Epson Stylus Photo 720, Stylus Photo EX3 Service Manual

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SERVICE MANUAL

SERVICE MANUAL

SERVICE MANUALSERVICE MANUAL

EPSONStylusPhoto72

Color Inkjet Printer

EPSON STYLUS PHOTO 720 / STYLUS PHOTO EX3

EPSONStylusPhotoEX



SEIJ00001

PRECAUTIONS

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

DANGER

WARNING

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

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

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

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.

WARNING

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

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

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

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

5. REPLACE MALFUNCTIONING COMPONENTS ONLY WITH THOSE COMPONENTS BY THE MANUFACTURE; INTRODUCTION OF
SECOND-SOURCE ICs OR OTHER NONAPPROVED COMPONENTS MAY DAMAGE THE PRODUCT AND VOID ANY APPLICABLE
EPSON WARRANTY.

About This Manual

This manual describes basic functions, theory of electrical and
mechanical operations, maintenance and repair procedures of EPSON
Stylus Photo 720 / Stylus Photo EX3. 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.

Contents

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

Provides the step-by-step procedures for the

troubleshooting.

CHAPTER 4.DISASSEMBLY AND ASSEMBLY

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

CHAPTER 5.ADJUSTMENTS

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.

APPENDIXProvides the following additional information for

reference:

• Connector pin assignments

• Electric circuit boards components layout

• Exploded diagram

• Electrical circuit boards schematics

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 WARNING, CAUTION or NOTE
messages.

W ARNING

CAUTION

CHECK

POIN T

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

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.

Revision Status

Revision Issued Date Description

Rev. A April 6, 2000 First Release

EPSON Stylus Photo 720 / EPSON Stylus Photo EX

3

A

6

Revision

Contents

Product Description

Overview ....................................................................................................... 9

Features ................................................................................................... 9

Basic Specification .................................................................................... 10

Printing Specification .............................................................................. 10

Paper Feed specification ........................................................................ 11

Input Data Buffer .................................................................................... 11

Electric Specification .............................................................................. 11

Environmental Conditions ...................................................................... 12

Reliability ................................................................................................ 12

Safety Approvals .................................................................................... 12

Acoustic Noise ........................................................................................ 12

CE Marking ............................................................................................. 12

Interface Specification .............................................................................. 13

IEEE-1284 Parallel I/F (Forward Channel) ............................................. 13

IEEE-1284 Parallel I/F (Reverse Channel) ............................................. 13

USB (Universal Serious Bus) ................................................................. 16

Miscellanea ............................................................................................ 16

Preventing Hosts from Data Transfer Time-out .................................. 16

Interface Selection .............................................................................. 16

IEEE 1284.4 protocol ......................................................................... 17

Control Specification ................................................................................ 18

Control Panel .......................................................................................... 18

Control Switches .................................................................................... 18

Code Page Selection/ Parallel I/F IEEE1284.4 Setting ...................... 19

Special Setting Mode ......................................................................... 20

LED Indications ...................................................................................... 20

Initialization ............................................................................................. 21

Errors ...................................................................................................... 21

Paper ........................................................................................................... 22

Paper handling ....................................................................................... 22

Paper Specification ................................................................................ 22

Printable Area ........................................................................................ 24

Ink Cartridge ........................................................................................... 26

Physical Specification .............................................................................. 27

Consumables and Options ....................................................................... 28

Operating Principles

Overview .................................................................................................... 30

Printer Mechanism ................................................................................. 30

Printhead ................................................................................................ 32

Printing Process ................................................................................. 33

Printing Method .................................................................................. 34

Carriage Mechanism .............................................................................. 35

Platen Gap (PG) Adjustment Mechanism .......................................... 35

Paper Feeding Mechanism .................................................................... 36

Paper Loading Mechanism (ASF Unit) ................................................... 37

Ink System Mechanism .......................................................................... 39

Pump Unit and CR Lock Mechanism ................................................. 39

Capping Mechanism .............................................................................. 40

Ink Sequence ......................................................................................... 41

Electrical Circuit Operating Principles .................................................... 42

C301PSB/PSE Board ............................................................................. 42

C301MAIN Board ................................................................................... 44

Main elements .................................................................................... 45

Printhead Driver Circuit ...................................................................... 45

PF Motor (PF/ PUMP/ ASF Motor) Driver Circuit ............................... 47

CR Motor Driver Circuit ...................................................................... 48

Reset Circuit ....................................................................................... 48

EEPROM Control Circuit .................................................................... 49

Sensor Circuit ..................................................................................... 50

EPSON Stylus Photo 720 / EPSON Stylus Photo EX

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Revision

Troubleshooting

Overview ..................................................................................................... 52

Unit Level Troubleshooting ...................................................................... 54

Printer does not operate at power on ..................................................... 54

Error is detected ..................................................................................... 55

Failure occurs during printing ................................................................. 55

Printer does not feed paper correctly ..................................................... 56

Control panel operation is abnormal ...................................................... 56

Unit Repair (Power Supply Board) ........................................................... 57

Unit Repair (Control Board) ...................................................................... 58

Unit Repair (Printer Mechanism) .............................................................. 60

Disassembly and Assembly

Overview ..................................................................................................... 65

Precautions ............................................................................................ 65

Tools ....................................................................................................... 65

Work Completion Check ......................................................................... 66

Disassembly ............................................................................................... 67

Housing Removal ................................................................................... 68

Circuit Board Assembly Removal ........................................................... 69

Control Panel Removal .......................................................................... 71

Ink Absorber Tray Assembly (Waste Ink Pad) Removal ........................ 72

Printer Mechanism Disassembly ............................................................ 73

Printhead Removal ............................................................................. 73

Pump Assembly / Cap Assembly Removal ........................................ 75

CR Motor Assembly Removal ............................................................ 77

PF Motor Assembly Removal ............................................................. 78

ASF Assembly Removal ..................................................................... 80

ASF LD Roller Assembly Removal ..................................................... 82

LD Roller Assembly Disassembly ....................................................... 87

CR Assembly Removal ...................................................................... 88

PE Sensor Assembly Removal .......................................................... 90

PF Roller Assembly Removal ............................................................. 91

CR HP Sensor Removal ..................................................................... 93

Adjustment

Overview .................................................................................................... 95

Required Adjustment .............................................................................. 95

Adjustment ................................................................................................. 96

PG Adjustment ....................................................................................... 96

Adjustment by Adjustment Program ....................................................... 98

Adjustment Program .............................................................................. 98

Adjustment Program Installation Procedure ........................................... 98

Adjustment Program Initial Setting Screen ............................................ 99

Market Destination Check .................................................................... 100

Head Voltage ID Input .......................................................................... 101

Head Angular Adjustment .................................................................... 103

Bi-Directional Adjustment ..................................................................... 106

USB ID Check/Input ............................................................................. 109

Head Cleaning ..................................................................................... 110

Initial Ink Charge .................................................................................. 111

Protection Counter Check/Clear .......................................................... 111

Print A4 Pattern .................................................................................... 113

Maintenance

Overview .................................................................................................. 115

Cleaning ............................................................................................... 115

Service Maintenance ............................................................................ 116

Lubrication ............................................................................................ 117

Appendix

Connector Summary ............................................................................... 122

Major Component Unit ......................................................................... 122

EEPROM Address Map ....................................................................... 125

Component Layout .................................................................................. 129

Exploded Diagram ................................................................................... 131

Parts List .................................................................................................. 139

Electric Circuit ......................................................................................... 149

PRODUCT DESCRIPTION

CHAPTER

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1.1 Overview

Stylus Photo 720 and Stylus Photo EX3 is developed from Stylus Photo 700 and Stylus
Photo EX and allows a high resolution photographic high quality print enabled by
variable dot.

1.1.1 Features

Major features of this printer are as follows;

o

High color print quality

n

1440x720 (HxV) dpi printing

n

Photo-MACH technology (6 color printing. CMYKLmLc)

n

Traditional and New Microweave

o

Built-inASF(AutoSheetFeeder)

n

Holds 100 cut-sheets (64 g/m2)

n

Holds 10 envelopes

n

Holds 30 transparency films

o

Built-in 2 I/F

n

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

n

USB (Universal Serial Bus)

Stylus Photo 720

Stylus Photo EX3

o

Windows / Macintosh exclusive

Figure 1-1. External View

Product Descri

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1.2 Basic Specification

1.2.1 Printing Specification

PRINTING METHOD

o

On demand ink jet

NOZZLE CONFIGURATION

o

Black: 32 nozzle

o

Color: 32 nozzle x 5 colors

(Cyan, Magenta, Yellow, Light Cyan, Light Magenta)

Light

Cyan

#32

Black

Cyan

Magenta

Light

Magenta

Yellow

PRINTING SPEED AND PRINTABLE COLUMNS

o

Character mode: Refer to the table below.

Table 1-1. Printing Speed (Character Mode)

Character Pitch Printable Columns LQ speed

Stylus Photo 720 10 CPI (Pica) 80 200 CPS**

Stylus Photo EX3 10 CPI (Pica) 114 200 CPS**

NOTE: These figures are not described in the user’s guide.

** This value is the speed of normal-dot printing.

o

Raster graphics mode: Refer to the table below.

Table 1-2. Printing Speed (Raster Graphics Mode)

Stylus Photo 720

Horizontal
Resolution

180 dpi 8.26 inch 1488 508mm/s (20 IPS)

360 dpi 8.26 inch 2976 508mm/s (20 IPS)

720 dpi 8.26 inch 5952 508mm/s (20 IPS)

180 dpi 11.46 inch 2062 508mm/s (20 IPS)

Printable

Area

Available

Dot

CR Speed

Stylus Photo EX3

4 / 360"

#1

360 dpi 11.46 inch 4125 508mm/s (20 IPS)

720 dpi 11.46 inch 8250 508mm/s (20 IPS)

CONTROL CODE

o

ESC/P Raster command

nozzle

o

EPSON Remote command

Figure 1-2. Nozzle Configuration (Seen from the Back of the Head)

PRINTING DIRECTION

o

Bi-direction with logic seeking

Product Descri

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CHARACTER TABLES

o

2 international character sets

n

PC437 (US, Standard Europe)

n

PC850 (Multilingual)

TYPEFACE

o

Bitmap LQ font

n

EPSON Courier 10 CPI

1.2.2 Paper Feed specification

o

Feeding Method: Friction feed with ASF

o

Paper path: Cut-sheet ASF (Top entry Front out)

o

Feed speed: 10.16mm feed: 110ms

Continuous feed: 114.3mm/s

1.2.3 Input Data Buffer

o

Buffer: 256 Kbytes

1.2.4 Electric Specification

o

120V version

n

Rated voltage: AC 100V

n

Input voltage range: AC 99 -132V

n

Rated frequency range: 50 - 60Hz

n

Input frequency range: 49.5-60.5 Hz

n

Rated current: 0.4A (Max. TBD)

n

Power consumption: Approx.18W (ISO10561 Letter pattern)

n

Insulation Resistance: 10 M ohms min.

n

Dielectric: AC 1000 V rms. 1 minute or

o

220-240V version

n

Rated voltage: AC 220 - 240V

n

Input voltage range: AC 198 - 264V

n

Rated frequency range: 50 - 60Hz

Approx. 2.5W in standby mode
Energy Star compliant

(between AC line and chassis, DC 500V)

AC 1200 V rms. 1 second
(between AC line and chassis)

n

Input frequency range: 49.5-60.5 Hz

n

Rated current: 0.2A (Max. TBD)

n

Power consumption: Approx.18W (ISO10561 Letter pattern)

Approx. 2.5W in standby mode
Energy Star compliant

n

Insulation Resistance: 10 M ohms min.

(between AC line and chassis, DC 500V)

n

Dielectric: AC 1500 V rms. 1 minute

(between AC line and chassis)

Product Descri

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1.2.5 Environmental Conditions

o

Temperature
Operating: 10 to 35
Non-operating: -20 to 40°C

1monthat40°C, 120 hours at 60°C

o

Humidity
Operating: 20 to 80% RH
Non-operating: 5 to 85% RH

o

Resistance to shock
Operating: 1G, within 1ms
Non-operating: 2G, within 2ms

o

Resistance to vibration
Operating: 0.15G
Non-operating: 0.50G

NOTE: *1: with shipment container.

*2: without condensation.
*3: The environmental condition should be within the range shown in the
figure below.

(%)

80

*3

°C

*1

*2,*3

*1,*2

*1

*1

1.2.6 Reliability

o

Total print volume: 10,000 pages (A4, Letter)

o

Print Head Life: 3 billion dots / nozzle

Or 5 years at the normal temperature
(Whichever comes first.)

1.2.7 Safety Approvals

o

120V version:

n

Safety Standards: UL1950

CSA22.2 No.950

n

EMI: FCC part15 subpart B class B

CSA C108.8 class B

o

220 - 240V version:

n

Safety Standards: EN 60950 (VDE)

n

EMI: EN 55022 (CISPR Pub. 22) class B

AS/NZS 3548 class B

1.2.8 Acoustic Noise

o

Level: Approx. 47dB (A) (According to ISO7779)

1.2.9 CE Marking

220-240V version

55

20

10 27 35

(”C)

tmphumid

Figure 1-3. Environmental Condition

Product Descri

tion Basic Specification 12

o

Low Voltage Directive 73/23/EEC: EN60950

o

EMC Directive 89/336/EEC: EN55022 class B

EN61000-3-2
EN61000-3-3
EN50082-1

IEC801-2
IEC801-3
IEC801-4

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1.3 Interface Specification

This printer has IEEE-1284 parallel interface and USB interface as standard.

1.3.1 IEEE-1284 Parallel I/F (Forward Channel)

Forward channel is the mode to transfer the ordinary printing command to the printer
side from the PC side.

Table 1-3. Parallel I/F Specification (F-Channel)

Item Specification

Transmission mode 8bit parallel

Synchronization By STROBE pulse supplied from the external

Handshaking By BUSY and ACKNLG signal

Signal Level TTL level (IEEE-1284-Level 1 device)

Adaptable connector 36 pin 57-30360 (amphenol) or equivalent

NOTE: I/F cable is recommended to be in minimum length.

The connector pin assignment is described below. For these signals described in the
table, use the twist pair wire and connect the return side to the signal GND.

Table 1-4. Connector Pin Assignment and Signals (F-Channel)

Pin No.

1 19 -STROBE PC

2-9 20-27 Data0-7 PC

10 28 -ACKNLG Printer

Return

GND Pin

Signal

Name

From Function Description

The strobe pulse for the printer to read data.
Pulse width requires min. 0.5µs (500ns).
High at normal condition. Receives data after
shifting Low.

The DATA 1 through DATA8 signals
represent data bits 1-8, respectively.

A low signal indicates the printer can accept
data. Pulse width is 0.5 (default) or can be set
at 2µs.

Table 1-4. Connector Pin Assignment and Signals (F-Channel)

Pin No.

11 29 BUSY Printer

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

13 28 SLCT Printer

14 30 -AFXT PC Not used.

31 30 -INIT PC

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

36 30 -SLIN - Not used.

18 - Logic H -

35 - +5V -

17 - Chassis - Printer chassis GND.

16, 33

19-30

15, 34 - NC - Not used.

Return

GND Pin

- GND - Twist pair return GND.

Signal

Name

From Function Description

A high signal indicates that the printer cannot
receive data. The signal becomes high under
the condition below;

-Receiving data.

-Error.

-Other I/F receiving data.

Always at high level. Pulled up to +5V via

1.0KΩ resistor.

The printer is initialized by the width of min.
50µs Low pulse input.

Always at high level. Pulled up to +5V via

3.9KΩ resistor.

Always at high level. Pulled up to +5V via

1.0KΩ resistor.

1.3.2 IEEE-1284 Parallel I/F (Reverse Channel)

Reverse channel is used to transfer the information data from the printer side to the PC
side.

Product Descri

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Table 1-5. Parallel I/F Specification (R-Channel)

Item Specification

Transmission mode IEEE-1284 nibble mode

Synchronization Comply with the IEEE-1284 specification

Handshaking Comply with the IEEE-1284 specification

Logic Level TTL level (IEEE-1284-Level 1 device)

Data trans. timing Comply with the IEEE-1284 specification

Extensibility request data The printer responds affirmatively when the extensibility request

values are 00H or 04H;
00H: Request Nibble Mode Reverse Channel Transfer.
04H: Request Device ID;
Return Data Using Nibble Mode Reverse Channel Transfer

Device ID

n

When IEEE-1284.4 protocol is effective:
[00H] [5AH]
MFG: EPSON;
CMD: ESCPL2, BDC, D4;
MDL: Stylus[SP]Photo[SP]720;

*1

CLS: PRINTER;
DES: EPSON[SP]Stylus[SP]Photo[SP]720;

n

When IEEE1284.4 protocol is NOT effective:

*1

[00H] [57H]
MFG: EPSON;
CMD: ESCPL2, BDC;
MDL: Stylus[SP]Photo[SP]720;

*1

CLS: PRINTER;
DES: EPSON[SP]Stylus[SP]Photo[SP]720;

*1

Note: *1 For Stylus Photo EX3, MDL: Stylus[SP]Photo[SP]EX3;
DES: EPSON[SP]Stylus[SP]Photo[SP]EX3, respectively.

The connector pin assignment is described in the table below. For these signals
described in the table, use the twist pair wire and connect the return side to the signal
GND.

Table 1-6. Connector Pin Assignment and Signals (F-Channel)

Pin No.

1 19 HostClk PC Host clock signal.

2-9 20-27 Data1-8 PC

10 28 PtrClk Printer Printer clock signal.

11 29

12 28

13 28

Product Descri

tion Interface Specification 14

Return

GND Pin

Signal Name From Function Description

The DATA 1 through DATA8 signals
represent data bits 1-8 respectively.

PtrBusy/

DataBit-3,7

AckDataReq/

DataBit-2,6

Xflag/DataBit-

1,5

Printer

Printer

Printer

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

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

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

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Table 1-6. Connector Pin Assignment and Signals (F-Channel)

Pin No.

14 30 HostBusy PC Host busy signal.

31 30 -INIT PC Not used.

32 29

36 30 1284-Active PC 1284 active signal.

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

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

17 - Chassis - Printer chassis GND.

16, 33

19-30

15, 34 - NC - Not used.

Following lists “Notes” when using the parallel interface.

o

“Return GND pin” in the table means twist pair return and is connected to the
signal GND level.
For each signal, use the twist pair wire and connect the return side.
Also, these cables are shielded wires and it is effective means to connect to each
chassis GND in the center machine and printer for electrostatic noise.

Return

GND Pin

Signal Name From Function Description

-DataAvail/
DataBit-0,4

Printer

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

- GND - Twist pair return GND.

DATA

/STROBE

BUSY

/ACKNLG

Data byte n Data byte n+1

t

hold

t

t

setup

ready

t

stb

t

busy

t

reply

Figure 1-4. Timing Chart

On the above timing chart, T

Parallel I/F Mode T

High speed (default) 0.5

Normal speed 2 µs

ratedperiodisshownbelow.

act

Table 1-7. t

act

t

ack

Rated Period

Rated Period

act

µs

t

nbusy

t

next

timechart

o

Conditions for interface are all based on TTL level. Rise and fall time should be
within 0.2

o

Refer to the timing chart for transmission timing of each signals.

o

Do not perform data transmission ignoring -ACK or BUSY signals. (Perform the

µs.

data transmission after confirming that either -ACK or BUSY signal is Low)

o

It is possible to perform the printing test including interface circuit without using
external equipment when 8-bit data signal (2-9 pin) is set to appropriate character
code (against GND, Open=”1”, Short=”0”) and connect then forcefully to -ACK
and -STRB. However, to perform this, “I/F selection” of EEPROM must be set to
“Auto”. Also, IEEE-1284.4 packet mode must be set Off.

The figure below shows the timing chart of the parallel interface.

Product Descri

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1.3.3 USB (Universal Serious Bus)

Following shows specification.

o

Standard:

n

Universal Serial Bus Specifications Revision 1.0

n

Universal Serial Bus Device Class Definition for Printing Devices version 1.1

o

Bit rate: 12Mbyte (Full Speed Device)

o

Data encoding: NRZI

o

Adaptable connector: USB Series B

o

Recommended cable length: max. 2 meters

Table 1-8. Connector Pin Assignment and Signals

Pin.

No

1VCC --

2 -Data I/O Data

3 +Data I/O Data. Pull up to +3.3V via 1.5K ohm resistor.

4 Ground -- Cable ground.

Signal Name I/Out Function Description

Cable power. Maximum power consumption
is 2mA.

1.3.4 Miscellanea

1.3.4.1 Preventing Hosts from Data Transfer Time-out

Generally, hosts abandon data transfer to peripherals when a peripheral is in busy state
for dozens of seconds continuously. To prevent hosts from acting this kind of time-out,
when the open space of input buffer becomes 1024 byte, the printer receives data per
certain period of time (1 second) and avoid BUSY state continues for a long time. The
printer will be in busy state continuously when the input buffer finally gets full. This
operation is not performed while communicating by IEEE1284.4 protocol.

1.3.4.2 Interface Selection

IEEE-1284 parallel interface and USB interface is switched by auto select function.
The following explains the conditional shift of the I/F auto select function and the
operations when specific interface is set.

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 in the busy state, the selected interface is let as
is.

Pin #1Pin #2

Pin #3 Pin #4

usb

INTERFACE STATE AND INTERFACE SELECTION

o

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

Figure 1-5. USB Interface Port

Product Descri

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1.3.4.3 IEEE 1284.4 protocol

The packet protocol described by IEEE1284.4 standard always 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.

o

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

o

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

o

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

For parallel I/F, regardless of the factory default setting, after initial ink charge
operation, the setting of the EEPROM must be set to “AUTO”. The change in this
setting will be effective when the power is back on after the initial ink charge
operation.

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1.4 Control Specification

1.4.1 Control Panel

The control panel is at the front right of the printer and has 2 non-lock type push
switches and 1 lock type switch and 4 LEDs. The appearance of the control panel
differs between Stylus Photo 720 and Stylus Photo EX3, but the number of buttons and
LEDs is the same. So, this section explains names of the buttons using the Stylus Photo
720 control panel.

Power LED

Ink Maintenance Button

Paper Check LED

Black Ink End LED

Color Ink End LED

Power Button

Load/ Eject Button

Table 1-9. Panel Functions in Normal State

Button Function

Load/Eject

(Less than 2 seconds)

Load/ Eject

(for 3 seconds)

Ink maintenance

(for 3 seconds)

Ink maintenance

(Less than 2 seconds)

Load or eject paper

When the print head is at the ink replacement position, it returns to
the home position.

Start the ink cartridge replacement sequence.

Start cleaning the print head.

In the condition of “Ink Low”, “Ink End” or “No Ink Cartridge”,
start the ink cartridge replacement sequence.

When the print head is at the ink replacement position, it returns to
the home position.

Figure 1-6. Control Panel

1.4.2 Control Switches

Since this printer does not have so many switches, each button has several functions.
The tables below show their functions and how to enter those functions for each button.

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Table 1-10. Panel Function with Turning the Power On

Button Function

Load/Eject Start status-printing.*

Print “Firmware version”→ “CPU Mask version”→ “Waste
ink counter”→ “Code page setting”→ “Nozzle check pattern”.

Ink maintenance Code page.selection/ Parallel I/F IEEE 1284.4 setting (See

Section 1.4.2.1)

Load/Eject

+

Ink maintenance

Start special setting mode.
(See Table 1-13)

1

*Note

NOTE: Turning the power on = to turn on the printer power while specified

button is pressed down.

*1: Printer performs the following according to the value of 1BH in EEPROM.

Table 1-11. EEPROM 1BH Data and Function W

Bit 7, Bit 6 Action

00

11

01 Start hex-dump printing.

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

1.4.2.1 Code Page Selection/ Parallel I/F IEEE1284.4 Setting

On this setting mode, you can select code page table (PC437 or PC850) and parallel I/F
IEEE1284.4 mode (ON, AUTO, OFF).

o

Code Page Selection

You can select the code table PC437 or PC850 by the following panel operation.

1. Turn on the power while pressing the maintenance button.

2. Paper check LED starts blinking.

3. When you see the paper check LED starts blinking, release maintenance button.

4. After 2 seconds, the code page setting will be indicated by maintenance LED. See the
table below.

Table 1-12. Code Page Setting

Code page before this

function is performed.

PC437 PC850 Ink END (Color) ON

PC850 PC437 Ink END (Black) ON

NOTE: You can check current code page by status print.

Code page after this

function is performed.

LED Indication

10 Start self-test printing.

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1.4.2.2 Special Setting Mode

You can go to the special setting mode by the following operations.

1. Turn on the power while pressing the Load/ Eject button and ink maintenance button.

2. Paper check LED starts blinking. (3 seconds)

3. While the paper check LED is blinking (3 seconds), press the appropriate button. See
Table 1-13.

n

When maintenance error (protection counter over flow) is
happened, if you clear the error by this operation, be sure to
replace the waste ink absorber.

n

Whenever you replaced the waste ink counter (even when ink
maintenance error has not occurred), be sure to perform the
counter reset by this operation.

Table 1-13. Special Settings Mode

Buttons Function

Load/Eject Initialize EEPROM and reset timer IC.

This operation will reset the following items:

• Interface selection (04H)

• CL time (68/ 69H)

• Power OFF time (6C/ 6DH)

Reset the ink overflow counter.

Cleaning

(Pressed for 10 seconds)

NOTE: Hold the button pressed for 10 seconds.

This operation will reset the following items:

• Ink counter A0 (5C/ 5DH)

• Ink counter A80 (5E/ 5FH)

1.4.3 LED Indications

See the table below for more detailed LED indications. Since LED indicates the
various errors and current printer operations, LED indications enable to find out the
proper repair operation.

Table 1-14. Printer Status displayed on the control panel

Indicators

Printer Status

Power on condition On --

Ink sequence Blink -- -- -- 6

Ink cartridge exchange mode Blink -- -- -- 5

Data processing Blink -- -- -- 8

Paper check

Paper jam

No ink cartridge or Ink end
(black)

No ink cartridge or Ink end
(color)

Ink level low (black) -- -- Blink -- 7

Ink level low (color) -- -- -- Blink 7

EEPROM and Timer IC reset

Maintenance Request Blink Blink Blink Blink 2

Fatal Error

*1

*1

*1

*1

*2

*1

Power

-- On -- -- 4

-- Blink Off Off 3

-- -- On -- 7

-- -- -- On 7

--

Blink Blink On On 1

Paper

Check

*3

On

(for 1

second)

Ink End

(Black)

-- -- 9

On

(for 1

second)

Ink end

(Color)

On

(for 1

second)

Priority

--

NOTE: *1 For error condition, refer to “Fatal Error” under the “Errors” on

page 21.
*2 EEPROM clear does not mean to clear all address in

EEPROM. (See “Special Settings Mode” on page 20)

*3 -- in the table above means no change.

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1.4.4 Initialization

The printer have 3 types of initialization. The initialization operations executed by each
initialization method are described below.

o

Hardware Initialization
This printer initializes itself when it is turned on.
On this initialization, following actions are performed.

n

Initialize printer mechanism

n

Clear the input data buffer

n

Clear the print buffer

n

Set default values

o

Software initialization
Initialization command, “ESC@” also initializes the printer.
On this initialization, following actions are performed.

n

Clear the print buffer

n

Set default values

o

Panel initialization
This printer initializes itself when it is turned off and is turned on again within 10
seconds, or when it recognizes the -INIT signal input.

On this initialization, following actions are performed.

1.4.5 Errors

o

Ink Out
When the printer almost runs out the ink of any one 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 ink-cartridge
in this state. A ink-cartridge once taken out should never used again. Re­installation of the cartridge not filled fully upsets the ink level detection and may
cause a serious problem in the print head as a result.

o

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

o

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

o

No ink-cartridge
When the printer detects that the ink-cartridge comes off, it goes no ink-cartridge
error.

o

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

o

Fatal errors
Carriage control error or CG access error.

n

Cap the print head (Mechanism initialization is not performed.)

n

Eject paper

n

Clear the input buffer

n

Clear the print buffer

n

Set default values

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1.5 Paper

1.5.1 Paper handling

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

Envelope

n

Size:
No.10 (241.3 mm x 104.8 mm)
DL (220 mm x 110 mm)
C6 (162 mm x 114 mm)

n

Thickness: 0.16mm to 0.52mm(0.006 to 0.02”)

1.5.2 Paper Specification

STYLUS PHOTO 720

o

Cut Sheet

n

Paper Size:
A4 (210 x 297 mm)
Letter (216 x 279 mm)
B5 (182 x 257 mm)
Legal (216 x 356 mm)
Statement (139.7 x 215.9 mm)
Executive (184.2 x 266.7 mm)
A5 (148 x 210 mm)
A6 (105 x 148 mm)

n

Thickness: 0.08mm to 0.11mm(0.003 to 0.004”)

n

Weight: 64g/m2to 90g/m2(17lb to 24lb)

n

Paper quality: Exclusive paper, Bond paper, PPC

o

Transparency, Glossy paper

n

Size:
A4 (210 x 297 mm)
Letter (216 x 279 mm)

n

Weight: 45g/m2to 75g/m2(12lbto20lb)

n

Paper quality: Bond paper, Plain paper, Air mail

*Envelope printing is only available at normal temperature.

*Keep the longer side of the envelope horizontally at setting.

o

Index Card

n

Size:
A6(105x148mm)
A5(148x210mm)
5x8” index card (127 x 203 mm)
10x8” index card (254 x 203mm)

n

Thickness: 0.23 mm(0.0091”)

n

Thickness: 0.075mm to 0.085mm(0.003 to 0.0033”)

*Transparency printing is only available at normal temperature.

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STYLUS PHOTO EX3

Additional following items to the Stylus Photo 720 specification;

o

Cut Sheet

n

Paper size:
A3 (297 x 420 mm)
Letter (216 x 279 mm)
B5 (182 x 257 mm)
Legal (216 x 356 mm)
Statement (139.7 x 215.9 mm)
Executive (184.2 x 266.7 mm)
A5 (148 x 210 mm)
A6 (105 x 148 mm)

n

Thickness: 0.08mm to 0.11mm(0.003 to 0.004”)

n

Weight: 64g/m2to 90g/m2(17lb to 24lb)

n

Paper quality: Exclusive paper, Bond paper, PPC

o

Transparency, Glossy paper

n

Size:
A3 (297 x 420 mm)
A4 (210 x 297 mm)
Letter (216 x 279 mm)

o

Paper quality: Bond paper, Plain paper, Air mail

*Envelope printing is only available at normal temperature.

*Keep the longer side of the envelope horizontally at setting.

Index Card

n

Size:
A6(105x148mm)
A5(148x210mm)
5x8” index card (127 x 203 mm)
10x8” index card (254 x 203mm)

n

Thickness: 0.23 mm(0.0091”)

n

Thickness: 0.075mm to 0.085mm(0.003 to 0.0033”)

*Transparency printing is only available at normal temperature.

o

Envelope

n

Size:
No.10 (241.3 mm x 104.8 mm)
DL (220 mm x 110 mm)
C6 (162 mm x 114 mm)

n

Thickness: 0.16mm to 0.52mm(0.006 to 0.02”)

n

Weight: 45g/m2to 75g/m2(12lb to 20lb)

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1.5.3 Printable Area

o

Cut Sheet

LM RM

PW

Printable AreaPrintable Area

TM

PL

Table 1-15. Character Mode

Paper Size

A4 3mm (0.12”) 3mm (0.12”) 3mm (0.12”) 14 mm (0.54”)

Letter 3mm (0.12”) 9mm (0.35”) 3mm (0.12”) 14 mm (0.54”)

B5 3mm (0.12”) 3mm (0.12”) 3mm (0.12”) 14 mm (0.54”)

Legal 3mm (0.12”) 9mm (0.35”) 3mm (0.12”) 14 mm (0.54”)

Statement 3mm (0.12”) 3mm (0.12”) 3mm (0.12”) 14 mm (0.54”)

Exclusive 3mm (0.12”) 3mm (0.12”) 3mm (0.12”) 14 mm (0.54”)

LM (Left

Margin) min.

RM (Right

Margin) min.

TM (Top

Margin) min.

BM (Bottom

Margin) min.

Table 1-16. Raster Graphics Mode

Paper Size

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

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

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

LM (Left

Margin) min.

RM (Right

Margin) min.

TM (Top

Margin) min.

BM (Bottom

Margin) min.

14 mm (0.54”) /

3mm (0.12”)*

14 mm (0.54”) /

3mm (0.12”)*

14 mm (0.54”) /

3mm (0.12”)*

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

BM

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

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

14 mm (0.54”) /

3mm (0.12”)*

14 mm (0.54”) /

3mm (0.12”)*

14 mm (0.54”) /

3mm (0.12”)*

Figure 1-7. Cut Sheet Printable Area

NOTE: * Bottom margin can be set up to 3mm at minimum when the paper length

is designated with “ESC(S” command.) However, the printing quality is
not guaranteed in the area ranging from 3mm to 14mm, from the form
lower end. When the paper length is not designated, the bottom margin
must be wider than 14 mm.

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Envelope

LM

RM

TM

Printable AreaPrintable Area

BM

Figure 1-8. Printable Area for Envelopes

Table 1-17. Envelope Margin

Left Margin

Size

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

(minimum)

Right Margin

(minimum)

Top Margin

(minimum)

Bottom Margin

(minimum)

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”)

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1.5.4 Ink Cartridge

INK CARTRIDGE (BLACK)

o

Type: Exclusive cartridge

o

Color: Black

o

Print capacity: 540 pages / A4 (ISO/IEC10561 Letter pattern at 360 dpi)

o

Ink life: 2 years from production date

o

Storage temperature:

n

-20°Cto40°C
Storage, within a month at 40

n

-30°Cto40°C
Packing storage, within a month at 40

n

-30°Cto60°C
Transit, within a month at 60

o

Dimension: 19.8mm (W) x 52.7 mm (D) x 38.5mm (H)

°

C

°

C

°

C

COLOR INK CARTRIDGE

o

Type: Exclusive cartridge

o

Color: Magenta, Cyan, Yellow

o

Print capacity: 300 pages/A4 (360 dpi, 5% duty each color)

o

Ink life: 2 years from production date

o

Storage temperature:

n

-20°Cto40°C
Storage, within a month at 40

n

-30°Cto40°C
Packing storage, within a month at 40

n

-30°Cto60°C
Transit, within a month at 60

o

Dimension: 42.9mm (W) x 52.7 mm (D) x 38.5mm (H)

°

C

°

C

°

C

Figure 1-10. Color Ink Cartridge

NOTE: Ink cartridges cannot be refilled, properly dispose of after use. Do not

Figure 1-9. Black Ink Cartridge

Product Descri

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use the ink cartridge which is beyond its production date plus two years.
Ink will be frozen under -4
placing it more than 3 hours at room temperature.

°

C environment, however it will be usable after

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1.6 Physical Specification

o

Dimensions

n

Stylus Photo 720: 429 x 268 x 168 mm (WxDxH)

n

Stylus Photo EX3: 546 x 275 x 172 mm (WxDxH)

760.73

406

307.66

545.53

Figure 1-12. Stylus Photo EX3 Dimensions

o

Weight

n

Stylus Photo 720: approximately

Figure 1-11. Stylus Photo 720 Dimensions

Product Descri

tion Physical Specification

n

Stylus Photo EX3: approximately 7.0kg

5.2kg

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1.7 Consumables and Options

The consumables for this printer are following;

Table 1-18. Consumables

Classification No. Name

Consumables

S020187 Ink Cartridge (black)

S020193 Ink Cartridge (color)

Product Descri

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OPERATING PRINCIPLES

CHAPTER

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2.1 Overview

This section describes the operating principles of the printer mechanism and electrical
circuit boards. The Stylus Photo 720 / Stylus Photo EX3 has the following boards:

o

Main board: C301MAIN

o

Power supply board: C301PSB/PSE

o

Panel board: C209PNL Board (Stylus Photo 720)

C366PNL Board (Stylus Photo EX3)

2.1.1 Printer Mechanism

Stylus Photo 720 / Stylus Photo EX3 is based on Stylus Photo 700 / Stylus Photo EX
and the basic specifications for its mechanism are almost same as Stylus Photo 700 /
Stylus Photo EX.

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 Photo 720 / Stylus Photo EX3 is
equipped with two stepping motors; one for ASF/ paper feeding/ pump mechanism,
and one for CR mechanism. ASF unit uses rear entry front eject system; this design is
the same as Stylus Photo 750 / Stylus Photo 1200.

The table below shows the compatibility of the mechanical units among Stylus Photo
700, Stylus Photo 750 and Stylus Photo 720.

Table 2-1. Mechanical Unit Compatibility

Stylus Photo 700 /

Stylus Photo EX

Printhead E-Chips U-Chips E-Chips +

CR motor

(coil resistance)

PF moto

(coil resistance)

ASF unit --- Quiet noise type Quiet noise type

Paper feeding

mechanism

Pump unit Type A Type B Type A

Capping unit Valve A Valve B Valveless

Frame parts Stylus Photo 700 type Stylus Photo 750 type Stylus Photo 750 type

Main board C233MAIN C259MAIN C301MAIN

PSB/PSE board C206PSB C257PSB C301PSB/PSE

7.8Ω 7.8Ω 7.8Ω

7.8Ω 8.8Ω 8.8Ω

Bottom edge: 14mm

Stylus Photo 750 /
Stylus Photo 1200

Bottom edge: 3mm

enabled

Stylus Photo 720 /

Stylus Photo EX3

Bottom edge: 3mm

enabled

For cap assembly, Stylus Photo 720 / Stylus Photo EX3 uses valveless mechanism;
new design for this model.

Figure 2-1 on page 31 shows the outline of the printer mechanism.

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Paper Loading
Mechanism

CR Unit

CR Mechanism
(Printhead)

CR Motor

PF Motor

Paper Feed
Trigger Lever
Position

Paper Feeding
Mechanism

Figure 2-1. Printer Mechanism Block Diagram

Capping Position

Ink System

Cap
Mechanism

CR Lock Mechanism

Pump
Mechanism

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