Timing Belt 16:46 16:46

Head FFC 17:03 17:03

Head Grounding Plate 17:05 1:56 19:01

Main Frame 17:05 17:05

Frame Base Assy 15:16 15:16

Frame Cover Porous Pad

EJ Roller Assy 16:14 1:51 18:05

Frame Ground 21:35 21:35

PF Motor Assy 22:15 0:18 22:33

Change Lever 15:29 15:29

Square Nut 15:23 15:23

Replacement

15:24 15:24

16:04 16:04

Adjustment/

inspection

Total

3.1.5 Checks and Precautions before Disassembling

3.1.5.1 Factors which Affect the Print Quality

WETTING OF VENTILATION FILM

The film under sealing film attached on the Ink Tank is breathable film. The air in the ink tank is released to outside through this film and then the air hole to keep ink supply to the Print Head stable. If the film gets wet with ink, the air in the tank is not properly released outside and may cause degradation in print quality.

Figure 3-6. Breathable film/air hole

Disassembly/Assembly Overview 87

Confidential

EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

breathable film

Hard to notice by seeing the surface Cyan ink soiled

 Determining whether the breathable film is wet or not

When the breathable film is wet, tank replacement is necessary. Because it is hard to notice that the film is wet just by visually checking its surface, determine that according to whether the ink has reached to a certain portion of the air chamber.

When the ink has reached the red squared part of the air chamber shown below, breathable film is probably wet. In this case, replace the Ink Tank.

DIFFERENT TYPE OF INK MIXED IN INK TANK

From the specification of the CISS models, different type/color of ink may get mixed by mistaking the ink injection place. If there is a problem in printing result, the cause may be ink mixture, refer the following to handle the problem.

Mixture of different type/color of the ink is state as follows.

Different type: pigment black ink and dye color ink mixed

 The head nozzles may get clogged with solidified ink

particles.

Different color: dye color inks mixed.

 A print quality problem will occur, but ink

solidification will not occur.

It is recommended to remove the user's Maintenance Box/ Porous Pad Assy when performing the ink tube refresh because it consumes a lot of ink.

The powerful cleaning in the adjustment program corresponds to the ink tube refresh. Select “not to count up the waste ink counter” to prevent a mismatch between the program's waste ink counter and the counter of the user's Porous Pad Assy.*

Note "*" : If you do not select the option, the waste ink counter will count up during

the ink tube refresh.

Figure 3-7. Wetting of breathable film

Disassembly/Assembly Overview 88

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Ink Tank

Adapter tube

Adapter

 How to deal with mixture of different type/color ink

When the ink got mixed, it is necessary to clean the CISS mechanism (from the Ink Tank to the Adapter).

There are the following two methods.

 Replace the CISS mechanism

1. Replace the CISS mechanism

2. Remove the user’s Maintenance Box/Porous Pad Assy and attach the Porous Pad for jigs.

3. To clean the head, inject CR02 into the tank.

4. Start “head cleaning” or “ink refill”, select “not to count up the waste ink counter”, then perform the ink tube refresh. 4760/L6190/ST-4000 series

/ET-3750/ET-3760/L6170/ST-3000 series/

*For ET-4750/ET-

ET-3700/ET-3710/L6160 series, cleaning without counting up the waste ink counter is available only in the service support mode.

5. After each ink tube refresh, print a page to see if a blank page is printed (printed only with CR02). Repeat ink tube refresh until you get a blank page print.

6. Eject CR02 from the Ink Tank and fill the tank with new ink.

7. Perform the ink tube refresh again, and then check that the print quality has been recovered.

 Cleaning inside the ink path (reusing the CISS mechanism)

1. Eject the ink inside the Ink Tank/ink tube.

2. Inject CR02 into the Tank to clean the head and the CISS mechanism.

3. Start the adjustment program, select “not to count up the waste ink counter”, then repeat ink tube cleaning.

4. Start “head cleaning” or “ink refill”, select “not to count up the waste ink counter”, then repeat the ink tube refresh.* L6190/ST-4000 series 3700/ET-3710/L6160 series

/ET-3750/ET-3760/L6170/ST-3000 series/ET-

, cleaning without counting up the waste

ink counter is available only in the service support mode.

For ET-4750/ET-4760/

5. Eject CR02 from the Ink Tank and fill the tank with new ink.

6. Perform the ink tube refresh again, and then check that the print quality has been recovered.

3.1.5.2 Minimizing Ink Leakage during Disassembly for Your Safety

Ink leakage may occur when removing ink-related parts from the printer.  This section describes the parts that may cause ink leakage and how to prevent or minimize the leakage.

When the printer get soiled by the ink leakage, wipe the ink with a cloth wet with CR02. Do not use alcohol to the parts that touch the ink such as tube connecting part and adapter.

THE PARTS THAT MAY CAUSE INK LEAKAGE WHEN REMOVING

Parts name* When ink leakage may occur Location

Ink Tank Removing the adapter tube from the Ink

Tank.

Adapter Removing the adapter tube from the

adapter.

Adapter tube

Note "*" : These parts are indicated with the icon in disassembly/reassembly flowchart. (see

" 3.3.3 Disassembly Flowchart (p97) ")

• Removing the adapter tube from the Ink Tank.

• Removing the adapter tube from the adapter.

Figure 3-8. The Parts That May Cause Ink Leakage

A, B

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Carriage

Adapter

Film

Connector

Cloth

Tube clip

HOW TO MINIMIZE THE INK LEAKAGE

Before disassembling, check the following methods.

 Removing adapter from the carriage

Before disconnecting the joint parts of the ink path, make sure to remove the Adapter from the Carriage.

 Disconnecting the Adapter and the Adapter Tube

Be careful not to press the film portion of the Adapter since doing so may cause ink to leak. Hold the Adapter by its plastic portion when disconnecting the Adapter tube.

In addition, before disconnecting the tube, pinch it with the tube clip and cover the tube end with a cloth to minimize ink leakage.

 To ol s n e ed ed

 Tube clip  Cloth

Figure 3-9. Ink leakage from adapter

Figure 3-10. Disconnecting adapter and adapter tube (1)

Disassembly/Assembly Overview 90

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Adapter

Cotton swab

Cloth

When removing the adapter tube from the adapter in the procedure given below, ink may leak from the adapter tube. Perform disconnection off the printer and be careful not to soil printer and things around.

1. Pinch the adapter tube with a tube clip and remove it from the adapter.

2. To prevent ink leakage, plug a cotton swab into the tip of the adapter tube.

3. Remove the tube clip from the adapter tube.

4. Repeat Step 1 to Step 3 until all four adapter tubes are removed.

Figure 3-11. Disconnecting adapter and adapter tube (2)

Disassembly/Assembly Overview 91

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Cap Hinge Tank

Syringe

Adapter

3.1.5.3 Ink Discharging Procedure

Before removing the Ink Tank, discharge the ink in the procedure given below if necessary.

1. Disconnect the adapter from the printhead. (p 90)

2. Connect any syringe (standard: tip of the syringe = Φ3.2mm, capacity = 50 mL) to the disconnected adapter.

3. Open the Cap Hinge Tank.

4. Suck out the ink inside the Ink Tank with the connected syringe.

Figure 3-13. Ink discharging (2)

5. Repeat Step 1 to Step 4 for each color.

Figure 3-12. Ink discharging (1)

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Housing Upper Rear

Main Frame Assy

Main Board

Holder Core Fax

4.2.

3.2 Common Cautions on Disassembly/Reassembly

This section describes common cautions when disassembling/reassembling the product.

Before disassembling/reassembling a printer including this product, be sure to

Safety Precautions(P3) and this section.

read

Item Content Photo/Illustration

When handling parts

When reassembling

When applying grease

External parts

Moving parts

1. When handling new parts for replacement, take care not to contaminate or damage them.

2. Take care not to damage the FFCs/cables/Ink tube if there is a possibility of coming into contact with them.

3. When reassembling the product, take care not to let components of the unit come off.

Take care not to damage them when securing them by tightening screws.

Do not lubricate any part other than those specified. If grease is applied on such a part, wipe it off completely.

Confirm visually that there are no scratches, dirt, and gaps.

After reassembling, confirm that there are no abnormal noises and they work smoothly.

---

Item Content Photo/Illustration

Timing belts 1. Take care not to break them.

2. Confirm that it is installed properly onto the transmissive sections of the pinion gear/ driven roller.

Motors Take care not to damage the

pinion gears.

Sensors 1. Take care not to touch the

detector sections.

2. As for the encoder Sensor used with a circular scale, the photo sensor section should be set over the encoded area of the circular scale.

3. Take care not to get injured by the sharp ends of the board terminal on the back of the circuit boards when handling the sensors or the peripheral parts.

Scales 1. Take care not to touch the

encoded area.

2. Install it with the black section up. (CR Scale only)

3. Wipe the scale with alcohol before installing. (CR Scale only)

4. Confirm that they do not touch the photo sensors after installation.

---

Disassembly/Assembly Common Cautions on Disassembly/Reassembly 93

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FFC

strengthen plate

SCN Hinge

Holder Cam AssySlider Trans

Dowel

groove

Item Content Photo/Illustration

Waste ink pads

1. Take care not to stain your hands with the waste ink soaked in the ink pads. If ink comes into contact with your hands, wash it off with water immediately.

2. Take care not to stain the printer's parts with the waste ink soaked in the ink pads. If ink comes into contact with the parts, wash it off. (Especially, pay attention to Paper Guide Front/Lower Porous Pad)

FFCs 1. Be sure to insert them to their

connectors on the boards as far as they will go without any loose connection such as a half-way or slant connection.

2. Route them along their routing paths.

3. If the double-sided tape that secures the FFCs is not strong enough to secure them, make sure to replace the tape and secure the FFCs firmly.

4. When connecting to the connector, be careful not to break the strengthen plate on the backside of the terminal of the FFC.

Item Content Photo/Illustration

Gears When installing gears, pay

attention to the following:

• The gear section should not be damaged.

• No foreign material is

---

attached.

• No grease is attached on any parts other than those specified.

Paper feed rollers

One Time parts

Do not touch rollers for paper feeding when handling them.

After removing One Time parts specified in this manual, do not reuse them, but be sure to replace

One Time icon:

them with new ones.

ADF/ Scanner Unit

When removing the screw that secures the ADF/Scanner hinge, make sure to grasp the ADF/ Scanner Unit with your hand to prevent the unit from falling down and getting damaged. Because the dowel attached to the unit and the hinge easily comes off with the screw removed.

Holder Cam Assy

Align the dowel on the Slider Trans with the groove on the Holder Cam Assy and attach them.

Disassembly/Assembly Common Cautions on Disassembly/Reassembly 94

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Housing Upper Front

Duplex Unit

Item Content Photo/Illustration

Ink System 1. Take care not to stain your

hands with ink.

2. When you connect the ink tube to another part, insert the ink tube up to the root of the

MAC Address Label

joint to prevent ink leakage and secure the tube with the tube clamp.

3. If it's hard to insert the ink tube to the joint, apply CR02 to the inserting part of the ink tube.

1. Take care not to stain or damage it.

2. When replacing the printer mechanism, make sure to install the existing Main Board and the part with the MAC address label (Housing Upper Front) to the new printer mechanism.

---

3.3 Disassembly/Reassembly Procedures

3.3.1 Parts/Components Need to be Removed Before Disassembly/Reassembly

In " 3.3.3 Disassembly Flowchart (p97) ", the procedures are indicated on the premise that some parts/units are removed in advance. Make sure to remove the following parts/units before starting disassembly.

 Duplex Unit

Figure 3-14. Removing the Duplex Unit

Disassembly/Assembly Disassembly/Reassembly Procedures 95

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3.3.2 Functional differences between models and component parts

The products described in this manual employ the same printer mechanism, however, because of the functional differences, there are some structural differences between them.

The table below describes the differences.

Table 3-6. Function List According to Models

Function

Panel Touch Panel 2.4 inch LCD 2.4 inch LCD 1.44 inch No LCD

ADF

Scanner

Print Head μTFP1S F2

Paper loading Front loading Rear loading

Duplex Unit

Fax

Wi-Fi

Ethernet

Card Slot

Maintenance Box Replaceable by user Not replaceable by user

Disassembly Flowchart Start Position P.98 P.103 P.108

ET-4750/ET-4760/L6190/

ST-4000 series

✓

✓ ✓ ✓ ✓

✓

✓ ✓ ✓

--- --- ---

ET-3750/ET-3760/L6170/

ST-3000 series

✓

✓ ✓ ✓ ✓

--- --- --- ---

✓ ✓ ✓ ✓

ET-3700/ET-3710/L6160

series

--- --- ---

ET-2750/ET-2760/L4160/

ST-2000 series

--- ---

✓

ET-2700/L4150 series

---

Disassembly/Assembly Disassembly/Reassembly Procedures 96

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CR Driven

Pulley

---

CR Motor

---

(p 22)

Main Frame

Assy

---

(p 21) (p 27)

Reference page

Upper Cover

Assy (p20)

The name enclosed in gray indicate a part/unit that must be removed on the way to the target parts.

Shows necessary procedures before removing the following parts.*

Can be removed/installed as unit or Assy.

Note "*" : The boxes with only part names indicates the removal of such parts. If the names of

FFCs or cables are shown, disconnect the FFCs or cables from their connectors.

Indicates screw type and tightening torque that are defined in the list shown at the lower right of the page.

White letters indicates a part/unit supplied as an ASP.

Item Description Reference

Parts/unit name

Whiteletter

Part/unit supplied as an ASP ---

Blackletter

Part/unit not supplied as an ASP ---

Icon

Indicates a practice or condition that could result in injury or loss of life if not strictly observed.

Indicates the reference page in blue-letter

Indicates a practice or condition that could result in damage to, or destruction of equipment if not strictly observed.

Indicates the reference page in blue-letter

Indicates the parts that are inevitably broken in the disassembling procedure, and should be replaced with a new one for reassembly.

---

Indicates necessary check items in the disassembling/assembling procedure.

Indicates the reference page in blue-letter

Indicates supplementary explanation for disassembly is given.

Indicates the reference page in blue-letter

Indicates particular tasks to keep quality of the units are required.

Indicates the reference page in blue-letter

Indicates particular routing of cables is required.

Indicates the reference page in blue-letter

Indicates particular adjustment(s) is/are required.

Chapter 4 " Adjustment (p151) "

Indicates lubrication is required.

Chapter 5 " Maintenance (p173) "

Indicates the number of screws securing the parts/units.

---

Indicates the points secured with other than a screw such as a hook, rib, dowel or the like.

---

 FFC/Cable

Black letters indicate a part/unit not supplied as an ASP.

3.3.3 Disassembly Flowchart

This section describes procedures for disassembling the parts/units in a flowchart format. For some parts/units, detailed procedures or precautions are provided (accordingly indicated by icons and cell's color). Refer to the explanations in the example chart below and perform an appropriate disassembling and assembling procedure. (see

Part/Unit” (p142)) For routing cables, see “3.4 Routing FFCs/cables” (p146)

“3.3.4 Repairing Major Components Disassembly/Assembly Procedure” (p113) and “3.4 Detailed Disassembly/Reassembly Procedure for each

The example below shows how to see the charts on the following pages.

Disassembly/Assembly Disassembly/Reassembly Procedures 97

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S12

3.3.3.1 Disassembly/Reassembly Flowchart (ET-4750/ET-4760/L6190/ST-4000 series/ET-3750/ET-3760/L6170/ST-3000 series/ET-3700/ET-3710/L6160 series)

Start

(p 99)

Housing Upper

Front

(p 114)

Cover Ink Eject

(p98)

Maintenance

Box (p98)

Cover Ink Eject

S15

---

Maintenance

Box

---

Pick up Roller

Assy

---

Stacker

---

(p 142)

---

Cover Hinge

SCN

---

Cover Cable

Head

---

Cap Hinge Tank

---

Cap Tank

Paper Guide

Front Assy

(p 124)

Paper Guide

Lower Porous

Pad

(p 113)

---

(p 125)

---

Housing Left

Cover Tank

(p 122)

Pressing Plate Tube

---

Housing Left

(p 115)



Cassette Sensor Cable

(x1)

 Panel Grounding Wire(x1)

 Tank Cover Open Sensor

Cable(x1)

 Panel FFC(x1)

Housing Right

(p 115)

(p 100)

Guide Tube

Supply Ink 2nd

---

Housing Left

(p98)

Star Wheel

Holder Assy

---

 Panel Grounding Wire

(x1)

 Tank Cover Open Sensor

Cable (x1)

Housing Front

Assy

---

Panel Unit (p98)

Housing Right

(p98)

Housing Upper

Rear (p100)

Frame Main

Support

(p 143)

 P/S Unit Cable(x1)

P/S Unit

(p 146)

Fax Box

(p 143) (p 149)

 Fax FFC(x1)

(p 100)

Housing Front

---

 Panel FFC(x1)

ET-4750/ET-4760/L6190/ST-4000 seriesseries specific parts/unit

ET-4750/ET-4760/L6190/ST-4000 series/ET-3750/ET-3760/ L6170/ST-3000 series specific parts/unit

ET-3700/ET-3710/L6160 seriesspecific parts/unit

S12

(p 117)

PF Scale

(p 142)

Holder Core Fax

---

PF Encoder

S10

(p 142)

Screw type/torque list

Symbol Screw Type Torque

S10

S11

S12

S13

S14

S15

ASF Bank Assy

(p 146)

C.B.P-TITE-SCREW-3X10 6±1 kgfcm

C.B.S-TITE-SCREW-3X6 6±1 kgfcm

C.B.P-TITE-SCREW-3X8 6±1 kgfcm

C.B.P-TITE-SCREW-2X8 2.5±0.5 kgfcm

C.B.S-TITE-SCREW-3X8 6±1 kgfcm

C.B.P-TITE SCREW,2.5X8 5±1 kgfcm

C.B.P-TITE SCREW,3X10 7±1 kgfcm

C.B.P-TITE SCREW,3X6 3.5±0.5 kgfcm

C.B.P-TITE.P4.SCREW-3X8 6±1 kgfcm

C.B.P-TITE-SCREW-2X6 2.5±0.5 kgfcm

C.B.P-TITE-SCREW-2X8 2.3±0.2 kgfcm

C.B.P-TITE-SCREW-3X10 (Black) 6±1 kgfcm

C.B.S-TITE-SHOULDER-SCREW-3X10.6 6±1 kgfcm

C.P.SCREW-3X4 4±0.5 kgfcm

SCREW,COVER,FASTEN,M3X8 ---

Panel Unit

(p 148)

Flowchart 3-1. Disassembly/Reassembly Flowchart (ET-4750/ET-4760/L6190/ST-4000 series/ET-3750/ET-3760/L6170/ST-3000 series/ET-3700/ET-3710/L6160 series) (1)

Disassembly/Assembly Disassembly/Reassembly Procedures 98

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(p 98)

Cover Document

Assy

---

ADF Document

Support Cover

---

Document Mat

---

ADF Stacker

Assy

---

PGU LD ADF

Assy

(p 142)

Frame Upper

ADF Assy

---

ADF Document

Support

---

Document Mat

---

 Adapter Tube(x4)

Cover CR

---

Paper Cassette

(p 142)

---

Duplex Unit

---

Pressing Plate

Tube (p108)

---

ADF PAD Assy

---

ADF PAD Spring

---

Adapter (CL)(x3)

---

Adapter (BK)

---

Holder Board

---

Sheet Guide

Tube

(p 144)

Adapter Tube

---

Print Head

(p 126)

ET-4750/ET-4760/L6190/ST-4000 seriesseries specific parts/unit

ET-4750/ET-4760/L6190/ST-4000 series/ET-3750/ET-3760/ L6170/ST-3000 series specific parts/unit

ET-3700/ET-3710/L6160 seriesspecific parts/unit

Screw type/torque list

Symbol Screw Type Torque

S10

S11

S12

S13

S14

S15

---

(p 144)

C.B.P-TITE-SCREW-3X10 6±1 kgfcm

C.B.S-TITE-SCREW-3X6 6±1 kgfcm

C.B.P-TITE-SCREW-3X8 6±1 kgfcm

C.B.P-TITE-SCREW-2X8 2.5±0.5 kgfcm

C.B.S-TITE-SCREW-3X8 6±1 kgfcm

C.B.P-TITE SCREW,2.5X8 5±1 kgfcm

C.B.P-TITE SCREW,3X10 7±1 kgfcm

C.B.P-TITE SCREW,3X6 3.5±0.5 kgfcm

C.B.P-TITE.P4.SCREW-3X8 6±1 kgfcm

C.B.P-TITE-SCREW-2X6 2.5±0.5 kgfcm

C.B.P-TITE-SCREW-2X8 2.3±0.2 kgfcm

C.B.P-TITE-SCREW-3X10 (Black) 6±1 kgfcm

C.B.S-TITE-SHOULDER-SCREW-3X10.6 6±1 kgfcm

C.P.SCREW-3X4 4±0.5 kgfcm

SCREW,COVER,FASTEN,M3X8 ---

Flowchart 3-2. Disassembly/Reassembly Flowchart (ET-4750/ET-4760/L6190/ST-4000 series/ET-3750/ET-3760/L6170/ST-3000 series/ET-3700/ET-3710/L6160 series) (2)

Disassembly/Assembly Disassembly/Reassembly Procedures 99

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EPSON ET-4750/4760/3750/3760/3700/3710/2750/2760/2700/L6190/L6170/L6160/L4160/L4150/ST-4000/ST-3000/ST-2000 series Revision I

(p 98)

Housing Left

(p98)

Housing Upper

Rear

(p 117)

Cover Hinge

SCN (p98)

 SCN FFC (x2)

 SCN Cable (x1)

CR Scale &

Spring

---

 CR Motor Cable (x1)

Cap Tank (p98)

Holder Scale CR

Holder Housing

Ink Eject



Waste Ink Tube (x1)

---

Ink System

(p 143)

I/S transmission

Gear

---

(p 142)

Holder Cable

CSIC Ink Eject

---

Holder

Connector CSIC

IS Assy

---

Ink Eject CSIC

FFC

---

(p 147)

Key Slot Assy

---

Base Right

Support

---

Tank Upper

Porous Pad

---

Tank Cover

Sensor

(p 146)

Ink Tank BK

(p 131)

---

Cap Hinge Tank

(p98)

Cap Tank (p98)

Ink Tank CL (x3)

(p 131)

S1S1

ET-4750/ET-4760/L6190/ST-4000 seriesseries specific parts/unit

ET-4750/ET-4760/L6190/ST-4000 series/ET-3750/ET-3760/ L6170/ST-3000 series specific parts/unit



ADF PE Sensor Cable (x1)

ADF/SCN Unit

(p 122) (p 149)

(p 101)

ET-3700/ET-3710/L6160 seriesspecific parts/unit

Holder Housing

Ink Eject (p100)

Screw type/torque list

SCN Unit

Symbol Screw Type Torque

ADF Unit

(p 142)

Scanner Unit

---

(p 122) (p 149)

SCN Hinge

---

SCN Lock Boss

---

Holder Damper

---

Rack Damper

---

S10

S11

S12

S13

S14

S15

C.B.P-TITE-SCREW-3X10 6±1 kgfcm

C.B.S-TITE-SCREW-3X6 6±1 kgfcm

C.B.P-TITE-SCREW-3X8 6±1 kgfcm

C.B.P-TITE-SCREW-2X8 2.5±0.5 kgfcm

C.B.S-TITE-SCREW-3X8 6±1 kgfcm

C.B.P-TITE SCREW,2.5X8 5±1 kgfcm

C.B.P-TITE SCREW,3X10 7±1 kgfcm

C.B.P-TITE SCREW,3X6 3.5±0.5 kgfcm

C.B.P-TITE.P4.SCREW-3X8 6±1 kgfcm

C.B.P-TITE-SCREW-2X6 2.5±0.5 kgfcm

C.B.P-TITE-SCREW-2X8 2.3±0.2 kgfcm

C.B.P-TITE-SCREW-3X10 (Black) 6±1 kgfcm

C.B.S-TITE-SHOULDER-SCREW-3X10.6 6±1 kgfcm

C.P.SCREW-3X4 4±0.5 kgfcm

SCREW,COVER,FASTEN,M3X8 ---

Flowchart 3-3. Disassembly/Reassembly Flowchart (ET-4750/ET-4760/L6190/ST-4000 series/ET-3750/ET-3760/L6170/ST-3000 series/ET-3700/ET-3710/L6160 series) (3)

Disassembly/Assembly Disassembly/Reassembly Procedures 100

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Epson ET-4750, ET-4760, L6190, ST-4000, ET-3750 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

OPERATING PRINCIPLES

1.1 Printer Mechanism Overview

1.1.1 Print Head

1.1.2 Carriage (CR) Mechanism

1.1.3 Paper Loading/Feed Mechanism

1.1.4 Ink System Mechanism

1.1.5 List of Motor and Sensor

1.2 Scanner/ADF Overview

1.2.1 Scanner Mechanism

1.2.2 ADF Mechanism (ET-4750/ET-4760/L6190/ST-4000 series/ET-3750/ET-3760/L6170/ST-3000 series only)

1.3 Paper Loading/Feed Mechanism

1.3.1 Overview

1.3.2 Operation Principle

1.4 Ink System Mechanism

1.4.1 Overview

1.4.2 Operating Principles

TROUBLESHOOTING

2.1 Troubleshooting

2.1.1 Troubleshooting Workflow

2.2 Power-On Sequence

2.3 Fatal Error Code List

2.3.1 Displaying the Fatal Error Code

2.3.2 Fatal Error Code

2.4 Service Support Mode

2.4.1 Touch Panel 2.4 inch model

2.4.2 LCD Model

2.4.3 Status Sheet Information

DISASSEMBLY/ASSEMBLY

3.1 Overview

3.1.1 Tools

3.1.2 Jigs

3.1.3 Locations of the Parts/Units

3.1.4 Standard Operation Time for Servicing the Product

3.1.5 Checks and Precautions before Disassembling

3.2 Common Cautions on Disassembly/Reassembly

3.3 Disassembly/Reassembly Procedures

3.3.1 Parts/Components Need to be Removed Before Disassembly/Reassembly

3.3.2 Functional differences between models and component parts

3.3.3 Disassembly Flowchart