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EPSON
IMPACT DOT MATRIX PRINTER
EPSON LQ-670
SERVICE MANUAL
SEIKO EPSON CORPORATION
4007875
NOTICE
rights reserved. Reproduction of any part of this manual in any form whatsoever All without SEIKO EPSON's express written permission is forbidden. The contents of this manual are subjects to change without notice. efforts have been made to ensure the accuracy of the contents of this manual. All However, should any errors be detected, SEIKO EPSON would greatly appreciate being informed of them. The above notwithstanding SEIKO EPSON 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 purposes only and may be trademarks or registered trademarks of their respective companies.
Copyright © 1997 by SEIKO EPSON CORPORATION Nagano, Japan
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PRECAUTIONS
Precautionary notations throughout the text are categorized relative to 1) personal injury and 2) damage to equipment.
WARNING
CAUTION
Signals a precaution which, if ignored, could result in serious or fatal personal injury. Great caution should be exercised in performing procedures preceded by WARNING 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.
WARNING
1. ALWAYS DISCONNECT THE PRODUCT FROM BOTH 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.
CAUTION
1. REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY EPSON CERTIFIED REPAIR TECHNICIAN. 2. MAKE CERTAIN THAT THE SOURCE VOLTAGE IS THE SAME AS THE RATED VOLTAGE, LISTED ON THE SERIAL NUMBER/RATING PLATE. IF THE EPSON PRODUCT HAS A PRIMARY AC RATING DIFFERENT FROM 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.
iii
PREFACE
This manual describes functions, theory of electrical and mechanical operations, maintenance, and repair of EPSON LQ-670. The instructions and procedures included herein are intended for the experience repair technician, and attention should be given to die precautions on the preceding page. The Chapters are organized as follows:
CHAPTER 1. GENERAL DESCRIPTION
Provides a general product overview, lists specifications, and illustrates the main components of the printer.
CHAPTER 2. OPERATING PRINCIPLES
Describes the theory of printer operation.
CHAPTER 3. DISASSEMBLY AND ASSEMBLY
Includes a step-by-step guide for product disassembly and assembly.
CHAPTER 4. ADJUSTMENT
Includes a step-by-step guide for adjustment.
CHAPTER 5. TROUBLESHOOTING
Provides EPSON-approved techniques for troubleshooting.
CHAPTER 6. MAINTENANCE
Describes preventive maintenance techniques and lists lubricants and adhesives required to service the equipment.
APPENDIX
Describes connector pin assignments, circuit diagrams, circuit board component layout and exploded diagram.
The contents of this manual are subject to change without notice.
iv
REVISION SHEET
Revision Rev. A Issued Data May 28, 1997 Contents First issue
v
TABLE OF CONTENTS
CHAPTER 1. CHAPTER 2. CHAPTER 3. CHAPTER 4. CHAPTER 5. CHAPTER 6. APPENDIX
GENERAL DESCRIPTION OPERATING PRINCIPLES DISASSEMBLY AND ASSEMBLY ADJUSTMENT TROUBLESHOOTING MAINTENANCE
vi
Chapter 1 Product Descriptions
1.1 Specifications .......................................................................................................1-1
1.1.1 Features................................................................................................................................... 1-1
1.2 Hardware Specifications......................................................................................1-3
1.2.1 Printing Method ...................................................................................................................... 1-3 1.2.2 Printing Specifications........................................................................................................... 1-4 1.2.3 Paper Handling Specifications.............................................................................................. 1-5 1.2.4 Paper Specification ................................................................................................................ 1-6 1.2.5 Printable Area ....................................................................................................................... 1-10 1.2.6 Ribbon Cartridge .................................................................................................................. 1-14 1.2.7 Input data buffer ................................................................................................................... 1-14 1.2.8 Electrical Specification ........................................................................................................ 1-14 1.2.9 Reliability............................................................................................................................... 1-14 1.2.10 Environmental Condition................................................................................................... 1-15 1.2.11 Safety Approvals................................................................................................................. 1-15 1.2.12 CE Marking .......................................................................................................................... 1-15 1.2.13 Acoustic Noise.................................................................................................................... 1-15
1.3 Firmware Specification ......................................................................................1-16
1.3.1 Control Codes and Fonts..................................................................................................... 1-16 1.3.2 Interface Specification ......................................................................................................... 1-18 1.3.2.1 Parallel interface (Forward channel) ....................................................................... 1-18 1.3.2.2 Parallel Interface (Reverse channel) ....................................................................... 1-20 1.3.2.3 Optional Interface .................................................................................................... 1-21 1.3.2.4 Interface Selection................................................................................................... 1-21 1.3.2.5 Manual selection...................................................................................................... 1-21 1.3.2.6 Automatic selection ................................................................................................. 1-21 1.3.2.7 Interface state and interface selection..................................................................... 1-21 1.3.3 Prevention Hosts from Data Transfer Timeout.................................................................. 1-21
1.4 Operation.............................................................................................................1-22
1.4.1 Control Panel ........................................................................................................................ 1-22 1.4.1.1 Usual Operation ...................................................................................................... 1-22 1.4.1.2 Switches .................................................................................................................. 1-24 1.4.1.3 Indicators(LED) ....................................................................................................... 1-25 1.4.1.4 Buzzer ..................................................................................................................... 1-26 1.4.2 Default Setting ...................................................................................................................... 1-27 1.4.3 Bi-d Adjustment .................................................................................................................... 1-28 1.4.4 Initialization ........................................................................................................................... 1-29 1.4.5 Errors ..................................................................................................................................... 1-29
1.5 Main Components...............................................................................................1-30
1.5.1 C214 Main Board .................................................................................................................. 1-30 1.5.2 C214PSB Board .................................................................................................................... 1-30 1.5.3 C214 PNL Board.................................................................................................................... 1-31 1.5.4 Printer Mechanism ............................................................................................................... 1-31 1.5.5 Housing ................................................................................................................................. 1-31
Chapter 1 Product Description
1.1 Specifications
This specifications provide characteristics of the serial impact dot matrix printer LQ-670.
1.1.1 Features
LQ-670 is a 24pin serial impact dot matrix printer for the VAR(value added reseller) market. The major features of this printer are; Columns Printing Speed Feeding Method Feeder Paper/Media Fonts Character tables Input buffer Acoustic noise Reliability :106 columns (10cpi) :High speed draft 300cps :Draft 250cps :LQ 83cps at 10cpi :Friction feed (front manual, rear CSF) :Push tractor feed (rear) :Rear push tractor CSF Bin1/Bin2 (Option) Roll paper holder (Option) :Single sheet, Continuous paper, Multi part paper, Envelope, Card, Label and Roll paper. :9LQ & 1 Draft Bitmap and 4 Scarable typefaces :8 Bar code fonts :Standard version 11 tables NLSP version 20 tables :64 Kbytes :55dB(A) (ISO7779 pattern) :Total print volume 6.5 million lines(except print head) :(MTBF) 5000 POH :Print head life 200 million strokes/wire :Ribbon life 2 million characters :Bi-directional parallel interface (IEEE-1284 nibble mode supported) Type B/I/F level 2 (Option) :ESC/P 2 and IBM 2390 Plus emulation :1 original + 4 copies :Font, Condensed, Pause, Tear off, Bin, LF/FF, Load/Eject, Micro Adjust and the default settings :70 lines are available at A4. (Top margin 0 mm setting and Bottom margin 0 mm setting are available)
Ribbon Cartridge Power Switch Control Panel Edge Guide Release lever Printer Cover Print Head Adjust Lever
Interface Control code Copy capability Control panel functions Printable area
Paper Feed Knob Stacker
Paper Guide
Push Tractor
I/F Connector
Figure 1-1. Exterior of LQ-670
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LQ-670 Service Manual
Consumables and optional units Table 1-1. Consumables and Optional Units Name Ribbon cartridge High capacity cut sheet feeder (Bin1) High capacity cut sheet feeder (Bin1) Second bin cut sheet feeder (Bin2) Second bin cut sheet feeder (Bin2) Roll paper holder Serial I/F card 32KB intelligent serial I/F card 32KB intelligent parallel I/F card Local Talk I/F card 32KB IEEE-488 I/F card Coax I/F card Twinax I/F card Ethernet I/F card IEEE-1284 parallel I/F card Multi Protocol Ethernet I/F card Part Number S015016 C806781 (EAI version) C806782 (Non-EAI version) C806791 (EAI version) C806792 (Non-EAI version) #8310 C82305* / C82306* C82307* / C82308* C82310* / C82311* C82312* C82313* C82314* C82315* C82331* C82345* C82346*
Note*): The number represented by an asterisk varies, depending on the country.
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Chapter 1 Product Description
1.2 Hardware Specifications
This section describes hardware specification for the LQ-670.
1.2.1 Printing Method
Printing Method Number of pins Print pin arrangement Print pin diameter Color Print direction : Impact dot matrix : 24 pins : 12x2 staggered : 0.0079 inch (0.20 mm) : Black : Bi-direction with logic seeking
Head Center
Figure 1-2. Pin Configuration
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LQ-670 Service Manual
1.2.2 Printing Specifications
Copy capability :1 original + 4 copies Print speed and printable columns Table 1-2. Print Speed and Printable Columns Print Speed(cps) Normal Copy High speed Draft 10cpi 106 300 200 Draft 10cpi 106 250 167 12cpi 127 300 200 15cpi 159 375 250 Draft condensed 17cpi 181 214 143 20cpi 212 250 167 LQ 10cpi 106 83 70 12cpi 127 100 83 15cpi 159 125 104 LQ condensed 17cpi 181 143 119 20cpi 212 167 139 Note) When the power supply voltage drops to the lower limit, the printer stops printing and then starts printing the rest of that line again but at the slower speed than before. Note) When the head temperature rises to the upper limit, the printer stops printing. When the head temperature falls to the normal level, the printer starts printing again but slower than before. Resolution Table 1-3. Resolution Printing Mode High speed draft Draft Draft condensed LQ 8 pins bit image 24 pins bit image Raster graphics Control code Horizontal density 90dpi 120dpi 240dpi 360dpi 60, 80, 90 or 120dpi 120 or 240dpi 60,90,120 or 180dpi 360dpi 180 or 360dpi Vertical density 180dpi 180dpi 180dpi 180dpi 60dpi 60dpi 180dpi 180dpi 180 or 360dpi Adjacent dot print No No No N0 Yes No Yes No Yes Printing Mode Character Pitch Printable Columns
: ESC/P 2 and IBM 2390 Plus emulation (Refer to control code)
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Chapter 1 Product Description
1.2.3 Paper Handling Specifications
Feeding method Feeder :Friction feed Push tractor feed :Rear push tractor CSF Bin1/Bin2 (Option) Roll paper holder(Option) (front manual, rear CSF) (rear)
Paper path Line Spacing Feed speed Release Lever
:Manual Insertion Front in, front out CSF Rear in, front out Tractor Rear in, front out :1/6 inch or programmable in increments of 1/360 inch :Refer to the table 1-4. :The release lever must be set according to the table 1-5.
Paper thickness lever :The paper thickness lever must be set at the proper position according to the table 1-6.
Table 1-4. Feeding Speed 1/6 inch feed Continuous feed Normal mode 60 msec 0.127MPS(m/sec) 5.0 IPS(inches/sec) Copy mode 70 msec 0.092 MPS(m/sec) 3.6 IPS(inches/sec)
Table 1-5. Release Lever Position Lever Position Friction Paper path/Feeder Manual insertion(front) CSF Bin1 CSF Bin2 Roller paper holder Push tractor feed(rear) Paper/Media Cut sheet(Single sheet& Muti part) Card Cut sheet(Single sheet & Multi part) Envelope, Card Cut sheet(Single sheet) Roll paper Continuous paper(Single sheet & Multi part)
Tractor
Table 1-6. Paper Thickness Lever Position Lever Position 0 1 2 3 4 5 6 Paper thickness (inch) Minimum Maximum 0.0024 0.0047 0.0047 0.0075 0.0075 0.0102 0.0102 0.0126 0.0126 0.0142 0.0142 0.0157 0.0157 0.0205 Paper thickness (mm) Minimum Maximum 0.065 0.12 0.12 0.19 0.19 0.26 0.26 0.32 0.32 0.36 0.36 0.40 0.40 0.52
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LQ-670 Service Manual
1.2.4 Paper Specification
This section describes printable area and types of paper that can be used in this printer. Cut Sheets The following table shows specification for cut sheets. Table 1-7. Cut Sheet (Single sheet, Not Multi Part) Front Entry(Manual Insertion) Rear Entry(CSF bin1) Rear Entry(CSF bin2) Minimum Maximum Minimum Maximum Minimum Maximum 3.6 11.7 3.9 11.7 3.9 11.7 91 297 100 297 100 297 3.5 16.5 3.6 16.5 8.3 16.5 90 420 92 420 210 420 0.0025 0.0055 0.0025 0.0055 0.0025 0.0055 0.065 0.14 0.065 0.14 0.065 0.14 52 90 52 90 52 90 14 24 14 24 14 24 Plain paper, Reclaimed paper, Not curled, not folded, not crumpled.
Width
(inch) (mm) Length (inch) (mm) Thickness(inch) (mm) 2 Weight (g/m ) (lb) Quality
Note): Printing on reclaimed paper is available only under the normal temperature and humidity condition.
Table 1-8. Cut Sheet (Multi Part) Front Entry (Manual Insertion) Minimum Maximum 3.6 11.7 91 297 3.5 16.5(11.7) 90 420(297) ( ):Value of line glue one side of form. 1 original + 4 copies 0.0047 0.015 0.12 0.39 40 58 12 15 Plain paper, Reclaimed paper Not curled, not folded, not crumpled Line glue at the top or one side of form Rear Entry (CSF) Minimum Maximum 3.9 11.7 100 297 3.6 16.5 92 420
Width Length
(inch) (mm) (inch) (mm)
Copies Total thickness (inch) (mm) 2 Weight (g/m ) (one sheet of multi part) (lb) Quality Jointing
1 original + 4 copies 0.0047 0.015 0.12 0.39 40 58 12 15 Plain paper, Reclaimed paper Not curled, not folded, not crumpled Line glue at the top of form
Note):Printing on multi part. Don't use CSF 2nd bin.
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Chapter 1 Product Description
Envelope Table 1-9. Envelope Specification Front Entry (Manual Insertion) Minimum Maximum 6.5 165 3.6 92 9.5 241 4.1 105 0.0063 0.0197 0.16 0.52 The difference of thickness at the printable area is within 0.0098 inch (0.25mm) 45 91 12 24 BOND paper, PLANE paper or AIR MAIL. No glue at a flap, Not curled, not folded, not crumpled Rear Entry (CSF) Minimum Maximum 6.5 165 3.6 92 9.5 241 4.1 105 0.0063 0.0197 0.16 0.52 The difference of thickness at the printable area is within 0.0098 inch (0.25mm) 45 91 12 24 BOND paper, PLANE paper or AIR MAIL. No glue at a flap, Not curled, not folded, not crumpled
Envelope (No.6)
Width (inch) (mm) Length (inch) (mm) Envelope Width (inch) (No.10) (mm) Length (inch) (mm) Total thickness (inch) (mm)
Weight Quality
(g/m ) (lb)
2
Note1): Printing on envelope is available only under normal temperature and humidity conditions. Note2): Set the longer side of envelope horizontally. Note3): Don't use CSF 2nd bin.
Card Table 1-10. Card Specification Front Entry (Manual Insertion) Rear Entry(CSF) Minimum Maximum Minimum Maximum Width (inch) 4.1 5.8 4.1 5.8 (mm) 105 148 105 148 Length (inch) 4.1 5.83 4.1 5.8 (mm) 105 148 105 148 Thickness (inch) 0.0087 0.0087 (mm) 0.22 0.22 2 Weight (g/m ) 192 192 (lb) 51 51 Quality Plain paper, Reclaimed paper Plain paper, Reclaimed paper Not curled, not folded, not crumpled Not curled, not folded, not crumpled Note1): Printing card is available only under normal temperature and humidity conditions. Note2): Don't use CSF 2nd bin.
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LQ-670 Service Manual
Continuous paper (Single sheet and Multi part) Table 1-11. Continuous Paper (Single Sheet and Multi Part) Rear Entry (Tractor) Width Length(one page) Copies Total thickness (inch) (mm) (inch) (mm) Minimum 4 101.6 4 101.6 1 original + 4 copies 0.0025 0.065 52 14 40 12 Plain paper, Reclaimed paper Carbonless multi part paper Point glue or paper staple(both side) Maximum 12 304.8 22 558.8 0.015 0.39 82 22 58 15
(inch) (mm) 2 Weight (g/m ) (not multi part) (lb) 2 Weight (g/m ) (one sheet of multi part) (lb) Quality Jointing Continuous paper with Labels
Table 1-12. Continuous Paper with Labels Rear Entry (Tractor) Minimum Label size Base sheet width Base sheet length (one page) Base sheet Thickness Total thickness Label weight See the figure below. (inch) (mm) (inch) (mm) (inch) (mm) (inch) (g/m ) (lb)
2
Maximum 12 304.8 22 558.8 0.0035 0.09 0.0075 0.19
4 101.6 4 101.6 0.0028 0.07 0.0063 0.16
68 17 Quality A VERY CONTINUOUS FORM LABELS, A VERY MINI-LINE LABELS or the same quality labels Note): Printing on label is available only under the normal temperature and humidity conditions. Note): The base sheet of labels must be continuous paper.
2.5 inch (63.5mm) min.
15/16 inch (23.8mm) min.
Label
R 0.1 inch(2.5mm) min.
Figure 1-3. Label Size
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Chapter 1 Product Description
Roll paper Table 1-13. Roll Paper Specification Rear Entry (Roll paper holder) Minimum Maximum 8.5 216 ----0.0028 0.0035 0.07 0.09 52 82 14 22 Plain paper, Reclaimed paper. Not curled, not folded, not crumpled.
Width Length Thickness Weight Quality
(inch) (mm) (inch) (mm) (inch) (mm) 2 (g/m ) (lb)
Rev. A
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LQ-670 Service Manual
1.2.5 Printable Area
Cut sheets
Printable Area
Figure 1-4. Printable Area for Cut Sheet
Table 1-14. Printable Area for Cut Sheet PW PL LM RM TM BM (Width) (Length) (Left margin) (Right margin) (Top margin) (Bottom margin) Single sheet (Refer to section 1.2.4) (Refer to section 1.2.4) 3 mm or more(PW<=297mm) 3 mm or more(PW<=297mm) 0.0mm or more 0.0mm or more Multi part (Refer to section 1.2.4) (Refer to section 1.2.4) 3 mm or more(PW<=297mm) 3 mm or more(PW<=297mm) 0.0mm or more 0.0mm or more
1-10
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Chapter 1 Product Description
Envelope and card
LM RM
TM
Printable Area
BM
Figure 1-5. Printable Area for Envelope
Printable Area
Figure 1-6. Printable Area for Card
Table 1-15. Printable Area for Envelope and Card PW PL LM RM TM BM (Width) (Length) (Left margin) (Right margin) (Top margin) (Bottom margin) Envelope (Refer to section 1.2.4) (Refer to section 1.2.4) 3 mm or more 3 mm or more 0.0mm or more *1 0.0mm or more Card (Refer to section 1.2.4) (Refer to section 1.2.4) 3 mm or more 3 mm or more 0.0mm or more *1 0.0mm or more
Note *1): When loading the paper from CSF, TM(Top margin) is 4.2 mm or more.
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LQ-670 Service Manual
Continuous paper
Perforation
Printable Area
Perforation
Figure 1-7. Printable Area for Continuous Paper
Table 1-16. Printable Area for Continuous Paper PW PL LM RM TM BM (Width) (Length) (Left margin) (Right margin) (Top margin) (Bottom margin) Continuous paper (Refer to section 1.2.4) (Refer to section 1.2.4) 13mm or more 13mm or more 4.2mm or more 4.2mm or more
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Chapter 1 Product Description
Roll paper
PW LM BM TM
Printable Area
BM
Figure 1-8. Printable Area for Roll Paper
Table 1-17. Printable Area for Roll Paper PW PL LM RM TM BM (Width) (Length) (Left margin) (Right margin) (Top margin) (Bottom margin) Continuous paper (Refer to section 1.2.4) (Refer to section1.2.4) 3mm or more 3mm or more 0.0mm or more 0.0mm or more
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LQ-670 Service Manual
1.2.6 Ribbon Cartridge
Type Color Ribbon life Dimensions : Fabric : Black : 2 million characters (LQ 10cpi, 48 dots/character) :120.5mm(W) x 101.5mm(D) x 23.5mm(H)
1.2.7 Input data buffer
0 Kbyte or 64 Kbyte*
Note*): Depends on default settings.
1.2.8 Electrical Specification
120V version Rated voltage Input voltage range Rated frequency range Input frequency range Rated current Power consumption Insulation resistance Dielectric strength 230 V version Rated voltage Input voltage range Rated frequency range Input frequency range Rated current Power consumption Insulation resistance Dielectric strength : AC220 to 240V : AC198 to 264V : 50 to 60Hz : 49.5 to 60.5Hz : 0.4A (max.1.1A) : Approx.30W (ISO/IEC10561 Letter pattern) Energy Star Compliant : 10M min. (between AC line and chassis, DC 500V) : AC1500 Vrms. 1min.(between AC line and chassis)
: AC120V : AC103.5 to 132V : 50 to 60 Hz : 49.5 to 60.5 Hz : 0.7A(max.2.2A) : Approx.30W (ISO/IEC10561 Letter pattern) Energy Star Compliant : 10 M min.(between AC line and chassis, DC 500V) : AC1000 Vrms. 1min.or AC1200 Vrms. 1 sec.(between AC line and chassis)
1.2.9 Reliability
Total print volume (MTBF) Print head life Ribbon life : 6.5 million lines (except print head) : 5000 POH : 200 million strokes/wire : 2 million characters
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Chapter 1 Product Description
1.2.10 Environmental Condition
Temperature Operating Non-operating Humidity Operating Non-operating Resistance to shock Operating Non-operating Resistance to vibration Operating Non-operating : 5 to 35 °C(without condensation) : 15 to 25 °C (without condensation and during printing on multi part paper, envelope, card or label) : -30 to 60 °C : 10 to 80% RH (without condensation) : 30 to 60% RH (without condensation and during printing on multi part paper, envelope, card or label) : 0 to 85% RH (without condensation)
: 1G, within 1ms : 2G, within 2ms
: 0.25G,10 to 55 Hz : 0.50G,10 to 55 Hz
1.2.11 Safety Approvals
120V version Safety standards EMI 230V version Safety standards EMI : UL1950 with D3 CSA C22.2 No.950 with D3 : FCC part15 subpart B class B : CSA C108.8 class B
: EN60950(VDE, NEMKO) : EN55022(CISPR pub.22) class B : AS/NZS 3548 class B
1.2.12 CE Marking
230V version Low Voltage Directive 73/23/EEC : EN60950 EMC Directive 89/336/EEC : EN55022 class B : EN61000-3-2 : EN61000-3-3 : EN50082-1 : IEC801-2 : IEC801-3 : IEC801-4
1.2.13 Acoustic Noise
Level : Approx. 55 dB(A) (ISO 7779 pattern)
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LQ-670 Service Manual
1.3 Firmware Specification
This section provides detailed information about LQ-670 firmware.
1.3.1 Control Codes and Fonts
Control codes: Typefaces :ESC/P 2 and IBM 2390 Plus emulation :Bit map font EPSON Draft 10CPI, 12CPI, 15CPI EPSON Roman 10CPI, 12CPI, 15CPI, Proportional EPSON Sans Serif 10CPI, 12CPI, 15CPI, Proportional EPSON Courier 10CPI, 12CPI, 15CPI EPSON Prestige 10CPI, 12CPI EPSON Script 10CPI EPSON OCR-B 10CPI EPSON Orator 10CPI EPSON Orator-S 10CPI EPSON Script C Proportional EPSON Draft(Arabic) 10CPI, 12CPI EPSON Draft(Hebrew) 10CPI, 12CPI EPSON Miriam 10CPI, Proportional EPSON David 10CPI, Proportional EPSON Naskh 10CPI, Proportional EPSON Kufi 10CPI, Proportional :Scalable font EPSON Roman EPSON Sans Serif EPSON Roman T EPSON Sans Serif H :Bar code Ean-13 EAN-8 Interleaved 2 of 5 UPC-A UPC-E Code 39 Code 128 POSTNET International character sets :14 countries and legal U.S.A, France, Germany, U.K., Denmark 1, Sweden, Italy, Spain 1, Japan, Norway, Denmark 2, Spain 2, Latin America, Korea, Legal
10.5pt., 8pt.-32pt.(every 2pt.) 10.5pt., 8pt.-32pt.(every 2pt.) 10.5pt., 8pt.-32pt.(every 2pt.) 10.5pt., 8pt.-32pt.(every 2pt.)
Note)The international and legal characters are these 12 codes; 23H, 24H, 5BH, 5CH, 5DH. 5EH, 60H, 7BH, 7CH, 7DH, 7EH.
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Chapter 1 Product Description
Character tables
:The standard version has 11 character tables and the NLSP version has 20 charater tables, as shown in the following table.
Table 1-18. Character Tables Standard version Character table Italic table PC437(US Standard Europe) PC850(Multilingual) PC860(Portuguese) PC861(Icelandic) PC863(Canadian-French) PC865(Nordic) Abicomp BRASCII Roman 8 ISO Latin 1 Italic table PC437(US, Standard Europe) PC850(Multilingual) PC860(Portuguese) PC861(Icelandic) PC865(Nordic) Bitmap font EPSON Draft EPSON Roman EPSON Sans Serif EPSON Courier EPSON Prestige EPSON Script EPSON OCR-B EPSON Orator EPSON Orator-S EPSON Script C EPSON Draft EPSON Roman EPSON Sans Serif EPSON Courier EPSON Prestige EPSON Script EPSON OCR-B EPSON Orator EPSON Orator-S EPSON Script C EPSON Draft EPSON Roman EPSON Draft EPSON Roman EPSON Sans Serif EPSON Courier EPSON Prestige EPSON Script Scalable font EPSON Roman EPSON Sans Serif EPSON Roman T EPSON Sans Serif H
NLSP version
EPSON Roman EPSON Sans Serif EPSON Roman T EPSON Sans Serif H
PC864(Arabic) PC437 Greek PC852(East Europe) PC853(Turkish) PC855(Cyrillic) PC857(Turkish) PC866(Russian) PC869(Greek) MAZOWIA(Poland) Code MJK(CSFR) ISO 8859-7 (Latin/Greek) ISO Latin 1T(Turkish) Bulgaria(Bulgarian) Estonia(Estonia) PC744(LST 1283:1993) ISO 8859-2 PC866 LAT.(Latvian) PCAPTEC(Arabic) PC708(Arabic) PC720(Arabic) PCAR864(Arabic) Hebrew7 *1 Hebrew8 *1 PC862(Hebrew) *1 Note *1) Note)
(Not supported) (Not supported)
EPSON Draft(Arabic) EPSON Naskh EPSON Kufi EPSON Draft(Hebrew) EPSON Miriam EPSON David
(Not supported)
(Not supported)
These fonts are not selected in the default setting mode. ESC R command is effective on the character tables with bold weight.
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1.3.2 Interface Specification
This printer provides bi-directional 8-bit parallel interface and Type-B optional interface slot as standard.
1.3.2.1 Parallel interface (Forward channel)
[Transmission mode] [Adaptable connector] [Synchronization] [Handshaking] [Signal level] : 8 bit parallel, IEEE-1284 compatibility mode : 57-30360 (Amphenol) or equivalent : /STROBE pulse : BUSY and /ACKNLG signals : TTL compatible (IEEE-1284 level 1 device)
Table 1-19. Connector Pin Assignment and Signals Pin No. Signal Name Return GND Pin 19 2027 In/Out * Function description
1 29
/STROBE DATA18
In In
10
/ACKNLG
28
Out
11
BUSY
29
Out
12
PE
28
Out
13 14 31 32
SLCT /AFXT /INIT /ERROR
28 30 30 29
Out In In Out
36 18 35 17 16,33 19-30 15,34
/SLIN Logic H +5V Chassis GND NC
30 ------------
In Out Out -------
Stroke pulse. Input data is latched at falling edge of the signal. Each signal represents information of parallel data from 1 bit to 8 bit. The data is 1 at "HIGH" and is 0 at "LOW". This signal (negative pulse) indicates that the printer has received data and is ready to accept next one. The pulse width is 5µs. This signal's "HIGH" level indicates that the printer is not ready to accept data. On the other hand, "LOW" means the printer can take data. (Refer to the next page for conditions when this signal becomes high level) This signal's "HIGH" level indicates that the printer is in a state of paper-out error.(Refer to the next page for the condition when this signal becomes high level.) Always at high level when the printer is powered on. Not used. This signal's negative pulse initializes printer. This signal's low level means the printer is in a state of error. (Refer to the next page for conditions when the signal becomes low level) Not used. This line is pulled up to +5V through 3.9 k resistor. This line is pulled up to +5V through 1.0 k resistor. Chassis GND. Signal GND. Not connected.
Note)*In/Out shows the direction of signal flow from the printer's point of view. Note)If the signal is "LOW" and active state, the signal is marked with "/".
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BUSY signal is active (high level) under the following conditions. In the process of receiving data. In the condition of being input buffer full In the condition of being /INIT signal active(low level) During hardware initialization In the condition of being /ERROR or PE signal active(low level, high level, respectively) In the self test mode In the adjustment mode In the default-setting mode /ERROR signal is active(low level) under the following conditions. In the condition of the release lever error In the condition of the paper-out error In the condition of the paper-jam error PE signal is active(high level) under the following condition. In the condition of paper-out error
Note)It becomes possible to input the data without outside equipment by setting appropriate connecting.
Figure 1-9. Data Transmission Timing
Table 1-20. Maximum and Minimum Timings for Data Transmission Parameter tsetup thold tstb tready tbusy treply tack tnbusyt tnext ttout* ttin** Minimum 500 nsec 500 nsec 500 nsec 0 ----500 nsec 0 0 ----Maximum --------500 nsec --10 us ----120 nsec 200 nsec
Note) * Rise and fall time of output signals. ** Rise and fall time of input signals.
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1.3.2.2 Parallel Interface (Reverse channel)
[Transmission mode] [Adaptable connector] [Synchronization] [Handshaking] [Signal Level] [Data transmission timing] [Extensibility request] : IEEE 1284 nibble mode : 57-30360(Amphenol) or equivalent : /STROBE pulse : BUSY and /ACKNLG signals : IEEE-1284 level 1 device TTL compatible : Refer to the IEEE-1284 specification : The printer responds to the extensibility request in the affirmative, when the request is 00H or 04H, which mean; 00H:Request nibble mode of reverse channel transfer 04H:Request device ID in nibble mode of reverse channel transfer. : [00H] [3AH] MFG: EPSON; CMD:ESCPL2,PRPXL24, BDC; MDL;LQ-670; CLS:PRINTER;
[Device ID]
Table 1-21. Connector Pin Assignment and Signals Pin No. 1 29 10 11 12 13 14 31 32 36 18 35 17 16,33, 19-30 15,34 Signal Name Return GND Pin 19 2027 28 29 28 28 30 30 29 30 ----------In/Out* Function description
HostClk DATA18 PtrClk PtrBusy, DataBit-3,7 AckDataReq, DataBit-2, 6 Xflag, DataBit-1, 5 HostBusy /INIT /Data Avail, DataBit-0, 4 1284-Active Logic-H +5V Chassis GND NC
In In Out Out Out Out In In Out In Out Out -------
Host clock signal Parallel input data to the printer. 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 bit1 or 5. Host busy signal. Not used. Data available signal and reverse channel transfer data bit0 or 4. 1284 active signal. A high signal indicates that all other signals sourced by the peripheral are in a valid state. This line is pulled up to +5V through 1.0 k resistor. Chassis GND. Signal GND. Not connected.
Note*): In/Out refers to the direction of signal flow/from the printer's point of view.
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1.3.2.3 Optional Interface
Type-B optional interface cards are available. Table 1-22. Optional Interface Reply message Main-Type Product-Name Emulation-Type Entity-Type ESC/P2 MT24p,PW106cl10cpi,PRG(W0xxxx)rev LQ-670 ESCPL2-00 EPSONLQ2 IBM 2390 Plus MT24p,PW106c110cpi,PRG(W0xxxx)rev LQ-670 PRPXL24-01 EPSONPRPXL24
1.3.2.4 Interface Selection
The printer has 2 interfaces; the parallel interface and Type B optional interface. These interfaces are selected manually by Default setting or selected automatically.
1.3.2.5 Manual selection
Out of 2 interfaces can be selected by Default Setting.
1.3.2.6 Automatic selection
The automatic interface selection is enabled by Default Setting. In this automatic interface selection mode, the printer is initialized to the idle state scanning which interface receives data when it is powered on. Then the interface that receives data first is selected. When the host stops data transfer and the printer is in stand-by state for the seconds specified by Default Setting, the printer is returned to the idle state. As long as the host sends data or the printer interface is busy state, the selected interface is let as it is.
1.3.2.7 Interface state and interface selection
When the parallel interface is not selected, the interface gets into a busy state. When the Type-B serial interface card is installed and it is not selected, the interface sends XOFF and sets the DTR signal MARK. When the optional interface is not selected, the printer sends disable commands to the optional interface. When the printer is initialized or returned to the idle state, the parallel interface gets into a ready state, the serial interface sends XON and sets the DTR SPACE and the printer sends enable commands to the optional interface. Caution that the interrupt signal such as a /INIT signal on the parallel interface is not effective while that interface is not selected.
1.3.3 Prevention Hosts from Data Transfer Timeout
Generally, hosts abandons data transfer to peripherals when a peripheral is in busy state for dozens of seconds continuously. To prevent hosts from this kind of timeout, the printer receives data very slowly, several bytes per minute, even if the printer is in busy state. This slowdown is started when the rest of the input buffer becomes several hundreds of bytes. At last, when the input buffer is full, the printer is in busy state continuously.
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1.4 Operation
1.4.1 Control Panel
There are 7 switches and 8 LEDs on the panel as shown below.
Operate
Paper Out Pause
Micro Adjust
3sec Load/Eject
LF/FF Draft Roman
Sans Serif Courier
Prestige
Script Font
Others
Condensed
Tear Off/Bin
Tear Off Bin 1 Bin 2 Card
LED Off LED On LED Blinks
Figure 1-10. Control Panel
1.4.1.1 Usual Operation
Operate This switch turns the printer on and off. It is the secondary switch. Pause This switch alternates printer activity between printing and non-printing. Holding it down over 3 seconds when the printer is in the stand by state, the Micro Adjust function is enabled. Pressing it again, this function is disabled. Load/Eject Pressing it loads cut sheet or continuous paper when the printer is out of paper. Pressing it ejects cut sheet to the stacker or continuous paper to the paper park. LF/FF Pressing it shortly executes line feed. Holding it down for a few seconds executes form feed when continuous paper is used, or ejects cut sheet to the stacker when cut sheet is used. Tear Off When continuous paper is used, pressing it moves a page to the Tear-off position. And pressing it again moves a next page to the TOF position.
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Bin Pressing it selects CSF bin number or the Card mode* when cut sheet is used. Note*) Card mode is for using post card or envelope. Font Pressing it selects one of following fonts. Draft, Roman, Sans serif, Courier, Prestige, Script and Others *. Note*) Others means the font selected in the Default Setting Mode. Condensed Pressing it alternates condensed and non-condensed mode. Micro Adjust Micro Adjust / switches is effective when the Micro Adjust function is enabled by Pause switch. Pressing the Micro Adjust / switches execute micro feed backward and forward by 1/80 inch. The TOF adjustment is enabled in the TOF position after loading, and the Tear-off adjustment is enabled in the Tear-off position.
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1.4.1.2 Switches
Operation in normal mode In normal mode, pressing panel switches executes following function. Table 1-23. Operation in Normal Mode Switch Operate Pause Load/Eject LF/FF Function Turn the printer on and off. Alternates printing and no-printing status. Enables Micro Adjust function, holding it down for 3 seconds. Loads or ejects the paper. Executes micro feed forward, when this function is enabled. Executes line feed, pressing it shortly. Executes form feed, holding it down for a few seconds. Executes micro feed backward, when this function is enabled. Advances continuos paper to the Tear-off position. Selects CSF bin ½ or Card mode. Selects font. Alternates condensed mode and non-condensed mode.
Tear Off/Bin Font Condensed
Operation at power on Turning the printer on while pressing panel switches executes the function shown below. Table 1-24. Operation in Power On Switch Load/Eject LF/FF Font Load/Eject & LF/FF Condensed &Tear Off/Bin Pause Font & Condensed The others Function LQ self test Draft self test Default setting Data dump Clear EEPROM Bi-d adjustment Quiet mode Not available
Operation in default setting mode The switches are used in default setting mode as follows: Table 1-25. Operation at Default Setting Mode Switch Font Tear Off/ Bin The others Function Selects the Menu Changes the setting Not available
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1.4.1.3 Indicators(LED)
This printer displays present conditions and errors on the indicators. Indication in normal mode Table 1-26. LED Indicators LED Printer Status Pause Paper out error Paper jam error Paper eject error Head hot Micro Adjust Tear off Bin selection Condensed Font selection Fatal error Pause *1 On On On On Blink Blink --------Blink Paper Out *2 --On Blink Blink ------------Blink Tear Off/Bin ------------*3 *3 ----Blink Condensed ----------------On --Blink Font ------------------*4 Blink
*1 Pause (Orange) It is on when the printer is paused, and it is off when the printer is not paused. It blinks when the Micro Adjust function is enabled or the printer is in the head hot status. *2 Paper Out (Red) It is on when the printer is in the paper out status, and it is off when the printer is out of this status. *3Tear Off/Bin (Green) 2 LEDs display the status of CSF bin selection when cut sheet is used. Only a right LED is on when Bin1 is selected, only a left LED is on when Bin2 is selected, and both LEDs are on when the Card mode is selected. Both LEDs blinks when continuous paper is in the Tear-off position and both LEDs are off when continuous paper is out of the Tear-off position. *4Font (Green) The status of Font selection is displayed by 3 Font LEDs.
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1.4.1.4 Buzzer
When the printer detects errors, it displays errors on the LEDs and also the buzzer beeps as warning sign. Table 1-27. Buzzer Warning sign Paper out error Paper jam error Paper eject error Release lever operation error Illegal panel operation Beeper sounds rrr qqqqq rrr qqqqq r
Note) r : Beeper sounds approx. 100ms and interval is approx.100ms. q : Beeper sounds approx. 500ms and interval is approx.100ms.
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1.4.2 Default Setting
Setting Method Several printer settings loaded at each power-on can be changed in this operation. The method is described in the guidance sheets (language selection sheet and printer setting sheet) which are printed out at first in the setting mode if desired. User is requested to operate 2 switches watching 6 LEDs on the control panel. The lights turn on and off, and blink in one of the patterns described in the guidance sheets. This setting mode uses the menus of 3 types as follows; Language menu: : List of the languages to be used for the printer setting sheet Main menu : List of items to be set(ex. "CG table", "Auto line feed") Submenus : Lists of value/setting of the each item(ex. "PC437", "ON") 1) Language selection sheet is printed out. The sheet describes how to select a language among the five; English, French, German, Italian and Spanish in all languages. 2) Font LEDs indicate the top item on "Language menu". 3) The selection can be changed with Font switch. 4) When Tear off/Bin switch is pressed, the setting sheet is printed out in the language. 5) Font LEDs indicate the top item on "main menu". 6) The selection can be changed with Font switch. 7) When Tear off/Bin switch is pressed, printer changes the indication to the "submenu" of the selected item. 8) Condensed & Tear off/Bin LEDs indicate the current setting/value on the submenu. 9) The setting/value can be changed with Tear off/Bin switch. 10) When Tear off/Bin switch is pressed, printer memorizes the last setting/value, and changes its indication to the main menu.(Back to (5)). 11) The other items can be changed in the same manner. Setting Mode (Factory setting) Table 1-28. Setting Menu Item Character table Setting/Value Standard version: Italic, PC 437, PC850, PC860, PC863, PC865, PC861, BRASCII, Abicomp, ISO Latin1, Roman8 NLSP version: Italic, PC437, PC437 Greek, PC850, PC852, PC853, PC855, PC857, PC864, PC866, PC869, ISO Latin 1T, ISO8859-7 MAZOWIA, Code MJK, Bulgaria, Estonia, PC774, ISO 8859-2, PC866LAT. PCAPTEC*5, PC708*5, PC720*5, PCAR864*5, PC860*5, PC861*5, PC865*5 Italic U.S.A, Italic France, Italic Germany, Italic U.K., Italic Denmark, Italic Sweden, Italic Italy, Italic Spain OCR-B, Orator, Orator-S, Script C, Roman T, Sans serif H 3 inch, 3.5 inch, 4 inch, 5.5 inch, 6 inch, 7 inch, 8 inch, 8.5 inch,11 inch, 70/6 inch, 12 inch, 14 inch, 17 inch On, Off Auto, Bi-d, Uni-d ESC/P2, IBM2390 Plus Auto, Parallel I/F, Option I/F 10sec., 30sec. On, off On, Off, Others On, Off On, Off On, Off On, Off On, Off On, Off
International character set for Italic table *4 Font *1 Page Length for tractor High speed draft Print Direction Software I/f mode Auto I/F wait time Input buffer Skip over perforation Auto tear off Auto line feed Auto CR (IBM 2390 Plus)*2 A.G.M (IBM 2390 Plus)*2 0 slash Buzzer * Refer to the next page for Notes.
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Note*1): One of these fonts selected in the default setting is corresponding to others(=other fonts) on the control panel. Following fonts are not selected in the default setting mode. Draft, Roman, Sans serif, Courier, Prestige and Script Note*2) : These settings are effective when IBM 2390 Plus emulation is selected. Note*3): Settings with bold weight mean the standard factory settings. Note*4): "Italic Denmark" is as same as "Italic Denmark 1", and "Italic Spain" is as same as "Italic Spain 1". Note*5): Hebrew7, Hebrew8, PC862 are not selected in the default setting mode.
1.4.3 Bi-d Adjustment
Bi-d adjustment can be adjusted by users. By using this mode, the gap of lines; line for right printing direction and line for left printing direction can be adjusted. The setting value is stored in the EEPROM of the main control board and retained even after the power is turned off. Bi-d adjustment method is as follows. 1) Turning the printer on while pressing Pause switch. The guide to adjust Bi-d alignment in this mode is printed and first alignment pattern is printed. 2) Select most closely aligned number by pressing LF/FF() and Load/Eject() switches. Font LEDs show the pattern number which is selected at that time. The selection is advanced one by one as the switch is pressed, and the combination of On/Off/ Blink of those three LEDs is also changed by according to the selection. 3) Fix the selected number by pressing Font switch. Selected number is fixed and next alignment pattern is printed. 4) Repeat 2)-3) until finishing Bi-d. adjustment for LQ mode. Following adjustment is executed. 1. Bi-d adjustment for draft mode 2. Bi-d adjustment for draft copy mode 3. Bi-d adjustment for LQ mode 5) Turn the printer off.
Note) The setting values are stored into non-volatile memory and retained even if EEPROM is reset.
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1.4.4 Initialization
Power-On initialization The initialization of this level is activated by power-on or cold reset command(remote RS command). This initialization is; to initialize the printer mechanism. to execute Operator initialization. Operator Initialization The initialization of this level is activated by /INIT signal(negative pulse). This initialization is; to clear the all buffers of data. to cancel the download character definition. to make the printer stand-by state, if no errors occur. to execute Software initialization. Software Initialization The initialization of this level is activated by the control code ESC @. This initialization is; to clear the unprinted data. to make the printer's setting defaults.
1.4.5 Errors
This printer goes to the error state when the following condition is detected, and changes ERROR signal to "LOW" and "BUSY" signal to "HIGH" , and stops taking data. Also, the printer goes unprintable condition automatically. Fatal errors is detected. Paper out error or paper jam error is detected. Paper eject error is detected. When the present paper path and the position of release lever do not match. (Release lever operation error) Fatal errors Carriage control error, Power supply voltage error and CG access error. Paper out error When printer fails to load a sheet, it goes paper out error. Paper eject error When printer fails to eject a sheet, it goes paper eject error. Paper jam error When printer fails to feed a sheet, it goes paper jam error.
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1.5 Main Components
This printer consists of the following components. C214MAIN Board C214 PSB/PSE Board C214 PNL Board Printer Mechanism(M-5060) Housing
1.5.1 C214 Main Board
This main board consists of 16bitCPU TMP96C041AF (IC11) which is driven by 17.20MHz clock drive frequency, Gate array E05B42(IC10), 2/4M Flash-EPROM(IC7), or 8M PROM(IC8), 4/8/32M MROM (IC4) for CG, 8M PROM (IC5), 1MPSRAM (IC6), EEPROM 93C46(IC9), Reset IC RST592D (C12), PF Motor drive circuit, CR motor drive circuit and print head drive circuit.
Gate Array(IC10) Reset IC(IC12) EEPROM(IC9) CPU(IC11) Print Head Driver
PSRAM(IC5) PROM(IC8) PROM(IC5) Flash-EPROM(IC7)
PF Motor Driver IC CR Motor Driver IC
Figure 1-11. C214 Main Board
1.5.2 C214PSB Board
This board consists of fuse, filter circuit, primary side diode bridge, switching FET, transformer and chopper IC for +5V generation. Also, the secondary switch is used for power and is operated by On/Off of the power switch on the operation panel of the printer.
Fuse Filter Circuit SwitchingFET Chopper IC for +5V generation
Diode Bridge
Transformaer
Figure 1-12. C214 PSB Board
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1.5.3 C214 PNL Board
This panel board consists of one switch as power switch, 6 non lock type switches and 8 LEDs.
1.5.4 Printer Mechanism
This unit consists of carriage mechanism, paper feed mechanism, cut sheet/transformer change over mechanism, platen gap adjustment mechanism and print head.
1.5.5 Housing
The housing of this printer consists of upper housing, printer cover, front sheet guide, rear sheet guide and lower housing.
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Chapter 2 Operating Principles
2.1 Printer Mechanism Operation..............................................................................2-1
2.1.1 Printing Mechanism ............................................................................................................... 2-1 2.1.2 Carriage Mechanism .............................................................................................................. 2-3 2.1.3 Ribbon Advance Mechanism................................................................................................. 2-5 2.1.4 Paper Advance Mechanism ................................................................................................... 2-6 2.1.4.1 Paper Advance Mechanism ...................................................................................... 2-6 2.1.4.2 Paper Advance Detector Mechanism........................................................................ 2-7 2.1.4.3 Release Lever Mechanism........................................................................................ 2-9 2.1.5 Platen Gap Adjustment ........................................................................................................ 2-10
2.2 Power Supply Operation ....................................................................................2-11
2.2.1 Power Supply Circuit ........................................................................................................... 2-11 2.2.1.1 Power Supply Overview............................................................................................2-11 2.2.1.2 Power Supply Circuit Operation .............................................................................. 2-12 2.2.2 Control Circuit ...................................................................................................................... 2-13 2.2.2.1 Operating Principles of the Control Circuit .............................................................. 2-13 2.2.2.2 EEPROM Control Circuit ......................................................................................... 2-14 2.2.2.3 System Reset Circuit............................................................................................... 2-14 2.2.2.4 Power Off Detector Circuit....................................................................................... 2-15 2.2.2.5 Print Head Driver Circuit.......................................................................................... 2-15 2.2.2.6 CR Motor Driver Circuit ........................................................................................... 2-16 2.2.2.7 PF Motor Driver Circuit............................................................................................ 2-16 2.2.2.8 Operation Panel Control Circuit............................................................................... 2-17 2.2.2.9 Interface(I/F) Circuit................................................................................................. 2-18 2.2.2.10 Head Temperature Detector Circuit....................................................................... 2-18 2.2.2.11 Head Drive Voltage Measurement Circuit ............................................................. 2-18 2.2.2.12 Rear and Front Paper End Detector Circuit .......................................................... 2-18 2.2.2.13 Paper Width Detector Circuit................................................................................. 2-18 2.2.2.14 Carriage Home Position (HP) Detector Circuit ...................................................... 2-18 2.2.2.15 Release Lever Detector Circuit ............................................................................. 2-18 2.2.2.16 Adjust Lever Detector Circuit................................................................................. 2-18
LQ-670 Service Manual
2.1 Printer Mechanism Operation
This section describes the printer mechanism(M-5060) and explains how it works.
2.1.1 Printing Mechanism
The printing mechanism of this printer is composed of head, ink ribbon and ribbon mask. The print head is an 24-pin(12pins X 2) head for impact dot printing.(Refer to Chapter 1) Each wire has its own drive coil.
Actuating Plate Actuating Spring Stopper Wire Resetting Spring Head Driving Coil Iron Core Paper Wire Ink Ribbon Ribbon Mask
Platen
Figure 2-1.Print Head Operation Principles
1. A drive signal, transmitted from the control circuit to the prinhead drive circuit, is converted to the proper printhead driving voltage, which energizes a corresponding coil. The energized coil then causes the iron core to become magnetized. 2. The magnetic force draws the actuating plate toward the core, and the dot wire, which is connected to the core, rushes toward the platen. 3. When the dot wire impacts the platen, pressing against the ribbon and paper, it prints a dot. 4. When the driving voltage stops energizing the coil, the magnetic force vanishes from the iron core. The actuating plate returns to its original position (the position before coil was energized) with spring action. The dot wire also returns to its original position. The mechanism is equipped with a built-in thermistor for head temperature detection. The temperature detected by the thermistor is converted to an electric signal and fed back to the control circuit. In order to keep the same print quality, the drive mode of the print head is changed over according to the paper type and head temperature. This drive mode minimizes the degradation or damage to the dot wires in the print head, which is caused by temperature rise of the print head from continuous printing, and also keeps print quality when the surrounding temperature is extremely low. (Refer to section 1.2.2 for the changes of print speed by the temperature of the head) The next page shows print head specification.
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Table 2-1. Print Head Specification Category Print Method Number of pin wires Wire diameter Print head life Weight Coil direct current resistance Response Frequency Drive Voltage Drive Condition Specification Impact dot matrix 24-pin (12X2) 0.20mm 200 million strokes/wire 115 ± 12g 39.3 ± 2.7 (at 25 °C) Normal Mode : 1500Hz Buzzer : 1.5KHz 42 ± 3V · Normal Drive · Thick paper (using multipart or thick papers) · Buzzer function Temperature : 555 °C Humidity : 1085% Constant voltage drive method
Environmental condition Print drive method
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2.1.2 Carriage Mechanism
Carriage Mechanism consists of the carriage movement mechanism and platen gap adjustment mechanism. Carriage Movement Mechanism The figure below shows carriage mechanism. The top of the carriage is supported by the CR guide frame, and down side is by the CR guide shaft. Since the carriage motor is stepping motor, the carriage moves freely, and the rotation of the motor is conveyed to the timing belt pulley and drive the timing belt. A part of the timing belt is attached to the head carriage, which is moved right and left on the carriage guide shaft by the rotation of the carriage motor. The timing belt is pre-pressed by the spring and adjust the elastic motion of the belt which is caused by temperature changes, and keep a certain belt strength and tension. The carriage home position detector uses photo coupler method and is located on the right edge of the mechanism. The detector is detected when the carriage flag interrupts the light emitted from the photo coupler. The carriage home position control performs open loop control after the HP detector detects standard position. After the location is determined for the carriage to move by the printing data, the control circuit calculates the pulse of the motor phase corresponding to the distance to move, and outputs that information to the motor. Therefore, the detection of mis-location is detected when the home signal is detected during printing or initialization and the printer goes to the error state. Also, the moving speed of the carriage is controlled by carriage motor drive frequency according to the printing data.
CR Motor CR Home Position Detector Spring
CR Guide Frame Flag
Timing Belt
Carriage CR Guide Shaft
Figure 2-2. Carriage Mechanism
Table 2-2. Specification of the Carriage HP Detector Category Method Voltage Switch Mode Specification Photoelectric transfer method 5VDC ± 5% Open : In the detector range Close : Out of the detector range
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Table 2-3. CR Motor Specification Category Type Coil Resistance Drive Voltage Drive Resolution Drive Method Current Consumption Drive Frequency Specification 200-pole, HB-type Stepping motor 3.5 ± 10% 42V±5% 0.106mm/step (1-2 phase) Constant current drive 1-2 phase, W1-2 phase Rated speed : 0.68A/phase At the waiting mode : 0.2A/phase 6677200Hz
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2.1.3 Ribbon Advance Mechanism
The ribbon advance mechanism consists of the rack mounted on the carriage guide frame, the pinion mounted on the carriage unit, planetary gear, combination gear and ratchet RD. When the carriage unit is moved right and left on the carriage guide shaft by the CR motor, the pinion is rotated by the rack and the motive power is conveyed to the planetary gear. When the carriage unit moves to left, the pinion is rotated by the rack, and the motive force is conveyed to the planetary gear. Also, when the carriage unit moves to the right side, the driving force from the planetary gear is once conveyed into the combination gear, and the combination gear drives the ratchet RD. Then the ratchet RD rolls up the ribbon.
Carriage Guide Frame Pinion Combination Gear Carriage Unit
Planetary Gear
Ribbon Cartridge Ink Ribbon
Ratchet RD
Ribbon Advance Roller
Figure 2-3. Ribbon Advance Mechanism
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2.1.4 Paper Advance Mechanism
The paper feed mechanism of this printer consists of the platen roller, paper feed roller, paper eject roller, PF motor, tractor unit, PW detector, PE (rear/front) detectors, release detector, and CSF mechanism(option). This printer performs paper advance by moving the paper horizontally.
Mechanism Frame Roller Assembly, PF,Support Paper Bail Roller Roller PF Drive Tractor Transmission Gear
To CSF Mechanism
Roller Assembly, Paper Eject, Drive
Platen Roller
PF Motor
Tractor Gear
Figure 2-4. Paper Advance Mechanism
2.1.4.1 Paper Advance Mechanism
Driving force of the PF motor is conveyed through the paper feed gears to roller assembly, paper eject drive, paper bail roller, platen roller, roller assembly, PF support and roller, PF drive, and advances paper. The driving force conveyed to the tractor gear is sent to the CSF drive gear in case the CSF is mounted. Also, the tractor transmission gear conveys driving force to the tractor gear by the release mechanism and enables the push tractor to feed the paper. Friction Advance Mechanism The paper is held between paper eject and the roller assemblies located under the carriage guide shaft (2 for each up and down; total 4) Paper Load : Front automatic feed (manual feed), paper load from the CSF Paper Eject : Front paper eject Push tractor Mechanism By changing the release lever from the cut sheets position to the continuous paper position manually, the mode is changed from friction mode to tractor mode. In the tractor mode, the driving force for paper load is conveyed to the tractor side, and the contact to the roller is lost by the release mechanism. Paper Load : Tractor Paper Eject : Front paper eject Table 2-4. Paper Advance Specification Category Type Coil Resistance Drive Voltage Drive Method Micro paper sending Drive Frequency Rated Current Specification 2-phase 96 poles Hybrid type Stepping Motor 16.0 ± 10% (at 25 °C, per phase) 42V ± 5% Bi-pola constant current drive 1-2, 2-2 phase, W1-2 phase, 1/360 inch(1-2 phase) 6007000Hz 0.535A (constant speed)
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2.1.4.2 Paper Advance Detector Mechanism
Paper advance detector mechanism consists of PW detector and PE (rear/front) detectors. The function of this mechanism is to feedback information about monitoring paper edges, paper width and paper jam, and to control paper advance. The detector's reading operation is constantly performed. The timing to feedback the red signals is necessarily selected by CPU according to the operation of PF motor and CR motor. The table below shows specification of the detectors and their functions.
Print Head CR Motor TOP Detector Mask Guide
Looking from the front face. Rear PE Detector Roller Assembly, PF, Support
Platen
Looking from the top.
TOP Detector Print Head Front PE Detector Roller Assembly, Paper Eject, Drive Mask Guide
Figure 2-5. Paper Advance Detector Mechanism
Table 2-5. Detector Function and Operation Detectors PW detector Operation Paper width measurement (detects right and left edges) Paper top edge detector(detects top and bottom edges) Detects if there is any paper or not Detects top and bottom margin Detects if there is any paper or not Function Determines right and left margin Determines top and bottom margin Detects paper jam after checking paper loading and ejecting. Determines top and bottom margin Detects paper jam and paper out (if PW detector does not detect the paper out) after checking paper loading and ejecting. Front entry in case of cut sheet auto feed
PE detectors (Rear/Front)
Front paper detector only
Detects paper top margin
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Table 2-6. Front Paper End Detector Category Type Switch Rating Switch Mode Specification Mechanism type 0.61.0mA, 5VDC ± 5% Paper in : Open Paper out : Close
Table 2-7. Rear Paper End Detector Category Type Switch Rating Switch Mode Specification Mechanism type 0.61.0mA, 5VDC ± 5% Paper in : Open Paper out : Close
Table 2-8. TOP Detector Specification Category Type Voltage Switch Mode Specification Photoelectric transfer method 5VDC ± 5% Paper in : Short Paper out : Close
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LQ-670 Service Manual
2.1.4.3 Release Lever Mechanism
Release lever mechanism consists of the release lever, tractor transmission gear and the release detector. The setting of the release lever enables to add or release the pressure to the paper advance rollers and also to change over the tractor drive(continuous paper mode) which can be done by releasing or conveying the driving force of the PF motor to the tractor transmission gear and tractor gear, and the friction drive(cut sheet mode). The release lever moves the rink release lever through the lever release support, and presses the roller assembly, PF support to the paper strongly or weakly. In the cut sheet mood, the driving force of PF motor is conveyed to the paper feed(advance) mechanism. The roller assembly, PF support press the cut sheet actively, and paper advance is performed. In the continuous paper mode, the paper advance is performed by conveying the driving force of PF motor to the tractor gear through the tractor transmission gear. In this mode, the roller assembly, PF support is just to push the paper lightly. The release detector detects if the release mechanism is set for cut sheet mood or for continuous paper mood. According to the detector, the main control recognizes an appropriate mode. The table below shows specification of the release detector. Table 2-9. Specification of the Release Detector Category Type Switch Rating Switch mode Specification Mechanism type 0.61.0mA, 5VDC±5% Friction mode :Open Tractor mode :Close
Tractor Gear Release Detector
Tractor Transmission Gear
Roller, PF Drive
Figure 2-6. Release Mechanism
Release Lever
Rev. A
2-9
Chapter 2 Operating Principles
2.1.5 Platen Gap Adjustment
Platen gap (the gap between platen surface and print head) allows the printer to use different thickness of paper by setting appropriate gap so that the different thickness of paper can avoid getting printing dirt or picking the ribbon accidentally. Adjustment mechanism consists of the CR guide shaft, parallelism adjustment bush, adjust lever and PG detector. The rotating center of the CR guide shaft is angled to the rotating center of the adjust lever. Rotating the adjust lever enables the print head to get closer to or away from the platen surface. The parallelism adjustment bush should set the CR guid