Epson C20SX, C20UX, C40SX, C40UX Service Manual

®

SERVICE MANUAL

Color Inkjet Printer

Stylus C40UX/C40SX/C20UX/C20SX

SEIJ01002

Notice

 All rights reserved. No p art of t his manual may be reprod uced, stored i n a ret rieval sy stem, or t ransmit ted in any form or by a ny means el ectroni c,

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 witho ut notice.
 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.

Copyright © 2001 SEIKO EPSON CORPORA TION.
Imaging & Information Product Division
TPCS Quality Assurance Department

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.

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 fo r 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.

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

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

Indicates an operating or maintenan ce pr ocedure, practi ce,
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 necessar y to accomplish a task
efficiently. It may also provid e additional information that is
related to a specific subject, or comment on the results
achieved through a previous action.

I.ndicates 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.

Revision Status

Revision Issued Date Description

A May 31. 2001 First Release

Chapter 2

• Page 38 : Ink consumption of Initial charge was revised.
Chapter 4

• Page 58 : Warning message was deleted.

• Page 61 : Caution message regarding disassembly and assembly was added.

B July 10. 2001

• Page 63 : Adjustment Requested message for Top Margin adjustment was added.

• Page 65 : Reassembly message for inserting PS cable was revised.

• Page 68~70 : Disassembly procedure for Paper Guide Upper/Left was added.

• Page 76 : Adjustment Requested message for Top Margin adjustment was added.
Chapter 5

• Page 88,89 : Adjustme nt procedure for Top Margin was revised.

CONTENTS

Chapter 1 PRODUCT DESCRIPTION

1.1 FEATURES ......................................................................................................... 9

1.2 Differences between the Stylus C20 and the Stylus C40 ................................. 9

1.3 SECIFICATIONS ............................................................................................. 10

1.3.1 Physical Specification ................................................................................ 10

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

1.3.3 Paper Feeding ............................................................................................ 11

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

1.3.5 Electrical specification ............................................................................... 11

1.3.6 Envirormental Condition ........................................................................... 12

1.3.7 Reliability .................................................................................................. 12

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

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

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

1.4 INTERFACE ..................................................................................................... 13

1.4.1 USB Interface ............................................................................................ 13

1.4.2 Parallel Interface (Forward Channel) ........................................................ 13

1.4.3 Parallel Interface (Reverse Channel) ......................................................... 15

1.4.4 Prevention Hosts from Data Transfer Time-out ........................................ 16

1.4.5 IEEE1284.4 Protocol ................................................................................. 17

1.5 OPERATOR CONTROLS .............................................................................. 18

1.5.1 Operate Switch ........................................................................................... 18

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

1.5.3 Panel Functions .......................................................................................... 18

1.5.4 Printer Condition and Panel Status ............................................................ 18

1.5.5 Printer Initialization ................................................................................... 19

1.5.6 Errors ......................................................................................................... 19

1.6 PAPER ............................................................................................................... 20

1.6.1 Paper Handling .......................................................................................... 20

1.6.2 Paper Specification .................................................................................... 20

1.6.3 Printing Area .............................................................................................. 21

1.7 INK CARTRIDGE ........................................................................................... 23

1.7.1 Black Ink Cartridge ................................................................................... 23

1.7.2 Color Ink Cartridge .................................................................................... 23

Chapter 2 Operating Principles

2.1 Overview ............................................................................................................ 25

2.1.1 Printer Mechanism ..................................................................................... 25

2.1.2 Printhead .................................................................................................... 26

2.1.2.1 Printing Process ................................................................................. 27

2.1.2.2 Printing Method ................................................................................. 27

2.1.3 Carriage Mechanism .................................................................................. 28

2.1.4 Paper Feeding Mechanism ......................................................................... 30

2.1.5 Paper Loading Mechanism (ASF Unit) ..................................................... 31

2.1.6 Ink System Mechanism ............................................................................. 35

2.1.6.1 Pump Unit & Wiper mechanism ....................................................... 35

2.1.6.2 Capping Mechanism .......................................................................... 36

2.1.7 Ink Sequence .............................................................................................. 38

2.1.8 Printing mode ............................................................................................ 40

2.2 Electrical Circuit Operating Principles .......................................................... 41

2.2.1 C417 PSB/PSE board ................................................................................ 41

2.2.2 C413 MAIN/B Board ................................................................................ 43

2.2.2.1 Main elements ................................................................................... 43

Chapter 3 Troubleshooting

3.1 Overview ............................................................................................................ 45

3.2 Troubleshooting with LED Error Indications ............................................... 46

Chapter 4 Disassembly and Assembly

4.1 Overview ............................................................................................................ 57

4.1.1 Precautions ................................................................................................. 57

4.1.2 Tools .......................................................................................................... 59

4.1.3 Screws ........................................................................................................ 59

4.1.4 Work Completion Check ........................................................................... 60

4.2 Disassembly ....................................................................................................... 61

4.2.1 Upper housing removal .............................................................................. 61

4.2.2 ASF unit removal ....................................................................................... 63

4.2.3 Waste ink pad removal .............................................................................. 64

4.2.4 PS unit removal .......................................................................................... 65

4.2.5 Paper eject roller removal .......................................................................... 66

4.2.6 Paper Guide Upper/Left removal ............................................................... 68

4.2.7 MAIN board removal ................................................................................ 71

4.2.8 CR motor removal ..................................................................................... 73

4.2.9 Printhead unit removal ............................................................................... 74

4.2.10 LD unit removal ....................................................................................... 76

4.2.11 Printer mechanism removal ..................................................................... 77

Chapter 5 Adjustment

5.1 Overview ............................................................................................................ 79

5.1.1 Required Adjustment ................................................................................. 79

5.1.2 Adjustment Program Initial Setting menu ................................................. 80

5.1.3 Adjustment Program feature ...................................................................... 81

5.1.4 EEPROM initial setting ............................................................................. 83

5.1.5 Head ID ...................................................................................................... 83

5.1.6 Bi-D ........................................................................................................... 85

5.1.7 USB ID ...................................................................................................... 86

5.1.8 Top margin ................................................................................................. 88

5.1.9 Head cleaning ............................................................................................ 89

5.1.10 Initial ink charge ...................................................................................... 90

5.1.11 Refurbishment for DOA .......................................................................... 90

5.1.12 Protection counter check .......................................................................... 92

5.1.13 EEPRON check ....................................................................................... 94

5.1.14 EEPROM back up data ............................................................................ 95

5.1.15 A4 pattern will print ................................................................................. 96

6.1.3 Lubrication ............................................................................................... 100

Chapter 7 Appendix

7.1 Connector Summary ...................................................................................... 104

7.1.1 Major Component Unit ............................................................................ 104

7.2 EEPROM Address Map ................................................................................ 106

7.3 Component Layout ......................................................................................... 110

7.4 Parts List ......................................................................................................... 112

7.5 Exploded Diagram .......................................................................................... 113

7.6 Electrical Circuits ........................................................................................... 119

Chapter 6 Maintenance

6.1 Overview ............................................................................................................ 99

6.1.1 Cleaning ..................................................................................................... 99

6.1.2 Service Maintenance ................................................................................ 100

PRODUCT DESCRIPTION

CHAPTER

1

Stylus C40UX/C40SX/C20UX/C20SX Revision B

1.1 FEATURES



High color print quality

- 1440 (H) x 720 (V) dpi printing

- 4 color printing (YMCK)

- Traditional and New Microweave



Built-in auto sheet feeder

- Holds 100 cut-sheets (65 g/m²)

- Holds 10 envelopes

- Holds 10 transparency films



Built-in 1 I/F

Interface specification for each model are as the following.
Parallel Interface .EPSON Stylus C40SX .EPSON Stylus C20SX
USB Interface .EPSON Stylus C40UX .EPSON Stylus C20UX



Windows / Macintosh exclusive

1.2 Differences between the Stylus C20 and the Stylus C40

The Stylus C20 and Stylus C40 are mechanically the same, but the throughput of the
Stylus C40 is slightly higher than that of the Stylus C20. (Refer to Table 1-1.)

Table 1-1. Throughput

Models memo economy Normal

Stylus C20 6.5 PPM 3.0 PPM
Stylus C40 8.0 PPM 3.5 PPM

In both models, demarcation is determined by the EEPROM value 29 <H>. When the
value of bit 0 is 1, a wait of 40

msec is inserted for each CR pass during printing, then the next operation starts.

Table 1-2. Delay of oparation

EEPROM 29 <H> bit 0 v alue Model Delay time during printing

0Stylus C40None
1 Stylus C20 CR 40 msec for each pass.

PRODUCT DESCRIPTION FEATURES 9

Stylus C40UX/C40SX/C20UX/C20SX Revision B

1.3 SECIFICATIONS

This section covers specifications of the printer.

1.3.1 Physical Specification



Weight : 2.48kg (without the ink cartridges)



Dimensio n : 424 mm(W) x 227 mm (D) x 168 mm (H) (Printing)

1.3.2 Printing Specification



Print method : On demand ink jet



Nozzle Configuration : monochrome 48 nozzles

: color 15 nozzles x 3 (Cyan, Magenta, Yellow)



Print direction : Bi-direction with logic seeking



Print speed & Printable columns
Character mode : Black only

Character Pitch Character Quality Printable Columns CR Speed

10CPI LQ 80 Columns 20IPS

Raster graphics mode

Horizontal

resolution

480 dpi 8.26 inch 3968 14.1 IPS Black mode
360 dpi 8.26 inch 2976 23.8 IPS ­720 dpi 8.26 inch 5952 20 IPS -

1440 dpi 8.26 inch 11904 20 IPS -

Printable area Available dot CR Speed Notes



Control code* : ESC/P R4C7050 exclusive

: EPSON Remote command



Character tables* : none

ASCII 20h to 7Fh code support.

Figure 1-1. Stylus C40/C20 Dimensions



Typeface*

Bit map LQ font :EPSON Courier 10 CPI
International character sets * : None

* Do not mention to the user’s manual about control code, character tabl e, typeface and
International character sets.

PRODUCT DESCRIPTION SECIFICATIONS 10

Stylus C40UX/C40SX/C20UX/C20SX Revision B

1.3.3 Paper Feeding



Feeding method : Friction feed with ASF



Paper path : Cut-sheet ASF (Top entry)



Feed speed :

Feed condition Time Speed

10.16mm(0.4 inch) feed 110msec 92.36mm (3.64inch)/sec
Continuous feed 140msec 139.7mm (5.5inch) /sec

1.3.4 Input Data Buffer



Buffer size :12 Kbytes

1.3.5 Electrical specification



120 V version

Rated voltage : AC 120 V
Input voltage range : AC 99 - 132 V
Rated frequency range : 50 - 60 Hz
Input frequency range : 49.5 - 60.5 Hz
Rated current : 0.4A
Power consumption : Approx. 16W (ISO/IEC 10561 Letter pattern

: Approx. 4W in standby mode
: Energy Star compliant

Insulation Resistance :10 M ohms min.

(between AC line and chassis, DC 500 V)

Dielectric strength : AC 1000 V rms. 1 minute or

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



220-240 V version

Rated voltage : AC 220 - 240 V
Input voltage range : AC 198 - 264 V
Rated frequency range : 50 - 60 Hz
Input frequency range : 49.5 - 60.5 Hz
Rated current : 0.2A
Power consumption : Approx. 16W (ISO/IEC 10561 Letter pattern

: Approx. 4W in standby mode
: Energy Star compliant

Insulation Resistance :10 M ohms min.

(between AC line and chassis, DC 500 V)

Dielectric strength : AC 1500 V rms. 1 minute

(between AC line and chassis)

PRODUCT DESCRIPTION SECIFICATIONS 11

Stylus C40UX/C40SX/C20UX/C20SX Revision B

1.3.6 Envirormental Condition



Temperature : 10 to 35 ºC (operating *3 )

: -20 to 60 ºC(non-operating, *1)
1 month at 40 ºC
120 hours at 60 ºC



Humidity : 20 to 80% RH (operating, *2,*3)

: 5 to 85% RH (non-operating, *1, *2)



Resistance to shock : 1 G, within 1 ms (operating)

: 2 G, within 2 ms (non-operating, *1)



Resistance to vibration : 0.15G (operating)

: 0.50G (non-operating, *1)

*1: with shipment container
*2: without condensation
*3: Condition is as following figure.

1.3.8 Safety Approvals



120 V version :

Safety standards : UL1950 with D3
CSA C22.2 No.950 with D3
EMI : FCC part15 subpart B class B
CSA C108.8 class B



220-240 V version :

Safety standards : EN 60950(VDE)
EMI : EN 55022(CISPR Pub.22) class B
: AS/NZS 3548 class B

1.3.9 Acoustic Noise



Level : Approx. 45 dB(A) (According to ISO 7779)

1.3.10 CE Marking



220-240 V version

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

EN61000-3-2
EN61000-3-3
EN50082-1
IEC801-2
IEC801-3
IEC801-4

Figure 1-2. Environmental Condition

1.3.7 Reliability



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

20,000 pages (A4, Letter)
*refer to “EEPROM Address Map” on page -106



Print Head Life : 4000 million dots/nozzle

PRODUCT DESCRIPTION SECIFICATIONS 12

Stylus C40UX/C40SX/C20UX/C20SX Revision B

1.4 INTERFACE

Interface specification for each model are as the following.
Parallel Interface :EPSON Stylus C40SX .EPSON Stylus C20SX
USB Interface :EPSON Stylus C40UX .EPSON Stylus C20UX

*This printer interface as standard.

1.4.1 USB Interface

Standard : based on
“Universal Serial Bus Specifications Revision 1.1”
“Universal Serial Bus Device Class Definition for Printing Devices Version

1.1”
Bit rate : 12Mbps (Full Speed Device)
Data encording : NRZI
Adaptable connector : USB Series B
Recommended cable length : 2 meters

Connect er pin assinment and signals:

Pin No. Signal name In/Out Function description

1VCC -

2 Data bi-directional Data

Cable power. Maximum power consumption is
100mA

1.4.2 Parallel Interface (Forward Channel)

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)

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

-Ink overflow error

3 +Data bi-directiona data, pull up to +3.3V via 1.5K ohm resistor
4 Ground - C able ground

Data transmission timing :

DATA

-STROBE

BUSY

-ACKNLG

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

Figure 1-3. USB Pin Assignment

PRODUCT DESCRIPTION INTERFACE 13

Stylus C40UX/C40SX/C20UX/C20SX Revision B

Parameter Minimum Maximum Parameter Minimum Maximum

tsetup 500 ns - treply 0 ­thold 500 n s - tack 500 ns 10 us
tstb 500 ns - tnbusy 0 ­tready 0 - tnext 0 ­tbusy - 500 ns
tt-out* - 120 ns * Rise and fall time of every output signals
tt-in** - 200 ns ** Rise and fall time of every input signals

***Typical time of tack is shown below.

Parallel I/F mode typical time of tack

High speed 2us
Normal speed 4usror

Signal level : TTL compatible (IEEE-1284 level 1 device)

Parameter Minimum Maximum Condition

VOH* - 5.5 V * A low logic level on the

is.

VOL* -0.5 V -

IOH* - 0.32 mA VOH = 2 .4 V
IOL* - 12 mA VOL = 0.4 V

CO - 50 pF

VIH - 2.0 V

VIL 0.8V -

IIH - 0.32 mA VIH = 2.0 V
IIL - 12 mA VIL = 0.8 V

Logic H signal is.

2.0 V or less when the
printer is 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 7.5
K ohm to ground

Connector pin assignment and signals :

Pin No.

10 -ACKNLG 28 Out

11 BUSY 29 Out

12 PE 28 Out A high signal indicat e s paper-out error.

13 SLCT 28 Out

14 -AFXT 30 In Not used.

31 -INIT 30 In

32 -ERROR 29 Out A low signal indicates printer error condition.
36 -SLI N 30 In Not used.
18 Logic H - Out Pulled up to +5 V via 3.9 K ohm resistor.
35 +5V - Out Pulled up to +5 V via 3.3 K ohm resistor.

Signal Name

Return

1 -STROBE 19 In

2 DATA0 20 In The DATA0 through DATA7 sign als
3 DATA1 21 In
4 DATA2 22 In
5 DATA3 23 In
6 DATA4 24 In
7 DATA5 25 In
8 DATA6 26 In
9 DATA7 27 In

GND pin In/Out Functional description

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

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.

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

A high signal indicates th at the printe r cannot
receive data.

Always at high level when the printer is
powered on.

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.

CI - 50 pF

PRODUCT DESCRIPTION INTERFACE 14

Stylus C40UX/C40SX/C20UX/C20SX Revision B

Pin No.

17 Chassis GND - - Chassis GND.

16, 33

19-30

15, 34 NC - - Not connected.

Signal Name

Return

GND - - Signal GND.

GND pin In/Out Functional description

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

1.4.3 Parallel Interface (Reverse 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

Connector pin assignment and signals :

Pin No. Signal Name

2 DATA0 20 In The DATA0 through DATA7 sign als
3 DATA1 21 In
4 DATA2 22 In
5 DATA3 23 In
6 DATA4 24 In
7 DATA5 25 In
8 DATA6 26 In
9 DATA7 27 In

10 PtrClk 28 Out Printer clock signal.

11

12

13

14 HostBusy 30 In Host busy signal.

PtrBusy /

DataBit-3,7

AckDataReq /

DataBit-2,6

Xflag /

DataBit-1,5

ReturnG

ND Pin

29 Out

28 Out

28 Out

In/

Out*

Function al description

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.

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

Acknowledge data r equ est sign al a nd r ever se
channel transfer data bit 2 or 6.

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

Pin No. Signal Name

1 HostClk 19 In Host clock signal.

ReturnG

ND Pin

In/

Out*

Functional descrip tion

31 -INIT 30 In Not used.

32

36 1284-Active 3 0 In 1284 active signal.
18 Logic-H - Out Pulled up to +5 V via 3.9 K ohm resist or.
35 +5V - Out Pulled up to +5 V via 3.3 K ohm resistor.
17 Chassis GND - - Chassis GND.

16, 33

19-30

15, 34 NC - - Not connected.

-DataAvail /
DataBit-0,4

GND - - Signal GND.

29 Out

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

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

PRODUCT DESCRIPTION INTERFACE 15

Stylus C40UX/C40SX/C20UX/C20SX Revision B

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 following device ID string when it is requested.

When IEEE1284.4 is enabled,

[00H] [4EH]
MFG:EPSON;
CMD:ESCPL2,BDC,D4;
MDL:Stylus[SP]XXX;

CLS:PRINTER;

DES:EPSON[SP]Stylus[SP]XXX;
When IEEE1284.4 is disabled,
[00H] [4BH]
MFG:EPSON;
CMD:ESCPL2,BDC;
MDL:Stylus[SP]XXX;
CLS:PRINTER;
DES:EPSON[SP]Stylus[SP]XXX;

busy state. This 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.

*XXX is C20 or C40

Note : (1) [00H] denotes a hexadecimal value of zero.

(2) MDL value depends on the EEPROM setting. Refer to
Appendix F.
(3) CMD value depends on the IEEE1284.4 setting, Refer to
Appendix F.

1.4.4 Prevention Hosts from 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

PRODUCT DESCRIPTION INTERFACE 16

Stylus C40UX/C40SX/C20UX/C20SX Revision B

1.4.5 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 sa me time across a s ingle point-t o-point link. The prot ocol i s
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 (IEEE 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 (IEEE 1284.4
synchronous commands) is discarded.

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

Factory setting is on.(Refer to Appendix H.EEPROM Map 09h)

PRODUCT DESCRIPTION INTERFACE 17

Stylus C40UX/C40SX/C20UX/C20SX Revision B

1.5 OPERATOR CONTROLS

1.5.1 Operate Switch

Operate switch is located on the control panel.

1.5.2 Control Panel



Switches
There are 2 non-lock type push switches, and 2 LED.



Indicators
(1) Power (green)

Lights when the operate switch is "ON", and AC power is supplied.

(2) Error (red)

Lights or blinks when some error occurs to the printer.

1.5.3 Panel Functions



Panel Functions

SW Function

• Loads or Ejects the Paper(Pushing within 3seconds).

• Starts the Cleaning of head(Pushing for 3seconds)

Error Reset SW

*This function is not available in printing status.



Panel Function with Power on

• When carriage is on the Ink Cartridge ch ange position, return
carriage from Ink Cartridge change position.

• Starts the Ink Cartridge change (Pushing for 6seconds)

1.5.4 Printer Condition and Panel Status

Printer status

Power ON condition On - 10
Ink sequence Blink - 6
Ink Cartridge change mode Blink - 5
Data processing Blink - 9
Paper Out *1 - On 4
Paper jam condition*1 - On 3 3
Ink end(Black)*1 - On->On 8
Ink level low(Bl ack) - Blink->Blink 8
Ink end(Color)*1 - On->On 8
Ink level low(Color) - Blink->Blink 8
Ink end (Black and Color) - On->On 8
No Ink Cartridge (Black or Color)*1 - On 7
Maintenance request

(Ink Overflow Counter error)
Fatal error*1 Off On 1

“-”:Indicator status don’t change
“a->b”:a is a Indicator condition when carriage is on Home Position.

b is a Indicator condition in Ink exchange sequence.

Powe Error Priority

Alt blink Alt blink 2

Indicators

SW Function

Error Reset SW Starts status printings

*1 : see

PRODUCT DESCRIPTION OPERATOR CONTROLS 18

Stylus C40UX/C40SX/C20UX/C20SX Revision B

1.5.5 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 printer recognized the -INIT signal (negative pulse)
of parallel interface.
When printer is initialized, following action is performed.

(a) Cap the print 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 initializes the printer.
When printer is initialized, following action is performed.

1.5.6 Errors



Ink out
When the printer runs out the most part of 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 ink­cartridge in this state.



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 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 a service person.



Fatal errors
Carriage control error.

* panel status is described on section1.4.4.

(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.

PRODUCT DESCRIPTION OPERATOR CONTROLS 19

Stylus C40UX/C40SX/C20UX/C20SX Revision B

1.6 PAPER

1.6.1 Paper Handling

Do not perform reverse feed more than 0 mm(0”).

1.6.2 Paper Specification



Cut Sheet
Size : A4 (Width 210 mm(8.3") x Length 297 mm(11.7"))

: Letter (Width 215.9 mm(8.5") x Length 279.4 mm(11.0"))
: B5 (Width 182 mm(7.2") x Length 257 mm(10.1"))
: Legal (Width 215.9 mm(8.5") x Length 355.6 mm(14.0"))
: Half Letter (Width 139.7 mm(5.5") x Length 215.9 mm(8.5"))
: Exclusive (Width 184.2 mm(7.5") x Length 266.7 mm(10"))
: A5 (Width 148 mm(5.8") x Length 210 mm(8.3"))

: A6 (Width 105 mm(4.1") x Length 210 mm(8.3"))
Thickness : 0.08 mm(0.003") - 0.11 mm(0.004")
Weight : 64 g/m 2 (17 lb.55Kg) - 90 g/m 2 (24 lb.78Kg)
Quality : Exclusive paper, Bond paper, PPC



Envelope
Size : No.10 Width 241 mm(9 1/2") x Length 104.8 mm(4 1/8")

: DL Width 220 mm(8.7") x Length 110 mm(4.3")

: C6 Width 162 mm(6.4”) x Length 114 mm(4.5”)

: Envelope220*132 Width 220 mm(8.7”) x Length 132 mm(5.2”)

: Japanese CHOUKEI 3 Width 120 mm x Length 235 mm *

: Japanese CHOUKEI 4 Width 90 mm x Length 205 mm *

: Japanese YOUKEI 1 Width 120 mm x Length 176 mm *

: Japanese YOUKEI 2 Width 114 mm x Length 162 mm *

: Japanese YOUKEI 3 Width 98 mm x Length 148 mm *

: Japanese YOUKEI 4 Width 105 mm x Length 235 mm *

* except for glue.
Thickness : N/A
Weight :#10,DL,C6 45 g/m 2 (12 lb.) - 75 g/m 2 (20 lb.)

: CHOUKEI 50 g/m 2 (43Kg) - 70 g/m 2 (60Kg)

: YOUKEI 50 g/m 2 (43Kg) - 100 g/m 2 (86Kg)

Quality : #10,DL,C6 Bond paper, Plain paper, Air mail

: CHOUKEI4,3 Kraft, new Kent paper
: YOUKEI1,2,3,4 Kraft, new Kent paper

* Envelope printing is only available at normal temperature.
* Keep the longer side of the envelope horizontally at setting.



Exclusive paper
Quality : EPSON Exclusive paper
* Transparency printing is only available at normal temperature.
< Photo Quality Ink Jet Paper >
Size :A4 (210mm x 297mm)

:A6 (105mm x 148mm)
:B5 (182mm x 257mm)
:Letter (216mm x 279mm)
:Legal (216mm x 356mm)
:5” x 8” (127mm x 203mm)
:8” x 10” (203mm x 254mm)

:Post Card (100mm x 148mm)
Thickness : 0.13 mm(0.005")
Weight : 98 g/m 2 (26 lb.84Kg)

<360 dpi Ink Jet Paper >

Size : A4 (210mm x 297mm)

: Letter (216mm x 279mm)
Thickness : 0.11 mm(0.004")
Weight : 89 g/m 2 (24 lb.78Kg)

<RC paper>

Size : A4 (210mm x 297mm)

: Letter (216mm x 279mm)
Thickness : <T.B.D.>
Weight : <T.B.D.>

<Ink Jet Transparencies>

Size : A4 (210mm x 297mm)

: Letter (216mm x 279mm)
Thickness 0.13 mm(0.005")
Weight : N/A

PRODUCT DESCRIPTION PAPER 20

Stylus C40UX/C40SX/C20UX/C20SX Revision B

< Photo Quality Glossy Film >

Size : A4 (210mm x 297mm)

: A6 (105mm x 148mm)

: Letter (216mm x 279mm)
Thickness : 0.13 mm(0.005")
Weight : N/A

<Matte paper Heavy weight>

Size : A4 (210mm x 297mm)

: Letter (216mm x 279mm)
Thickness : 0.23 mm(0.009")
Weight : 167 g/m 2 (44 lb.143Kg)

< Iron-on Cool Peel Transfer Paper >

Size : A4 (210mm x 297mm)

: Letter (216mm x 279mm)
Thickness : 0.18 mm(0.007")
Weight : 124 g/m 2 (33 lb.107Kg)

*Base paper weight.

1.6.3 Printing Area



Cut Sheet

<Ink jet paper>

Size : A4 (210mm x 297mm)
Thickness : 0.11 mm(0.004")
Weight : 80 g/m 2 (21 lb.45Kg)

Figure 1-4. Printable Area for Cut Sheet

PRODUCT DESCRIPTION PAPER 21

Stylus C40UX/C40SX/C20UX/C20SX Revision B

Raster Graphics mode

Paper size

A4

Letter

B5

Lega

Statement

Executive

PW
(Paper
width)

(typ.)

210mm
(8.3”)

216mm
(8.5”)

182mm
(7.2”)

216mm
(8.5”)

139.7mm
(5.5”)

190.5mm
(7.5”)

PL
(Paper
length)

(typ.)

297mm
(11.7”)

279mm
(11.0”)

257mm
(10.1”)

356mm
(14.0”)

215.9mm
(8.5”)

254mm
(10”)

LM
(left

margin)

(min.)

3mm
(0.12”)

3mm
(0.12”)

3mm
(0.12”)

3mm
(0.12”)

3mm
(0.12”)

3mm
(0.12”)

RM

(Right

margin)

(min.)

3mm
(0.12”)

3mm
(0.12”)

3mm
(0.12”)

3mm
(0.12”)

3mm
(0.12”)

3mm
(0.12”)

TM

(Top

margin)

(min.)

3mm
(0.12”)

3mm
(0.12”)

3mm
(0.12”)

3mm
(0.12”)

3mm
(0.12”)

3mm
(0.12”)

Black BM

(Bottom margin)

(min.)

14mm (0.54”)
/3mm (0.12”)

14mm (0.54”)
/3mm (0.12”)

14mm (0.54”)
/3mm (0.12”)

14mm (0.54”)
/3mm (0.12”)

14mm (0.54”)
/3mm (0.12”)

14mm (0.54”)
/3mm (0.12”)

Color BM

(Bottom margin)

(min.)

21mm (0.83”)
/3mm (0.12”)

21mm (0.83”)
/3mm (0.12”)

21mm (0.83”)
/3mm (0.12”)

21mm (0.83”)
/3mm (0.12”)

21mm (0.83”)
/3mm (0.12”)

21mm (0.83”)
/3mm (0.12”)

* Bottom margin is expanded to 3mm when paper dimension is defined by using
command(ESC (S), otherwise it is not expanded (Black,14mm Color 21mm). Refer to
Appendix C.

** Print quality may decline in the expanded areas(For 3 mm to 14 mm (Color 21mm)
of the printing areas).



Paper

size

#10

Envelope

LM(Left

margin)

(min.)

28mm(1.10
”)

Figure 1-5. Printable Area for Envelopes

RM(Right

margin)

(min.)

3mm(0.12”) 3mm(0.12”)

TM(Top

margin)

(min.)

Black BM

(Bottom margin )

(min.)

14mm(0.54”0
/3mm(0.12”)*

Color BM

(Bottom margin)

(min.)

21mm(0.83”)
/3mm(0.12”)*

DL 7mm(0.28”) 3mm(0.12”) 3mm(0.12”)

C6 3mm(0.12”) 3mm(0.12”) 3mm(0.12”)

14mm(0.54”0
/3mm(0.12”)*

14mm(0.54”0
/3mm(0.12”)*

21mm(0.83”)
/3mm(0.12”)*

21mm(0.83”)
/3mm(0.12”)*

* Bottom margin is expanded to 3mm when paper dimension is defined by using
command ESC (S), otherwise it is not expanded (Black,14mm Color 21mm). Refer to
Appendix C .

** Print quality may decline in the expanded areas(For 3 mm to 14 mm (Color 21mm)
of the printing areas).

PRODUCT DESCRIPTION PAPER 22

Stylus C40UX/C40SX/C20UX/C20SX Revision B

1.7 INK CARTRIDGE

1.7.1 Black Ink Cartridge

Type : Exclusive cartridge
Color : Black
Print capacity : 270 pages / A4 (ISO/IEC10561 Letter Pattern at 360 dpi)
Ink life : 2 years from production date
Storage temperature : -20°C - 40°C (Storage, within a month at 40°C)

: -30°C - 40°C (Packing storage, within a month at 40°C)
: -30°C - 60°C (Transit, within 120 hours at 60°C and

within a month at 40)

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

1.7.2 Color Ink Cartridge

Type : Exclusive cartridge
Color : Magenta, Cyan, Yellow
Print capacity : 150 pages /A4 (360 dpi, 5% duty each color)
Ink life : 2 years from production date
Storage temperature : -20°C - 40°C (Storage, within a month at 40°C)

: -30°C - 40°C (Packing storage, within a month at 40°C)
: -30°C - 60°C (Transit, within 120 hours at 60°C and

within a month at 40)

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

* Ink cartridge can not re-fill, only ink cartridge is prepared for article of consumption.
* Do not use the ink cartridge which was passed away the ink life.
* Ink will be frozen under -18 to -21 o C environment, however it will be usable after

placing it more than 3 hours at room temperature. mm (0.12”) *

Ink cartridge (color) Ink cartridge (black)

PRODUCT DESCRIPTION INK CARTRIDGE 23

OPERATING PRINCIPLES

CHAPTER

2

Stylus C40UX/C40SX/C20UX/C20SX Revision B

2.1 Overview

Paper Eject Roller

This section describes the operating principles of the printer mechanism and electrical
circuit boards. The Sty lus C40UX/C40SX/C20UX/C20SX has on ly the following two
circuit boards:



Main board: C413 MAIN/MAIN-B



Power supply board: C417 PSB/PSE

PF Motor

Star Wheel Roller

PF Roller

CR Timing belt

2.1.1 Printer Mechanism

The printer mechanism for Stylus C40 UX /C40 SX/ C2 0UX /C20SX 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 C40UX/C40SX/C20UX/C20SX is
equipped with two stepping motors; one for ASF, Paper feeding/ Pump mechanism,
and one for CR mechanism. ASF unit uses rear entry fr ont eject s ystem. Th is ASF unit
is also designed newly and single LD roller loads the paper to the printer mechanism.

For cap assembly, Stylus C40UX/C40SX/C20UX/C20SX uses valveless mechanism;
new design for this model.

CR unit

HP/PE/IC Sensor sensor

LD Roller

Paper feed back plate

Paper separation pad

ASF Hopper Spring

Clutch mechanism

Pump unit

CR Motor

Cap Assembly

Figure 2-1. Printer Mechanism block diagram

Operating Principles Overview 25

Stylus C40UX/C40SX/C20UX/C20SX Revision B

2.1.2 Printhead

The printhead uses a new developed U-CHIPS head and Stylus C40UX/C40SX/
C20UX/C20SX can perform multiple shot printing and variable printing. Printhead
nozzle configuration is as follows.



48 nozzles x 1 row: Black (nozzle pitch of the row: 1/120 inch)



45 nozzles x 1 row: Color (nozzle pitch of the row: 1/120 inch)
In the one row for the color, 15 nozzles are assigned for each yellow,
magenta, cyan color)

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 (6 digits for this printhead) which adjust PZT voltage drive features.
The printer read the head ID form 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 dri ve wave generated o n MAIN board driv es PZT
and PZT pushes the top cavity which has ink stored to disc harge the ink fr om each
nozzle on the nozzle plate.

Nozzle Plate

Head Driver Board

Ink Cartridge

PZT

Needle

Filter

Cavity

Figure 2-2. Printhead Sectional Drawing



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.



Filter
When the ink cartridge is installed, if any dirt or dust around th e 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, wh ere ink is filtered.

Operating Principles Overview 26

Stylus C40UX/C40SX/C20UX/C20SX Revision B

2.1.2.1 Printing Process

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

1. 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.)

2) Ejecting State:

When the print signal is output from the C413MAIN/B board, IC (Nozzle
Selector) located on the printhead unit latches data once by 1-byte unit. 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.)

Ink Path

Nozzle

PZT

Ink Cavity

Nozzle plate

2.1.2.2 Printing Method

For print dot system, Stylus C40UX/C40SX/C20UX/C20SX has the following two
kinds of printing modes.



Multiple shot printing



Variable dot printing

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



Multiple shot printing
This printing mode is developed to improve the print quality on plain paper or
transparencies in low resolution. The multiple shot printing mode uses normal dot
and the number of dot shots varies from 1 shot to maximum 4 shots depending on
the print data to enable sharp image output even in a low resolution.



Variable dot printing
This printing mode is developed to improve the print quality on exclusive paper.
This mode is basically the same as variable dot printing mode used on other
products /; micro dot, middle dot, and large dot compose this mode. Print dot size
varies according to print data and this mode enables even sharper im age ou tput o n
exclusive paper.

PZT drive voltage

Figure 2-3. Printhead printing process

Operating Principles Overview 27

Stylus C40UX/C40SX/C20UX/C20SX Revision B

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, CR home &
I/C detector (HP/PE/IC sensor) etc. The carriage mechanism moves the carriage back
and forth according to the dr ive from the carriage motor. Th e following steppi ng motor
is mounted to drive CR mechanism. (See the table below.)

Table 2-1. Carriage Motor Specification

Items Specifications

Type 4-Phase/ 48-Pole PM Stepping motor
Drive Voltage +42 V +/ - 5% (DRV IC voltage)
Coil Resistance 10.8 Ω +/ - 10% (per phase at 25 degree)
Inductance 15 mH +/ - 20%(1KH 1VmA)
Drive Method Bi-Polar drive
Driver IC XC901503FNR2

The drive from CR motor is transferred to the CR unit via CR timing belt. And the CR
home position is detected with the HP/PE/IC sensor. This sensor is available as CR HP
detector only in the HP (home position) detection sequence & pump operation
sequence. (not available in the paper feeding sequ ence fo r the C R HP detector becaus e
it is used for only PE sensor during the paper feeding sequence.) Moreover, unlike the
previous products, this printer dose not have the PG adjustment mechanism.

CR home position is detected with the HP/PE/IC sensor and the d etection plate molded
in the CR unit as following figure. When the CR home position is detected with this
sensor, HIGH signal is output to the CPU.

HP/IC detection Lever

CR HP dete ction plate

Right side view

CR HP detection plate

HP/IC detection
Lever

Low signal

High signal

Figure 2-5. CR home position

Unlike the previous products, I/C detection sensor is not built in the CR unit.
The I/C is detected with the HP/PE/IC sensor and the detection plate mo lded on the I/C
cover as following figure. The I/C installation condition is monitored only when the
CR unit moves to the I/C detection position (HP detection sequence). So, this sensor
function is not available in the paper feeding sequence. When the I/C is not installed
into the CR unit, HIGH signal is output to the CPU.

HP/IC detection Lever

Right side view

I/C detection plate

HP/PE/ICSensor

CR Motor

High signal

I/C detection plate

HP/IC detection
Lever

Low signal High signal

Figure 2-6. I/C detection position

CR unit

CR Timing belt

Figure 2-4. Carriage Mechanism (Top view)

Operating Principles Overview 28

Stylus C40UX/C40SX/C20UX/C20SX Revision B

Also, when replacing ink use this lever to confirm whether the cover cartridge is open
or closed.

There are separate replacement positions for replacing the Black and Color ink
cartridges. If the cover cartridge is open, the I/C detection plate makes contact with the
HP/IC detection lever, causing the HP/IC sensor to detect a high signal.

HP/IC detection Lever

I/C detection plate

Right side view

High signal

I/C detection plate

HP/IC
detection Lever

Low signal

Figure 2-7. I/C change position

If a High signal is detected even once, it is regarded as if that ink cartridge was
replaced and the cleaning and ink counters are cleared.
If the High signal is not detected even once, the cleaning and ink counter are not
cleared.

If both the ink cartridges have not been set before carrying out initial filling, the
carriage moves to the position where both ink cartridges can be set, but checking if the
cartridge is open or closed is not done.
If one of the ink cartridges has not been set, the carriage moves to the replacement
position of the ink cartridge that is not set due to one time prevention of the set ink
cartridge.

Operating Principles Overview 29

Stylus C40UX/C40SX/C20UX/C20SX Revision B

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 2-8. Following shows you how to transfer the PF motor drive to the
PF roller and the Paper Eject Roller.

 PF motor drive transmission path

PF Motor Pini on Gear (CW)

→

Spur Gear 60 (PF roller)(CCW)

→

Spur Gear 60 (PF roller)(CCW)

Table 2-2.

Item Description

Motor type 4-Phase/ 48-Pole PM Stepping motor
Drive voltage +42 V +/ - 5% (DRV IC voltage)
Coil Resistance 10 Ω +/ - 10% (per phase)
Inductance 10.5 mH +/ - 20%(1kH 1Vrms)
Driving method Bi-Polar drive
Driver IC XC901503FNR2

Change Lever

PF Motor Specifications

Spur Gear 35.2

Combination

Gear 16, 32

PF roller

Spur Gear 10. 8

Spur Gear 18. 28

Spur Gear 25.6

Spur Gear 27. 2

Figure 2-8. Paper Feeding Mechanism

Paper loaded from ASF is advanced by the following roller.



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

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

→ Paper

Operating Principles Overview 30