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Color Inkjet Printer
EPSON Stylus Color 680/685/777/777i
®
SEIJ00010
Notice
o 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, or otherwise, without the prior written permission of SEIKO EPSON CORPORATION. o 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. o The contents of this manual are subject to change without notice. o 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. o 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 © 2000 SEIKO EPSON CORPORATION. Imaging & Information Product Division TPCS Quality Assurance Center TPCS Department
PRECAUTIONS
Precautionary notations throughout the text are categorized relative to 1)Personal injury and 2) damage to equipment. DANGER WARNING Signals a precaution which, if ignored, could result in serious or fatal personal injury. Great caution should be exercised in performing procedures preceded by DANGER Headings. Signals a precaution which, if ignored, could result in damage to equipment.
The precautionary measures itemized below should always be observed when performing repair/maintenance procedures.
DANGER
1. ALWAYS DISCONNECT THE PRODUCT FROM THE POWER SOURCE AND PERIPHERAL DEVICES PERFORMING ANY MAINTENANCE OR REPAIR PROCEDURES. 2. NO WORK 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. 4. WHEN DISASSEMBLING OR ASSEMBLING A PRODUCT, MAKE SURE TO WEAR GLOVES TO AVOID INJURIER FROM METAL PARTS WITH SHARP EDGES.
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 COMPONENTS BY THE MANUFACTURE; INTRODUCTION OF SECOND-SOURCE ICs OR OTHER NONAPPROVED COMPONENTS MAY DAMAGE THE PRODUCT AND VOID ANY APPLICABLE EPSON WARRANTY.
About This Manual
This manual describes basic functions, theory of electrical and mechanical operations, maintenance and repair procedures of the printer. 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.
Manual Configuration
This manual consists of six chapters and Appendix. CHAPTER 1. PRODUCT DESCRIPTIONS Provides a general overview and specifications of the product. CHAPTER 2. OPERATING PRINCIPLES Describes the theory of electrical and mechanical operations of the product. CHAPTER 3. TROUBLESHOOTING Describes the step-by-step procedures for the troubleshooting. CHAPTER 4. DISASSEMBLY / ASSEMBLY Describes the step-by-step procedures for disassembling and assembling the product. CHAPTER 5. ADJUSTMENT Provides Epson-approved methods for adjustment. CHAPTER 6. MAINTENANCE Provides preventive maintenance procedures and the lists of Epson-approved lubricants and adhesives required for servicing the product. APPENDIX Provides the following additional information for reference: · Connector pin assignments · Electric circuit boards components layout · Electrical circuit boards schematics · Exploded diagram & Parts List
Symbols Used in this Manual
Various symbols are used throughout this manual either to provide additional information on a specific topic or to warn of possible danger present during a procedure or an action. Be aware of all symbols when they are used, and always read NOTE, CAUTION, or WARNING messages.
A D J U S T M E N T R E Q U IR E D
Indicates an operating or maintenance procedure, practice or condition that is necessary to keep the product's quality. Indicates an operating or maintenance procedure, practice, or condition that, if not strictly observed, could result in damage to, or destruction of, equipment. May indicate an operating or maintenance procedure, practice or condition that is necessary to accomplish a task efficiently. It may also provide additional information that is related to a specific subject, or comment on the results achieved through a previous action. I.ndicates an operating or maintenance procedure, practice or condition that, if not strictly observed, could result in injury or loss of life.
C A U T IO N
C H E C K P O IN T
W A R N IN G
Revision Status
Revision
A
Issued Date
August 10, 2000 First Release Revision:
Description
B
August 31, 2000
n Added disassembly and reassembly cautions to 4.2.1 Housing Removal n Changed the resolution of bit map images when producing PDF files for clearer reading.
C
September 28, 2000
Revision: n Corrections of Chapter 5 Adjustment. Revision: n Chapter 4, Page 62: Added the contents of "Warning" n Chapter 4, Page 63: Added the contents of "Caution" n Chapter 4, Page 75: Changed the picture of Figure 4-15 for easier viewing Revision: n Added Stylus Color 685 to the manual. n Page 10: Corrected the contents of theTable 1-1. n Page 11: Corrected the miss description of "1.2.3 Paper Feeding".
D
November 22, 2000
E
February 1, 20001
n Page 21: Corrected the contents of the Table 1-12 and added notes to the table. n Chaper 3: Added all the table titles n Page 45: Corrected the contents of the Table 3-3 and added notes below the table. n Page 46: Corrected "Check Table's table no." of Table 3-4 and added new symptom, possible causes.
CONTENTS
Chapter 1 PRODUCT DESCRIPTION
1.1 FEATURES ......................................................................................................... 4 1.2 SPECIFICATIONS ............................................................................................ 1.2.1 Physical Specification .................................................................................. 1.2.2 Printing Specification .................................................................................. 1.2.3 Paper Feeding .............................................................................................. 1.2.4 Input Data Buffer ......................................................................................... 1.2.5 Electric Specification ................................................................................... 1.2.6 Environmental Condition ............................................................................. 1.2.7 Reliability .................................................................................................... 1.2.8 Safety Approvals ......................................................................................... 1.2.9 Acoustic Noise ............................................................................................. 1.2.10 CE Marking ............................................................................................... 5 5 5 6 6 6 7 7 7 7 7 1.5.2 Paper Specification .................................................................................... 1.5.2.1 Cut Sheet ........................................................................................... 1.5.2.2 Transparency, Glossy Paper .............................................................. 1.5.2.3 Envelope ............................................................................................ 1.5.2.4 Index Card ......................................................................................... 1.5.3 Printing Area .............................................................................................. 1.5.3.1 Cut Sheet ........................................................................................... 1.5.3.2 Envelopes .......................................................................................... 18 18 18 18 19 20 20 21
1.6 INK CARTRIDGE ........................................................................................... 22 1.6.1 Black Ink Cartridge ................................................................................... 22 1.6.2 Color Ink Cartridge .................................................................................... 22
Chapter 2 Operating Principles
2.1 Overview ............................................................................................................ 2.1.1 Printer Mechanism ..................................................................................... 2.1.2 Printhead .................................................................................................... 2.1.2.1 Printing Process ................................................................................. 2.1.2.2 Printing Method ................................................................................. 2.1.3 Carriage Mechanism .................................................................................. 2.1.4 Paper Feeding Mechanism ......................................................................... 2.1.5 Paper Loading Mechanism (ASF Unit) ..................................................... 2.1.6 Ink System Mechanism ............................................................................. 2.1.6.1 Pump Unit & Wiper mechanism ....................................................... 2.1.6.2 Capping Mechanism .......................................................................... 2.2 Electrical Circuit Operating Principles .......................................................... 2.2.1 C383 PSB/PSE board ................................................................................ 2.2.2 C383 MAIN Board .................................................................................... 2.2.2.1 Main elements ................................................................................... 2.2.2.2 Printhead Driver Circuit .................................................................... 2.2.2.3 PF Motor (PF/ PUMP/ ASF Motor) Driver Circuit .......................... 2.2.2.4 CR Motor Driver Circuit ................................................................... 2.2.2.5 Reset Circuit ...................................................................................... 24 24 25 25 26 27 28 29 32 32 33 34 34 37 38 38 39 40 40
1.3 INTERFACE ....................................................................................................... 8 1.3.1 Parallel Interface (Forward Channel) .......................................................... 8 1.3.2 Parallel Interface (Reserve Channel) ......................................................... 11 1.3.3 USB Interface ............................................................................................ 12 1.3.4 Prevention of Data Transfer Time-out ....................................................... 13 1.3.5 Interface Selection ..................................................................................... 13 1.3.6 IEEE1284.4 Protocol ................................................................................. 13 1.4 OPERATOR CONTROLS .............................................................................. 1.4.1 Operating Switch ....................................................................................... 1.4.2 Control Panel ............................................................................................. 1.4.2.1 Switches ............................................................................................. 1.4.2.2 Indicators ........................................................................................... 1.4.3 Panel Functions .......................................................................................... 1.4.4 Printer Condition and Panel Status ............................................................ 1.4.5 Printer Initialization ................................................................................... 1.4.6 Errors ......................................................................................................... 14 14 14 14 14 15 16 17 17
1.5 PAPER ............................................................................................................... 18 1.5.1 Paper Handling .......................................................................................... 18
2.2.2.6 EEPROM Control Circuit ................................................................. 41 2.2.2.7 Sensor Circuit .................................................................................... 41
Chapter 3 Troubleshooting
3.1 Overview ............................................................................................................ 44 3.2 Troubleshooting with LED Error Indications ............................................... 45
5.2.4 USB ID input ........................................................................................... 5.2.5 Head Cleaning Operation ........................................................................ 5.2.6 Initial Ink Charge Operation .................................................................... 5.2.7 Refurbishment for DOA .......................................................................... 5.2.8 Protection Counter Check/Reset .............................................................. 5.2.9 Check pattern printing ............................................................................. 5.2.10 EEPROM check function ...................................................................... 5.2.11 CSIC Information ..................................................................................
104 106 107 108 109 111 112 113
Chapter 4 Disassembly and Assembly
4.1 Overview ............................................................................................................ 4.1.1 Precautions ................................................................................................. 4.1.2 Tools .......................................................................................................... 4.1.3 Work Completion Check ........................................................................... 4.2 Disassembly ....................................................................................................... 4.2.1 Housing removal ........................................................................................ 4.2.2 Operation Panel removal ........................................................................... 4.2.3 Printhead removal ...................................................................................... 4.2.4 CR motor removal ..................................................................................... 4.2.5 Waste drain ink pad unit removal .............................................................. 4.2.6 Circuit board removal ................................................................................ 4.2.7 LD Roller removal ..................................................................................... 4.2.8 HP/PE Sensor removal .............................................................................. 4.2.9 Ink system unit removal (Cap & Pump unit ) ............................................ 4.2.10 Paper Eject Roller removal ...................................................................... 4.2.11 PF motor removal .................................................................................... 4.2.12 CR unit removal ....................................................................................... 4.2.13 Paper feed roller removal ......................................................................... 4.2.14 Disassembling ASF frame unit ................................................................ 57 58 60 61 62 63 65 66 68 70 72 76 80 82 84 86 88 91 94
Chapter 6 Maintenance
6.1 Overview .......................................................................................................... 6.1.1 Cleaning ................................................................................................... 6.1.2 Service Maintenance ................................................................................ 6.1.3 Lubrication ............................................................................................... 115 115 116 116
Chapter 7 Appendix
7.1 Connector Summary ...................................................................................... 121 7.1.1 Major Component Unit ............................................................................ 121 7.1.2 EEPROM Address Map ........................................................................... 124 7.2 Component Layout ......................................................................................... 128 7.3 Exploded Diagram .......................................................................................... 130 7.4 Parts List ......................................................................................................... 135 7.5 Electrical Circuits ........................................................................................... 138
Chapter 5 Adjustment
5.1 Overview ............................................................................................................ 5.1.1 Required Adjustment ................................................................................. 5.1.2 Adjustment Program feature ...................................................................... 5.1.3 Adjustment Program Installation Procedure .............................................. 5.2 Adjustment Program Execution ................................................................... 5.2.1 Adjustment Program Initial Setting menu ............................................... 5.2.2 Head ID Input .......................................................................................... 5.2.3 Bi-D Adjustment ...................................................................................... 98 98 99 99
100 100 100 102
CHAPTER
PRODUCT DESCRIPTION
EPSON Stylus COLOR 680/685/777/777i
Revision E
1.1 FEATURES
The major features of EPSON color inkjet printers EPSON Stylus COLOR 680/685/ 777/777i are:
o High Color Print Quality n 2880 (H) X 720 (V) dpi printing n Four Color Printing (YMCK) n Traditional and New Microweave o Built-in Auto Sheet Feeder n Holds 100 cut-sheets (64g/m2) n Holds 10 envelopes n Holds 1 transparency films o Two Built-in Interfaces n Bi-directional parallel I/F (IEEE-1284 level 1 device) n USB o Windows/Macintosh exclusive
Figure 1-1. Product's external view
PRODUCT DESCRIPTION
FEATURES
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EPSON Stylus COLOR 680/685/777/777i
Revision E
1.2 SPECIFICATIONS
This section covers specifications of the printers.
Horizontal Resolution 360 dpi 720 dpi 1440 dpi
Table 1-2. Raster Graphics Mode
Printable Area 209.8mm(8.26 inch) 209.8mm(8.26 inch) 209.8mm(8.26 inch) Available Dot 2976 5952 11904 CR Speed 60.452cm/s(23.8 IPS) 50.80cm/s(20 IPS) 50.80cm/s(20 IPS)
1.2.1 Physical Specification
o Weight: o Dimension:
Storage: Printing: 450 mm (W) x 246 mm (D) x 182 mm (H) 450 mm (W) x 547 mm (D) x 279 mm (H) 4.1kg (without ink cartridges)
o Control Code n ESC/P Raster command n EPSON Remote command o Character Tables n Two international character sets:
- PC 437 (US, Standard Europe)
1.2.2 Printing Specification
o Print Method n On demand ink jet o Nozzle Configuration n Monochrome 144 nozzles (48 x 3 staggered) n Color 48 nozzles x 3 (Cyan, Magenta, Yellow) o Print Direction n Bi-direction with logic seeking o Print Speed & Printable Columns Table 1-1. Character Mode
Character Pitch 10 CPI (Pica) Printable Column 82 LQ Speed 238 CPS*
o Typeface n Bit map LQ font:
EPSON Courier 10 CPI
*This value is the speed of normal-dot printing.
PRODUCT DESCRIPTION
SPECIFICATIONS
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EPSON Stylus COLOR 680/685/777/777i
Revision E
[220 240V Version] Rated Voltage: Input Voltage Range: Rated Frequency Range: Input Frequency Range: Rated Current: Power Consumption:
1.2.3 Paper Feeding
o Feed Method n Friction feed with ASF o Paper Path n Cut-sheet ASF (Top entry, Front out) o Feed Speed n 126ms (4.96 inch) n 114.3mm/sec(4.5 inch/sec)
(10.16mm (0.4inch) feed) (Fast, Continues feed)
Insulation Resistance: Dielectric Strength:
1.2.4 Input Data Buffer
n 32KB
AC220V240V AC198264V 5060Hz 49.560.5Hz 0.2 A (for Stylus Color 860) 0.2 A (for Stylus Color 1160) Approx. 17W (ISO10561 Letter Pattern) Approx. 2.5W in standby mode Energy Star compliant 100M ohms min. (between AC line and chassis, DC 500V) AC 1500V rms. 1 minute (between AC line and chassis)
1.2.5 Electric Specification
[120V Version] Rated Voltage: Input Voltage Range: Rated Frequency Range: Input Frequency Range: Rated Current: Power Consumption: AC120V AC99132V 50 60Hz 49.5 60.5Hz 0.4A Approx. 17W (ISO10561 Letter Pattern) Approx. 2.5W in standby mode Energy Star compliant 100M ohms min. (between AC line and chassis, DC 500V) AC 1000V rms. 1 minutes or AC 1200V rms. 1 second (between AC line and chassis)
Insulation Resistance: Dielectric Strength:
PRODUCT DESCRIPTION
SPECIFICATIONS
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EPSON Stylus COLOR 680/685/777/777i
Revision E
1.2.6 Environmental Condition
o Temperature n Operating: n Non-operating: o Humidity n Operating:
20 to 80% RH (without condensation / see the figure below for condition) 5 to 85% RH (without condensation / with shipment container) 10 to 35°C (see the figure below for condition) -20 to 60°C (with shipment container) 1 month at 40°C and 120 hours at 60°C
1.2.7 Reliability
Total Print Volume: Print Head Life: 50,000 pages (A4, Letter) or 5 years although less than 50.000 pages printing 3 billion dots/nozzle
1.2.8 Safety Approvals
[120V Version] Safety Standards: EMI: [220240V Version] Safety Standards: EMI: UL1950 CSA22.2 No.950 FCC part 15 subpart B Class B CSA C108.8 Class B EN60950 (VDE) EN55022 (CISPR Pub.22) Class B AS/NZS 3548 Class B
n Non-operating: o Resistance to Shock n Operating: n Non-operating: o Resistance to Vibration n Operating: n Non-operating:
1G, within 1 ms 2G, within 2 ms (with shipment container)
0.15G 0.50G (with shipment container)
1.2.9 Acoustic Noise
Level: Approx. 47dB(A) (According to ISO 7779) -Used media : Plain Paper - Print Quality: Fine
90 80 70 60
1.2.10 CE Marking
[220240V Version] Low Voltage Directive 73/23/EEC: EMC Directive 89/336/EEC: EN60950 EN55022 Class B EN61000-3-2 EN61000-3-3 EN50082-1 IEC801-2 IEC801-3 IEC801-4
Humidity (%)
50 40 30 20
10
20
27 30
35
40
Temperature (°C)
Figure 1-2. Temperature/Humidity Range
PRODUCT DESCRIPTION
SPECIFICATIONS
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EPSON Stylus COLOR 680/685/777/777i
Revision E
1.3 INTERFACE
The EPSON Stylus COLOR 680/685/777/777i provide USB and parallel interface as standard. DATA -STROBE
data byte n data byte n+1
thold tsetup BUSY tready -ACKNLG treply tack tnbusy tbusy tstb tnext
1.3.1 Parallel Interface (Forward Channel)
Transmission Mode: Synchronization: Handshaking: Signal Level: Adaptable Connector: 8 bit parallel, IEEE-1284 compatibility mode By STROBE pulse BY BUSY and ACKNLG signal TTL compatible level 57-30360 (amphenol) or equivalent
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:
Figure 1-3. Data Transmission Timing Table 1-3.
Parameter tsetup thold tstb tready tbusy tt-out* tt-in** treply tack tnbusy tnext Minimum 500ns 500ns 500ns 0 0 500ns 0 0 Maximum 500ns 120ns 200ns 10us -
n During data entry (see data transmission timing). n When input data buffer is full. n During -INIT signal is at low level or during hardware initialization. n During printer error (see -ERROR signal). n When the parallel interface is not selected.
ERROR signal is at low level when the printer is in one of the following states:
n Printer hardware error (fatal error) n Paper-out error n Paper-jam error n Ink-out error
PE signal is at high level during paper-out error.
* Rise and fall time of every output signal. ** Rise and fall time of every input signal. *** Typical timing for tack is shown on the following page.
PRODUCT DESCRIPTION
INTERFACE
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EPSON Stylus COLOR 680/685/777/777i
Revision E
Table 1-4. Typical Time of tack
Parallel I/F Mode High Speed Normal Speed Typical Time of tack 0.5us 2us 1 2 3 4 5 VOH = 2.4V VOL = 0.4V 6 7 8 9 10 IIH IIL CI 0.32mA 12mA 50pF VIH = 2.0V VIL = 0.8V 11 12 13 14 Pin No.
Table 1-6. Connector Pin Assignment and Signals
Signal Name Return GND Pin 19 20 21 22 23 24 25 26 27 28 29 28 28 30 In/Out Functional Description The strobe pulse. Read-in of data is performed at the falling edge of this pulse.
-STROBE DATA0 DATA1 DATA2 DATA3 DATA4 DATA5 DATA6 DATA7 -ACKNLG BUSY PE SLCT -AFXT
In In In In In In In In In Out Out Out Out In
Table 1-5. Signal Level: TTL Compatible (IEEE-1284 level 1 device)
Parameter VOH* VOL* IOH* IOL* CO VIH VIL Minimum -0.5V 0.8V Maximum 5.5V 0.32mA 12mA 50pF 2.0V Condition
The DATA0 through DATA7 signals represent data bits 0 to 7, respectively. Each signal is at high level when data is logical 1 and low level when data is logical 0.
This signal is a negative pulse indicating that the printer can accept data again. A high signal indicates that the printer cannot receive data. A high signal indicates paper-out error. Always at high level when the printer is powered 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 is necessary. A low signal indicates printer error condition. Not used. Pulled up to +5V via 3.9 K ohm resistor.
*
A low logic level on the Logic H signal is 2.0V or less when the printer is powered off, and this signal is equal to or exceeding 3.0V when the printer is powered on. The receiver shall provide an impedance equivalent to 7.5K ohm to ground.
31
-INIT
30
In
32 36 18
-ERROR -SLIN Logic H
29 30 -
Out In Out
PRODUCT DESCRIPTION
INTERFACE
9
EPSON Stylus COLOR 680/685/777/777i Table 1-6. Connector Pin Assignment and Signals (continued)
Pin No. 35 17 16,33, 19-30 15,34 Signal Name +5V Chassis GND GND NC Return GND Pin In/Out Out Functional Description Pulled up to +5V via 3.3K ohm resistor. Chassis GND Signal GND Not connected
Revision E
NOTE: In/Out refers to the direction of signal flow seen from the printer side.
PRODUCT DESCRIPTION
INTERFACE
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EPSON Stylus COLOR 680/685/777/777i
Revision E Table 1-7. Connector Pin Assignment and Signals (continued)
Pin No. 32 36 18 35 17 Signal Name -DataAvail / DataBit-0,4 1284-Active Logic-H +5V Chassis GND GND NC Return GND Pin 29 30 In/Out Out In Out Out Functional Description Data available signal and reverse channel transfer data bit 0 or 4. 1284 active signal. Pulled up to +5V via 3.9K ohm resistor. Pulled up to +5V via 3.3K ohm resistor. Chassis GND Signal GND Not connected
1.3.2 Parallel Interface (Reserve Channel)
Transmission Mode: Adaptable Connector Synchronization: Handshaking: Data Trans. Timing: Signal Level: IEEE-1284 nibble mode See forward channel. Refer to the IEEE-1284 specification Refer to the IEEE-1284 specification Refer to the IEEE-1284 specification IEEE-1284 level 1 device See forward channel.
Table 1-7. Connector Pin Assignment and Signals
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 31 Signal Name HostClk DATA0 DATA1 DATA2 DATA3 DATA4 DATA5 DATA6 DATA7 PtrClk PtrBusy / DataBit-3,7 AckDataReq / DataBit-2,6 Xflag / DataBit-1,5 HostBusy -INIT Return GND Pin 19 20 21 22 23 24 25 26 27 28 29 28 28 30 30 In/Out In In In In In In In In In Out Out Out Out In In Printer clock signal. Printer busy signal and reverse channel transfer data bit 3 or 7. Acknowledge data request signal and reverse channel transfer data bit 2 or 6. X-flag signal and reverse channel transfer data bit 1 or 5. Host busy signal. Not used. The DATA0 through DATA7 signals represent data bits 0 to 7, respectively. Each signal is at high level when data is logical 1 and low level when data is logical 0. These signals are used to transfer the 1284 extensibility request values to the printer. Functional Description Host clock signal.
16,33, 19-30 15,34
NOTE: In/Out refers to the direction of signal flow from the printer's point of view. Extensibility Request: The printer responds affirmatively when the extensibility request values are 00H or 04H, which means, 00H: 04H: Request Nibble Mode Reverse Channel Transfer. Request Device ID; Return Data Using Nibble Mode Rev Channel Transfer.
PRODUCT DESCRIPTION
INTERFACE
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EPSON Stylus COLOR 680/685/777/777i
Device ID: The printer sends the following device ID string when requested. When IEEE1284.4 is enabled, [00H] [5AH] MFG: EPSON; CMD: ESCPL2, BDC, D4; MDL: Stylus[SP]COLOR[SP]XXX*; CLS: PRINTER; DES: EPSON[SP]Stylus[SP]COLOR[SP]XXX*; When IEEE1284.4 is disabled, [00H] [57H] MFG: EPSON; CMD: ESCPL2, BDC; MDL: Stylus[SP]COLOR[SP]XXX*; CLS: PRINTER; DES: EPSON[SP]Stylus[SP]COLOR[SP]860/1160; *XXX is 777 (for EAI spec) or 680 (for EURO/ASIA spec) Note 1: [00H] denotes a hexadecimal value of zero. Note2: MDL value depends on the EEPROM setting. Note3: CMD value depends on the IEEE1284.4 setting. Pin #2 Pin #1
Revision E
1.3.3 USB Interface
Standard: Based on: "Universal Serial Bus Specifications Rev. 1.0" "Universal Serial Bus Device Class Definition for Printing Devices Version 1.0" 12Mbps (Full Speed Device) NRZI USB Series B 2 meters
Bit Rate: Data Encoding: Adaptable Connector: Recommended Cable Length:
Table 1-8. Connector Pin Assignment and Signals
Pin No. 1 2 3 4 Signal Name VCC -Data +Data Ground I/O Bi-D Bi-D Function Description Cable power. Max. power consumption is 2mA. Data Data, pull up to +3.3 V via 1.5K ohm resistor. Cable ground
Pin #3
Pin #4
Figure 1-4. USB Pin Assignment
PRODUCT DESCRIPTION
INTERFACE
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EPSON Stylus COLOR 680/685/777/777i
Revision E o 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.
1.3.4 Prevention of Data Transfer Time-out
Generally, hosts abandon data transfer to peripherals when the peripheral is in the busy state for dozens of seconds continuously. To prevent this kind of time-out, the printer receives data very slowly, several bytes per minute, even if the printer is in the busy state. The slowdown starts when the remaining input buffer becomes several hundreds of bytes, and the printer finally gets into the busy state continuously when the input buffer is full. USB and IEEE1284.4 on the parallel interface do not require such function.
o Off
An initial state is compatible interface and never starts IEEE1284.4 communication even if magic strings (1284.4 synchronous commands) are received.
1.3.5 Interface Selection
The printer has two built-in interfaces: the USB and parallel interface. These interfaces are selected automatically.
o Automatic Selection
In this automatic interface selection mode, the printer is initialized to the idle state while scanning which interface receives data when it is powered on. Then the interface which received data first is selected. When the host stops data transfer and the printer is in the stand-by state for seconds, the printer is returned to the idle state. As long as the host sends data or the printer interface is in the busy state, the selected interface is let as it is.
o Interface State and Interface Selection
When the parallel interface is not selected, the interface gets into the busy state. When the printer is initialized or returned to the idle state, the parallel interface gets into the ready state. Note that the interrupt signal such as the -INIT signal on the parallel interface is not effective while that interface is not selected.
1.3.6 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.
o Automatic Selection
An initial state is compatible interface and starts IEEE1284.4 communication when magic strings (1284.4 synchronous commands) are received.
PRODUCT DESCRIPTION
INTERFACE
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EPSON Stylus COLOR 680/685/777/777i
Revision E
1.4 OPERATOR CONTROLS
1.4.1 Operating Switch
Operating switch is located on the control panel.
1.4.2.2 Indicators
(1) Power Lights when the operating switch is "ON" and AC power is supplied. (2) Error Lights or blinks when some error has occur to the printer.
1.4.2 Control Panel
1.4.2.1 Switches
There are two non-lock type push switches, one lock-type push switch, and two LED lights.
2
1
Power Maintenance
Ink Cartridge replacement
Figure 1-5. Control Panel
PRODUCT DESCRIPTION
OPERATOR CONTROLS
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EPSON Stylus COLOR 680/685/777/777i
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.
1.4.3 Panel Functions
Switch
Table 1-11. Special Setting Mode
Function · Initialize EEPROM. · Reset the ink overflow counter in the EEPROM. Maintenance Ink Cartridge replacement (10 seconds)
Table 1-9. Panel Functions
Switch Maintenance Function · Loads or Ejects the Paper (Pushing within 3seconds). · Starts the Cleaning of head (Pushing for 3seconds). · When carriage is on the Ink Cartridge change position, return carriage from Ink Cartridge change position. · Starts the Ink Cartridge change sequence. *
Ink Cartridge replacement
* This function is not available in printing status.
Table 1-10. Panel Functions with Power On
Switch Maintenance Ink Cartridge replacement Maintenance + Ink Cartridge replacement · Start status printings. · Select IEEE 1284.4 mode for parallel I/F. *1 · Enters the special setting mode (Factory use only). *3 Function
*1 Not described in the user's manual. *2 See Table 1-11 for detailed information.
PRODUCT DESCRIPTION
OPERATOR CONTROLS
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EPSON Stylus COLOR 680/685/777/777i
Revision E
*1: See 1.4.6 Errors for detailed information. Blink2: On 0.2 sec + Off 0.2 sec + On 0.2sec + Off 0.4 sec.
1.4.4 Printer Condition and Panel Status
Table 1-12. Printer Condition and LED Status
Indicators Printer Status Power Power ON condition Ink sequence Ink Cartridge change mode Data processing Paper Out Paper jam condition Ink end (Black) Ink level low (Black) Ink end (Color) Ink level low (Color) Ink end (Black and Color) No Ink Cartridge (Black and Color) Reset, Timer IC reset, EEPROM clear Ink Overflow Counter reset Maintenance request (Ink Overflow Counter error) Fatal error Special setting *1 *1 *1 *1 *1 *1 On Blink Blink Blink On (1s) On (2s) Alt Blink Off Blink2 Error On On On -> Blink Blink On -> Blink2 Blink On -> On On On (1s) On (2s) Alt Blink On Blink2 10 6 5 9 4 3 8 8 8 8 8 7 2 1 Priority
" - " : Indicator status don't change. " A -> B " :A is a indicator condition when carriage is on Home Position. B is a indicator condition in Ink exchange sequence.
PRODUCT DESCRIPTION
OPERATOR CONTROLS
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EPSON Stylus COLOR 680/685/777/777i
Revision E
1.4.5 Printer Initialization
There are three kinds of initialization methods, and the following explains each initialization. 1. Power-on Initialization This printer is initialized when turning the printer power on, or printer recognized the cold-reset command (remote RS command). When printer is initialized, the following actions are performed: (a) Initializes printer mechanism. (b) Clears input data buffer. (c) Clears print buffer. (d) Sets default values. 2. Operator Initialization This printer is initialized when turning the printer power on again within 10 seconds from last power off, or printer recognized the -INIT signal (negative pulse) of parallel interface. When printer is initialized, the following actions are performed: (a) Cap the printer head. (b) Eject a paper. (c) Clears input data buffer. (d) Clears print buffer. (e) Sets default values. 3. Software Initialization The ESC@ command also initialize the printer. When printer is initialized, the following actions are performed: (a) Clears print buffer. (b) Sets default values.
1.4.6 Errors
o Ink Out
When the printer runs out most of the ink of any color, it indicates ink-low and keeps printing. When the printer runs out the whole ink of any color, it stops printing and indicates ink-out error. User is then requested to install a new inkcartridge in this state. An ink-cartridge that has been taken out once should never be used again. Re-installation of the cartridge not filled fully upsets the ink level detection and may eventually cause a serious problem in the print head.
o Paper Out
When the printer fails to load a sheet, it goes into a paper out error.
o Paper Jam
When the printer fails to eject a sheet, it goes into a paper jam error.
o No Ink-Cartridge
When the printer detects that ink-cartridge comes off, or failed to read or write CSIC data, it goes into this error mode.
o Maintenance Request
When the total amount of ink wasted through cleanings and flushing reaches to the limit, printer indicates this error and stops. In such a case, the absorber in the printer enclosure needs to be replaced with new one by service personnel.
o Fatal Errors
Carriage control error.
PRODUCT DESCRIPTION
OPERATOR CONTROLS
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EPSON Stylus COLOR 680/685/777/777i
Revision E
1.5 PAPER
1.5.1 Paper Handling
Do not perform reverse feed more than 1.8mm (0.07").
1.5.2.2 Transparency, Glossy Paper
[Size]
A4: Letter:
[Thickness]
Width 210mm (8.3") x Length 297mm (11.7") Width 216mm (8.5") x Length 279mm (11.0")
1.5.2 Paper Specification
1.5.2.1 Cut Sheet
[Size] A4: A5: A6: Letter: Half Letter: B5: Legal: Executive: [Thickness] 0.08mm (0.003") - 0.11mm (0.004") [Weight] 64g/m2 (17Ib.) - 90g/m2 (24Ib.) [Quality] Exclusive paper, Bond paper, PPC [ASF hopper available capacity] 100 sheets Note1: No wrinkled, scuffing, torn or folded paper be used. Note2: No curled paper more than 5 mm be used. Width 210mm (8.3") x Length 297mm (11.7") Width 148mm (5.8") x Length 210mm (8.3") Width 105mm (4.1") x Length 148mm (5.8") Width 216mm (8.5") x Length 279mm (11.0") Width 139.7mm (5.5") x Length 216mm (8.5") Width 182mm (7.2") x Length 257mm (10.1") Width 216mm (8.5") x Length 356mm (14.0") Width 184.2mm (7.25") x Length 266.7mm (10.5")
0.075mm (0.003") - 0.085mm (0.0033")
[ASF hopper available capacity]
1 sheets
Note: Transparency printing is available only at normal temperature.
1.5.2.3 Envelope
[Size]
No.10: DL: C6:
[Thickness]
Width 241mm (9 1/2") x Length 104.8mm (4 1/8") Width 220mm (8.7") x Length 110mm (4.3") Width 162mm (6.4") x Length 114mm (4.5")
0.16mm (0.006") - 0.52mm (0.02")
[Weight]
45g/m2 (12Ib.) - 75g/m2 (20Ib.)
PRODUCT DESCRIPTION
PAPER
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EPSON Stylus COLOR 680/685/777/777i
[Quality]
Revision E
Bond paper, Plain paper, Air mail
Note1: Envelope printing is available only at normal temperature. Note 2: Keep the longer side of the envelope horizontally at setting. Note 3: Envelope printing is available only in the normal temperature. Note 4: No wrinkled, scuffing, torn or folded paper be used. Note 5: No curled paper more than 5mm be used. Note 6: No paper with glue on flap be used. Note 7: No double envelops nor with window envelops be used. Note 8: Do not print on the back.
1.5.2.4 Index Card
[Size]
A6 Index Card: A5 Index Card: 5 x 8" Index Card: 10 x 8" Index Card:
[Thickness]
Width 105mm (4.1") x Length 148mm (5.8") Width 148mm (5.8") x Length 210mm (8.3") Width 127mm (5.0" x Length 203mm (8.0") Width 127mm (5.0") x Length 203mm (8.0")
Less than 0.23mm (0.0091")
[ASF hopper available capacity]
30 sheets
PRODUCT DESCRIPTION
PAPER
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EPSON Stylus COLOR 680/685/777/777i
Revision E
1.5.3 Printing Area
1.5.3.1 Cut Sheet
See the figure below and tables on the right for printable areas. PW LM RM
Paper Size A4 Letter B5 Legal Left Margin (min.) 3 mm (0.12") 3 mm (0.12") 3 mm (0.12") 3 mm (0.12") 3 mm (0.12") 3 mm (0.12")
Table 1-13. Printing Area
Right Margin (min.) 3 mm (0.12") 3 mm (0.12") 3 mm (0.12") 3 mm (0.12") 3 mm (0.12") 3 mm (0.12") Top Margin (min.) 3 mm (0.12") 3 mm (0.12") 3 mm (0.12") 3 mm (0.12") 3 mm (0.12") 3 mm (0.12") Bottom Margin (min.) 14 mm (0.54") / 3mm (0.12") * 14 mm (0.54") / 3mm (0.12") * 14 mm (0.54") / 3mm (0.12") * 14 mm (0.54") / 3mm (0.12") * 14 mm (0.54") / 3mm (0.12") * 14 mm (0.54") / 3mm (0.12") *
TM
Statement Exclusive
*
Printable Area
PL
Bottom margin can be reduced to 3mm when paper dimension is defined by using command, otherwise it is not reduced (14mm). As for an area between 3mm and 14mm margin, printing quality may decline. ** Refer to 1.5.2 Paper Specification for PW (paper width) and PL (paper length).
BM
Figure 1-6. Printable Area for Cut Sheet
PRODUCT DESCRIPTION
PAPER
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EPSON Stylus COLOR 680/685/777/777i
Revision E
1.5.3.2 Envelopes
LM RM
TM
Printable Area
BM
Figure 1-7. Printable Area for Envelopes Table 1-14. Envelope Margin
Size #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")
PRODUCT DESCRIPTION
PAPER
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EPSON Stylus COLOR 680/685/777/777i
Revision E
1.6 INK CARTRIDGE
1.6.1 Black Ink Cartridge
Type: Color: Print Capacity: Ink Life: Storage Temperature: Storage: Packing: Transit: Dimension: Exclusive Cartridge Black 600 pages/A4 (ISO/IEC 10561 Letter Pattern at 360 dpi) 2 years from date of production -20 oC to 40 oC (within a month at 40 oC) -30 oC to 40 oC (within a month at 40 oC) -30 oC to 60 oC (within 120 hours at 60 oC and within a month at 40 oC) 28.1 mm (W) x 66.85 mm (D) x 43.3 mm (H)
1.6.2 Color Ink Cartridge
Type: Color: Print Capacity: Ink Life: Storage Temperature: Storage: Packing: Transit: Dimension: Exclusive Cartridge Magenta, Cyan, Yellow 300 pages / A4 (360 dpi, 5% duty each color) 2 years from date of production -20 oC to 40 oC (within a month at 40 oC) -30 oC to 40 oC (within a month at 40 oC) -30 oC to 60 oC (within 120 hours at 60 oC and within a month at 40 oC) 43.2 mm (W) x 66.85 mm (D) x 43.3 mm (H)
Figure 1-9. Color Ink Cartridge
Note 1: Ink cartridge can not be refilled. The ink cartridge is prepared only for article of consumption. Note 2: Do not use the ink cartridge which contains life-expired ink. Note 3: Ink will be frozen under -4 oC environment; however, it will be usable after being left at room temperature for more than three hours.
Figure 1-8. Black Ink Cartridge
PRODUCT DESCRIPTION
INK CARTRIDGE
22
CHAPTER
OPERATING PRINCIPLES
EPSON Stylus COLOR 680/685/777/777i
Revision E
2.1 Overview
Paper Eject Roller
This section describes the operating principles of the printer mechanism and electrical circuit boards. The Stylus COLOR 680/777/777i has the following boards:
o Main board:
C383 MAIN (C383 MAIN-B)
PF Motor
PF Roller CR Timing belt
NOTE: C383 MAIN-B is compatible with C383 MAIN. Only some chips or parts are different from each other due to different producers.
Star Wheel Roller
o Power supply board: o Panel board:
C383 PSB/PSE C383 PNL
CR unit HP/PE/IC Sensor sensor
2.1.1 Printer Mechanism
The printer mechanism for Stylus COLOR 680/777/777i is designed newly. But, the basic component of the printer mechanism is same as previous product. This printer consists of Print Head, Carriage Mechanism, Paper Feeding Mechanism, Paper Loading Mechanism, Ink System (Pump Mechanism, Cap Mechanism, and Carriage Lock Mechanism). Like other EPSON ink jet printers, the Stylus COLOR 680/777/777i is equipped with two stepping motors; one for ASF, Paper feeding/ Pump mechanism, and one for CR mechanism. ASF unit uses rear entry front eject system. This ASF unit is also designed newly and single LD roller loads the paper to the printer mechanism. For cap assembly, Stylus COLOR 680/777/777i uses valveless mechanism; new design for this model.
CR lock lever
LD Roller Paper feed back plate
Paper separation pad
ASF Hopper Spring
Clutch mechanism
Pump Assembly CR Motor Cap Assembly
Figure 2-1. Printer Mechanism block diagram
Operating Principles
Overview
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EPSON Stylus COLOR 680/685/777/777i
Revision E
2.1.2 Printhead
The printhead uses a new developed U-CHIPS head and Stylus COLOR 680/777/777i can perform multiple shot printing and variable printing. The CSIC is mounted on the ink cartridge. By storing ink life data, this IC makes it possible to control the ink in ink cartridge unit. The basic operating principles of the printhead, which plays a major role in printing, are the same as previous models; on-demand method which uses PZT (Piezo Electric Element). In order to uniform the amount of ejecting ink, the printhead has its own head ID (6 digits for this printhead) which adjust PZT voltage drive features. The printhead stores the head ID to EEPROM and generates appropriate PZT drive voltage to prevent amount of ink from varying by printheads. Following explains printhead basic components.
Ink Cartridge
CSIC
Nozzle Selector Board
Needle
CSIC Connection Circuit
Filter
o PZT
PZT is an abbreviation of Piezo Electric Element. Certain amount of voltage expands and contracts PTZ. The drive wave generated on MAIN board drives PZT and PZT pushes the top cavity which has ink stored to discharge the ink from each nozzle on the nozzle plate.
Nozzle Plate PZT Cavity
Figure 2-2. Printhead Sectional Drawing
o Ink Cavity
The ink absorbed from the ink cartridge goes through the filter and then is stored temporarily in this tank called "cavity" until PZT is driven.
2.1.2.1 Printing Process
This section explains the process in which the printheads of On-Demand inkjet printers eject ink from each nozzle. 1. Normal State: When no printing signal is sent from PC, or no PZT drive voltage is applied, PZT does not change shape, therefore PZT does not squeeze the cavity. Ink pressure inside the cavity is kept normal. (Refer to Figure 2-3.)
o Nozzle Plate
The board with nozzle holes on the printhead surface is called Nozzle Plate.
o CSIC Connection Circuit
This circuit connects the CSIC mounted on the ink cartridge and the main board. One end of the wire harness connects with the print head cable to the main board.
o Filter
When the ink cartridge is installed, if any dirt or dust around the cartridge needle is absorbed into the head, there is a great possibility of causing nozzle clog and disturbance of ink flow, and finally causing alignment failure and dot missing. To prevent this problem, a filter is set below the cartridge needle, where ink is filtered.
2) Ejecting State: When the print signal is output from the C383 MAIN board, IC (Nozzle Selector) located on the printhead unit latches data once by 1-byte unit. An appropriate PZT
Operating Principles
Overview
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EPSON Stylus COLOR 680/685/777/777i
latched by the nozzle selector is pushed into the cavity by the common voltage applied from the main board. By this operation, ink stored in the cavity spurts out from nozzles.(Refer to Figure 2.1.2.2.) Ink Path PZT Ink Cavity
Revision E o Multiple shot printing
This printing mode is developed to improve the print quality on plain paper or transparencies in low resolution. The multiple shot printing mode uses normal dot and the number of dot shots varies from 1 shot to maximum 4 shots depending on the print data to enable sharp image output even in a low resolution.
o Variable dot printing
This printing mode is developed to improve the print quality on exclusive paper. This mode is basically the same as variable dot printing mode used on other products /; micro dot, middle dot, and large dot compose this mode. Print dot size varies according to print data and this mode enables even sharper image output on exclusive paper. Nozzle Nozzle plate PZT drive voltage
Figure 2-3. Printhead printing process
2.1.2.2 Printing Method
For print dot system, Stylus COLOR 680/777/777i has the following two kinds of printing modes.
n Multiple shot printing n Variable dot printing
The above two printing modes are automatically selected depending on the media and the resolution setting of the printer driver. The following explains each printing mode.
Operating Principles
Overview
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EPSON Stylus COLOR 680/685/777/777i
Revision E
2.1.3 Carriage Mechanism
The carriage mechanism consists of Carriage motor (CR motor), Carriage unit (including printhead), CR timing belt, CR guide shaft, CR guide frame, CR home detector (HP/PE sensor) etc. The carriage mechanism moves the carriage back and forth according to the drive from the carriage motor. The following stepping motor is mounted to drive CR mechanism. (See the table below.) CR home position is detected with the HP/PE/IC sensor and the detection plate molded in the CR unit as following figure. When the CR home position is detected with this sensor, HIGH signal is output to the CPU.
HP detection Lever Right side view CR HP detection plate HP/IC detection Lever
Table 2-1. Carriage Motor Specification
Items Type Drive Voltage Coil Resistance Inductance Drive Method Driver IC Specifications 4-Phase/ 200-Pole HB Stepping motor +42 V +/ - 5% (DRV IC voltage) 7.8 +/ - 10% (per phase at 25 degree) 14 mH +/ - 20%(1KH 1VmA) Bi-Polar drive LB11847
CR HP detection plate
Low signal
High signal
Figure 2-5. CR home position
The drive from CR motor is transferred to the CR unit via CR timing belt. And the CR home position is detected with the HP/PE sensor. This sensor is available as CR HP detector only in the HP (home position) detection sequence & pump operation sequence. (not available in the paper feeding sequence for the CR HP detector because it is used for only PE sensor during the paper feeding sequence.) Moreover, unlike the previous products, this printer dose not have the PG adjustment mechanism (1.7mm).
HP/PE Sensor CR Motor
CR unit
CR Guide shaft
CR Timing belt
Figure 2-4. Carriage Mechanism (Top view)
Operating Principles
Overview
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EPSON Stylus COLOR 680/685/777/777i
Revision E Table 2-2. PF Motor Specifications
Item Motor type Drive voltage Coil Resistance Inductance Driving method Driver IC Description 4-Phase/ 200-Pole HB Stepping motor +42 V +/ - 5% (DRV IC voltage) 7.8 +/ - 10% (per phase) 13.5 mH +/ - 20%(1kH 1Vrms) Bi-Polar drive LB11847
2.1.4 Paper Feeding Mechanism
The paper feeding mechanism consists of Paper feed motor (PF motor), PF roller, Paper eject roller, Star wheel roller, and so on. The paper feeding mechanism feeds paper loaded from ASF using the PF roller and Paper Eject Roller & Star wheel roller. For this mechanism, the PF motor mentioned in the right Table 2-2 is used on this product. The drive of the PF motor is transfer to the PF roller and the Paper Eject Roller as following Figure 2-6. Following shows you how to transfer the PF motor drive to the PF roller and the Paper Eject Roller.
o PF motor drive transmission path
PF Motor Pinion Gear (CW) Combination Gear 16, 21.6 (CCW) Spur Gear 73.6 (CW) Spur Gear 15 (CCW) Combination Gear 37.6, 44.4 (W) Spur Gear 23.2 (CCW) Spur gear 35.2(CW)
Spur Gear 35.2 PF roller Spur Gear 23.2
Spur Gear 15
Combination gear 37.6, 44.4
Figure 2-6. Paper Feeding Mechanism
Paper loaded from ASF is advanced by the following roller. Additionally, the top & end of the paper is detected with the HP/PE sensor. In case the PE sensor dose not detect the paper in the paper loading sequence, the printer detects the "Paper out error". If the paper is detected after complete the paper eject sequence, the printer detects the "Paper jam error".
o Paper feed roller & Paper guide roller (assembled on the Top Frame) Paper
eject roller & Star wheel roller (assembled on the Paper eject frame).
Operating Principles
Overview
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EPSON Stylus COLOR 680/685/777/777i
Revision E o Transfer the PF motor drive to LD roller
2.1.5 Paper Loading Mechanism (ASF Unit)
The Paper loading mechanism is positioned at the printer rear. The Paper loading mechanism loads paper at the ASF unit and feeds paper to the PF roller. This ASF unit was designed newly for this product and consists of LD roller, Pad holder (Paper return plate), ASF Frame, Hopper, and so on. For the major feature of this ASF unit, ASF HP sensor is not used and the single LD roller is built in the ASF unit. Drive sent from the PF motor is always transmitted to the ASF unit side. But, the Change lever and the Clutch mechanism switch ON/OFF the PF motor drive to the LD roller with the motor rotational direction. Drive from the PF motor is transmitted to the ASF unit as described below:
PF Motor pinion gear rotates CW direction Combination Gear 16, 21.6 (CCW) Spur Gear 73.6 (CW) Spur Gear 15 (CCW) Combination Gear 37.6, 44.4 (CW) Change Lever rotates (CW) Spur Gear 23.2 (CCW) Spur Gear 35.2 (CW) (include the clutch mechanism) LD roller (CW).
Following Figure 2-9 shows the PF motor drive transmission path to the LD roller unit built in the ASF unit. The LD roller is assembled on the same shaft that the Spur gear 35.2 is assembled.
Spur Gear 35.2
o Switch the PF motor drive to ASF unit side
Change Lever Spur Gear 23.2
PF Motor pinion gear rotates CCW direction with a specific steps Combination Gear 16, 21.6 (CW) Spur Gear 73.6(CCW) Spur Gear 15(CW) Combination Gear 37.6, 44.4 (CCW) Change Lever rotates (CCW) Release
the Clutch mechanism lock position
Spur Gear 15 Combination Gear 37.6, 44.4
Following Figure 2-7 shows you the switching path for PF motor drive to ASF unit side.
Spur Gear 35.2
Figure 2-8. PF motor drive transmission path
When the PF motor torque is switched to the ASF unit side by the clutch mechanism, the function of the ASF mechanism varies depending on the rotational direction of the PF motor, as shown in the table below.
Change Lever Spur Gear 23.2
Table 2-3. ASF unit function & PF Motor rotational direction
Directions Corresponding Functions · Picks up and loads paper · Release the DE lever & Clutch mechanism Clockwise (*1) Counterclockwise (*1)
Spur Gear 15 Combination Gear 37.6, 44.4
Figure 2-7. Switch the PF motor drive to ASF unit side
(*1): The PF Motor rotational direction = seen from the right side of the printer.
o Clutch Mechanism
Unlike the previous products, this product dose not have a ASF HP sensor. Instead of the ASF HP sensor, Change lever and the Clutch mechanism are used to detect the ASF home position. Following figures describe the mechanism.
Operating Principles
Overview
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EPSON Stylus COLOR 680/685/777/777i
Revision E
NOTE:
The Clutch gear is molded on the back side of the Spur gear 35.2 such as Combination gear.
Spur gear 35.2
Step1
Clutch gear Change Lever
Step2
Tension spring 0.143
Step3
LD roller shaft
Clutch lever
Clutch
Clutch lock tooth
Figure 2-9. Disengage & Clutch mechanism
The Clutch mechanism transmits the PF motor drive to the LD roller shaft only when the Clutch gear rotates CW direction after the Change lever releases the Clutch lever. If the Clutch gear rotates CCW direction, the PF motor drive is not transmitted to the LD roller. This is due to the combination of the shape of the Clutch gear and the Clutch lock tooth such as described on the figure. 1. When the paper is advanced with the PF roller, the Change lever is set on the Clutch lever and the Clutch is pushed down as above Step1's figure. As the result, the Clutch gear (*1) is released from the Cluck lock tooth and the drive from the PF motor is not transmitted to the LD roller shaft. When the PF pinion gear rotates CCW direction in the above Step2's figure, the Change lever moves to the left direction with the CCW rotation of Combination gear 37.6, 44.4. The Clutch turns back to the engagement position by the tension force of the Tension spring 0.143 and the Clutch gear is engaged with the Clutch lock tooth as above Step2's center figure. When the PF pinion gear rotates CW direction in the above Step3's figure, the Change lever moves to the right direction with the CW rotation of the Combination gear 37.6, 44.4. And the drive from the PF motor is transmitted to the LD roller shaft via Clutch gear and Clutch lock tooth. The LD roller shaft rotates about 360 degree and the Change lever push the Clutch lever and the PF motor drive is interrupted. This position is the ASF home position.
ASF frame
Unlike the previous products, The Paper return plate is built in the ASF frame instead of the Paper return lever. The Paper separation pad is also stacked on the plate. It works with the spring force of the Torsion spring 25.7 (mounted in the ASF frame) as following figure.
LD roller
Paper Return Plate Hopper
2.
Torsion spring 25.7
Compression spring 4.80
Figure 2-10. Paper Return Plate
The Paper return plate is set to return the paper to the paper stand-by position in the ASF unit when the ASF unit is in the standby mode. When the paper is fed with the LD roller, the Paper return plate is stored in the ASF frame by the LD roller. Following figures show you the ASF paper loading sequence and the operation of the each mechanism.
3.
4.
o Paper Return Plate (Pad holder)
Operating Principles
Overview
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EPSON Stylus COLOR 680/685/777/777i
Revision E
Step 1
LD roller LD roller shaft When the paper is advanced with the PF roller, Change lever push down the Clutch lever as right figure and the Clutch lock tooth is disengaged from the Clutch gear. As the result, the drive from the PF motor is interrupted and the LD roller dose not rotate. This position is the ASF home position. The Paper return plate is set to avoid that the paper is slipped down from the paper set position. Paper return plate Hopper
Step 2
Change lever
Clutch gear
Printer front side Tension spring 0.143
When the paper is loaded (pick up) from the ASF unit, the Change lever moves to the printer front side with the CCW rotation of the PF motor pinion gear and releases the Clutch lever. As the result, the Clutch turns back to the engagement position by the tension force of the Tension spring 0.143. And the Clutch lock tooth is engaged with the Clutch gear as right figure.
Clutch lever Clutch PF motor pinion gear CW rotation The PF motor pinion gear rotates CW direction and the drive from the PF motor is transmitted to the ASF LD roller shaft through the Clutch lock tooth and the Clutch gear. The ASF hopper release lever rotates with the ASF LD roller and release the ASF Hopper. The ASF hopper is pushed with the Compression spring 4.80 and the paper is picked up with the ASF LD roller. ASF Hopper release lever
Clutch lock tooth
Step 3
PF motor pinion gear CCW rotation Compression spring 4.80
Step 4
The ASF LD roller rotates CW direction moreover and the Paper return plate is stored under the ASF frame. The paper is advanced up to the PF roller. and the ASF LD roller & the clutch rotate to the "Step1" position. The Clutch lever is locked with the Change lever. The drive from the PF motor is interrupted and the drive is transmitted to the PF roller side.
ASF Frame Paper return plate LD roller shaft
PF motor pinion gear CW rotation
ASF hopper release lever
PF motor pinion gear CW rotation
Figure 2-11. ASF Paper Loading Sequence
Operating Principles
Overview
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EPSON Stylus COLOR 680/685/777/777i
Revision E Table 2-4. PF motor rotational direction & Ink System Mechanism
Directions Counterclockwise (*1) Clockwise (*1) Functions · Sets the wiper. · Absorbs ink by the pump unit · Set the CR lock lever · Resets the wiper.
2.1.6 Ink System Mechanism
Ink system mechanism consists of pump unit (include the CR lock lever) and capping mechanism. Ink system mechanism drives the pump unit that presses cap to the printhead and ejects ink from ink cartridge, head cavity and cap to the waste ink pad.
2.1.6.1 Pump Unit & Wiper mechanism
The pump unit is driven by PF motor. PF motor drive is always transmitted to the paper feeding mechanism and pump unit through the following gears. Refer to the Figure 2-13. PF Motor Pinion Gear (CW) Combination Gear 16, 21.6 (CCW) Spur Gear 73.6 (CW)
Spur Gear 15 (CCW) Combination Gear 37.6, 44.4 (CW) Spur Gear 36.8 (CCW) Combination Gear 9.6, 24 (CW) Pump Unit Gear (CCW)
(*1): The PF Motor rotational direction = seen from the right side of the printer. Following figure shows the overview of the pump mechanism operation.
The Pump unit and Wiper mechanism drives according to the PF motor rotational direction, as shown in the right table.
Figure 2-12. Pump mechanism
Capunit Spur Gear 15 Combination Gear 37.6, 44.4
Combination Gear 9.6, 24
Wiper
Pumpunit Pump Unit Gear CR lock lever Spur Gear 36.8
Figure 2-13. PF motor drive transmission path to the Pump unit
Operating Principles
Overview
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EPSON Stylus COLOR 680/685/777/777i
Revision E
2.1.6.2 Capping Mechanism
The capping mechanism covers the printheads with the cap holder to prevent the nozzle from increasing viscosity when the printer is in stand-by mode or when the printer is off. This product has valveless cap system. Air valve function used for the previous models pumps and ejects ink only inside the cap by absorbing ink with the valve open. By opening the Air valve, the negative pressure is decreased and only the ink inside the cap is ejected. (the ink is not absorbed from Ink cartridge or head cavity.) But, valveless cap system, this operation is done out side of the capping area. The CR moves to left side of the Cap assembly and the pump absorbs the ink inside the cap.
Viewed from front side CR unit
Slider cap
Printhead Cap Slide up Waste Ink tube
Figure 2-14. Cap Mechanism
Operating Principles
Overview
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EPSON Stylus COLOR 680/685/777/777i
Revision E
2.2 Electrical Circuit Operating Principles
The electric circuit of the Stylus COLOR 680/777/777i consists of the following boards.
2.2.1 C383 PSB/PSE board
The power supply boards of Stylus COLOR 680/777/777i use a RCC (Ringing Chalk Converter) circuit, which generates +42VDC for drive line and +5VDC for logic line to drive the printer. The application of the output voltage is described below.
o Main board: o Power supply board: o Panel board:
C383 MAIN Board C383 PSB/PSE Board C383 PNL Board
Voltage +42VDC
Table 2-5. Application of the DC Voltages
Application · Motors (CR Motor, PF Motor) · Printhead common voltage · Printhead nozzle selector 42V drive voltage · C383MAIN control circuit logic · Sensor
This section provides operating principles of C383 Board and C383 PSB/PSE Board. Refer to Figure 2-15 for the major connection of the each boards and their roles.
+5VDC
C383 PNL Board Printer Mechanism
C383 MAIN Board
CR Motor PF Motor
AC voltage input from AC inlet first goes through filter circuit that removes high frequency components and is then converted to DC voltage via the rectifier circuit and the smoothing circuit. DC voltage is then lead to the switching circuit and FET Q1 preforms the switching operation. By the switching operation of the primary circuit, +42VDC is generated and stabilized at the secondary circuit. This +42VDC generated by the secondary circuit is converted to +5VDC by the chopping regulator IC of the secondary circuit.
Head Driver Board HP/PE/IC Sensor
+5VDC
+42VDC
C383 PSB/PSE Board
Figure 2-15. Electric Circuit
Operating Principles
Electrical Circuit Operating Principles
34
EPSON Stylus COLOR 680/685/777/777i
1.
+42VDC +5VDC ZD53 +5VDC Line Over Voltage Limitation ZD52,87 +42VDC Line Over Voltage Limitation PSC Sigual from Main board
Revision E
Regardless of the state of the power switch (On or OFF), the voltage is always applied to the primary side of the power supply board from the moment or at the state that AC-plug is plugged in. At this time, F1 plays a role of preventing AC100V from coming into the F1. L1 also prevents high harmonic wave noise generated in the RC circuit filter which consists of C1 from going out, and eliminates the noise from outside