Epson Stylus Color C70, Stylus Color C80 Service Manual

Download

Page 1

EPSON Stylus Color C70/C80

Color Inkjet Printer

SEIJ01-004

SERVICE MANUAL

Page 2

Notice

mechanical, photocopying, or otherwise, without the prior written permission of SEIKO EPSON CORPORATION.

 All effort have been made to ensure the accuracy of the contents of this manual. However, should any errors be detected, SEIKO EPSON would

greatly appreciate being informed of them.

 The contents of this manual are subject to change without notice.

 All effort have been made to ensure the accuracy of the contents of this manual. However, should any errors be detected, SEIKO EPSON would

greatly appreciate being informed of them.

 The above not withstanding SEIKO EPSON CORPORATION can assume no responsibility for any errors in this manual or the consequences

thereof.

EPSON is a registered trademark of SEIKO EPSON CORPORATION.

General Notice: Other product names used herein are for identification purpose only and may be trademarks or registered trademarks of their

respective owners. EPSON disclaims any and all rights in those marks.

Imaging & Information Product Division TPCS Quality Assurance Center TPCS Department

Page 3

PRECAUTIONS

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

DANGER Signals a precaution which, if ignored, could result in serious or fatal personal injury. Great caution should be exercised in performing

procedures preceded by DANGER Headings.

WARNING Signals a precaution which, if ignored, could result in damage to equipment.

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

DANGER

1. ALWAYS DISCONNECT THE PRODUCT FROM THE POWER SOURCE AND PERIPHERAL DEVICES PERFORMING ANY MAINTENANCE OR REPAIR PROCEDURES.

2. NO WORK SHOULD BE PERFORMED ON THE UNIT BY PERSONS UNFAMILIAR WITH BASIC SAFETY MEASURES AS DICTATED FOR ALL ELECTRONICS TECHNICIANS IN THEIR LINE OF WORK.

3. WHEN PERFORMING TESTING AS DICTATED WITHIN THIS MANUAL, DO NOT CONNECT THE UNIT TO A POWER SOURCE UNTIL INSTRUCTED TO DO SO. WHEN THE POWER SUPPLY CABLE MUST BE CONNECTED, USE EXTREME CAUTION IN WORKING ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS.

4. WHEN DISASSEMBLING OR ASSEMBLING A PRODUCT, MAKE SURE TO WEAR GLOVES TO AVOID INJURIER FROM METAL PARTS WITH SHARP EDGES.

WARNING

1. REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON CERTIFIED REPAIR TECHNICIAN.

2. MAKE CERTAIN THAT THE SOURCE VOLTAGES IS THE SAME AS THE RATED VOLTAGE, LISTED ON THE SERIAL NUMBER/RATING PLATE. IF THE EPSON PRODUCT HAS A PRIMARY AC RATING DIFFERENT FROM AVAILABLE POWER SOURCE, DO NOT CONNECT IT TO THE POWER SOURCE.

3. ALWAYS VERIFY THAT THE EPSON PRODUCT HAS BEEN DISCONNECTED FROM THE POWER SOURCE BEFORE REMOVING OR REPLACING PRINTED CIRCUIT BOARDS AND/OR INDIVIDUAL CHIPS.

4. IN ORDER TO PROTECT SENSITIVE MICROPROCESSORS AND CIRCUITRY, USE STATIC DISCHARGE EQUIPMENT, SUCH AS ANTI-STATIC WRIST STRAPS, WHEN ACCESSING INTERNAL COMPONENTS.

5. DO NOT REPLACE IMPERFECTLY FUNCTIONING COMPONENTS WITH COMPONENTS WHICH ARE NOT MANUFACTURED BY EPSON. IF SECOND SOURCE IC OR OTHER COMPONENTS WHICH HAVE NOT BEEN APPROVED ARE USED, THEY COULD CAUSE DAMAGE TO THE EPSON PRODUCT, OR COULD VOID THE WARRANTY OFFERED BY EPSON.

Page 4

About This Manual

This manual describes basic functions, theory of electrical and mechanical operations, maintenance and repair procedures of the printer. The instructions and procedures included herein are intended for the experienced repair technicians, and attention should be given to the precautions on the preceding page.

Manual Configuration

This manual consists of six chapters and Appendix.

CHAPTER 1. PRODUCT DESCRIPTIONS

Provides a general overview and specifications of the product.

CHAPTER 2. OPERATING PRINCIPLES

Describes the theory of electrical and mechanical operations of the product.

CHAPTER 3. TROUBLESHOOTING

Describes the step-by-step procedures for the troubleshooting.

CHAPTER 4. DISASSEMBLY / ASSEMBLY

Describes the step-by-step procedures for disassembling and assembling the product.

CHAPTER 5. ADJUSTMENT

Provides Epson-approved methods for adjustment.

CHAPTER 6. MAINTENANCE

Provides preventive maintenance procedures and the lists of Epson-approved lubricants and adhesives required for servicing the product.

APPENDIX Provides the following additional information for

reference:

• Connector pin assignments

• Electric circuit boards components layout

• Electrical circuit boards schematics

• Exploded diagram & Parts List

Symbols Used in this Manual

Various symbols are used throughout this manual either to provide additional information on a specific topic or to warn of possible danger present during a procedure or an action. Be aware of all symbols when they are used, and always read NOTE, CAUTION, or WARNING messages.

Indicates an operating or maintenance procedure, practice or condition that is necessary to keep the product’s quality.

Indicates an operating or maintenance procedure, practice, or condition that, if not strictly observed, could result in damage to, or destruction of, equipment.

May indicate an operating or maintenance procedure, practice or condition that is necessary to accomplish a task efficiently. It may also provide additional information that is related to a specific subject, or comment on the results achieved through a previous action.

Indicates an operating or maintenance procedure, practice or condition that, if not strictly observed, could result in injury or loss of life.

Indicates that a particular task must be carried out according to a certain standard after disassembly and before re-assembly, otherwise the quality of the components in question may be adversely affected.

A D J U S T M E N T

R E Q U I R E D

C A U T I O N

C H E C K

P O I N T

W A R N I N G

Page 5

Revision Status

Revision Issued Date Description

A July 31, 2001 First Release

Page 6

CONTENTS

Chapter 1 PRODUCT DESCRIPTION

1.1 FEATURES ....................................................................................................... 10

1.2 SPECIFICATIONS .......................................................................................... 11

1.2.1 Physical Specification ................................................................................ 11

1.2.2 Printing Specification ................................................................................ 11

1.2.3 Paper Feeding ............................................................................................ 13

1.2.4 Input Data Buffer ....................................................................................... 13

1.2.5 Electric Specification ................................................................................. 13

1.2.6 Environmental Condition ........................................................................... 14

1.2.7 Reliability .................................................................................................. 14

1.2.8 Safety Approvals ....................................................................................... 14

1.2.9 Acoustic Noise ........................................................................................... 14

1.2.10 CE Marking ............................................................................................. 14

1.3 INTERFACE ..................................................................................................... 15

1.3.1 Parallel Interface ........................................................................................ 15

1.3.2 Parallel Interface (Reserve Channel) ......................................................... 17

1.3.3 USB Interface ............................................................................................ 18

1.3.4 Prevention Hosts of Data Transfer Time-out ............................................. 19

1.3.5 Interface Selection ..................................................................................... 19

1.3.6 IEEE1284.4 Protocol ................................................................................. 19

1.3.7 Printer Language and Emulation ............................................................... 20

1.3.7.1 Control codes ..................................................................................... 20

1.3.7.2 EPSON D4 control channel commands ............................................ 21

1.4 OPERATOR CONTROLS .............................................................................. 24

1.4.1 Operate Switch ........................................................................................... 24

1.4.2 Control Panel ............................................................................................. 24

1.4.2.1 Switches ............................................................................................. 24

1.4.2.2 Indicators ........................................................................................... 24

1.4.3 Panel Functions .......................................................................................... 25

1.4.4 Printer Condition and Panel Status ............................................................ 26

1.4.5 Printer setting mode (Stylus COLOR C80 only) ....................................... 27

1.4.5.1 Default setting mode ......................................................................... 27

1.4.5.2 Print head alignment mode ................................................................ 28

1.4.6 Printer Initialization ................................................................................... 28

1.4.7 Errors ......................................................................................................... 29

1.5 PAPER ............................................................................................................... 30

1.5.1 Paper Handling .......................................................................................... 30

1.5.2 Paper Specification .................................................................................... 30

1.5.2.1 Cut Sheet ........................................................................................... 30

1.5.2.2 Envelope ............................................................................................ 30

1.5.2.3 Index Card ......................................................................................... 30

1.5.2.4 EPSON special media ....................................................................... 31

1.5.3 Printing Area .............................................................................................. 32

1.5.3.1 Cut Sheet ........................................................................................... 32

1.5.3.2 Envelopes .......................................................................................... 33

1.6 INK CARTRIDGE ........................................................................................... 34

1.6.1 Black Ink Cartridge ................................................................................... 34

1.6.2 Color Ink Cartridge .................................................................................... 34

Chapter 2 Operating Principles

2.1 Overview ............................................................................................................ 36

2.1.1 Printer Mechanism ..................................................................................... 36

2.1.2 Printhead .................................................................................................... 37

2.1.2.1 Printing Process ................................................................................. 37

2.1.2.2 Printing Method ................................................................................. 38

2.1.3 Carriage Mechanism .................................................................................. 39

2.1.4 Paper Feeding Mechanism ......................................................................... 40

2.1.5 Paper Loading Mechanism (ASF Unit) ..................................................... 41

2.1.6 Ink System Mechanism ............................................................................. 49

2.1.6.1 Pump Unit & Wiper mechanism ....................................................... 49

2.1.6.2 Capping Mechanism .......................................................................... 50

2.2 Electrical Circuit Operating Principles .......................................................... 51

Page 7

2.2.1 C424 PSB/PSE board ................................................................................ 51

2.2.2 C424 MAIN-B Board ................................................................................ 54

2.2.2.1 Main elements ................................................................................... 55

2.2.2.2 Printhead Driver Circuit .................................................................... 56

2.2.2.3 CR / PF Motor (PF/ PUMP/ ASF Motor) Driver Circuit .................. 57

2.2.2.4 Reset Circuit ...................................................................................... 57

2.2.2.5 EEPROM Control Circuit ................................................................. 58

2.2.2.6 Sensor Circuit .................................................................................... 58

Chapter 3 Troubleshooting

3.1 Overview ............................................................................................................ 61

3.1.1 Communication Error ................................................................................ 62

3.1.2 Too Late Throughput ................................................................................. 62

3.1.3 Status Monitor does not operate ................................................................ 63

3.1.4 Troubleshooting with LED Error Indications ............................................ 64

3.1.4.1 Remedy when a paper out, double feed or paper jam error

occurs ................................................................................................. 66

3.1.4.2 Remedies for No I/C and Ink Out Errors .......................................... 71

3.1.4.3 Countermeasures when an Ink Low indication appears. ................... 75

3.1.4.4 Remedies for the Maintenance Error ................................................. 75

3.1.4.5 Remedies for Fatal Error ................................................................... 76

3.1.5 Isolating the Faulty Part on the Power Supply Board ................................ 79

3.1.6 Isolating the Faulty Part according to the Phenomenon ............................ 82

3.1.6.1 PF Motor Driver Abnormal 1 ............................................................ 83

3.1.6.2 ASF Driver Abnormal 1 .................................................................... 84

3.1.6.3 Unexpected Ink Out Error 1 (During Print Operation) ..................... 85

3.1.6.4 PF Motor Driver Abnormal 2 ............................................................ 86

3.1.6.5 Carriage Operation Abnormal ........................................................... 87

3.1.6.6 Dot Missing 1 .................................................................................... 89

3.1.6.7 Dot Missing 2 .................................................................................... 90

3.1.6.8 Dot Missing 3 .................................................................................... 92

3.1.6.9 Repair Handling Failure .................................................................... 93

3.1.6.10 ASF Driver Abnormal 2 .................................................................. 93

3.1.6.11 CR Motor Operation Abnormal ...................................................... 95

Chapter 4 Disassembly and Assembly

4.1 Overview ............................................................................................................ 97

4.1.1 Precautions ................................................................................................. 97

4.1.2 Tools .......................................................................................................... 98

4.1.3 Work Completion Check ........................................................................... 99

4.1.4 Screws ...................................................................................................... 100

4.2 Disassembly ..................................................................................................... 101

4.2.1 Housing Removal .................................................................................... 102

4.2.1.1 Printer Cover Removal .................................................................... 102

4.2.1.2 Stacker Assembly Removal ............................................................ 102

4.2.1.3 Upper Case Removal ....................................................................... 103

4.2.1.4 Rear Cover Removal ....................................................................... 104

4.2.1.5 Middle Housing Removal ............................................................... 104

4.2.1.6 Printer Mechanism Unit Removal ................................................... 105

4.2.1.7 Waste Ink Pad Removal .................................................................. 108

4.2.2 ASF Unit Removal .................................................................................. 108

4.2.3 Main Board Assembly Removal .............................................................. 110

4.2.4 Power Supply Board Assembly Removal ............................................... 111

4.2.5 Print Head / Ink System Unit Removal ................................................... 113

4.2.6 Carriage Unit / CR Guide Shaft Removal ............................................... 116

4.2.7 Front Paper Guide Removal .................................................................... 121

4.2.8 EJ Roller Unit Removal ........................................................................... 122

4.2.9 Motor Removal ........................................................................................ 123

4.2.9.1 PF Motor Removal .......................................................................... 123

4.2.9.2 CR Motor Removal ......................................................................... 124

4.2.10 PE Actuator Removal ............................................................................ 125

4.2.10.1 Encoder Unit Board Removal ....................................................... 125

4.2.11 PF Roller Unit Removal ........................................................................ 126

4.2.12 ASF Unit Disassembly .......................................................................... 127

4.2.12.1 ASF Assembly Points .................................................................... 132

4.2.13 Rotary Encoder Removal ....................................................................... 134

Chapter 5 Adjustment

5.1 Overview .......................................................................................................... 138

5.1.1 Conditions for Each Adjustment ............................................................. 138

5.2 Adjustment ...................................................................................................... 140

5.2.1 Setup the Adjustment Program ................................................................ 140

5.2.2 Head ID Input .......................................................................................... 141

5.2.3 Ink Charge ............................................................................................... 143

5.2.4 Head Angle Adjustment. ......................................................................... 144

5.2.5 Bi-D Adjustment ...................................................................................... 149

5.2.6 PF Adjustment ......................................................................................... 152

Page 8

5.2.7 USB ID Readout (Checking) ................................................................... 155

5.2.7.1 Possible to Readout the Original USB ID (CASE 1) ...................... 155

5.2.7.2 Impossible to Readout the Original USB ID (CASE 2) .................. 157

5.2.8 EEPROM Initialization ............................................................................ 157

5.2.9 Platen Gap Adjustment (Mechanism Adjustment) .................................. 159

5.2.10 Head Cleaning Operation ...................................................................... 162

5.2.11 Protection Counter Clear (and Check) ................................................... 163

5.2.12 Top Margin Adjustment ........................................................................ 164

5.2.13 First Dot Position Adjustment ............................................................... 166

Chapter 6 Maintenance

6.1 Overview .......................................................................................................... 170

6.1.1 Cleaning ................................................................................................... 170

6.1.2 Service Maintenance ................................................................................ 171

6.1.3 Lubrication and Adhesion ........................................................................ 172

6.1.4 Lubrication the Carriage Guide Shaft ...................................................... 173

Chapter 7 Appendix

7.1 Connector Summary ...................................................................................... 183

7.1.1 Major Component Unit ............................................................................ 183

7.1.2 EEPROM Address Map ........................................................................... 187

7.1.3 CSIC Address Map .................................................................................. 193

7.2 Component Layout ......................................................................................... 196

7.3 Exploded Diagram .......................................................................................... 198

7.4 Parts List ......................................................................................................... 208

7.5 Electrical Circuits ........................................................................................... 213

Page 9

CHAPTER

PRODUCT DESCRIPTION

Page 10

EPSON Stylus COLOR C70/C80 Revision A

PRODUCT DESCRIPTION FEATURES 10

1.1 FEATURES

The major features of EPSON color inkjet printers EPSON Stylus COLOR C70 / C80 are:

 High Color Print Quality

 2880 (H) X 720 (V) dpi printing  4 Color Printing (YMCK)

 Built-in Auto Sheet Feeder

 Holds 150 cut-sheets (64g/m

)

 Holds 15 envelopes

 Built-in 2 I/F

 Bi-directional parallel I/F (IEEE-1284 level 1 device)  USB

 Windows/Macintosh exclusive (Stylus COLOR C70 only )

 1 scalable fonts, 2 LQ fonts (Stylus COLOR C80 only )

 Roman (scalable)

 Roman, Courier (LQ)

 Accessory

 Enclosed parts

User’s manual: 1

Driver disk: 1

Black ink cartridge: 1

Cyan ink cartridge: 1

Magenta ink cartridge: 1

Yellow ink cartridge: 1

Power cord: 1 (220-240 version)

Figure 1-1. Product’s external view

Page 11

EPSON Stylus COLOR C70/C80 Revision A

PRODUCT DESCRIPTION SPECIFICATIONS 11

1.2 SPECIFICATIONS

This section covers specifications of the printers.

1.2.1 Physical Specification

 Weight: 5.8kg (without the ink cartridges)

 Dimension: 452 mm (W) x 562 mm (D) x 295 mm (H)

1.2.2 Printing Specification

 Print Method

 On demand ink jet

 Nozzle Configuration

 Monochrome 180 nozzles

 Color 60 nozzles x 3 (Cyan, Magenta, Yellow)

 Print Direction

 Bi-direction with logic seeking

 Print Speed & Printable Columns*

 Control Code*

 ESC/P2 expanded raster graphics code

 EPSON Remote command

 Character Tables*

(Stylus COLOR C70)

 2 international character sets:

- PC 437 (US Standard Europe)

- PC 850 (Multilingual)

NOTE: But user cannot selsct.

PC437 is the default setting.

Table 1-1. Character Mode (Stylus COLOR C70)

Character Pitch Printable Columns LQ Speed

10 CPI (Pica) 80 238 CPS

Paper Ejecting Direction

Table 1-2. Character Mode (Stylus COLOR C80)

Character Pitch Printable Column LQ Speed

10 CPI (Pica) 80 238 CPS

12 CPI (Elite) 96 285 CPS

15 CPI 120 357 CPS

17 CPI (Pica condensed) 137 406 CPS

20 CPI (Elite condensed) 160 476 CPS

Table 1-3. Raster Graphics Mode

Horizontal Resolution

Printable Area Available Dot CR Speed

180 dpi 209.8mm(8.26 inch) 1488

762/482.6 mm/s

30/19 IPS

360 dpi 209.8mm(8.26 inch) 2976

571.5/482.6 mm/s

22.5/19 IPS

720 dpi 209.8mm(8.26 inch) 5952

482.6 mm/s 19 IPS

Page 12

EPSON Stylus COLOR C70/C80 Revision A

PRODUCT DESCRIPTION SPECIFICATIONS 12

(Stylus COLOR C80)



legal and 14 international character sets

(38 character tables)

 Typeface*

(Stylus COLOR C70)

 Bit map LQ font:

-EPSON Courier 10 CPI

(Stylus COLOR C80)

 Bit map LQ font:

-EPSON Roman 10 CPI, 12 CPI, 15 CPI, Proportional

-EPSON Courier 10 CPI, 12 CPI, 15 CPI

 Scalable font

-EPSON Roman 0.5 pt., 8 pt. - 32pt.(every 2 pt.)

NOTE: Each Typeface has 4 variations as the following example of EPSON

Roman.

-EPSON Roman normal

-EPSON Roman bold

-EPSON Roman italic

-EPSON Roman bold italic

NOTE: (*)Do not mention to the user’s manual.



Character table and Typeface (Stylus COLOR C80 only )

NOTE: (*) Do not describe in manual. These character tables can’t select in the

Default setting mode.

Table 1-4. Character table and Typeface

Character table

Bit map font Scalable font

EPSON Roman EPSON Courier

EPSON Roman

DOS version

Italic table PC 437(US Standard Europe) PC 850 (Multilingual) PC 860(Portuguese) PC 861(Icelandic) PC 865(Nordic) BRASCII Abicomp Roman 8 ISO Latin 1 PC 858 ISO 8859-15

supported supported

PC 437 Greek PC 852(East Europe) PC 853(Turkish) PC 855(Cyrillic) PC 857(Turkish) PC 866(Russian) PC 869(Greek) MAZOWIA(Poland) Code MJK(CSFR) ISO 8859-7(Latin/Greek) ISO Latin 1T(Turkish) Bulgaria(Bulgaria) PC 774 Estonia ISO 8859-2(ISO Latin 2) PC 866 LAT PC 866 UKR

supported supported

PC APTEC(Arabic) PC 708(Arabic) PC 720(Arabic) PC AR864(Arabic)

EPSON Roman

not supported

Hebrew 7

Hebrew 8

PC 862(Hebrew)

EPSON Roman

Page 13

EPSON Stylus COLOR C70/C80 Revision A

PRODUCT DESCRIPTION SPECIFICATIONS 13

1.2.3 Paper Feeding



Feeding Method



Friction feed with ASF

 Paper Path

 Cut-sheet ASF (Top entry Front out)

 Feed Speed

 59.994 mm/sec (2.36 inch/sec) (Normal, continuous feed)

 114.3 mm/sec (4.5 inch/sec) (Fast, continuous feed)

1.2.4 Input Data Buffer

(Stylus COLOR C70)

 32KB

(Stylus COLOR C80)

 256KB

1.2.5 Electric Specification

[120V Version]

Rated Voltage: AC120V Input Voltage Range: AC99∼132V Rated Frequency Range: 50∼ 60Hz Input Frequency Range: 49.5∼ 60.5Hz Rated Current: 0.6A (max. 1.2A) Power Consumption: Approx. T.B.D (ISO 10561 Letter Pattern)

Approx. 5W in standby mode Energy Star compliant

Insulation Resistance: 10 M ohms min.

(between AC line and chassis, DC 500V)

Dielectric Strength: AC 1000V rms. 1 minute or AC 1200V rms. 1second

(between AC line and chassis)

[220 ∼ 240V Version]

Rated Voltage: AC220V∼240V Input Voltage Range: AC198∼264V Rated Frequency Range: 50∼60Hz Input Frequency Range: 49.5∼60.5Hz Rated Current: 0.3A (max. 0.6A) Power Consumption: Approx. T.B.D (ISO10561 Letter Pattern)

Approx. 5W in standby mode Energy Star compliant

Insulation Resistance: 10 M ohms min.

(between AC line and chassis, DC 500V)

Dielectric Strength: AC 1500V rms. 1 minute

(between AC line and chassis)

Page 14

EPSON Stylus COLOR C70/C80 Revision A

PRODUCT DESCRIPTION SPECIFICATIONS 14

1.2.6 Environmental Condition



Temperature



Operating: 10 to 35°C (*

 Non-operating: -20 to 40°C

(*1)

1 month at 40°C and 120 hours at 60°C

 Humidity

 Operating: 20 to 80% RH

(*2, *3)

 Non-operating: 5 to 85% RH

(*1, *2)

 Resistance to Shock

 Operating: 1G, within 1 ms

 Non-operating: 2G, within 2 ms

(*1)

 Resistance to Vibration

 Operating: 0.15G

 Non-operating: 0.50G

(*1)

NOTE: (*1) with shipment container

NOTE: (*2) without condensation

NOTE: (*3) Condition is as following figure

Figure 1-2. Temperature/Humidity Range

1.2.7 Reliability

Total Print Volume: 75,000 pages (A4, Letter)

Print Head Life: 3000 million dots/nozzle

1.2.8 Safety Approvals

[120V Version]

Safety Standards: UL1950

CSA 22.2 No.950

EMI: FCC part 15 subpart B Class B

CSA C108.8 Class B

[220∼240V Version]

Safety Standards: EN60950 (VDE)

EMI: EN55022 (CISPR Pub.22) Class B

AS/NZS 3548 Class B

1.2.9 Acoustic Noise

Level: Approx. 42dB(A) (According to ISO 7779)

1.2.10 CE Marking

[220∼240V Version]

Low Voltage Directive 73/23/EEC: EN60950 EMC Directive 89/336/EEC: EN55022 Class B

EN55024 EN61000-3-2 EN61000-3-3

273035

Temperature (°C)

Humidity (%)

Page 15

EPSON Stylus COLOR C70/C80 Revision A

PRODUCT DESCRIPTION INTERFACE 15

1.3 INTERFACE

The EPSON Stylus COLOR C70 / C80 provide USB and parallel interface as standard.

1.3.1 Parallel Interface

Transmission Mode: 8 bit parallel, IEEE-1284 compatibility mode Synchronization: By STROBE pulse Handshaking: By BUSY and ACKNLG signal Signal Level: TTL compatible level Adaptable Connector: 57-30360 (amphenol) or equivalent

BUSY signal is set high before setting either -ERROR low or PE high and held high until all these signals return to their inactive state.

BUSY signal is at high level in the following cases.

 During data entry (see Data transmission timing)

 When input data buffer is full

 During -INIT signal is at low level or during hardware initialization

 During printer error (see -ERROR signal)

 When the parallel interface is not selected

ERROR signal is at low level when the printer is in one of the following states.

 Printer hardware error (fatal error)

 Paper-out error

 Paper-jam error

 Ink-out error

 Maintenance request

 Double feed

PE signal is at high level during paper-out error.

Figure 1-3. Data Transmission Timing

NOTE: (*1) Rise and fall time of every output signal.

NOTE: (*2) Rise and fall time of every input signal.

Table 1-5. Parameter

Parameter Minimum Maximum

tsetup 500ns -

thold 500ns -

tstb 500ns -

tready 0 -

tbusy - 500ns

tt-out (*

- 120ns

tt-in (*

- 200ns

treply 0 -

tack 500ns 10us

tnbusy 0 -

tnext 0 -

DATA

data byte n

data byte n+1

-STROBE

BUSY

-ACKNLG

hold

setup

stb

ready

busy

ack

nbusy

Page 16

EPSON Stylus COLOR C70/C80 Revision A

PRODUCT DESCRIPTION INTERFACE 16

NOTE: (*) A low logic level on the Logic H signal is 2.0V or less when the

printers powered off and this signal is equal or exceeding 3.0V when the printer is powered on. The receiver shall provide an impedance equivalent to 7.5K ohm to ground.

NOTE: In/Out refers to the direction of signal flow from the printer’s point of

view.

Table 1-6. Typical Time of tack

Parallel I/F Mode Typical Time of tack

High Speed 0.5us

Normal Speed 2us

Table 1-7. Signal Level: TTL Compatible (IEEE-1284 level 1 device)

Parameter Minimum Maximum Condition

VOH* - 5.5V

VOL* -0.5V -

IOH* - 0.32mA VOH = 2.4V

IOL* - 12mA VOL = 0.4V

CO - 50pF

VIH - 2.0V

VIL 0.8V -

IIH - 0.32mA VIH = 2.0V

IIL - 12mA VIL = 0.8V

CI - 50pF

Table 1-8. Connector Pin Assignment and Signals

Pin No. Signal Name

Return

GND Pin

In/Out Functional Description

1 -STROBE 19 In

The strobe pulse. Read-in of data is performed at the falling edge of this pulse.

2 DATA 0 20 In The DATA 0 through DATA 7 signals represen t

data bits 0 to 7, respectively. Each signal is at high level when data is logical 1 and low level when data is logical 0.

3 DATA 1 21 In

4 DATA 2 22 In

The DATA 0 through DATA 7 signals represe nt data bits 0 to 7, respectively. Each signal is at high level when data is logical 1 and low level when data is logical 0.

5 DATA 3 23 In

6 DATA 4 24 In

7 DATA 5 25 In

8 DATA 6 26 In

9 DATA 7 27 In

10 -ACKNLG 28 Out

This signal is a negative pulse indicating that the printer can accept data again.

11 BUSY 29 Out

A high signal indicates that the printer cannot receive data.

12 PE 28 Out A high signal indicates paper-out error.

13 SLCT 28 Out

Always at high level when the printer is powered on.

14 -AFXT 30 In Not used.

31 -INIT 30 In

The falling edge of a negative pulse or a low signal on this line causes the printer to initialize. Minimum 50 us pulse is necessary.

32 -ERROR 29 Out A low signal indicates printer error condition.

36 -SLIN 30 In Not used.

18 Logic H - Out Pulled up to +5V via 3.9 K ohm resistor.

35 +5V - Out Pulled up to +5V via 3.3K ohm resistor.

17 Chassis GND - - Chassis GND

16,33, 19-30

GND - - Signal GND

15,34 NC - - Not connected

Table 1-8. Connector Pin Assignment and Signals (continued)

Pin No. Signal Name

Return

GND Pin

In/Out Functional Description

Page 17

EPSON Stylus COLOR C70/C80 Revision A

PRODUCT DESCRIPTION INTERFACE 17

1.3.2 Parallel Interface (Reserve Channel)

Transmission Mode: IEEE-1284 nibble mode Adaptable Connector: See forward channel Synchronization: Refer to the IEEE-1284 specification Handshaking: Refer to the IEEE-1284 specification Data Trans. Timing: Refer to the IEEE-1284 specification Signal Level: IEEE-1284 level 1 device

See forward channel

NOTE: In/Out refers to the direction of signal flow from the printer’s point of

view.

Table 1-9. Connector Pin Assignment and Signals

Pin No. Signal Name

Return

GND Pin

In/Out Functional Description

1 Host Clk 19 In Host clock signal.

2 DATA 0 20 In

The DATA 0 through DATA 7 signals represent data bits 0 to 7, respectively. Each signal is at high level when data is logical 1 and low level when data is logical 0. These signals are used to transfer the 1284 extensibility request values to the printer.

3DATA 121 In

4 DATA 2 22 In

5DATA 323 In

6 DATA 4 24 In

7DATA 525 In

8 DATA 6 26 In

9DATA 727 In

10 PtrClk 28 Out Printer clock signal.

PtrBusy /

DataBit-3,7

29 Out

Printer busy signal and reverse channel transfer data bit 3 or 7.

AckDataReq / DataBit-2,6

28 Out

Acknowledge data request signal and reverse channel transfer data bit 2 or 6.

Xflag /

DataBit-1,5

28 Out

X-flag signal and reverse channel transfer data bit 1 or 5.

14 Host Busy 30 In Host busy signal.

31 -INIT 30 In Not used.

-DataAvail / DataBit-0,4

29 Out

Data available signal and reverse channel transfer data bit 0 or 4.

36 1284-Active 30 In 1284 active signal.

18 Logic-H - Out Pulled up to +5V via 3.9K ohm resistor.

35 +5V - Out Pulled up to +5V via 3.3K ohm resistor.

17 Chassis GND - - Chassis GND

16,33,

19-30

GND - - Signal GND

15,34 NC - - Not connected

Table 1-9. Connector Pin Assignment and Signals (continued)

Pin No. Signal Name

Return

GND Pin

In/Out Functional Description

Page 18

EPSON Stylus COLOR C70/C80 Revision A

PRODUCT DESCRIPTION INTERFACE 18

Extensibility Request:

The printer responds affirmatively when the extensibility request values are 00H or 04H, that mean,

00H: Request Nibble Mode Reverse Channel Transfer. 04H: Request Device ID;

Return Data Using Nibble Mode Rev Channel Transfer.

Device ID:

The printer sends the following device ID string when it is requested.

When IEEE1284.4 is enabled,

[00H] [4EH] MFG: EPSON; CMD: ESCPL2, BDC, D4; MDL: STYLUS[SP]COLOR[SP]C70/C80; CLS: PRINTER; DES: EPSON[SP]STYLUS[SP]COLOR[SP]C70/C80;

When IEEE1284.4 is disabled,

[00H] [4BH] MFG: EPSON; CMD: ESCPL2, BDC; MDL: STYLUS[SP]COLOR[SP]C70/C80; CLS: PRINTER; DES: EPSON[SP]STYLUS[SP]COLOR[SP]C70/C80;

1.3.3 USB Interface

Standard: Based on

“Universal Serial Bus Specifications Revision 1.0” “Universal Serial Bus Device Class Definition

for Printing Devices Version 1.0” Bit Rate: 12 M bps (Full Speed Device) Data Encoding: NRZI Adaptable Connector: USB Series B Recommended Cable Length: 2 meters

Figure 1-4. USB Pin Assignment

Table 1-10. Connector Pin Assignment and Signals

Pin No. Signal Name I/O Function Description

1 VCC - Cable power. Max. power consumption is 2mA

2 -Data Bi-Directional Data

3 +Data Bi-Directional Data, pull up to +3.3 V via 1.5K ohm resistor

4 Ground - Cable ground

Pin #1

Pin #3

Pin #2

Pin #4

Page 19

EPSON Stylus COLOR C70/C80 Revision A

PRODUCT DESCRIPTION INTERFACE 19

1.3.4 Prevention Hosts of Data Transfer Time-out

Generally, hosts abandon data transfer to peripherals when a peripheral is in the busy state for dozens of seconds continuously. To prevent hosts from this kind of time-out, the printer receives data very slowly, several bytes per minute, even if the printer is in busy state. The slowdown is started when the rest of the input buffer becomes several hundreds of bytes. Finally the printer is in the busy state continuously when the input buffer is full. USB and IEEE1284.4 on the parallel interface do not require this function.

1.3.5 Interface Selection

The printer has 2 built-in interfaces: the USB and parallel interface. These interfaces are selected automatically.

 Automatic Selection

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 the stand-by state for the seconds, the printer is returned to the idle state. As long as the host sends data or the printer interface is busy state, the selected interface is let as it is. The changes to other Interface are prohibited during Duplex printing.

 Interface State and Interface Selection

When the parallel interface is not selected, the interface got into the busy state. When the printer is initialized or returned to the idle state, the parallel interface got into the ready state. Caution that the interrupt signal such as the -INIT signal on the parallel interface is not effective while that interface is not selected.

1.3.6 IEEE1284.4 Protocol

The packet protocol described by IEEE1284.4 standard allows a device to carry on multiple exchanges or conversations which contain data and/or control information with another device at the same time across a single point-to-point link. The protocol is not, however, a device control language. It does provide basic transport-level flow control and multiplexing services. The multiplexed logical channels are independent of each other and blocking of one has no effect on the others. The protocol operate over IEEE1284.



Automatic Selection An initial state is compatible interface and starts IEEE1284.4 communication when magic strings (1284.4 synchronous commands) are received.



On An initial state is IEEE1284.4 communication and data that received it by the time it is able to take synchronization by magic string (1284.4 synchronous commands) is discarded.

 Off

An initial state is compatible interface and never starts IEEE1284.4 communication even if magic strings (1284.4 synchronous commands) are received.

Page 20

EPSON Stylus COLOR C70/C80 Revision A

PRODUCT DESCRIPTION INTERFACE 20

1.3.7 Printer Language and Emulation

Printer Language: (Stylus COLOR C70)

EPSON ESC/P2 expanded raster graphics EPSON Remote

(Stylus COLOR C80)

ESC/P2 and expanded raster graphics code EPSON Remote command

1.3.7.1 Control codes

 ESC/P2 control codes

Table 1-11. ESC/P2 control codes (Stylus COLOR C70)

General operation Initialize Printer ESC @

Paper feeding

Form Feed Line Feed Carriage Return

FF LF CR

Table 1-12. ESP/P2 control codes (Stylus COLOR C80)

General operation

Initialize Printer Unidirectional Printing CSF Mode Control

ESC @ ESC U ESC EM

Paper feeding

Form Feed Line Feed Line Spacing Carriage Return

FF LF ESC 0, ESC 2, ESC 3, ESC + CR

Page format

Page Length Left / Right Margin Top / Bottom Margin

ESC (C, ESC C, ESC C0, ESC (S ESC Q, ESC I ESC (c, ESC N, ESC O

Print position motion

Horizontal Print Position Vertical Print Position Tab Horizontally Tab Vertically Advance paper

ESC $, ESC ¥ ESC (V, ESC (v ESC D, HT ESC B, VT ESC J

Font selection

Typeface Pitch and Point Pitch Italic font Bold Font Master Select

ESC k, ESC x ESC X ESC P, ESC M, ESC g, ESC p ESC 4, ESC 5 ESC E, ESC F ESC !

Font enhancement

Double-Width Condensed Double-height Double-Strike Super / Subscript Underline Line / Score Character Style

ESC W, DC4, SO DC2, SI ESC w ESC G, ESC H ESC T, ESC S ESC ESC(ESC q

Spacing

Intercharacter Space HMI Define Unit

ESC Space ESC c ESC (U

Character handling

Character Table International Character User-Defined Characters Upper Control Codes Print Data as characters

ESC t, ESC (t ESC R ESC %, ESC &, ESC : ESC 6, ESC 7 ESC (^

Bit image Bit Image ESC

Color Printing Color ESC r (Black )

EEPROM control EEPROM control ESC |

Table 1-12. ESP/P2 control codes (Stylus COLOR C80) (continued)

Page 21

EPSON Stylus COLOR C70/C80 Revision A

PRODUCT DESCRIPTION INTERFACE 21



Control codes for graphics mode

1.3.7.2 EPSON D4 control channel commands

The details of each command refer to 1284.4 control command specifications (DS-716).

 Command List

Table 1-13. Control codes for graphics mode

General operation

Initialize Printer Unidirectional Printing CSF Mode Control

ESC @ ESC U ESC EM

Paper feeding

Form Feed Line Feed Line Spacing Carriage Return

FF LF ESC + CR

Page format

Page Length Top / Bottom Margin Paper size

ESC (C ESC (c ESC (S

Print position motion

Horizontal Print Position Vertical Print Position

ESC $, ESC ¥, ESC ($, ESC (/ ESC (V, ESC (v

Spacing Define Unit ESC (U

Graphics

Graphics Mode Raster Graphics Dot size control Print a Image Microweave control (Stylus COLOR C80 )

ESC (G ESC ., ESC (D, ESC i ESC (e ESC ACK

ESC (i

Printing mode Printing mode ESC (K

Color Printing Color ESC r, ESC (r

Table 1-14. Command List

Contents Command m1

Reply Device ID di -

Reply Status string st -

Reply Cartridge

Position

cx -

Reply Ink Cartridge

condition

cs 0x00, 0x01

Exchange Ink

Cartridge

xi 0x01, 0x80

Execute Cleaning ch 0x01

Print Nozzle check

pattern

nc -

Terminate Ink-

exchange Sequence

ei 0x00

Reply CSIC

Information

ii 0x01, 0x02, 0x03, 0x04

Set Printer timer

(Stylus COLOR C70 )

ti m1

(*1)

Clear Paper Out

Error

pe 0x01

Clear Paper Jam

Error

pj 0x01

Reply Ink-exchange

flag

ex Com Num = 0x19

Initialize Printer rs 0x01

Reply number of

printable sheet

ir 0x80

Page 22

EPSON Stylus COLOR C70/C80 Revision A

PRODUCT DESCRIPTION INTERFACE 22

NOTE: (*1) parameters indicate a time (Stylus COLOR C70 only)

 Reply Printer State

The printer sends one of six string shown below that indicates current printer state periodically (set by a BDC-PS command. by default, 2 seconds.).

Format of reply strings:

@BDC [SP] ST [CR] [LF] ST:<Status Code>; ER:<Error Code>; [WR:<Warning Code>[,<Warning Code>]...;] IQ:<nn1><nn2><nn3><nn4>; RV;<n>; AI;CW:02<KK><CC><MM><YY>,MI:<mm>; [TC:<TTTT>;] INK:1101,3202,4304,5408;IG:0108NA; [FF]



Status Codes The parameter <Status Code>is two bytes of ASCII codes that indicates printer status.

 Error Codes

Theparameter <Error Code> is two bytes of ASCII codes that indicates following errors of a printer.

Parameter Mean Note

m1, m2, year year = m2 x 256 +m1

m3 month 1<= m3 <= 12

m4 day 1 <= m4 <= 31

m5 hour 0 <= m5 <= 24

m6 minute 0 <= m6 <= 60

m7 second 0 <= m7 <= 60

Table 1-15. Status Codes

Status Status code Priority

Error “00“ 1

Self-test “01“ 1

Busy (buffer full) “02“ 4

Wait (printing) “03“ 5

Idle “04“ 6

Cleaning/fill up “07“ 2

Before Initialize fill up “08“ 1

Table 1-16. Error Codes

Error Code Printer State

“00“ Fatal Error

“01“ I/F not select Error

“04“ Paper jam Error

“05“ Ink Out Error

“06“ Paper Out Error

“10“ Maintenance request

“12“ Double Feed Error

Page 23

EPSON Stylus COLOR C70/C80 Revision A

PRODUCT DESCRIPTION INTERFACE 23



Quantity of ink The parameter <nn1>, <nn2>, <nn3>, <nn4> are two bytes ASCII codes that indicate quantity of black ink, cyan ink, magenta ink and yellow ink respectively. If the ink cartridge is not inserted, <nnx> indicates “NA”. The unit of these parameters is percentage in hex-decimal.

 Warning Codes

The parameter <Warning Code> is two bytes of ASCII codes that indicates printer status

 Firmware revision

The parameter <n> is one bytes ASCII codes that indicate printer firmware revision.

 Actuator information

The parameter <KK>, <CC>, <MM>, <YY> are two bytes ASCII codes that indicate ink weight rank ID of black ink, Cyan ink, magenta ink and yellow ink respectively. The parameter <mm> is two bytes ASCII codes that indicate SelectMicroweave ID to determine the feed length of Microweave printings.

 Cleaning time information

The parameter <TTTT> is four bytes ASCII codes that indicate total time of cleaning or charging sequences in second unit. This character strings is displayed only during cleaning or charging. (Status code of “07”)

 MIB information

INK parameter shows the ink cartridge information for MIB. IG parameter shows the auto sheet feeder information for MIB.

Table 1-17. Warning Codes

WR Ink state

“10“ Black ink low

“11“ Cyan ink low

“12“ Magenta ink low

“13“ Yellow ink low

Page 24

EPSON Stylus COLOR C70/C80 Revision A

PRODUCT DESCRIPTION OPERATOR CONTROLS 24

1.4 OPERATOR CONTROLS

1.4.1 Operate Switch

Operate switch is located on the control panel.

1.4.2 Control Panel

1.4.2.1 Switches

There are 2 non-lock type push switches, 1 lock type push switch and 3 LED.

Figure 1-5. Control Panel

1.4.2.2 Indicators

(1) Power

Lights when the operate switch is “ON” and AC power is supplied.

(2) Paper Out

Lights during the paper-out condition, and blinks during the paper-jam condition.

(3) Ink Out

Lights during no ink condition, and blinks during the ink low condition.

Ink Button Paper Button Power Button

123

Page 25

EPSON Stylus COLOR C70/C80 Revision A

PRODUCT DESCRIPTION OPERATOR CONTROLS 25

1.4.3 Panel Functions

NOTE: (*1) 3 seconds is required at the User’s manual.

NOTE: (*2) This function is not available in printing status.

NOTE: (*) Status printings prints firmware version, ink counter and nozzle

check patterns.

NOTE: (*1) According to the content of 1 BH of EEPROM, one of following

actions is carried out.

NOTE: (*1) Refer to 1.4.5.1 Default setting.

NOTE: (*2) Refer to 1.4.5.2 Print head alignment.

Table 1-18. Panel Functions(Stylus COLOR C70)

Switch Function

Load/Eject

• Loads or Ejects the Paper.

• When carriage is on the Ink check position, move carriage to

next ink check position or cartridge change position.

• When carriage is on the ink cartridge change position, return carriage from Ink Cartridge change position.

• In the condition of ‘Double Feed Error’, Returning from error condition printing is restarted.

Cleaning

• Starts the Ink Cartridge change sequence.

(*2)

Move the carriage to cartridge change position.

• When carriage is on the ink change position, move carriage to next ink check position or cartridge change position.

• When carriage is on the ink change position, return carriage from ink cartridge change position.

Cleaning (Pushing for 2 seconds

*1)

• Starts the cleaning of head.

• In the condition of ‘Ink Low’ or ‘Ink Out’ or ‘No Ink Cartridge’,

starts the ink cartridge change sequence.

(*2)

Table 1-19. Panel Functions with Power On(Stylus COLOR C70)

Switch Pressing with Power on Function

Load/Eject

• Start status printings.*

(*1)

Load/Eject

Cleaning

• Enters the particular settings mode. (Service use only.) To enter the particular settings mode, it is necessary to push following switch while Paper Out LED is blinking. (It blinks about 5 seconds.)

(*3)

Table 1-20. Panel Functions with Power On(Stylus COLOR C80)

Switch Pressing with Power on Function

Paper

• Start status printings. *

(*1)

Ink

• Enters the user setting mode.

Paper

Ink

• Enters the particular setting mode (Service use only). To enter the particular settings mode, it is necessary to push following switch while Paper Out LED is blinking. (It blinks about 5 seconds.)

(*3)

Table 1-21. The Content of 1 BH of EEPROM

Content of 1BH of EEPROM,

[bit 7][bit 6]

Action

• Print firmware version, ink counter, selected code page and nozzle check pattern

• Start hex-dump printing

• Start self test printing

Table 1-22. User settings mode (Stylus COLOR C80 only)

Switch Function

Paper

• Enters the default setting mode.

(*1)

Ink

• Enters the print head alignment mode.

(*2)

Page 26

EPSON Stylus COLOR C70/C80 Revision A

PRODUCT DESCRIPTION OPERATOR CONTROLS 26

NOTE: (*3) Refer to Chapter 7 EEPROM map.

1.4.4 Printer Condition and Panel Status

NOTE: (-) Don’t care.

The reason why possible causes of paper out and double feed errors are listed together is because double feeding during duplex printing can cause problems with page numbering and render the whole printing job useless, so that if it is judged that the paper is longer than the normal length, the current page is fully ejected, and then a paper out error is indicated straight away to prompt the customer to reset the paper. Furthermore, it is also assumed that such double-feed errors will result in the paper running out before the last page or the last few pages are printed, and so double feed and paper out errors are handled in the same way. This is considered to be a refinement of conventional paper jam detection.

Table 1-23. Particular settings mode (Stylus COLOR C70)

Switch Function

Load/Eject

• Initialize EEPROM.

(*3)

Cleaning

(Pushing for 10

seconds )

• Reset the ink overflow counter in EEPROM.

(*3)

Table 1-24. Particular settings mode (Stylus COLOR C80)

Switch Function

Paper

• Initialize EEPROM

(*3)

and rest timer IC.

Ink

(Pushing for 10

seconds )

• Reset the ink overflow counter in EEPROM.

(*3)

Table 1-25. Printer Condition and LED Status

Printer Status

Indicators

Priority

Power Ink Out Paper Out

Power ON condition On - - 10

Ink sequence Blink - - 6

Ink Cartridge change mode Blink - - 5

Data processing Blink - - 8

Paper Out - - On 4

Double feed - - On 4

Paper jam condition - Off Blink 3

No ink cartridge or ink end - On - 7

Ink level low - Blink - 9

Enter EEPROM and Timer IC reset

- On On -

Maintenance request Blink Blink Blink 2

Fatal error Blink On Blink 1

Page 27

EPSON Stylus COLOR C70/C80 Revision A

PRODUCT DESCRIPTION OPERATOR CONTROLS 27

1.4.5 Printer setting mode (Stylus COLOR C80 only)

When turning the printer on with pushing the Cleaning switch, the Paper Out LED starts blinking. Then, to pushing the Load /Eject switch again while the Paper Out LED is blinking, or no switch pushing while the Paper Out LED is blinking, the printer enters the Default setting mode. To pushing the Cleaning switch while the Paper Out LED is blinking, the printer enters the Print head alignment mode.

1.4.5.1 Default setting mode

There are some parameters that can be changed by users and will be referred at the time of initialization of the printer.

 Setting method

(a)Press Load/Eject button.

The method of selecting language for ‘Usage of this mode’ is printed.

(b)Select language for ‘Usage of this mode’ by Cleaning button.

Paper Out LED, Ink Out LED and Power LED show the language for ‘Usage of this mode’ that is currently selected. The selection will be advanced one by one as the button is pressed and the On/Off/Blink of those three LEDs will also be changed according to the selection.

(c)Press Load/Eject button.

The current setting and the ‘Usage of this mode’ by selected language will be printed on the paper set in the paper path at that time.

(d)Select menu by Cleaning button.

Paper Out LED, Ink Out LED and Power LED show the menu which is selected at that time. The selection will be advanced one by one as the button is pressed and the combination of those three LEDs status of On/Off/Blink/2-Blinks will be changed according to the selection.

(e)When Load/Eject button is pressed, Printer changes the indication to the setting value

of the selected menu. Paper Out LED , Ink Out LED and Power LED show the current setting value.

(f)Select setting value by Load/Eject button.

Paper Out LED, Ink Out LED and Power LED show that menu’s value by status of On/Off/Blink/2-Blinks. That value can be changed by pressing Load/Eject button and the LEDs status of On/ Off/Blink/2-Blinks will be changed as the button is pressed.

(g)When Cleaning button is pressed, Printer memorize the setting value, and changes

the indication to the main menu. Paper Out LED, Ink Out LED and Power LED show the current menu setting.

(h)Repeat (d) to (g)

The menu selection will return to the first menu after the last menu selection is over.

(i)Turn the printer off

The setting is stored into non-volatile memory.

Table 1-26. Setting Menu

Menu Setting

Font Roman / Courier / Draft

Print direction Auto / Bi-D / Uni-D

Loading Position 3 mm / 8.5 mm / Others

Parallel I/F transfer rate Fast / Normal

Auto line feed Off / On

0 slash

0 / ø

Pitch 10 cpi, 12 cpi, 15 cpi, 17 cpi, 20 cpi, Proportional

Character tables

Italic USA, Italic France, PC 858. Italic Germany, Italic U.K, ISO 8859-15, Italic Denmark, Italic Sweden, PC 863, Italic Italy, Italic Spain, PC 861, PC 437, PC 437 Greek, PC 771, PC 850, PC 853, PC 855, PC 852, PC 857, PC 866, PC 869, MAZOWIA, Code MJK. ISO 8859-7, ISO Latin 1T, Bulgaria, PC 774, Estonia, ISO 8859-2, PC 866 LAT, PC 860, PC 861, PC 865, PC 866 UKR, PC AR864, PC APTEC, PC 708, PC 720, BRASCII, Abicomp, Roman 8 ISO Latin1

Page 28

EPSON Stylus COLOR C70/C80 Revision A

PRODUCT DESCRIPTION OPERATOR CONTROLS 28

1.4.5.2 Print head alignment mode

Some alignment can be adjusted by users.



Alignment method

(a) Press Cleaning button.

The method of selecting language for ‘Usage of this mode’ is printed.

(b) Select language for ‘Usage of this mode’ by Cleaning button.

Printer prints the instruction sheets on how to adjust the printer.

(d) Look at the tests printed along with the instruction and press the Cleaning button

until the panel lights indicate the appropriate test number.

(e) Press Load/Eject button. Then, printer prints the test pattern.

(f) Look at the test patterns on the new printout and press the Load/Eject button until

the panel lights indicate the test pattern that is most closely aligned.

(g) Press the Cleaning button.

(h) Follow step (d) to step (g) as many times as needed to properly align all the test

patterns on the printouts.

(i) Turn the printer off.

1.4.6 Printer Initialization

There are three kinds of initialization method.

1. Power-on Initialization This printer is initialized when turning the printer power on, or printer recognized the cold-reset command (remote RS command).

When printer is initialized, following action is performed: (a) Initializes printer mechanism. (b) Clears input data buffer. (c) Clears print buffer. (d) Sets default values.

2. Operator Initialization This printer is initialized when turning the printer power on again within 10 seconds from last power off, or printer recognized the -INIT signal (negative pulse) of parallel interface.

When printer is initialized, following action is performed: (a) Cap the printer head. (b) Eject a paper. (c) Clears input data buffer. (d) Clears print buffer. (e) Sets default values.

3. Software Initialization The ESC@ command also initialize the printer.

When printer is initialized, following action is performed: (a) Clears print buffer. (b) Sets default values.

4. Power-on initialization except I/F The printer recognized the IEEE 1284.4 “rs” command.

When printer is initialized, following action is performed. (a) Initializes printer mechanism. (b) Clears input data buffer. (c) Clears print buffer. (d) Sets default values except I/F.

Page 29

EPSON Stylus COLOR C70/C80 Revision A

PRODUCT DESCRIPTION OPERATOR CONTROLS 29

1.4.7 Errors



Ink Out

When the printer runs out the most part of the ink of any color, it warns ink-low and keeps printing. When the printer runs out the whole ink of any one color, it stops printing and indicates ink-out error. User is requested to install a new inkcartridge in this state. An ink-cartridge once taken out should never be used again. Re-installation of the cartridge not filled fully upsets the ink level detection and may cause a serious problem in the print head as a result.



Paper Out

When printer fails to load a sheet, it goes paper out error.



Paper Jam

When printer fails to eject a sheet, it goes a paper jam error.



No Ink-Cartridge

When printer detects that ink-cartridge comes off, it goes this error mode.



Maintenance Request

When the total quantity of ink wasted through the cleanings and flushing is reaches to the limit, printer indicates this error and stops. The absorber in the printer enclosure is needed to be replaced with new one by service person.



Fatal Errors

Carriage control error or CG access error.



Double Feed

When printer fails to load a sheet, it goes Double feed error.

Page 30

EPSON Stylus COLOR C70/C80 Revision A

PRODUCT DESCRIPTION PAPER 30

1.5 PAPER

1.5.1 Paper Handling

Do not perform reverse feed more than 9.5 mm (0.38”).

1.5.2 Paper Specification

1.5.2.1 Cut Sheet

1.5.2.2 Envelope

NOTE: Envelope printing is only available at normal temperature.

NOTE: Keep the longer side of the envelope horizontally at setting.

1.5.2.3 Index Card

Table 1-27. Paper Specification (Cut Sheet)

Size

A4: Width 210 mm x Length 297 mm) Letter: Width 216 mm x Length 279 mm B5: Width 182 mm x Length 257 mm Legal: Width 216 mm x Length 356 mm Statement: Width 139.7 mm x Length 215.9 mm Executive: Width 184.2 mm x Length 266.7 mm Photo Paper: Width 101.6 mm x Length 152.4 mm

Thickness 0.08mm - 0.11mm

Weight 64g/m2 (17 lb.) - 90g/m2 (24 lb.)

Quality Exclusive paper, Bond paper, PPC

Table 1-28. Paper Specification (Envelope)

Size

No.10: Width 241 mm x Length 104.8 mm DL: Width 220 mm x Length 110 mm C6: Width 162 mm x Length 114 mm

Thickness 0.16mm - 0.52mm

Weight 45g/m2 (12 lb.) - 75g/m2 (20 lb.)

Quality Bond paper, Plain paper, Air mail

Table 1-29. Paper Specification (Envelope)

Size

A6 Index Card: Width 105 mm x Length 148 mm A5 Index Card: Width 148 mm x Length 210 mm 5 x 8” Index Card: Width 127 mm x Length 203 mm 10 x 8” Index Card: Width 254 mm x Length 203 mm

Thickness Less than 0.23 mm

Page 31

EPSON Stylus COLOR C70/C80 Revision A

PRODUCT DESCRIPTION PAPER 31

1.5.2.4 EPSON special media



EPSON specifically designed media for ink jet printers

(1) Bright White ink Jet Paper

(2) 360 dpi Ink Jet Paper

(3) Matte Paper-Heavyweight

(4) Archival Matte Paper

(5) Premium Glossy Photo Paper

(6) Premium Semigloss Photo Paper

(7) Ink Jet Transparencies

(8) Photo Stickers 4/16

(9) Iron-On Cool Peel Transfer Paper

Table 1-30. Bright White ink Jet Paper

Size A4: Width 210 mm x Length 297 mm

Thickness 0.13 mm

Weight 92.5 g/m2(25 lb)

Table 1-31. 360 dpi Ink Jet Paper

Size

A4: Width 210 mm x Length 297 mm Letter: Width 215.9 mm x Length 279.4 mm

Thickness 0.11 mm

Weight 89 g/m2 (24 lb)

Table 1-32. Matte Paper-Heavyweight

Size

A4: Width 210 mm x Length 297 mm Letter: Width 215.9 mm x Length 279.4 mm

Thickness 0.23 mm

Weight 167 g/m2 (44 lb)

Table 1-33. Archival Matte Paper

Size

A4: Width 210 mm x Length 297 mm Letter: Width 215.9 mm x Length 279.4 mm

Thickness 0.25 mm

Weight 189 g/m2 (50 lb)

Table 1-34. Premium Glossy Photo Paper

Size

A4: Width 210 mm x Length 297 mm Letter: Width 215.9 mm x Length 279.4 mm

Thickness

0.27 mm

Weight

255 g/m2 (68 lb)

Table 1-35. Premium Semigloss Photo Paper

Size

A4: Width 210 mm x Length 297 mm Letter: Width 215.9 mm x Length 279.4 mm

Thickness

0.27 mm

Weight

250 g/m2 (66 lb)

Table 1-36. Bright White ink Jet Paper

Size

A4: Width 210 mm x Length 297 mm Letter: Width 215.9 mm x Length 279.4 mm

Thickness 0.13 mm

Table 1-37. Photo Stickers 4/16

Size

A6: Width 105 mm x Length 148 mm

Thickness

0.19 mm

Table 1-38. Iron-On Cool Peel Transfer Paper

Size

A4: Width 210 mm x Length 297 mm Letter: Width 215.9 mm x Length 279.4 mm

Thickness

0.18 mm

Page 32

EPSON Stylus COLOR C70/C80 Revision A

PRODUCT DESCRIPTION PAPER 32

1.5.3 Printing Area

1.5.3.1 Cut Sheet

Figure 1-6. Printable Area for Cut Sheet

NOTE: Refer to 1.5.2 PW (paper width) and PL (paper length)

NOTE: (*)Bottom margin is expanded to 3mm when paper dimension is

defined by using command, otherwise it is not expanded (14mm).

NOTE: From a form lower end 3 mm as for 14 mm area a printing may scramble.

Printable Area

Table 1-39. Character mode

Paper Size

Left margin

(min.)

Right Margin

(min.)

Top Margin

(min.)

Bottom Margin

(min.)

A4 3 mm (0.12”) 3 mm (0.12”) 3 mm (0.12”)

14 mm (0.54”)

Letter 3 mm (0.12”) 9 mm (0.35”) 3 mm (0.12”)

14 mm (0.54”)

B5 3 mm (0.12”) 3 mm (0.12”) 3 mm (0.12”)

14 mm (0.54”)

Legal 3 mm (0.12”) 9 mm (0.35”) 3 mm (0.12”)

14 mm (0.54”)

Statement 3 mm (0.12”) 3 mm (0.12”) 3 mm (0.12”)

14 mm (0.54”)

Exclusive 3 mm (0.12”) 3 mm (0.12”) 3 mm (0.12”)

14 mm (0.54”)

Table 1-40. Raster Graphics mode

Paper Size

Left margin

(min.)

Right Margin

(min.)

Top Margin

(min.)

Bottom Margin

(min.)

A4 3 mm (0.12”) 3 mm (0.12”) 3 mm (0.12”)

14 mm (0.54”) / 3mm (0.12”) *

Letter 3 mm (0.12”) 3 mm (0.12”) 3 mm (0.12”)

14 mm (0.54”) / 3mm (0.12”) *

B5 3 mm (0.12”) 3 mm (0.12”) 3 mm (0.12”)

14 mm (0.54”) / 3mm (0.12”) *

Legal 3 mm (0.12”) 3 mm (0.12”) 3 mm (0.12”)

14 mm (0.54”) / 3mm (0.12”) *

Statement 3 mm (0.12”) 3 mm (0.12”) 3 mm (0.12”)

14 mm (0.54”) / 3mm (0.12”) *

Executive 3 mm (0.12”) 3 mm (0.12”) 3 mm (0.12”)

14 mm (0.54”) / 3mm (0.12”) *

Page 33

EPSON Stylus COLOR C70/C80 Revision A

PRODUCT DESCRIPTION PAPER 33

1.5.3.2 Envelopes

Figure 1-7. Printable Area for Envelopes

Table 1-41. Envelope Margin

Paper Size

Left Margin

(min.)

Right Margin

(min.)

Top Margin

(min.)

Bottom Margin

(min.)

#10 3 mm (0.12”) 28 mm (1.10”) 3 mm (0.12”) 14 mm (0.55”)

DL 3 mm (0.12”) 7 mm (0.28”) 3 mm (0.12”) 14 mm (0.55”)

C6 3 mm (0.12”) 3 mm (0.12”) 3 mm (0.12”) 14 mm (0.55”)

Printable Area

Page 34

EPSON Stylus COLOR C70/C80 Revision A

PRODUCT DESCRIPTION INK CARTRIDGE 34

1.6 INK CARTRIDGE

1.6.1 Black Ink Cartridge

Type: Exclusive Cartridge Color: Black Print Capacity: 1240 pages/A4

(ISO/IEC 10561 Letter Pattern at 360 dpi) Ink Life: 2 years from production data. Storage Temperature: -20

C to 40 oC (Storage, within a month at 40 oC)

-30

C to 40 oC (Packing storage, within a month at 40 oC)

-30

C to 60 oC (Transit, within 120 hours at 60 oC

and within a month at 40

Dimension: 22.0 mm (W) x 71.2 mm (D) x 66.5 mm (H)

Figure 1-8. Black Ink Cartridge

1.6.2 Color Ink Cartridge

Type: Exclusive Cartridge Color: Magenta, Cyan, Yellow Print Capacity: 420 pages / A4 (360 dpi, 5% duty each color) Ink Life: 2 years from production date Storage Temperature: -20

C to 40 oC (Storage, within a month at 40 oC)

-30

C to 40 oC (Packing storage, within a month at 40 oC)

-30

C to 60 oC (Transit, within 120 hours at 60 oC

and within a month at 40

Dimension: 12.7 mm (W) x 71.2 mm (D) x 66.5 mm (H)

Figure 1-9. Color Ink Cartridge

NOTE: Ink cartridge can not re-fill, only ink cartridge is prepared for article of

consumption.

NOTE: Do not use the ink cartridge which was passed away the ink life.

NOTE: Ink will be frozen under -4

C environment however, it will be usable

after placing it more than 3 hours at room temperature.

Page 35

CHAPTER

OPERATING PRINCIPLES

Page 36

EPSON Stylus COLOR C70/C80 Revision A

Operating Principles Overview 36

2.1 Overview

This section describes the operating principles of the printer mechanism and electrical circuit boards. The Stylus COLOR C70/C80 has the following boards:

 Main board: C424 MAIN-B

NOTE: There is no part with the name C424 Main in current products. The C424

Main-B board in the Stylus C70 and C80 has a different name, and so is not exactly the same part. The parts code for ordering is also different.

 Power supply board: C424 PSB/PSE

2.1.1 Printer Mechanism

The printer mechanism for Stylus COLOR C70/C80 is designed newly. But, the basic component of the printer mechanism is same as previous product. This printer consists of Print Head, Carriage Mechanism, Paper Feeding Mechanism, Paper Loading Mechanism, Ink System (Pump Mechanism, Cap Mechanism, and Carriage Lock Mechanism).

Like other EPSON ink jet printers, the Stylus COLOR C70/C80 is equipped with two DC motors; one for ASF, Paper feeding/ Pump mechanism, and one for CR mechanism. ASF unit uses rear entry front eject system. This ASF unit is also designed newly and LD roller loads the paper to the printer mechanism.

For cap assembly, Stylus COLOR C70/C80 uses valveless mechanism; new design for this model.

Figure 2-1. Printer Mechanism block diagram

ASF Hopper Spring

CR Motor

P a p e r B a c k L e v e r

Paper separation pad

Clutch mechanism

CR unit

PF Roller

PE Actuator

LD Roller

Pump Assembly

Paper Eject Roller

PF Timing Belt

CR Timing belt

CR lock Lever

PF Motor

Cap Assembly

PF Encoder

Rotary Scale

Linear Scale

CR Encoder

Silence Cam

Page 37

EPSON Stylus COLOR C70/C80 Revision A

Operating Principles Overview 37

2.1.2 Printhead

The printhead uses a new developed P-MACH head and Stylus COLOR C70/C80 can perform variable dot printing.

The CSIC-chip is mounted on the ink cartridge. By storing ink life data, this IC makes it possible to control the ink in ink cartridge unit.

The basic operating principles of the printhead, which plays a major role in printing, are the same as previous models; on-demand method which uses PZT (Piezo Electric Element). In order to uniform the amount of ejecting ink, the printhead has its own head ID (13 digits for this printhead) which adjust PZT voltage drive features. The printhead stores the head ID to EEPROM and generates appropriate PZT drive voltage to prevent amount of ink from varying by printheads.

Following explains printhead basic components.

 PZT

PZT is an abbreviation of Piezo Electric Element. Certain amount of voltage expands and contracts PTZ. The drive wave generated on MAIN board drives PZT and PZT pushes the top cavity which has ink stored to discharge the ink from each nozzle on the nozzle plate.

 Ink Cavity

The ink absorbed from the ink cartridge goes through the filter and then is stored temporarily in this tank called “cavity” until PZT is driven.

 Nozzle Plate

The board with nozzle holes on the printhead surface is called Nozzle Plate.

 Electrodes for CSIC-chip

The communication between CSIC-chip and main unit is performing via the electrodes on the carriage.

 Filter

When the ink cartridge is installed, if any dirt or dust around the cartridge needle is absorbed into the head, there is a great possibility of causing nozzle clog and disturbance of ink flow, and finally causing alignment failure and dot missing. To prevent this problem, a filter is set below the cartridge needle, where ink is filtered.

Figure 2-2. Printhead Sectional Drawing (Image)

2.1.2.1 Printing Process

This section explains the process in which the printheads of On-Demand inkjet printers eject ink from each nozzle.

Normal State:

When no printing signal is sent from PC, or no PZT drive voltage is applied, PZT does not change shape, therefore PZT does not squeeze the cavity. Ink pressure inside the cavity is kept normal. (Refer to Figure 2-3.)

Ejecting State:

When the print signal is output from the C424 MAIN-B board, IC (Nozzle Selector) located on the printhead unit latches data once by 1-byte unit.

Nozzle Selector Board

Needle

Ink Cartridge

Filter

Cavity

PZT

Nozzle Plate

CSIC-chip

Electrodes for CSIC-chip

Page 38

EPSON Stylus COLOR C70/C80 Revision A

Operating Principles Overview 38

An appropriate PZT latched by the nozzle selector is pushed into the cavity by the common voltage applied from the main board. By this operation, ink stored in the cavity spurts out from nozzles.(Refer to Figure 2.1.2.2.)

Figure 2-3. Printhead printing process

2.1.2.2 Printing Method

For print dot system, Stylus COLOR C70/C80 has the following two kinds of printing modes.

 Economy dot printing

 Variable dot printing (VSD1, VSD2, VSD3. 3types is all.)

The above two dot types are automatically selected depending on the media and the resolution setting of the printer driver. The following explains each printing mode.



Normal dot printing With this printer, Economy dot printing is basically used only during Economy mode printing. The reason is that the resolution is low during Economy mode printing, so that the dot size needs to be bigger. Economy printing consists of 2 shots.

 Variable dot printing

This printing mode is developed to improve the power of graduation-expression. This mode is basically the same as variable dot printing mode used on other products /; small dot, middle dot, and large dot compose this mode. Print dot size varies according to print data and this mode enables even sharper image output on almost all the papers.

Ink Path

PZT

Ink Cavity

Nozzle

Nozzle plate

PZT drive voltage

Page 39

EPSON Stylus COLOR C70/C80 Revision A

Operating Principles Overview 39

2.1.3 Carriage Mechanism

The carriage mechanism consists of Carriage motor (CR motor), Carriage unit (including printhead), CR timing belt, CR guide shaft, CR guide frame etc. In contrast to previous models, this model has no HP sensor, so that when the carriage unit goes out of step at right side, it is judged to be at the home position. The carriage mechanism moves the carriage back and forth according to the drive from the carriage motor. The following stepping motor is mounted to drive CR mechanism. (See the table below.)

Table 2-1. Carriage Motor Specification

The drive from CR motor is transferred to the CR unit via CR timing belt. And the CR home position is detected when firmware judges the carriage is going out of step at right side. Previous products, this printer have the PG adjustment value (1.35mm).

The PG lever selections that can be carried out by the customer are shown in the following table.

Figure 2-4. Carriage Mechanism (Top view)

CR home position is detected by the feed back signal from the Linear Scale. This is normally signal (1), but when the HP is out of step, it becomes (2).

Figure 2-5. CR home position

Items Specifications

Type DC motor

Drive Voltage +42 V +/ - 5% (DRV IC voltage)

Coil Resistance 22.3 Ω +/ - 15% (per phase at 25 degree)

Inductance 17.3mH +/ - 25%(1KH 1VmA)

Drive Method PWM drive (PWM means Pulse Width Moduration.)

Driver IC A3974 (Same to PF motor)

CR Guide shaft

CR Timing belt

PE Actuator

CR Motor

CR unit

CR Encoder

Linear Scale

Page 40

EPSON Stylus COLOR C70/C80 Revision A

Operating Principles Overview 40

2.1.4 Paper Feeding Mechanism

The paper feeding mechanism consists of Paper feed motor (PF motor), PF roller, Paper eject roller, Star wheel roller, and so on. The paper feeding mechanism feeds paper loaded from ASF using the PF roller and Paper Eject Roller & Star wheel roller. For this mechanism, the PF motor mentioned in the right Table 2-2 is used on this product.

The drive of the PF motor is transfer to the PF roller and the Paper Eject Roller as following Figure 2-6. Following shows you how to transfer the PF motor drive to the PF roller and the Paper Eject Roller.

The PF motor has the following three functions: PF/ASF/Pump. Thus cleaning is not possible during printing. If you try to do cleaning while printing is in progress, the current page will first be ejected and then cleaning will start.

Table 2-2.

PF Motor Specifications

Figure 2-6. Paper Feeding Mechanism

Paper loaded from ASF is advanced by the following roller.

 Paper feed roller & Paper guide roller (assembled on the Top Frame)

→ Paper

eject roller & Star wheel roller (assembled on the Paper eject frame).

Additionally, the top & end of the paper is detected with the PE sensor. In case the PE sensor dose not detect the paper in the paper loading sequence, the printer detects the “Paper out error”. If the paper is detected after complete the paper eject sequence, the printer detects the “Paper jam error”. Also, if the longer paper is detected after complete the paper eject sequence, the printer detects the "Double feed error".

Item Description

Motor type DC motor

Drive voltage +42 V +/ - 5% (DRV IC voltage)

Coil Resistance 22.3 Ω +/ - 25% (per phase)

Inductance 17.3 mH +/ - 25%(1kH 1Vrms)

Driving method PWM drive (PWM means Pulse Width Modulation.)

Driver IC A3974 (Same to CR motor)

Combination Gear

12 x 16

Spur Gear 21.5

PF Motor

Pinion Gear

Rotary Encoder

Combination Gear

9.5 x 14.7

Spur Gear 21

Page 41

EPSON Stylus COLOR C70/C80 Revision A

Operating Principles Overview 41

2.1.5 Paper Loading Mechanism (ASF Unit)

The Paper loading mechanism is positioned at the printer rear. The Paper loading mechanism loads paper at the ASF unit and feeds paper to the PF roller.

 ASF Support Guide

Figure 2-7. ASF Support Guide

Purpose

1. When the specification 150 sheets of plain paper have been set, the customer can generally check whether 150 pages are loaded from the thickness of the ASF marking. However, it can be assumed that some customers might try to force more than 150 sheets in. The ASF guide is shaped like a key so that no more than 150 sheets can be placed into it so as to prevent paper feeding problems. The result is that this key shape encourages the customer to remove the excess number of sheets and to place them back into the hopper.

2. Another purpose of the ASF support guide is that when the paper back lever snaps back into place during paper feeding, the paper back lever also brings the key-shaped ASF support guide back to prevent multiple sheets of paper from being fed at once, thus improving the reliability of paper feeding.

This ASF unit was designed newly for this product and consists of LD roller, Pad holder (Paper return plate), ASF Frame, Hopper, and so on. For the major feature of this ASF unit, ASF HP sensor is not used and the single LD roller is built in the ASF unit. Drive sent from the PF motor is always transmitted to the ASF unit side. But, the Change lever and the Clutch mechanism switch ON/OFF the PF motor drive to the LD roller with the motor rotational direction.

Paper Back

Transmission Lever

Page 42

EPSON Stylus COLOR C70/C80 Revision A

Operating Principles Overview 42

CLUTCH MECHANISM

The Clutch mechanism is located at the rear of the printer inside the left part of the ASF unit.

Unlike the previous products, this product dose not have a ASF HP sensor. Instead of the ASF HP sensor, Change lever and the Clutch mechanism are used to detect the ASF home position. Following figures describe the mechanism.

 Paper feeding

1. When the print data is sent to the printer, paper feeding starts.

2. The Carriage unit moves to the left side of the printer and contacts the Change lever, causing the hook of the Change lever to disengage from the projection on the Clutch.

Figure 2-8. Paper feeding (1)

3. The driving force from the PF motor is transmitted via Combination gears 18.4 and 32.8, Spur gear 22.4, Spur gear 12 and Combination gear ratchet 33.4 in that order, causing the clutch and the LD roller to rotate clockwise so that paper is fed.

Figure 2-9. Paper feeding (2)

4. When the first sheet of paper has been fed, the second sheet is returned by the paper back lever.

Cange lever

the hook of

the change lever

the projection

on the clutch

Combination gears

18.4 and 32.8

Spur gear 22.4

Spur gear 12

Combination gear

ratchet 33.4

LD roller

Page 43

EPSON Stylus COLOR C70/C80 Revision A

Operating Principles Overview 43



Standby condition

1. Print data is not sent to the printer for 3 seconds.

2. The carriage unit moves to the left side of the printer and contacts the change lever, and the driving force from the PF motor causes the planetary unit to rotate counterclockwise so that it contacts the projection on the change lever, and prevents the change lever from returning.

Figure 2-10. Standby condition (1)

3. The driving force from the PF motor is transmitted via combination gears 18.4 and

32.8, spur gear 22.4, the planetary gear set, spur gear 12 and the clutch body in that order, causing the clutch and the LD roller to rotate counterclockwise.

Figure 2-11. Standby condition (2)

4. The hopper is moved back so that 150 sheets of paper can be loaded.

NOTE: Normally 20 to 30 sheets of paper should be loaded.

Planetary unit

the projection

on the change lever

Spur gear 22.4

LD roller

Combination gears

18.4 and 32.8

Spur gear 12

clutch body

Page 44

EPSON Stylus COLOR C70/C80 Revision A

Operating Principles Overview 44

SILENCE CAM MECHANISM

Following is the operation principles mentioned how to operate the silence CAM to drive ASF hopper quietly.

 Step 1 : Initial Status for both Silence CAM and LD Roller

1. Usually, silence cam is in the following initial condition. And hopper is in standby condition to allow user to set the paper. (plain paper 150 max.)

2. Figure 2-14 shows initial condition for silence cam, and Figure 2-15 shows initial condition for the hopper, LD roller, and paper return lever.

Figure 2-14. Silence Cam mechanism (1)

Figure 2-15. Silence Cam mechanism (2)

C H E C K

P O I N T

The silence cam and the silence lever on the ASF right frame apply a large amount of torque from A to B in order to move the hopper back to the standby mode position.

Figure 2-12. Standby condition (3)

During paper feeding, the LD roller is only rotated by combination gear ratchet 34.4, but in standby mode, the planetary gear set drives the drive LD and spur gear 12 drives combination gear ratchet 34.4, and both cause the LD roller to rotate.

Figure 2-13. Standby condition (4)

Silence cam

Silence lever

Planetary gear set

Drive LD

combination gear

ratchet 34.4

spur gear 12

Silence cam

Coupling shaft

Slowdown nail

Coupling shaft

limitation lever

LD roller

Paper return

lever

Page 45

EPSON Stylus COLOR C70/C80 Revision A

Operating Principles Overview 45

3. As you can see pictures, hopper is in the stand-by condition depending on "coupling shaft limitation lever" position, and this continues keeping by the "slowdown nail".

4. On the other hands, user can install paper(s) onto the hopper under the initial hopper status, and the "paper return lever" prevents unexpected paper loading into the printer internal.

NOTE: To make ASF activate, CR unit moves to left end of the CR shaft to push

the ASF trigger lever(ASF change lever), which is coupling in the clutch gear system.

 Step 2 : Loading Sequence

5. Once the printing data is input or load/eject switch is pressed down, the silence cam will rotate to counterclockwise direction in Figure 2-16 to bring the hopper to the hopper-state. In this sequence, when the top of the "slow down nail" reaches at top of the red row in Figure 2-16, hopper has already been located in hopping state, and a first paper has already been loaded to the printer internal.

6. Figure 2-17 shows the hopper condition when the top of "slow dawn nail" locates at top of red row in Figure 2-16. At this time, any clatter noise will not be occurred caused by the shape of silence cam.

6-1. Hopper condition:

Hopper has already been in hopper-state.

6-2. Paper return lever condition:

Paper return lever is in laid to insert a first paper to the printer internal.

6-3. LD roller has already been on the way of rotating to the forward direction:

Therefore, some degrees area of a top paper has been loaded to the printer internal.

Figure 2-16. Silence Cam mechanism (3)

Figure 2-17. Silence Cam mechanism (4)

C H E C K

P O I N T

Please note that paper return lever is operated by the cam gear located at backside of the silence cam. Refer to Step 5 for details.

Hopper Up

CAM gear

Hopper Up

Laid Paper Return Lever

Page 46

EPSON Stylus COLOR C70/C80 Revision A

Operating Principles Overview 46



Step 3 : Paper Return Sequence

7. Once a top paper is loaded to the printer internal, then the paper return sequence will be performed to prevent double feeding after the 2

papers.

8. At point A, when the "slow down nail" passes over a step, the hopper will be returned to the stand-by position from the hopper-state. That because the "upling shaft limitation lever" pulls down the "coupling shaft".

Figure 2-18. Silence Cam mechanism (5)

9. Also, "paper return lever" will suddenly be jumped out as well as the "slow down nail" passes over a step (Point A or Point B). This timing is managed and controlled by the "CAM gear" located on backside of the "Silence CAM". The jumped out "paper return lever" is the same condition to Step 4.

10. After the Step 9 operation completes, once loaded paper will more be loaded and ejected by the friction between PF roller and PF support rollers without ASF operation.

Figure 2-19. Silence Cam mechanism (6)

C H E C K

P O I N T



But the stand-by position Step 8 says does not mean the initial hopper-status which Step 1 shows. And this stand-by position will be decided depending on the total thickness of the current installed papers. (Figure 2-18 case, no paper or small quantity of papers is (are) installed to the hopper.)



This means, if the total thickness of current installed papers is very thick, slow-down nail will pass over the another step different from "Point A" as shown in Figure 2-18. The Figure 2-19 shows the case when user installs 150 sheets of plain papers on the hopper.

Hopper down

Point A

CCW

Hopper down

Point B

CCW

Page 47

EPSON Stylus COLOR C70/C80 Revision A

Operating Principles Overview 47



Step 4 : ASF Reset Operation

11. Once a loaded paper is completely printed and ejected, printer will perform the ASF reset operation if the next printing data does not input for a few seconds. Note that the printer will not perform the ASF reset operation if the printing data continues transferring after a 1

paper is printed and ejected. Following is its

details.

11-1.Stopping the Print Data for a few seconds

If the printer does not receive print data for a few seconds after ejecting a 1st paper, "silence cam" will rotate to counter clockwise direction, and will soon change its direction to clockwise direction to make the ASF return to its stand-by condition shown No.1.

After completing this reset operation, user can install more enough papers from the front side of the current installed papers. (maximum 150 sheets of normal plain papers) Because the hopper status is in the same condition to Step 1.

11-2.For the Continue Printing

In case the print data continues transferring from PC as soon as 1

paper is ejected, LD roller will rotate to counter clockwise direction again and same operation from Step 5 to Step 10 are performed until the print data is completely printed.

Figure 2-20. Silence Cam mechanism (7)

Case of 11 - 1

Case of 11 - 2

Page 48

EPSON Stylus COLOR C70/C80 Revision A

Operating Principles Overview 48



Step 5 : How to Operate Paper Return Lever

Following is the operation principles mentioned how to operate paper return lever.

12. Once you remove the "silence gear", you can see the "cam gear" which has a role for pushing down the "paper return transmission lever.

13. This "cam lever" is always jointed with both the "silence gear" and "super gear

28.8" (for driving LD roller on ASF).

14. When the "silence cam" rotates to counter clockwise, the "cam gear" will rotate to clockwise. And a part of circle arc (cam) on the "cam gear" pushes down the "paper return transmission lever". And paper return lever will be laid to guide a top paper to the printer internal.

Figure 2-21. Silence Cam mechanism (9)

C H E C K

P O I N T

There are two alignments on the right side of the ASF to get a correct timing for driving paper load operation and ASF reset operation.

Paper return transmission lever

A part of circle arc of the "Silence cam"

CAM gear

Paper return lever shaft

Page 49

EPSON Stylus COLOR C70/C80 Revision A

Operating Principles Overview 49

2.1.6 Ink System Mechanism

Ink system mechanism consists of pump unit (include the CR lock lever) and capping mechanism. Ink system mechanism drives the pump unit that presses cap to the printhead and ejects ink from ink cartridge, head cavity and cap to the waste ink pad.

2.1.6.1 Pump Unit & Wiper mechanism

The pump unit is driven by PF motor. PF motor drive is always transmitted to the paper feeding mechanism and pump unit through the following gears. Refer to the Figure 2-23.

The Pump unit and Wiper mechanism drives according to the PF motor rotational direction, as shown in the right table.

Table 2-3. PF motor rotational direction & Ink System Mechanism

(*1): The PF Motor rotational direction = seen from the right side of the printer.

Following figure shows the overview of the pump mechanism operation.

Figure 2-22. Pump mechanism

Figure 2-23. PF motor drive transmission path to the Pump unit

Directions Functions

Counterclockwise (*1)

• Sets the wiper.

• Absorbs ink by the pump unit

• Set the CR lock lever

Clockwise (*1)

• Resets the wiper.

Spur Gear 19.2

Pump unit drive Gear

Page 50

EPSON Stylus COLOR C70/C80 Revision A

Operating Principles Overview 50

2.1.6.2 Capping Mechanism

The capping mechanism covers the printheads with the cap holder to prevent the nozzle from increasing viscosity when the printer is in stand-by mode or when the printer is off. This product has valveless cap system. Air valve function used for the previous models pumps and ejects ink only inside the cap by absorbing ink with the valve open. By opening the Air valve, the negative pressure is decreased and only the ink inside the cap is ejected. (the ink is not absorbed from Ink cartridge or head cavity.) But, valveless cap system, this operation is done out side of the capping area. The CR moves to left side of the Cap assembly and the pump absorbs the ink inside the cap.

1. Due to rationalization, there is no sponge inside the cap.

2. Previously the sponge was provided to prevent frothing during cleaning.

3. Now, since the shape of new cap prevents frothing by its-self, it is not necessary to attach a sponge on the cap.

Figure 2-24. Cap Mechanism

Viewed front side

CR unit

Print Head

Slide up

Slider cap

Cap

Page 51

EPSON Stylus COLOR C70/C80 Revision A

Operating Principles Electrical Circuit Operating Principles 51

2.2 Electrical Circuit Operating Principles

The electric circuit of the Stylus COLOR C70/C80 consists of the following boards.

 Main board: C424 MAIN-B Board

 Power supply board: C424 PSB/PSE Board

This section provides operating principles of C424 Main-B Board and C424 PSB/PSE Board. Refer to Figure 2-25 for the major connection of the each boards and their roles.

Figure 2-25. Electric Circuit

2.2.1 C424 PSB/PSE board

The power supply boards of Stylus COLOR C70/C80 use a RCC (Ringing Chalk Converter) circuit, which generates +42VDC for drive line and +5VDC for logic line to drive the printer. The application of the output voltage is described below.

Table 2-4. Application of the DC Voltages

AC voltage input from AC inlet first goes through filter circuit that removes high frequency components and is then converted to DC voltage via the rectifier circuit and the smoothing circuit. DC voltage is then lead to the switching circuit and FET Q1 preforms the switching operation. By the switching operation of the primary circuit, +42VDC is generated and stabilized at the secondary circuit. This +42VDC generated by the secondary circuit is converted to +5VDC by the chopping regulator IC of the secondary circuit.

C424 MAIN-B

C424 PSB/PSE Board

1. CSIC

2. CR ENC.

3. PF ENC.

4. Head Temp.

Head Driver Board

PF Motor

CR Motor

Printer Mechanism

+42VDC

+5VDC

PE Actuator

+3.3VDC

via IC9

+5VDC

Panel

Voltage Application

+42VDC

• Motors (CR Motor, PF Motor)

• Printhead common voltage

• Printhead drive voltage

+5VDC

• Source of C424 MAIN-B logic (Actually 3.3VDC is used.)

• Source of Sensor

Page 52

EPSON Stylus COLOR C70/C80 Revision A

Operating Principles Electrical Circuit Operating Principles 52

Figure 2-26. C424PSB/PSE Board Block Diagram

The C424 PSB/PSE board has the various control circuits to stop voltage output if a malfunction occurs on the power supply board or the main board while the printer mechanism is on duty. Following explains each control and protection circuit.

1. Regardless of the state of the power switch (On or OFF), the voltage is always applied to the primary side of the power supply board from the moment or at the state that AC-plug is plugged in. At this time, F1 plays a role of preventing AC120 to 220V from coming into the F1. L1 also prevents high harmonic wave noise generated in the RC circuit filter which consists of C1 from going out, and eliminates the noise from outside here.

2. The AC is full-wave rectified by the diode bridge DB1, and converted to x AC in voltage by the smoothing electrolytic capacitor C11.

3. The pressured up direct current turns Q1 on through the starting resistor R18 and R28 starts the primary side of the circuit.

4. When the primary side is On, the energy (current) led by the electromagnetic induction through the trans (T1) does not flow to the secondary side since the diode (D51) on the secondary side is installed in the opposite direction.

5. When the energy which is charged in the trans is reaching the saturated state, the voltage which makes Q1 on becomes weak gradually. At the point that this voltage drops at the certain voltage, C13 absorbs the current in the opposite direction and Q1 is quickly shut off by the resulting sharp drop.

6. When the primary side is turned off, the energy charged in the T1 is opened according to the diode(D51) direction which is installed on the secondary side. Basically, 42 V DC is output by these circuit operations and the number of T1 spiral coil.

7. +5VDC is generated by pressured down this +42VDC as power supply. IC51 pressures down the +42VDC and generates precise +5VDC by chopping off the output, forming the standard santooth wave form by the outer RCC integration circuit.

The C424PSB/PSE board has the various control circuits to stop voltage output if a malfunction occurs on the power supply board or the main board or while the printer mechanism is on duty. Following explains each control and protection circuit.

 +5V line over voltage protection circuit:

This protection circuit is in the same line as the +42V over voltage protection circuit is located. The output voltage level of the +5V line is monitored by a Zener diode.(ZD53) This circuit shuts down the +5V line forcefully when the voltage level exceeds +7V.

+5VDC Line

Control Circuit

+42VDC Line

Over Voltage

Limitation

+42VDC Line

Drop Limitation

+42VDC Line

Constant

Control

Smoothing

Circuit

+5V Regulator

Power Drop

Delay Circuit

Photo Coupler

TRANS(T1)

PSC Sigual from

Main board

ZD53

+5VDC+42VDC

IC51

Q91, ZD51

ZD52, 87

ZD90

C84, Q84

C51

Q1C11

D51

Q2, Q31, Q32

Abnomal Feed

back circuit

Main

Switching

Circuit

Smoothing

Circuit

Over Current

Protection

Filter Circuit

Full Wave

Rectifier circuit

DB1

L1, C1

F1, TH1

AC Input

PC1

Page 53

EPSON Stylus COLOR C70/C80 Revision A

Operating Principles Electrical Circuit Operating Principles 53



+42VDC line drop limitation circuit: This protection circuit is in the same line as +42V over voltage protection circuit is located. The output voltage level of the +42V line is monitored by a Zener diode.(ZD90) This circuit shuts down the +42V line forcefully when the voltage level drops to +36V.

 +42VDC line over voltage circuit:

This circuit is in the same line as +5V line over voltage protection circuit is located. The output level is monitored by two Zener diodes.(ZD52, 87) If the voltage level exceeds +48VDC, this circuit shuts down the +42V line forcefully.

 +5V line control circuit:

The output current is monitored by the +5VDC generation switching control IC (IC51), which also monitors the output voltage. This information is input to the internal comparator and stabilizes +5V line.

Page 54

EPSON Stylus COLOR C70/C80 Revision A

Operating Principles Electrical Circuit Operating Principles 54

2.2.2 C424 MAIN-B Board

The printer mechanism is controlled by C424 MAIN-B. See Figure 2-27 for the C424 MAIN-B board block diagram.

Figure 2-27. Block Diagram for the C424 MAIN-B Board

Following shows you the major characteristic of this main board.



Use of the 3.3V chips in the logic circuit The 3.3 V regulator (IC7) on the C424 MAIN-B produces 3.3 V by pressuring down the 5.5 VDC, also generated on this board, to drive several chips. See the table below that separately shows the chips driven by the +5V and +3V.

Table 2-5. 3.3V Drive Chips & 5.5V Drive Chips



Lithium battery are not mounted. (Stylus C70) Unlike the previous products, the Lithium battery is not mounted on the Main board. So, this product perform the Power-on cleaning or Timer cleaning based on the time command which is sent from the printer driver.

 On the other hands, Stylus C80 has a timer circuit in IC6. This IC6 is the hybrid IC

including EEPROM, Reset circuit and timer circuit. Also, this IC6 has a big capacity capasitor inside IC. Insted of previous lithium battery.

 DRAM

4Mbit for the Stylus C70 and 16Mbit for the Stylus C80 DRAMS are mounted on the Main board.

 One CPU controls the all function on the main board.

 PROM both

8Mbit for Stylus C70 and stylus C80 is mounted on the Main borad. The timer IC is inside the C80 EEPROM.

D-RAM 4M

C70 (IC5)

D-RAM 16M

C80 (IC3)

Address

Data

P-ROM

(IC2)

E01A27CA ASIC (IC7)

Motor Driver

(IC8)

Common

Pre-Driver (IC13)

Parallel I/F IC

(IC4)

Q9&Q10

CN3 USB

CN14

CN13

CN9

CN8

CN1 Parailel I/F

Head

PF Motor

CR Motor

C70 EEPROM(IC18) Reset IC(IC1) C80 EEPROM(IC6) Reset IC(IC6) Timer IC(IC6)

+5V +3.3V

I/F circuit (IC4) Panel (LED) Motor Driver (IC13) Print head Pre-Driver (IC8)

CPU-ASIC 2 in 1 (IC7) PROM (IC2) DRAM (IC5 or IC3)

Page 55

EPSON Stylus COLOR C70/C80 Revision A

Operating Principles Electrical Circuit Operating Principles 55

2.2.2.1 Main elements

Table 2-6, Table 2-7 shows the function of the each main elements on C424 MAIN-B.

Table 2-6. Main Elements of the C424 MAIN-B (Stylus COLOR C70) Table 2-7. Main Elements of the C424 MAIN-B (Stylus COLOR C80)

IC Location Function

CPU-ASIC 2 in 1 E01A27CA

IC7

8KB CPU mounted on the MAIN board is driven by clock frequency 24MHz and controls the printer.

PROM IC2

• Capacity 8Mbit(Version : THDXX), Bus = 16bit

• Program and CG for CPU (G: 2 characters)

DRAM IC5 Bus = 16bit, 4Mbit DRAM

EEPROM IC18

2kbit EEPROM

• Default value setting

• Parameter backup

• For displaying raster data

Reset IC IC1

Reset IC

• For +3.3V; reset when +2.5V is detected

• For +5V ; reset when +4.2V is detected

• For +42V ; reset when +36.7V is detected

Common Pre-Driver

IC13

Head drive control HIC

• Generates head common voltage.

Motor Driver IC8 CR/PF motor drive IC

Parallel I/F IC IC4 IEEE1284 parallel I/F transceiver IC.

IC Location Function

CPU-ASIC 2 in 1 E01A27CA

IC7

8KB CPU mounted on the MAIN board is driven by clock frequency 24MHz and controls the printer.

PROM IC2

• Capacity 8Mbit(Version : THEXX), Bus = 16bit

• Program and CG for CPU (CG: 38 charactors)

DRAM IC3 Bus = 16bit, 16Mbit DRAM

HIC IC6

[RTC] Electric double layer condenser

[Reset]

• For +3.3V; reset when +2.5V is detected

• For +5V ; reset when +4.2V is detected

• For Power; reset when +36.0V is detected

[EEPROM] 2kbit EEPROM

• Default value setting

• Parameter backup

Common Pre-Driver

IC13

Head drive control HIC

• Generates head common voltage.

Motor Driver IC8 CR/PF motor drive IC

Parallel I/F IC IC4 IEEE1284 parallel I/F transceiver IC

Page 56

EPSON Stylus COLOR C70/C80 Revision A

Operating Principles Electrical Circuit Operating Principles 56

2.2.2.2 Printhead Driver Circuit

The printhead driver circuit consists of the following two components:

 Common driver IC (IC13 : E09A38RA) directly attached to the C424 MAIN-

B board.

 Nozzle selector IC on the head board.

The common driver (IC13 : E09A38RA) generates a reference drive waveform according to the output signals from the C424 MAIN-B board. The reference drivewaveform is amplified by the transistors Q9 and Q10 and then transferred to the nozzle selector IC on the head board. Print data is converted to serial data by the CPU (IC7) and then sent to the nozzle selector IC on the head board. Based on the serial data, the nozzle selector IC determines the nozzles to be actuated. The selected nozzles are driven by the drive waveforms produced by the common driver. See Figure 2-28 for the printhead driver circuit block diagram.

 Head common driver circuit

The reference head drive waveform is produced in the common driver (IC13 : E09A38RA) based on the following 12 signal lines output from the ASIC (IC7 ); A0-A4, CLK1, CLK2, FLOOR, RST, DATA, DCLK, and E. By the DATA signal output from the CPU (IC7), the original data for the head drive waveform is written in the memory in the IC13. The addresses for the written data are determined by the A0 - A4 signals, and, of among, data used to determine the waveform angles is selected. Then, setting the selected data, producing trapezoid waveform value, and canceling the data are performed by the rising edges of the CLK1 and CLK2 signals.

 Head nozzle selector circuit

Printing data is converted into serial data by the CPU (IC7). Then the converted data is allocated to the six rows, the number of the head nozzle rows, to be transferred to the nozzle selector through the seven signal lines (HS01 to HS07). Data transmission from the CPU (IC7) to the nozzle selector synchronizes with the LAT signal and SCK clock signal. Referring to the transferred data, nozzles to be activated are selected, and the PZTs of the selected nozzles are driven by the drive waveform output from the head common driver.

 Abnormal tempertature detection circuit

Feed back signal from Pin12 and Pin10 in Cn9 are used to head tempertature detection. If the temp. inside the head increases 120°C, Printer stops current printing, then make either black or color (YMC) ink cartridge set to ink out.

Figure 2-28. Printhead Driver Circuit

IC7 CPU

E01A27CA

IC13 CPU

Common

Pre-Driver

HWA0 HWA1 HWA2 HWA3

HWA4 HWCLK1 HWCLK2

HWFLR HWRST

HWSDATA

HWSCLK HWSLAT

27 28 29 31 32 33 22 21 20 26 25 24

28 27 26 25 24

3 4 5 6

A0 A1 A2 A3 A4 CLK1

CLK2

FLOOR RST

DATA DCLK E

DAOUT

VCC45

NPNB

PNDB

VCC5

I/O

DP8

DP6

DP7

DP5 DP4 DP3

DP2 DP1

GND5

GND45

VOUTGND

22 20 18 16

23 2 21 19 17 15 13 12 11 9 7 10 14

2 4 6 8

25 24 22 20

COM COM COM COM

COM COM COM

LHT

VHV

CN8

CN9

+42V

+5V

HLAT

HCH

HNCHG

HSOCLK

HSOCMD2

HSOCMD1

C-P41 C-P42

51 50

52 48

46 47

56 57

6 2

4 12 10

NCHG

SCK SI2

SI1 AND1 AND2

COM

Page 57

EPSON Stylus COLOR C70/C80 Revision A

Operating Principles Electrical Circuit Operating Principles 57

2.2.2.3 CR / PF Motor (PF/ PUMP/ ASF Motor) Driver Circuit

The motor driver IC (IC8) on the MAIN board drives CR / PF motor. This product uses DC motor and performs constant current PWM drive.

CPU (IC7) converts CR / PF motor REF control signal to A3974 micro step drive form and outputs to motor driver IC (IC8)A3974 from port 52, 63. Based on this signal, IC8 determines the REF mode.

The current value on each phase is determined by CPU (IC7) and outputs from port 138 pin to driver IC (IC8). Motor driver IC generates motor driver waveform based on a input signal and controls the motor. If the printer dose not receive any data from PC for 5 minutes, CPU set the motor drive current to 0 via port 138 pin and the motor drive is turned off to save the power consumption. The initial bit of the serial data that is output from pin 183 is set to a command that specifies whether the CR motor or the PF motor is to be driven. This product does not carry out any operations in which the CR motor and the PF motor are driven simultaneously, and so control is possible using a single serial data line.

Figure 2-29. CR/PF Motor Driver Circuit Block Diagram

2.2.2.4 Reset Circuit

Reset circuits consist of the rest IC (IC6 : Stylus COLOR C70, IC1 : Stylus COLOR C80). Reset circuits are mounted on the MAIN board to monitor the two voltages: +5V for the logic line and +42V for the drive line. When each circuit detects abnormality on the corresponding line, it outputs a reset signal to reset CPU (IC7). This function is necessary to prevent the printer from operating abnormally. This IC monitors both +5V and +45 lines but can reset them independently. The reset circuits outputs reset signal when +5V line becomes 4.2V or lower or +42V line becomes 33.2V or lower.

Unlike the previous products, Stylus C70 has no timer IC and both C70 and C80 have no Lithium battery on the main board.

Figure 2-30. Reset Circuit Block Diagram

Main signal lines are explained below;

 OUT1: Interrupt signal

 OUT2: Reset line

 IN: +42V line monitoring line

 VCC: +5V line monitoring line

IC7

E01A27CA

IC8

A3974

CLK4M

C_P46

C_P47

RST_DCMCU

SDATA_DCMCU

TIOCAO

SCLK1_DCMCU

SLD1_DCMCU

TIOCA3

184

183

191

188

189

197

VDC

OSC REF1

REF2

SLEEP

DATA

ENABLE1

CLOCK

STROBE

ENABLE2

GND

1, 2

22, 23, 24

33, 34, 35

VBB1

VCP

VBB2

OUT 1A

OUT 1B

SENSE1

CP1

CP2

VREG

OUT 2A

OUT 2B

SENSE2

GND

CN14

CN13

+5V +42V

+42V

Motor

181

IC1

MN1347AFFE

IC6

RTC9822SA

NC1

NC2

GND

MRES

VCC

OUT1

OUT2

VDD

VI5

VDD2

VEX

VSS

NON

IRQ

CLK

EXO

FRST

RST

ECS

ECK

EDO

EDI

NMI

MRES

RESET

VLE

166

167

168

171

173

165

172

175

IC7

E01A27CA

C70

C80

+5V

+3.3V

C70

C80

+3.3V

+42V

Page 58

EPSON Stylus COLOR C70/C80 Revision A

Operating Principles Electrical Circuit Operating Principles 58

2.2.2.5 EEPROM Control Circuit

Since EEPROM is nonvolatile memory, it keeps written information if the printer power is turned off. When the printer is turned ON, CPU (IC7) reads data from EEPROM (IC6 : Stylus COLOR C70, IC18 : Stylus COLOR C80) via the RAM and when the power is turned OFF it stores data to EEPROM via the RAM.

Information stored in EEPROM is listed below.

 Various ink counter (I/C consumption counter, waste pad counter, etc.)

 Mechanical setting value (Head ID, Bi-D adjustment, USB ID, etc.)

See Table 7-8, “EEPROM Address Map,” on page 187 that provides detailed information on the values stored in EEPROM.

Figure 2-31. EEPROM Circuit Diagram

EEPROM is connected to CPU with 4 lines and each line has the following function.

 CS: Chip selection signal

 SK (CLK): Data synchronism clock pulse

 DI: Data writing line (serial data) at power off.

 DO: Data reading line (serial data) aPEPEt power on.

NOTE: Items with brackets are for the C80, and items without brackets are for

the C70.

2.2.2.6 Sensor Circuit

C424 MAIN-B is equipped with the following one sensor to detect the status of the printer. Unlike the previous product, ASF HP sensor and HP sensor are not equipped and the ASF HP is determined with the clutch mechanism (“Paper Feeding Mechanism”).



PE Sensor

This sensor uses photo interrupter method and detects the following two status. The photo interrupt component and two detection levers consists of this sensor.

 Paper Top & End position

When the Paper is in the paper path, this sensor outputs the HIGH signal. When the Paper is not in the paper path, this sensor outputs the LOW signal. This status is always monitored during the printer is in the power on status with this sensor.



Thermistor (THM)

The thermistor is attached directly on the printhead driver board. It monitors the temperature around the printhead and determines the proper head drive voltage according to the ink viscosity that varies by the temperature. This information is fed back to the CPU analog port. When the temperature rises, the head drive circuit lowers the drive voltage: When the temperature lowers, the head drive circuit rises the drive voltage. This circuit is different from head inside temperature detection circuit. (Please refer to page -56 for details.)



Linear Scale & CR Encoder

To make the current CR position manage, CR encoder always monitors the barcode on the linear scale during CR motor drivers. Also this model has no HP sensor and judges the home position when the CR goes out of step at right side.



Rotary Scale & PF Encoder

To make the paper feed pitch precisely. PF encoder always monitors the bar-code on the rotary scale during PF motor drivers.

The block diagram for the sensor circuit is shown below

IC7

E01A27CA

IC18 (IC6)

EEPROM-93C

+5V

VCC

ORG

GND

166

167

168

171

ECS

ECK

EDI

EDO

4 (2)

3 (3)

2 (4)

1 (5)

+5V

(CLK)

Page 59

EPSON Stylus COLOR C70/C80 Revision A

Operating Principles Electrical Circuit Operating Principles 59

Figure 2-32. PE Sensor Circuit Diagram & Head Around Temperature

IC7

E01A27CA

HLAT

HCH

HNCHG

HSOCLK HSOCMD2 HSOCMD1

C_P41 C_P42

SWA1

50 52

48 46 47

56 57

178

6 2 4

12 10

LAT CH NCHG

SCK SI2 SI1

AND1 AND2

CN9

Head FFC

PE Sensor

+3.3V

Page 60

CHAPTER

TROUBLESHOOTING

Page 61

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 61

3.1 Overview

This chapter describes how to troubleshoot problems. It consists of the sections shown in the flowchart below. When identifying and troubleshooting problems, be sure to proceed to the correct section specified in the flowchart.

Figure 3-1. Troubleshooting Flowchart

Following sections show detailed information on each step in the flowchart. Be sure to perform troubleshooting without neglecting the correct order specified in each section.

W A R N I N G



Be careful to avoid electric shocks when checking the electrical circuit boards (C424 MAIN-B, PSE and B circuit boards) while the power is turned on.



When touching parts such as the FETs or the surface of the heat sink on the transistor with one hand, never touch other metallic parts of the mechanism with your other hand, as the chance of receiving an electric shock at such times is extremely high.

C H E C K

P O I N T



Disassembly and reassembly of parts is often required when identifying the causes of problems. The parts should be disassembled and re-assembled correctly while referring to "Chapter 4 Disassembly and Assembly" so that the operation and status of each check item can be correctly verified.



Some individual part and units may require adjustment once they are removed or replaced. If removing or replacing parts which have specific instructions for adjustment included in "Chapter 4 Disassembly and Assembly", be sure to make these adjustments after repairing the problem location.

START

Communication Error

(Section 3.1.1)

Too Late Throughput

(Section 3.1.2)

Status Monitor does not work (Section 3.1.3)

Is the printer power on?

Troubleshooting with LED Error Indications (Section 3.1.4)

Isolating the Faulty Part

according to the

Phenomenon

(Section 3.1.6)

Isolating the faulty part on the Power Supply Board. (Section 3.1.5)

Yes

Page 62

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 62

3.1.1 Communication Error

This section describes the procedures for solving the problem when no communication at all is received from the computer after the printer power has been turned on, even when initialization has completed normally and the printer is at the standby condition.

3.1.2 Too Late Throughput

This section describes the procedures for checking printers that have been returned because the printing speed suddenly became much slower after having operated normally up until then. Basically this problem is unlikely to occur in Windows and Macintosh environments because the printer driver is used to transmit data and commands, but it is possible that customers using the printer in a DOS environment may experience this problem.

NOTE: If the problem does not disappear or if it cannot be reproduced when

these checks are carried out, refer to "CR Motor Operation Abnormal" in Section 3.1.6.11.

Table 3-1. Communication Error Checking Point

Step Check Point Remedy

1 Is the customer's

I/F cable broken?

If communication is possible at all times while working, proceed to the next step. If communication is not possible, change the interface from parallel to USB or vice versa and check if communication is then possible. If there is still no communication, continue to the next step.

2 Use the

adjustment program to check the 60H address (interface protocol setting) for the EEPROM.

The relationship between the interface protocol setting status and the setting values is given below.

00H: Auto (Default value; communication problems should

never occur with this setting.)

01H: Fixed to Parallel (Communication problems occur when

using USB)

02H: Fixed to USB (Communication problems occur when

using parallel)

To reset, use the Dump function of the adjustment software to rewrite the setting to the default (00H). The relationship between the interface protocol setting status and the setting values is given below. For details, refer to Chapter 5.

NOTE:

The Stylus COLOR C80 has a default setting function, but unlike previous models, interface protocol selection is not possible. Furthermore, the Stylus COLOR C70 does not have its own default setting function. Even if the default value (00H) is changed to 01H or 02H, the EEPROM data may become corrupted, so even if the communication problem is fixed, there is a high possibility that the various adjustment values may be distorted. Because of this, all parameter electrical adjustments should be carried out afresh. Refer to Chapter 5 for details.

3 EPSON USB Port

(Only for USB User)

If no problems occur when the above two checks are carried out, check with the customer whether the USB port has been installed correctly or not, and if necessary get the customer to reinstall the driver and re-check. (However, this is only for customers who are using USB.)

Table 3-2. Too Late Throughput

Step Check Point Remedy

1 Use the adjustment

program to check the 50H address for the EEPROM.

The relationship between the setting status and the setting values is given below.

00H: Bi-D 01H: Uni-D 02H: Auto

To reset, use the Dump function of the adjustment software to rewrite the setting to the default (02H). The relationship between the interface protocol setting status and the setting values is given below.

00H: Auto (Default value; communication

problems should never occur with this setting.)

01H: Fixed to Parallel (Communication problems

occur when using USB)

02H: Fixed to USB (Communication problems

occur when using parallel)

To reset, use the Dump function of the adjustment software to rewrite the setting to the default (00H). Refer to Chapter 5 for details.

NOTE:

The Stylus COLOR C80 has a default setting function, and it can be used for setting this item also, so that the setting can be returned to the default without using the adjustment software.

Page 63

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 63

3.1.3 Status Monitor does not operate

This section describes the procedures for checking printers when the Status Monitor suddenly can no longer be used to check the printer status, even though the Status Monitor has been operating normally before.

Table 3-3. Communication Error Checking Point

Step Check Point Remedy

1Use the

adjustment program to check the 64H address (IEEE 1284.4 for parallel) for the EEPROM.

The relationship between the IEEE 1284.4 for Parallel setting status and the setting values is given below. 00H: Auto (Status cannot be sent to the computer when the printer has

an error)

01H: On (Default: Status can be sent to the computer even if the

printer has an error)

02H: Off (Status cannot be sent to the computer regardless of the

printer status)

To reset, use the Dump function of the adjustment software to rewrite the setting to the default (01H). Refer to Chapter 5 for details.

NOTE:The Stylus COLOR C80 has a default setting function, but

there is no function available for the customer to change the setting for the 64H address. Furthermore, the Stylus COLOR C70 does not have its own default setting function. Even if the default value (01H) is changed to 00H or 02H, the EEPROM data may become corrupted, so even if the communication problem is fixed, there is a high possibility that the various adjustment values may be distorted. Because of this, all parameter electrical adjustments should be carried out afresh. Refer to Chapter 5 for details.

2 Use the

adjustment program to check the 65H address (IEEE 1284.4 for USB) for the EEPROM.

The relationship between the IEEE 1284.4 for Parallel setting status and the setting values is given below. 00H: Auto (Status cannot be sent to the computer when the printer

has an error)

01H: On (Default: Status can be sent to the computer even if the

printer has an error)

02H: Off (Status cannot be sent to the computer regardless of the

printer status) To reset, use the Dump function of the adjustment software to rewrite the setting to the default (01H). Refer to Chapter 5 for details.

NOTE:The Stylus COLOR C80 has a default setting function, but

there is no function available for the customer to change the setting for the 65H address. Furthermore, the Stylus COLOR C70 does not have its own default setting function. Even if the default value (01H) is changed to 00H or 02H, the EEPROM data may become corrupted, so even if the communication problem is fixed, there is a high possibility that the various adjustment values may be distorted. Because of this, all parameter electrical adjustments should be carried out afresh. Refer to Chapter 5 for details.

3Has the

printer driver been installed correctly?

If the problem cannot be reproduced at the Service Center, get the customer to reinstall the driver and re-check.

Table 3-3. Communication Error Checking Point

Step Check Point Remedy

Page 64

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 64

3.1.4 Troubleshooting with LED Error Indications

This section describes how to troubleshoot the problem when the printer indicates an error at power on and can not print. The Stylus COLOR C70/C80 can detect the following seven errors and indicates them with the LEDs, as shown below.

NOTE: No.5 ink low indication is not error, and it means just status indication

for the user.

NOTE: “–” means the LED is not affected by the error condition.

See the following tables which show the error conditions and corresponding possible causes.

This section describes the procedures for solving the problem when an error is displayed. Refer to the table below and carry out each check in the order given. If you are unsure of the detailed procedures, refer to the section indicated in the table and use the instructions given in that section as a reference.

Table 3-4. Error Indication

No. Error Status

Indication

Power Ink Load/Eject

1Paper Out ––On

2 Double Feed – – On

3Paper Jam – Off Blink

4 Ink out or ink cartridge out – On –

5 (Ink Low) – Blink –

6 Maintenance request Blink Blink Blink

7 Fatal error Blink On Blink

Table 3-5. Relationship between Error Indication and Presumption Cause

No. Error status

Probable cause

1Paper Out

(Refer to Section

3.1.4.1)

1. The paper feed roller's ability to pick up the paper has dropped.

2. One or both of the two hooks that secure the hopper to the ASF are disengaged.

3. There is a piece of paper lodged in between a paper load sub roller and the PF roller.

4. The bushing at the left of the PF roller is dislodged from the mechanism and is not rotating smoothly.

5. The powder coating on the PF roller shaft is extremely dirty or has sections that are missing powder.

6. The EJ roller holder is not secured to the paper eject roller shaft and is loose.

7. The bushings 5 are not securing both ends of the paper eject roller shaft and the whole shaft is loose, or the shaft rotation is not stable.

8. Some of the toothed rollers (star wheels) on the paper eject frame have fallen down or are not secured properly.

9. The PE lever for the PE sensor is not installed correctly, or is loose, or the end of the lever is broken.

10.The PE lever for the PE sensor is installed correctly, but the lever does not operate correctly.

11.The spring at the bottom of the separation pad on the ASF has come off and fallen down, and the paper cannot travel correctly.

12.The EJ grounding wire or the PF grounding wire has come off and is obstructing the paper path.

13.The surface of the linear scale that passes through the underside of the carriage is contaminated with paper dust.

14.The space between the emitter and receiver of the photo sensor on the underside of the carriage is blocked by paper dust, or the linear scale is not in the middle position and when the carriage is moved manually, it touches against the emitter or the receiver.

15.The FFC is disconnected from connector CN1 on the circuit board underneath the carriage, or when you try to push it in it feels as if it can go in further.

2 Double Feed

(

Refer to Section

3.1.4.1

)

3Paper Jam

(

Refer to Section

3.1.4.1

)

Page 65

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 65

(Cont.)

Paper Jam (Refer to Section

3.1.4.1)

16.The paper back lever has come off and fallen down, and the paper back function does not work.

17.The projection on the ASF rib for inserting the paper back lever is broken, and the paper back lever falls off as soon as it is reinstalled.

18.The spring that applies tension to the paper return lever has come off and fallen down.

19.One or more of the four points that secure and control the hopper drive shaft have become loose, and the hopper cannot operate according to control instructions.

20.Malfunction of the PE sensor.

21.Paper that is outside specifications or that is longer than the currently-set paper size is being used.

NOTE:If paper out, double feed or a paper jam is detected,

they may all occur for the any of the above reasons, and so the reasons are listed all together without being separately classified.

4 Ink end or ink

cartridge out (Refer to Section

3.1.4.2)

1. The cartridge is not correctly inserted, and the cartridge cannot be correctly detected.

2. The CSIC chip is not connected correctly, or it is completely disconnected and communication with the main unit is not possible.

3. The contact electrodes of the carriage CSIC chip are broken or bent.

4. The FFC is disconnected from connector CN1 on the circuit board underneath the carriage, or when you try to push it in it feels as if it can go in further.

5. Connector CN8 on the main board is disconnected or nearly disconnected.

6. A heat hot error has occurred.

7. The actual amount of ink remaining and the remaining ink data recorded in the CSIC EEPROM are mismatched as a result of a refilling operation.

8. The data in the CSIC EEPROM is corrupted.

5 Ink Low Indication

(Refer to Section

3.1.4.3)

No error status is indicated, but an ink low indication continually appears while the carriage is returning to the home position even though the I/C has been replaced with a new I/C. (Example of actual question from the marketplace)

Table 3-5. Relationship between Error Indication and Presumption Cause

No. Error status

Probable cause

6 Maintenance Error

(Refer to Section

3.1.4.4)

Ink overflow request always appears.

7 Fatal error

(Refer to Section

3.1.4.5)

1. The linear scale is not moving in between the photo sensor (photo coupler) parts on the underside of the carriage.

2. The FFC for transmitting the carriage photo sensor detection signal to the main board is disconnected or almost disconnected from the relay board on the underside of the carriage.

3. The rotary scale is not moving in between the PF encoder (photo coupler) parts.

4. CN12 (white: 4-pin) on the main board is disconnected.

5. CN8 on the main board is disconnected or almost disconnected.

6. The coil inside the CR motor has seized.

7. The coil inside the PF motor has seized.

8. Malfunction of motor driver IC

9. Malfunction of PF motor photo sensor

10.Malfunction of CR motor photo sensor

Table 3-5. Relationship between Error Indication and Presumption Cause

No. Error status

Probable cause

Page 66

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 66

3.1.4.1 Remedy when a paper out, double feed or paper jam error occurs

This section provides check points and corresponding actions which are necessary when the Paper Out Error problem has occurred because of either of the following reasons:

 Paper is set in the ASF hopper but not fed.

 Paper is fed but not detected by the printer.

Indicates the checks and remedies to be carried out if the paper feeds normally and the printer can recognize this, but the paper jams during printing or when it is being ejected.

Be sure to follow the steps in the order described in the tables.

NOTE: If the finding for the question is Yes, take the action described in the right

column. If “No”, proceed to the next step.

Table 3-6. Communication Error Checking Point

Step Check Point Remedy

1 Is no paper loaded? Set a cleaning sheet in the ASF up side down. Then holding

the top edge, press the Load/Eject button, and the micro pearl on the paper load roller (a semicircular roller) surface is removed. To remove severe smear, staple a cloth moistened with alcohol to a post card and clean the roller in the same manner.

NOTE:

Customers must never use cleaning sheets with this printer. The procedures described here is for use only by qualified technicians when carrying out repairs.

2 Has the hopper come

away from the ASF?

If the two hooks that secure the hopper to the ASF are not correctly attached, insert the hooks correctly into the holes in the ASF.

Non-adhesive Area

(Use a post card

for the base sheet.)

CL Sheet

Adhesive Area

This side down

Staplers

Cloth moistened

with alcohol

Hooks

Page 67

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 67

3 Is there any paper

lodged in between a paper load sub roller and the PF roller?

Clean away any paper or other foreign particles that may be caught in the rollers.

4 Is the PF roller

bushing dislodged from the mechanism and not rotating smoothly?

Return the bushing to the correct position.

5 Is the PF roller

bushing dislodged from the mechanism and not rotating smoothly?

Use a cloth moistened with alcohol to clean away severe contamination. If the PF roller is damaged, it should be replaced.

Table 3-6. Communication Error Checking Point

Step Check Point Remedy

Slip of paper or foreign substance.

Correct Location

Busing for PF Roller Shaft

Many Paper Powders or a Big Scratch Marks

on the PF Roller Shaft

6 Is the EJ roller holder

not secured to the paper eject roller shaft and is it loose?

Place the EJ roller holder in the correct position.

7 Has the bushing 5 that

secures the paper eject roller shaft come away from the hook and is not rotating smoothly?

Place the bushing 5 in the correct position.

8 Have any of the star

wheels come away from the paper eject frame?

Place the star wheels in the correct position.

Table 3-6. Communication Error Checking Point

Step Check Point Remedy

Lifted EJ Roller Holder

Bush 5

Correct Hook Point

Correct StatusIncorrect Status

Page 68

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 68

9 10 11

Does the PE lever not work correctly?

Move the PE lever at the rear of the printer manually and check if it returns normally as soon as it is released. If it does not return, the cause might be one of the following three reasons.

1. The PE lever has come away from the base.

2. Scraps of paper have collected around the PE lever so that the PE lever cannot operate correctly.

3. The PE lever itself is broken and cannot detect the paper feed and paper eject timing correctly.

If the tension spring for the PE lever has come off, reinstall it while referring to the illustration below.

Table 3-6. Communication Error Checking Point

Step Check Point Remedy

Actuator for PE Sensor

PE Sensor

(Photo Coupler Type)

Torsion Spring

PE Lever

PE Lever Base

12 Has one of the

grounding wires become disconnected and is blocking the paper path?

Check both the PF grounding wire and the EJ grounding wire. If a wire is not in the correct position, pull it out and reinstall it in the correct position.

[PF Grounding Wire]

[EJ Grounding Wire]

Table 3-6. Communication Error Checking Point

Step Check Point Remedy

PF Grounding Wire

EJ Grounding Wire

PF Motor

Page 69

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 69

13 Is the surface of the

linear scale that passes through the underside of the carriage contaminated with paper dust?

If the surface is dirty, remove the linear scale and clean it with a cloth moistened with alcohol.

14 Is the inside of the CR

encoder on the underside of the carriage blocked with paper or dust? Also, is the position of the linear scale correct?

Look through the cut-away part of the mechanism at the home position side of the carriage and check if the encoder (photo coupler) is blocked with paper or dust. If it is blocked with paper or dust, use a cotton swab or similar to clean away the blockage.

In the same way as above, check the condition of the linear scale. Ideally the linear scale should be in the middle of the encoder, but it is okay if the carriage does not touch either end when it is moved manually.

Table 3-6. Communication Error Checking Point

Step Check Point Remedy

Dust or Smeared Points

CR Encoder

Liner Scale

15 Is the FFC

disconnected from connector CN1 on the circuit board underneath the carriage, or does it look to be okay but when you try to push it in does it feel as if it is slightly loose?

CN1 is the connector that handles the input and output of signals between the main board and the mechanism. It inputs the various encoder signals to the main board from the mechanism, and outputs head drive signals from the main board.

16 During paper back

(ASF reverse drive) operation, does the paper back lever not operate because it falls off, and does a double feed error always appear, or do paper jams always occur during paper feeding? Please Note that “Paper back lever” is located on backside of “Silent CAM”.

The paper back lever is inserted onto the ribbed shaft on the ASF right frame as shown in the photograph. Because of this, if the rib becomes broken, the paper back lever may fall off during operation. If the rib on the paper back lever shaft becomes broken, replace the ASF right frame or replace the ASF unit.

17 If the end of the paper back lever itself is broken, or if the

other rib on the underside of the paper back lever (not shown in the photograph) is broken and the two paper return levers (back flaps) inside the ASF unit cannot be operated, replace the paper back lever.

Table 3-6. Communication Error Checking Point

Step Check Point Remedy

Junction Board

CN 1

Rib

Shaft

Paper Back Lever

Page 70

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 70

18 The spring that

applies tension to the paper return lever inside the ASF has come off from its normal position, and so no tension is being applied.

The photograph below shows the normal setting position for the paper return lever tension spring.

19 The shaft that drives

the ASF hopper is secured in a total of four places. Has it come loose in one of these places, so that the incorrect timing or incorrect operation is occurring?

20 Malfunction of PE

sensor

Because the only sensor check point is pin 178 of the ASIC (IC7) port and the tester must be applied directly to the pin, testing is dangerous and difficult. This printer has the PE sensor directly installed, so it is recommended that checking the PE sensor should be carried out by replacing the circuit board and checking the operation. At this time, the head ID only should first be input to the EEPROM on the main board so that a head hot error does not occur. No other adjustments are required when carrying out checking.

Table 3-6. Communication Error Checking Point

Step Check Point Remedy

Paper Return Lever

Tension Spring

Check Point 1 Check Point 2

Check Point 3

21 If the customer uses

paper which is longer than the set paper length, no paper out indication will appear even though the printer sends the regular number of pulses, so is this causing a paper jam error to be recognized?

If the problem cannot be identified even after carrying out steps 1 to 19 above, the customer may have installed the printer driver incorrectly, so check the method of use and the printer driver settings directly with the customer.

Table 3-6. Communication Error Checking Point

Step Check Point Remedy

Page 71

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 71

3.1.4.2 Remedies for No I/C and Ink Out Errors

This section includes the check points and corresponding actions which are necessary when the black ink (or color ink) LED comes on or blinks at power on despite the ink cartridge has been replaced with a new one. Be sure to follow the steps in the order described in the tables.

NOTE: If the finding for the question is Yes, take the action described in the

following. If “No”, proceed to the next step.

Table 3-7. This section describes the procedures for solving the problem

when an ink out (cartridge out) error is displayed even though a brand-new ink cartridge has been installed.

Step Check Point Remedy

1 Has the cartridge not

been correctly inserted, so that the cartridge cannot be correctly detected?

Carry out the ink cartridge replacement operation and check if an ink out or ink cartridge out error occurs no matter which ink cartridge is used. Because the carriage moves to the position of the marking on the carriage, it is possible that an ink cartridge is not being detected. If a particular cartridge is not being detected, lift this cartridge up to the replacement position and then push it in firmly.

If the ink out indication disappears after the above operation has been carried out and the carriage has returned to the home position, the cause of the problem can be assumed to be the reason given at left. If this does not solve the problem, proceed to the next step.

NOTE:

This printer has sus-plates installed to the carriage in order to assist with securing and removal of the ink cartridges. The heights of the sus-plates that apply tension to each color ink cartridge can be changed in order to alert the customer to the fact that the cartridges have not been inserted correctly because they are uneven.

2 Is one or both of the two

hooks on the ink cartridge broken so that tension is not being applied?

NOTE:

Even if one hook is broken, the electrodes on the chip and the carriage will not contact correctly.

3 When the carriage CSIC

was mounted, did the sus-plate for applying tension to the CSIC fall down?

Because initial models did not have a cartridge clamp, the sus-plates had a stepped section so that the customer could check if the cartridges had been securely installed or not. If the cartridge was not securely installed, the tops of the various color cartridges would not be in a straight vertical line, and this would notify the customer that a cartridge had to be re-inserted. Correct installation of the ink cartridges is only achieved when the two hooks in No. 1 above and the tensions of the sus-plates mentioned here are normal.

Table 3-7. This section describes the procedures for solving the problem

when an ink out (cartridge out) error is displayed even though a brand-new ink cartridge has been installed.

Step Check Point Remedy

Hooks

Sus-Plate for pushing CSICs from the bottom side.

Hooks

CR Frame

Page 72

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 72

4 Has the IC chip

(EEPROM) that is mounted to the CSIC become detached or is it becoming detached?

If the CSIC chip is even slightly dislocated, the electrodes will not come into correct contact with the carriage electrodes and the printer will not recognize the cartridge.

NOTE:If an ink cartridge with no CSIC chip is installed,

not only will the ink cartridge fail to be recognized, but it will also damage the carriage electrodes.

5 Are the contact

electrodes of the carriage CSIC chip broken or bent?

Table 3-7. This section describes the procedures for solving the problem

when an ink out (cartridge out) error is displayed even though a brand-new ink cartridge has been installed.

Step Check Point Remedy

Correct Situation

Incorrect Situation Dislocated IC Chip

Electrodes

6 Is the FFC disconnected

from connector CN1 on the circuit board underneath the carriage, or does it look to be okay but when you try to push it in does it feel as if it is slightly loose?

Table 3-7. This section describes the procedures for solving the problem

when an ink out (cartridge out) error is displayed even though a brand-new ink cartridge has been installed.

Step Check Point Remedy

Junction Board

CN 1

Page 73

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 73

7 Is CN8 on the main

board is disconnected or almost disconnected?

Even though it is the same FFC, signals indicating the cartridge installation condition are not input to CN9.

NOTE:If CN8 and CN9 are inserted at an angle or if they

are almost disconnected from the connector, there is a high possibility that direct damage to the head may occur, and in the worst case, the head driving transistors (Q9 and Q10) on the main board and the print head itself may become damaged. Because of this, handle the FFC very carefully while working. When CN9 is disconnected and then reconnected and the power is turned back on, the fatal error is cleared, but if CN8 is disconnected, and the power is then turned back on, an unexpected Ink Out indication will appear and all of the currentlyinstalled ink cartridges must be replaced. This is because CN8 includes the signal that is used to monitor the internal head temperatures, so that if CN8 is disconnected the voltage becomes 0 V, or in other words an abnormal temperature has been detected. Accordingly, the power should not be turned on while CN8 is disconnected in order to avoid wastage of the ink cartridges.

Table 3-7. This section describes the procedures for solving the problem

when an ink out (cartridge out) error is displayed even though a brand-new ink cartridge has been installed.

Step Check Point Remedy

CN 9

CN 8

8 Has a head hot error

occurred?

1. Install a new ink cartridge and check if the problem returns to normal. If it does return to normal, the head hot error is probably the fault of the customer. The approach to head hot errors has changed from the Stylus COLOR 900/980, so that with this printer there is no way to check the history of whether head hot errors have occurred or not by checking the specified address in the EEPROM. The differences in heat hot errors between this printer and the Stylus COLOR 900/980 are given below.

1.1.The sequence for setting a flag inside the EEPROM to check if this is the 1st or 2nd occurrence has been eliminated.

1.2.Because of the above, automatic cleaning does not immediately occur when the first head hot error occurs.

1.3.However, if a heat ho t error really has occurred, the ink consumption status is forced to 100% and an ink out error is displayed so that the current status of the ink cartridges can be checked.

2. Apart from head hot errors which are the fault of the customer, there is a danger that these errors can occur as a result of repair service activity.

2.1.When the head is replaced, the TG value in the first digit of the head ID for the circuit board that is currently installed is ignored, and the power is turned on with the initial ink cartridges installed.

3. In conclusion, the ink cartridges must be replaced in the case of either item No. 1 and No. 2 above, but for the service problem in No. 2, use the adjustment program at the stage before inserting the cartridges to write the head ID for the currently-installed head to the EEPROM.

Table 3-7. This section describes the procedures for solving the problem

when an ink out (cartridge out) error is displayed even though a brand-new ink cartridge has been installed.

Step Check Point Remedy

Page 74

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 74

9 Have the cartridg es been

refilled?

Because this printer uses a new type of cartridge, traces of whether the cartridges have been refilled can basically be checked. The reasons are as follows.

1. In contrast to previous CSICs, there is no ventilation hole at the top of the cartridge. There is no refill point like previously.

2. If a syringe is inserted through the film to charge the inside of the cartridge with ink, a hole is made in the film, and so the customer must use measures such as applying tape in order to prevent ink from leaking out.

10 The data in the ink

cartridge CSIC chip (EEPROM) is corrupted.

Of the many items of data stored in the CSIC chips, the only item that is updated by the printer is the ink consumption counter. If 100% is written to this address, the cause will be one of the following two reasons.

1. Corrupt data in the CSIC chip. The cause of this might be as follows.

1.1.The data was recorded incorrectly when the CSIC chip was shipped from the factory (data is randomly corrupted).

1.2.The CSIC chip was shipped without being initialized for some reason.

1.3.The hand of the customer touched the chip while charged with static electricity, and this caused the data in the EEPROM to be randomized, so that the data became corrupted.

2. A head hot error as described in No. 7 occurred. In such cases, the data is not randomized as described above, but the only part of the CSIC data that is changed is the ink consumption counter. No data in any of the other addresses is affected.

NOTE:Previous printers which adopted the CSIC and

printers which used DC motors have a sequence which forcibly changed the consumption status to 100% for currently-installed ink cartridges as a result of customer error. However, this printer does not have such a function. Accordingly, CSIC problems relating to ink life should be analyzed based on the above points.

Table 3-7. This section describes the procedures for solving the problem

when an ink out (cartridge out) error is displayed even though a brand-new ink cartridge has been installed.

Step Check Point Remedy

Page 75

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 75

3.1.4.3 Countermeasures when an Ink Low indication appears.

This section describes the procedures for solving the problem when an Ink Low indication is displayed unexpectedly. However, ink low indications can occur naturally while printing is in progress. This section covers cases when the ink cartridges have just been replaced but the Ink Low indication does not disappear, using an actual case of a claim received by a subsidiary from a customer as an example.

3.1.4.4 Remedies for the Maintenance Error

If a maintenance error momentarily occurs, operation of the printer will not be possible. Because this is an error which occurs because the amount of ink discharged up until this time is close to the total absorption capacity of the ink pad, if operation continues past this point, there is the danger that the waste ink in the lower case may leak out. Because the adjustment program supports IEEE 1284.4, it includes a function for forcibly clearing this error. Accordingly, either a special panel operation at the printer or a reset operation using the adjustment software can be used to clear this maintenance error.

NOTE: Once the maintenance error has been cleared, the waste ink drain pad

must be replaced. If it is not replaced, ink may leak out while the customer is using the printer.

Table 3-8. Countermeasures when an Ink Low indication does not

disappear (Check conditions with customer)

Step Check Point Remedy

1 Does the printer fail to

recognize new ink cartridges immediately after the customer has installed new ink cartridges?

When ink cartridges are replaced, the printer recognizes the presence of brand-new ink cartridges by the following procedure.

Step1. The customer presses the replace button to

move the carriage to the replacement position.

Step2. The customer removes the cartridge which is

currently showing an Ink Low or Ink Out status. If a cartridge showing an Ink Out status is removed at this time, the Ink Out indication does not change. If a cartridge showing an Ink Low status is removed, the Ink Out status (actually Cartridge Out) is momentarily displayed.

Step3. A new ink cartridge is installed. At this time,

the following differences occur depending on the situation. [If the cartridge replaced showed an Ink Out indication] The Ink Out indication remains even when a brand-new ink cartridge is installed. [If the cartridge replaced showed an Ink Low indication] The Ink Low indication remains even when a brand-new ink cartridge is installed.

If the printer cannot recognized the new ink cartridge immediately after it is installed, it is because the printer is designed so that communication timing between the CSIC and the main unit is not carried out when the carriage is at the ink cartridge replacement position. If communication is carried out at the ink cartridge replacement position, removing and installing the cartridge would not write the data correctly, with the result that the data inside the EEPROM would be unreliable.

Table 3-9. Countermeasures when a maintenance error occurs

Step Actions Correct LED condition

1 While holding down both the Load/Eject

switch and the Ink Maintenance switch, turn on the power.

The Paper Out LED will flash for 5 seconds. Step 2 must be started during this time.

2 Press and hold the Ink Maintenance

switch for 10 seconds. When the printer accepts the maintenance error clearing function, all LEDs will momentarily light and the printer will then switch to standby mode.

Check that the two LEDs momentarily light and then turn off.

Page 76

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 76

NOTE: During the Step 2, if the Load/Eject button is pressed, the Maintenance

Error is not cleared but the EEPROM initialization mode is activated instead. The EEPROM initialization can be used to recover from conditions such as the printer does not accept any data from the PC. The EEPROM initialization mode initializes the following items:

 Accumulated power-off time: The value for the Timer IC is reset.

 Timer IC (Stylus COLOR C80 only):

The time during which the power is interrupted is continually counted until the energy of the capacitor located in the timer IC is dissipated. This timer IC is only equipped in the Stylus COLOR C80, so it does not apply to the Stylus COLOR C70. Moreover, the Stylus COLOR C70 has this power interrupt timer as part of the printer driver functions, and so the printer driver judges whether timer CL has been carried out and the level until the power is turned back on again.

 I/F selection: Selects “Auto”, the factory default, from 4 I/F

selection items: Auto, Parallel, Serial, and Option.

3.1.4.5 Remedies for Fatal Error

Fatal errors can occur with this printer for one of the following two reasons.



When the status of the signal from the sensor to the main board indicates that there is a problem with the carriage motor operation and status.

 When the status of the signal from the sensor to the main board indicates that

there is a problem with the paper feed motor operation and status.

A fatal error is basically caused by any of the following conditions:

1. The printer does not detect the carriage in the home position.

2. The printer does not detect signals from the linear scale.

3. The ASF sensor does not detect the ASF home position.

The following tables show various causes of the error and corresponding solutions. Be sure to follow the steps correctly to solve the problems.

NOTE 1: If the finding for the question is Yes, take the action described in

the right column. If “No”, proceed to the next step.

NOTE 2: Once the fatal error occurs, the adjustment program cannnot

communicate with the printer. Therefore, please eliminate a factor of the fatal error once, and then use the adjustment program if you want to need.

Page 77

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 77

Table 3-10. Countermeasures when a fatal error occurs

Step Check Point Remedy

1 Is the linear scale

not moving in between the photo sensor (photo coupler) parts on the underside of the carriage? (or is the area around the photo sensor clear of problems?)

NOTE:These countermeasures include ways to solve paper

loading problems when there is dirt or other foreign materials on the linear scale, but paper jams may also occur depending on the level of dirtiness, so processing as a carriage error (fatal error) may also be required.

If the linear scale does not move inside the photo sensor, a fatal error will occur. Check if the condition is as shown in the illustration below or not. If the linear scale is not inside the photo sensor, re-adjust the positions of the linear scale and photo sensor.

If the surface is dirty, remove the linear scale and clean it with a cloth moistened with alcohol.

CR Encoder

Liner Scale

Dust or Smeared Points

2Is the FFC

disconnected or almost disconnected from the junction board on the underside of the carriage?

3 Is the rotary scale

not moving in between the PF encoder (photo coupler) parts? (or is the area around the photo sensor clear of problems?)

If the rotary scale is not inside the photo sensor, the PF motor will operate at high speed and the mechanism may become overloaded, resulting in a fatal error. Check if the condition is as shown in the illustration below or not. If the rotary scale is not inside the photo sensor, re-adjust the rotary scale so that it is inside the photo sensor. Furthermore, check if the connector that transmits the signal from the rotary encoder to the main board is disconnected.

4Check if CN12

(white: 4-pin) on the main board is disconnected.

CN12 on the main board is a connector that transmits the feedback signal from the PF encoder to the main board. Accordingly, if this connector is disconnected, the result is the same as if there is a malfunction of the PF encoder.

Table 3-10. Countermeasures when a fatal error occurs

Step Check Point Remedy

Junction Board

CN 1

Rotary Scale

Photo Coupler

Check Point 1

Check Point 2

Page 78

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 78

5 Is CN8 (FFC) on

the main board disconnected or almost disconnected?

CN8 on the main board is a connector that transmits the feedback signal from the carriage encoder to the main board as well as transmitting the head drive signals. Accordingly, if this connector is disconnected, the result is the same as if there is a malfunction of the carriage encoder.

6 Is there a

malfunction of the CR motor?

Use an ohmmeter to check the resistance value of the coil inside the carriage motor. Resistance value: 23.3 ohms +/- 15% (DC)

NOTE:Look carefully at the whole of the coverings of the two

harnesses, and make sure that there are no holes anywhere in the coverings. If a hole is found anywhere, measure the internal coil res istance and replace just the harness if the resistance value is normal. (However, none of the harnesses for the spare parts motors are supplied as single parts.)

Table 3-10. Countermeasures when a fatal error occurs

Step Check Point Remedy

7 Is there a

malfunction of the PF motor?

Use an ohmmeter to check the resistance value of the coil inside the paper feed motor. Resistance value: 23.3 ohms +/- 15% (DC)

NOTE:Look carefully at the whole of the coverings of the two

harnesses, and make sure that there are no holes anywhere in the coverings. If a hole is found anywhere, measure the internal coil resistance and replace just the harness if the resistance value is normal. (However, none of the harnesses for the spare parts motors are supplied as single parts.)

8 Is there a

malfunction of the motor driver IC (IC8) on the main board?

If the pins of IC8 are blackened, the main board and the motor must both be replaced at the same time. Furthermore, in order to determine which motor, check the internal coil resistance of the motors as described in step 7 above, and replace whichever motor does not give a normal resistance value measurement (energization not possible, or abnormal current flow due to short). In addition, if there are no visible problems with the IC, replace the main board and then check the operation.

NOTE:When the main board is replaced, several adjustments

must be carried out, so refer to the "Adjustment" and "Disassembly" sections for details on carrying out these adjustments correctly.

9 Is there a

malfunction of the PF motor encoder (photo sensor)?

Replace the junction board that the encoder is mounted on, and check operation.

Table 3-10. Countermeasures when a fatal error occurs

Step Check Point Remedy

Page 79

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 79

3.1.5 Isolating the Faulty Part on the Power Supply Board

This section explains how to troubleshoot the following problems:

 The printer is turned on, but the initialization is not performed and LED on the

control panel do not come on.

Be sure to perform troubleshooting in the order specified, because the parts involved are mentioned in the disassembly procedure to facilitate servicing.

10 Is there a

malfunction of the CR motor encoder (photo sensor)?

Replace the junction board on the underside of the carriage that the encoder is mounted on, and check operation.

NOTE:Once the carriage or the carriage guide shaft have been

removed, several adjustments must be carried out, so refer to the "Adjustment" and "Disassembly" sections for details on carrying out these adjustments correctly.

Table 3-10. Countermeasures when a fatal error occurs

Step Check Point Remedy

W A R N I N G



Be careful to avoid electric shocks when checking the electrical circuit boards (C424 MAIN-B, PSE and B circuit boards) while the power is turned on.



Table 3-11. Isolating the Faulty Part

on the Power Supply Board

Step Check Point Remedy

1Is the power

supply stable?

When printers with a PSB board installed are used in countries where the power supply voltage is 200 V, the power supply board may become damaged. Furthermore, even if printers with a PSB board installed are used in countries where the power supply voltage is 100-120 V, the power supply board may not operate correctly if the power supply voltage is too low.

HT on IC51 HT on D51

HT on Q51

Page 80

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 80

2 Is CN19 (white

8-pin) on the main board loose or completely disconnected?

Check that CN19 is not loose or disconnected. If it is loose or disconnected, reconnect it securely to the main board.

NOTE:CN2 on the C424PSB/PSE board is soldered on so that it

is not likely to come loose or be disconnected. However, the soldered joint may become broken if the printer is dropped or subjected to unexpectedly strong shocks, and this may result in the connector becoming loose.

3 Is the fuse (F1)

on the C424PSB/ PSE board blown? (Visual check is possible.)

If overcurrent (due to lightning or other voltage abnormalities) occurs, the fuse (F1) on the power supply board will blow. This can be checked visually. If F1 is found to have blown, replace only F1 and then check the operation again. If F1 blows again, there is probably a problem with the power supply board, and so the board should be replaced. If F1 continues to blow even after the power supply board is replaced, carry out the following steps.

1. Check the internal coil resistances of the CR/PF motors.

2. Check that the print head FFC connections at the main board and the print head are normal. Furthermore, when checking the print head side, check that there are no burn residues on the head driver board.

3. If the check in No. 2 above indicates a problem at either end, replace the main board, the power supply board, the print head and whichever motor showed a problem. Furthermore, if no problems were found, there is probably a problem with the main board, and so the main board and power supply board should be replaced.

Table 3-11. Isolating the Faulty Part

on the Power Supply Board

Step Check Point Remedy

F 1

4 Are any of the

condenser breaker valves open (particularly C11 or C51)?

C11 and C51 are the most likely places for this to happen. If the breaker valves are open, replace the power supply board. However, if problems with operation continue to occur after the power supply board is replaced, carry out steps 1 to 3 in procedure No. 2 above.

Are any conductive foreign particles such as metal shavings in between the power supply board and the shield plate?

If insects get inside the printer, they can also cause problems with the power supply board. Also check if there are any foreign particles on the surface of the power supply board.

6 Is F51 on the +42

V termination line blown?

Check the continuity of F51. If it has blown, replace the power supply board.

Table 3-11. Isolating the Faulty Part

on the Power Supply Board

Step Check Point Remedy

C 51

C 11

F 51

Page 81

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 81

If the problem does not disappear or if it cannot be reproduced when these checks are carried out, refer to "CR Motor Operation Abnormal" in Section 3.1.6.11.

7 Is a normal

voltage being output from the power supply board?

Measurement points are shown below. <+42 V measurement>

• Positive tester probe: Pin 1, pin 2

• Negative tester probe: Either pin 3, pin 4 or pin 8

<+5 V measurement>

• Positive tester probe: Pin 6, pin 7

• Negative tester probe: Either pin 3, pin 4 or pin 8

Table 3-11. Isolating the Faulty Part

on the Power Supply Board

Step Check Point Remedy

6-pin

2-pin 1-pin

7-pin

42VDC: 1,2 pin 5VDC: 6,7 pin

8 Even though the

power supply board is supplying a normal voltage, is the 3.3 V DC power supply voltage that is used to control the main board normal?

Check whether the +5 V DC power supply voltage at IC9 on the main board is being supplied correctly or not, and whether the +3.3 V DC is being output normally from IC9.

Table 3-11. Isolating the Faulty Part

on the Power Supply Board

Step Check Point Remedy

Check Point 1

(for +3.3 VDC output

Check Point 2

(for +5 VDC input

Page 82

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 82

3.1.6 Isolating the Faulty Part according to the Phenomenon

Refer to this section if you could not solve the problem in Section 3.1.4 or Section

3.1.5 or need more information to isolate the cause according to the exhibited phenomenon. In models which use a DC motor, even if a problem occurs in the printer mechanism, the motor will keep operating if the current is within the rated level and no problem will be detected. The result of this is that the motor can keep operating without a fatal error being detected and without any mechanism problem being detected, so that a large amount of noise was produced. This section lists surface problems that occurred during inspections at the prototype stage and which might be considered to occur in the marketplace also.

Table 3-12. Troubleshooting for surface problems

Step Surface problem Reference page

1 [PF Motor Driver Abnormal 1]

PF motor rotary encoder feeds paper at high speed in an unexpected manner that is different from normal operation, or paper jams always occur around the hopper.

Refer to Section 3.1.6.1.

2 [ASF Driver Abnormal 1]

The PF motor operates normally, but the ASF is not being driven. (Paper is not being fed.)

Refer to Section 3.1.6.2.

3 [Unexpected Ink Out (Cartridge Out) Error]

Dot dropout appears to be happening a lot, and then suddenly an Ink Out indication appears. However, the ink cartridges are almost new or are still quite full.

Refer to Section 3.1.6.3.

4 [PF Motor Driver Abnormal 2]

Noise occurs around the PF motor each time the PF motor operates.

Refer to Section 3.1.6.4.

5 [Carriage Operation Abnormal]

When the power is turned on, the carriage appears to move slightly, but then a fatal error occurs. (The fatal error always occurs at the same place.)

Refer to Section 3.1.6.5.

6 [Dot Missing 1]

The carriage operates normally, but printing is not possible at all.

Refer to Section 3.1.6.6.

7 [Dot Missing 2]

Specific nozzles are always missing or give an alignment failure even though cleaning is carried out.

Refer to Section 3.1.6.7.

8 [Dot Missing 3]

All nozzles are firing, but printing is unstable.

Refer to Section 3.1.6.8.

11 [Repair Handling Failure]

The ROM is to be replaced with a new one, but immediately after the power is turned on a fatal error occurs.

Refer to Section 3.1.6.9.

12 [ASF Driver Abnormal 2]

The LD roller shaft inside the ASF rotates normally when the PF motor operates, but the paper cannot be fed properly, or a large amount of noise is heard.

Refer to Section 3.1.6.10.

13 [CR Motor Operation Abnormal]

A printer which has performed well up until a certain time suddenly changes in printing speed so that printing time becomes much longer.

Refer to Section 3.1.6.11.

Table 3-12. Troubleshooting for surface problems

Step Surface problem Reference page

Page 83

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 83

3.1.6.1 PF Motor Driver Abnormal 1

This section describes the procedures for solving the problem when no error occurs, but only the PF motor operates at high speed all the time even though this has not happened before. The PF motor is different from the carriage motor in that it does not generate a fatal error even if the rotary encoder cannot read at all, so that the firmware checks the bar code signal on the rotary encoder and continues providing current to the PF motor, causing it to operate at high speed. The methods of solving this problem are given below in order starting from the easiest, so refer to them for the checking and working procedures.

Table 3-13. PF Motor Driver Abnormal 1

Step Check Point Remedy

1 Is the rotary scale not

moving in between the PF encoder (photo coupler) parts? (or is there a problem around the photo sensor?)

If the rotary scale is not inside the photo sensor, a fatal error will occur. Check if the condition is as shown in the illustration below or not. If the rotary scale is not inside the photo sensor, re-adjust the rotary scale so that it is inside the photo sensor. Furthermore, check if the connector that transmits the signal from the rotary encoder to the main board is disconnected.

2 Check if CN12 (white: 4-

pin) on the main board is disconnected.

3 Is there a malfunction of

the photo coupler junction board?

Replace the junction board shown in the above photograph and then check the operation.

Rotary Scale

Photo Coupler

Check Point 1

Check Point 2

Page 84

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 84

3.1.6.2 ASF Driver Abnormal 1

This section describes the procedures for solving the problem when no error occurs, but the ASF is not driven at all even though the PF motor operates normally. This problem occurs because the ASF and the printer mechanism are not engaged correctly. The methods of solving this problem are given below in order starting from the easiest, so refer to them for the checking and working procedures.

Table 3-14. ASF Driver Abnormal 1

Step Check Point Remedy

1 Is the ASF installed

correctly to the printer mechanism?

Check all of the following points.

1. Is the ASF change lever protruding from the cut-away part at the front of the mechanism?

2. Are the two protrusions at the left side of the ASF left side frame correctly visible from the cut-away part of the mechanism? (If it is not protruding, it needs to be reset.)

Cutting Part

Carriage Motor

ASF Change Lever

CR Motor

Left Side of the

Printer Mechanism

Protrusion 1

Front View

PF Motor

Protrusion 2

Bottom View

(Cont.)

Is the ASF installed correctly to the printer mechanism?

3. The PF motor harness routed correctly? If the harness is routed incorrectly as shown in the illustration below, there will be a gap between the ASF and the printer mechanism, and the gears will not engage correctly. Furthermore, the PF motor harness may also develop an open circuit.

4. Are the two protrusions at the left side of the ASF left side frame correctly visible from the cut-away part of the mechanism?

Table 3-14. ASF Driver Abnormal 1

Step Check Point Remedy

Correct Harness Condition

Incorrect Harness Condition

Left Side of the

Printer Mech anism

Good

No Good

Protrusion 1

Front View

Bottom View

Protrusion 2

Right Side of the

Printer Mechanism

Page 85

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 85

3.1.6.3 Unexpected Ink Out Error 1 (During Print Operation)

This section describes the procedures for solving the problem when unexpected Ink Out errors occur. However, the problem described here is separate to the problem described before when an Ink Out error occurred even though the ink cartridges had just been replaced with new ones. This section covers Ink Out errors caused by head hot errors which can occur when printing continues while several of the nozzles are missing. The only way to solve this problem is to replace the ink cartridges, so this section mainly describes the process by which the error occurs.

Table 3-15. Unexpected Ink Out Error 1 (During Print Operation)

Explanation step Head hot error requirements, process and countermeasures

1 A new head hot sensor function has been added to the Stylus COLOR 900/

980. The background to this is given below.

1. Nozzles (number of internal PZTs) were added to cope with the increase in printing speed.

2. The print head drive frequency was increased.

Under the above conditions, the head becomes extremely hot when ink cannot be supplied to the head, and in the worst case the PZTs can seize in the same way as a vehicle engine.

2 The Stylus COLOR 900/980 does not have a CSIC, so removal and

reinstallation of prohibited ink cartridges caused the ink consumption counter to become inaccurate, so that even if there was not even a single drop of ink in a cartridge, the printer firmware would detect this incorrectly and would cause printing characters to be generated at the print head with the danger of the condition in No. 1 above occurring, and the result would be damage to the PZTs.

3 To prevent this from happening, the Stylus COLOR 900/980 detected the

temperature at each color nozzle, and if more than half of the nozzles in a nozzle line become blocked, and if printing is continuing, then the data for this rise in temperature caused by this abnormal condition was detected, causing the following sequence to occur.

1. Abnormal temperature is detected. (At this time the actual temperature inside the head is approximately 100°C.)

2. Printing of the current character data is momentarily stopped.

3. After this, cleaning (CL1) starts automatically.

4. Printing of the current character data resumes. If no abnormal temperature is detected after this and the power is then turned off, the history data indicating that an abnormal temperature was detected is cleared.

5. If printing is carried out again (before the power is turned off), and if a high temperature is detected again at this time, it is judged that the ink cartridges in the printer are completely empty and Ink End is set.

4 The Stylus COLOR C70/C80 have the same function written into their

firmware, but the following points are completely different to those for the Stylus COLOR 900/980. When an abnormal temperature is detected, an Ink Out condition is immediately set, and the ink consumption counters for the currentlyinstalled ink cartridges are set to 100%, so that the only way to reset the problem is to install new ink cartridges. The reasons for changing the sequence in this way are as follows.

1. Actual market results show that problems related to heat hot errors and customer confusion never occurred.

2. Points to note during head replacement were strictly observed by Epson subsidiaries and their partners, and so no repair problems ever occurred.

3. The Stylus COLOR 900/980 used conventional ink cartridges which were not of a CSIC type, so that the amount of ink actually remaining in ink cartridges and the amount of ink remaining as understood by the printer firmware was liable to cause counter mismatches due to incorrect operations carried out by customers, but with this product the cartridges can be installed and removed freely.

5 Accordingly, the occurrence of head hot errors is extremely rare in the new

models, and basically the only problem that can be expected is counter mismatches due to refilling.

Table 3-15. Unexpected Ink Out Error 1 (During Print Operation)

Explanation step Head hot error requirements, process and countermeasures

Page 86

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 86

3.1.6.4 PF Motor Driver Abnormal 2

Table 3-16. PF Motor Driver Abnormal 2

Step Check Point Remedy

1 Is the belt tension

appropriate (is it not too loose) even though the PF motor operates normally?

If the belt tension cannot be checked to see if it is normal just by touching it, reset the belt tension by the following procedure.

1. Remove the tension spring that is attached to the screw securing the PF motor.

2. Loosen the two screws that are securing the PF motor. (They do not need to be removed.)

3. Remove the timing belt from the pinion gear.

4. Set the timing belt onto the pinion gear.

5. Attach the tension spring to one of the screws securing the PF motor.

6. Tighten the screw which was attached to the spring in the step above.

7. Tighten the other screw.

Tension Spring

Timing Belt

PF Motor Pinion

2 Screws

2Are the ASF

transmission gear and the combination gears

18.4 and 32.4 at the ASF engaged correctly?

When the combination gear is gently turned clockwise and counterclockwise by hand, check that the ASF drive gear also moves. To check a whole revolution, set the ASF change lever to the active position and turn the timing belt or the PF motor pinion gear to check the operation.

Table 3-16. PF Motor Driver Abnormal 2

Step Check Point Remedy

ASF Drive Gear

Combination Ge ar

18.4, 32.4

Page 87

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 87

3.1.6.5 Carriage Operation Abnormal

This section describes the procedures for solving the problem when a fatal error occurs as soon as the power is turned on and the printer stops operating. The methods of solving this problem are given below in order starting from the easiest, so refer to them for the checking and working procedures.

Table 3-17. Carriage Operation Abnormal

Step Check Point Remedy

1 Has the left end of the

carriage guide shaft that is supported by the PG lever come away from the mechanism and fallen down?

The PG lever which can be operated by the customer is secured to the cut-away section of the printer mechanism. If the lever becomes separated from this point, the carriage guide shaft will also be separated from the mechanism so first check the hooks of the PG lever and make sure that they are securely fastened.

2 Is the right end of the

carriage guide shaft also attached correctly to the frame in the same way as above?

The photograph below shows the right end of the carriage guide shaft in its correct position. The end of the shaft that is protruding from the frame is secured by means of the notch in the PG adjust lever.

Carriage Guide Shaft

PG Lever Hooks

Right Frame

Top of the edge of CR Guide Shaft

PG Adjust Lever

3 Were any screws not

fastened when the circuit board was replaced? (Service problem)

The photograph shows a screw which is located in a place where it can obstruct movement of the carriage.

4Has PG adjustment

been carried out correctly? (Service problem)

While referring to "Chapter 5 Adjustment", carry out PG adjustment if any parts or units which require PG adjustment to be done have been replaced or removed.

Table 3-17. Carriage Operation Abnormal

Step Check Point Remedy

Screw

Page 88

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 88

5 Does the carria ge lock

lever operate normally?

If the carriage lock lever cannot be operated when it is still in the active position, the carriage cannot move in the printing area direction. When the power is turned on, check that the carriage lock lever is moved to the unlock position before the carriage starts moving.

[Cause 1] The carriage lock lever is not correctly protruding from the

notch in the EJ frame. [Cause 2] The EJ roller shaft is not correctly secured by bushing 5, or

the PF motor drive is not being transmitted correctly. [Cause 3] The pump unit is not secured correctly to the frame, and

when the gear load increases, the carriage lock lever cannot be operated. In this case, the EJ roller shaft also will not rotate.

Table 3-17. Carriage Operation Abnormal

Step Check Point Remedy

Carriage Lock Lever

(Lock Status)

Transmission Gear

for Pump Unit

Unlock Direction

Carriage Lock Lever

(Lock Status)

Transmission Gear

for Pump Unit

Unlock Direction

Pump Drive Gear

Page 89

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 89

3.1.6.6 Dot Missing 1

This section describes the procedures for solving the problem when the printer is printing, but no print actually appears on the paper. Because this covers situation when the nozzles are not firing correctly for even one dot to be printed, and so it is separate from cases where several dots are fired normally. In this case, you should refer to the next section (3.1.6.7). The following symptoms for which results can be expected from checking.

1. Only black ink is not firing at all.

2. Only colored inks (CMY) are not firing at all.

3. None of the colors are printing at all.

Table 3-18. Dot Missing 1

Step Check Point Remedy

1 Is either CN8 or CN9

connected at an angle or disconnected? (This is difficult to ascertain visually, so be sure to re-seat the FFCs.)

The illustrations below show connectors CN8 and CN9 which affect printing. Be sure to disconnect the AC cable and then re-seat it. When re-seating the cable, press the FFCs by hand to see if they can be pushed in any further. If they can, then the FFC connections to CN8 and CN9 are probably loose, even if they are not inserted at an angle. If this is the case, problems with printing will occur.

2 Is the fuse (F1) that is

located in the 42 V line that is supplied to the print head blown?

Use an ohmmeter to check the continuity of F1. If there is no continuity, replace the circuit board or the fuse.

3 Are the FFC connected

to the print head normal? Check the FFC by the procedure in step

Check the insertion of the two FFCs while referring to "Print Head" in Chapter 4. If there are traces of smoke on the junction board on the head, that print head cannot be reused. Furthermore, in such cases, the print head and the main circuit board should be replaced together in order to prevent the possibility of secondary damage.

Correct Condition

Incorrect Condition

F 1

Page 90

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 90

3.1.6.7 Dot Missing 2

This section describes the procedures for solving the problem when a specific nozzle is not firing (dots are missing). If none of the nozzles are firing and nothing is printing, refer to the previous section.

If a specific nozzle is not firing and the dots are missing, basically nozzle cleaning should be carried out, so that the cleaner blade can clean the surfaces of the nozzles and some ink can be drawn out of the ink cartridge. This is often an effective way to remedy the problem. Therefore the procedure below should be followed.

Table 3-19. Dot Missing 2

Step Check Point Remedy

1 Press the Ink

maintenance switch on the printer to start cleaning.

Check that the mis-firing nozzle(s) gradually return to normal. If they do appear to be returning to normal, repeat the cleaning process until they are fully clean. If they do not appear to be returning to normal, proceed to step 2.

Furthermore, the dummy cleaning operation that was used in older models is not supported by this model, so there is no problem with carrying out cleaning operations repeatedly.

2 Can the cap unit operate

normally?

Press the part shown below by hand and check that it moves and that the cap unit automatically returns.

Checking method if there is a problem with operation

1. Check that the two screws that are securing the cap unit to the right side of the mechanism are correctly securing the cap unit, and check that the positioning protrusion and the hole at the top of the cap unit are aligned.

2. Check that the hooks of the cap unit are correctly secured to the middle frame.

3. Check that the spring at the bottom of the cap unit is not detached. Also check that the drain ink tube is attached correctly to the bottom of the cap.

Check for No. 1

Table 3-19. Dot Missing 2

Step Check Point Remedy

Manually

Automatically

Protrusion

Screws

Page 91

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 91

(Cont.)

Can the cap unit operate normally?

Check for No. 2

Check for No. 3

Table 3-19. Dot Missing 2

Step Check Point Remedy

Hooks

Drain Ink Tube

Spring

3 Is there any dust or other

foreign matter on the cap? And is the cap free from damage and deformation?

If there is any dust or foreign matter on the edge of the cap as shown below, then the head and the cap will not seal together correctly and ink will not be suctioned correctly. If dust or other foreign matter is present, use a cotton swab or similar to clean it all off.

Furthermore, if the edge of the cap has been damaged in some way, it will interfere with suctioning of the ink, and air may be drawn into the head. If this has happened, replace the whole of the cap unit.

After carrying out all checks, carry out cleaning once more and check if the problem is solved.

4 Use the adjustment

program to carry out forced cleaning (CL3) and check if printing returns to normal.

Check that the mis-firing nozzle(s) gradually return to normal. If they do appear to be returning to normal, repeat the CL3 cleaning procedure using the adjustment program until the nozzles are all fully clean. If they do not appear to be returning to normal, proceed to step 5.

5 Use the adjustment

program to reset the initial ink charge flag to force cleaning using the initial ink charge.

Check that the mis-firing nozzle(s) gradually return to normal. If they do appear to be returning to normal, repeatedly reset the initial ink charge flag and turn the power on using the adjustment program until the nozzles are all fully clean. If they do not appear to be returning to normal, proceed to step 6.

Table 3-19. Dot Missing 2

Step Check Point Remedy

Dust or some

foreign substances

Damaged Area

Page 92

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 92

3.1.6.8 Dot Missing 3

This section describes the procedures for checking the following factors which can cause instability in printing even though all nozzles are firing ink normally. Carry out the steps in the order given.

1. Characters are not sharply defined.

2. Horizontal and vertical lines are not straight.

3. White stripes or colored stripes are easily visible after high-speed printing.

6 Let the printer stand for a

day (if time permits).

After leaving the printer for a day, (In worst case, 3 to 4 days are required.) check if the missing printing appears to be returning to normal. If it does appear to be returning to normal, use the cleaning function on the panel, and the CL3 cleaning function and initial ink charge flag reset function of the adjustment program and check the progress. If it does not appear to be returning to normal, proceed to step 7.

7 Replace the print head. —

Table 3-19. Dot Missing 2

Step Check Point Remedy

Table 3-20. Dot Missing 3

Step Check Point Remedy

1 Have any parts or units

relating to the carriage guide shaft been removed or replaced?

Carry out PG adjustment. Refer to Chapter 5 for details. If this does not apply, proceed to step 2.

2 Has a head ID been

recorded?

If no head ID has been input, the TG value combination will fortunately not result in a head hot error, but the voltages an frequency correction data that are appropriate for that head will not be stored on the main board, and so the control carried out will not match the head's performance and unstable printing may result. Refer to Chapter 5 for details.

3 Has the head ben

replaced?

If angle adjustment has not been carried out, it should be carried out. Refer to Chapter 5 for details. If the head has not been replaced, proceed to step 4.

4 Carry out Bi-D

adjustment.

Refer to Chapter 5 for details.

5 Carry out PF

adjustment.

Refer to Chapter 5 for details.

NOTE:PF adjustment is an effective adjustment function

for high-speed paper feeding. It is an adjustment function for when the high-speed settings for Economy mode printing when print quality is not a problem and for Normal mode printing are carried out using the printer driver. Accordingly, it is an adjustment that cannot be expected to have an effect on printing problems during high-quality printing.

6 Do the uneven parts of

characters only appear in a certain raster?

Because it is possible that the printer has received a severe shock in the case of a specified raster, check this with the customer. If the carriage encoder receives a severe shock and momentarily stops reading, it may cause a direct ink firing timing fault even if it does not result in a fatal error, and this can cause character distortion for a particular raster.

If the printer has not received a severe shock and printing can be carried out once more, the problem is not reproduced again.

Page 93

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 93

3.1.6.9 Repair Handling Failure

This section describes the procedures for checking when a fatal error occurs when the power is first turned on after the main board has been replaced. There is one cause for this.

NOTE: The unexpected ink out error which can occur when there is a mismatch

between the print head ID and the TG value in the EEPROM on the main board does not occur when the main board is replaced with a spare part board. This is because the default value recorded in the main board is "SHARP", and so the combination of the main board being "EPSON" and the head being "SHARP" which would otherwise cause an error does not occur.

3.1.6.10 ASF Driver Abnormal 2

This section describes the ASF operation problems mentioned before in more depth. The ASF problems that were mentioned previously dealt mainly with problems with the structural parts on the right side of the ASF, but this section covers the procedures for checking the causes of problems around the clutch mechanism. Most problems that occur around the clutch mechanism involve noise. Follow the procedures below to carry out the necessary checks.

Table 3-21. Repair Handling Failure

Step Check Point Remedy

1 Has the main board for

the Stylus COLOR C80 or C70 been installed by mistake because the boards have the same name?

The EEPROMs on each board contain the model name data. When the power is turned on, the model name data that is stored in the ROM and the EEPROM data are compared and checked, and if the model name is incorrect, the printer develops a fatal error.

Table 3-22. ASF Abnormal 2

Step Check Point Remedy

1Does noise

occur in the ASF just as the paper is being fed? Does noise occur during hopper reset when the ASF is driven in the reverse direction to paper feeding?

[Abnormal noise during paper feeding]

If the noise occurs at the point where the ASF starts operating in the paper feed direction, carry out the checks in step 16 to step 19 of Section 3.1.4.1 or 3.1.6.2.

[Abnormal noise during hopper reset (reverse drive)]

1. Check that the change lever for driving the ASF is correctly installed to the shaft of the ASF. To check this, refer to the illustrations below. If the end of the shaft is visible at point A, then it is set correctly. If the end of the shaft is not visible at point B, the ASF change lever has come loose from the shaft, and it should be pushed back on again. Also check that the torsion spring is not loose or disconnected.

Explanation: If the ASF change lever comes loose, the stopper function

for the clutch will not work at all, so the LD roller shaft will keep turning but paper will not be fed when required.

Correct Condition

Incorrect Condition

Torsion Spring

ASF Change Lever

Page 94

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 94

(Cont.)

Does noise occur in the ASF just as the paper is being fed? Does noise occur during hopper reset when the ASF is driven in the reverse direction to paper feeding?

2. When the ASF is driven in the reverse direction to paper feeding (during hopper reset and back feeding), check that the planetary gear always lifts up.

[Analysis points]

A.The photograph shows the planetary gear lowered, and the lever of

the planetary gear set is obstructing the ASF change lever, so that the planetary gear cannot move from this position regardless of whether the motor is running in forward or reverse.

B.However, when the carriage contacts the ASF change lever, the lever

of the planetary gear set is released, so that the planetary gear is lifted up (yellow arrow).

C.At this time, the LD roller shaft is double driven by gear 1 and by

gear 2 which is hidden behind gear 1.

D.In this case, the gear that drives gear 1 is the planetary gear, and the

gear that drives gear 2 is the transmission gear.

When paper is being fed and when the power is turned on and off, double feeding of the ASF is always carried out. Furthermore, the angle of the above photograph is a view from the right side of the printer with the ASF mechanism removed, to allow the mechanism to be checked easily. If the planetary gear is not lifted up, the probable cause is one of the following.

[Cause 1]

The tension of the spring that applies a load inside the planetary gear is too strong and the planetary gear cannot lift up.

[Cause 2]

The friction of the shafts that pass through the planetary gear set is to strong and the planetary gear cannot lift up.

[Cause 3]

The ASF change lever is not installed correctly, so that even when the carriage contacts the change lever, it does not move and so the clutch remains engaged.

Table 3-22. ASF Abnormal 2

Step Check Point Remedy

Planetary Gear

Gear 1

Gear 2

Drive Gear

Transmission Gear

Planetary Gear Set

2Does the PF

motor operate without the LD roller inside the ASF unit rotating regardless of the ASF control operations?

[Check for disconnected clutch (tension) spring] While referring to the photograph below, check that the tension spring

is attached correctly to the clutch gear inside the ASF unit. To check, turn off the power and turn the timing belt that is attached to the pinion gear of the PF motor. At this time, you must move the ASF change lever manually so that it is in the same position as if the carriage is pressing against it. This check can be carried out by looking into the left side of the ASF unit from the right side of the printer with just the upper case removed.

[Explanation]

For the check in step 1 above, if the ASF lever is at the normal position, the LD roller will always rotate when the PF motor operates regardless of whether ASF control is in progress or not, even if the clutch tension spring is disengaged. In other words, the operation is the same as if the carriage is always pushing against the ASF change lever.

Table 3-22. ASF Abnormal 2

Step Check Point Remedy

Tension Spring

Clutch

Inner Gear

Outer Gear

Page 95

EPSON Stylus COLOR C70/C80 Revision A

Troubleshooting Overview 95

3.1.6.11 CR Motor Operation Abnormal

This section describes the procedures for checking printers that have been returned because the printing speed suddenly became much slower after having operated normally up until then. This problem basically cannot be immediately reproduced when carrying out repairs. This description concentrates on why problem occurs. To remedy the problem, canceling the transmission of printing data or turning off the power, wait about 15 minutes and then start printing again. Printing should then return to normal speed. This resetting method should be taught to the customer.

Table 3-23. CR Motor Operation Abnormal

Step Check Point Remedy

1 Is no problem apparent

when printing is carried out?

If a problem is found, refer to the appropriate section of surface problems and take the appropriate measures. If no problem is found, continue to the next step.

2 Check the customer's

usage environment.

When DC motors are continually used, they become hot, and if they become too hot it can cause the coil inside the motor to seize. To prevent this from happening, the Stylus COLOR C70/C80 carries out the following controls.

1. If continuous printing is carried out for 150 pages and printing continues past this, the carriage drive speed does not change but a 3-second waiting time is introduced after each pass is completed. This always occurs when the carriage moves from left to right or from right to left.

2. In addition to the above condition, the same operation is performed if printing has been carried out continuously for 35 minutes, even if the number of continuous pages printed does not reach 150.

NOTE:This operation causes the printing speed to remain at

the slow speed without returning to normal as long as the current print job continues. If the speed does not automatically return to normal, it is different from the SIDM Print Head protection operation.

3 To return the printing speed to normal from the above,

momentarily pause the transmission of printing data from the computer, or turn the printer's power off and wait 15 minutes. The speed will then return to normal.

4 Make sure that the customer understands the above conditions,

and show them the relevant sections of the User's Guide so that they understand how the printer's protection operation works.

Page 96

CHAPTER

DISASSEMBLY AND ASSEMBLY

Page 97

EPSON Stylus COLOR C70/C80 Revision A

Disassembly and Assembly Overview 97

4.1 Overview

This section describes procedures for disassembling the main components of the product. Unless otherwise specified, disassembly units or components can be reassembled by reversing the disassembly procedure. Things, if not strictly observed, that could result in injury or loss of life are described under the heading “Warning”. Precautions for any disassembly or assembly procedures are described under the heading “CAUTION”. Chips for disassembling procedures are described under the heading “CHECK POINT”. If the assembling procedure is different from the reversed procedure of the disassembling, the procedure is described under the heading “REASSEMBLY”. Any adjustments required after disassembling the units are described under the heading “ADJUSTMENT REQUIRED”. When you have to remove any units or parts that are not described in this chapter, refer to the exploded diagrams in the appendix.

Read precautions described in the next section before starting.

4.1.1 Precautions

See the precautions given under the handling “WARNING” and “CAUTION” in the following column when disassembling or assembling the product.

W A R N I N G



Disconnect the power cable before disassembling or assembling the printer.



If you need to work on the printer with power applied, strictly follow the instructions in this manual.



Wear protective goggles to protect your eyes from ink. If ink gets in your eye, flush the eye with fresh water and see a doctor immediately.



Always wear gloves for disassembly and reassembly to avoid iujury from sharp metal edges.



To protect sensitive microprocessors and circuitry, use static discharge equipment, such as anti-static wrist straps, when accessing internal components.



Never touch the ink or wasted ink with bare hands. If ink comes into contact with your skin, wash it off with soap and water immediately. If irritation occurs, contact a physician.

W A R N I N G



Avant de commencer, assurez vous que l’imprimante soit eteinte et que le cordon d’alimentation soit debranche.



Veillez a jeter les piles usagees selon le reglement local.

Page 98

EPSON Stylus COLOR C70/C80 Revision A

Disassembly and Assembly Overview 98

4.1.2 Tools

Use only specified tools to avoid damaging the printer.

C A U T I O N



Never remove the ink cartridge from the carriage unless this manual specifies to do so.



When transporting the printer after installing the ink cartridge, be sure to pack the printer for transportation without removing the ink cartridge.



Use only recommended tools for disassembling, assembling or adjusting the printer.



Observe the specified torque when tightening screws.



Apply lubricants and adhesives as specified. (See Chapter 6 for details.)



Make the specified adjustments when you disassemble the printer. (See Chapter 5 for details.)



When assembling, if an ink cartridge is removed and needs to be installed again, be sure to install a new ink cartridge because of the following reasons;

1. Once the ink cartridge mounted on the printer is removed, air comes in and creates bubbles in the cartridge. These bubbles clog ink path and cause printing malfunction.

2. If an ink cartridge in use is removed and is reinstalled, ink quantity will not be detected correctly since the counter to check ink consumption is cleared.



Because of the reasons above, make sure to return the printer to the user with a new ink cartridge installed.



Make sure the tip of the waste ink tube is located at correct position when reassembling the waste ink tube. Otherwise it will cause ink leakage.

Table 4-1. Special Tool List

Name Supplier Parts No.

Phillips Screw Driver (No.1) EPSON B743800100

Phillips Screw Driver (No.2) EPSON B743800200

Tweezers EPSON B741000100

Page 99

EPSON Stylus COLOR C70/C80 Revision A

Disassembly and Assembly Overview 99

4.1.3 Work Completion Check

If any service is made to the printer, use the checklist shown below to confirm all works are completed properly and the printer is ready to be returned to the user.

Table 4-2. Work Completion Check

Classifi-

cation

Item Check Point Status

Main Unit

Self-test Is the operation normal?



Checked



Not necessary

On-line Test Is the printing successful?



Checked



Not necessary

Printhead

Is ink discharged normally from all the nozzles?



Checked



Not necessary

Carriage Mechanism

Does it move smoothly?



Checked



Not necessary

Is there any abnormal noise during its operation?



Checked



Not necessary

Is there any dirt or foreign objects on the CR Guide Shaft?



Checked



Not necessary

Is the CR Motor at the correct temperature? (Not too heated?)



Checked



Not necessary

Paper Feeding Mechanism

Is paper advanced smoothly?

• No paper jamming?

• No paper skew?

• No multiple feeding?

• No abnormal noise?



Checked



Not necessary

Is the PF Motor at correct temperature?



Checked



Not necessary

Is the paper path free of any obstructions?



Checked



Not necessary

Adjustment

Specified Adjustment

Are all the adjustment done correctly?



Checked



Not necessary

Lubrication

Specified Lubrication

Are all the lubrication made at the specified points?



Checked



Not necessary

Is the amount of lubrication correct?



Checked



Not necessary

Function ROM Version Version:



Checked



Not necessary

Packing

Ink Cartridge

Are the ink cartridges installed correctly?



Checked



Not necessary

Protective Materials

Have all relevant protective materials been attached to the printer?



Checked



Not necessary

Others

Attachments, Accessories

Have all the relevant items been included in the package?



Checked



Not necessary

Table 4-2. Work Completion Check (continued)

Classifi-

cation

Item Check Point Status

Page 100

EPSON Stylus COLOR C70/C80 Revision A

Disassembly and Assembly Overview 100

4.1.4 Screws

The screws used in the printer are as shown in Table 4-3. Make sure you always use the correct type and number of screws for the assembling part. See Table 4-4 for the screw appearances.

Table 4-3. Screw Specifications

Abbreviation Description

C.B.P Cross-recessed Binding Head P-tite screw

C.B.S Cross-recessed Binding Head S-tite screw

C.P Cross-recessed Pan Head screw

C.B.(0) Cross-recessed Binding Head sems B-type screw

C.C Cross-recessed Cup Head screw

Table 4-4. List of Screw Types

No. Specifications Appearance No. Specifications Appearance

1 (No.1) C.B.P,

M3x10

2 (No.2) C.B.S,

M3x6

3 (No.3) C.B.P,

M4x12

4 (No.4) C.B.S,

M3x8

5(No.5) C.P,

M3x14

6 (No.6) C.B.(0),

M4x5

7 (No.7) C.B.P,

M3x6

8 (No.8) C.C,

M3x4

9(No.9)

P.F Mount

10 (No.10) C.P,

M3x4

11 (No.11) C.B.P

M2.5x5