Epson Scan 2500 2.2.4 Paper Feeding Mechan ism

EPSON Stylus Scan 2500 Revision A

Operating Principles Printer Mechanism Operation 40

2.2.4 Paper Feeding Mechan ism

The paper feeding process begins at th e ASF, conti nu es th r ou gh th e PF

roller, and ends at the paper eject roller (and star-wheel gear).

The ASF unit, which is common with the Stylus COLOR 740 printers, is

driven by the PF motor (stepping motor). Torque sent from this motor

switches between the ASF unit and pump/PF roller depending on the

position of the disengage lever (described later).

In the EPSON Stylus Scan 2500, a four-phase hybrid type pulse motor is

used in the PF motor as a motive power of the paper mechanism. The

torque is sent at 2-Double 1-2, Double 1-2, 1-2, and 2-2 phase drives. This

motor drives the paper-feeding mechanism as well as the pump

mechanism which is nec es s ary fo r pr in th ead cl ea ni ng. By us i ng t h is p ul se

motor, it becomes possible to use variable drive levels for many

purposes, such as paper feed, slight paper feed, and high or low speed

absorption of pump operations. The following table shows PF motor

specifications.

Figure 2-7. PF Motor Internal Circuit Diagram

Drive from the PF motor is sent to the PF rollers and paper eject rollers as

described below.

To the PF rollers:

PF motor pinion gear (CCW rotation)→ Gear 73.6 → PF rollers

PF Motor Specifications

Item Description

Motor type 4-phase/200-pole Stepping motor

Drive voltage 42VDC ± 5%

Coil Resistance 7.8 Ohms ± 10%(per 1 phase under 25°C

environment)

Control method Bi-Polar Drive

Phase drive 1- 2, 2-2, Double 1-2, 2-Double 1-2

Phase drive

Phase Drive Inch/pulse mm/pulse

2-2 1/720 0.035

1-2 1/1440 0.018

Double 1-2 1/2880 0.0088

2-Double 1-2 1/5760 0.0044

Motor Control for Each Mode

Printing mode Drive Speed

[CPS] Drive frequency

[PPS] Drive method

High Speed Skip 340 4080 Double 1-2, 2-2,1-2

phase drive*

Normal Printing 200 2400 Double 1-2, 2-2 phase

drive

Capping 80 960 2-Double 1-2, 2-2 phase

drive

Wiping 40 480 2-Double1-2, 2-2 phase

drive

Cap (Valve

Release) 20 240 4-Double1-2, 2-2 phase

drive

Withdrawal of cap 560 4-Double 1-2, 2-2 phase

drive

Rotor

1

2

3

4

A

/A

B

/B

Contents

Main Notice: PRECAUTIONS WARNING CAUTION PREFACE Page Page Contents Product Description Operating Principles Troubleshooting Disassembly & Assembly Adjustment Maintenance Appendix Page Product Description Features 10 1.1 Features 1.2 General Specifications 1.2.1 Local copy Table 1-1. Local Copy Specifications Product Description General Specifications 11 1.2.2 Scan area Figure 1-1. Scan Area Table 1-2. Scan Area Product Description General Specifications 12 1.2.3 Print area Figure 1-2. Print Area Table 1-3. Print Area Product Description General Specifications 13 1.2.4 Printing 1.2.5 Input data buffer 1.2.6 Control codes 1.2.7 Paper feed Table 1-4. Character code 1.2.8 Paper Figure 1-3. Printable Area for Envelopes Table 1-6. Envelope Margin Product Description General Specifications 15 1.2.9 Ink Figure 1-4. Black Ink Cartridge Figure 1-5. Color Ink Cartridge Product Description Scanner 16 1.3 Scanner Product Description Common 17 1.4 Common 1.4.1 Electrical specifications 1.4.2 Safety, EMC Product Description Common 18 1.4.3 Environmental conditions Figure 1-6. Humidity and Temperature 1.4.4 Resistance to electric noise 1.4.5 Reliability 1.4.6 Acoustic noise 1.5 Interfaces 1.5.1 Printer Interface PARALLEL Product Description Interfaces 20 USB Figure 1-7. USB Pin Configuration PREVENTING DATA TRANSFER TIME-OUT OF HOSTS INTERFACE SELECTION 1.5.2 Scanner interfaces PARALLEL Product Description Interfaces 22 USB Table 1-8. Scanner Configuration for USB Product Description Control Panel 23 1.6 Control Panel Figure 1-8. Control Panel 1.6.1 Buttons Table 1-9. Button functions Table 1-10. Power-on functions Product Description Control Panel 24 COPY BUTTON Figure 1-9. LCD and Button Relationship Table 1-12. Copy button functions EPSON Stylus Scan 2500 Revision A Product Description Control Panel 25 Table 1-12. Copy button functions (cont.) Product Description Control Panel 26 1.6.2 Indicators and LCD Display Table 1-14. LCD display and LED indicators Table 1-14. LCD display and LED indicators (cont.) Product Description Control Panel 27 1.6.3 Initialization PRINTER INITIALIZATION Table 1-15. Initialization Product Description Settings Menu 28 SCANNER INITIALIZATION 1.7 Settings Menu Table 1-16. Settings Menu Product Description Stylus Scan Errors 29 MENUS 1.8 Stylus Scan Errors PRINTER-SPECIFIC ERRORS Table 1-17. Printer-SPECIFIC errors Product Description Options 30 SCANNER-SPECIFIC ERRORS 1.9 Options 1.9.1 Local Copy ADF TPU 1.9.2 Scanning ADF Page Page Page Operating Principles General 34 2.1 General 2.2 Printer Mechanism Operation Motor Types and Corresponding Functions Operating Principles Printer Mechanism Operation 35 Figure 2-1. Printer Mechanism Block Diagram 2.2.1 Printing Mechanism Page 2.2.2 Printing Process Operating Principles Printer Mechanism Operation 38 2.2.3 Carriage Mechanism and M otor Figure 2-5. CR Motor Internal Circuit Diagram Carriage Motor Specifications Phase drive CR Motor Control for Each Mode Operating Principles Printer Mechanism Operation 39 PLATEN GAP LEVER Figure 2-6. Carriage Mechanism with platen gap lever (Top view) Operating Principles Printer Mechanism Operation 40 2.2.4 Paper Feeding Mechan ism Figure 2-7. PF Motor Internal Circuit Diagram PF Motor Specifications Phase drive Motor Control for Each Mode Operating Principles Printer Mechanism Operation 41 Figure 2-8. Paper Feeding Mechanism (Top View) Operating Principles Printer Mechanism Operation 42 MULTI-FEED PREVENTION MECHANISM Figure 2-9. Multiple Paper Loading Prevention Mechanism (right side view) Operating Principles Printer Mechanism Operation 43 SMALLER TRAILING-EDGE MARGIN Figure 2-10. 3mm improved margin (viewed from right side) Operating Principles Printer Mechanism Operation 44 CARRIAGE LOCK MECHANISM Figure 2-11. CR Lock Mechanism Operating Principles Printer Mechanism Operation 45 PAPER PICK-UP OPERATION Figure 2-12. Paper Pickup Mechanism Operating Principles Printer Mechanism Operation 46 2.2.5 Ink System Figure 2-13. Ink System Mechanism Figure 2-14. Major Ink Sequence Positions on Carriage 2.2.6 Pump, Carriage Lock, Head Cleaner Mechanism Operating Principles Printer Mechanism Operation 47 Pump Motor Rotation and Function Pumping modes Operating Principles Printer Mechanism Operation 49 2.2.7 Cap Mechanism Figure 2-17. Cap mechanism and valve operation EPSON Stylus Scan 2500 Revision A Operating Principles Scanner Principles 50 2.3 Scanner Principles Figure 2-19. Mirror, Lens Mechanism 2.3.1 Carriage Unit Figure 2-18. Carriage Unit Component 2.3.2 Carriage Operation Operating Principles Local and PC Copy Principles 52 2.4 Local and PC Copy Principles 2.4.1 Local copy process Stylus Scan 2500 Local Copy Operating Principles Local and PC Copy Principles 53 2.4.2 PC copy process 2.4.2.1 Normal PC copy 2.4.2.2 Original color copy PC Copy Settings Operating Principles Electrical Circuit Operating Principles 54 2.5 Electrical Circuit Operating Principles Figure 2-21. Electric Circuit of Stylus Color 2500 2.5.1 B102 PSB/PSE Board Application of DC Voltage Operating Principles Electrical Circuit Operating Principles 56 Figure 2-22. B101 PSB/PSE Board Block Diagram 2.5.2 B102 MAIN Board Printer Block System & Scanner Block Local Copy Block Page Page Troubleshooting Unit Level Troubleshooting 61 3.1 Unit Level Troubleshooting Figure 3-1. Troubleshooting Process Flowchart Table 3-1. Printer Condition and Panel Status Troubleshooting Unit Level Troubleshooting 62 3.1.1 Printer/Scanner doe s no t operate at power on Flowchart 3-1. Table 3-2. Symptoms and Problem s Start Troubleshooting Unit Level Troubleshooting 63 3.1.2 Error is detected Flowchart 3-3. Flowchart 3-2. 3.1.3 Failure occurs during printing Troubleshooting Unit Level Troubleshooting 64 3.1.4 Printer does not feed pape r correctly Flowchart 3-5. Flowchart 3-4. 3.1.5 Control panel operation is abnormal START 3.2 Printer Related Troubleshooting Table 3-3. Printer-Specific errors Error Cause Solution Troubleshooting Printer Related Troubleshooting 66 Table 3-4. Repair of the Printer Mechanis m Troubleshooting Printer Related Troubleshooting 67 Table 3-4. Repair of the Printer Mechanism (cont.) Troubleshooting Printer Related Troubleshooting 68 Table 3-4. Repair of the Printer Mechanism (cont.) Page Troubleshooting Scanner Troubleshooting 70 3.3 Scanner Troubleshooting Table 3-5. User-level Scanner-Specifi c errors Error Cause Solution Table 3-6. Service Level Troubleshooting Starts Here Table 3-7. Power problems Troubleshooting Scanner Troubleshooting 71 Table 3-8. Scanner does not initialize Table 3-7. Power problems (cont.) Troubleshooting Scanner Troubleshooting 72 Table 3-9. Carriage Unit does not operate (cont.) Table 3-11. The lamp does not light up. Troubleshooting Scanner Troubleshooting 73 Table 3-12. Poor image quality Table 3-13. SCSI Interface Error Table 3-14. Parallel Interface Error Table 3-15. Option unit malfunction 3.4 Troubleshooting Motors and Sensors Table 3-16. Motor Resistance and Measurement Procedure Table 3-17. Sensor Check Page 4.1 Overview 4.1.1 Precautions for Disassembling the Printer Page Disassembly & Assembly Overview 77 4.1.2 Tools 4.1.3 Specification for Screws Table 4-1. Tool Lis t Table 4-2. Screw Characteristics Page Disassembly & Assembly Overview 79 4.1.4 Service Checks After Repair Table 4-4. Inspection Checklist for the Stylus Scan Disassembly & Assembly Overview 80 Table 4-4. Inspection Checklist for the Stylus Scan Disassembly & Assembly Disassembly Procedures 81 4.2 Disassembly Procedures Page 4.3.2 Removing the top cover 4.3.3 Removing the control panel assembly Disassembly & Assembly Removing the Housing 84 4.3.4 Removing the side covers 4.3.5 Removing the scanner support frame Disassembly & Assembly Removing the Housing 85 4.3.6 Removing the paper eject assembly Disassembly & Assembly Removing the Housing 86 4.3.7 Removing the power supply board upper frame Disassembly & Assembly Removing the Housing 87 4.3.8 Removal of the B102 PSB/PSE Board 4.3.9 Removing the printer mechanism Page 4.4 Removal of the Circuit Board Tray Page 4.5.1 Removing the waste ink pads 4.5.2 Removing the cleaning assembly (Pump and Cap) Disassembly & Assembly Removal of the Printer Consumables 94 Page 4.6 Disassembling the Printer Mechanism 4.6.1 Removing the Printhead Unit Disassembly & Assembly Disassembling the Printer Mechanism 97 Figure 4-3. Removing the Print Head Figure 4-4. Installing the Printhead 4.6.2 Removing the PF Motor Assembly 4.6.3 Removing the CR Motor Assembly 4.6.4 Removing the ASF Assembly 4.6.4.1 Disassembling t he ASF Roller Assembly Page 4.6.4.2 Removing the Right and Left LD Roller Assembly 4.6.5 Removing the Carriage Assembly Page 4.6.6 Removing the PF Roller Assembly Page 4.6.7 Removing the PE Paper Detector Assembly 4.6.8 Removing the HP Detector 4.7 Disassembly of the Scanner Mechanism Disassembly & Assembly Disassembly of the Scanner Mechanism 110 4.7.1 Removing the scanner 4.7.1.1 Removing the lamp Disassembly & Assembly Disassembly of the Scanner Mechanism 111 4.7.1.2 Removing the scanner power supply board 4.7.1.3 Removing the scanner assembly from the scanner guide shaft 4.7.2 Removing the scanner motor Page Adjustment Required Adjustments 113 5.1 Required Adjustments Table below shows the actions taken and required adjustments in the order to be performed. Table 5-1. List of Service Procedures That Require Adjustment Table 5-2. List of Required Adjustments Adjustment Printer Adjustment 114 5.2 Printer Adjustment 5.2.1 Printer hardware adjustments 5.2.1.1 Parallelism Adjustment [RIGHT PARALLELISM ADJUSTMENT] Table 5-3. Adjustment Tools Required Adjustment Printer Adjustment 115 [LEFT PARALLELISM ADJUSTMENT] Figure 5-1. Setting the Parallelism-Adjustment Gauge [CHECKING PARALLELISM] [FIXING PARALLELISM ADJUSTMENT BUSHING] 5.3 Using the Service-Adjustment Program 5.3.1 Installing the program Adjustment Using the Service-Adjustment Program 117 5.3.2 Openning the Start-up me nu Figure 5-4. Inital Menu HEAD ID MENU Table 5-4. Software-based Adjustment Procedures Table 5-5. Service Menu Items Page Page Page Page Adjustment Using the Service-Adjustment Program 122 5.3.3 Initial Ink Charge Operation 5.3.4 Bi-D Adjustment Adjustment Using the Service-Adjustment Program 123 Figure 5-7. Bi-D ADjustment Pattern Sample 5.3.5 Head Cleaning Operation Adjustment Using the Service-Adjustment Program 124 5.3.6 Head Voltage ID Input 5.3.7 Head Angular Adjustmen t Adjustment Using the Service-Adjustment Program 125 Figure 5-8. Sample of Head Angular Adjustment Pattern Figure 5-9. Screw Position Figure 5-10. Lever Operation Adjustment Scanner Adjustment 126 5.4 Scanner Adjustment Page Maintenance Overview 129 6.1 Overview 6.1.1 Cleaning 6.1.2 Lubrication 6.1.2.1 Scanner lubrication points 6.1.2.2 Printer lu brication points Maintenance Overview 130 Table 6-4. Lubrication Points Maintenance Overview 131 Page Page Page Page Page Maintenance Overview 137 Page 6.1.2.3 Scanner Mechanism Page Appendix Connector 141 7.1 Connector CN12 CN6 Figure 7-1. Cable Connections for Stylus Scan 2500 CN11 CN10 7.1.1 Board Connector Summary Table 7-1. Circuit Board Connector Summary (cont.) Appendix Connector 143 7.1.2 Connector Pin Assignment Table 7-3. Connector Pin Assignment-CN4 Table 7-4. Connector Pin Assignment-CN5 Table 7-5. Connector Pin Assignment-CN6 Table 7-6. Connector Pin Assignment-CN7 Appendix Connector 144 Table 7-7. Connector Pin Assignment-CN8 Table 7-8. Connector Pin Assignment-CN9 Table 7-9. Connector Pin Assignment-CN10 Table 7-10. Connector Pin Assignment-CN11 Appendix Connector 145 Table 7-11. Connector Pin Assignment-CN12 Table 7-12. Connector Pin Assignment-CN13 Table 7-13. Connector Pin Assignment-CN1 4 Table 7-14. Connector Pin Assignment-CN15 7.2 EEPROM Address Map This section provides EEPROM address map for the Stylus Scan. Table 7-15. Printer Unit EEPROM Address Map Appendix EEPROM Address Map 147 Appendix EEPROM Address Map 148 Appendix EEPROM Address Map 149 Appendix EEPROM Address Map 150 Appendix EEPROM Address Map 151 Appendix Exploded Diagrams 152 7.3 Exploded Diagrams This section contains the following exploded diagrams. Versio n EPSON STYLUS SCAN 2500 No.1 123 401 400 400 400 EPSON STYLUS SCAN 2500 No.2 EPSON STYLUS SCAN 2500 No.3 EPSON STYLUS SCAN 2500 No.4 EPSON STYLUS SCAN 2500 No.5 EPSON STYLUS SCAN 2500 No.6 EPSON STYLUS SCAN 2500 No.7 EPSON STYLUS SCAN 2500 No.8 PACKING MATERIAL FOR EPSON STYLUS SCAN 2500 Rev.01 10138 Appendix Parts List 162 7.4 Parts List Appendix Parts List 163 Appendix Parts List 164 Appendix Parts List 165 Appendix Parts List 166