SERVICE MANUALColor Inkjet PrinterEpson WF-3720 SeriesCONFIDENTIALNotice:☐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.Note: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 2017SEIKO EPSON CORPORATIONP・CS Quality Assurance DepartmentSafety PrecautionsAll safety procedures described here shall be strictly adhered to by all parties servicing and maintaining this product.DANGERStrictly 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 orperforming 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.WARNINGStrictly observe the following cautions. Failure to comply may lead to personal injury or loss of life.1.Always wear protective goggles for disassembly and reassembly to protect your eyes from ink in working. Ifany ink gets in your eyes, wash your eyes with clean water and consult a doctor immediately.2.When using compressed air products; such as air duster, for cleaning during repair and maintenance, the useof such products containing flammable gas is prohibited.PRECAUTIONSStrictly 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 forelectrician.3.The power rating of this product is indicated on the serial number/rating plate. Never connect this product tothe 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 drivingmotors 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 Head 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.6.To prevent the circuit boards from short-circuiting, be careful about the following when handling FFC orcables.⏹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 avoidslant insertion.7.In order to protect sensitive microprocessors and circuitry, use static discharge equipment, such as anti-staticwrist straps, when accessing internal components.8.Do not tilt this product immediately after initial ink charge, especially after performing the ink charge severaltimes. 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 withsoap 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 partswith sharp edges.e 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 parts14.Never use oil or grease other than those specified in this manual. Use of different types of oil or grease maydamage 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 theink cartridges 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 whichsecure 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 tothe corresponding attachment positions on the new one referring to the labels on the returned product.About This ManualThis 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. TROUBLESHOOTINGDescribes the step-by-step procedures for the troubleshooting.CHAPTER 2. DISASSEMBLY / REASSEMBLYDescribes the disassembly/reassembly procedures for main parts/units of the product, and provides the standard operation time for servicing the product.CHAPTER 3. ADJUSTMENTDescribes the required adjustments for servicing the product.CHAPTER 4. MAINTENANCEDescribes maintenance items and procedures for servicing the product.CHAPTER 5. REFURBISHMENTDescribes refurbishing work of the product and its purpose.CHAPTER 6. APPENDIXProvides the following additional information for reference:∙Connector Diagram∙Protection for TransportationSymbols Used in this ManualVarious 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 serious injury or loss of life.Indicates an operating or maintenance procedure, practice, or condition that, if not strictly observed,could result in bodily injury, damage or malfunction of equipment.May indicate an operating or maintenance procedure, practice or condition that is necessary toaccomplish a task efficiently. It may also provide additional information that is related to a specificsubject, or comment on the results achieved through a previous action.For Chapter 2 “Disassembly/Reassembly”, symbols other than indicated above are used to show additional information for disassembly/reassembly. For the details on those symbols, see "2.3 Disassembly/Reassembly Procedures (p47)".Revision StatusRevision Date of Issue DescriptionA Mar 10, 2017First ReleaseB May 26, 2017Revised□Chapter 2　■　Made change in "2.3 Disassembly/Reassembly Procedures (p47)" ・　Made change in "2.3.3.1 Disassembly/Reassembly Flowchart (p49)"　■　Made change in "2.4 Detailed Disassembly/Reassembly Procedure for each Part/Unit(p54)" ・　Made change in " Housing Upper (p54)"□Chapter 3　■　Made change in "3.2 Adjustment Program (p64)" ・　Made change in "3.2.2 Adjustment and Inspection List (p64)"C December 15,2017Revised□ Chapter 1　■ Made change in "1.3 Fatal Error Code List (p13)" ・ Made change in "1.3.2.5 Printer (Head/CSIC) (p21)" “HCS error” has been added.□ Chapter 2　■ Made change in "2.1 Overview (p38)" ・ Made change in "2.1.4 Standard Operation Time for servicing the product (p42)" “Stacker Support Front Assy” has been added.　■ Made change in "2.3 Disassembly/Reassembly Procedures (p47)" ・ Made change in "2.3.3.1 Disassembly/Reassembly Flowchart (p49)" “Stacker Support Front Assy” has been added.　■ Made change in "2.4 Detailed Disassembly/Reassembly Procedure for each Part/Unit (p54)" ・ Made change in " SCN Hinge Assy (p54)" ・ Made change in " Printer Mechanism (p56)" ・" Stacker Support Front Assy (p57)" has been added.　■ Made change in "2.5 Routing FFCs/cables (p58)" ・ Made change in " Panel Assy (p58)" ・ Made change in " ADF/SCN Unit (p58)" ・ Made change in " Ink System (p58)" ・ Made change in " Power Supply Unit (p58)" ・ Made change in " Head FFC/CSIC FFC (p59)" ・ Made change in " Speaker Cable (p60)"□ Chapter 3　■ Made change in "3.2 Adjustment Program (p64)" ・ Made change in "3.2.2 Adjustment and Inspection List (p64)" ・ Made change in "3.2.3 Details of the Adjustment Program (p69)"Made change in “PTS delay adjustment”.　■ Made change in "3.3 Mechanism Adjustment / Check (p76)" ・ Made change in "3.3.1 Checking the Platen Gap (p76)"□ Chapter 5　■ Made change in "6.2 Protection for Transportation (p91)" ・"6.2.5 Preventing the shipping Liquid from leakage from Printhead (p95)" has been added.ContentsChapter 1 Troubleshooting1.1Troubleshooting (10)1.1.1Troubleshooting Workflow (10)1.2Power-On Sequence (12)1.3Fatal Error Code List (13)1.3.1Displaying the Fatal Error Code (13)1.3.2Fatal Error Code (14)1.3.2.1ADF/Scanner (14)1.3.2.2Printer (CR) (17)1.3.2.3Printer (PF) (18)1.3.2.4Printer (I/S) (20)1.3.2.5Printer (Head/CSIC) (21)1.3.2.6Printer (Others) (22)1.3.2.7System Error (23)1.4Service Support Mode (24)1.4.1Status Sheet Information (27)Chapter 2 Disassembly/Reassembly2.1Overview (38)2.1.1Tools (38)2.1.2Jigs (38)2.1.3Locations of the Parts/Units (39)2.1.4Standard Operation Time for servicing the product (42)2.2Common cautions when disassembling/reassembling the Product (45)2.3Disassembly/Reassembly Procedures (47)2.3.1Functional differences between models and component parts (47)2.3.2Disassembly Flowchart (48)2.3.2.1Disassembly/Reassembly Flowchart (49)2.4Detailed Disassembly/Reassembly Procedure for each Part/Unit (54)2.5Routing FFCs/cables (58)Chapter 3 Adjustment3.1Required Adjustments (62)3.2Adjustment Program (64)3.2.1Operating Environment (64)3.2.2Adjustment and Inspection List (64)3.2.3Details of the Adjustment Program (69)3.3Mechanism Adjustment / Check (76)3.3.1Checking the Platen Gap (76)3.3.1.1Preparation (76)3.3.1.2Confirmation procedure (78)3.3.2MAC Address Setting (79)Chapter 4 Maintenance4.1Cleaning (81)4.1.1Cleaning the CR Unit (81)4.1.2Cleaning the Exterior Parts/inside of the printer (82)4.2Lubrication (83)4.2.1Lubrication Points and Instructions (84)Chapter 5 Refurbishment5.1Overview (88)5.1.1Ink Discharge (88)Chapter 6 Appendix6.1Connector Diagram (90)6.2Protection for Transportation (91)6.2.1Securing the CR Unit (91)6.2.2Securing the SCN/ADF Unit (92)6.2.3Securing the Panel Unit (93)6.2.4Securing the ADF Paper Support (94)6.2.5Preventing the shipping Liquid from leakage from Printhead (95)CHAPTER1TROUBLESHOOTINGEPSON WF-3720 Series Revision C1.1 TroubleshootingThis section describes the troubleshooting workflow.1.1.1 Troubleshooting WorkflowThe following page describes the troubleshooting workflow. Follow the flow when troubleshooting problems.Figure 1-1.Troubleshooting Workflow (1)⏹This flowchart is compiled based on the following contents.•Our experience regarding the quality problem•ESK’s repair data•Printer Mechanism specification for WF-3720 Series⏹If the reason for the return is evident, first check the phenomenon user claims recurs,then proceed to the troubleshooting.5What is returned reason?2Standby condition 3Is printing operationfinished without error?StartTurn on the printer 14(p 11)(p 11)(p 11)(p 11)(p 11)Copy an image*:In case of “Not Trouble Found”, check fatal error code.6(p 11)ADF/Scannerunit failurePrinter failure only Yes No YesNo Yes Yes No Yes Yes NoNo No No Yes Does printer turn on thepower?Is Power-on sequencefinished without error?Print check pattern Is printing operationfinished without trouble?Is scanning operationfinished withouttrouble?Is ADF operation finished without trouble?Copy an image by ADFADF failure?Finish *EPSON WF-3720 Series Revision CFigure 1-2.Troubleshooting Workflow (2)The power-on sequence does not start (p 10)Error is indicated during power-on sequence (p 10)Error is indicated during printing nozzle check pattern (p 10)Fatal errorPlease refer to " 1.3 Fatal Error Code List (p13)" for troubleshooting.Maintenance error[Occurrence Condition]This error occurs when maintenance counter inEEPROM exceeds the specified value.[Major Occurrence Timing]•Power-on timing •Print start timing •Paper eject timing •Cleaning timing•Ink cartridge replacement timing [Major Troubleshooting]•Replace Maintenance Box •Paper Guide Lower Porous Pad replacement•Maintenance counter reset (only Paper Guide Lower Porous Pad)Ink End error[Occurrence Condition]This error occurs when ink in Ink cartridge is empty.[Major Occurrence Timing]•Power-on timing •Print start timing •Print timing •Cleaning timing•Ink cartridge replacement timing [Major Troubleshooting]Ink cartridge replacement [NOTE]If an error occurs during printing, the page where the error occurred is skipped and the printing resumes from the next page.Ink cartridge detection error[Occurrence Condition]This error occurs when Inkcartridge data is incorrect or Ink cartridge is not recognized correctly.[Major Occurrence Timing]•Power-on timing •Print start timing •Cleaning timing•Ink cartridge replacement timing [Major Troubleshooting]•Remove and reinstall Ink cartridge.•Ink cartridge replacement •CSIC Terminal replacement •CR Contact Module replacement•Head FFC replacement •Main Board replacementPaper Jam errorThis error occurs when printing the nozzle check pattern. please refer to " Paper Jam error".No Power *[Presumable Cause]•Power Supply Unit damage•Main Board damage •Panel Unit damage [Major Troubleshooting]•Power Supply Unit replacement •Main Board replacement•Panel Unit replacement2* : If the printer can turn on but turns off right away, the protection circuit may cut off the power due to an error such as a circuit failure.1No Ink cartridge error[Occurrence Condition]This error occurs when Ink cartridge is not installed.[Major Occurrence Timing]At power-on[Major Troubleshooting]Install Ink cartridgeCR fixing material error[Occurrence Condition]When the printer moves to the 80-digit side during the power-on sequence before initial ink charge, the printer detects foreign material.[Major Occurrence Timing]Power-on timing(before initial ink charge)[Major Troubleshooting]Remove the CR fixing material, and install the ink cartridge.Paper Jam error[Occurrence Condition]This error occurs when top/bottom of paper is not detected by PE Sensor in the specified steps of paper feeding operation correctly.[Major Occurrence Timing]•Power-on timing •Paper loading timing •Paper eject timing •Duplex print timing[Major Troubleshooting]1Remove the jammed paper by opening Scanner Unit or Printer Cover.2Push “Start” button.3If not resolved by 2), check the following.•Foreign material, bits of paper •Part come-off •PE Sensor Lever •PE Sensor•Float of Paper Guide Front Porous Pad •Main Board •PW Sensor [NOTE]* If an error occurs during printing, the page where the error occurred is skipped and the printing resumes from the next page.* If an error occurs during duplex printing, the following are performed.•If an error occurs during the front face of duplex printing, the page where the error occurred and the next page are skipped and the printing resumes from the page after the next.•If an error occurs during the back face of duplex printing, the page where the error occurred is skipped and the printing resumes from the next page.No Paper error[Occurrence Condition]This error occurs when top of paper is not detected by PE Sensor in the specified steps of paper loading operation correctly.[Major Occurrence Timing]Paper loading timing[Major Troubleshooting]1Put paper in cassette and push “START” button.2If a paper stops before reaching PE Sensor, remove it and check the paper condition.3A)If no damage on the paper, set edge guide correctly after putting paper in cassette and push “PRINT” button again.B)If damage on the paper, check foreign materials / parts come- off / parts transformation in paper path.4If not resolved by 3-A) & 3-B), check the following.•Pickup Roller •Duplex Unit •PE Sensor Lever •Main Board •PF Motor •Cassette AssyDouble Feed error/Stack col-lapsed error[Occurrence Condition]This error occurs on the following cases.• A paper is ejected without printing during paper loading operation.•Actual paper length is longer than theoretical one. [Major Occurrence Timing]Paper loading timing[Major Troubleshooting]•Set the paper again.•PE Sensor Lever replacement •PE Sensor replacement •PW Sensor replacement •Main Board replacement [NOTE]This error occurs only for manual duplex print.No Paper Cassette error[Occurrence Condition]This error occurs if one of the cassettes is not installed.[Major Occurrence Timing]Paper loading timing (Front loading)[Major Troubleshooting]Install the Cassette Assy.3Paper Size Unmatch error[Occurrence Condition]This error occurs when actual paper size is not matched to theoretical one.[Major Occurrence Timing]•Duplex print timing •FAX data print timing [Major Troubleshooting]1Put correct sized paper in cassette, and push “START” button.2If not resolved by step 1), check the following points.•PE Sensor Lever •PE Sensor •PW Sensor •Main BoardProblems related to print result or during printing (p 10)Scanning cannot be performedsuccessfully (p 10)ADF does not operatenormally (p 10)Poor Printing[Phenomenon]•Poor printing quality •Ink stain on paper •Dot missing•Paper eject without printing [Presumable Cause]•Driver / Panel mis-setting •Contamination of CR scale •Contamination of Printhead Cover•Printhead damage•Ink clogging of Printhead •Contamination on Cap Unit / Wiper of Ink system Assy •Ink system Assy damage •Float of Paper Guide Front Porous Pad •Narrow PG•PE Lever damage •PE Sensor damage •PW Sensor damage[Major Troubleshooting]•Driver / Panel re-setting •CR Scale replacement •Printhead cover cleaning •Printhead cleaning•Ink cartridge replacement •Printhead replacement•Rubber cleaning of Cap Unit of Ink system Assy•Ink system Assy replacement •Paper Guide Front Porous Pad re-installation •PG readjustment •Printer Mechanism replacement•PE Lever replacement •PE Sensor replacement •PW Sensor replacement •Main Board replacementPoor Paper Loading[Presumable Cause]•Use of 3rd party media •Edge guide mis-setting •Foreign material •Part come-off•Contamination of paper feed roller (Duplex Unit) •Cassette Assy damage•Pickup Roller deterioration, contamination•Contamination of PF roller [Major Troubleshooting]•Recommendation of EPSON media•Edge guide re-setting •Foreign material removal •Part re-installation •PF Roller replacement •Cassette Assy replacementAbnormal Noise[Presumable Cause]•Foreign material •Insufficient grease •Gear damage[Major Troubleshooting]•Foreign material removal •Lubrication of grease •Gear replacementADF failure[Phenomenon]•No paper feed •Double feed •Paper jam •Paper skew[Presumable Cause]•Wear of Pickup Roller •Wear of ADF Pad Assy •Gear damage•Scanner Motor damage•Contamination of Scanner Glass •ADF Paper Support Assy damage•Foreign material•ADF Cover Assy damage •Wear of EJ Roller •ADF Sensors damage [Major Troubleshooting]•ADF Cover Assy replacement •ADF Pad Assy replacement •Scanner Glass cleaning •ADF Paper Support Assy replacement•Foreign material removal •Scanner Unit replacement •ADF Unit replacement45Scanner failure[Presumable Cause]•Contamination of Scanner Glass•Contamination of Document Pad•CIS Unit bonding failure •CIS Unit damage•Scanner Motor damage [Major Troubleshooting]•Scanner Glass cleaning •Document Pad cleaning •Document Pad replacement •Scanner Unit replacement61.2 Power-On SequenceThis section describes the power-on sequences for this product. The preconditions are as follows.☐Normal power-on sequence (See Table 1-1.)⏹Turning on the printer after turning it off without an error and the power was turned off normally at the previousshut down.⏹Initial ink charge has finished and every cartridge has sufficient ink.⏹No paper on the paper path.⏹The Printhead is capped by the cap of the Ink System.⏹CR Lock is engaged normally.⏹Maintenance error recovery has never been performed.Table 1-1.Power-on SequenceRed:CR lock is setWhite:CR lock is released*2:If it cannot be initialized, the fatal error occurs.*3:Executed when the detected temperature is under 5 o C (41o F) by the thermistor on the Printhead.*4:The cleaning or empty suction operation may occur depending on situations.1.3 Fatal Error Code ListThis section describes how to check the fatal error code, description, and the possible causes.1.3.1 Displaying the Fatal Error CodeThe fatal error code is stored in the EEPROM on the Main Board and can be read out using the Adjustment Program. This product displays a printer fatal error code automatically on the panel LCD when a printer fatal error occurs.Figure 1-3.Displaying the Fatal Error CodeError CodeLCD display screen image1.3.2 Fatal Error CodeThis section describes the fatal error code and the possible cause for this product.☐" ADF/Scanner (p14)"☐" Printer (CR) (p17)"☐" Printer (PF) (p18)"☐" Printer (I/S) (p20)"☐" Printer (Head/CSIC) (p21)"☐" Printer (Others) (p22)"☐" System Error (p23)"1.3.2.1ADF/ScannerError code Error name Possible cause Confirmation procedureConnectorNo.100016HP detectionfailure⏹The scanner CR could not return to its home.1.Damage or disengaging of wheel train of thedrive mechanism2.Disengaging, fraying, jumping of the timing belt⏹Failed to read the white standard/home patterns3.Disconnection, break, skew or damage of thescanner FFC4.Failure of the CIS unit5.Failure of the scanner housing6.Failure of the main board1.With the document cover opened, turn thepower on.2.Check if the CIS moves to the left to readthe white standard/home patterns.3.Check if the CIS's emission color is white(not greenish, reddish, or bluish).If the light does not look like white, checkthe scanner FFC for damage,disconnection or skew.4.Replace the scanner unit with a new one.5.Replace the main board with a new one.Main boardCN804CN801100017Contactdetectiondistanceexceeded⏹The scanner CR cannot completely reach the home(left side)1.Damage or disengaging of wheel train of thedrive mechanism⏹Failed to read the scanner encoder2.Damage or skew of the scanner FFC3.Failure of the CIS unit4.Failure of the scanner housing5.Failure of the main board1.With the document cover opened, turn thepower on.2.Check if the CIS (CR) reaches (comes incontact with) the left side.3.Check the wheel train of the drivemechanism for damage.4.Check the scanner FFC for damage,disconnection or skew.5.Replace the scanner unit with a new one.6.Replace the main board with a new one.Main boardCN804CN801100018Opposite sidecontactdetectiondistanceexceeded error⏹The scanner CR cannot completely reach theopposite side of the home (right side)1.Damage or disengaging of wheel train of thedrive mechanism⏹Failed to read the scanner encoder2.Damage or skew of the scanner FFC3.Failure of the CIS unit4.Failure of the scanner housing5.Failure of the main board1.With the document cover opened, turn thepower on.2.Check if the CIS (CR) reaches (comes incontact with) the right side.3.Check the wheel train of the drivemechanism for damage.4.Check the scanner FFC for damage,disconnection or skew.5.Replace the scanner unit with a new one.6.Replace the main board with a new one.Main boardCN804CN801100020Measurementerror⏹Overload of the scanner drive mechanism⏹Failure of the scanner motor1.Check if the CIS (CR) moves or not.1)Check the timing belt for fraying orlooseness.2)Check the wheel train of the drivemechanism for damage.3.Replace the scanner unit with a new one.4.Replace the main board with a new one.---100032LED lightfailure⏹Failure of the CIS LED light (RGB)1.Disconnection, break, skew or damage of thescanner FFC2.Failure of the CIS unit3.Failure of the main board1.Check the color of the LED at power-on.2.Check the scanner FFC for damage,disconnection or skew.3.Replace the scanner unit with a new one.4.Replace the main board with a new one.Main boardCN801100054Paper jam error ⏹No jammed paper is remaining but the sensor doesnot turn off1.Failure of the ADF PE sensor2.Failure of the cable⏹Jammed paper is remaining⏹The paper feed rollers and paper conveying rollersslip too much☐At power-on, during paper feed, during scanning1.Open the Cover,Paper Guide,LD,ADF andcheck if paper exist or not.2.Open the Document Support ADF andcheck if paper exist or not.3.Open the ADF and check if paper exist ornot.4.Check if the paper sensor lever moves upand down.5.Replace the ADF unit with a new one.6.Replace the scanner unit with a new one.7.Replace the main board with a new one.Main boardCN802100065FB PID excessspeed error⏹Failed to read the scanner encoder1.Contamination of the scanner encoder scale2.Damage or skew of the scanner FFC3.Failure of the scanner encoder sensor⏹Failure of the scanner motor driver4.Failure of the main board1.Check the scanner FFC for damage,disconnection or skew.2.Replace the scanner unit with a new one.3.Replace the main board with a new one.Main boardCN804CN801100066FB PID reverseerror⏹Operation failure of the scanner motor1.The scanning operation was stopped by;•Disengaging of the scanner CR•Disengaging of the scanner motor pulley orcracking of the scanner motor gears⏹Failed to read the scanner encoder2.Contamination of the scanner encoder3.Damage or skew of the scanner FFC4.Failure of the scanner encoder sensor5.Failure of the main board1.Check the scanner FFC for damage,disconnection or skew.2.Replace the scanner unit with a new one.3.Replace the main board with a new one.Main boardCN804CN801100067FB PID lockerror⏹The scanner motor did not run1.The scanning operation was stopped by;•Disengaging of the scanner CR•Disengaging of the scanner motor pulley orcracking of the scanner motor gears⏹Failed to read the CR motor encoder2.Contamination of the scanner encoder3.Damage or skew of the scanner FFC4.Failure of the scanner encoder sensor5.Failure of the scanner motor6.Failure of the main board1.Check the scanner FFC for damage,disconnection or skew.2.Replace the scanner unit with a new one.3.Replace the main board with a new one.Main boardCN804CN801100068FB PIDaccelerationlock error⏹The scanner motor did not run1.The scanning operation was stopped by;•Disengaging of the scanner CR•Disengaging of the scanner motor pulley orcracking of the scanner motor gears⏹Failed to read the scanner motor encoder2.Contamination of the scanner encoder3.Damage or skew of the scanner FFC4.Failure of the scanner encoder sensor5.Failure of the scanner motor6.Failure of the main board1.Check the scanner FFC for damage,disconnection or skew.2.Replace the scanner unit with a new one.3.Replace the main board with a new one.Main boardCN804CN801100069FB PID excessload error⏹The scanner motor stopped running in the middle ofthe operation1.The scanning operation was stopped by;•Disengaging of the scanner CR•Disengaging of the scanner motor pulley orcracking of the scanner motor gears⏹Failed to read the scanner motor encoder2.Contamination of the scanner encoder3.Disconnection, break, skew or damage of thescanner FFC4.Failure of the scanner encoder sensor5.Failure of the scanner motor6.Failure of the main board1.Check the scanner FFC for damage,disconnection or skew.2.Replace the scanner unit with a new one.3.Replace the main board with a new one.Main boardCN804CN801。