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EPSON
IMPACT DOT MATRIX PRINTER
EPSON LQ-670
SERVICE MANUAL
SEIKO EPSON CORPORATION
4007875
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NOTICE All rights reserved. Reproduction of any part of this manual in any form whatsoever without SEIKO EPSON’s express written permission is forbidden. The contents of this manual are subjects to change without notice. All efforts have been made to ensure the accuracy of the contents of this manual. However, should any errors be detected, SEIKO EPSON would greatly appreciate being informed of them. The above notwithstanding SEIKO EPSON can assume no responsibility for any errors in t
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PRECAUTIONS Precautionary notations throughout the text are categorized relative to 1) personal injury and 2) damage to equipment. 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 WARNING Headings. CAUTION Signals a precaution which, if ignored, could result in damage to equipment. The precautionary measures itemized below should always be observed when performing repair/mainte
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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. OPERA
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REVISION SHEET Revision Issued Data Contents Rev. A May 28, 1997 First issue v
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TABLE OF CONTENTS CHAPTER 1. GENERAL DESCRIPTION CHAPTER 2. OPERATING PRINCIPLES CHAPTER 3. DISASSEMBLY AND ASSEMBLY CHAPTER 4. ADJUSTMENT CHAPTER 5. TROUBLESHOOTING CHAPTER 6. MAINTENANCE APPENDIX vi
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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 ..................................................
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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 :106 columns (10cpi) Printing Speed :High speed draft 300cps :Draft 250cps :LQ 83cps at 10cpi Feeding Method :Friction feed (front manual, rear CSF) :Push tractor feed (rear) Feeder :Rear push t
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LQ-670 Service Manual Consumables and optional units Table 1-1. Consumables and Optional Units Name Part Number Ribbon cartridge S015016 High capacity cut sheet feeder (Bin1) C806781 (EAI version) High capacity cut sheet feeder (Bin1) C806782 (Non-EAI version) Second bin cut sheet feeder (Bin2) C806791 (EAI version) Second bin cut sheet feeder (Bin2) C806792 (Non-EAI version) Roll paper holder #8310 Serial I/F card C82305* / C82306* 32KB intelligent serial I/F card C82307* / C82308* 32KB intel
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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 : Impact dot matrix Number of pins : 24 pins Print pin arrangement : 12x2 staggered Print pin diameter : 0.0079 inch (0.20 mm) Color : Black Print direction : Bi-direction with logic seeking Head Center Figure 1-2. Pin Configuration 1-3 Rev. A
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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 Printing Mode Character Pitch 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
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Chapter 1 Product Description 1.2.3 Paper Handling Specifications Feeding method :Friction feed (front manual, rear CSF) Push tractor feed (rear) Feeder :Rear push tractor CSF Bin1/Bin2 (Option) Roll paper holder(Option) Paper path :Manual Insertion Front in, front out CSF Rear in, front out Tractor Rear in, front out Line Spacing :1/6 inch or programmable in increments of 1/360 inch Feed speed :Refer to the table 1-4. Release Lever :The release lever must be set according to t
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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 Width (inch) 3.6 11.7 3.9 11.7 3.9 11.7 (mm) 91 297 100 297 100 297 Length (inch) 3.5 16.5 3.6 16.5 8.
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Chapter 1 Product Description Envelope Table 1-9. Envelope Specification Front Entry (Manual Insertion) Rear Entry (CSF) Minimum Maximum Minimum Maximum Envelope Width (inch) 6.5 6.5 (No.6) (mm) 165 165 Length (inch) 3.6 3.6 (mm) 92 92 Envelope Width (inch) 9.5 9.5 (No.10) (mm) 241 241 Length (inch) 4.1 4.1 (mm) 105 105 Total thickness (inch) 0.0063 0.0197 0.0063 0.0197 (mm) 0.16 0.52 0.16 0.52 The difference of thickness at the The difference of thickness at the printable area is within 0.009
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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) Minimum Maximum Width (inch) 4 12 (mm) 101.6 304.8 Length(one page) (inch) 4 22 (mm) 101.6 558.8 Copies 1 original + 4 copies Total thickness (inch) 0.0025 0.015 (mm) 0.065 0.39 2 Weight (g/m)52 82 (not multi part) (lb) 14 22 2 Weight (g/m)40 58 (one sheet of multi part) (lb) 12 15 Quality Plain paper, Reclaimed paper Carbonl
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Chapter 1 Product Description Roll paper Table 1-13. Roll Paper Specification Rear Entry (Roll paper holder) Minimum Maximum Width (inch) 8.5 (mm) 216 Length (inch) ----- (mm) Thickness (inch) 0.0028 0.0035 (mm) 0.07 0.09 2 Weight (g/m)52 82 (lb) 14 22 Quality Plain paper, Reclaimed paper. Not curled, not folded, not crumpled. 1-9 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 Single sheet Multi part PW (Width) (Refer to section 1.2.4) (Refer to section 1.2.4) PL (Length) (Refer to section 1.2.4) (Refer to section 1.2.4) LM (Left margin) 3 mm or more(PW<=297mm) 3 mm or more(PW<=297mm) RM (Right margin) 3 mm or more(PW<=297mm) 3 mm or more(PW<=297mm) TM (Top margin) 0.0mm or more 0.0mm or more BM (Bottom margin) 0.0mm
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Chapter 1 Product Description Envelope and card RM LM 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 Envelope Card PW (Width) (Refer to section 1.2.4) (Refer to section 1.2.4) PL (Length) (Refer to section 1.2.4) (Refer to section 1.2.4) LM (Left margin) 3 mm or more 3 mm or more RM (Right margin) 3 mm or more 3 mm or more TM (Top margin) 0.0mm or more *1 0.0mm or more *1 BM (Botto
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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 Continuous paper PW (Width) (Refer to section 1.2.4) PL (Length) (Refer to section 1.2.4) LM (Left margin) 13mm or more RM (Right margin) 13mm or more TM (Top margin) 4.2mm or more BM (Bottom margin) 4.2mm or more 1-12 Rev. A
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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 Continuous paper PW (Width) (Refer to section 1.2.4) PL (Length) (Refer to section1.2.4) LM (Left margin) 3mm or more RM (Right margin) 3mm or more TM (Top margin) 0.0mm or more BM (Bottom margin) 0.0mm or more 1-13 Rev. A
