Epson LQ 670 User Manual

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Page 1

EPSON

IMPACT DOT MATRIX PRINTER

SERVICE MANUAL

EPSON LQ-670

SEIKO EPSON CORPORATION

4007875

Page 2

NOTICE

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 f or 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.

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PRECAUTIONS

Precautionary notations throughout the text are categorized relative to 1) personal injury and 2) damage to equipment.

WARNING

CAUTION

The precautionary measures itemized below should always be observed when performing repair/maintenance procedures.

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.

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 CO NNECTED, USE EXT REME CAUT ION IN W O RKING ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS.

CAUTION

1. REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED O NLY BY EPSON CERTIFIED REPAIR TECHNICIAN.

2. MAKE CERTAIN THAT T HE SOURCE VOLT AGE IS THE SAME AS T HE RATED VOLT AGE, 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 T HE EPSON PRODUCT HAS BEEN DISCONNECT ED 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

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PREFACE

This manual descr ibes functions , theory of electrical and m echanical operations , maintenanc e, and repair of EPSON LQ-670. The instructions and procedur es included herein are intended for the experience r epair 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.

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REVISION SHEET

Revision Issued Data Contents

Rev. A May 28, 1997 First issue

Page 6

CHAPTER 1. GENERAL DESCRIPTION CHAPTER 2. OPERATING PRINCIPLES CHAPTER 3. DISASSEMBLY AND ASSEMBLY CHAPTER 4. ADJUSTMENT CHAPTER 5. TROUBLESHOOTING CHAPTER 6. MAINTENANCE APPENDIX

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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 ...................................................................................................................... 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

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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 tractor

CSF Bin1/Bin2 (Option) Roll paper holder (Option)

Paper/Media :Single sheet, Continuous paper, Multi part paper, Envelope, Card,

Label and Roll paper.

Fonts :9LQ & 1 Draft Bitmap and 4 Scarable typefaces

:8 Bar code fonts

Character tables :Standard version 11 tables

NLSP version 20 tables

Input buffer :64 Kbytes Acoustic noise :55dB(A) (ISO7779 pattern) Reliability :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

Interface :Bi-directional parallel interface (IEEE-1284 nibble mode supported)

Type B/I/F level 2 (Option)

Control code :ESC/P 2 and IBM 2390 Plus emulation Copy capability :1 original + 4 copies Control panel functions :Font, Condensed, Pause, Tear off, Bin, LF/FF, Load/Eject, Micro Adjust

and the default settings

Printable area :70 lines are available at A4.

(Top margin 0 mm setting and Bottom margin 0 mm setting are available)

Control Panel

Edge Guide

Stacker

Paper Guide

Ribbon Cartridge

Power Switch

Push Tractor

I/F Connector

Printer Cover

Print Head

Adjust Lever

Release lever

Paper Feed Knob

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 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 intelligent parallel I/F card C82310* / C82311* Local Talk I/F card C82312* 32KB IEEE-488 I/F card C82313* Coax I/F card C82314* Twinax I/F card C82315* Ethernet I/F card C82331* IEEE-1284 parallel I/F card C82345* Multi Protocol Ethernet I/F card C82346*

Note*)

: The number represented by an asterisk varies, depending on the country.

Rev. A

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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

Chapter 1 Product Description

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

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

Note) 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. 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 Horizontal density Vertical density Adjacent dot print

High speed draft 90dpi 180dpi No Draft 120dpi 180dpi No Draft condensed 240dpi 180dpi No LQ 360dpi 180dpi N0 8 pins bit image 60, 80, 90 or 120dpi 60dpi Yes

120 or 240dpi 60dpi No

24 pins bit image 60,90,120 or 180dpi 180dpi Yes

360dpi 180dpi No

Raster graphics 180 or 360dpi 180 or 360dpi Yes

Control code : ESC/P 2 and IBM 2390 Plus emulation (Refer to control code)

Rev. A

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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 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

Normal mode Copy mode

1/6 inch feed 60 msec 70 msec Continuous feed 0.127MPS(m/sec)

5.0 IPS(inches/sec)

Table 1-5. Release Lever Position

Lever Position Paper path/Feeder Paper/Media

Friction Manual insertion(front) Cut sheet(Single sheet& Muti part)

Card

CSF Bin1 Cut sheet(Single sheet & Multi part)

Envelope, Card CSF Bin2 Cut sheet(Single sheet) Roller paper holder Roll paper

Tractor Push tractor feed(rear) Continuous paper(Single sheet & Multi

part)

Table 1-6. Paper Thickness Lever Position

Lever Position Paper thickness (inch) Paper thickness (mm)

Minimum Maximum Minimum Maximum

0 0.0024 0.0047 0.065 0.12 1 0.0047 0.0075 0.12 0.19 2 0.0075 0.0102 0.19 0.26 3 0.0102 0.0126 0.26 0.32 4 0.0126 0.0142 0.32 0.36 5 0.0142 0.0157 0.36 0.40 6 0.0157 0.0205 0.40 0.52

0.092 MPS(m/sec)

3.6 IPS(inches/sec)

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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 8.3 16.5

(mm) 90 420 92 420 210 420

Thickness(inch) 0.0025 0.0055 0.0025 0.0055 0.0025 0.0055

(mm) 0.065 0.14 0.065 0.14 0.065 0.14

Weight (g/m2)529052905290

(lb) 14 24 14 24 14 24

Quality Plain paper, Reclaimed paper, Not curled, not folded, not crumpled.

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) Rear Entry (CSF)

Minimum Maximum Minimum Maximum

Width (inch) 3.6 11.7 3.9 11.7

(mm) 91 297 100 297

Length (inch) 3.5 16.5(11.7) 3.6 16.5

(mm) 90 420(297)

( ):Value of line

glue one side of

form.

Copies 1 original + 4 copies 1 original + 4 copies Total thickness (inch) 0.0047 0.015 0.0047 0.015

(mm) 0.12 0.39 0.12 0.39 Weight (g/m2)40 58 40 58 (one sheet of multi part) (lb) 12 15 12 15 Quality Plain paper, Reclaimed paper

Not curled, not folded, not crumpled

Jointing Line glue at the top or one side of

form

Note):

Printing on multi part. Don’t use CSF 2nd bin.

Plain paper, Reclaimed paper Not curled, not folded, not crumpled Line glue at the top of form

92 420

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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 printable area is within 0.0098 inch (0.25mm)

Weight (g/m2)45 91 45 91

(lb) 12 24 12 24

Quality BOND paper, PLANE paper or AIR

MAIL. No glue at a flap, Not curled, not folded, not crumpled

The difference of thickness at the printable area is within 0.0098 inch (0.25mm)

BOND paper, PLANE paper or AIR MAIL. No glue at a flap, Not curled, not folded, not crumpled

Note1)

: Printing on envelope is available only under normal temperature and humidity conditions.

Note2): Note3):

Card

Width (inch) 4.1 5.8 4.1 5.8 Length (inch) 4.1 5.83 4.1 5.8 Thickness (inch) 0.0087 0.0087 Weight (g/m2) 192 192 Quality Plain paper, Reclaimed paper

Note1) Note2):

Set the longer side of envelope horizontally. Don’t use CSF 2nd bin.

Table 1-10. Card Specification

Front Entry (Manual Insertion) Rear Entry(CSF)

Minimum Maximum Minimum Maximum

(mm) 105 148 105 148 (mm) 105 148 105 148 (mm) 0.22 0.22 (lb) 51 51

Plain paper, Reclaimed paper

Not curled, not folded, not crumpled

: Printing card is available only under normal temperature and humidity conditions.

Don’t use CSF 2nd bin.

Not curled, not folded, not crumpled

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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 Weight (g/m2)52 82 (not multi part) (lb) 14 22 Weight (g/m2)40 58 (one sheet of multi part) (lb) 12 15 Quality Plain paper, Reclaimed paper

Carbonless multi part paper

Jointing Point glue or paper staple(both side)

Continuous paper with Labels

Table 1-12. Continuous Paper with Labels

Rear Entry (Tractor)

Minimum Maximum

Label size See the figure below. Base sheet width (inch) 4 12

(mm) 101.6 304.8 Base sheet length (inch) 4 22 (one page) (mm) 101.6 558.8 Base sheet (inch) 0.0028 0.0035 Thickness (mm) 0.07 0.09 Total thickness (inch) 0.0063 0.0075

0.16 0.19

Label weight (g/m2)68

(lb) 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

Rev. A

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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

Weight (g/m2)52 82

(lb) 14 22

Quality Plain paper, Reclaimed paper. Not curled, not folded, not

crumpled.

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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) RM (Right margin) TM (Top margin) 0.0mm or more 0.0mm or more BM (Bottom margi n) 0.0mm or more 0. 0mm or more

3 mm or more(PW<=297mm) 3 mm or more(PW<=297mm) 3 mm or more(PW<=297mm) 3 mm or more(PW<=297mm)

1-1

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Envelope and card

Chapter 1 Product Description

Printable Area

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 (Bottom margi n) 0.0mm or more 0.0mm or more

Note *1)

: When loading the paper from CSF, TM(Top margin) is 4.2 mm or more.

Rev. A

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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 margi n) 4.2mm or more

1-1

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Roll paper

Chapter 1 Product Description

Printable Area

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 margi n) 0.0mm or more

Rev. A

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LQ-670 Service Manual

1.2.6 Ribbon Cartridge

Type : Fabric Color : Black Ribbon life : 2 million characters (LQ 10cpi, 48 dots/character) Dimensions :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 : AC120V Input voltage range : AC103.5 to 132V Rated frequency range : 50 to 60 Hz Input frequency range : 49.5 to 60.5 Hz Rated current : 0.7A(max.2.2A) Power consumption : Approx.30W (ISO/IEC10561 Letter pattern)

Energy Star Compliant

Insulation resistance : 10 MΩ min.(between AC line and chassis, DC 500V) Dielectric strength : AC1000 Vrms. 1min.or

AC1200 Vrms. 1 sec.(between AC line and chassis)

230 V version

Rated voltage : AC220 to 240V Input voltage range : AC198 to 264V Rated frequency range : 50 to 60Hz Input frequency range : 49.5 to 60.5Hz Rated current : 0.4A (max.1.1A) Power consumption : Approx.30W (ISO/IEC10561 Letter pattern)

Energy Star Compliant

Insulation resistance : 10MΩ min. (between AC line and chassis, DC 500V) Dielectric strength : AC1500 Vrms. 1min.(between AC line and chassis)

1.2.9 Reliability

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

1-1

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Page 22

1.2.10 Environmental Condition

Temperature

Operating : 5 to 35 °C(without condensation)

: 15 to 25 °C (without condensation and during printing on multi part paper, envelope, card or label)

Non-operating : −30 to 60 °C

Humidity

Operating : 10 to 80% RH (without condensation)

: 30 to 60% RH (without condensation and during printing on multi part paper, envelope, card or label)

Non-operating : 0 to 85% RH (without condensation)

Resistance to shock

Operating : 1G, within 1ms Non-operating : 2G, within 2ms

Resistance to vibration

Operating : 0.25G,10 to 55 Hz Non-operating : 0.50G,10 to 55 Hz

Chapter 1 Product Description

1.2.11 Safety Approvals

120V version

Safety standards : UL1950 with D3

CSA C22.2 No.950 with D3

EMI : FCC part15 subpart B class B

: CSA C108.8 class B

230V version

Safety standards : EN60950(VDE, NEMKO) EMI : 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)

Rev. A

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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: :ESC/P 2 and IBM 2390 Plus emulation Typefaces :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 10.5pt., 8pt.-32pt.(every 2pt.) EPSON Sans Serif 10.5pt., 8pt.-32pt.(every 2pt.) EPSON Roman T 10.5pt., 8pt.-32pt.(every 2pt.) EPSON Sans Serif H 10.5pt., 8pt.-32pt.(every 2pt.)

: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

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

Character table Bitmap font Scalable font

Standard version

NLSP version

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)

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 Roman EPSON Sans Serif EPSON Roman T EPSON Sans Serif H

PC864(Arabic) EPSON Draft

EPSON Roman 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

EPSON Draft

EPSON Roman

EPSON Sans Serif

EPSON Courier

EPSON Prestige

EPSON Script

EPSON Draft(Arabic)

EPSON Naskh

EPSON Kufi

EPSON Draft(Hebrew)

EPSON Miriam

EPSON David

(Not supported) (Not supported)

(Not supported)

Note *1) These fonts are not selected in the default setting mode.

Note)

Rev. A

ESC R command is effective on the character tables with bold weight.

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LQ-670 Service Manual

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]

Table 1-19. Connector Pin Assignment and Signals

Pin No. Signal Name Return

1 /STROBE 19 In Stroke pulse. Input data is latched at falling edge of

2∼9DATA1∼820∼27

10 /ACKNLG 28 Out This signal (negative pulse) indicates that the printer

11 BUSY 29 Out This signal’s “HIGH” level indicates that the printer

12 PE 28 Out This signal’s “HIGH” level indicates that the printer

13 SLCT 28 Out Always at high level when the printer is powered on. 14 /AFXT 30 In Not used. 31 /INIT 30 In This signal’s negative pulse initializes printer. 32 /ERROR 29 Out This signal’s low level means the printer is in a state

36 /SLIN 30 In Not used. 18 Logic H ---- Out 35 +5V --- Out

17 Chassis --- --- Chassis GND. 16,33 19-30 15,34 NC --- --- Not connected.

GND --- --- Signal GND.

: 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)

In/Out * Function description

GND

the signal.

In Each signal represents information of parallel data

from 1 bit to 8 bit. The data is 1 at “HIGH” and is 0 at “LOW”.

has received data and is ready to accept next one. The pulse width is 5µs.

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)

is in a state of paper-out error.(Refer to the next page for the condition when this signal becomes high level.)

of error. (Refer to the next page for conditions when the signal becomes low level)

This line is pulled up to +5V through 3.9 kΩ resistor. This line is pulled up to +5V through 1.0 kΩ resistor.

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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Chapter 1 Product Description

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.

Note)

Rev. A

Figure 1-9. Data Transmission Timing

Table 1-20. Maximum and Minimum Timings for Data Transmission

Parameter Minimum Maximum

tsetup 500 nsec ---

thold 500 nsec ---

tstb 500 nsec ---

tready 0 ---

tbusy --- 500 nsec treply --- ---

tack 500 nsec 10 us

tnbusyt 0 ---

tnext 0 ---

ttout* --- 120 nsec

ttin** --- 200 nsec

* Rise and fall time of output signals. ** Rise and fall time of input signals.

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LQ-670 Service Manual

1.3.2.2 Parallel Interface (Reverse channel)

[Transmission mode] [Adaptable connector] [Synchronization] [Handshaking] [Signal Level]

[Data transmission timing] [Extensibility request]

when the request is 00H or 04H, which mean;

[Device ID]

Table 1-21. Connector Pin Assignment and Signals

Pin No.

1 HostClk 19 In Host clock signal 2∼9DATA1∼820∼27

10 PtrClk 28 Out Printer clock signal. 11 PtrBusy, DataBit-3,7 29 Out Printer busy signal and reverse channel

12 AckDataReq, DataBit-2, 6 28 Out Ack nowledge data request signal and reverse 13 Xflag, DataBit-1, 5 28 Out X-flag signal and reverse channel trans f er data 14 HostBusy 30 In Host busy signal.

31 /INIT 30 In Not used. 32 /Data Av ail, DataBit-0, 4 29 Out Data available signal and reverse channel

36 1284-Active 30 In 1284 active signal. 18 Logic-H --- Out A high signal indicates that all other signals

35 +5V --- Out 17 Ch assis --- --- Chassis GND.

16,33,

19-30 15,34 NC --- --- Not connected.

GND --- --- Signal GND.

Signal Name Return

: 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,

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;

In/Out* Function description

GND

In Parallel input data to the printer.

transfer data bit 3 or 7. channel transfer data bit 2 or 6. bit1 or 5.

transfer data bit0 or 4.

sourced by the peripheral are in a valid state. This line is pulled up to +5V through 1.0 kΩ

resistor.

Note*):

1-2

In/Out refers to the direction of signal flow/from the printer’s point of view.

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Chapter 1 Product Description

1.3.2.3 Optional Interface

Type-B optional interface cards are available.

Table 1-22. Optional Interface

Reply message ESC/P2 IBM 2390 Plus

Main-Type MT24p,PW106cl10cpi,PRG(W0xxxx)rev MT24p,PW106c110cpi,PRG(W0xxxx)rev

Product-Name LQ-670 LQ-670

Emulation-Type ESCPL2-00 PRPXL24-01

Entity-Type EPSONLQ2 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 bus y state, the selected inter f ace 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 s elec ted, the inter f ace s ends X OFF and s ets the DT R s ignal 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 s everal 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

Micro Adjust

LF/FF

Draft Roman

Sans Serif Courier

Prestige

Script

Others

Font

Condensed

Paper Out

Pause

Figure 1-10. Control Panel

3sec

Load/Eject

Tear Off/Bin

Tear Off

Bin 1 Bin 2 Card

LED Off

LED On LED Blinks

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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Chapter 1 Product Description

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 Function

Operate Turn the printer on and off. Pause Alternates printing and no-printing status.

Enables Micro Adjust function, holding it down for 3 seconds.

Load/Eject Loads or ejects the paper.

Executes micro feed forward, when this function is enabled.

LF/FF 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.

Tear Off/Bin Advances continuos paper to the Tear-off position.

Selects CSF bin ½ or Card mode. Font Selects font. Condensed Alternates condensed mode and non-condensed mode.

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 Function

Load/Eject LQ self test LF/FF Draft self test Font Default setting Load/Eject & LF/FF Data dump Condensed &Tear Off/Bin Clear EEPROM Pause Bi-d adjustment Font & Condensed Quiet mode The others 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 Function

Font Selects the Menu Tear Off/ Bin Changes the setting The others 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

Chapter 1 Product Description

LED

Printer Status Pause On --- --- --- ---

Paper out error On On --- --- --Paper jam error Paper eject error Head hot Blink --- --- --- --Micro Adjust Blink --- --- --- --Tear off --- --- *3 --- --Bin selection --- --- *3 --- --Condensed --- --- --- On --Font selection --- --- --- --- *4 Fatal error Blink Blink Blink Blink 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.

Pause

On Blink --- --- --On Blink --- --- ---

Paper Out

Tear Off/Bin Condensed Font

*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 Beeper sounds

Paper out error Paper jam error Paper eject error Release lever operation error Illegal panel operation

❍ ❍ ❍

● ● ● ● ● ❍ ❍ ❍

● ● ● ● ● ❍

Note

❍ : Beeper sounds approx. 100ms and interval is approx.100ms.

)

● : Beeper sounds approx. 500ms and interval is approx.100ms.

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Chapter 1 Product Description

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 s heet 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) W hen Tear off/Bin switch is pressed, printer changes the indication to the “s ubmenu” 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 Setting/Value

Character table Standard version:

PC 437

Italic, Abicomp, ISO Latin1, Roman8 NLSP version:

PC437

Italic, 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 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.

Italic U.S.A

Italic Sweden, Italic Italy, Italic Spain

OCR-B, Orator, Orator-S, Script C,

3 inch, 3.5 inch, 4 inch, 5.5 inch, 6 inch, 7 inch, 8 inch, 8.5 inch,

inch

, 70/6 inch, 12 inch, 14 inch, 17 inch

, Off

Bi-d

Auto,

ESC/P2

Auto,

10sec

On,

, IBM2390 Plus

Parallel I/F, Option I/F

., 30sec.

, off

Off,

Others

Off Off Off Off Off

, Off

, PC850, PC860, PC863, PC865, PC861, BRASCII,

, PC437 Greek, PC850, PC852, PC853, PC855, PC857,

, Italic France, Italic Germany, Italic U.K., Italic Denmark,

Roman T

, Uni-d

, Sans serif H

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LQ-670 Service Manual

Note*1):

Note*2) Note*3 Note*4

Note*5):

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.

2) Select most closely aligned number by pressing LF/FF(↓) and Load/Eject(↑) switches.

is also changed by according to the selection.

3) Fix the selected number by pressing Font switch.

4) Repeat 2)-3) until finishing Bi-d. adjustment for LQ mode.

5) Turn the printer off.

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 : These settings are effective when IBM 2390 Plus emulation is selected.

): Settings with bold weight mean the standard factory settings. ): “Italic Denmark” is as same as “Italic Denmark 1”, and “Italic Spain” is as same as “Italic Spain

1”.

Hebrew7, Hebrew8, PC862 are not selected in the default setting mode.

4.3

Bi-d Adjustment

The guide to adjust Bi-d alignment in this mode is printed and first alignment pattern is printed. 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

Selected number is fixed and next alignment pattern is printed. 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

Note)

The setting values are stored into non-volatile memory and retained even if EEPROM is reset.

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Chapter 1 Product Description

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 s tate 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)

PROM(IC8)

Reset IC(IC12)

PROM(IC5)

EEPROM(IC9)

PSRAM(IC5)

Flash-EPROM(IC7)

CPU(IC11)

Print Head Driver

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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Chapter 1 Product Description

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

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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

Head Driving Coil

Iron Core

Paper

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.

Stopper

Wire Resetting Spring

Wire

Ink Ribbon

Ribbon Mask

Platen

Rev. A

2-1

Page 41

Chapter 2 Operating Principles

Category Specification

Print Method Impact dot matrix Number of pin wires 24-pin (12X2) Wire diameter 0.20mm Print head life 200 million strokes/wire Weight Coil direct current resistance Response Frequency Normal Mode : 1500Hz

Drive Voltage Drive Condition

Environmental condition

Print drive method Constant voltage drive method

Table 2-1. Print Head Specification

115 ± 12g

39.3 ± 2.7 Ω (at 25 °C) Buzzer : 1.5KHz

42 ± 3V

• Normal Drive

• Thick paper (using multipart or thick papers)

• Buzzer function

Temperature : 5∼55 °C Humidity : 10∼85%

Rev. A

Page 42

LQ-670 Service Manual

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

Timing Belt

Carriage

CR Guide Frame

Flag

Figure 2-2. Carriage Mechanism

Spring

CR Home Position Detector

CR Guide Shaft

Table 2-2. Specification of the Carriage HP Detector

Category Specification

Method Photoelectric transfer method Voltage Switch Mode Open : In the detector range

Rev. A

5VDC ± 5% Close : Out of the detector range

Page 43

Chapter 2 Operating Principles

Category Specification

Type 200-pole, HB-type Stepping motor Coil Resistance Drive Voltage Drive Resolution 0.106mm/step (1-2 phase) Drive Method Constant current drive

Current Consumption Rated speed : 0.68A/phase Drive Frequency

Table 2-3. CR Motor Specification

3.5Ω ± 10% 42V±5%

1-2 phase, W1-2 phase At the waiting mode : 0.2A/phase

667∼7200Hz

Rev. A

Page 44

LQ-670 Service Manual

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.

Ribbon Cartridge

Ink Ribbon

Carriage Unit

Combination Gear

Planetary Gear

Carriage Guide Frame

Pinion

Ratchet RD

Ribbon Advance Roller

Figure 2-3. Ribbon Advance Mechanism

Rev. A

Page 45

Chapter 2 Operating Principles

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 Assembly, Paper Eject, Drive

Roller PF Drive

Platen Roller

PF Motor

Tractor Transmission Gear

To CSF Mechanism

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 Specification

Type 2-phase 96 poles Hybrid type Stepping Motor Coil Resistance Drive Voltage

16.0Ω ± 10% (at 25 °C, per phase) 42V ± 5%

Drive Method Bi-pola constant current drive

1-2, 2-2 phase, W1-2 phase, Micro paper sending 1/360 inch(1-2 phase) Drive Frequency

600∼7000Hz Rated Current 0.535A (constant speed)

Rev. A

Page 46

LQ-670 Service Manual

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.

CR Motor

Platen

Print Head

Rear PE Detector

Roller Assembly, PF, Support

Roller Assembly, Paper Eject, Drive

TOP Detector

Mask Guide

Looking from the front face.

Looking from the top.

TOP Detector

Front PE Detector

Mask Guide

Figure 2-5. Paper Advance Detector Mechanism

Table 2-5. Detector Function and Operation

Detectors Operation Function

PW detector Paper width measurement (detects

Determines right and left margin right and left edges) Paper top edge detector(detects

Determines top and bottom margin top and bottom edges) Detects if there is any paper or not Detects paper jam after checking

paper loading and ejecting.

PE detectors (Rear/Front) Detects top and bottom margin Determines top and bottom margin

Detects if there is any paper or not Detects paper jam and paper out (if

PW detector does not detect the

paper out) after checking paper

loading and ejecting.

Front paper detector only Detects paper top margin Front entry in case of cut sheet

auto feed

Rev. A

Page 47

Chapter 2 Operating Principles

Category Specification

Type Mechanism type Switch Rating Switch Mode Paper in : Open

Category Specification

Type Mechanism type Switch Rating Switch Mode Paper in : Open

Category Specification

Type Photoelectric transfer method Voltage Switch Mode Paper in : Short

Table 2-6. Front Paper End Detector

0.6∼1.0mA, 5VDC ± 5% Paper out : Close

Table 2-7. Rear Paper End Detector

0.6∼1.0mA, 5VDC ± 5% Paper out : Close

Table 2-8. TOP Detector Specification

5VDC ± 5% Paper out : Close

Rev. A

Page 48

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 Specification

Type Mechanism type Switch Rating Switch mode Friction mode :Open

0.6∼1.0mA, 5VDC±5% Tractor mode :Close

Roller, PF Drive

Figure 2-6. Release Mechanism

Tractor Gear

Release Detector

Tractor Transmission Gear

Release Lever

Rev. A

Page 49

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 guide shaft parallel to the platen surface. The PG detector detects the position of the adjust lever and changes the printing speed to the copy mode when using the thick paper and setting the adjust lever more than 2 levels.

Adjsut Lever

CR Guide Shaft

Print Head

Rotation Center of the CR Guide Shaft

Figure 2-7. Platen Gap Adjustment Mechanism

Table 2-10. PG Detector Specification

Category Specification

Type Mechanism Type Switch Rating

0.6∼1.0mA, 5VDC±5%

Switch Mode Normal Mode : Open

Copy Mode : Short (more than 2 levels)

PG Detector

2-1

Rev. A

Page 50

LQ-670 Service Manual

2.2 Power Supply Operation

2.2.1 Power Supply Circuit

The power supply part of this printer consists of AC cable and power supply board. The power supply board provides CD current, which is necessary for the printer mechanism and control circuit. There are two kinds of board according to the input voltage; C214PSB(100-120VAC) and C214PSE(220-240VAC). Refer to the table below.

Table 2-11. Power Supply Board

Board Input voltage Input frequency range Fuse F1 Rating

C214PSB 85-138VAC 47-63Hz 4A/125V, 250V C214PSE 187- 276VAC T2.0A/250V

2.2.1.1 Power Supply Overview

The power supply board has two power outputs for use by various control circuits and drive mechanisms. The table below shows the output voltages and applications for the two DC output supply voltages.

Table 2-12. Output Voltages and Application

Output voltage Range of the

output voltage

+42V

+5V

39.9∼441.V

4.75∼5.25V

Rated output

current

0.8A

0.7A

Range of output

current 0∼3.0A •Print head drive

•CR motor drive

•PF motor drive

0∼0.7A •Logic line

•Detector

•Operation panel LEDs

Applications

Rev. A

2-1 1

Page 51

Chapter 2 Operating Principles

2.2.1.2 Power Supply Circuit Operation

In the power supply circuit, at first, the input AC power goes to the filter circuit, where removes the noise, and goes to the diode bridge for full-wave rectification and is smoothed by the electrolytic capacitor. Then it goes to the switching regulator on the primary side. This regulator uses ZC-RCC (ringing choke converter) type and effectively generates +42VDC in the secondary side. Also, +42VDC generates +5VDC by the DC-DC converter(chopper IC). Power supply switch is mounted on the operation panel, and the PSC(power supply control signal) turns ON/OFF the switching FET through the photo coupler in the primary side. Therefore, input voltage is in the primary side when the AC cable is plugged in. When it is off, the current consumption is less than 1W. Also, since C11 is constantly charged, current does not come in suddenly. PSC turns on the power in the open state and turn off at the GND level. If the harness connecting with the operation panel is broken or disconnected and the PSC is in the open state, the power will be always on.

+42, +5V Lines Over voltage Protection Circuit

When the output level of the +42V exceeds 55V, the switching FET in the primary side goes off via the Zener diode (ZD52, ZD87), Transistor Q55, Q54, Q82 and photo coupler PC1. When the output level of the +5V exceeds 10V, the switching FET in the primary side goes off via the Zener diode (ZD53) Transistor Q55, Q54, Q82 and photo coupler PC1. In order to recover from this, plug off the AC cable and leave the C11 about 5 minutes in order to let it discharge electricity, and remove the cause of the over voltage and turn the power on again.

Over Current Protection Circuit

When the output current drops to 11Ω in case of +42V, and 4.2Ω in case of +5V, and lasted longer than 1 second, over current is detected and the switching FET in the primary side goes off via transistor Q53, Q54 Q82 and photo coupler PC1. However, if +42V or +5V shorts just before the Over current protection circuit works, peripheral elements of Q1 are destroyed in case of +42V. In case of +5V, peripheral elements of Q5 are destroyed. In order to recover from this, plug off the AC cable and leave the C11 about 5 minutes in order to let it discharge electricity, and remove the cause of the over voltage and turn the power on again.

Power Down Detector

When the output voltage of +42V becomes low and unable to maintain stable voltage, the power down signal (PWDN) is output to the control circuit by OP. AMP (IC52B).

Output Voltage Stabilization

+42V is fed back to the primary side via Zener diode(ZD51, ZD81∼86 and photo coupler PC1) and stabilizes the output voltage. +5V stabilizes the output voltage by chopper IC.

The figure below shows power supply circuit block diagram.

[Primary Side]

Diode Bridge

EMI Filter

Fuse

AC Power Supply

Smoothing Circuit

ZC-RCC Switching Circuit

Half Wave Rectifier/Smoothing Circuit

PC101

[Secondary Side]

DC-DC Convertor

Constant VoltageCircuit

Power Down Sensor Circuit

+5VDC

+42VDC

Protection Circuit

PWDN

PSC

Figure 2-8. Power Supply Circuit Block Diagram

2-1

Rev. A

Page 52

LQ-670 Service Manual

2.2.2 Control Circuit

This section describes main function of the control circuit. The main circuit is mounted on the C214 main board.

2.2.2.1 Operating Principles of the Control Circuit

This printer’s control circuit includes a TM96C041AFCPU that runs at 17.20MHz, an E05B42 gate array, a 8M PROM, or 2M/4M Flash-ROM, 1M PS-RAM, 32M MROM, EEPROM, Reset IC and various drive elements. The table below shows each function of the main components of the main board.

Table 2-13. Functions of the Main Board

Component Address Function

TMP96C041AF IC11 As CPU, controls C214 main.

•Detects analog signal by A/D converter

•Controls CR motor and PF motor

•Controls EEPROM

•Outputs Address/Data

E05B42 IC10 Gate array

•Address latch of the address/data bus from the CPU

•Generation of printing data, control of pulse width, the

delay of the printing timing

•Interface control Parallel/Type-B

•Operation panel control

•PF motor control, CR motor current change over

8Mbit PROM IC8 2/4M bit Flash ROM (IC7) If this is installed instead of IC8,

8Mbit MROM IC5 Character generate (CG) 1Mbit PS-RAM IC6 Various buffers PST592D IC12 Reset IC

93C46 IC9 3 wires system; serial In/out put EEPROM

SLA7024M IC3 CR motor drive TEA3718SDP IC1,2 PF motor drive

•Registers control program

•System reset

•Backup of the setting values

•Backup of threshold

•Backup of Bi-D value, default setting and Maintenance

data, such as the starting year, month, etc.

Head Thermistor

Flash-ROM /PROM

CR Motor Driver

DRAM

Address/Data Bus

Reset IC

EEPROM

Operation Panel

CPU TMP96C01AF (IC11)

PG Sensor

PE-Rear Sensor

PE-Front Sensor

PW(TOP) Sensor

CR Home Position

Parallel I/F

Type-B I/F (OP.)

Release Lever

Head

Head Driver

Gate Array E05B42 (IC10)

PF Motor Driver

Figure 2-9.Control Circuit Block Diagram

Rev. A

2-1

Page 53

Chapter 2 Operating Principles

2.2.2.2 EEPROM Control Circuit

EEPROM(IC9) uses three lines serial in/output 1kbit EEPROM and records default setting values and destination parameter. Control signals of EEPROM; CS,CK,DO, DI are attached in the CPU port P70∼73 and, are controlled. When the power off is detected, the CPU writes the necessary data to the EEPROM before the +5V line drops out of the normal range. The other CPU access is done during power supply, but the access for safety is not done when the CPU is in the reset state.

EEPROM (IC9)

Power-off

CPU (IC11)

P70

INTO

P71 P72

P73

Figure 2-10. EEPROM Circuit

2.2.2.3 System Reset Circuit

The reset IC(IC12) of this printer sends reset signal to the CPU and gate array until +5V line for control stabilizes after the power is turned on, and prevents the printer from going to mis-operation.

Gate Array (IC10)

ResetIC (IC12)

VOUT

MRES

+5V

Figure 2-11. Reset Circuit

/RESET

CPU (IC11)

/RESET

P26

2-1

Rev. A

Page 54

LQ-670 Service Manual

2.2.2.4 Power Off Detector Circuit

Power-Down signal from the power supply board is sent to the port INTO of the CPU. The CPU initializes the port P26 and sends a signal to the manual reset port MRES in the Reset IC(IC12) in order to let IC12 to output the reset signal.(Refer to Figure 2-9) When the Power Down signal breaks into during the waiting mode, the CPU considers it as POWER-OFF immediately and performs POWER-OFF operation. If Power Down signal breaks into during the printing operation, the CPU stops printing immediately and checks if the Power Down signal is output after a certain time passed, which is about 10ms. If the Power-Down signal is output, the CPU considers it as POWER OFF and performs POWER OFF operation. After the POWER OFF is detected, the CPU holds at least 32 bite writing time for the EEPROM. After writing is completed, the CPU reset the whole circuit system by setting the port P26 “HIGH”.

2.2.2.5 Print Head Driver Circuit

The print head driver circuit of this printer consists of the gate array, NPN transistor with Zener Diode built in and print head. Also, this circuit outputs the print signal from the port HD1∼HD24 in the gate array to the transistor and drives the print head. The built in Zener Diode absorbs back electromotive force, which is caused by the coil of the print head.

Gate Array (IC10)

HD1

HD24

NPN Transistor (Q1-Q24)

Figure 2-12. Print Head Driver Circuit

Print Head

Rev. A

2-1

Page 55

Chapter 2 Operating Principles

2.2.2.6 CR Motor Driver Circuit

The CR motor driver circuit of this printer consists of CPU, gate array, CR motor drive IC SLA7024M (IC3) and CR motor. The CPU sends phase data; INA, /INA, INB and/INB from the port PGO0-3 to the CR motor IC. The current setting is de-coded in the CRFA0-3 and CRFB0-3 of the gate array by the CPU and is output to the CR motor drive IC. The CR motor driver IC outputs phase signals; CRA, /CRA, CRB, /CRB to the CR motor. The CR motor is driven at open loop control uni-pola rated current type by the drive IC.

Gate Array (IC10)

CRRFA0-3 CRRFB0-3

CR Motor Drive (IC3)

CPU (IC11)

REFA/B

CR Motor

CRA CR/A CRB CR/B

PGO0-3

INA /INA INB /INB

OUTA /OUTA OUTB /OUTB

Figure 2-13.CR Motor Driver Circuit

2.2.2.7 PF Motor Driver Circuit

The PF motor driver circuit of this printer consists of CPU, gate array, PF motor drive IC(IC1, IC2) and PF motor. The CPU sends phase data(PFPHASEA/B) to the PF motor drive IC via the gate array. Also, the current control signals;PF10A/1A, PF10B/1B are outputs to the PF motor drive IC via gate array for current setting. The PF motor drive IC outputs phase signals; PFA, /PFA, PFB, /PFB to the PF motor. The CR motor is driven at open loop control bi-pola rated current type by the driver ICSLA7024M(IC3). Also, the current is controlled by the /PFHOLD signal from the gate array when the reset is performed.

CPU (IC11)

Gate Array (IC10)

PFI0A/1A PFI0B/1B

PF Motor Drive IC (IC1, IC2)

I00/1

PF Motor

PFPHASEA/B

/PFHOLD

PHASE

REF

OUTA OUTB

PFA PF/A PFB PF/B

Figure 2-14.PF Motor Driver Circuit

2-1

Rev. A

Page 56

LQ-670 Service Manual

2.2.2.8 Operation Panel Control Circuit

The panel control circuit consists of panel switches and gate array. The gate array detects the switch condition by the port SW0-SW5 and controls LED by LED0-9. Also, the POWER OFF signal(PSC) by the power switch on the operation panel is directly sent to the power supply circuit.

Gate Array (IC10)

Operation Panel

Power Supply Circuit C214PSB/PSE

PSC

Figure 2-15. Operation Panel Control Circuit

SW0-5

LED0-9

Switches

LEDs

POWER SW

Rev. A

2-1

Page 57

Chapter 2 Operating Principles

2.2.2.9 Interface(I/F) Circuit

The interface of this printer consists of gate array, parallel I/F connector and optional type-B I/F connector. Input of parallel I/F is pulled up by 3.3KΩ resistance and goes to 10Ω resistance, which is serially connected to the port DIN0-7 of the gate array. The output is done from the port in the gate array via LS06. The input signal of Type-B I/F; /CMREQ, /WRRDY, /RDREQ and output signal INH are connected to the gate array via 100Ω resistance which is connected serially. The input signals are pulled up by 1KΩ resistance, and are connected to the gate array serially. The output signals are output from the gate array via serially connected 100Ω resistance.

2.2.2.10 Head Temperature Detector Circuit

This printer has the thermistor in the print head, which monitors the head temperature in order to prevent the head coil from being degraded or worn out by the continuous high duty printing. The head temperature signal HTMP measures the resistance value of the thermistor as voltage in the A/D converter of the CPU port AN0 by sending the current to the 1.21KΩ±1% resistor, w hich is connected serially to the thermistor.

2.2.2.11 Head Drive Voltage Measurement Circuit

The head voltage drive circuit consists of the partial pressure resistance and CPU. Drive voltage is pressured 1/9 by resistance and is input to the port of CPU as VREF signal, and is measured by A/D converter in the CPU inside.

2.2.2.12 Rear and Front Paper End Detector Circuit

The PE detector circuit of this printer consists of PE detectors(each at front and rear) by micro-switch and CPU. Each detector opens when there is a paper, and shorts when there is no paper.

2.2.2.13 Paper Width Detector Circuit

The paper width detector circuit consists of the paper width detector on the mask holder and CPU. The paper width detector uses photoelectric transfer method and detects top and bottom of the paper and paper width. The signal of the paper width detector is input to the port P52 of CPU, and is detected its level by the A/D converter. When there is a paper, the paper width detector shorts and opens when there is no paper.

2.2.2.14 Carriage Home Position (HP) Detector Circuit

The HP detector circuit of this printer consists of photoelectric transfer method type detector and CPU. The HP detector detects the carriage home position. The output of the HP detector is input to the port P53 of CPU and is detected its level by the A/D converter which is built inside. When the carriage is in the home position, the detector opens, and shorts when the carriage is out of home position.

2.2.2.15 Release Lever Detector Circuit

The release lever detector circuit consists of the release lever detector micro switch and gate array. The release lever detector signal(RELEASE) is detected in the port of the gate array. The detector opens at the friction mode and shorts at the tractor mode.

2.2.2.16 Adjust Lever Detector Circuit

The adjust lever detector circuit of this printer consists of the micro switch detector and CPU. The detector shorts, and printing speed becomes copy mode when the adjust level is more than 2 levels. The detector opens, and printing speed becomes normal when the adjust level is less than 1 level.

2-1

Rev. A

Page 58

Chapter 3

Disassembly and Assembly

3.1 Overview..............................................................................................3-1

3.1.1 Precautions for Disassembling the Printer..............................3-1

3.1.2 Tools...........................................................................................3-1

3.1.3 Service Check After Repair.......................................................3-2

3.1.4 Specifications for Screws..........................................................3-3

3.2 Printer Disassembly and Assembly...................................................3-4

3.2.1 HOUSING, UPPER Removal......................................................3-5

3.2.2 Printer Mechanism Removal.....................................................3-6

3.2.3 C214 MAIN Board Removal.......................................................3-7

3.2.4 C214 PSB/PSE Board Removal.................................................3-8

3.2.5 EP-ROM Replacement................................................................3-9

3.2.6 Printhead Removal...................................................................3-10

3.2.7 Ribbon Mask Removal.............................................................3-11

3.2.8 PAPER EXIT ASSY. Removal...................................................3-12

3.2.9 Ribbon Mask Holder Removal.................................................3-13

3.2.10 PW Detector (Top) Removal..................................................3-14

3.2.11 MOTOR, CR Removal.............................................................3-15

3.2.12 Carriage Assy. Removal........................................................3-16

3.2.12.1 RATCHET, RD Removal...............................................3-18

3.2.13 PAPER GUIDE Removal.........................................................3-19

3.2.14 Platen Removal......................................................................3-22

3.2.15 MOTOR, PF Removal.............................................................3-23

Page 59

3.2.16 DETECTOR, HP Removal....................................................... 3-24

3.2.17 DETECTOR, PG Removal.......................................................3-24

3.2.18 DETECTOR, REL Removal..................................................... 3-24

3.2.19 DETECTOR, PE, FRONT Removal......................................... 3-25

3.2.20 DETECTOR, PE, REAR Removal........................................... 3-26

3.2.21 LEVER, RELEASE Removal................................................... 3-27

3.2.22 Tractor ASSY. Removal ......................................................... 3-28

Page 60

Chapter 3 Disassembly and Assembly

3.1 Overview

This section describes procedures for disassembling the main components of EPSON LQ-

670. Unless otherwise specified, disassembled units or components can be reassembled by reversing the disassembly procedure. Therefore, no assembly procedures are included in this section. Precautions for any disassembly or assembly procedure are described under the heading " described under the heading "

3.1.1 Precautions for Disassembling the Printer

See the precautions below when disassembling and assembling EPSON LQ-670.



Disconnect the AC power cable before disassembling or assembling the printer.



Be careful with the printhead when you handle it, as it may be very hot just after the printing.



Leave the printer for five minutes or more after disconnecting the AC cable, to completely discharge high electric charge remains in the electrolyte capacitor on the power supply board.



Do not touch the heat sink, attached to the switching FET (Q1) on the power supply board, just after power off as it may be very hot.



Never touch the heat sink attached to the switching FET (Q1) while the AC cable is connected to the AC outlet, as it is not electrically isolated.

WORK POINT

". Any adjustments required after disassembling the units are

REQUIRED ADJUSTMENT

WARNING

CAUTION



Use only specified tools for disassembly and assembly of the printer.



Use only specified lubricants and adhesives with the printer. (See Chapter 6 for details)



Follow the instructions only described in this manual when you perform an adjustment. (See Chapter 4 for details)

3.1.2 Tools

The table below lists the tools and the instruments required for disassembling, assembling or adjusting the printer. Use only tools that meets these specifications.

Table 3-1. Tool and Instrument List

Name Specification EPSON Part No.

Phillips Screwdriver No.2 B743800200 Box Driver 7.0mm diagonal B741700200 Tweezers B741000100 E-Ring Holder Size : #2.5 B740800400 E-Ring Holder Size : #4 B740800600 Soldering Iron B740200100 Thickness Gauge t = 0.42 mm B776702201 Digital Multi-Meter OHM/Voltage/Current ----Oscilloscope Min. 50MHz -----

Note) All tools and instruments listed above are commercially available.

Rev. A

3-1

Page 61

LQ-670 Service Manual

3.1.3 Service Check After Repair

After completing repair of the product, use the check list shown below, to verify status of repaired product and all the repair work performed before returning the product to the users. This list can be used as a record of all service work performed with the product.

Table 3-2. Repair Status Check List

Category Component Item to Check Status

Printer Mechanism

Operation Self-Test Was the self-test printing successful? Checked, OK

Adjustment Platen-Gap Is the gap adjusted correctly?

ROM Version Latest version = ( ) Checked, OK Packing Ribbon

Printhead Are all wires print properly? Checked, OK

Not necessary Carriage Mechanism

Paper Feed Mechanism

Paper Path Are all types of paper advance

Ribbon Mask Is the ribbon mask free of damage? Checked, OK

On-line Test Was the on-line printing successful? Checked, OK

Bi-D Alignment

Cartridge Attachments Have all relevant attachments been

Does the carriage move smoothly?

zNoisy? zAny dirt or excessive oil?

Is the Carriage motor at the normal temperature? (Not too hot?) Is paper advance smoothly?

zNoisy? zPaper is jamming?

Is the paper-feed motor at the normal temperature? (Not too hot?)

smoothly? Is the tractor feeding paper smoothly? Checked, OK

Are all paper paths clear of an obstructions? Is the platen free of damage? Checked, OK

(PG = Is the bi-directional alignment made properly?

Has the ribbon cartridge been removed from the printer?

packed together with the printer?

Checked, OK

Not necessary

Checked, OK

Not necessary

Checked, OK

Not necessary

Checked, OK

Not necessary

Checked, OK

Not necessary

Checked, OK

Not necessary

Checked, OK

Not necessary

Checked, OK

Not necessary

Checked, OK

Not necessary

Checked, OK

Not necessary

3-2

Rev. A

Page 62

Chapter 3 Disassembly and Assembly

3.1.4 Specifications for Screws

The table below lists the abbreviations used in this manual for small parts, such as screws and washers.

Table 3-3. Abbreviations and Screw Type

Abbreviation Description Screw Type

ross-recessed

ind-head Screw

CBS

CBB

ross-recessed

ind-head

-Tight Screw

ross-recessed

ind-head

-Tight Screw

ross-recessed

an-head

Rev. A

Page 63

LQ-670 Service Manual

3.2 Printer Disassembly and Assembly

This section describes procedures for disassembling the main components of the printer. Since re-assembling the printer can be done by simply performing the disassembly procedures in reverse order, this chapter does not describe the assembly procedures. If necessary, special notes on re-assembling or adjusting a component are given at the end of each procedure.

CAUTION



Before disassembling any part of the printer, note the warnings in Section 3.1.1.



Make sure to remove any cables and the accessories attached to the printer; such as the ribbon cartridge, the sheet guide, the platen knob, from the printer before disassembly.

Note) Exploded diagrams in APPENDIX show you how each component fit together. Refer

to them as necessary.

The flowchart below show you the basic order for disassembly.

START

HOUSING, UPPER

Removal

Printer Mechanism

Removal

C214 MAIN Board

Removal

C214 PSB/PSE Board

Removal

MOTOR, CR

Removal

CARRIAGE ASSY.

Removal

PAPER GUIDE

Removal

EP-ROM Removal

MOTOR, PF

Removal

RATCHET, RD

Removal

PAPER EXIT ASSY.

Removal

Ribbon Mask Holder

Removal

PW DETECTOR (Top)

Removal

HP DETECTOR

Removal

PG DETECTOR

Removal

REL DETECTOR

Removal

Printhead

Removal

Ribbon Mask

Removal

LEVER, RELEASE

Removal

TRACTOR ASSY.

Removal

3-4

PLATEN ASSY.

Removal

PE DETECTOR (FR)

Removal

PE DETECTOR (RE)

Removal

Figure 3-1. Disassembly Flowchart

Rev. A

Page 64

Chapter 3 Disassembly and Assembly

3.2.1 HOUSING, UPPER Removal

1. Remove the platen knob from the printer.

2. Remove two screws (CBB/M4x14) fixing [COVER, WIRE] and remove it.

3. Disconnect the cable of the control panel from a connector CN15 on C214 MAIN board.

4. Remove two screws (CBB/M4x14) fixing [HOUSING, UPPER].

5. Unhook two tabs fixing [HOUSING, UPPER] to lower housing, at both front and rear, and remove it by lifting it upward.

CBB (M4x14)

COVER, WIRE

HOUSING, UPPER

Hooks (Front/Rear)

CBB (M4x14)

Figure 3-2. HOUSING UPPER Removal

Rev. A

Page 65

LQ-670 Service Manual

3.2.2 Printer Mechanism Removal

1. Remove [HOUSING, UPPER] (See Section 3.2.1)

2. Disconnect all cables of the Printer Mechanism from the C214 MAIN board:

zCN5 (ÕPW Detector (Top)) zCN6 (ÕPrinthead (Front)) zCN7 (ÕPrinthead (Rear)) zCN8 (ÕPF Motor) zCN9 (ÕCR Motor) zCN10 (ÕREL Detector) zCN11 (ÕPG Detector) zCN12 (ÕHP Detector) zCN13 (ÕPE Detector (Rear)) zCN14 (ÕPE Detector (Front))

3. Remove four screws (Mechanism fixing screw) and take out the Printer Mechanism from the lower housing.

PRINTER MECHANISM

Mechanism Fixing Screw (4)

3-6

Figure 3-3. PRINTER MECHANISM Removal

Rev. A

Page 66

Chapter 3 Disassembly and Assembly

3.2.3 C214 MAIN Board Removal

1. Remove [HOUSING, UPPER] (See Section 3.2.1)

2. Remove Printer Mechanism (See Section 3.2.2)

3. Remove seven screws (5: CBB/M3x12, 2: CBS/M3x4) fixing the shield plate, and remove the shield plate.

4. Remove two screws (CBS/M3x12) fixing [COVER, CONNECTOR, UPPER], and remove [COVER, CONNECTOR, UPPER].

5. Disconnect the cable of power supply unit from a connector CN3 on C214 MAIN board.

6. Remove four screws (CBB/M3x12) fixing C214 MAIN board, and remove C214 MAIN board together with [GROUND PLATE, I/F, UPPER].

7. Remove [GROUND PLATE, I/F, UPPER] from C214 MAIN board.

8. Remove [GUIDE, I/F BOARD;B] from C214 MAIN board by unhooking two tabs.

9. Remove two screws (CP/M3x12) fixing [GROUND PLATE, I/F] and remove it from C214 MAIN board.

CAUTION



Be careful with the edges of the shield plate, as they are very sharp.



Make sure to match a RED marking on the cable of the motors, to pin 1 of connector on C214 MAIN board when you re-connect them.

CBB (M3x12)

GROUND PLATE, I/F, UPPER

GUIDE, I/F BOARD; B

CBS (M3x4)

SHIELD PLATE

COVER, CONNECTOR, UPPER

C214 MAIN BOARD

Figure 3-4. C214 MAIN Board Removal

Rev. A

Page 67

LQ-670 Service Manual

3.2.4 C214 PSB/PSE Board Removal

1. Remove [HOUSING, UPPER] (See Section 3.2.1)

2. Remove the Printer Mechanism (See Section 3.2.2)

3. Remove the shield plate (See Section 3.2.3 at step 3)

4. Disconnect the cable of C214 PSB/PSE board from a connector CN3 on C214 MAIN board.

5. Remove the AC inlet assembly from a connector CN1 on C214 PSB/PSE board.

6. Remove three screws (CBB/M3x12) and one plane-washer fixing C214 PSB/PSE board to the lower housing, and take out C214 PSB/PSE board.

Cable (connected to CN3 / C214 MAIN)

CBB (M3x12)

Plain Washer

C214 PSB/PSE BOARD

Figure 3-5. C214 PSB/PSE Board Removal

3-8

Rev. A

Page 68

Chapter 3 Disassembly and Assembly

3.2.5 EP-ROM Replacement

When the program ROM (EP-ROM) on C214 MAIN board need to be replaced (for program version-up), follow the instruction below.

1. Remove two screws (CBB/M4x14) fixing [COVER, WIRE] and remove it.

2. Remove the EP-ROM from the IC socket IC8 on C214 MAIN board.

CHECK POINT

When you remove or re-install the EP-ROM, be careful not to damage the lead terminals of the IC.

EP-ROM

Rev. A

COVER, WIRE

Figure 3-6. EP-ROM Removal

Page 69

LQ-670 Service Manual

3.2.6 Printhead Removal

1. Open the printer cover.

2. Remove two screws (CBS/M3x10) fixing the printhead to the carriage assembly, and remove the printhead.

3. Disconnect the cables connected to the printhead.

CAUTION

Make sure that C214 MAIN board operates correctly, before replacing the printhead to new one. Otherwise, it may be damaged again if C214 MAIN board is defective.

CBS (M3x10)

PRINTHEAD UNIT

Figure 3-7. PRINTHEAD Removal

REQUIRED ADJUSTMENT



PG Adjustment (See Chapter 4, Section 4.2.1)

3-10

Rev. A

Page 70

Chapter 3 Disassembly and Assembly

3.2.7 Ribbon M ask Removal

1. Remove the printhead (See Section 3.2.6)

2. Remove the ribbon mask from the ribbon mask holder, by unhooking the tabs that hold the ribbon mask in place.

CHECK POINT

Be careful not to damage or deform the ribbon mask when you handle it.

RIBBON MASK

RIBBON MASK HOLDER

Figure 3-8. RIBBON MASK Removal

Rev. A

3-11

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LQ-670 Service Manual

3.2.8 PAPER EXIT ASSY. Removal

1. Remove [HOUSING, UPPER] (See Section 3.2.1)

2. Remove two screws (CBS/M3x6) fixing the Paper Exit Assy. to the Printer Mechanism.

3. First, slightly pulling the Paper Exit Assy. toward you, then lifting it upward to remove it.

CHECK POINT

When re-installing the Paper Exit Assy., fix it while pushing it against the Printer Mechanism.

PAPER EXIT ASSY.

Figure 3-9. PAPER EXIT ASSY. Removal

3-12

Rev. A

Page 72

Chapter 3 Disassembly and Assembly

3.2.9 Ribbon M ask Holder Removal

1. Remove [HOUSING, UPPER] (See Section 3.2.1)

2. Remove the Printhead (See Section 3.2.6)

3. Remove the Paper Exit Assy.(See Section 3.2.8)

4. Unhook the cables (to Printhead / PW Detector) from a cable hook on the Carriage Assy.

5. Unhook two tabs fixing the Ribbon Mask Holder to the Carriage Assy., and slightly pulling it forward.

6. Disconnect the cable from PW Detector attached on the Ribbon Mask Holder, and remove the Ribbon Mask Holder.

CHECK POINT

When re-assembling the Ribbon Mask Holder, make sure that the cable of PW Detector is correctly guided at the back of the Carriage Assy., as shown below, and is not contacting the CR guide shaft and the paper feed roller assembly.

RIBBON MASK HOLDER

Figure 3-10. RIBBON MASK HOLDER Removal

Hooks (on Carriage ASSY.)

CONNECTOR (to PW DETECTOR)

Rev. A

3-1

Page 73

LQ-670 Service Manual

Cable (to PW DETECTOR)

PW DETECTOR

RIBBON MASK HOLDER

CARRIAGE ASSY. (viewed from right-hand side)

CR Guide Shaft

ROLLER, PF, DRIVE

Figure 3-11. Cable Rooting

3.2.10 PW Detector (Top) Removal

1. Remove [HOUSING, UPPER] (See Section 3.2.1)

2. Remove the Printhead (See Section 3.2.6)

3. Remove the Paper Exit Assy. (See Section 3.2.8)

4. Remove the Ribbon Mask Holder (See Section 3.2.9)

5. Remove one screw (CB/M2.5x6) fixing the PW Detector (Top) and remove it.

CAUTION

When you fixing the PW Detector (Top) to the Ribbon Mask Holder, be careful not to damage a screw hole on the Ribbon Mask Holder.

Tightening Torque:0.1±0.02Nm (1.0±0.2Kgf-cm)

PW DETECTOR

RIBBON MASK HOLDER

CB (M2.5x6)

3-14

Figure 3-12. PW DETECTOR Removal

Rev. A

Page 74

Chapter 3 Disassembly and Assembly

3.2.11 MOTOR, CR Removal

1. Remove the Printer Mechanism (See Section 3.2.2)

2. Unhook the cable of [MOTOR, CR] from a cable hook at the bottom of the Printer Mechanism.

3. Remove [TENSION SPRING, 14.5] attached at the top right of the Printer Mechanism, to loosen the timing belt.

4. Remove four screws (CBS/M3x6) fixing the CR motor assembly to the Printer Mechanism, and remove it.

5. Remove two screws (CBS/M3x6) and remove [MOTOR, CR] from [MOUNTING PLATE, MOTOR, CR].

REQUIRED ADJUSTMENT



Bi-D Alignment Adjustment (See Chapter 4 Adjustment)

Motor Cover

TENSION SPRING, 14.5

MOTOR, CR

CBS (M3x6)

TIMING BELT

CBS (M3x6)

Figure 3-13. MOTOR, CR Removal

Rev. A

3-1

Page 75

LQ-670 Service Manual

3.2.12 Carriage Assy. Removal

1. Remove the Printer Mechanism (See Section 3.2.2)

2. Remove [TENSION SPRING, 14.5] attached at the top right of the Printer Mechanism, to

loosen the timing belt.

3. Remove [CAP, LEVER] and [HOLDER, ADJUST, LEVER].

4. Remove an hexagonal nut which fixing the adjust lever to the carriage guide shaft, and

remove the adjust lever.

5. Take out the head FFC from the cable holder at the bottom of the Printer Mechanism.

6. Remove [HOLDER, CABLE, UPPER] from [FRAME, CR], by slightly slide it to right while

unhooking a locking tab.

7. Remove two screws (CBS/M3x6) fixing [GUIDE, CR] at both ends and remove it.

8. Remove [LEVER, PULLEY, DRIVEN], [SHAFT, LEVER, PULLEY, DRIVEN] and the

driven pulley.

9. Remove [BUSH, PARALLELISM] by rotating it to match the tabs and a hole of the frame.

10. Remove [CR GUIDE SHAFT] together with the carriage ASSY. and remove the [CR

GUIDE SHAFT] from the carriage ASSY.

CAUTION

Be careful not to lose the oil pad and a pressure spring in the carriage ASSY., as it can easily come off when removing [CR GUIDE SHAFT].

CHECK POINT



Remove the printhead, before reinstalling the oil pad and a pressure spring into the carriage ASSY.



When attaching the timing belt to the carriage ASSY., be sure to attach it as shown in figure below.

REQUIRED ADJUSTMENT



Platen-Gap Adjustment (See Section 4 Adjustment)



Bi-D Alignment Adjustment (See Section 4 Adjustment)

3-16

Rev. A

Page 76

Chapter 3 Disassembly and Assembly

LEVER, PULLEY, DRIVEN

SHAFT, LEVER, PULLEY, DRIVEN

CAP, LEVER

HOLDER, ADJUST, LEVER

TENSION SPRING, 14.5

Adjust Lever

Hexagonal Nut

Figure 3-14. CARRIAGE ASSY. Removal (1)

GUIDE, CR

CARRIAGE ASSY.

CR GUIDE SHAFT

Figure 3-15. CARRIAGE ASSY. Removal (2)

Rev. A

3-1

Page 77

LQ-670 Service Manual

3.2.12.1 RATCHET, RD Removal

1. Remove the Carriage ASSY. (See Section 3.2.12)

2. Remove the Ribbon Cartridge Holder from the Carriage ASSY., by unhooking three tabs.

3. Take out [RATCHET, RD] from the Ribbon Cartridge Holder.

CHECK POINT

When re-installing the Ribbon Cartridge Holder to the Carriage ASSY., first, hook the bottom part of the Ribbon Cartridge Holder to the Carriage ASSY. and hold it. Then, turn up the upper side of the Ribbon Cartridge Holder to the Carriage ASSY. to fix it.

RATCHET, RD

Ribbon Cartridge Holder

3-18

Figure 3-16. RATCHET, RD Removal

Rev. A

Page 78

Chapter 3 Disassembly and Assembly

3.2.13 PAPER GUIDE Removal

1. Remove the Printer Mechanism. (See Section 3.2.2)

2. Remove the paper exit ASSY. (See Section 3.2.8)

3. Remove the carriage ASSY. (See Section 3.2.12)

4. Remove the CR motor cover from [FRAME, CR] and [MOTOR, CR].

5. Remove [DETECTOR, HP] and [DETECTOR, PG].

6. Remove [GEAR, 20] from [FRAME ASSY., RIGHT] by unhooking a tab.

7. Remove four screws (CBS/M3x6) fixing [FRAME,CR] to the frame assembly RIGHT and

LEFT, and remove [FRAME, CR].

8. Remove [GEAR, 14] and [COMBINATION GEAR, 16, 16] from the both ends of

[ROLLER, PF, DRIVE].

9. Remove an E-shaped retaining ring (#2) from the left end of [ROLLER, PF, DRIVE].

10. Remove the shaft holder at the both end of [ROLLER, PF, DRIVE].

11. Remove a screw (CBS/M3x6) fixing the CR motor frame to [FRAME ASSY., LEFT].

12. Take out [DETECTOR, PF, FRONT] from the paper guide.

13. Slide [ROLLER, PF, DRIVE] to right once to dismount the one end of the shaft from

[FRAME ASSY., LEFT], then slide it to left to remove it.

14. Remove an E-shaped retaining ring (#4) fixing [COMBINATION GEAR, 8, 30], and

remove [COMBINATION GEAR, 8, 30] and [GEAR, 36] from [FRAME ASSY., LEFT].

15. Remove four screws (CBS/M3x6) fixing the paper guide and remove it.

CAUTION

Be careful not to damage the actuator of [DETECTOR, PE, REAR] while removing [ROLLER, PF, DRIVE].

GEAR, 20 (WHITE)

Figure 3-17. PAPER GUIDE ASSY. Removal (1)

Rev. A

3-1

Page 79

LQ-670 Service Manual

GEAR, 36

COMBINATION GEAR, 8, 30

ROLLER, PF, DRIVE

GEAR, 16

Hook

FRAME, CR

Figure 3-18. PAPER GUIDE ASSY. Removal (2)

CBS (M3x6)

3-20

Figure 3-19. PAPER GUIDE ASSY. Removal (3)

Rev. A

Page 80

Shaft Holder

Chapter 3 Disassembly and Assembly

ROLLER, PF, DRIVE

Retaining Ring (#2) (E-shaped)

Shaft Holder

CBS (M3x6)

PAPER GUIDE

Slit of PAPER GUIDE

Actuator (DETECTOR, PE, REAR)

Rev. A

CBS (M3x6)

Figure 3-21. PAPER GUIDE ASSY. Removal (5)

3-21

Page 81

LQ-670 Service Manual

3.2.14 Platen Removal

1. Remove the Printer Mechanism (See Section 3.2.2)

2. Remove the Paper Exit ASSY. (See Section 3.2.8)

3. Remove the Carriage ASSY. (See Section 3.2.12)

4. Remove the Paper Guide (See Section 3.2.13)

5. Rotate the platen shaft holder at the both ends of the platen, to match a tab to a cutout of

the frame assembly.

6. Slide the platen to left once, and remove it to upward.

Shaft Holder

Retaining Ring (E-shaped)

PLATEN

Shaft Holder

Retaining Ring (E-shaped)

Washer (bent)

Washer (flat)

3-22

Figure 3-22. PLATEN Removal

Rev. A

Page 82

Chapter 3 Disassembly and Assembly

3.2.15 MOTOR, PF Removal

1. Remove the Printer Mechanism (See Section 3.2.2)

2. Take out the cable of [MOTOR, PF] from the cable holder at the bottom of Printer

Mechanism.

3. Remove tow screws (CBS/M3x6) fixing [MOTOR, PF] to [FRAME ASSY., LEFT] and

remove it.

MOTOR, PF (located inside [FRAME ASSY., LEFT])

CBS (M3x6)

Rev. A

Figure 3-23. MOTOR, PF Removal

3-2

Page 83

LQ-670 Service Manual

3.2.16 DETECTOR, HP Removal

1. Remove the Printer Mechanism (See Section 3.2.2)

2. Unhook [DETECTOR, HP] form [FRAME, CR] and remove it.

3. Disconnect the cable from [DETECTOR, HP].

3.2.17 DETECTOR, PG Removal

1. Remove the Printer Mechanism (See Section 3.2.2)

2. Unhook [DETECTOR, PG] from [FRAME ASSY., RIGHT] and remove it.

3. Disconnect the cable from [DETECTOR, PG].

3.2.18 DETECTOR, REL Removal

1. Remove the Printer Mechanism (See Section 3.2.2)

2. Unhook [DETECTOR, REL] from [FRAME ASSY., RIGHT] and remove it.

3. Disconnect the cable from [DETECTOR, REL].

DETECTOR, HP

Figure 3-24. DETECTOR HP / PG / REL Removal

DETECTOR, PG

DETECTOR, REL

3-24

Rev. A

Page 84

Chapter 3 Disassembly and Assembly

3.2.19 DETECTOR, PE, FRONT Removal

1. Remove the Printer Mechanism (See Section 3.2.2)

2. Remove the Paper Exit ASSY. (See Section 3.2.8)

3. Unhook the detector holder from both the Paper Guide Frame and a shaft of [ROLLER,

PF, DRIVE].

4. Unhook [DETECTOR, PF, FRONT] from the holder and remove it.

CHECK POINT

Make sure to hook the detector holder to [ROLLER, PF, DRIVE] when reinstalling it.

Holder

DETECTOR, PE, FRONT

Figure 3-25. DETECTOR, PE, FRONT Removal

DETECTOR, PE, FRONT (with Holder)

ROLLER, PAPER EJECT, DRIVE (Shaft)

Rotate

Hook two tabs

Figure 3-26. DETECTOR, PE, FRONT Installation

Rev. A

3-2

Page 85

LQ-670 Service Manual

3.2.20 DETECTOR, PE, REAR Removal

1. Remove the Printer Mechanism (See Section 3.2.2)

2. Unhook three tabs of [HOLDER, CABLE, LOWER] at the bottom of the Printer

Mechanism, and remove it from the Printer Mechanism.

3. Remove a screw (CBS/M3x6) fixing [DETECTOR, PE. REAR].

4. Remove the detector holder from [FRAME, BASE] by unhooking the fixing tabs and

remove it.

5. Unhook [DETECTOR, PF, REAR] from the holder and remove it.

DETECTOR, PE, REAR

3-26

Figure 3-27. DETECTOR, PE, REAR Removal

Rev. A

Page 86

Chapter 3 Disassembly and Assembly

3.2.21 LEVER, RELEASE Removal

1. Remove the Printer Mechanism (See Section 3.2.2)

2. Remove two E-shaped retaining rings (#4) that fixing [LEVER, RELEASE] to [FRAME

ASSY., RIGHT].

3. Remove [LEVER, RELEASE] from [FRAME ASSY., RIGHT], together with

[COMBINATION GEAR, 16, 16].

CHECK POINT



Be careful not to lose [GEAR, 20] and a washer when removing [LEVER, RELEASE] as they may be popped out by [COMPRESSION SPRING, 20].



Make sure that [GEAR, 20] moves smoothly when moving [LEVER, RELEASE].



Make sure to match the position marking on [LEVER, RELEASE] and [COMBINATION GEAR, 16, 16], as shown in figure below, when reinstalling [LEVER, RELEASE].

COMBINATION GEAR, 16,16

SPUR GEAR, 20 (White)

SPUR GEAR, 20 (Black / for Tractor)

COMPRESSION SPRING, 1.96

Washer

GEAR, 20 (Black)

LEVER, RELEASE

Retaining Ring (E-shape)

Figure 3-28. LEVER, RELEASE Removal

LEVER, RELEASE

COMBINATION GEAR, 16,16

LEVER, RELEASE

Figure 3-29. LEVER, RELEASE Installation

Rev. A

3-2

Page 87

LQ-670 Service Manual

3.2.22 Tractor ASSY. Removal

1. Remove the Printer Mechanism (See Section 3.2.2)

2. Remove two hexagonal nuts fixing [SHAFT, TR, GUIDE] at the both side of the

mechanism.

3. Rotate the shaft holder attached to the right end of [SHAFT, TR, DRIVE] to match the

tabs to a cutout of [FRAME ASSY., RIGHT], and remove it.

4. Remove the Tractor ASSY. from the Printer Mechanism.

CHECK POINT

When re-assemble the Tractor ASSY., make sure to match the position marking on [TRACTOR, RIGHT] and [TRACTOR, LEFT], as shown in figure below, while inserting [SHAFT, TR, DRIVE] into them.

Shaft Holder

SHAFT, TR, DRIVE

Hexagonal Nut

SHAFT, TR, GUIDE

TRACTOR, LEFT

PAPER SUPPORT

TRACTOR, RIGHT

Hexagonal Nut

Shaft Holder

Position Mark

Figure 3-30. TRACTOR ASSY. Removal

3-28

Rev. A

Page 88

Chapter 4

Adjustments

4.1 Adjustment Overview...........................................................................................4-1

4.1.1 Required Adjustments...........................................................................................................4-1

4.1.2 Required Adjustment Tools...................................................................................................4-1

4.2 Adjusting and Resetting the Printer....................................................................4-2

4.2.1 Platen Gap Adjustment..........................................................................................................4-2

4.2.2 Factory Settings......................................................................................................................4-3

4.2.3 Bi-d Adjustment......................................................................................................................4-5

Page 89

Chapter 4 Adjustments

4.1 Adjustment Overview

4.1.1 Required Adjustments

This section describes what adjustments are required after any part is removed or replaced. The following table shows the relationship between the repaired item and the adjustment.

Table 4-1. Required Adjustments

Required / Adjustment Platen Gap Bi-d Print

Alignment

Print Head Removal or Replacement Printer Mechanism Replacement Main Board Replacement ---

Timing Belt Replacement Platen Roller Replacement

or Removal CR Unit Replacement or Removal CR Motor Removal or Replacement PW(TOP) Detector Replacement EEPROM Initialization ---

Note*1) Note*2)

: --- means adjustment is not required. : ❍ means adjustment is required.

❍ (*2)

---

❍❍ ❍

❍❍

---

--- ---

4.1.2 Required Adjustment Tools

Factory Settings

---(*1) ---

❍❍ ❍❍

---

--- ---

---

❍

❍❍

---

❍

The following table shows the tools required for each adjustment.

Table 4-2. Required Adjustment Tools

Adjustment Required Tool Page

Platen Gap Thickness Gauge 4-2 Factory Settings Settings Diskette 4-3 Bi-d Print Alignment Settings Diskette 4-3

Rev. A

4-1

Page 90

LQ-670 Service Manual

4.2 Adjusting and Resetting the Printer

4.2.1 Platen Gap Adjustment

This adjustment consists of platen parallelism adjustment and platen gap adjustment. Parallelism adjustment is to adjust parallelism of track(CR guide shaft) that platen roller and print head moved. Since the core of parallelism adjustment bushing is tilted to the CR guide shaft, it is possible to move the CR guide shaft closer to or away from the platen roller by rotating the bushing. Parallelism adjustment is performed by equalizing the gap between the platen roller and CR guide shaft in the right and left edges of the printable area. On the other hand, the platen gap adjustment is to set the gap between the platen roller side and print head at the specified value. Since the core of the CR guide shaft is also tilted, it is possible to move the print head closer to or away from the platen roller by rotating the shaft.

1. Remove the upper housing. (Refer to section 3.2.4)

2. Remove the paper eject unit. (Refer to section 3.2.5)

3. Remove the print head. (Refer to section 3.2.2)

4. Remove the ribbon mask. (Refer to section 3.2.3)

5. Install the print head.

6. Set the adjust lever to the “0” column position.

7. Loosen a little bit the hexagon nut securing the PG adjust lever and CR guide shaft.

8. Rotate the CR guide shaft so that the big hole of the countersinking located on the right edge of the CR guide comes towards you.

9. Move the carriage unit to the left edge.

10. Set the thickness gauge to 0.43mm and insert it vertically between the print head and platen roller.

11. Insert the screwdriver into the hole of the countersinking located on the right edge of the CR guide shaft and rotate the screwdriver until the platen roller and print head touches each other lightly.

12. Move the carriage unit to the right edge.

13. Insert the thickness gauge between the print head and platen roller.

14. Continue performing adjustment steps 8 to 12 rotating the parallelism adjustment bushing until the parallelism gap of right and left becomes under 0.02mm.

15. When the parallelism gap of right and left becomes less than 0.02mm, move the carriage unit to the center position of the printable area.

16. Insert the thickness gauge between the print head and platen roller, and rotate the CR guide shaft so that the platen gap becomes 0.435 ± 0.015mm.

17. After the adjustment is over, tighten the hexagon nut securing the adjust lever.

18. Install the ribbon mask.

Do not rotate the platen roller during this adjustment.

;

Frame Assembly, Left

`

Frame Assembly, Right

B < 0.02

Figure 4-1. Platen Gap Adjustment

CAUTION

Hole of Contersinking

Parallelism Adjustment Bushing

Rev. A

Page 91

Chapter 4 Adjustments

4.2.2 Factory Setting

1. Unplug the cable of the printer from the AC socket.

2. Connect the printer and the PC by the parallel interface cable.

3. Plug in the cable of the printer and turn on the printer.

4. Set the release lever at the tractor side and also set the 12-inch continuous paper (1p).

5. Load “GWBASIC” and execute the adjustment program. Following menu will be displayed.

3URJUDP/4D 6HWWLQJ

95 95 95 

✼✼ ✼ ✼

>3ULQWVHOHFW@

 SLQV

! SLQV

6. In this menu, select 24 pins by moving the cursor with the ↑ or ↓ and press ENTER key. After 24 pins is selected, the following Setting file menu for default setting is shown.

3URJUDP/4D 6HWWLQJ SLQV95 95 95 

✼✼✼✼

>6HWWLQJILOH@ !'()67' ,7$/,&  86$67'  (8567'  1/63  5866,$1

In this Menu, select DEFSTD by moving the cursor with the ↑or ↓ and press ENTER key.

After the default setting, following menu will be displayed.

3URJUDP/4D 6HWWLQJ'()67' SLQV95 95 95 

✼✼ ✼ ✼

[ 3URFHVVVHOHFW@

 ! ,QOLQH

2XW*RLQJ

Table 4-3. Destination Setting

Destination Destination Code Destination Destination Code

EUL(Middle East), Japan DEFSTD EDG(NLSP) NLSP EAI, EAI(Latin), EAL, ESP, EHK, ETT Europe Standard, EDG, EUL(Nordic), EFS, EIS, EBS

8. In this Menu, select In line by moving the cursor with the ↑or ↓ and press ENTER key.

After the selection is made, the following menu is displayed.

3URJUDP/4D 6HWWLQJ'()67' SLQV95 95 95 

✼✼,QOLQH✼✼

>&DUULDJH:LGWK@

 ! FROXPQ

FROXPQ

USASTD -- RUSSIA

EURSTD -- ITALIC

Rev. A

Page 92

LQ-670 Service Manual

9. In this menu, Select 106 column by moving the cursor with the ↑or ↓ and press ENTER key. After the selection is made, the following menu is displayed.

3URJUDP/4D 6HWWLQJ'()67' SLQV95 95 95 

✼✼,QOLQH✼✼

>0DLQ0(18@

%L'$GMXVW (QYHORSH

 !))SDSHU 68%0(18

$+RUL]RQWDO 3&XWVKHHW $3&XWVKHHW

10. In this menu, select FF paper by moving the cursor with the ↑or ↓ and press ENTER key. Perform the test printing for one sheet of the continuous paper.

11. After setting, go to Bi-D adjustment or complete the program regularly and turn off the printer.

CAUTION

Since the setting values are registered in EEPROM of the main board after the test printing, make

;

sure to perform test printing after adjustment program is completed.

;

If the wrong destination is input, the correct printer performance can not be guaranteed.

;

Since this printer uses the secondary switching and AC voltage is charged on the primary side, make sure to plug off the AC cable when you pull in or out the interface.

;

Since GWBASIC system and all other necessary files are included in the disk of the adjustment program, load from the disk when you perform adjustment.

;

In the adjustment program, other items which is not necessary for this adjustment are also included. However, we can not guarantee the normal printer operation if the item, which is not on the manual, is selected.

Rev. A

Page 93

Chapter 4 Adjustments

4.2.3 Bi-d Adjustment

Bi-d adjustment can be done either by the panel operation or adjustment program. This section describes Bi-d adjustment by the program.

1. Plug off the cable of the printer from the AC socket.

2. Connect the printer and the PC by the parallel interface.

3. Plug in the cable of the printer and turn on the printer.

4. Set the release lever to the tractor side and set the 12-inch continuous paper(1p).

5. Load “GWBASIC” and execute the adjus tment program. After s etting des tination and printing, f ollowing main menu is displayed.

3URJUDP/4D 6HWWLQJ'()67' SLQV95 95 95 

✼✼,QOLQH✼✼

>0DLQ0(18@

 !%L'$GMXVW (QYHORSH

 ))SDSHU 68%0(18

$+RUL]RQWDO 3&XWVKHHW $3&XWVKHHW

6. Select selection is made, the following menu is displayed.

Bi-D Adjust

by moving the moving the cursor with the ↑or ↓ and press ENTER key. After the

%L'$GMXVWPHQW!

0RGH  0RGH  0RGH 

&DQFHO3ULQW6SHHG9DOXH:ULWH'HIDXOW

>(6&@>63$&(@>↑↓@>←→@>5(7@>+20(@

7. Select Mode 1 by moving the cursor with the ↑or ↓ and press SPACE key. 4 lines of Bi-D pattern will be printed.

Under 0.1mm

Figure 4-2. Bi-D Adjustment

Rev. A

Page 94

LQ-670 Service Manual

8. If 4 lines are not straight vertically, you can adjust by changing setting values with ← or→ key. If the second and fourth lines are printed right side, compared with the first and third lines, change

the setting value by pressing ← key. Then, printing pattern with the new setting will be printed by pressing SPACE key.

If the second and fourth lines are printed left side, compared with the first and third lines, change

the setting value by pressing → key. Then, printing pattern with the new setting will be printed by pressing SPACE key. Repeat the procedure until the 4 lines line up vertically and Bi-d dispersion becomes under

0.1mm. After adjustment of Mode 1 is completed, repeat the same procedure for Mode 2 and Mode 4.

9. After adjustment is completed at each mode, the setting value is registered by pressing ENTER key.

10. To exit the program, press ESC and complete the program regularly and turn off the printer.

CAUTION

Since the setting values are registered in EEPROM of the main board when the printer is turned

;

off, make sure to turn off the printer after adjustment program is completed.

;

Since this printer uses the secondary switching and AC voltage is charged on the primary side, make sure to plug off the AC cable when you pull in or out the interface.

;

Since GWBASIC system and all other necessary files are included in the disk of the adjustment program, load from the disk when you perform adjustment.

;

Rev. A

Page 95

Chapter 5

Troubleshooting

5.1 Overview................................................................................................................5-1

5.2 Unit Level Troubleshooting.................................................................................5-2

5.3 Repairing the Power Supply Circuit Board......................................................5-11

5.4 Repairing the Main Board..................................................................................5-14

5.5 Repairing the Printer Mechanism......................................................................5-17

Page 96

LQ-670 Service Manual

5.1 Overview

This chapter contains flowcharts and checkpoint tables to help you troubleshoot the printer. Flowcharts let you isolate a faulty unit based on abnormal symptoms. The checkpoint tables let you identify the faulty part or unit by checking the values or ranges listed for each component.

Units Exchange

Repair of the primary side

Repair of the secondary side

Repairing Power Supply Board

Repairing Main Board

Repairing Printer Mechanism

END

Figure 5-1. Troubleshooting Process Flowchart

The first step of repairing is the unit exchange. Servicemen need to find defective units and replace them. After repairing, it is necessary to perform appropriate adjustments (Refer to Chapter 4 for Adjustment) and Lubrication (Refer to Chapter 6 for Maintenance). The table below shows tools required for the troubleshooting.

Table 5-1. Tools Required for the Troubleshooting

Name Specification

Oscilloscope Recommended more than 50MHz Multimeter Analog is OK, but Digital multimeter is recommended.

Also, this printer has self-diagnosis function which beeps when the printer detects error conditions. Following table shows error conditions and buzzer sounds to indicate errors.

Table 5-2. Indicators and Buzzer

Indicator

Error Condition Pause Paper Out Tear Off/

Bin Paper out error On On --- --- --Paper Jam error On Blink --- --- --Paper eject error On Blink --- --- --Head Hot Blink --- --- --- --- ---

Fatal error Blink ---

Note)

Rev. A

❍ indicates that the beep sounds for 100ms with an interval of 100ms.

● indicates that the beep sounds for 500ms with an interval of 100ms.

Condensed Font Buzzer

❍X3

●X5 ❍X3

5-1

Page 97

LQ-670 Service Manual

5.2 Unit Level Troubleshooting

You may be able to identify the defective unit just from the symptom displayed. The table below provides the symptoms for a num ber of failures. Onc e you identify the problem, refer to the flowchart listed in the right-hand column of the table below to determine the cause of the problem.

Table 5-3. Symptoms and Problem Descriptions

Symptom Problem Description Flowchart No.

The printer does not operate even when the power is turned on. Printer goes to the error state when the power is turned on.

Abnormal printing during the self-test

Abnormal paper feed

Control panel does not work correctly

Abnormal operation when the power is on.

•LED of the control panel does not indicate.

•Mechanism does not perform the initialization.

•One or more than two LEDs are on or blinking,

indicating error.

•After initialization, the printer goes to error state.

•No printing operation.

•One or more than two dots are missing.

•Poor printing quality.

•Printer does not feed a paper at all.

•Abnormal printing area.

•Paper Jam often occurs.

•The printer does not response to the switch

operation correctly.

•Panel buttons do not work.

•Abnormal indication on the control panel

•Self test is normal, but the data from the PC is

not printed correctly.

•Printer does not print.

•PC indicates error when the printer operates.

Flowchart 1

Flowchart 2

Flowchart 3

Flowchart 4

Flowchart 5

Flowchart 6

Rev. A

Page 98

[Printer does not work when the power is turned on ]

LQ-670 Service Manual

Go back to START

Is the power supply voltage normal?

YES

Is the

fuse on the

power supply

board dis-

connected?

YES

Replace the fuse F1 and remove all output connectors.

Does the

fuse get dis-

connected when

power is turned

on?

Input normal power supply.

Is output voltage of

the power supply board normal?(Refer to Table 5-4)

Replace the main control board.

YES

Normal?

NONO

Replace the printer Mechanism.

Is the voltage

normal?

YES

Replace the power

YES

Normal?

supply board.

Normal?

YES

Is the main control board replaced?

YES

END

Figure 5-2. Flowchart 1

Rev. A

Page 99

LQ-670 Service Manual

[Printer goes error conditions when the power is turned on]

START

Select an error type.(Refer to Table5-2)

YES

Is it fatal error?

YES

Is power

supply

normal?

Is there any

other error?

Go to other trouble shooting

Foreign objects on or under the CR gudie shaft? If so, remove it.

Is +42Vof CN2 in the power supplyboard normal?

Is detector caused by foreign objects, such as jammed

YES

paper? If so, remove it.

YES

Normal?

Replace the main board

Normal?

YES

More than +40V

YES

Replace the power supply board

Turn off the

power, move the carriage manually.

Normal?

YES

Replace the main board

Normal?

YES

Does the

carriage move

smoothly?

YES

Replace the printer mechanism

YES

Normal?

Replace the main board

YES

Normal?

YES

Normal?

Replace the printer mechanism

YES

Normal?

Replace the power supply board

END

Replace the power supply board

END

Figure 5-3. Flowchart 2

Rev. A

Page 100

[Abnormal printing during the self-test]

Perform sel-test

LQ-670 Service Manual

Are all

the dots printed

OK?

YES

Does

the printer

print?

YES

printing result

abnormally

dark or light?

Print somethingelse?

Go to other trouble shooting.

Does

the carriage

move?

YES

Reset the adjust lever.

YES

Normal?

Perform platen gap adjustment

Normal?

YES

Measure the coil resistance of the print head.

YES

END

YES

coil resistance

normal?

YES

Replace the main board.

Normal?

Replace the print head.

Normal?

YES

END

Figure 5-4. Flowchart 3

Replace the printer mechanism.

END

Rev. A

Epson LQ 670 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

PRECAUTIONS

REVISION SHEET

TABLE OF CONTENTS

Product Descriptions

1.1 Specifications

Operating Principles

Disassembly and Assembly

Adjustments