Epson WF-7820, WF-7830, WF-7840, EC-C7000 Service Manual
Service Manual
Color Inkjet Printer
EPSON
WF-7820 Series
WF-7830 Series
WF-7840 Series/EC-C7000
Confidential
SEMF20-003
Notice
All rights reserved. No part of this manual may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying,
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.
Copyright © 2020 SEIKO EPSON CORPORATION.
P ⋅ CS Quality Assurance Department
Confidential
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.
Confidential
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, would result in injury
or loss of life.
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
personal injury or may cause damage to, or destruction of
equipment.
Indicates a prohibited action.
Notes have important information and useful tips on the
operation of your equipment.
Indicates that a particular task must be carried out according
to a certain standard after disassembly and before
reassembly, otherwise the quality of the components in
question may be adversely
Indicates an operating or maintenance procedure, practice,
or condition that is necessary to keep the product's quality.
Indicates a lubrication point, practice, or condition that is
necessary to keep the product's quality.
Indicates that special tools and jigs are required.
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 "3.3.3 Disassembly Flowchart (p108)".
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Revision Status
Revision Date of Issue Description
A August 21, 2020 First release
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EPSON WF-7820 Series, WF-7830 Series, WF-7840 Series/EC-C7000 Revision A
Contents
Chapter 1 Operating Principles
1.1 Overview .............................................................................................................. 11
1.1.1 Printhead...................................................................................................... 11
1.1.2 Carriage Mechanism / APG Mechanism..................................................... 12
1.1.3 Paper Loading/Feed Mechanism ................................................................. 13
1.1.4 Ink System Mechanism................................................................................ 14
1.1.5 Scanner Mechanism..................................................................................... 15
1.1.6 ADF Mechanism.......................................................................................... 16
1.1.7 List of Motor and Sensor ............................................................................. 18
1.2 APG Mechanism Operating Principles ................................................................ 20
1.2.1 Overview...................................................................................................... 20
1.2.2 Operating Principles .................................................................................... 21
1.2.2.1 Driving Path.........................................................................................21
1.2.2.2 PG Type ...............................................................................................22
1.3 Paper Loading/Feed Mechanism Operating Principles........................................ 23
1.3.1 Overview...................................................................................................... 23
1.3.1.1 Paper Feeding Path ..............................................................................24
1.3.2 Operating Principles .................................................................................... 27
1.3.2.1 Driving Path.........................................................................................27
1.3.2.2 Pre-paper Loading................................................................................ 34
1.3.2.3 Stacker Auto Open/Close Mechanism.................................................35
1.4 Ink System Mechanism ........................................................................................ 37
1.4.1 Overview...................................................................................................... 37
1.4.1.1 Mechanical Configuration ...................................................................37
1.4.1.2 Cleaning............................................................................................... 38
1.4.1.3 Controlling Waste Ink..........................................................................38
1.4.2 Operating Principles .................................................................................... 39
1.4.2.1 Drive Path ............................................................................................39
1.4.3 Operation of Each Mechanism .................................................................... 41
1.4.3.1 Pump Mechanism.................................................................................41
1.4.3.2 Cap Mechanism ................................................................................... 42
1.4.3.3 Carriage Lock Mechanism................................................................... 43
1.4.3.4 Wiper Mechanism................................................................................43
1.4.3.5 Venting Valve...................................................................................... 44
Chapter 2 Troubleshooting
2.1 Troubleshooting.................................................................................................... 46
2.1.1 Troubleshooting Workflow ......................................................................... 46
2.2 Power-On Sequence ............................................................................................. 49
2.3 Fatal Error Code List............................................................................................ 50
2.3.1 Displaying the Fatal Error Code.................................................................. 50
2.3.2 Fatal Error Code .......................................................................................... 50
2.3.2.1 ADF/Scanner ....................................................................................... 51
2.3.2.2 Printer (CR)..........................................................................................58
2.3.2.3 Printer (PF) ..........................................................................................61
2.3.2.4 Printer (ASF)........................................................................................63
2.3.2.5 Printer (2nd ASF: WF-7830 Series/WF-7840 Series/EC-C7000 only)
.......................................................................................................................... 66
2.3.2.6 Printer (I/S) ..........................................................................................68
2.3.2.7 Printer (Stacker)...................................................................................70
2.3.2.8 Printer (RASF: WF-7820 Series/WF-7840 Series/EC-C7000 only) ... 72
2.3.2.9 Printer (Head/CSIC) ............................................................................ 74
2.3.2.10 Printer (Others) .................................................................................. 76
2.3.2.11 System Error ......................................................................................78
2.4 Service Support Mode.......................................................................................... 79
2.4.1 Overview ..................................................................................................... 79
2.4.2 Structure of service support mode menu ..................................................... 79
2.4.3 Service Support Mode startup and operating procedures............................ 79
2.4.4 Status Sheet Information ............................................................................. 82
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8
EPSON WF-7820 Series, WF-7830 Series, WF-7840 Series/EC-C7000 Revision A
Chapter 3 Disassembly/Assembly
3.1 Overview .............................................................................................................. 97
3.1.1 Tools ............................................................................................................ 97
3.1.2 Jigs............................................................................................................... 97
3.1.3 Locations of the Parts/Units......................................................................... 98
3.1.4 Standard Operation Time for Servicing the Product ................................... 99
3.2 Common Cautions on Disassembly/Reassembly ............................................... 105
3.3 Disassembly/Reassembly Procedures ................................................................ 107
3.3.1 Parts/Components Need to be Removed Before Disassembly/Reassembly
............................................................................................................................. 107
3.3.2 Functional differences between models and component parts .................. 107
3.3.3 Disassembly Flowchart.............................................................................. 108
3.3.3.1 WF-7820 Series/WF-7840 Series/EC-C7000.................................... 109
3.3.3.2 WF-7830 Series ................................................................................. 115
3.3.4 Repairing Major Components Disassembly/Assembly Procedure............ 121
3.3.4.1 Maintenance Box ...............................................................................121
3.3.4.2 Housing Left ......................................................................................121
3.3.4.3 Housing Right....................................................................................124
3.3.4.4 Rear ASF Cover Assy (WF-7820 Series/WF-7840 Series/EC-C7000
only) ................................................................................................................126
3.3.4.5 ADF/Scanner Unit .............................................................................128
3.3.4.6 Printhead ............................................................................................129
3.3.4.7 Housing Upper...................................................................................133
3.3.4.8 Inksystem Unit...................................................................................134
3.3.4.9 2nd Bin Assy (WF-7830 Series/WF-7840 Series/EC-C7000 only) ..137
3.3.4.10 Main Board ...................................................................................... 138
3.3.4.11 Rear ASF Unit (WF-7820 Series/WF-7840 Series/EC-C7000 only)
......................................................................................................................... 140
3.3.4.12 CR Unit w/CR Guide Shaft.............................................................. 143
3.3.4.13 Paper Guide Upper Left/Paper Guide Upper Center/Paper Guide Upper
Right................................................................................................................146
3.3.4.14 Porous Pad A/Porous Pad B.............................................................148
3.4 Detailed Disassembly/Reassembly Procedure for each Part/Unit...................... 152
3.5 Routing FFCs/cables .......................................................................................... 156
Chapter 4 Adjustment
4.1 Required Adjustments....................................................................................... 161
4.2 Adjustment Program........................................................................................... 166
4.2.1 Operating Environment ............................................................................. 166
4.2.2 Adjustment and Inspection List................................................................. 166
4.2.3 Details of the Adjustment Program ........................................................... 171
4.2.3.1 Adjustment (Print Adjustment by Program)...................................... 171
4.3 Mechanism Adjustment / Check ........................................................................ 178
4.3.1 PG Adjustment .......................................................................................... 178
4.3.1.1 PG Adjustment procedure..................................................................178
4.3.1.2 Preparation.........................................................................................178
4.3.1.3 PG adjustment procedure...................................................................181
4.3.1.4 Checking the Platen Gap.................................................................... 183
Chapter 5 Maintenance
5.1 Cleaning.............................................................................................................. 185
5.1.1 Cleaning the CR Unit ................................................................................ 185
5.1.2 Cleaning the Exterior Parts/inside of the printer ....................................... 186
5.2 Lubrication ......................................................................................................... 186
5.2.1 Lubrication Points and Instructions........................................................... 187
Chapter 6 Appendix
6.1 Connection Diagram........................................................................................... 193
6.2 Head Fuse........................................................................................................... 194
6.3 Protection for Transportation ............................................................................. 195
6.3.1 Securing the CR Unit................................................................................. 195
6.3.2 Protection of Stacker Assy ........................................................................ 196
6.3.3 Protection of Cassette Cover ..................................................................... 196
6.3.4 Protection of Scanner Unit ........................................................................ 197
6.3.5 Protection of Paper Support
(WF-7820 Series/WF-7840 Series/EC-C7000 only) ........................................... 198
6.3.6 Securing the ADF Document Support....................................................... 198
6.3.7 Securing the Paper Support Cover
(WF-7820 Series/WF-7840 Series/EC-C7000 only) ........................................... 199
6.3.8 Securing the Maintenance Box.................................................................. 199
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9
OPERATING PRINCIPLES
CHAPTER
1
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EPSON WF-7820 Series, WF-7830 Series, WF-7840 Series/EC-C7000 Revision A
A#3
A#2
A#1
A#400
A#399
A#398
B#400
B#399
B#398
B#3
B#2
B#1
C#3
C#2
C#1
C#400
C#399
C#398
D#400
D#399
D#398
D#3
D#2
D#1
C#136
C#129
C#128
D#136
C#137
D#137
D#129
D#128
C#272
C#265
C#264
D#272
C#273
D#273
D#265
D#264
0.085 ｍｍ
1/300 inch）
8.636 ｍｍ
(204/600 inch
）
1.016 ｍｍ
(24/600 inch）
）
0.042 ｍｍ
1/600 inch）
）
Black
Column A
Column B
Column C
Column D
Carriage movement direction
Paper feed direction
Column Color
ABk
BBk
C #1~#128 Y
C #137~#264 M
C #273~#400 C
D #1~#128 Y
D #137~#264 M
D #273~#400 C
Yellow
Cyan
Magenta
Not used
1.1 Overview
This chapter describes overview of each mechanism inside the printer.
1.1.1 Printhead
Table 1-1. μTFP2 Head Nozzle Configuration
Color Bk, C, M, Y (four colors)
Number of nozzles 1568 nozzles
(Bk: 400 nozzles x 2 columns / Y, M, C: 256 nozzles per color)
Nozzle pitch 300 dpi
Figure 1-1. μTFP2 Head Appearance
Figure 1-2. μTFP2 Head Nozzle Layout
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Operating Principles Overview 11
EPSON WF-7820 Series, WF-7830 Series, WF-7840 Series/EC-C7000 Revision A
CR Scale
Main Frame
CR Guide Shaft
CR Unit
CR Timing Belt
Eccentric Cam
Eccentric
Cam
CR Motor
(Backside of the Main Frame)
CR Unit
Section view
Main Frame
CR Guide Shaft
CR Encoder
CR Scale
CR Unit
Rear
1.1.2 Carriage Mechanism / APG Mechanism
The carriage mechanism is consist of CR Unit, CR Encoder, CR Scale, CR
Motor, CR Timing Belt, and etc. The carriage mechanism is a key mechanism
to ensure stable print quality because printing is performed by moving the CR
Unit from side to side.
The CR Unit is supported by the CR Guide Shaft and by the Main Frame.
When the CR Motor rotates, and drive force is transmitted to the CR Timing
Belt, the CR Unit fastened to the CR Timing Belt moves to the left and right to
implement printing.
The position and speed of the CR Unit are always monitored by the CR
Encoder and CR Scale, and the CR Motor is controlled in accordance with the
information acquired by the CR Encoder.
*1
The APG mechanism
the paper (PG: Platen Gap) as suitable, depending on the paper to be printed.
When the PF Motor drive force rotates the CR Guide Shaft via the APG Mechanism, the CR Guide Shaft is raised and lowered by the Eccentric Cams
mounted to both ends of the CR Guide Shaft. With this, the CR Unit supported
by the CR Guide Shaft rises and lowers, and the Platen Gap is set properly.
adjusts the distance between the printhead nozzle and
Operating Principles Overview 12
*1. See "1.2 APG Mechanism Operating Principles" (p 20) for the details of the APG mechanism.
Figure 1-3. Carriage Mechanism
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EPSON WF-7820 Series, WF-7830 Series, WF-7840 Series/EC-C7000 Revision A
Paper feed mechanism
(includes Duplex Unit)
Front paper loading
mechanism
Rear paper loading mechanism
Cassette
Stacker auto open/close
mechanism
1.1.3 Paper Loading/Feed Mechanism
This product employs the front paper loading*1 and the rear paper loading*2
mechanism. This also supports automatic duplex printing. The lower path that
is independent to the paper conveyance path for printing has been added as the
paper turn-over path for duplex printing.
Each mechanisms are driven by the ASF Motor, RASF Motor*2, and PF Motor.
Also, the throughput for continuous printing and duplex printing is
dramatically improved compared to conventional models by mounting “Prepaper Loading” that loads the next page while printing.
The Auto Open/Close Mechanism for the Stacker has been installed. This
functions automatically to pull out the Stacker to correspond to the size of the
paper being printed. The Auto Open/Close Mechanism for the Stacker operates
using the drive force of the STK Motor.
*3
Figure 1-4. Paper Loading/Feed Mechanism
*1. WF-7820 Series: one cassette
WF-7830 Series/WF-7840 Series/EC-C7000: two cassettes
*2. Except for WF-7830 Series
*3. See "1.3 Paper Loading/Feed Mechanism Operating Principles" (p 23) for more details.
Operating Principles Overview 13
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EPSON WF-7820 Series, WF-7830 Series, WF-7840 Series/EC-C7000 Revision A
Ink System Mechanism
Maintenance Box
Ink system mechanism
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 direct acting type for capping. The
Pump Motor drives the pump mechanism, capping mechanism, wiper mechanism, carriage lock mechanism, and venting valve mechanism to clean the
Printhead.
User replaceable Maintenance Box is installed to this product. A CSIC
mounted on the Maintenance Box keeps track of how much waste ink has been
collected.
Figure 1-5. Ink System Mechanism
*1. See "1.4 Ink System Mechanism" (p 37) for more details.
Operating Principles Overview 14
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EPSON WF-7820 Series, WF-7830 Series, WF-7840 Series/EC-C7000 Revision A
Scanner Unit
CIS Module
Scanner Motor
Scanner Document Size Sensor*
Note " * " : Except for WF-7830 Series
1.1.5 Scanner Mechanism
The scanner mechanism consists of a Scanner Motor that drives the Scanner
Carriage equipped with the CIS Module that scans documents and the Scanner
*1
Document Size Sensor
of this printer, the CIS module moves using a timing belt, scanning documents.
that detects the document size. For the Scanner Unit
Figure 1-6. Scanner Mechanism
*1. Except for WF-7830 Series
Operating Principles Overview 15
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EPSON WF-7820 Series, WF-7830 Series, WF-7840 Series/EC-C7000 Revision A
EJ Roller
Pickup Roller
ADF Unit
ADF Motor
Solenoid
PF Roller
ADF PE Sensor
ADF DOC Sensor
ADF PW Sensor
ADF PL Sensor*
EJ Driven Roller
Separation Roller
ADF PW Sensor*
Note " *" : Except for WF-7830 Series
Pickup Roller Separation Roller
EJ Roller
CIS
Lever of ADF
PE Sensor
ADF DOC Lever
PF Roller
Front side scanning
Rear side scanning
1.1.6 ADF Mechanism
The ADF mechanism uses a stationary image sensor that scans documents
transported by the mechanism. It consists of ADF Motor, ADF Encoder, ADF
PE Sensor, ADF DOC Sensor, ADF PW Sensor, ADF PL Sensor, PF Roller, EJ
Roller, Pickup Roller and etc.
The mechanism is also capable of turning over the documents when finished
scanning their one side, and then scanning the other side (automatic doublesided scanning).
DOCUMENT FEED PATH
When scanning document, the document is fed inside the ADF as shown
below.
Figure 1-8. Document Feed Path
Operating Principles Overview 16
Figure 1-7. ADF Mechanism
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EPSON WF-7820 Series, WF-7830 Series, WF-7840 Series/EC-C7000 Revision A
ADF Motor
PF Roller
ADF Scale
ADF Encoder
Pickup Roller
LD planet gear
ADF Solenoid 1ADF Solenoid 2
EJ Roller
EJ intermittent
gear
EJ planet gear
Combination
gear 4
Spur gear E
Spur gear D
Spur gear B
Combination
gear 3
Combination
gear 2
Spur gear A
Combination
gear 1
Rear
Spur gear C
ADF Motor
Combination gear 1 Combination gear 2
Spur gear A
PF Roller
ADF Scale
Spur gear B
LD planet gear
Spur gear C
Pickup Roller
Spur gear D
Combination gear 3
EJ Roller
Combination gear 4
EJ planet gear
Spur gear E
EJ intermittent gear
LD Lever
EJ Lever
LD Lever
EJ Lever
ADF Solenoid 2
ADF Solenoid 1
DRIVING PATH
The ADF Motor, which uses the DC motor, is controlled by the ADF Scale and
the ADF Encoder. The following describes the relationship between the
rotation direction of the ADF Motor and the movement of the ADF.
Rotation direction* Movement
CCW (counter clockwise) Scanning Operation (Paper Loading to Ejection)
CW (clockwise) Turn-over operation for rear side scanning
Note " *": Rotation direction seen from the output shaft side of the motor.
Drive force of the ADF Motor drives the Pickup Roller, PF Roller, EJ Roller,
and EJ intermittent gear in the path shown in Figure 1-9.
The ADF Solenoid 1/2 are used for rotation control of the Pickup Roller, and to
control the rising and lowering of the EJ Driven Roller that passes through the
EJ Intermittent Gear.
When idling
The ADF Solenoid 1/2 are not being energized. At this time, the LD Lever
and the EJ Lever transmit paper-loading direction rotation from the LD
Planet Gear to the Pickup Roller through the Spur Gear C, and maintains
When paper loading originals
them in a state that prevents rising of the EJ Driven Roller that passes from
the EJ Planet Gear through the EJ Intermittent Gear.
By energizing the ADF Solenoid after the ADF Motor starts rotating in the
CCW direction, the LD Lever releases the LD Planet Gear enabling drive
force transmission to the Pickup Roller. The Pickup Roller rotates in the
paper-loading direction and the Separation Roller is lowered.
Operating Principles Overview 17
Figure 1-9. Driving Path
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EPSON WF-7820 Series, WF-7830 Series, WF-7840 Series/EC-C7000 Revision A
D
B
E
7
8
2
5
12
9
4
A
C
6
3
11
10
1
13
14
15
17
16
1.1.7 List of Motor and Sensor
This section describes the types and positions of the motors and sensors.
Table 1-2. List of Motor and Sensor (1)
Mechanism name
Carriage
mechanism
Paper loading/
feed mechanism
Motor/Sensor name Motor/Sensor type No.
CR Motor DC Motor D
CR Encoder Transmission-type photo interrupter 17
PW Sensor Reflection-type photo interrupter 15
APG Sensor Transmission-type photo interrupter 7
PF Motor DC Motor B
PF Encoder Transmission-type photo interrupter 8
ASF Motor DC Motor E
ASF Encoder Transmission-type photo interrupter 14
RASF Motor
RASF Encoder
STK Motor DC Motor C
STK Encoder Transmission-type photo interrupter 16
1st Cassette Sensor Mechanical contact 13
2nd Cassette Sensor
PE Sensor Transmission-type photo interrupter 9
PE2 Sensor Transmission-type photo interrupter 12
PE3 Sensor Transmission-type photo interrupter 4
LD Phase Sensor Transmission-type photo interrupter 6
RASF Paper Sensor
Stacker A4 Position
Sensor
Stacker A3 Position
Sensor
Duplex Unit Sensor Mechanical contact 1
*1
*1
*2
*1
Note "*1": WF-7820 Series/WF-7840 Series/EC-C7000 only
"*2": WF-7830 Series/WF-7840 Series/EC-C7000 only
Operating Principles Overview 18
DC Motor A
Transmission-type photo interrupter 2
Mechanical contact 5
Transmission-type photo interrupter 3
Mechanical contact 11
Mechanical contact 10
Figure 1-10. List of Motor and Sensor (1)
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EPSON WF-7820 Series, WF-7830 Series, WF-7840 Series/EC-C7000 Revision A
H
F
G
28
30
25
29
26
20
19
18
21
21
27
24
22
23
34
Table 1-3. List of Motor and Sensor (2)
Mechanism name
Ink system
mechanism
Others PIS Sensor Reflection-type photo interrupter
Scanner Scanner Motor DC Motor F
ADF Unit ADF Motor DC Motor G
Motor/Sensor name Motor/Sensor type No.
Pump Motor DC Motor H
Pump Encoder Transmission-type photo interrupter 29
Scanner Open Sensor Mechanical contact 28
Scanner Encoder Transmission-type photo interrupter 30
CIS Module CIS 26
Scanner Document
Size Sensor
*1
Reflection-type photo interrupter 20
ADF Encoder Transmission-type photo interrupter 25
ADF Close Sensor
ADF Half Close
*1
Sensor
ADF PW Sensor (x2)
ADF PL Sensor
ADF Solenoid 1 Solenoid 24
ADF Solenoid2 Solenoid 22
ADF DOC Sensor Transmission-type photo interrupter 23
ADF PE Sensor Transmission-type photo interrupter 34
*1
*1
Mechanical contact 19
Mechanical contact 18
*2
Transmission-type photo interrupter 21
Transmission-type photo interrupter 27
Note "*1": WF-7820 Series/WF-7840 Series/EC-C7000 only
"*2": Only rear side one is equipped on WF-7830 Series.
Figure 1-11. List of Motor and Sensor (2)
Operating Principles Overview 19
Confidential
EPSON WF-7820 Series, WF-7830 Series, WF-7840 Series/EC-C7000 Revision A
CR Unit
CR Guide Shaft
APG Cam Left
APG Cam Right
PG Adjust Cam Left
PG Adjust Cam Right
APG Change Gear
APG Sensor
1.2 APG Mechanism Operating Principles
The APG Mechanism rotates the Cams at both ends of the CR Guide Shaft that
supports the CR Unit with the drive force of the PF Motor, and switches the PG
(4 types).
1.2.1 Overview
The APG Mechanism is composed of the APG Change Gear that switches
drive force transmission from the PF Motor, the APG Sensor that detects the
PG Position, and the APG Cams (left/right) on both ends of the CR Guide
Shaft.
The APG Sensor that detects each PG Position adopts the transmission-type
photo interrupter. When the drive force of the PF Motor is transmitted to the
APG Cams by the APG Change Gear, the APG Cams rotate along with the
rotation of the PF Motor. The PG Position detection flag is mounted to the
APG Cam Left. When the flag passes through the slit in the APG Sensor, it
detects the PG Position.
The APG Cams on both ends of the CR Guide Shaft are installed on top of each
of the PG Adjust Cams (left/right). When the APG Cams are rotated by the
drive force from the PF Motor, the CR Guide Shaft moves up and down using
the PG Adjust Cams as pivot points. This action switches the PG.
*1
*1. See "1.2.2 Operating Principles" (p 21).
Operating Principles APG Mechanism Operating Principles 20
Figure 1-12. APG Mechanism
Confidential
EPSON WF-7820 Series, WF-7830 Series, WF-7840 Series/EC-C7000 Revision A
PF Motor
PF Roller
PF Timing Belt
EJ Roller
Center
APG Cam Left/
CR Guide Shaft
APG Change Gear
Full side
Combination gear A
Spur gear1
Combination
gear B
Spur gear 2
Combination gear D
Combination gear C
APG Change Gear
APG Cannot Switch
APG Can Switch
The gear train that transmits drive force from
the APG Change Gear and the PF Motor, and
the gear that rotates the APG Cams on the
ends of the CR Guide Shaft are not engaged
with the tension of the spring.
Drive force from the PF Motor is
transmitted to the APG Cams on the ends of
the CR Guide Shaft by the CR Unit pushing
the APG Change Gear.
CR Unit
APG Sensor
Top
1.2.2 Operating Principles
1.2.2.1 Driving Path
The APG Change Gear in the APG Unit transmits drive force of the PF Motor
to the APG Cams by the engaging of the gear train that transmits drive force
from the PF Motor and the gear that rotates the APG Cams on the ends of the
CR Guide Shaft.
This APG Change Gear is normally in an disengaged state with each gear train
by the compression spring. This prevents the PG from being changed when
conveying paper because the PF Motor drives the PF Roller and EJ Roller.
To change the PG, push the APG Change Gear by moving the CR Unit to the
Full side. By doing this, drive force of the PF Motor switches to a state to be
transmitted to the APG Cams by each gear train and the APG Change Gear
engaging.
The PG change is detected by the APG Sensor. The output of the APG Sensor
is High when the flag on the APG Cam Left is in the slit in the APG Sensor.
Figure 1-13. Driving Path
Operating Principles APG Mechanism Operating Principles 21
Confidential
EPSON WF-7820 Series, WF-7830 Series, WF-7840 Series/EC-C7000 Revision A
(When the PF Motor rotates further in the CW direction from the state of PG4, it transitions again to PG1.)
CW
High High High HighLow Low Low Low Low
1.5
1.85
2.35
3.0
1.2.2.2 PG Type
This product has four types of PGs. The following describes the details of PGs. If the PG position is unknown for some reason, set it to PG1 using the APG reset
operation.
PF Motor
rotation
direction*
APG Sensor
Output
PG (mm)
PG position
Printing
Application
Not
printing
Note " *": Rotation direction seen from the output shaft side.
Operating Principles APG Mechanism Operating Principles 22
--- PG1 --- PG2 --- PG3 --- PG4 ---
---
• Printing plain
paper (Single)
default
• Special paper
(Glossy paper)
---
• Initialization
when turning
power ON
• When turning
power OFF
• Plain paper: Fine
• Duplex printing
• Avoid rubbing
in high speed
(Bi-d)
• Special paper
(matte paper)
---
• Avoid rubbing
(Uni-d)
---
--- ---
• Envelope (Unid)
• Avoid rubb ing at
PG3
---
• Cleaning
(wiping)
Confidential
EPSON WF-7820 Series, WF-7830 Series, WF-7840 Series/EC-C7000 Revision A
LD Roller*
LD Roller*
PF Roller
EJ Roller Center
Holder Cam Assy
Change Slider
PF Encoder
Paper Support*
Paper Cassette
Stacker
STK Motor
PF Motor
Intermediate
Roller
Pickup Roller
Assy
RASF Motor*
EJ Roller Front
PE1 Sensor
PE3 Sensor
PE2 Sensor
ASF Motor
Intermediate
Roller
Note " * " : Except for WF-7830 Series
1.3 Paper Loading/Feed Mechanism Operating Principles
1.3.1 Overview
The following describes the relationship between each mechanism relating to
paper loading and paper feeding, and the drive motors/sensors. The DC Motor
is used in each mechanism so the rotary encoder is used for control.
Function Power source Configuration
With front paper loading enabled by the Change Lever, the ASF
Front paper
loading
Rear paper
loading
Paper feeding/
Auto duplex
printing
(paper
reversing)
Stacker open/
close
*2
ASF Motor
RASF Motor
ASF Motor
PF Motor
ASF Motor
STK Motor
Note "*1" : Except for WF-7820 Series
"*2": Except for WF-7830 Series
Motor drives the Pickup Roller Assy (Paper Cassette 1st/Paper
Cassette 2nd
the cassette to the PF Roller. Select Paper Cassette 1st or Paper
Cassette 2nd with the rotation direction of the ASF Motor and the
Change Slider position.
The paper conveyance state is detected by the PE3 Sensor near the
Intermediate Roller and the PE1 Sensor in front of the PF Roller.
The LD Roller is rotated by driving the RASF Motor to convey
paper from the Rear ASF to the Intermediate Roller.
The state of the LD Roller is detected by the LD Phase Sensor.
Drive the Intermediate Roller to convey paper from the
Intermediate Roller to the PF Roller. The paper conveyance state
is detected by the PE3 Sensor near the Intermediate Roller and
the PE1 Sensor in front of the PF Roller.
Drive the PF Roller and the EJ Roller Center to convey the paper
being printed.
Drive the Intermediate Roller to convey paper from the
Intermediate Roller to the PF Roller. The paper conveyance state
is detected by the PE3 Sensor near the Intermediate Roller and
the PE1 Sensor in front of the PF Roller.
If the Stacker is housed in the body, the Stacker is automatically pulled
out when starting printing to correspond to A4 size or to A3 size paper
for the paper to be printed.
Also, when the power supply is turned off, or the like, house the Stacker.
The state of the Stacker is detected by the Stacker A4 Position Sensor
and the Stacker A3 Position Sensor.
*1
) and the Intermediate Roller to convey paper from
Operating Principles Paper Loading/Feed Mechanism Operating Principles 23
Figure 1-14. Paper Loading/Feed Mechanism
Confidential
EPSON WF-7820 Series, WF-7830 Series, WF-7840 Series/EC-C7000 Revision A
Paper Cassette 1st
EJ Roller Front
PF Roller
PE1 Sensor
Pickup Roller Assy
Star Wheel Holder
Paper Cassette 2nd
EJ Roller Center
PE1 Sensor
Section view
PE3 Sensor
PE3 Sensor
Star Wheel Holder Center
Star Wheel Holder
Center
Star Wheel
Holder
Paper
Cassette 1st
Intermediate Roller
Intermediate Roller
EJ Roller Center
PF Roller
PE1 Sensor
Pickup Roller Assy
PE1 Sensor
Section view
PE3 Sensor
PE3 Sensor
EJ Roller Front
Star Wheel Holder
Star Wheel Holder Center
Star Wheel
Holder Center
Star Wheel
Holder
Paper Cassette 2nd
Paper Cassette 2nd
Intermediate Roller
Intermediate Roller
1.3.1.1 Paper Feeding Path
1.3.1.1.1 Front Paper Loading
Paper loaded into the Paper Cassette is fed to the Intermediate Roller by way of
the Pickup Roller Assy, and arrives at the PE1 sensor via PE3 Sensor. Next,
skew is removed, and the paper is printed while being fed using the PF Roller
and EJ Roller Center/EJ Roller Front/Star Wheel Holder.
Figure 1-16. Paper Loading Path When Using Front Paper Loading (2)
Figure 1-15. Paper Loading Path When Using Front Paper Loading (1)
Operating Principles Paper Loading/Feed Mechanism Operating Principles 24
Confidential
EPSON WF-7820 Series, WF-7830 Series, WF-7840 Series/EC-C7000 Revision A
Hopper
EJ Roller Front
PF Roller
PE1 Sensor
LD Roller
EJ Roller Center
Hopper
LD Roller
PE1 Sensor
Section view
PE3 Sensor
PE3 Sensor
Star Wheel Holder
Star Wheel Holder Center
Star Wheel
Holder Center
Star Wheel
Holder
Intermediate Roller
Intermediate Roller
1.3.1.1.2 Rear Paper Loading (Except for WF-7830 Series)
Paper set in the Hopper in the rear of the printer is fed to the PE3 Sensor
position by the LD Roller.
Thereafter, it is conveyed by the Intermediate Roller to the PE1 Sensor
position. After deskewing, printing is implemented while the paper is conveyed
by the PF Roller and EJ Roller Center/EJ Roller Front/Star Wheel Assy.
Operating Principles Paper Loading/Feed Mechanism Operating Principles 25
Figure 1-17. Paper Loading Path When Using Rear Paper Loading
Confidential
EPSON WF-7820 Series, WF-7830 Series, WF-7840 Series/EC-C7000 Revision A
EJ Roller Center
PF Roller
PE1 Sensor
Section view
EJ Roller Front
Upper path
Lower path
Change Flap (descent)
Change Flap (rise)
Lower Path Roller
EJ Roller Front
PE1 Sensor
PE3 Sensor
PE3 Sensor
PE1 Sensor
Intermediate Roller
Intermediate Roller
1.3.1.1.3 Paper Loading Path When Using Duplex Printing
This product has two paper turn-over paths to improve throughput when
implementing duplex printing.
After printing the front of the page, the printer holds the paper using the EJ
Roller Center/EJ Roller Front and Star Wheel Holder Assy in order to dry the
ink on the page.
After the prescribed drying time has passed, and after conveying the paper up
to a state in which it is gripped only by the EJ Roller Front and the Star Wheel
Holder Assy, the path is switched using the Change Flap.
Upper Path
After lowering the Change Flap and switching the turn-over path to the upper
path, rotate the EJ Roller Front in reverse to convey the paper with the EJ
Roller Center and PF Roller. After the paper reaches the Intermediate Roller
and the PE3 Sensor detects the leading edge of the back side of the paper, the
paper is conveyed up to the PE1 Sensor after deskewing and the back side of
the paper is printed.
Lower Path
After raising the Change Flap and switching the turn-over path to the lower
path, the printer conveys the paper using the Lower Path Roller. After the paper
reaches the Intermediate Roller via the PE2 Sensor, and the leading edge of the
back side of the paper is detected by the PE3 Sensor, the paper is conveyed up
to the PE1 Sensor after deskewing and the back side of the paper is printed.
Operating Principles Paper Loading/Feed Mechanism Operating Principles 26
Figure 1-18. Paper Turn-over Path When Implementing Duplex Printing
Confidential
EPSON WF-7820 Series, WF-7830 Series, WF-7840 Series/EC-C7000 Revision A
EJ Roller Center
RASF Motor
*1
PF Roller
PF Motor
Paper Back Lever
*1
Hopper
*1
LD Roller
*1
ASF Motor A
Pickup Roller 1st
EJ Roller Front
Lower Path Roller
Intermediate Roller
Note "*1" : Except for WF-7830 Series
"*2": Except for WF-7820 Series
Pickup Roller 2nd
*2
1.3.2 Operating Principles
1.3.2.1 Driving Path
In this section, driving path from each motor*1 driving paper loading/feed
mechanism to rollers which load/feed paper.
Drive targets Driving motor Ref.
Pickup Roller ASF Motor p.28
Intermediate Roller ASF Motor p.29
LD Roller*/Paper Back Lever*/Hopper* RASF Motor* p.30
PF Roller/EJ Roller Center PF Motor p.31
EJ Roller Front/Lower Path Roller PF Motor p.31
Note "* " : Except for WF-7830 Series
*1. Each motor is controlled by rotary encoder.
Operating Principles Paper Loading/Feed Mechanism Operating Principles 27
Figure 1-19. Driving Path
Confidential
EPSON WF-7820 Series, WF-7830 Series, WF-7840 Series/EC-C7000 Revision A
Pinion gear of ASF Motor
Combination gear 10.8-20.36
Combination gear 34.2-20.8-20.8
Oneway clutch
Sun gear
Planet gear (x3)
External gear
Spur Gear 24.1 (Change Slider)
Pickup Drive Shaft Pickup Drive Shaft
Pickup Roller Assy
(Paper Cassette 1st)
Oneway clutch
Sun gear
Planet gear (x3)
External gear
Spur Gear 24.1
Spur Gear 32.8.2
Pickup Roller Assy
(Paper Cassette 2nd)
Drive force transmitted only when
the Change Slider is at the 2nd ASF
Trigger ON position
Except for WF-7820 Series
Spur gear 24.1
(Change Slider)
Pickup Roller Assy
(Paper Cassette 2nd)*
Pickup Roller Assy
(Paper Cassette 1st)
Oneway
clutch
Spur gear
32.8.2
Spur gear
24.1
ASF
Motor
Oneway
clutch
Combination gear
34.2-20.8-20.8
Combination
gear 10.8-20.36
Pickup Drive Shaft
Spur
gear 24.1
Spur gear 24.1
(Change Slider)
Front
The Change Slider is at the 2nd
ASF Trigger Off position so
drive force is not transmitted to
the Pickup Roller Assy of Paper
Cassette 2nd.
The Change Slider is at the
2nd ASF Trigger On position
so drive force is transmitted to
the Pickup Roller Assy of
Paper Cassette 2nd.
Note " *" : Except for WF-7820 Series
DRIVE PATH FROM ASF MOTOR TO PICKUP ROLLER
Drive force of the ASF Motor is transmitted to the Pickup Roller Assy of Paper
*1
Cassette 1st or Paper Cassette 2nd
through the path shown below.
Whether drive force is transmitted to the Pickup Roller Assy of either Paper
Cassette 1st and Paper Cassette 2nd, is controlled by the Change Slider position
and the rotation direction of the ASF Motor.
ASF Motor rotation direction Change Slider position Driving Pickup Roller Assy
CCW --- Paper Cassette 1st
CW 2nd ASF trigger ON position Paper Cassette 2nd
The Change Slider switches position depending on the action of the CR Unit.
*2
Also, the oneway clutch
controls so that the Pickup Roller rotates only in the
paper-loading direction.
Figure 1-20. Drive Path From ASF Motor to Pickup Roller (1)
*1. Except for WF-7820 Series
Operating Principles Paper Loading/Feed Mechanism Operating Principles 28
Figure 1-21. Drive Path From ASF Motor to Pickup Roller (2)
*2. See " Principle of Oneway Clutch" (p 33).
Confidential
EPSON WF-7820 Series, WF-7830 Series, WF-7840 Series/EC-C7000 Revision A
Pinion gear of ASF Motor
Combination gear 10.8-20.36
Combination gear 29.29-10.5
Dual oneway clutch
External gear A (Full side)
Intermediate Roller
Sun gear/Output shaft
Planet gear (x5)
Planet gear (x5)
External gear B (Home side)
Spur gear 26.4
Dual drive gear
Planet gear A
Planet gear A
Planet gear A
Spur gear 26.4
Intermediate Roller
Dual oneway clutch
Combination
gear 10.8-20.36
ASF Motor
Combination
gear 29.29-
10.5
Planet gear A
Dual drive gear
Planet gear A
Planet gear A
DRIVE PATH FROM ASF MOTOR TO INTERMEDIATE ROLLER
Drive path from ASF Motor to Intermediate Roller is as shown below.
The Intermediate Roller rotates in a constant direction (paper feed direction)
with the dual oneway clutch regardless of the rotation direction of the ASF
Motor.(p 33)
Rotation
direction of ASF
Motor*
CCW CCW CW Idle
CW CW CCW
Rotation
direction of
external gear
A*
Rotation
direction of
external gear
B*
State of planet
gear B
Engaging
with the
External gear
A claw
Note " * ": Rotation direction seen form spur gear 26.4 side.
State of planet
gear C
Engaging
with the
External gear
B claw
Idle CW
Rotation direction
of sun gear/output
shaft, spur gear
26.4*
CW
Figure 1-22. Drive Path From ASF Motor to Intermediate Roller (1)
Operating Principles Paper Loading/Feed Mechanism Operating Principles 29
Figure 1-23. Drive Path From ASF Motor to Intermediate Roller (2)
Confidential
EPSON WF-7820 Series, WF-7830 Series, WF-7840 Series/EC-C7000 Revision A
Worm gear of RASF
Motor
Combination gear A
Spur gear 17.5
Spur gear 27.2
LD Roller
Clutch
Paper Back Lever
Hopper
Hopper Cam
Combination gear B
Spur gear 1
Spur gear LD
Spur gear 1
Spur gear 2
PB Cam
Engage
clutch
LD Roller
Hopper
LD Phase Sensor
PB Cam
RASF Motor
Spur gear
Retard roller
Combination
gear A
Spur gear
17.5
Combination
gear B
Spur gear
27.2
Spur gear 1
Spur gear LD
Hopper Cam
Spur gear 1
DRIVE PATH FROM RASF MOTOR TO LD ROLLER
*1
RASF Motor drives LD Roller, Hopper, and Paper Back Lever when loading paper
from rear. When the RASF Motor is rotated in the CW direction when looking from
the Output Shaft side, the engaging clutch is connected, so drive force from the
RASF Motor is transmitted up to the LD Roller. When the RASF Motor is rotated
in the CW direction, the engaging clutch is disconnected, so LD Roller does not
rotate. The state of the LD Roller is detected by the LD Phase Sensor.
Figure 1-24. Drive Path From RASF Motor to LD Roller (1)
*1. Except for WF-7830 Series
Operating Principles Paper Loading/Feed Mechanism Operating Principles 30
Figure 1-25. Drive Path From RASF Motor to LD Roller (2)
Confidential
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