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SERVICE MANUAL
All-in-one printer, scanner, and copier
EPSON STYLUS Scan 2000
®
SEIJ99006
EPSON STYLUS Scan 2000
Revision B
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.
2
EPSON STYLUS Scan 2000
Revision A
PRECAUTIONS
Precautionary notations throughout the text are categorized relative to 1) Personal injury and 2) damage to equipment.
W A R N IN G
Signals a precaution which, if ignored, could result in damage to equipment.
C A U T IO N
Signals a precaution which, if ignored, could result in damage to equipment.
DANGER
1. ALWAYS DISCONNECT THE PRODUCT FROM THE POWER SOURCE AND PERIPHERAL DEVICES PERFORMING ANY MAINTENANCE OR REPAIR PROCEDURES. 2. NOWORK SHOULD BE PERFORMED ON THE UNIT BY PERSONS UNFAMILIAR WITH BASIC SAFETY MEASURES AS DICTATED FOR ALL ELECTRONICS TECHNICIANS IN THEIR LINE OF WORK. 3. WHEN PERFORMING TESTING AS DICTATED WITHIN THIS MANUAL, DO NOT CONNECT THE UNIT TO A POWER SOURCE UNTIL INSTRUCTED TO DO SO. WHEN THE POWER SUPPLY CABLE MUST BE CONNECTED, USE EXTREME CAUTION IN WORKING ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS.
WARNING
1. REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON CERTIFIED REPAIR TECHNICIAN. 2. MAKE CERTAIN THAT THE SOURCE VOLTAGES 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 AVAILABLE POWER SOURCE, DO NOT CONNECT IT TO THE POWER SOURCE. 3. ALWAYS VERIFY THAT THE EPSON PRODUCT HAS BEEN DISCONNECTED FROM THE POWER SOURCE BEFORE REMOVING OR REPLACING PRINTED CIRCUIT BOARDS AND/OR INDIVIDUAL CHIPS. 4. IN ORDER TO PROTECT SENSITIVE MICROPROCESSORS AND CIRCUITRY, USE STATIC DISCHARGE EQUIPMENT, SUCH AS ANTI-STATIC WRIST STRAPS, WHEN ACCESSING INTERNAL COMPONENTS. 5. REPLACE MALFUNCTIONING COMPONENTS ONLY WITH THOSE MADE BY THE MANUFACTURER; INTRODUCTION OF SECOND-SOURCE ICs OR OTHER NONAPPROVED COMPONENTS MAY DAMAGE THE PRODUCT AND VOID ANY APPLICABLE EPSON WARRANTY.
3
EPSON STYLUS Scan 2000
Revision A
PREFACE
This manual describes basic functions, theory of electrical and mechanical operations, maintenance and repair procedures of EPSON STYLUS Scan 2000. The instructions and procedures included herein are intended for the experienced repair technicians, and attention should be given to the precautions on the preceding page. The chapters are organized as follows:
CHAPTER 1. CHAPTER 2. CHAPTER 3. CHAPTER 4.
"Product Description" "Operating Principles" "Troubleshooting" "Disassembly & Assembly"
Provides a general overview and specifications of the product.
Describes the theory of electrical and mechanical operations of the product.
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 Epson-approved 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
4
EPSON STYLUS Scan 2000
Revision A
Revision Status
Revision Revision A Revision B Issued Date October 4, 1999 October 20, 1999 Description Full version Changed Disassembly and Troubleshooting to account for ASP blue protective tape, also fixed scanner removal description
5
EPSON Stylus Scan 2000
Revision A
Contents
Product Description
Features ......................................................................................................... 9 General Specifications ............................................................................... 10 Local copy .............................................................................................. 10 Scan area................................................................................................ 10 Print area ................................................................................................ 11 Printer ..................................................................................................... 12 Scanner .................................................................................................. 15 Common................................................................................................. 16 Interfaces ..................................................................................................... 17 Printer interface ..................................................................................... 17 Scanner interfaces................................................................................. 22 Control Panel............................................................................................... 23 Buttons ................................................................................................... 23 Control panel indicates the printer's condition................................... 25 Initialization............................................................................................ 26 Stylus Scan Errors ...................................................................................... 28 Physical Characteristics.............................................................................. 29 Dimensions ............................................................................................ 29 Weight .................................................................................................... 29 External view ......................................................................................... 29
Operating Principles
General ........................................................................................................ 31 Printer Mechanism Operation ................................................................... 32 Printing Mechanism .............................................................................. 33 Printing Process..................................................................................... 34 Carriage Mechanism ............................................................................. 35 Paper Feeding Mechanism ................................................................... 37 Ink System ............................................................................................. 42 Pump, Carriage Lock, Head Cleaner Mechanism................................ 43 Scanner Mechanism Operation................................................................. 46 Mechanism ............................................................................................ 46 Local and PC-Centric Copy Principles ....................................................... 47 Local copy process ................................................................................ 47 PC-Centric copy process ....................................................................... 47 Electrical Circuit Operating Principles ...................................................... 49 B101 PSB/PSE Board ............................................................................. 50 B101 MAIN Board.................................................................................. 53
Troubleshooting
Unit Level Troubleshooting ....................................................................... 57 Printer/Scanner does not operate at power on................................... 58 Error is detected .................................................................................... 59 Failure occurs during printing .............................................................. 59 Printer does not feed paper correctly .................................................. 60 Control panel operation is abnormal................................................... 60 Repair of the Printer Mechanism .............................................................. 61 Troubleshooting the Scanner .................................................................... 65 Scanner Troubleshooting Flowcharts.................................................. 65 Scanner troubleshooting check points ................................................ 66 Troubleshooting the Motors and Sensors ............................................... 69
6
EPSON Stylus Scan 2000
Revision A
Disassembly & Assembly
Overview ..................................................................................................... 71 Precautions for Disassembling the Printer.......................................... 71 Tools ....................................................................................................... 72 Screw Numbering System and Specifications ................................... 73 Service Checks After Repair ................................................................. 74 Disassembly Procedures............................................................................ 76 Removing the Housing ......................................................................... 77 Removal of printer consumables ......................................................... 81 Removing the Circuit Board Tray......................................................... 84 Removing the Scanner Mechanism..................................................... 88 Disassembling the Printer Mechanism................................................ 94
Maintenance
Printer-Related Maintenance ................................................................... 127 Cleaning .................................................................................................... 128 Exterior ................................................................................................. 128 Inside .................................................................................................... 128 Lubrication ................................................................................................ 129 Printer Mechanism .............................................................................. 129
Appendix
Connector Summary ................................................................................ 138 Board Connector Summary................................................................ 139 Connector Pin Assignment ................................................................. 140 EEPROM Address Map............................................................................. 143 Exploded Diagrams .................................................................................. 148 Parts List .................................................................................................... 155 Component Layout ................................................................................... 160 Circuit Diagrams ....................................................................................... 165
Adjustment
Required Adjustments.............................................................................. 108 Adjustment Tools Required................................................................ 110 Printer Adjustment ................................................................................... 110 Printer hardware adjustments............................................................ 111 Using the Service-Adjustment Program................................................. 113 Installing the program......................................................................... 113 Opening the Start-up menu................................................................ 114 Initial Ink Charge Operation................................................................ 119 Bi-D Adjustment .................................................................................. 120 Head Cleaning Operation.................................................................... 121 Head Voltage ID Input ......................................................................... 122 Head Angular Adjustment .................................................................. 123 Ink draining .......................................................................................... 125 Scanner Adjustment................................................................................. 125
7
CHAPTER
1
PRODUCT DESCRIPTION
EPSON Stylus Scan 2000
Revision A
Two Built-in Interfaces Bi-directional parallel I/F (IEEE-1284 level 1 device)
1.1 Features
The major features of the EPSON Stylus Scan 2000 are: High Color Print Quality 1440 (H) X 720 (V) dpi printing Four Color Printing (CMYK) Traditional and New Microweave Sheet-fed 300dpi scanning High quality local copy One color copy mode Two B&W copy modes High speed local copy Color normal mode copy Gray mode copy B/W normal mode copy Max. 1.2 PPM Max. 1.3 PPM Max. 3.0 PPM Text & Graphics Black & White, Grayscale
USB Windows/Macintosh exclusive Copy settings from the computer Auto Photo Fine Auto Enlarge Auto Layout Background reduction Installed functions are the same or equivalent to the EPSON Stylus Color 740 and the GT-2200. Small footprint 228 x 437 x 279 mm (HWD)
Local copy settings from the control panel Enlargement Reduction Copy size protection 141% 93%, 70% Letter/Half Letter/5 x 8"/Legal A4/B5/A6
(Copy size protection prevents the printhead from firing ink onto the platen in cases where the loaded paper size does not match the paper size selected in the software.) Built-in Auto Sheet Feeder Holds 100 cut-sheets (64g/m2) Holds 10 envelopes Holds 30 transparency films
Product Description
Features
9
EPSON Stylus Scan 2000
Revision A
1.2 General Specifications
1.2.1 Local copy
1. Local copy
1.2.2 Scan area
PW RM LM Starting scan position (1st bit) Document edge (scale edge)
Table 1-1. Local Copy Specifications
Mode B/W Color B/W Grayscale Text & Graphics Scan res. Output mode Print res. Micro Variable Head Weave dot seq. Off On On No No No Media
Scanning Area
TM
300x300 Line art 360x360 300x300 300x300 Gray Full color 360x360 360x360
Bi-D Normal Bi-D Normal Bi-D Normal
Output mode = data from the scanner ASIC to the printer
PL
2.
Enlargement:
Default Enlargement Reduction (not continuous) Max. copy size
100% 141% 70%, 93% 216 x 355.6mm (8.5 x 14inches) (Top, bottom, and both sides need 3mm margins) A4/B5/A6 (A-size version) Letter/Half Letter/5 x 8"/Legal (Letter size version) A4/Letter A4/Letter
3.
Copy size
Copy size protection
BM
4.
Printing paper size Normal paper Photo paper
Figure 1-1. Scan Area Table 1-2. Scan Area
Document PW PL size (width) (length) A4 Letter 210mm 216mm 297mm 355.6m m 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
Product Description
General Specifications
10
EPSON Stylus Scan 2000
Revision A
1.2.3 Print area
LM PW Paper feed direction RM
Size A4 PW 210mm PL 297mm 279mm 257mm 356mm
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
Letter 216mm
Printable Area
TM
B5
182mm
Legal 216mm
PL
BM
Figure 1-2. Print Area
Product Description
General Specifications
11
EPSON Stylus Scan 2000
Revision A
1.2.4 Printer
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
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 inch cut-sheet ASF (front enter, front out) normal/ continuous fast/continuous
2.36 inch/sec. 4.5 inch/sec.
Print speed & printable columns
Table 1-4. Character mode
Character pitch 10 CPI (Pica) Printable columns 80 LQ speed 200 cps
Table 1-5. Raster graphic 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
CONTROL CODES
ESC/P Raster EPSON Remote Command
Product Description
General Specifications
12
EPSON Stylus Scan 2000
Revision A
PAPER
Cut-sheets size: 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
TM
thickness: weight: quality:
Printable Area
BM
OHP sheets, Glossy paper size: thickness: 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")
Figure 1-3. Printable Area for Envelopes Table 1-6. Envelope Margin
NOTE: Transparency printing is only supported at normal temperature.
Size
Envelopes size: 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") 45g/m2~75g/m2 (12~20lb.) Exclusive paper, bond paper, Air mail
#10 DL C6
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")
thickness: weight: quality:
NOTE: Envelope printing is only supported at normal temperature. Load long edge first. Index cards size: 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")
thickness:
Product Description
General Specifications
13
EPSON Stylus Scan 2000
2. Ink cartridge (color) Exclusive cartridge Magenta, cyan, and yellow
Revision A
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°C) 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:
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°C) 42.9 (W) x 52.7 (D) x 38.5mm (H)
Dimensions:
Dimensions:
52.7
42.9
52.7
38.5
38.5
Figure 1-5. Color 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.
Figure 1-4. Black Ink Cartridge
Product Description
General Specifications
14
EPSON Stylus Scan 2000
Revision A
INPUT DATA BUFFER
64K bytes
1.2.5 Scanner
Product type Sub scan method Photoelectric device Max. scan area Max. effective pixels Scan resolution Output resolution Sheet-fed color image scanner (without ADF) Sheet-fed type Color CCD line sensor 8.5 x 14" (216 x 355.6mm) 2550 x 4220 pixels (300dpi) main = 300dpi and sub = 300dpi 50~4800 dpi (1dpi increments)
Scan speed (300dpi, Draft mode) Color = 4.25 msec/line Monochrome (bi-level) = 1.68 msec/line Color separation Command level Zoom Pixel depth Gamma correction By the CCD color filter ESC/I - B7 50~200% (1% increments) 8 bits/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 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
Color correction
Brightness Line art Digital halftoning (Bi-level, Quad-level) Interface Light source
Product Description
General Specifications
15
EPSON Stylus Scan 2000
Revision A
1.2.6 Common
ELECTRICAL SPECIFICATIONS
Rated voltage Input voltage Rated current Rated frequency range Input frequency range Power consumption Insulation resistance AC 120V AC 220~240V AC 99~132V AC 198~264V 0.6A (AC 120V model) 0.4A (AC 220-240V model) 50~60 Hz 49.5~60.5 Hz Approx. 29W (local copy printing) 10M at 500V DC (between AC line and chassis)
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)
90 80 70 60 50 40 30 20 10
Humidity
Humidity (%)
SAFETY, EMC
Safety UL1950 (UL) CSA C22.2 No. 950 (CSA) EN60950 (VDE) FCC Part15 Subpart B Class B CSA C108.8 Class B AS/NZS3548 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 Resistance to shock
10
20
27 30
35
40
EMC
Temperature (°C)
Figure 1-6. Environment
1 G, within one ms (operating) 2 G, within two ms (non-operating, in packaging)
CE Marking
Resistance to vibration0.15G (operating) 0.50G (non-operating, in packaging)
RELIABILITY
Main unit Lamp Life 75,000 pages Life 15,000 hours
Product Description
General Specifications
16
EPSON Stylus Scan 2000
Revision A
Packet Refer to the IEEE-P1284.4 Standard for Data Delivery and Logical Channels for IEEE Std. 1284 Interface (Draft D1.50) TTL compatible level (IEEE-1284 Level 1 device) Refer to the IEEE-1284 specification
1.3 Interfaces
This section is divided into printer and scanner interface specifications. See the following section for printer interface details or see "Scanner interfaces" on page 22 for scanner interface details.
Signal level Data trans. timing 2.
1.3.1 Printer interface
PARALLEL
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 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. Specifications 8 bit parallel, IEEE-1284 ECP compatibility/nibble mode Refer to the IEEE-1284 specification Refer to the IEEE-1284 specification
Connector pin assignment and signals
Table 1-7. Forward channel pin assignments and signals
Pin # Signal Name Return In/Out GND pin 19 20 21 22 23 24 25 26 27 28 29 28 28 30 In In In In In In In In In Out Out Out Out In A negative signal that indicates the printer is ready to accept data A high signal that indicates the printer is not ready and cannot receive data A high signal indicates a paper-out error Always at high level when the printer is on Not used The falling edge of a negative pulse or a low signal on this line causes the printer to initialize. Minimum 50us pulse necessary. The DATA0 through DATA7 signals represent data bits 0 to 7, respectively. Each signal is high when data is logical 1 and low when data is logical 0. Description The strobe pulse. Read-in data is preformed at the falling edge of this pulse.
1 2 3 4 5 6 7 8 9 10 11 12 13 14
-STROBE DATA0 DATA1 DATA2 DATA3 DATA4 DATA5 DATA6 DATA7 -ACKNLG BUSY PE SLCT -AFXT
Transmission mode Synchronization Handshaking
31
-INIT
30
In
Product Description
Interfaces
17
EPSON Stylus Scan 2000 Table 1-7. Forward channel pin assignments and signals
Pin # 32 36 18 35 17 Signal Name -ERROR -SLIN Logic H +5V Chassis GND Return In/Out GND pin 29 30 Out In Out Out Description A low signal indicates a printer error condition Not used Pulled up to +5V via 3.9K resistor Pulled up to +5V via 3.3K resistor Chassis GND Signal GND Not connected. 32 36 18 35 17 The DATA0 through DATA7 signals represent data bits 0 to 7, respectively. Each signal is high when data is logical 1 and low when data is logical 0. These signals are used to transfer the 1284 extensibility request values to the printer. 31 nReverseReque st nPeriphRequest 1284-Active Periph-Logic H +5V Chassis GND 30 29 30 In Out In Out Out 14 HostAck 30 In Pin # 13
Revision A Table 1-8. Reverse channel pin assignments and signals
Signal Name Xflag Return In/Out GND pin 28 Out Description X-flag signal and reverse channel transfer data bit 1 or 5 Host uses this signal for flow control in reverse direction. Also this signal offers the data bit 9 that is used to judge whether the data or command will be sent on the data signal in forward direction. This signal goes low to change to the reverse channel. This signal produces a host interrupt. 1284 active signal, High in ECP mode. Always high. Pulled up to +5V via 3.9K resistor Always high. Pulled up to +5V via 1.0K resistor Chassis GND Signal GND Not connected.
16, 33 GND 19-30 15,34 NC
Table 1-8. Reverse channel pin assignments and signals
Pin # 1 2 3 4 5 6 7 8 9 10 11 12 Signal Name HostClk DATA0 DATA1 DATA2 DATA3 DATA4 DATA5 DATA6 DATA7 PeriphClk PeriphAck nAckReverse Return In/Out GND pin 19 20 21 22 23 24 25 26 27 28 29 28 In In In In In In In In In Out Out Out Data transferred from product to host. Printer busy signal and reverse channel transfer data bit 3 or 7 Printer goes to Low and approves nReverseRequest Description Data or address information transferred from host to product.
16, 33 GND 19-30 15,34 NC
3.
Data trans. timing Refer to the IEEE-1284 specification and the following.
Product Description
Interfaces
18
EPSON Stylus Scan 2000
Revision A
Table 1-10. Typical tack time
DATA
data byte n data byte n +
Parallel I/F mode High speed Normal speed
Time required 1 us 3 us
thold -STROBE tsetup BUSY tready -ACKNLG treply tack tnbusy tbusy tstb tnext
* The Logic H signal goes low, 2.0 V or less, when the printer is turned off and goes high, 3.0 V or more, when the printer is turned on. The receiver shall provide an impedance equivalent to 7.5 K to ground.
4.
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
Figure 1-7. Data Transmission Timing Table 1-9. Data transmission times
Parameter tsetup thold tstb tready tbusy tt-out* tt-in** treply tack tnbusy tnext Minimum 500 ns 500 ns 500 ns 0 0 500 ns 0 0 Maximum 500 ns 120 ns 200 ns 10 us -
Device ID: The printer sends the following device ID string when it is requested. IEEE 1284.4 is enabled, [00H][5EH] MFG:EPSON; CMD:ESCPL2,BDC,D4,SPC; MDL:Stylus[SP]Scan[SP]2000; CLS:PRINTER DES:EPSON[SP]Stylus[SP]Scan[SP]2000; Note: (1)[00H] denotes a hexadecimal value of zero (2)MDL value depends on the EEPROM setting.
* Rise and fall time of every output signal ** Rise and fall time of every input signal
Product Description
Interfaces
19
EPSON Stylus Scan 2000
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-OUTS
Generally, hosts abandon data transfer to peripherals when a peripheral is in the busy state for dozens of seconds continuously. 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
Suggested cable length :2 meters
Table 1-11. USB connector pin assignments and signals
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 #2
Pin #1
Pin #3
Pin #4
Figure 1-8. USB Pins
Product Description
Interfaces
20
EPSON Stylus Scan 2000
Revision A
INTERFACE SELECTION
The Stylus Scan has two built-in interfaces; the USB and parallel interfaces. The interface in use is selected automatically. Automatic selection 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 effect on the parallel interface when the parallel interface is selected.
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 pointto-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.
Product Description
Interfaces
21
EPSON Stylus Scan 2000
Revision A
1.3.2 Scanner interfaces
PARALLEL
1. Specification 8 bit parallel, IEEE-1284 ECP (Compatibility/Nibble) mode Refer to the IEEE-1284 specification Refer to the IEEE-1284 specification Refer to the IEEE P1284.4 Standard for Data Delivery and Logical Channels for IEEE Std. 1284 Interface (Draft D1.50) Refer to the IEEE 1284.4 specification TTL compatible level (IEEE-1284 Level 1 device) Refer to the IEEE-1284 specification
Interface Configuration Device Element
Table 1-12. USB Configuration
Description Full Speed Mode (12Mbit/s) Class: Vendor-specific Subclass: Vendor-specific Protocol: Vendor-specific Vendor ID: 0x04B8 (Seiko Epson Corp.) Product ID: 0x0105 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 String Descriptor Language ID: English, US 1: iManufacturer "EPSON" 2: iProduct "Scanner Stylus Scan 2000"
Transmission mode Synchronization Handshaking Packet
Signal level Data trans. timing 2.
Connector pin assignments Refer to the IEEE-1284 specification
USB
Any items not included in this specification shall be in compliance with the Universal Serial Bus Specification Revision 1.0 Configuration - the scanner supports the following configurations
Endpoint
Requests The scanner must support almost all standard device requests. The scanner does not support vendor specific requests. Some requests and descriptors depend on the configuration (endpoint number) of each USB device. Therefore this specification recommends the configuration where Endpoint 1 is Bulk IN endpoint and Endpoint 2 is OUT endpoint.
Product Description
Interfaces
22
EPSON Stylus Scan 2000
Revision A
1.4 Control Panel
Paper Load/Eject Paper Error Black Ink Maintenance Color Ink Maintenance
141 93% 70%
1.4.1 Buttons
Table 1-13. Normal button functions
Operate LED
Button Load/Eject 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). The carriage moves to the black ink cartridge installation position first, and then to the color ink cartridge installation position when pushed a second time. · Starts the printhead cleaning cycle. · If the printer is in the "Ink Low" or "Ink Out" condition, starts the ink cartridge replacement sequence. · Returns the carriage from the ink cartridge replacement position to the home position.
Ink Maintenance Scanner Error LED
Color Bk Grayscale Bk Text
Power button
Load/Eject (pushed for two* seconds) Cleaning (pushed for two* seconds) Cleaning
Stop/Clear button Copy button
Enlarge/ Reduce LED
Enlarge/Reduce Selector
Copy Mode Selector
* The user's guides state three seconds.
Table 1-14. Power-on button 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.
Figure 1-9. Control Panel
Table 1-15. 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
Product Description
Control Panel
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EPSON Stylus Scan 2000
Revision A
COPY BUTTON Table 1-16. Copy button functions
Button Operate Stop/Clear Copy Function · Sets Local Copy Mode as the default. · Stops the current copy job and ejects the paper during copying. · Ejects paper during paper loading. · The default setting for copying is B & W and 100% · Selects Grayscale, Black Text, or Color (Text & Graphics) · First press = LED shows current status · Multiple presses (within 5 sec.s) = moves up one setting each time · Example First time = Black Text LED activated (default) Second time = Grayscale LED activated Third time = Color Text & Graph LED activated Fourth time = Black Text LED activated · · · · 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 time = Enlarge/Reduce and 70% LEDs activated Third time = Enlarge/Reduce and 93% LEDs activated Fourth time = Enlarge/Reduce and 141% LEDs activated Fifth time = Enlarge/Reduce LED only (100%) activated
Table 1-17. Power-on functions for the Copy button
Button Copy Stop/Clear Function Prints a status sheet including firmware version and paper size. Changes printout paper size during copying (see below).
To change the printout paper size during copying, press the Stop/Clear button until the appropriate indicator combination activates, as described below.
Table 1-18. Changing printout paper sizes during local copying
Paper size A4 Letter Control Panel Indicators Scanner Error on on Color on off Grayscale off off Black Text off on
Copy Mode
Product Description
Control Panel
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EPSON Stylus Scan 2000
Revision A
1.4.2 Control panel indicates the printer's condition
PRINTER Table 1-19. Printer Condition
Printer status Printing Ink charging Ink cartridge replacement mode Paper Out Paper jam No ink cartridge/ ink end black Ink low black No ink cartridge/ ink end color Ink low color Enter EEPROM and Timer IC reset Maintenance request Fatal error "-" = does not matter Indicators Power Flashing Flashing Flashing Flashing Flashing Flashing Ink Out (BK) Off On Flashing On Flashing On Ink Out (C) Off On Flashing Paper Out -
SCANNER Table 1-20. Scanner Condition
Scanner status Lamp warming up Fatal error Paper jam "-" = does not matter Indicators Power Flashing Error On On Priority 1 1 2
On Flashing Scanner status Power on Copying Power On Flashing -
LOCAL COPY Table 1-21. Copy Status
Indicators Error On Priority 3 2 1
On (one second only) On On On Flashing
Scanner/Printer error Paper jam "-" = does not matter
Product Description
Control Panel
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EPSON Stylus Scan 2000
Revision A
1.4.3 Initialization
PRINTER
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, 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 Operation Power on Panel Reset
Table 1-22. Initialization
Operat Standb ing y Valid Valid Valid Controller process Scanner process Printer process Restart Copy button
H/W H/W initialization initialization
Initialize by Valid command STOP Valid
Set the local Controller Panel Valid copy setting to initialization initialization default S/W S/W Valid initialization initialization Stop copying Setting remains as is Cancel Eject paper
· Setting mode: default Valid · Copy mode: Multi-copies volume 1
Product Description
Control Panel
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EPSON Stylus Scan 2000
Revision A
SCANNER
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
Product Description
Control Panel
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EPSON Stylus Scan 2000
Revision A
1.5 Stylus Scan Errors
PRINTER Table 1-23. Printer Related Errors
Error Cause Solution
When one or more ink cartridges are almost empty, the printer enters the lowink state and continues printing. Install a new ink 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 it indicates a paper jam. clear the error, remove 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.
SCANNER Table 1-24. Scanner Related Errors
Error Cause
· · · · The lamp is broken. System breakdown. Scanner fails to eject the document. (Disposition)
Solution
Turn off the Stylus Scan and turn it back on. If the error does not clear, service. Turn off the lamp and stop operation. Set bit 7 of the status byte.??
Fatal error
Ink out
Paper out
Command error
Paper jam
Unidentified command detected. (Disposition) The scanner sent a NACK signal and is waiting for the next command. If an incorrect command or parameter is received, it is disregarded and the previous value is maintained.
Send a correct command to clear the error.
No ink cartridge Maintenance request
When the total amount of waste ink Replace the waste ink reaches the limit, the printer indicates a pads. maintenance request and stops printing. Turn off the Stylus A carriage control or CG access error has Scan and turn it back on. If the error does not occurred. clear, service.
Fatal error
NOTE: Do not re-install used ink cartridges. Doing so confuses the inklevel detection function and may cause a serious problem in the printhead.
Product Description
Stylus Scan Errors
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EPSON Stylus Scan 2000
Revision A
1.6 Physical Characteristics
1.6.1 Dimensions
228 x 437 x 279 mm (HWD)
1.6.2 Weight
7.5 Kg
1.6.3 External view
Figure 1-10. EPSON Stylus Scan 2000
Product Description
Physical Characteristics
29
CHAPTER
2
OPERATING PRINCIPLES
EPSON Stylus Scan 2000
Revision A
2.1 General
The main components of the EPSON Stylus Scan 2000 are the printer mechanism, scanner mechanism, and the following electronic boards; Main: Power Supply: Panel: B101 Main Board B101 PSB/PSE Board B101 PNL Board
Operating Principles
General
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EPSON Stylus Scan 2000
Revision A
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 2000 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)
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
page 37
Disengage lever
73.6 Gear/Precision Gear ASF sensor Detector wheel Loading shaft
Table 2-1. 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 40) · Drives pump unit to absorb ink For details see page 35
Loading rollers
PE sensor Carriage HP sensor flag
PF Motor
Stepping
Pump unit
Carriage HP sensor
Figure 2-1 in the in the right column shows the outline of the printer mechanism.
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 2000
Revision A
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 PSB/PSE board through the driver board on the printhead unit and to the PZT. 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. PZT (Piezo) unit I/C Out sensor actuator
Nozzle selector Board
Needle Ink cartridge
Filter
Nozzle plate
Ink cavity
Figure 2-2. Printhead Sectional Drawing
I/C Out sensor actuator The I/C Out sensor detects whether or not an ink cartridge is installed according to the position of the I/C 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 I/C 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
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EPSON Stylus Scan 2000
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. Ink course Piezo unit Cavity
Nozzles
Nozzle plate surface
Figure 2-4. Printhead Ejecting State
Figure 2-3. Printhead Normal State
Operating Principles
Printer Mechanism Operation
34
EPSON Stylus Scan 2000
Revision A
2.2.3 Carriage Mechanism
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 4-Double 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.
Table 2-4. CR Motor Control at Each Mode
Printing mode High Speed Skip Normal Printing Capping Wiping Cap (Valve Release) Withdrawal of cap 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
Table 2-2. Carriage Motor Specifications
Items Motor type Drive voltage Range Internal coil resistance Control method Description 4-Phase/200-pole Stepping motor 42VDC ± 5% 7.8 Ohms ± 10%(per phase under 25 °C environment) Bi-Polar Drive
1
A
Table 2-3. 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
35
EPSON Stylus Scan 2000
Revision A
PLATEN GAP LEVER
Home position sensor Carriage unit Carriage motor
Paper feed roller
Timing belt
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
36
EPSON Stylus Scan 2000
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 2000, 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.
Phase Drive 2-2 1-2 Double 1-2 2-Double 1-2
Table 2-6. Phase drive
Inch/pulse 1/720 1/1440 1/2880 1/5760 mm/pulse 0.035 0.018 0.0088 0.0044
1
A
2 Rotor 3
/A
Table 2-5. PF Motor Specifications
Item Motor type Drive voltage Coil Resistance Control method Phase drive Description 4-phase/200-pole Stepping motor 42VDC ± 5% 8.8 Ohm ± 10%(per 1 phase under 25°C environment) Bi-Polar Drive 1-2, 2-2, Double 1-2, 2-Double 1-2
B 4 /B
Figure 2-7. PF Motor Internal Circuit Diagram
Operating Principles
Printer Mechanism Operation
37
EPSON Stylus Scan 2000 Table 2-7. Print Modes and Drive Methods
Printing mode High Speed Skip Normal Printing Capping Wiping Cap (Valve Release) Withdrawal of cap 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 Combination Gear13.5,30.8 Gear 28 Paper Eject Roller
Revision A
Gear 73.6
PF Roller
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.
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 To the eject rollers: PF motor pinion gear (CCW rotation) Gear 73.6 Combination gear (13.5, 30.8) Spur gear (28) Paper eject rollers
NOTE: Above CCW rotation is mentioned viewing from the PF motor pinion gear side.
Figure 2-8 shows a paper feeding mechanism block diagram, which includes the parts along the PF motor drive-transmission paths.
Operating Principles
Printer Mechanism Operation
38
EPSON Stylus Scan 2000
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 2000
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
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 2-5, "PF Motor Specifications," on page 37 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.
PF roller Eject rollers Platen 3mm bottom margin may contact printhead
Top view Bushing 6
Pump Planetary Lever
Right-side view Carriage
New Feeding Method (from COLOR 740)
Moved to a 5 degree angle
CR Lock Lever Paper Eject roller Middle frame Pump Planetary Lever Guide
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.
This area remains stable
Figure 2-10. 3mm improved margin (viewed from right side)
Operating Principles
Printer Mechanism Operation
40
EPSON Stylus Scan 2000
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
Revision A
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
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. 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. 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
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 roller transmission gear
Figure 2-12. Paper Pickup Mechanism
Operating Principles
Printer Mechanism Operation
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EPSON Stylus Scan 2000
Revision A
2.2.5 Ink System
Ink system mechanism consists of 1) cap mechanism, 2) pump mechanism, 3) carriage lock mechanism, 4) waste ink absorber and 5) ink sequence. Out of these mechanisms, 1) to 4) are physical mechanism and parts which are mounted on the printer mechanism and 5) the ink sequence is performed automatically by the firmware. The EPSON Stylus Scan 2000 has no engage/ disengage mechanism, meaning the pump and platen are always at work when the PF motor operates. The figures below show printhead positions when the ink system and various ink-pumping sequences are performed. PF roller drive gear Printable Area
2976 dots (360-dpi)
A
B
C
D
E
F
Eject roller drive gear
A. ASF Pick-up position B. Flushing C. Wiping/rubbing position D. Flushing position E. Ink Discharge position F. Cap cleaning position
Figure 2-14. Major Ink Sequence Positions on Carriage
Carriage lock lever Cleaner blade Eject roller transmission gear PF (pump) motor pinion gear
Pump roller Cap unit
Figure 2-13. Ink System Mechanism
Operating Principles
Printer Mechanism Operation
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EPSON Stylus Scan 2000
Revision A
2.2.6 Pump, Carriage Lock, Head Cleaner Mechanism
n the EPSON Stylus Scan 2000, there is no switch or mechanism to switch between the ink pump and paper feed operations. Therefore, whenever the paper feed/pump motor rotates, the pump-drive roller inside the pump unit rotates. However, the rotational direction of the rollers determines whether or not the pump sucks ink. Also, even if the pump rotates in the ink-absorption direction, ink is not absorbed if the carriage is in the false-absorption position. Figure 2-13 shows process of conveying motive power to the pump drive roller. The process of conveying the motive power to the paper eject roller is shown in Figure 2-15. This motive power is conveyed to Gear C through Gear B. The lever that drives Gear C, the carriage lock, and the head-cleaner mechanism is shown separately but it is constructed as one unit. Since the engagement of these parts depends on the tension of the compression spring, if the lever is burdened, only Gear C and the pump roller rotate and no more motive power is conveyed to the lever part.
Axis of Paper eject roller
Gear A
Gear B Compression spring
Gear C
Pump drive roller
Figure 2-15. Pump Mechanism Power Transmission Process
The table below shows PF/Pump motor rotational direction and pump system operation.
Operating Principles
Printer Mechanism Operation
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EPSON Stylus Scan 2000
Revision A
Table 2-8. Pump Motor Rotation and Operation
PF motor pinion gear rotation (looking at gear surface) Clockwise (CW) forward rotation Pump unit operation 1) Release the tubes 2) Disengage Head Cleaner 3) Disengage carriage lock 1) Squeeze tubes to pump ink 2) Engage Head cleaner 3) Engage carriage lock Low speed Regular absorption High speed
Table 2-9. Pumping modes
Pump Mode Revolutions 0.38rev/second 1.3 rev/second 2.6rev/second 3.38rev/second Absorption 0.06ml/second 0.2ml/second 0.4ml/second 0.54ml/second
Counterclockwise (CCW) backward rotation
Super high speed
Refer to Figure 2-16 in the right column which shows the pump operations at clockwise and counterclockwise rotation. During ink-absorptive operations such as cleaning and flushing (but not during normal printing), ink drains from the ink cartridge to the waste-ink pads through the cap. During printing and flushing, ink is fired out of the nozzles by the PZT. But during absorption operations the head is capped and ink is sucked off the nozzle plate by the force of the vacuum created by the pump drive and the PZT does not move. Counter-Clockwise Revolution Clockwise Revolution
Tube squeezed
Tube released
Figure 2-16. Pump Roller Rotation and it's Operation
Operating Principles
Printer Mechanism Operation
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EPSON Stylus Scan 2000
Revision A
2.2.6.1 Cap Mechanism
The cap mechanism prevents ink from thickening and sticking on the head surface when the printer is not in operation and it also plays a part in cleaning the printhead. During the power-off sequence, the printhead moves to the right where the head surface and cap come into contact, and the head surface contacts the rubber frame of the cap surface until the power is turned back on. An absorber pad is spread in the cap and can hold a certain amount of ink which is absorbed from the head without draining it to the waste ink pad. Also, below the absorber pad, there are two valves that control the adhesion pressure between the head and cap surface. There is also one exit and tube to drain ink to the waste ink pads. Position A
Position A
Carriage flag
Positions B and C
Ink Eject Valve Negative Pressure
Valve When the carriage is out of the HP (for example in the printable area or paper feed position), the valves on the cap mechanism stay in Position A (closed) as shown to the right. Position B When the carriage returns to the right, it catches the carriage flag on the cap mechanism. This raises the cap to meet the head surface. This position is used for head cleaning because the valves are still closed but the rubber around the cap traps air, so when the pump sucks air away from the cap, a vacuum is created and ink is sucked away from the head surface. Ink absorption and slight ink absorption are performed in Position B. Position C By moving the carriage a little further