Epson LC4511TM, LC-4521 Service Manual

DOT MATRIX PRINTER

LC- 4511

LC- 4521

TECHNICAL MANUAL

[

SECOND EDITION

]

NOTICE

form whatsoever, without STAR’s express permission is forbidden.

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

• All efforts have been made to ensure the accuracy of the contents

of this manual at the time of going to press. However, should any errors be detected, STAR would greatly appreciate being informed of them.

• The above notwithstanding, STAR can assume no responsibility

for any errors in this manual.

INTRODUCTION

This manual describes the LC-4511,4521 dot matrix printer. It is designed for use as a reference for periodic inspections and maintenance procedures to be executed by service personnel. It is not intended for the general user. Users of this manual should have a basic knowledge and understanding of the English language.

• This manual is divided into the following sections:

Chapter 1 General Specifications Chapter 2 Theory of Operation Chapter 3 Adjustments Chapter 4 Parts Replacement Chapter 5 Maintenance and Lubrication Chapter 6 Troubleshooting Chapter 7 Parts List

1 2

3 4

• First edition : Mar. 1996

Second edition : Aug. 1997

5 6 7

CHAPTER 1

GENERAL SPECIFICATIONS

1. General Specifications..........................................................................................3

2. External Appearance and Composition ..............................................................6

3. Control Panel .........................................................................................................8

3-1. Switch Combination Functions ............................................................................. 8

3-2. EDS Mode Settings................................................................................................. 9

4. Parallel Interface..................................................................................................10

4-1. General Specifications ......................................................................................... 10

4-2. Connector Signals ................................................................................................ 10

5. Serial Interface (optional) ...................................................................................11

5-1. General Specifications ......................................................................................... 11

5-2. Connector Signal and Functional Descriptions (SPC-8K, IS-8H192)............... 12

5-3. DIP Switch Settings (SPC-8K, IS-8H192) ............................................................ 12

6. EE-PROM mode ...................................................................................................13

6-1. Outline ................................................................................................................... 13

6-2. Explanation of special control codes ................................................................. 13

6-3. EE-PROM MAP ...................................................................................................... 14

6-4. Rewriting the EE-PROM ....................................................................................... 17

GENERAL SPECIFICATIONS

1. General Specifications

Printing System Serial Impact Dot-Matrix Printing Speed Pitch Draft (cps/dpi) LQ (cps/dpi)

LC-4521

LC-4511 Pica (10 cpi) 225/120H 75/360H

Print Direction Draft: Bi-directional logic seeking

Print Head Number of pins: 24

Line Spacing 1/6”, 1/8”,7/60”,n/180”,n/360”

Character Matrix Pitch Draft LQ

LC-4521

LC-4511 Pica (10 cpi) 24 × 9H 24 × 31H

Pica (10 cpi)

Elite (12 cpi) 360/120H 120/360H Semi-condensed(15 cpi(S)) 450/120H 150/360H Semi-condensed(15 cpi(I)) 225/240H 150/360H Condensed pica (17 cpi) 255/240H 170/360H Condensed elite (20 cpi) 300/240H 198/360H

24cpi (I) 360/240H 238/360H

Elite (12 cpi) 270/120H 90/360H Semi-condensed(15 cpi(S)) 337/120H 112/360H Semi-condensed(15 cpi(I)) 168/240H 1112/360H Condensed pica (17 cpi) 191/240H 127/360H Condensed elite (20 cpi) 225/240H 149/360H

24cpi (I) 270/240H 178/360H H: half-dot (S) : Standard mode only (I) : IBM mode only

LQ: Bi-directional logic seeking Bit-Image: Uni-directional/ bi-directional logic seeking (selectable)

Life: 200 million dots/pin (Normal Mode)

7/72”, n/72”, n/216” : software

Pica (10 cpi) Elite (12 cpi) 24 × 9H 24 × 27H

Semi-condensed(15 cpi(S)) 16 × 7H 16 × 21H Semi-condensed(15 cpi(I)) 24 × 9H 24 × 16H Condensed pica (17 cpi) 24 × 9H 24 × 16H Condensed pica (20 cpi) 24 × 9H 24 × 16H

24cpi (I) 24 × 9H 24 × 14H

Elite (12 cpi) 24 × 9H 24 × 27H Semi-condensed(15 cpi(S)) 16 × 7H 16 × 21H Semi-condensed(15 cpi(I)) 24 × 9H 24 × 16H Condensed pica (17 cpi) 24 × 9H 24 × 16H Condensed elite (20 cpi) 24 × 9H 24 × 16H

24cpi (I) 24 × 9H 24 × 14H

300/120H (Normal)

400/80H (HS)

100 million dots/pin (Multi-Part Mode)

24 × 9H (Normal)

24 × 7H (HS)

– 3 –

100/360H

24 × 31H

GENERAL SPECIFICATIONS

H: half-dot (S) : Standard mode only (I) : IBM mode only

Environment Operating temperature: 41°F to 95°F (5°C to 35°C)

Storage temperature: –22°F to 149°F (–30°C to 65°C) Operating humidity: 30% to 80% (non-condensing) Storage humidity: 20% to 90% (non-condensing)

Paper Cut-sheet (manual feeding)

Paper width: 7” to 16.54” / 178 to 420 mm Paper length: 5.5” to 14” / 140 to 356 mm Paper thickness: 0.00276” to 0.00472” / 0.07 to 0.12 mm

Paper weight: 14 to 24 lbs. / 52 to 90 g/m2 / 45 to 77 kg Cut-sheet (with optional automatic sheet feeder) Paper size: B5, A4, LT, B4, A3, Legal Paper thickness: 0.00315” to 0.00472” / 0.08 to 0.12 mm Paper weight: 16 to 24 lbs. / 60 to 90 g/m2 / 52 to 77 kg Hopper: 50 sheets of 64 g/m

30 sheets of 80 g/m Stacker: 10 sheets Fanfold (with push tractor feeder) Paper width: 4” to 16.5” / 101.6 to 419 mm Paper thickness: 0.00276” to 0.00433” / 0.07 to 0.11 mm (one-ply)

0.01378” / 0.35 mm maximum (total thickness of multi-ply

paper, non-carbon) Paper weight: 14 to 22 lbs. / 52 to 82 g/m2 / 45 to 70 kg (one-ply)

11 to 14 lbs. / 40 to 52 g/m2 / 34 to 45 kg (multi-ply) Copies: Original + 1 or 2 (Normal Mode)

Original + 3 or 4 (Multi-Part Mode)

* Multi-Part Mode is recommended when using optional

pull tractor unit. Fanfold (with optional pull tractor feeder) Paper width: 4” to 16.0” / 101.6 to 406 mm Paper thickness: 0.00276” to 0.00433” / 0.07 to 0.11 mm (one-ply)

0.01378” / 0.35 mm maximum (total thickness of multi-ply

paper, non-carbon) Paper weight: 14 to 22 lbs. / 52 to 82 g/m2 / 45 to 70 kg (one-ply)

11 to 14 lbs. / 40 to 52 g/m2 / 34 to 45 kg (multi-ply) Copies: Original + 1 or 2 (Normal Mode)

Original + 3 or 4 (Multi-Part Mode) Labels Backing sheet: 4.5” to 16.5” / 114 to 419 mm Thickness

Backing sheet: 0.00268” to 0.0035” / 0.07 to 0.09mm Total: 0.0075” / 0.19mm max.

– 4 –

GENERAL SPECIFICATIONS

Emulation Standard Mode: EPSON ESC/P (24-pin)

NEC Graphic compatible IBM Mode: Proprinter XL24E

Interface Standard: Centronics parallel

Option: RS-232C/RS-422 serial

Ribbon Type On-carriage, dedicated

Monochrome (Y24WH), Black only

Ribbon Life 2.5 million characters (Draft 10 cpi) Power Supply 120V AC +10%/–17%, 230V AC +14%/–13%; 50/60Hz

(depending on country of purchase)

Power Consumption

LC-4521 14W during standby / 63W during ASCII draft printing LC-4511 9W during standby / 45W during ASCII draft printing

Options PT-15HA Pull Tractor Unit

SF-15HA Single-Bin Automatic Sheet Feeder IS-8H192 Serial Interface Unit IS-32H768 Serial Interface Unit SPC-8K Serial-To-Parallel Converter

Weight : 19.2lbs/8.7kg

590mm

23.2"

Fig. 1-1 External dimensions

– 5 –

355mm

13.9"

7.3"

186mm

GENERAL SPECIFICATIONS

2. External Appearance and Composition

Front cover

Paper guide

Mute cover

Control panel

Fig. 1-2 Front view of the Printer

Interface connector

Release lever

Power switch

Platen knob

Fig. 1-3 Rear view of the Printer

– 6 –

Fig. 1-4 Front cover removed

GENERAL SPECIFICATIONS

Fig. 1-5 Diagram of internal layout

– 7 –

GENERAL SPECIFICATIONS

3. Control Panel

3-1. Switch Combination Functions

HS-DRAFT/DRAFT

ROMAN

SANSERIF

COURIER

PRESTIGE

ORATOR

EDS

BANK

FONT

BANK

Panel Macro

Set TOF

Buffer Clear & All Reset

Font & Pitch Lock

10 CPI 12 CPI 15 CPI

COND

PROP

PITCH

SWITCH

SET/EJECT

PARK

STATUS

Hex Dump ModePitch Lock

Aging Mode

Dot-Adjustment Print Mode

MICRO FEED

FORM FEED

ON/OFF

Auto Loading Position Change Mode

Dot-Adjustment Mode

LINE FEED

Forward

EDS Mode

POWER

ON LINE

EXIT

On-LineLine FeedForm FeedPitch Selection Set/Eject/ParkFont Selection

Micro FeedBack ward

Off-LineTear off (Short) Tear off (Long) Quiet Mode

Short Test Long Test Multi-part ModeFont Lock

OFF-LINE

ON-LINE

NextRightLeft

EE-PROM Data Initialize

On/Off

Factory settings

PrintSwitch StatusBank

ForwardPaper Loading Back ward

Save

Exit

Cancel

Set

AUTO LOADING POSITION CHANGE MODE

POWER-ON

EDS MODE

DOT-ADJUSTMENT MODE

– 8 –

GENERAL SPECIFICATIONS

3-2. EDS Mode Settings

Bank Switch Function ON OFF

A 1 Emulation STANDARD / EPSON IBM

B 1 Graphics Direction Bi-directional Uni-directional

C 1, 2 Print Mode

D 1,2,3,4 Page Length

E 1,2,3,4,5 IBM Code Page (CT=Graphics, IBM #1, #2)

F 1, 2, 3, 4, 5 NLQ Font Selection

2 Character Table (CT) Standard / EPSON mode Graphics Italics

IBM mode IBM #2 IBM #1 3 RAM Usage Input Buffer Download Buffer 4 Auto Sheet Feeder Not installed Installed 5 Paper Out Enabled Disabled 6 Multi-Part Mode Disabled Enabled

2 Tear-off Disabled Enabled 3 Line Spacing 1/6" 1/8" 4 Auto LF with CR Disabled Enabled 5 Zero Style Normal Slashed 6 Strobe Timing Normal Reverse

LQ ON ON Draft OFF ON HS-Draft ON OFF

3,4,5 Print Pitch

10cpi ON ON ON Proportional OFF ON OFF 12cpi OFF ON ON 15cpi ON OFF ON 17cpi OFF OFF ON 20cpi ON ON OFF

6 Quiet Disabled Enabled

11"/Letter ON ON ON ON 14"/Legal OFF ON OFF ON 8" OFF ON ON ON 10.5"/Executive ON OFF OFF ON

11.7"/A4 ON OFF ON ON 7.25"/Executive OFF OFF OFF ON 12" OFF OFF ON ON 3.5" ON ON ON OFF

8.5"/Letter ON ON OFF ON 5.5" OFF ON ON OFF

5 CR Centering Position Long Short

#437 ON ON ON ON ON #3844 ON OFF ON OFF ON #850 OFF ON ON ON ON #3845 OFF OFF ON OFF ON #860 ON OFF ON ON ON #3846 ON ON OFF OFF ON #861 OFF OFF ON ON ON #3847 OFF ON OFF OFF ON

#863 ON ON OFF ON ON #3848 ON OFF OFF OFF ON

#865 OFF ON OFF ON ON #852 OFF OFF OFF OFF ON #866 ON OFF OFF ON ON #737 ON ON ON ON OFF #3840 OFF OFF OFF ON ON #851 OFF ON ON ON OFF #3841 ON ON ON OFF ON #869 ON OFF ON ON OFF #3843 OFF ON ON OFF ON #928 OFF OFF ON ON OFF

International Character Set (CT=Italics)

U.S.A. ON ON ON ON ON Japan ON ON ON OFF ON France OFF ON ON ON ON Norway OFF ON ON OFF ON Germany ON OFF ON ON ON Denmark-2 ON OFF ON OFF ON England OFF OFF ON ON ON Spain-2 OFF OFF ON OFF ON Denmark-1 ON ON OFF ON ON Latin America ON ON OFF OFF ON Sweden OFF ON OFF ON ON Korea OFF ON OFF OFF ON Italy ON OFF OFF ON ON Ireland ON OFF OFF OFF ON Spain-1 OFF OFF OFF ON ON Legal OFF OFF OFF OFF ON

Roman ON ON ON ON ON Sanserif OFF ON ON ON ON Courier ON OFF ON ON ON Prestige OFF OFF ON ON ON Orator OFF OFF OFF ON ON

Option

Script ON ON OFF ON ON Cinema ON OFF OFF OFF ON OCR-B OFF ON OFF ON ON Code 39 OFF OFF OFF OFF ON OCR-A ON OFF OFF ON ON UPC/EAN ON ON ON ON OFF Orator-2 ON ON ON OFF ON Old-Stile OFF ON ON ON OFF TW-Light OFF ON ON OFF ON Firenze ON OFF ON ON OFF L-Gothic ON OFF ON OFF ON Arabic Naskh OFF OFF ON ON OFF Blippo OFF OFF ON OFF ON Arabic Koufi ON ON OFF ON OFF H-Gothic ON ON OFF OFF ON Orane OFF ON OFF OFF ON

Arabic Naskh-Eilani

OFF ON OFF ON OFF

– 9 –

GENERAL SPECIFICATIONS

4. Parallel Interface

4-1. General Specifications

Item Specifications

Interface Centronics-compatible Synchronization System Via externally supplied STROBE pulse I/F Protocol Using ACK and BUSY signals Logic Level Compatible with TTL level

ACK

Data

STROBE

(EDS B-6 : ON)

STROBE

(EDS B-6 : OFF)

BUSY

5µs

tttt

t : More than 0.5µs

Fig. 1-6 Timing Charts for Parallel Interface

4-2. Connector Signals

Pin Name Function

1 STROBE Goes low for ≥ 0.5µs when active. 2 DATA0 3 DATA1 4 DATA2 5 DATA3 6 DATA4 7 DATA5 8 DATA6 9 DATA7

10 ACK 10µs low to acknowledge receipt of data. 11 BUSY Printer sets line low when ready to receive data. 12 PAPER High when paper runs out. 13 SELECT High when printer is on-line. 14 AFXT Printer ignores this signal. 15 Not used. 16 SIGNAL GND Signal ground 17 CHASSIS Chassis ground (isolated from signal ground) 18 +5V +5V DC output from printer

19~30 GND Twisted pair ground return

31 RESET Printer is reset when this signal goes low. 32 ERROR Low when printing cannot continue due to error. 33 EXT GND External ground

34~35 Not used

36 SELECT IN Printer ignores this signal.

These signals represent information for the 1st through 8th bit of parallel data, respectively. Each signal is HIGH when data is logical 1, and LOW when logical 0.

– 10 –

GENERAL SPECIFICATIONS

5. Serial Interface (optional)

When using the serial interface, the optional Serial-Parallel Converter must be connected to the printer.

5-1. General Specifications

(SPC-8K)

Interface RS-232C-level Synchronization Asynchronous Baud rate 150, 300, 600, 1200, 2400, 4800, 9600, 19200 BPS (selectable) Word length

Start bit 1 Data bits 7 or 8 (selectable) Parity bit Odd, even, none (selectable) Stop bits One or more

Signal polarity

Mark Logical 1 (-3V to -15V) Space Logical 0 (+3V to +15V) Handshaking DTR, XON/XOFF, ETX/ACK Data buffer 8 kbytes (standard)

(IS-8H192)

Interface RS-232C-level only Synchronization Asynchronous Baud rate 150, 300, 600, 1200, 2400, 4800, 9600, 19200 BPS (selectable) Word length

Start bit 1 Data bits 7 or 8 (selectable) Parity bit Odd, even, none (selectable) Stop bits One or more

Signal polarity

Mark Logical 1 (–3V to –15V) Space Logical 0 (+3V to +15V) Handshaking DTR, XON/XOFF, ETX/ACK Data buffer 8 kbytes (standard)

(IS-32H768)

RS-232C Interface

Synchronization Asynchronous Baud rate 150, 300, 600, 1200, 2400, 4800, 9600, 19200 BPS (selectable) Word length

Start bit 1 Data bits 7 or 8 (selectable) Parity bit Odd, even, none (selectable) Stop bits One or more

Signal polarity

Mark Logical 1 (–3V to –15V) Space Logical 0 (+3V to +15V) Handshaking DTR, XON/XOFF, ETX/ACK Data buffer 32 kbytes (standard)

RS-422A Interface

Synchronization Asynchronous Baud rate 150, 300, 600, 1200, 2400, 4800, 9600, 19200 , 38400, 76800 BPS (selectable) Word length

Start bit 1 Data bits 7 or 8 (selectable) Parity bit Odd, even, none (selectable) Stop bits One or more

Signal polarity

Mark Logical 1 (A is –0.2 V or less than B) Space Logical 0 (A is +0.2 V or more than B) Handshaking DTR, XON/XOFF, ETX/ACK Data buffer 32 kbytes (standard)

– 11 –

GENERAL SPECIFICATIONS

5-2. Connector Signal and Functional Descriptions (SPC-8K, IS-8H192)

Pin No. Signal name Direction Function

1 GND — 2 TXD OUT 3 RXD IN 4 RTS OUT

5 CTS — 6NC

7 GND —

8~10 NC

11 RCH OUT

12~19 NC

20 DTR OUT

21~25 NC

Printer chassis ground. This pin carries data from the printer. This pin carries data to the printer. Always space. This signal is space when the computer is ready to send data.

The printer does not check this pin. Unused. Signal ground. Unused. The printer sets this signal to space when it is ready to receive data.

This line carries the same signal as pin 20. Unused. The printer sets this signal to space when it is ready to receive data. Unused.

5-3. DIP Switch Settings (SPC-8K, IS-8H192)

Switch ON OFF

1 8 data bits 7 data bits 2 No parity Parity checked 3 4 5 Odd parity Even parity 6 7 Data transfer rate – see table below 8

All switches are set to ON before the printer leaves the factory.

Baud rate Switch 6 Switch 7 Switch 8

150 OFF OFF OFF 300 OFF OFF ON

600 OFF ON OFF 1200 OFF ON ON 2400 ON OFF OFF 4800 ON OFF ON 9600 ON ON OFF

19200 ON ON ON

Handshaking protocols – see table below

Protocol Switch 3 Switch 4

DTR mode ON ON XON/XOFF mode ON OFF ETX/ACK mode OFF ON

– 12 –

GENERAL SPECIFICATIONS

6. EE-PROM mode

6-1. Outline

These settings can be changed in the EE-PROM mode by writing data directly to the EE-PROM on the main logic board:

Setting EE-PROM mode

• Send <ESC><SUB>(09)H command.

Canceling EE-PROM mode

• Initialize the printer by sending <ESC>@

6-2. Explanation of special control codes

<ESC>@ Exits printer from EE-PROM mode and initializes the printer. <ESC>M@ Returns all data in the EE-PROM to the factory settings. After the buffer is cleared, the buzzer sounds. If

the printer is powered off before the buzzer sounds, all data in the buffer is not cleared.

If all data is not cleared from the buffer, operation is not guaranteed. Be sure to allow the buzzer to sound before you turn the printer off!

<ESC>MWn

Code Function Address Capacity

<ESC>MW0 <data> Stores data into entire area of EE-PROM. 00H-7FH 128bytes <ESC>MW1nm Stores data (m) into the address (n) nH 1 byte <ESC>MW2<data> Stores auto-start software data into 40H-5EH 30bytes

EE-PROM. 5FH-7DH 30bytes

• The data (m) used in the commands above are stored in the specified address in order (n).

• When the data to be stored exceeds the specified capacity, subsequent data are ignored.

• Data are stored in the EE-PROM according to the memory map. (See section 3. EDS mode setting and 6-3. EE-PROM Map.)

• After all data are stored, a beep indicates the completion of storage.

• If the printer is powered off during data storage, data stored before power off are valid, but subsequent operation of the printer is not guaranteed.

Do not power off the printer while data is being stored!

<ESC>MR Dumps all data in the EE-PROM to a hard copy.

For an example of using these control codes, see section 6-4. For the corresponding EE-PROM addresses, see the EE-PROM memory map in section 3-2. EDS mode setting and 6-3 EE-PROM Map.

– 13 –

GENERAL SPECIFICATIONS

6-3. EE-PROM MAP

Address Function Factory data

00H EDS setting FFH

Bit Function 1 0

b0 Emulation

Character Table

b1 Standard / EPSON mode Graphics Italics

IBM mode IBM #2 IBM #1

b2 RAM Usage Input Buffer b3 Auto Sheet Feeder Not installed Installed b4 Paper out Detector Enabled Disabled b5 Multi-Part Mode Disabled Enabled

01H EDS setting FFH

Bit Function 1 0

b0 Graphics Direction Bi-directional Uni-directional b1 Tear-off Disabled Enabled b2 Line Spacing 1/6" 1/8" b3 Auto LF with CR Disabled Enabled b4 Zero Style Normal Slashed b5 Strobe Timing Normal Reverse

STANDARD/EPSON

IBM

Download Buffer

02H EDS setting FFH

Print Mode Function b2 b3 b4

Function b0 b1 10cpi 1 1 1

LQ 1 1 12cpi 0 1 1 Draft 0 1 15cpi 1 0 1 HS-Draft 1 0 17cpi 0 0 1

20cpi 1 1 0 Proportional 0 1 0

Bit Function 1 0

b5 Quiet Disabled Enabled

03H EDS setting FFH

Page Length

Function b0 b1 b2 b3 Function b0 b1 b2 b3

11"/Letter 1111 14"/Legal 0 1 0 1 8" 0111 10.5"/Executive 1 0 0 1

11.7"/A4 1011 7.25"/Executive 0 0 0 1 12" 0011 3.5" 1 1 1 0

8.5"/Letter 1101 5.5" 0 1 1 0

Print Pitch

Bit Function 1 0

b4 CR Centering Position Long Short

– 14 –

GENERAL SPECIFICATIONS

Address Function Factory data

04H EDS setting FFH

IBM Code Page (Character Table=Graphics, IBM#1, #2)

Function b0 b1 b2 b3 b4 Function b0 b1 b2 b3 b4

#437 1 1 1 1 1 #3844 1 0 1 0 1 #850 0 1 1 1 1 #3845 0 0 1 0 1 #860 1 0 1 1 1 #3846 1 1 0 0 1 #861 0 0 1 1 1 #3847 0 1 0 0 1 #863 1 1 0 1 1 #3848 1 0 0 0 1 #865 0 1 0 1 1 #852 0 0 0 0 1 #866 1 0 0 1 1 #737 1 1 1 1 0 #3840 0 0 0 1 1 #851 0 1 1 1 0 #3841 1 1 1 0 1 #869 1 0 1 1 0 #3843 0 1 1 0 1 #928 0 0 1 1 0

International Character Set (Character Table=Italics)

Function b0 b1 b2 b3 b4 Function b0 b1 b2 b3 b4

U.S.A. 1 1 1 1 1 Japan 1 1 1 0 1 France 0 1 1 1 1 Norway 0 1 1 0 1 Germany 1 0 1 1 1 Denmark-2 1 0 1 0 1 England 0 0 1 1 1 Spain-2 0 0 1 0 1 Denmark-1 1 1 0 1 1 Sweden 0 1 0 1 1 Korea 0 1 0 0 1 Italy 1 0 0 1 1 Ireland 1 0 0 0 1 Spain-1 0 0 0 1 1 Legal 0 0 0 0 1

Latin America

11001

05H EDS setting FDH

NLQ Font Selection Option

Function b0 b1 b2 b3 b4 Function b0 b1 b2 b3 b4

Roman 1 1 1 1 1 Script 1 1 0 1 1 Sanserif 0 1 1 1 1 OCR-B 0 1 0 1 1 Courier 1 0 1 1 1 OCR-A 1 0 0 1 1 Prestige 0 0 1 1 1 Orator-2 1 1 1 0 1 Orator 0 0 0 1 1 TW-Light 0 1 1 0 1

L-Gothic 1 0 1 0 1 Blippo 0 0 1 0 1 H-Gothic 1 1 0 0 1 Orane 0 1 0 0 1 Cinema 1 0 0 0 1 Code 39 0 0 0 0 1 UPC/EAN 1 1 1 1 0 Old-Style 0 1 1 1 0 Firenze 1 0 1 1 0 Arabic Naskn 0 0 1 1 0 Arabic koufi 1 1 0 1 0 Arabic Naskn-Eilani

06H (Not used) 00H 07H Misalignment correction 60 DPI (F) 80H 08H Misalignment correction 80 DPI (H) HS-DRAFT 80H 09H Misalignment correction 80 DPI (F) 80H

0AH Misalignment correction 120 DPI (H) 80H

01010

– 15 –

GENERAL SPECIFICATIONS

Address Function Factory data

0BH Misalignment correction 120 DPI (F) 80H 0CH Misalignment correction 180 DPI (H) 80H 0DH Misalignment correction 180 DPI (F) 80H

0EH Misalignment correction 240 DPI (H) 80H 0FH Misalignment correction 360 DPI (H) 80H 10H Misalignment correction 120 DPI (H) DRAFT-TEXT 80H 11H Misalignment correction 360 DPI (H) LQ-TEXT 80H 12H (Not used) 00H 13H Misalignment correction Multi-part Mode 60 DPI (F) 80H 14H Misalignment correction Multi-part Mode 80 DPI (H) HS-DRAFT 80H 15H Misalignment correction 80 DPI (F) 80H 16H Misalignment correction Multi-part Mode 120 DPI (H) 80H 17H Misalignment correction Multi-part Mode 120 DPI (F) 80H 18H Misalignment correction Multi-part Mode 180 DPI (H) 80H

19H Misalignment correction Multi-part Mode 180 DPI (F) 80H 1AH Misalignment correction Multi-part Made 240 DPI (H) 80H 1BH Misalignment correction Multi-part Made 360 DPI (H) 80H 1CH Misalignment correction Multi-part Made 120 DPI (H) DRAFT-TEXT 80H 1DH Misalignment correction Multi-part Made 360 DPI (H) LQ-TEXT 80H

1EH (Not used) 00H

1FH Misalignment correction Half-dot Made 60 DPI (F) 80H

20H Misalignment correction Half-dot Made 80 DPI (H) HS-DRAFT 80H

21H Misalignment correction 80 DPI (F) 80H

22H Misalignment correction Half-dot Made 120DPI (H) 80H

23H Misalignment correction Half-dot Made 120 DPI (F) 80H

24H Misalignment correction Half-dot Made 180 DPI (H) 80H

25H Misalignment correction Half-dot Made 180 DPI (F) 80H

26H Misalignment correction Half-dot Made 240 DPI (H) 80H

27H Misalignment correction Half-dot Made 360 DPI (H) 80H

28H Misalignment correction Half-dot Made 120 DPI (H) DRAFT-TEXT 80H

29H Misalignment correction Half-dotMade 360 DPI (H) LQ-TEXT 80H 2AH (Not used) 00H

2BH, 2CH Top Margin in Auto-loading Friction 3CH

00H

2DH, 2EH Top Margin in Auto-loading Tractor 3CH

00H

2FH, 30H Top Margin in Auto-loading ASF 3CH

00H

31H Paper End Sensor A/D Valve 99H

32H~35H Macro set for Standard/EPSON Mode 00H

00H

36H~39H Macro set for IBM Mode 00H

00H

3AH, 3BH TEAR OFF (Short) 00H

80H

3CH, 3DH TEAR OFF (Long) 00H

80H

– 16 –

GENERAL SPECIFICATIONS

Address Function Factory data

3EH, 3FH IBM Initial Condition Area FFH

FFH

40H~5EH Auto Start Area for Standard/EPSON Mode 00H

00H

5FH~7CH Auto Start Area for IBM Mode 00H

00H 7DH <FF> Control Code (00H = Space / 0FH = Null) 00H 7EH Colour Information 00H

7FH EE-PROM Check Code 01H

6-4. Rewriting the EE-PROM

Follow this procedure to rewrite the EE-PROM. (1) Turn the printer on. (2) Turn the computer on. (3) Load a BASIC disk in the computer. (4) Set a sheet of paper in the printer, and press the SET switch. (5) Enter the program listed below and run the program.

10 LPRINT CHR$(27);CHR$(26);CHR$(&H09) 20 LPRINT CHR$(27);”MW1";CHR$(&H01);CHR$(&HFB) 30 LPRINT CHR$(27);”MR”

BASIC Program Code What It Does

10 LPRINT CHR$(27);CHR$(26);CHR$(&H09) Enters the EE-PROM mode. 20 LPRINT CHR$(27);”MW1"; Starts rewriting the EE-PROM. CHR$(&H01); Address data from &H01 will show

EDS mode from the EE-PROM memory map.

CHR$(&HFB) Data from &HFB will change the Line

spacing from 1/6" to 1/8".

30 LPRINT CHR$(27);”MR” Dumps all EE-PROM data to hexadeci-

mal.

(6) To complete the setting, turn the printer off.

– 17 –

CHAPTER 2

THEORY OF OPERATION

1. Block Diagram .....................................................................................................21

2. General Flow Chart (Main Logic Board)............................................................22

3. Power Supply Circuit ..........................................................................................23

4. Mechanism...........................................................................................................24

4-1. Print Head Mechanism ......................................................................................... 24

4-2. Print Head Carrying Mechanism ......................................................................... 25

4-3. Ink ribbon feed mechanism ................................................................................. 26

4-4. Paper Feed Mechanism........................................................................................ 27

4-5. Detectors ............................................................................................................... 28

1. Block Diagram

The block diagram of this printer is shown in Fig. 2-1.

Data (From Host Computer)

THEORY OF OPERATION

Print head

LED

Switch

Control panel board

Power supply unit

AC Power

Parallel interface

Gate array

Masked ROM



4M



 

UVE-PROM

EE-PROM

Main logic board

Driver



CPU

Driver

RAM



Carriage motor

Detectors

Paper feed motor

Printer mechanism

Fig. 2-1 Block Diagram

(1) Main Logic Board



This board receives data from the host computer and stores it in the RAM in the order it arrives. The CPU on this board reads the data from the RAM, and edits it according to the program stored in the ROM. When editing is completed, various drive signals from the CPU are sent to the printer mechanism to perform printing.

Explanation

• CPU TMP90C041 Controls this printer.

• UVE-PROM 1M bit Contains the program which executes control of the printer. UVE-PROM is not provided with some versions of the software.

• Masked ROM 4M bit Contains the character font.

• EE-PROM KM93C46 64 × 16 bits Contains the data (EDS data and so on) in the memory switch.

• RAM 512K bit Used as a stack area, work area and data buffer of the CPU.

• Parallel interface

• Gate array (custom IC) Inputs/outputs several signals.

• Driver The data edited by the CPU and gate array are sent to the printer mechanism after conversion to the signal for the print head drive and motor drives.

(2) Control panel board

Panel circuit for manual control of the printer.

(3) Printer Mechanism

Consists of a print head, carriage motor, paper feed motor, and detectors.

(4) Power Supply Unit

Converts AC power to LC-4511 : 33VDC , LC-4521 : 40VDC and 5VDC.

– 21 –

THEORY OF OPERATION

2. General Flow Chart (Main Logic Board)

The flow chart below shows you the general flow of editing and printing operations.

POWER ON

Initialization

Ready state

Read data

Control code

Data processing

Control

code?

YES

processing

Print?

YES

or printing

Return?

YES

Data

storage

(Line buffer determination)

(Print out of data)

Return action

Fig. 2-2 General Flow Chart of Editing and Printing

– 22 –

THEORY OF OPERATION

3. Power Supply Circuit

A ringing choke converter type circuit is used with a dropper type circuit in the power supply unit, fulfilling the input and output conditions described in the chart below.

Voltage Range Max. Current Output Service Circuit Type

Input

Output

120VAC 1.0 A

220Vto 240VAC 0.6 A

5 VDC ±5% 0.3A Dropper

For logic circuit drive, for motor holding.

33 VDC ±5% (LC-4511) 3.2A(LC-4511) Ringing choke 40 VDC ±5% (LC-4521) 4.4A (LC-4521) converter.

For print head drive, for motor drive.

Input

120VAC 220VAC 230VAC 240VAC   

Noise filter circuit

Switching section (Transistor Q1)

Control circuit

In rush current protection circuit

Transformer T1

PC1

Photo-Coupler

Rectifier circuit

Ringing choke converter

Dropper circuit

Voltage reference

Fig. 2-3 Power Supply unit block diagram

Out put 33V DC ; LC-4511 40V DC ; LC-4521

Out put 5V DC

– 23 –

THEORY OF OPERATION

4. Mechanism

4-1. Print Head Mechanism

The print head consists of 24 needle wires and 24 print solenoids. The following explains how each needle wire operates during printing. (1) When the print solenoid is energized, the clapper is attracted by the iron core and the needle wire is driven toward

the platen. (2) This needle wire hits the platen via the ink ribbon and paper. A single dot is printed on the paper. (3) When the print solenoid is de-energized, the needle wire is returned to its original position by rebound energy and

spring and clapper holder (leaf spring) force.

Paper

Platen

Spring

Paper guide

Ink ribbon

Clapper holder

Stopper

Clapper

Needle wire

Print solenoid

Guide

Subguide

Iron core

Fig. 2-4 Outline of Print Head Mechanism

– 24 –

THEORY OF OPERATION

4-2. Print Head Carrying Mechanism

The print head carrying mechanism consists of a carriage, timing belt, carriage motor, and home position detector.

Carriage

The carriage is supported horizontally by the carriage stay and rear angle. The carriage moves from side to side with

the print head mounted above it. A timing belt is clamped to the base of the carriage and a shield plate is mounted

at the base for home position detection.

Timing Belt

The timing belt is suspended between the timing pulley of the carriage motor and the timing pulley of the tension

lever. The timing belt maintains a constant tension.

The timing belt is also clamped to the base of the carriage so that it can move the carriage accurately with driving

force from the carriage motor.

Carriage Motor

The carriage motor is a PM (permanent magnet) 4-phase, 48-pole pulse motor driven by pulse signals from the

control circuit. The rotational rate depends on the number of pulses per unit time. By varying this rotational rate

(carriage carrying rate), the size of the horizontal letters can be changed in each print mode.

Fig. 2-5 Print Head Carrying Mechanism

– 25 –

THEORY OF OPERATION

4-3. Ink ribbon feed mechanism

The ink ribbon feed mechanism is linked to the print head carrying mechanism so the ink ribbon always winds automatically in the same direction while the carriage moves left and right. The movement of the carriage along the serrated edge of the rear angle of the printer mechanism drives the idler gear. The rotation of the idler gear is conveyed sequentially to the gears that work and wind the ribbon. The carriage has a clutch lever that keeps the direction of the cassette gear rotation constant, regardless of the direction of the idler gear rotation as the carriage moves left and right.

Fig. 2-6 Ribbon feed mechanism

– 26 –

+ 92 hidden pages

Epson LC4511TM, LC-4521 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

NOTICE

INTRODUCTION

1. General Specifications

2. External Appearance and Composition

3. Control Panel

3-1. Switch Combination Functions

3-2. EDS Mode Settings

4. Parallel Interface

4-1. General Specifications

4-2. Connector Signals

5. Serial Interface (optional)

5-1. General Specifications

5-2. Connector Signal and Functional Descriptions (SPC-8K, IS-8H192)

5-3. DIP Switch Settings (SPC-8K, IS-8H192)

6. EE-PROM mode

6-1. Outline

6-2. Explanation of special control codes

6-3. EE-PROM MAP

6-4. Rewriting the EE-PROM

1. Block Diagram

2. General Flow Chart (Main Logic Board)

3. Power Supply Circuit

4. Mechanism

4-1. Print Head Mechanism

4-2. Print Head Carrying Mechanism

4-3. Ink ribbon feed mechanism