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SERVICE MANUAL
All-in-one printer, scanner, and copier
EPSON STYLUS Scan 2500
®
SEIJ99007
EPSON STYLUS Scan 2500
Revision A
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. The contents of this manual are subject to change without notice. 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 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.
General 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 © 1999 SEIKO EPSON CORPORATION. Printed in Japan.
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EPSON STYLUS Scan 2500
Revision A
PRECAUTIONS
There are cautionary notes throughout the text to help you avoid personal injury or equipment damage.
W A R N IN G
Signals a precaution which, if ignored, could result in serious or fatal personal injury. Great caution should be exercised in performing procedures preceded by a WARNING heading.
C A U T IO N
Signals a precaution which, if ignored, could result in damage to equipment.
Always observe the measures listed below when performing repair or maintenance procedures.
WARNING
1. 2. 3. Always disconnect the product from both the power source and host computer before performing any maintenance or repair procedure. No work should be performed on the unit by persons unfamiliar with basic safety measures dictated for all electronics technicians in their line of work. In performing testing described in this manual, do not connect the unit to a power source until instructed to do so. When the po wer supply cable must be connected, use extreme caution in working on the power supply and other electronic components.
CAUTION
1. 2. 3. 4. 5. Repairs on EPSON products should be performed only by an EPSON-certified repair technician. Make certain that the source voltage is the same as the rated voltage listed on the serial number/rating plate. If the EPSON product has a primary AC rating different from the available power source, do not connect it to the power source. Always verify that the EPSON product has been disconnected from the power source before removing or replacing printed circuit boards and/or individual chips. To protect sensitive microprocessors and circuitry, use static discharge equipment, such as anti-static wrist straps, when acces sing internal components. Replace malfunctioning components only with those components recommended by the manufacturer; introduction of second-source ICs or other nonapproved components may damage the product and void any applicable EPSON warranty.
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EPSON STYLUS Scan 2500
Revision A
PREFACE
This manual describes basic functions, theory of electrical and mechanical operations, maintenance and repair procedures of EPSON STYLUS Scan 2500. The instructions and procedures included herein are intended for the experienced repair technicians, and attention should be given t o the precautions on the preceding page. The chapters are organized as follows:
CHAPTER 1. CHAPTER 2.
"Product Description" "Operating Principles"
Provides a general overview and specifications of the product.
Describes the theory of electrical and mechanical operations of the product.
CHAPTER 3. CHAPTER 4.
"Troubleshooting" "Disassembly & Assembly"
Provides step-by-step procedures for troubleshooting.
Describes step-by-step procedures for disassembling and assembling the product.
CHAPTER 5. CHAPTER 6.
"Adjustment" "Maintenance"
Provides Epson-approved methods for adjustment.
Provides preventive maintenance procedures and the lists of Epsonapproved lubricants and adhesives required for servicing the product.
CHAPTER 7.
"Appendix"
Provides the following additional information for reference: · EEPROM Address Map · Connector Pin Assignment · Schematics · Circuit Diagrams
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EPSON STYLUS Scan 2500
Revision A
Revision Status
Revision Revision A Issued Date October 5, 1999 Description First release
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EPSON STYLUS Scan 2500
Revision A
6
EPSON STYLUS Scan 2500
Revision A
Contents
Product Description
Features ....................................................................................................... 10 General Specifications ............................................................................... 10 Local copy .............................................................................................. 10 Scan area................................................................................................ 11 Print area ................................................................................................ 12 Printing ................................................................................................... 13 Input data buffer .................................................................................... 13 Control codes......................................................................................... 13 Paper feed .............................................................................................. 13 Paper....................................................................................................... 14 Ink ........................................................................................................... 15 Scanner........................................................................................................ 16 Common...................................................................................................... 17 Electrical specifications......................................................................... 17 Safety, EMC............................................................................................ 18 Environmental conditions..................................................................... 18 Resistance to electric noise .................................................................. 19 Reliability................................................................................................ 19 Acoustic noise........................................................................................ 19 Interfaces ..................................................................................................... 20 Printer Interface ..................................................................................... 20 Scanner interfaces................................................................................. 22 Control Panel............................................................................................... 24 Buttons ................................................................................................... 24 Indicators and LCD Display................................................................... 27 Initialization............................................................................................ 28 Settings Menu............................................................................................. 29 Stylus Scan Errors ...................................................................................... 30 Options ........................................................................................................ 31 Local Copy.............................................................................................. 31 Scanning ................................................................................................ 31 Physical Characteristics ............................................................................. 32 Dimensions ............................................................................................ 32 Weight .................................................................................................... 32
Operating Principles
General ........................................................................................................ 34 Printer Mechanism Operation ................................................................... Printing Mechanism .............................................................................. Printing Process..................................................................................... Carriage Mechanism and Motor .......................................................... Paper Feeding Mechanism ................................................................... Ink System ............................................................................................. Pump, Carriage Lock, Head Cleaner Mechanism................................ Cap Mechanism ..................................................................................... 34 35 37 38 40 46 46 49
Scanner Principles ...................................................................................... 50 Carriage Unit.......................................................................................... 50 Carriage Operation ................................................................................ 51 Local and PC Copy Principles .................................................................... 52 Local copy process ................................................................................ 52 PC copy process .................................................................................... 53 Electrical Circuit Operating Principles ...................................................... 54 B102 PSB/PSE Board ............................................................................. 55 B102 MAIN Board .................................................................................. 57
Troubleshooting
Unit Level Troubleshooting ....................................................................... Printer/Scanner does not operate at power on................................... Error is detected .................................................................................... Failure occurs during printing.............................................................. Printer does not feed paper correctly .................................................. Control panel operation is abnormal................................................... 61 62 63 63 64 64
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EPSON STYLUS Scan 2500
Printer Related Troubleshooting ............................................................... 65 Scanner Troubleshooting .......................................................................... 69 Troubleshooting Motors and Sensors ...................................................... 73
Revision A
Adjustment
Required Adjustments ............................................................................. 113 Adjustment Tools Required................................................................ 114 Printer Adjustment ................................................................................... 114 Printer hardware adjustments............................................................ 114 Using the Service-Adjustment Program................................................. Installing the program ........................................................................ Openning the Start-up menu ............................................................. Initial Ink Charge Operation................................................................ Bi-D Adjustment .................................................................................. Head Cleaning Operation ................................................................... Head Voltage ID Input ......................................................................... Head Angular Adjustment .................................................................. Ink draining .......................................................................................... 116 116 117 122 122 123 124 124 126
Disassembly & Assembly
Overview ..................................................................................................... 75 Precautions for Disassembling the Printer .......................................... 75 Tools ....................................................................................................... 77 Specification for Screws ....................................................................... 77 Service Checks After Repair................................................................. 79 Disassembly Procedures............................................................................ 81 Removing the Housing............................................................................... 82 Removing the rear cover ...................................................................... 82 Removing the top cover........................................................................ 83 Removing the control panel assembly ................................................ 83 Removing the side covers .................................................................... 84 Removing the scanner support frame ................................................. 84 Removing the paper eject assembly.................................................... 85 Removing the power supply board upper frame ............................... 86 Removal of the B102 PSB/PSE Board .................................................. 87 Removing the printer mechanism ....................................................... 88 Removal of the Circuit Board Tray ............................................................ 90 Removal of the Printer Consumables ....................................................... 91 Removing the waste ink pads .............................................................. 92 Removing the cleaning assembly (Pump and Cap) ............................ 93 Disassembling the Printer Mechanism ..................................................... 95 Removing the Printhead Unit ............................................................... 95 Removing the PF Motor Assembly ...................................................... 97 Removing the CR Motor Assembly...................................................... 98 Removing the ASF Assembly ............................................................... 99 Removing the Carriage Assembly ..................................................... 103 Removing the PF Roller Assembly..................................................... 105 Removing the PE Paper Detector Assembly ..................................... 107 Removing the HP Detector ................................................................. 108 Disassembly of the Scanner Mechanism ............................................... 108 Removing the scanner ........................................................................ 109 Removing the scanner motor ............................................................. 111
Scanner Adjustment................................................................................. 126
Maintenance
Overview ................................................................................................... 129 Cleaning ............................................................................................... 129 Lubrication ........................................................................................... 129
Appendix
Connector.................................................................................................. 141 Board Connector Summary................................................................ 142 Connector Pin Assignment ................................................................. 143 EEPROM Address Map............................................................................. 146 Exploded Diagrams .................................................................................. 152 Parts List.................................................................................................... 162 Component Layouts ................................................................................. 167 Circuit Diagrams ....................................................................................... 172
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CHAPTER
1
PRODUCT DESCRIPTION
EPSON Stylus Scan 2500
Revision A
1.1 Features
The following specifications apply to the EPSON Stylus Scan 2500. High quality local copy Three color copy modes Normal, Fine, and Photo
1.2 General Specifications
1.2.1 Local copy
1. Local copy
V V V V V V
"Photo quality copy by Photo paper" enabled Two B/W copy modes High speed local copy Normal B/W copy mode Normal color copy mode Max. 2.4 PPM (using "Memo" pattern) Max. 1.2 PPM (using "DTP" pattern)
Normal Color Fine Photo B/W Fine
Table 1-1. Local Copy Specifications
Mode Normal Scan res. 300x300 600x300 300x300 600x600 600x600 Output mode Gray Gray Full color Full color Full color Print res. 360x360 720x720 360x360 720x720 720x720 Micro Dot Size Weave Off On Off On On Normal Variable Normal Variable Variable Head seq. Bi-D Bi-D Bi-D Bi-D Uni-D Media Normal Normal Normal Normal Photo
Normal, Fine
Local copy settings from the control panel Enlargement Multiple copies Brightness Copy size protection 50~200% 1~20 copies -2 ~ 2 (five steps)
Letter/Half Letter/5 x 8" A4/B5/A6 (Copy size protection prevents the printhead from firing ink onto the platen in cases where the paper size loaded in the printer does not match the selected paper size.)
Output mode = data from the scanner ASIC to the printer
2.
Enlargement:
PC Copy settings (determined from software application) Auto Photo Fine Auto Enlarge Auto Layout Background reduction Installed functions are the same as or equivalent to the EPSON Stylus Color 740 and the GT-7000. Small footprint 212 x 517 x 414 mm (HWD) machine only 300 x 517 x 575 mm (HWD) parts extended 4. 5. 3. Brightness one)
Default Enlargement Reduction (not continuous)
100% 120, 141, 200% 50, 70, 80, 93%
-2 (Darkest) ~ 0 (Default) ~ +2 (Lightest) (increments of
Multiple Copies 1~20 copies (one page at a time when using the ADF) Copy size Max. copy size 216 x 297mm (8.5 x 11.7inches) (Top, bottom, and both sides need 3mm margins) A4/B5/A6 (A-size version) Letter/Half Letter/5x8" (Letter size version)
Copy size protection
Product Description
Features
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EPSON Stylus Scan 2500
6. Printing paper size Normal paper A4/Letter/A5/Executive Half letter/B5/A6/Index card 5x8"/8 x10"/Post card/Legal A4/ Letter/4x5"/Post card
Revision A
Table 1-2. Scan Area
Document PW PL size (width) (length) A4 210mm 297mm 216mm 279mm LM (left) at least 3mm at least 3mm RM (right) at least 3mm at least 3mm TM (top) at least 3mm at least 3mm BM (bottom) at least 3mm at least 3mm
Photo paper
1.2.2 Scan area
PW RM LM Starting scan position (1st bit) Document edge (scale edge)
Letter
Scanning Area
TM
PL
BM
Figure 1-1. Scan Area
Product Description
General Specifications
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EPSON Stylus Scan 2500
Revision A
1.2.3 Print area
PW RM LM Paper feed direction
Document A4 Letter PW PL
Table 1-3. Print Area
LM at least 3mm at least 3mm at least 3mm at least 3mm RM at least 3mm at least 3mm at least 3mm at least 3mm TM at least 3mm at least 3mm at least 3mm at least 3mm BM at least 3mm at least 3mm at least 3mm at least 3mm
210mm 297mm 216mm 279mm 182mm 257mm 216mm 356mm
Printable Area
TM
B5 Legal
PL
BM
Figure 1-2. Print Area
Product Description
General Specifications
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EPSON Stylus Scan 2500
Revision A
1.2.4 Printing
Print method Nozzle configuration Print direction Drop On Demand ink jet monochrome 144 nozzles (48 x 3 staggered) color 48 nozzles each (cyan, magenta, yellow) Bi-direction with logic seeking
1.2.6 Control codes
ESC/P Raster Epson Remote Command
V V V V
1.2.7 Paper feed
1. 2. 3. 4. Feeding method Line spacing Paper path Feed speed Friction feed with ASF 1/6 inch or programmable at 1/360 cut-sheet 2.36 inch/sec. 4.5 inch/sec. ASF (top enter, front out) normal/ continuous fast/continuous
Print speed & printable columns
Table 1-4. Character code
Character pitch 10 CPI (Pica) Printable columns 80 LQ speed 200 CPS
Table 1-5. Raster Graphics mode
Horizontal resolution 180 dpi 360 dpi 720 dpi Printable area 8.26 inch 8.26 inch 8.26 inch Available dots 1488 2976 5952 CR speed 20 IPS 20 IPS 20 IPS
1.2.5 Input data buffer
64Kbytes
Product Description
General Specifications
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EPSON Stylus Scan 2500
Revision A
1.2.8 Paper
Cut-sheets A4 210(W) x 297mm (L) (8.3 x 11.7") Letter 216 x 279mm (8.5 x 11.0") B5 182 x 257mm (7.2 x 10.1") Legal 216 x 356mm (8.5 x 14.0") Statement 139.7 x 215.9mm (5.5 x 8.5") Executive 184.2 x 266.7mm (7.25 x 10.5") Photo paper 101.6 x 152.4mm (4 x 6") 0.08~0.11mm (0.003~0.004") 64g/m2~90g/m2 (17~24lb.) Exclusive paper, bond paper, PPC
LM
RM
thickness: weight: quality:
thickness:
thickness: weight: quality:
45g/m2~75g/m2 (12~20lb.) Plain paper, bond paper, Air mail
Product Description
General Specifications
V
V V
size:
TM
Printable Area
BM
OHP sheets, Glossy paper A4 210(W) x 297mm (L) (8.3 x 11.7") Letter 216 x 279mm (8.5 x 11.0") 0.075~0.085mm (0.003~0.0033")
size:
Figure 1-3. Printable Area for Envelopes
Envelope printing is only supported at normal temperature. Load long edge first.
NOTE: Transparency printing is only supported at normal temperature. Envelopes No.10 241(W) x 104.8mm (H) (9.5 x 4.125") DL 220 x 110mm (8.7 x 4.3") C6 162 x 114mm (6.4 x 4.5") 0.16~0.52mm (0.006~0.02")
Size #10 DL C6
Table 1-6. Envelope Margin
Left Margin (min.) 3 mm (0.12") 3 mm (0.12") 3 mm (0.12") Right Margin (min.) 28 mm (1.10") 7 mm (0.28") 3 mm (0.12") Top Margin (min.) 3 mm (0.12") 3 mm (0.12") 3 mm (0.12") Bottom Margin (min.) 14 mm (0.55") 14 mm (0.55") 14 mm (0.55")
V
size:
Index cards A6 index 105(W) x 148mm (L) (4.1 x 5.8") A5 index 148 x 210mm (5.8 x 8.3") 5x8" index 127 x 203mm (5.0 x 8.0") 10x8" index 254 x 203mm (10.0 x 8.0") less than 0.23mm (0.0091")
size:
thickness:
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EPSON Stylus Scan 2500
Revision A
2. Ink cartridge (color) Exclusive cartridge Magenta, cyan, and yellow 300 pages/A4 (360 dpi, 5% duty each color) Two years from production date -20~40°C (storage, less than a month at 40°C) -30~40°C (packing storage, less than month at 40°C) -30~60°C (transit, within 120 hours at 60°C and within a month at 40°) 42.9 (W) x 52.7 (D) x 38.5mm (H)
1.2.9 Ink
1. Ink cartridge (black) Exclusive cartridge Black 900 pages/A4 (ISO/IEC 10561 Letter pattern 360dpi Two years from production date -20~40°C (storage, less than a month at 40°C) -30~40°C (packing storage, less than month at 40°C) -30~60°C (transit, within 120 hours at 60°C and within a month at 40°) 27.8 (W) x 52.7 (D) x 38.5mm (H)
27.8
Type: Colors: Print capacity: Ink life: Storage temperature:
Type: Color: Print capacity: Ink life: Storage temperature:
Dimensions:
Dimensions:
52.7
42.9
52.7
38.5
38.5
Figure 1-5. Color Ink Cartridge Figure 1-4. Black Ink Cartridge
NOTE: Ink cartridges are consumable products and cannot by any means be refilled. Do not use cartridges that have passed their expiration date. Ink will freeze at less than -4°C but can be used after thawing for three hours at room temperature.
Product Description
General Specifications
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EPSON Stylus Scan 2500
Revision A
Line art Fixed threshold TET AAS Error diffusion three modes (A,B,C) Dither (resident) four modes (A,B,C,D) Dither (user defined) two modes (A,B) USB and IEEE1284.4 White cold cathode fluorescent lamp TPU (for GT-7000) ADF (for GT-7000)
1.3 Scanner
Product type Sub scan method Photoelectric device Max. scan area Max. effective pixels Scan resolution Output resolution Flat-bed color image scanner Movement of scan head Color CCD line sensor 8.5 x 11.7" (216 x 297mm) 5100 x 7020 pixels (600dpi) main = 600dpi sub = 1200dpi 50~4800 dpi (1dpi increments) (4800 dpi at 200% reaches the limitation of maximum 16,368 pixels at 9600 dpi for main scan)
Digital halftoning (Bi-level, Quad-level) Interface Light source Option
Scan speed (600dpi, Draft mode) Color = 8.1msec/line Monochrome (bi-level) = 2.7msec/line Color separation Command level Zoom Pixel depth Gamma correction By the CCD color filter ESC/I - B7 50~200% (1% increments) 8 bits/pixel/color (input 12 bits/pixel/color, output 8 bits/pixel/color) CRT two levels (A,B) PRINTER three levels (A,B,C) User defined = one level Impact-dot printer Thermal printer Ink-jet printer CRT display User defined Seven levels
Color correction
Brightness
Product Description
Scanner
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EPSON Stylus Scan 2500
Revision A
1.4 Common
1.4.1 Electrical specifications
Rated voltage Input voltage Rated current Rated frequency range Input frequency range Power consumption Insulation resistance Dialectic strength AC 100~120V AC 220~240V
1.4.2 Safety, EMC
Safety UL1950 (UL) CSA C22.2 No. 950 (CSA) EN60950 (VDE) IEC950 (ROSTEST, PSB) FCC Part15 Subpart B Class B CSA C108.8 Class B AS/NZS3548 Class B CISPR Pub22 Class B CNS13438 Class B Low voltage directive 73/23/EEC EMC Directive 89/336/EEC EN60950 EN55022 Class B EN61000-3-2 EN61000-3-3 EN50082-1 IEC 801-2/801-3/801-4
EMC AC 100~120V ±10% AC 220~240V ±10% 0.7A 0.4A (AC 100~120V ±10% model) (AC 220~240V ±10% model) CE Marking
50~60 Hz 49.5~60.5 Hz Approx. 32W during Local-copy printing 10M at 500V DC (between AC line and chassis) AC 1.5kV, 1min (between AC line and chassis)
Product Description
Common
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EPSON Stylus Scan 2500
Revision A
1.4.3 Environmental conditions
Temperature 10~35°C (operating, see figure below) -20~60°C (non-operating, in packaging) One month at 40°C 120 hours at 60°C 20~80% RH (operating, without condensation, see figure below) 5~85% RH (non-operating, in packaging without condensation) 1 G, within one ms (operating) 2 G, within two ms (non-operating, in packaging) 0.15G (operating) 0.50G (non-operating, in packaging)
90 80 70 60 50 40 30 20 10
1.4.4 Resistance to electric noise
Static electricity panel - 10kV metal - 7kV/150pF, 150
1.4.5 Reliability
Total print volume Printhead life Scan head 60,000 pages (A4, Letter) 4 billion dots/nozzle MCBF 30,000 cycles
Humidity
Resistance to shock Resistance to vibration
1.4.6 Acoustic noise
Level Approx. 46 dB (local copy with no ADF) Approx. 50 dB (local copy with ADF) (According to ISO7779)
Humidity (%)
10
20
27
30
35
40
Temperature (°C)
Figure 1-6. Humidity and Temperature
Product Description
Common
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EPSON Stylus Scan 2500
Revision A
Packet Refer to the IEEE-1284 Standard for Data Delivery and Logical Channels for IEEE Std. 1284.4 Interface (Draft D1.50) Refer to the IEEE-1284 specification TTL compatible level (IEEE-1284 Level 1 device) Refer to the IEEE-1284 specification
1.5 Interfaces
This section is divided into printer and scanner interface specifications. See the following section for printer interface details or see "Scanner interfaces" on pag e22 for scanner interface details.
Signal level Data trans. timing 2.
1.5.1 Printer Interface
PARALLEL
Connector pin assignment and signals Refer to the IEEE-1284 specification Data transmission timing Refer to the IEEE-1284 specification Extensibility Request: The printer responds affirmatively when the extensibility request values are 00H or 04H, which mean 00H 04H Request nibble mode reverse channel transfer Request Device ID; Return data using nibble mode reverse channel transfer
3. BUSY signal is set high before setting either -ERROR low or PE high, and held high until all these signals return to their inactive state. BUSY signal is at high level in the following cases: During data entry (see data transmission timing) When input data buffer is full During -INIT signal is at low level or during hardware initialization During printer error (see -ERROR signal) When the parallel interface is not selected 4.
Device ID: The printer sends the following device ID string when requested. IEEE 1284.4 is enabled, [00H][5EH] MFG:EPSON; CMD:ESCPL2,BDC,D4,SPC; MDL:Stylus[SP]Scan[SP]2500; CLS:PRINTER DES:EPSON[SP]Stylus[SP]Scan[SP]2500; Note: (1)[00H] denotes a hexadecimal value of zero (2)MDL value depends on the EEPROM setting.
ERROR signal is at low level when the printer is in one of the following states: Printer hardware error (fatal error) Paper-out error Paper-jam error Ink-out error
PE signal is at high level during paper-out error. 1. Specification 8 bit parallel, IEEE-1284 compatibility/nibble mode Refer to the IEEE-1284 specification Refer to the IEEE-1284 specification
Transmission mode Synchronization Handshaking
Product Description
Interfaces
T T
T T T T T T T T T
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EPSON Stylus Scan 2500
Revision A
USB
Standard :based on "Universal Serial Bus Specifications Revision 1.0" "Universal Serial Bus Device Class Definition for Printing Devices Version 1.0" :12Mbps (Full speed device) :NRZI :USB series B
PREVENTING DATA TRANSFER TIME-OUT OF HOSTS
Generally, hosts abandon data transfer to peripherals when a peripheral is continuously in the busy state for dozens of seconds. To prevent hosts from entering this kind of time-out period, the printer slows down the data reception rate to around several bytes per minute, even if the printer is in the busy state. This slowdown starts when the remaining open buffer area decreases to several hundred bytes. The Stylus Scan enters a continuous busy state if the input buffer becomes full.
Bit rate Data encoding Adaptable connector
INTERFACE SELECTION
The Stylus Scan has two built-in interfaces; the USB and parallel interfaces. The interface in use is selected automatically. Automatic selection
Suggested cable length :2 meters
Table 1-7. USB Configuration
Pin no. 1 2 3 4 Signal name VCC -Data +Data Ground In/Out Description Cable power, max. power consumption is 100mA
bi-directional data bi-directional data, pull up to +3.3V via 1.5K resistor Cable ground
Pin #3
Pin #4
Figure 1-7. USB Pin Configuration
Product Description
Interfaces
T
Pin #2
Pin #1
T
When the Stylus Scan is turned on, it initializes and then goes into an idle state. During this idle period the printer scans the interfaces for incoming data. The interface that receives data first is selected. When the host stops transferring data and the printer is in the stand-by state for a certain amount of time, the printer returns to the idle state. As long as the host sends data or the printer interface is in the busy state, the interface selection does not change. Interface status and selection
When the parallel interface is not selected, the interface goes into the busy state. When the printer initializes or returns to the idle state, the parallel interface goes into the ready state. Be aware that an interrupt signal such as the -INIT signal only takes affect on the parallel interface when the parallel interface is selected.
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EPSON Stylus Scan 2500
Revision A
IEEE1284.4 PROTOCOL
The packet protocol described by IEEE1284.4 standard allows a device to carry on multiple exchanges or conversations which contain data and/or control information with another device at the same time across a single point-to-point link. The protocol is not, however, a device control language. It does provide basic transport-level flow control and multiplexing services. The multiplexed logical channels are independent of each other and blocking of one has no effect on the others. The protocol operates over IEEE1284. Automatic Selection An initial state is compatible interface and starts IEEE1284.4 communication when magic strings (1284.4 synchronous commands) are received. On An initial state is IEEE1284.4 communication and data that received it by the time it is able to take synchronization by magic string (1284.4 synchronous commands) is discarded. Off An initial state is compatible interface and never starts IEEE1284.4 communication even if magic strings (1284.4 synchronous commands) are received.
1.5.2 Scanner interfaces
PARALLEL
1. Specification 8 bit parallel, IEEE-1284 compatibility/nibble mode Refer to the IEEE-1284 specification Refer to the IEEE-1284 specification Refer to the IEEE-1284 Standard for Data Delivery and Logical Channels for IEEE Std. 1284.4 Interface (Draft D1.50) Refer to the IEEE-1284 specification TTL compatible level (IEEE-1284 Level 1 device) Refer to the IEEE-1284 specification
Transmission mode Synchronization Handshaking Packet
V V V
Signal level Data trans. timing 2. 3.
Connector pin assignment and signals Refer to the IEEE-1284 specification Data transmission timing Refer to the IEEE-1284 specification
Product Description
Interfaces
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EPSON Stylus Scan 2500
Requests
Revision A
USB
Any items not included in this manual and/or the user's guide shall be in compliance with the Universal Serial Bus Specification Revision 1.0 Configuration - the scanner supports the following configurations
The scanner must support almost all standard device requests. The scanner does not support vendor specific requests.
Table 1-8. Scanner Configuration for USB
Element Description Full Speed Mode (12Mbit/s) Class: Vendor-specific Subclass: Vendor-specific Protocol: Vendor-specific Vendor ID: 0x04B8 (Seiko Epson Corp.) Product ID: 0x0106 Number of possible configurations: 1 Number of interfaces supported by this configuration: 1 Characteristics: Self-powered (Remote wake-up feature not supported) Max. power consumption from VBUS: 2mA (5V) No alternate setting Number of endpoints used by this interface (excluding endpoint 0):2 Class: Vendor specific Subclass: Vendor specific Protocol: Vendor specific Bulk IN transfer Max. data transfer size: 64 bytes Bulk OUT transfer Max. data transfer size: 64 bytes Language ID: English, US 1: iManufacturer "EPSON" 2: iProduct "Scanner Stylus Scan 2500"
Device
Configuration
Interface
Endpoint
String Descriptor
Product Description
Interfaces
22
EPSON Stylus Scan 2500
Revision A
1.6 Control Panel
Load/ Eject Printout Size button Darker/ Lighter Quality button Copies Copy button Stop/Clear button
LCD Panel
Hold for menu
Return
Item
Cleaner
Scan button
Reduce/ Enlarge
B&W/Color button
Error indicator
Operate indicator
Figure 1-8. Control Panel
S
1.6.1 Buttons
Table 1-9. Button functions
Button Load/Eject (pushed within two* seconds) Load/Eject (pushed for two* seconds) Function · Loads or ejects paper · If the carriage is at the ink cartridge installation position, returns the carriage back to the home position. · Starts the ink cartridge replacement sequence (not available during printing. Shifts the carriage to the ink cartridge replacement position.
Table 1-10. Power-on functions
Button Load/Eject Load/Eject + Cleaning Function Prints a status sheet that includes firmware version, ink counter, and nozzle check patterns. Enters the special-settings mode (see table below), which remains active for three seconds. If neither the Load/Eject nor Cleaning button is pushed in that three seconds, normal initialization begins.
Table 1-11. Special settings mode
Button Load/Eject Cleaning (hold for ten seconds) Function Resets the real-time counter (power-off time) in EEPROM Resets the waste ink overflow counter
· Starts the printhead cleaning cycle. Cleaning · If the printer is in the "Ink Low" or "Ink Out" or "No Ink (pushed for two* Cartridge" condition, starts the ink cartridge replacement seconds) sequence. Cleaning (pushed within two* seconds) · If the carriage is at the ink cartridge replacement position, returns the carriage from the ink cartridge replacement position to the home position.
* The user's guide states three seconds.
Product Description
Control Panel
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EPSON Stylus Scan 2500
3. Status Displays the current Stylus Scan condition. Before performing a local-copy operation, you should understand how the LCD and control panel buttons work. The LCD displays: Copy status Copy settings Stylus Scan error messages and maintenance status Miscellaneous settings not directly related to copying 1. Copy status While waiting for a copy job, the current copy settings are displayed. Example: (default) LCD 100% B&W Normal 1 4. Example: Scanner lamp is warming up Warm up Miscellaneous settings Allows users to print or change the following Demo pattern Status sheet Bottom margin Paper size category (metric or US) Language code Set factory default Reduce/ Enlarge B&W/ Color Quality
Button
Revision A
COPY BUTTON
Table 1-12. Copy button functions
Function · Sets Local Copy Mode as the default; same as printer reset. · Stops the current copy job and ejects the paper during copying. · Clears number of copies setting (returns to "1") · Clears settings and returns settings to their default values. · Starts copying (default = B & W 100% Normal 1) Notes
Button s
Number of copies
Operate
Figure 1-9. LCD and Button Relationship
2. Copy settings Allows you to make the following copy settings. Quality Reduce/Enlarge Paper size Brightness Number of copies
Stop/Clear
Copy
B&W/Color · Selects Color copy or Black & white copy
Product Description
Control Panel
24
EPSON Stylus Scan 2500 Table 1-12. Copy button functions (cont.)
Button Function Sets copy quality · B&W Normal Fine · Color Normal Fine Photo Note: When Photo is selected, the LCD displays "Load Photo Paper". · B&W 1-20 · Color 1-20 Increments by "1", and increment speed increases if held for more than one second. · · · · Enlarge/ Reduce Selects reduce or enlarge Default = 100% First press = LED shows current status Multiple presses (within 5 sec.s) = moves up one setting each time Example First time = Enlarge/Reduce LED only (100%) activated (default) Second or more time = cycles through the following. 93% > 80% > 70% > 50% 200% > 141% > 120% Resets to 1 if Stop/ Clear button is pressed. Notes Button
Revision A
Table 1-13. Settings Menu
Function LCD Hold Quality + B&W buttons for three seconds Menu Mode After two seconds BottomMargin:14/3mm Cycles through the menus below: BottomMargin:14/3mm PaperSize: Metric/US Lang: Eng Ger Fr Ital Span Port Set Factory Default Status Sheet Print Lang: Eng Ger Fr Ital Span Port Press copy to change to next Lang: Eng Ger Fr Ital Span Port
Quality B&W/ Color
Change modes Copy<-> Settings Menu
Quality
Copies +/-
Change menu in Settings Menu mode
Multiple copies
Copy
Executes menu or selects item
Sets the size of the printed paper during Local Copy mode; Printout Size A size area = A4/B5/A6 Letter size area = Letter/Half Letter/5x8" Brightness Sets the brightness level from -2>0>+2 in increments of "1".
Product Description
Control Panel
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EPSON Stylus Scan 2500
Revision A Table 1-14. LCD display and LED indicators (cont.)
Status Scanner Printer Copy P Indicators Display message Operate Error Color Ink Low (displays alternately with regular message) Warm Up Warm Up Scanning [xxx] (xxx=I/F) Printing [xxx] (xxx=I/F) Following messages alternate: A message = (current copy settings) B message = Now Copying x/y (x=current document number, y = total number of copies) Power on (for two seconds and then changes to Copy Mode (default)) EEPROM Reset
1.6.2 Indicators and LCD Display
Table 1-14. LCD display and LED indicators
Status Scanner fatal error Printer fatal error Maintenance request (waste ink pads full) ADF paper jam Printer paper jam ADF cover open Printer paper out Black Ink end/ No ink cartridge Color Ink end/ No ink cartridge Ink cartridge change mode Maintenance cover open Black ink level low Scanner Printer Copy S P Indicators Display message Operate Error On On Scanner Error Printer Error
Color Ink level low Scanner lamp warming up Ink charging Scanning Printing
-
S P S P
Flashing Flashing Flashing Flashing
-
P S P S P
-
On On Flashing Flashing Flashing
Call Service ADF Jam Printer Jam ADF Cover Open Printer Paper Out
Copying
C
Flashing
-
P
-
Flashing
Black Ink Out Power on (all) On -
P
-
Flashing
Color Ink Out Initialize EEPROM and reset timer IC P -
P S
Flashing Flashing
-
Replace Cartridge Maint. Cover Open Black Ink Low (displays alternately with regular message)
This order of items in this table is from high to low priority. "-" = no change/does not matter
P
-
-
Product Description
Control Panel
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EPSON Stylus Scan 2500
Revision A
1.6.3 Initialization
PRINTER INITIALIZATION
There are three initialization methods. 1. Power-on (hardware) initialization The printer initializes when turned on or when it recognizes the cold-reset command (remote RS command). When the printer initializes, the following actions are performed. Initialize printer mechanism Clear input data buffer Clear print buffer Set default values 2. Operator initialization The printer initializes when turned on within ten seconds of being turned off, or when the printer recognizes the -INIT signal (negative pulse) from the parallel interface. When the printer initializes, the following actions are performed. Cap the printhead Eject paper Clear input data buffer Clear print buffer Set default values 3. Software initialization The ESC@ command also initializes the printer. When the printer initializes, the following actions are performed. Clear print buffer Set default values
CLEAR STOP Valid Operation Power on Panel Reset Initialize by command
Table 1-15. Initialization
Operat Stand ing by Valid Valid Valid Valid Controller process Scanner process Printer process Restart -
H/W H/W initialization initialization
Valid
Set the local Controller Panel copy setting to initialization initialization default S/W S/W Valid initialization initialization · Stop copying · Setting remains as is
-
Cancel
Eject paper
Copy button
· Setting mode: default Valid · Copy mode: Multi-copies volume 1
Product Description
Control Panel
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EPSON Stylus Scan 2500
Revision A
SCANNER INITIALIZATION
There are three initialization methods. 1. Hardware initialization The scanner initializes when turned on. When the scanner initializes, the following actions are performed. Initialize scanner mechanism Clear input/output data buffer Set default values 2. Operator initialization The scanner initializes when it recognizes the -INIT signal (negative pulse) from the parallel interface. When the scanner initializes, the following actions are performed. Clear input/output data buffer Set default values 3. Software initialization The ESC@ command also initializes the scanner. When the scanner initializes, the following actions are performed. Clear input/output data buffer Set default values
1.7 Settings Menu
Enter the settings menu mode by holding down the Quality and B&W/Color buttons. Settings are saved when the power is turned off.
Table 1-16. Settings Menu
Button Function LCD Hold Quality + B&W buttons for three seconds Menu Mode After two seconds BottomMargin:14/3mm Cycles through the menus below: BottomMargin:14/3mm PaperSize:Metric/US Lang:Eng Ger Fr Ital Span Port Set Factory Default Status Sheet Print Lang: Eng Ger Fr Ital Span Port Press copy to change to next Lang: Ger Fr Ital Span Port Eng
Quality B&W/ Color
Change modes Copy<-> Settings Menu
Copies +/-
Change menu in Settings Menu mode
Copy
Executes menu or selects item
Product Description
Settings Menu
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EPSON Stylus Scan 2500
Revision A
MENUS
1. 2. Bottom Margin Determines the default bottom margin of 14mm or 3mm. Paper Size category Determines which paper size category is enabled; metric or US Metric = A4/B5/A6 US = Letter/Half Letter/5x8" Language Determines which language is used to display LCD messages; English/German/French/Italian/Spanish/Portuguese Set Factory Default Determines parameters for factory default settings. Factory default settings: Copy mode = Refer to "Buttons" on pag e24 Settings Menu mode = 14mm bottom margin The Paper Size and Language parameters are saved as defaults when power is turned off. Status sheet Prints the following settings: Bottom margin Paper size category Language
1.8 Stylus Scan Errors
PRINTER-SPECIFIC ERRORS Table 1-17. Printer-SPECIFIC errors
Error Cause Solution
3.
Ink out
4.
When one or more ink cartridges are almost empty, the printer enters the Install a new ink low-ink state and continues printing. When the cartridge is completely empty, cartridge. the printer indicates an ink-out error and stops printing. If the printer fails to properly load paper, Load paper and press it indicates a paper-out error. the Load/Eject button. Press the Load/Eject If the printer fails to properly eject paper, button. If this does not clear the error, remove it indicates a paper jam. the paper by hand. If the printer detects that one of the ink cartridges is not installed, it indicates a no-ink-cartridge error. Install a new ink cartridge.
Paper out
Paper jam
5.
No ink cartridge
Call Service
Replace the waste ink pads and reset the When the total amount of waste ink waste ink counter with reaches the limit, the printer indicates a the adjustment maintenance request and stops printing. program. See Chapter 5 for details. A carriage control or CG access error has occurred. Turn off the Stylus Scan and turn it back on. If the error does not clear, service.
Fatal error
NOTE: Do not re-install used ink cartridges. Doing so confuses the ink-level detection function and may cause a serious problem in the printhead.
Product Description
Stylus Scan Errors
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EPSON Stylus Scan 2500
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SCANNER-SPECIFIC ERRORS Table 1-18. Scanner-SPECIFIC errors
Error Cause
· The lamp is broken. · Stylus Scan turned on before the transportation screw was removed. · System breakdown.
1.9 Options
Solution
Turn off the Stylus Scan and turn it back on. If the error does not clear, service. (Disposition) Turn off the lamp and stop operation. Set bit 7 of the status byte. After removing the document, turn the Stylus Scan off and back on, or send the ESC @ command. Parallel I/F init: active pulse (Disposition) Turn off the lamp and stop operation. Set bit 7 of the status byte.
The optional Auto Document Feeder and optional Transparency Unit designed for use with the GT-7000 scanner may also be used with the EPSON Stylus Scan 2500 under the following restrictions.
1.9.1 Local Copy
ADF
If a document is loaded in the ADF tray, the Stylus Scan loads and scans that document. If a document remains on the document glass, a copy is not produced normally. Even if multiple copies are selected, the Stylus Scan ignores this setting and produces only one copy per document sheet.
Fatal error
ADF paper jam
ADF fails to eject the document.
TPU
The TPU cannot be used in Local Copy mode. The Stylus Scan ignores the TPU in this mode.
Command error
Unidentified command detected. (Disposition) The scanner sent a NACK signal Send a correct command to and is waiting for the next clear the error. command. If an incorrect command or parameter is received, it is disregarded and the previous value is maintained. ADF cover open Maintenance cover open Close the cover. Close the cover.
1.9.2 Scanning
ADF
Same as the GT-7000.
ADF cover open Maintenance cover open
TPU
If the Stylus Scan receives transparency scanning commands, it will turn on the TPU lamp and scan the transparency after the warm-up period. The Stylus Scan ignores the ADF in this mode. After scanning, the TPU lamp remains on until the TPU is turned off or until the Stylus Scan receives reflective document scanning commands. If the Stylus Scan receives reflective document scanning commands, it will scan the document normally.
Product Description
Options
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EPSON Stylus Scan 2500
Revision A
1.10 Physical Characteristics
1.10.1 Dimensions
212 x 517 x 413mm (HWD) (not including, extended parts, rubber parts, and the ASF projection)
1.10.2 Weight
Approximately 12Kg
Product Description
Physical Characteristics
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EPSON Stylus Scan 2500
Revision A
Product Description
Physical Characteristics
32
CHAPTER
2
OPERATING PRINCIPLES
EPSON Stylus Scan 2500
Revision A
2.1 General
The main components of the EPSON Stylus Scan 2500 are the printer mechanism, scanner mechanism, and the following circuit boards Main: Power Supply: Panel: B102 Main Board B102 PSB/PSE Board B102 PNL Board
2.2 Printer Mechanism Operation
Like previous EPSON Ink Jet printers such as the Stylus Color 740, the printer mechanism of the EPSON Stylus Scan 2500 does not have an exclusive mechanism to switch from paper feeding to pumping and back. Instead, this control is done by the rotational direction of the paper feed/ pump motor and also depends on the position of the carriage. The printhead combines the black and CMY heads in one unit. The following indicate the nozzle configurations of these 3 models. Black Nozzles: CMY Nozzles: 144 nozzles (120 dpi x 3 rows in staggered) 48 nozzles/colors (120 dpi x 1 row)
Motor Types and Corresponding Functions
Motor CR Motor Type Stepping Function Used to drive the carriage. · Drives the ASF to feed paper into paper path · Drives paper feed rollers at variable speeds · Drives the CR Lock lever (as described on page 44) · Drives pump unit to absorb ink For details see page 38
PF Motor
Stepping
page 40
Figure 2-1 in the in the right column shows the outline of the printer mechanism.
Operating Principles
General
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EPSON Stylus Scan 2500
Revision A
PF motor pinion Intermittent gear PF Motor Flushing section Star wheel Disengage flag Black I/C sensor CMY I/C sensor Carriage unit Printhead (one unit) Timing belt Cap unit
Disengage flag
73.6 Gear/Precision Gear ASF sensor Detector wheel Loading shaft
2.2.1 Printing Mechanism
The basic principles of the printhead are the same as previous models; DropOn-Demand type MACH head method. You need to manually input the drive-voltage code (printed on top of the printhead) for the multi-layer piezo electric element. Input this value every time you replace the printhead, MAIN board, or printer mechanism. The main parts of the printhead and carriage are described below. PZT PZT is an abbreviation of Piezo Electric Element. The print signal is sent from the MAIN board to the PZT via the driver circuit on the printhead unit. Then, the appropriate PZT squeezes the cavity, forcing the ink stored in the cavity out through the nozzle. This process is described in more detail on the next page. Ink cavity Ink flows from the ink cartridge, through the filter, and to the ink cavity where it is stored until one of the PZT units forces it out through the nozzles. Nozzle Plate The bottom surface of the printhead which contains nozzle holes to direct ejected ink toward the paper below. See the next page. Filter When the ink cartridge is installed, if any dirt or dust around the cartridge needles is absorbed into the inside of the printhead, there is a large possibility that the nozzles will clog. Clogged nozzles can be detected by alignment failure and dot-missing problems. To prevent these kinds of problems, a filter is set below the cartridge needle and ink flows through the filter on its way to the ink cavity.
Loading rollers
PE sensor Carriage HP sensor flag
Pump unit
Carriage HP sensor
CR guide shaft PF roller PG lever CR Motor
Figure 2-1. Printer Mechanism Block Diagram
Operating Principles
Printer Mechanism Operation
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EPSON Stylus Scan 2500
Revision A
Nozzle selector Board
Ink Out sensor actuators Needle Ink cartridge
PZT (Piezo) unit
Filter
Nozzle plate
Ink cavity
Figure 2-2. Printhead Sectional Drawing
Ink Out sensor actuators (x2) The Ink Out sensors (x2) detects whether or not an ink cartridge is installed according to the position of the Ink Out sensor actuator. When a cartridge is installed, the actuator is pushed down, which turns the shaft that is connected to the actuator. The flag at the other end of the shaft activates the Ink Out sensor when the cartridge is fully in place. See the next page for more details on the nozzle selector board and the ink ejecting process.
Operating Principles
Printer Mechanism Operation
36
EPSON Stylus Scan 2500
Revision A
2. Ejecting State: When a print signal is sent from the MAIN board, the IC (Nozzle Selector) located on the printhead unit receives the data in 1-byte units. The Nozzle Selector then sends the voltage signal on to the appropriate PZT. Due to the physical properties of the PZT, electrical signals cause the PZT to change shape. When the PZT changes shape, it squeezes the ink cavity, ejecting ink out through the nozzles.
2.2.2 Printing Process
The following figures show sectional drawings of the printhead in the normal and ejecting states. 1. Normal State: When no print signal is output, the PZT is in the normal, standby, state. Piezo unit Cavity
Ink course
Nozzles
Nozzle plate surface
Figure 2-4. Printhead Ejecting State
Figure 2-3. Printhead Normal State
Operating Principles
Printer Mechanism Operation
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EPSON Stylus Scan 2500
Revision A
2.2.3 Carriage Mechanism and Motor
The carriage mechanism moves the carriage back and forth according to the drive from the carriage motor. See Figure 2-6 on the next page. The carriage motor is a 4-phase, 200-pole, stepping motor and is driven by 2-2 phase, 1-2 phase, Double 1-2 phase, 2-Double 1-2 phase, and 4Double 1-2 phase drives. This stepping motor allows the carriage to move freely to fixed positions where necessary operations such as ink absorption can be performed. The following tables show carriage the motor specifications and motor controls.
Printing mode High Speed Skip Normal Printing Capping Wiping
CR Motor Control for Each Mode
Drive Speed [CPS] 340 200 80 40 20 5 Drive frequency [PPS] 4080 2400 960 480 240 60 Drive method Double1-2, 2-2,1-2 phase drive* Double 1-2, 2-2 phase drive 2-Double 1-2, 2-2 phase drive 2-Double 1-2, 2-2 phase drive 4-Double 1-2, 2-2 phase drive 4-Double 1-2, 2-2 phase drive
Carriage Motor Specifications
Items Motor type Drive voltage Range Internal coil resistance Control method Phase drive 42VDC ± 5% 7.8 Ohms ± 10%(per phase in 25 °C environment) Bi-Polar Drive 2-2, 1-2, 2-Double 1-2, and 4-Double 1-2 Description 4-Phase/200-pole Stepping motor
Cap (Valve Release) Withdrawal of cap
1
A
Phase drive
Phase Drive 2-2 1-2 Double 1-2 2-Double 1-2 4-Double 1-2 inch/pulse 1/120 1/240 1/480 1/960 1/1920 mm/pulse 0.212 0.106 0.053 0.026 0.013
2 Rotor 3
/A
B 4 /B
Figure 2-5. CR Motor Internal Circuit Diagram
Operating Principles
Printer Mechanism Operation
38
EPSON Stylus Scan 2500
Revision A
PLATEN GAP LEVER
Paper feed roller
Timing belt
Home position sensor Carriage unit
Carriage motor
Paper eject rollers
Paper guide (front)
Forward (normal) position
Rear (thick paper) position
Platen Gap lever
Parallelism adjust lever
Figure 2-6. Carriage Mechanism with platen gap lever (Top view)
As shown in Figure 2-6, the Platen Gap lever can be moved forward or back to adjust for the thickness of the paper. The PG lever is connected to the carriage guide shaft, which raises or lowers the carriage depending on the PG lever position. The nozzle surface remains parallel to the paper in either position thanks to a tilt adjustment mechanism. Also, the two parallelism-adjustment levers, one mounted on each side of the carriage guide shaft, adjust the parallelism between the platen and shaft when the shaft is installed in the factory. This precise adjustment is necessary to make sure the gap between the platen surface and the printhead surface is 1.04 mm in the normal position or 1.74 mm in the thick-paper position.
Operating Principles
Printer Mechanism Operation
39
EPSON Stylus Scan 2500
Revision A
2.2.4 Paper Feeding Mechanism
The paper feeding process begins at the ASF, continues through the 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 necessary for printhead cleaning. By using this pulse 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. 1 A
2 Rotor 3
/A
B 4 /B
Figure 2-7. PF Motor Internal Circuit Diagram
Motor Control for Each Mode
Printing mode High Speed Skip Normal Printing Capping Wiping Cap (Valve Release) Drive Speed [CPS] 340 200 80 40 20 5 Drive frequency [PPS] 4080 2400 960 480 240 60 Drive method Double 1-2, 2-2,1-2 phase drive* Double 1-2, 2-2 phase drive 2-Double 1-2, 2-2 phase drive 2-Double1-2, 2-2 phase drive 4-Double1-2, 2-2 phase drive 4-Double 1-2, 2-2 phase drive
PF Motor Specifications
Item Motor type Drive voltage Coil Resistance Control method Phase drive 42VDC ± 5% 7.8 Ohms ± 10%(per 1 phase under 25°C environment) Bi-Polar Drive 1-2, 2-2, Double 1-2, 2-Double 1-2 Description 4-phase/200-pole Stepping motor
Phase drive
Phase Drive 2-2 1-2 Double 1-2 2-Double 1-2 Inch/pulse 1/720 1/1440 1/2880 1/5760 mm/pulse 0.035 0.018 0.0088 0.0044
Withdrawal of cap
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
Operating Principles
Printer Mechanism Operation
40
EPSON Stylus Scan 2500
To the eject rollers: PF motor pinion gear (CCW rotation) Gear 73.6 Combination gear (13.5, 308) Spur gear (28) Paper eject rollers
NOTE: Above CCW rotation is mentioned viewing from the PF motor pinion gear side.
Revision A
Figure 2-8 shows a paper feeding mechanism block diagram, which includes the parts along the PF motor drive-transmission paths.
Gear 73.6
PF Roller
Paper Eject Roller PF motor Combination Gear13.5,30.8 Gear 28
Star Wheel Assy.
Figure 2-8. Paper Feeding Mechanism (Top View)
The printer feeds paper from the ASF (when the PE sensor located near the carriage motor detects paper is loaded) through the paper path and stops feeding when the paper's leading edge reaches the halfway point of the front paper guide. To correct for any misfeeding, the paper is fed back toward the ASF a predetermined number of steps and then it is fed forward again until it reaches the top-of-form position. Once the printer starts printing, it advances paper using the PF rollers and subrollers until it reaches the last 14mm of the paper, when it advances the paper using the star wheel gear and paper eject rollers. Torque sent from the ASF/Pump motor to the ASF unit via the disengage mechanism is used for the following operation.
Operating Principles
Printer Mechanism Operation
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EPSON Stylus Scan 2500
3.
Revision A
Due to the design of the ASF, the LD roller loses friction on the paper and stops at the point where the paper is fed by the PF roller. (See "PF Roller Paper Feed State" in Figure 2-9.) When the next print signal is sent or the Load/Eject button is again pressed, the PF motor rotates clockwise a specified number of steps to set the LD roller and the paper return lever in place. (See "Standby State" in Figure 2-9.)
MULTI-FEED PREVENTION MECHANISM
Like the Stylus COLOR 740 ASF, the ASF built in the Stylus Scan has the multiple-paper-feeding-prevention mechanism to provide accurate and consistent paper feeding. This mechanism prevents a sheet of paper from falling from the paper set position into the paper path. A paper return lever in the mechanism pushes paper that may have fallen off back onto the hopper. After this motion is completed, the LD roller starts loading paper. The multiple-paper-feeding-prevention operation is described in the following steps. 1. When the printer power is turned on, the ASF/Pump motor rotates counterclockwise to detect ASF home position. Then the motor rotates clockwise specified steps to set the LD roller and paper return lever to their proper positions. (See "Standby State" in Figure 2-9.) When the paper loading signal is sent from the PC or the Load/Eject button is pressed, the PF motor turns counterclockwise to let the LD roller load paper. (See "Paper Pick Up State" in Figure 2-9.)
4.
NOTE: If no print signal is sent for a predetermined number of seconds in step 4, the LD roller and the paper return lever automatically return to the standby state.
2.
Figure 2-9. Multiple Paper Loading Prevention Mechanism (right side view)
Operating Principles
Printer Mechanism Operation
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EPSON Stylus Scan 2500
Revision A
SMALLER TRAILING-EDGE MARGIN
Like the Stylus COLOR 740, this model uses a new design to allow printing up to the last 3mm by changing the design and position of the star-wheel gear. The star-wheel gear assembly has been shifted 5 degrees from directly on top of the eject rollers towards the front paper guide. This change suppresses the tailing edge of the paper so that the old minimum margin of 14mm has been reduced to only 3mm.
Old Feeding Method
Paper Star wheel Assembly
Printhead
Support roller
PF roller Eject rollers Platen 3mm bottom margin may contact printhead
New Feeding Method (from COLOR 740)
Moved to a 5 degree angle
This area remains stable
Figure 2-10. 3mm improved margin (viewed from right side)
Operating Principles
Printer Mechanism Operation
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EPSON Stylus Scan 2500
Revision A
The PF motor drive is sent to the CR Lock lever via the Paper Eject roller. PF Motor pinion gear (CW rotation) Gear 73.6 Combination gear
Gear 28 Paper Eject Roller CR Lock Lever
CARRIAGE LOCK MECHANISM
The carriage lock mechanism prevents the carriage from being left at an uncapped position for a long time which can occur due to user mistakes, physical shock, vibration during transport, and so on. The CR lock mechanism is driven by the stepping PF motor. See Table, " PF Motor Specifications," on page 40 for motor specifications. The PF motor controls the CR lock mechanism as well as the PF mechanism depending on the direction of the PF motor rotation. The CR lock mechanism is located at the right end of the paper eject roller.
If the carriage is left uncapped for a long time, ink on the printhead surface gradually thickens and may clog the nozzles. In some cases, the nozzles may be so thoroughly clogged that they cannot be cleared even after performing multiple cleaning operations. To prevent clogged nozzles, the printer caps and locks the carriage in the following conditions. Power off sequence: When power is turned off, even during printing, the printer caps and locks the carriage at the end of the power-off sequence. Power on sequence: When power is turned on, the printer automatically performs an automatic (power-on) cleaning cycle and then caps and locks the carriage.
Top view Bushing 6
Pump Planetary Lever
Right-side view Carriage
CR Lock Lever Paper Eject roller Middle frame Pump Planetary Lever Guide
NOTE: The power-on cleaning cycle is an automatic head cleaning sequence that is performed every time the power is turned on. The timer IC, which is powered by the lithium battery, measures the length of time the printer has been off. The printer selects and performs the appropriate cleaning operation according to the length of time it has been off. Paper eject sequence: When the Load/Eject button is pressed, the printer ejects any paper in the paper path. If no print data is received at this time, the printer caps and locks the carriage and then enters the standby mode. However, if no paper is in the paper path when the Load/Eject is pressed, the printer loads a sheet and does not lock the carriage.
Figure 2-11. CR Lock Mechanism
While the PF motor drive is used for paper feeding (PF motor rotation = CCW), the CR Lock Lever is set under the Paper Eject Frame. But the CR Lock lever rises up and locks the carriage when the PF motor rotates CW.
Operating Principles
Printer Mechanism Operation
V V V
PF motor torque is always transmitted to the CR lock lever side, but the operation of the CR lock mechanism varies depending on the rotation direction of the motor. Clockwise = sets the carriage lock lever Counterclockwise= releases the carriage lock lever
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EPSON Stylus Scan 2500
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PAPER PICK-UP OPERATION
When the Load/Eject switch is pressed or printing order is input, the carriage unit moves until the left edge and collides with paper pick up trigger lever. When the carriage collides with this trigger level, a planetary gear located on the same axis is also pushed at the same time and conveys the motive power on the platen to the adjoining gear line side for ASF drive.
Gear 34/ ASF roller drive gear
Combination gear 16,40.8
Paper pickup trigger lever
Gear 36/ Eject roller drive gear Combination G 12.4,28/ Eject roller transmission gear PF motor pinion gear
Spur 23.2/ASF roller transmission gear
Gear 73.6
Combination G 16,21.6/Platen