Epson LX-800 Service manual

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Page 1

LX-HOO

TECHNICAL MANUAL

—

.—

EPSON

Page 2

EPSON is a registered trademark of SEIKO EPSON CORPORATION. IBM is a registered trademark of International Business Machines Corporation.

NOTICE

whatsoever without SEIKO EPSON’s express, written 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.

However, should any errors be detected, SEIKO EPSON would greatly appreciate being informed of them.

● The above notwithstanding, SEIKO EPSON can assume no responsibility for any

errors in this manual or their consequences.

Nagano, Japan

-i-

Page 3

REV.-A

PRECAUTIONS

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

to equipment.

DANGER

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.

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.

DANGER

1. ALWAYS DISCONNECT THE PRODUCT FROM BOTH THE POWER SOURCE AND THE HOST COMPUTER BEFORE PERFORMING ANY MAINTENANCE OR REPAIR PROCEDURE.

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-CERTl- FIED REPAIR TECHNICIAN.

2. MAKE CERTAIN THAT THE SOURCE VOLTAGE 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 THE AVAILABLE POWER

SOURCE, DO NOT CONNECT IT TO THE POWER SOURCE.

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

/.LP

4. IN ORDER TO PROTECT SENSITIVE

DISCHARGE EQUIPMENT, SUCH AS ANTI-STATIC WRIST STRAPS, WHEN ACCESSING INTERNAL COMPONENTS.

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

CHIPS AND CIRCUITRY, USE STATIC

- ii -

Page 4

PREFACE

This manual describes functions, theory of electrical and mechanical operations, maintenance, and repair of the LX-800. The instructions and procedures included in this document are intended for the experienced repair technician, who should pay attention to the precautions on the preceding page. The chapters are organized as follows:

REV.-A

—

Chapter 1 —

Chapter 2 —

Chapter 3 —

Chapter 4 —

Chapter 5 —

Chapter 6 —

Provides a general product overview, lists specifications, and illustrates the main components of the printer

Describes the theory of printer operation

Discusses the options

Includes a step-by-step guide for product disassembly, assembly, and adjustment

Provides Epson-approved techniques for troubleshooting

Describes preventive maintenance techniques and lists lubricants and adhesives required to service the equipment

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

iv -

Page 5

REVISION SHEET

REVISION I DATE ISSUED

CHANGE DOCUMENT

1st

issue

1-1, 5, 8, 12 through 18 2-2,11, 13,28,30,38 through 42 4-1, 13, 17, 19 5-1, 2, 6 6-1

A-2, 17, 18

-v-

Page 6

REV.-A

CHAPTER CHAPTER 2. OPERATING PRINCIPLES CHAPTER 3. OPTIONAL EQUIPMENT CHAPTER 4. CHAPTER 5. CHAPTER 6. MAINTENANCE

APPENDIX

GENERAL DESCRIPTION

DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT

TROUBLESHOOTING

vi -

Page 7

CHAPTER 1

GENERAL DESCRIPTION

REV.-A

—. —

FEATURES

1.1

1.2

INTERFACE SPECIFICATIONS

1.3 OPERATING CONTROLS

1.4

1.4.1

1.4.2

1.4.3

1.4.4

1.4.5

1.4.6

MAIN COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.5

1.5.1

1.5.2

1.5.3

1.5.4

1.5.5

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

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

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

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

Dip Switch and Jumper Settings

Control Panel (and Auto Sheet Load Function) . . . . . . . . . . . . . . . . 1-14

Self Test and Hexadecimal Dump Functions . . . . . . . . . . . . . . . . . . . . 1-15

SeiecType

Buzzer and Error Functions Printer Initialization and Default Values

Printer Mechanism ROC Filter Unit ROCX Board Unit

LCPNL Board Unit Housing

Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

Model-3A10

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

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

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

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

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

—.

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

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

1-1 1-3 1-6 1-12 1-12

. 1-16

1-17 1-17

. 1-18

1-18 1-19 1-20 1-20 1-21

Fig. 1-1. Fig. 1-2. Fig. 1-3. Fig. 1-4. Fig. 1-5. Fig. 1-6. Fig. 1-7. Fig. 1-8. Fig. 1-9. Fig. 1-10. Fig. 1-11.

LIST OF FIGURES

Exterior View of Exterior View of

Data Transmission Timing of 8-Bit Parallel Interface.... 1-3

57-30360 36-Pin Connector Printhead Pin Configuration Printable Area for Cut Sheet Paper Printable Area for Roll Paper Printable Area for Fan Fold Paper Control Panel

SelecType Flow Chart Mode13Al O Printer Mechanism

LX-800

LX-800 with Tractor Unit. . . . . . . . . . . . . . . . . . . . . . . 1-2

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

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

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

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

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

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

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

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

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

l-i

1-1

1-3 1-6 1-9 1-9

1-1o

1-14 1-16

1-18

Page 8

REV.-A

Fig. 1-12. ROC Filter Unit Fig. 1-13. Fig. 1-14. ROCX Board Unit Fig. 1-15. Fig. 1-16. Housing

ROC Filter Unit

LCPNL Board Unit

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

(120V (220V/240V

LIST OF TABLES

Version)

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

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

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

Versions)

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

1-19 1-20 1-20 1-20 1-21

Table 1-1. LX-800 Options

Table 1-2. Connector Pin Assignments and Signal Functions . . . . . . . . 1-4

Table 1-3. Printer Select/Deselect

Table 1-4. Printer Speed, Character Size, and Column Width . . . . . . . . 1-7

Table 1-5. Type of Paper Table 1-6. DIP Switch Settings Table 1-7. International Character Set Table 1-8. DIP Switches Factory Settings Table 1-9. Jumper Setting

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

(DC1/DC3)

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

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

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

Control . . . . . . . . . . . . . . . . . . . . . 1-5

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

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

1-2

1-8 1-12 1-13 1-13 1-13

Iii

Page 9

REV.-B

1.1 FEATURES

The LX-800 is a multifunctional and high speed serial dot impact printer with a compact body and the

low price.

Features include:

●

180

cps

maximum speed (draft-elite), 150

●

Upward compatibility with the LX-86

NLQ

●

Built in two

●

Direct selection of

●

Built in IBM graphics characters

●

Super/Subscript, Italics, and Elite modes can be supported in Automatic sheet loading function

●

3K-byte

●

Pull tractor feeding

●

Optional interface for the EPSON #81 XX series

input buffer for improved throughput from the host computer

fonts (Roman and Saris-serif)

NLQ/Draft modes, and easy selection of 4

cps

(draft-pica)

typestyle

NLQ

modes with

SelecType

controls

Tw=models

of the LX-800 are manufactured. The model for

t~e U.S

and Australia uses printer cover A and the model for all countries except the U.S. and Australia uses printer cover B. Figures 1-1 and 1-2 show the external view of the LX-800. Table 1-1 lists the options.

(Printer cover A)

(Printer cover B)

Fig. 1-1. Exterior

View of LX-800

1-1

Page 10

REV.-A

(Printer Cover A)

Fig. 1-2. Exterior View

Option No.

#83 10 #81 33 #8 143 #8 145 #81 48 #8 165

(Printer Cover B)

LX-800 with Tractor Unit

Table 1-1. LX-800 Options

Description

Roll Paper Holder APPLE II Intelligent Interface New Serial Interface RS-232C/Current Loop Type 2 InterFace Intelligent Serial Interface Intelligent IEEE-488 Interface

1-2

Page 11

REV.-A

1.2 INTERFACE

The LX-800 has a 8-bit parallel interface as a standard. The specifications for the 8-bit parallel interface

are as follows:

Data Format: Synchronization:

Hand Shaking: Logic Level: Data transmission Connector:

timing:

8-bit parallel By STROBE pulse By both

ITL

ACKNLG

(LS type) compatible

See Figure 1-3.

57-30360 (AMPHENOL) or equivalent (See Figure 1-4.)

BUSY

ACKNLG

OATA

STROBE

0.5JAS

min.

0.5JAS

min. min.

O..sus

NOTE: Transmission time (rising and falling time)

Fig. 1-3. Data Transmission Timing

and BUSY, or either of them

“w

of every input signal must be less than

for 8-Bit Parallel Interface

0.2Ks.

1. 19.

20.

6. 24.

9. 27. 10

13 31.

14 32.

15 33. GNO 16 17

GNO

22. GNO

23.

GNO

25.

GNO

26. GNO (

GNO ( Pair

2S.

GNO (

29. GND ( Pair

30. GNO ( Pair

m m

34. NC

35.

+5V

36.

Fig.1-4. 57-30360 36-Pin Connector

GNO

( Pair with 1.)

( Pair w;tn2.)

( Pair w;th3.)

( Pair wnh4.)

( Pair

( Pair w;th6.) ( Pair witn7.)

Pair w;th

Pair w:th

w;tn5.)

w;tn9.)

with

witn

S.)

10.)

11. )

12.)

1-3

Page 12

REV.-A

Table 1-2 shows the connector pin assignments and signal functions of the 8-bit parallel interface.

Table 1-2. Connector Pin Assignments and Signal Functions

~in

No.

2 3 4 5 6 7 8 9

11 12

15 16 17 18

9 to 30

Signal Name

STROBE

DATA 1

DATA2 DATA3 DATA4 DATA5 DATA6 DATA7 DATA8

ACKNLG

BUSY

SLCT

AUTOFEED-XT

—

GND

Chassis

GND

—

GND

Return Pin No.

21 22 23 24 25 26 27

—

— — — — — — —

— —

DIR

In In In In In In In

out

—

Functional Description

Strobe pulse to read the input data. Pulse width

be more than

must

falling edge of this signal. Parallel input data to the printer.

“HIGH” level means data “ 1“. “LOW” level means data “O”.

This pulse indicates data are received and the

printer is ready to accept next data. Pulse width is approx. 12

HIGH indicates printer can not accept next data.

0.51Js.

Input data is latched after

KS.

HIGH indicates paper-out. This signal is effective

only when

Always

3.3 K ohms register.) If the signal is “LOW” when the printer is initialized,

a line feed is automatically performed by input of “CR” code. (Auto LF)

Not used. Ground for twisted-pair grounding. Chassis ground level of printer Not used. Ground for twisted-pair grounding.

ERROR

signal is

“LOW”.

“HIGH” output. (Pulled up to

+5V

through

33 34 35

I NIT

ERROR

GND

— —

SLCT-IN

—

— — —

—

out

. —

out

1-4

Pulse (width: printer initialization.

LOW indicates that some error has occurred in the printer.

Ground for twisted-pair grounding Not used.

Always “HIGH”. (Pulled up to

3.3k-ohm register.) If the signal is “LOW” when printer is initialized, the

DC l/DC3 control is disabled.

50MS

min., active “LOW”) input for

+5V

through a

Page 13

REV.-B

NOTES 1. “Return” denotes a twisted pair return line connected to

2. All interface conditions are based on TTL levels. Both the rise and fall times of all signals

3. Refer to the Parallel Interface Timing Chart for the timing of the signals.

4. Data transfer protocol must not ignore the

5. The AUTO FEED XT and

6. Printing tests, including those of the interface circuits, can be performed without using

7. The PE signal is valid when the ERROR signal is LOW.

—

SLCT

IN Signal State

at Initialization

HIGH

the printer to the host, use twisted pairs for each signal. the shield to GND in order to reduce interface.

must be less than

either after recognizing the

the DIP switch or jumper.

external equipment: set interface connector data lines 1-8 to the desired code (a floating signal will be a logical 1, and a grounded signal will be a O) connect the to the STROBE signal.

Table 1-3. Printer Select/Deselect

0.2Ks.

Dcl/Dc3

DC 1

DC3

ACKNLG

SLCT

IN signals are valid when they are not fixed to LOW level by

signal or when the BUSY signal is LOW.)

(DC—1/DC3)

Printer

Select/Deselect

Select

Deselect

Shield

or BUSY signal. (Data can be transferred

Enable

Enable (Waits for a DC1. Input data is ig-

nored until a DC 1 code is received.)

signal

ground. When interfacing

the twisted pairs, and connect

ACKNLG

Control

Data entry

signal

LOW

DC1 DC3 Select

Select

Enable Enable

1-5

Page 14

REV.-A

1.3 SPECIFICATIONS

This chapter describes the specifications of the LX-800 printer.

●

General Specifications Printing method: Pin configuration: Pin diameter: Dot Pinch:

Serial impact dot matrix 9 wires (see Figure 1-5)

0.29 mm

0.35 mm (1/72 inch)

(

)

(

)

( )

0.29mm

0.35mm (1 /72”)

Printing direction:

Text mode:

Bit-image mode:

Dot matrix:

Character sets:

Fonts: Printing speed: Character size: Column width:

Fig. 1-5. Printhead Pin Configuration

Bi-directional with logic seeking Uni-directional (left to right)

9 X 9 (Draft)

11 X 18

6 X 8 (Graphics) 96 ASCII characters 96 Italic characters 32 International characters 32 International Italic characters 32 Graphics characters 96 IBM Graphics characters Draft, See Table 1-4 See Table 1-4 See Table 1-4 480 dots/line at 60 dots/inch (Bit-image)

(NQL)

NLQ-Roman,

Saris-serif

—.—

1-6

Page 15

Font

Draft

(Pica)

Draft

(Elite)

NLQ

Super-

sub-

script

...—

Type Style

Normal

0 —

— .

— —

o —

— —

o —

0 —

Table 1-4. Printing Speed, Character Size, and Column Width

Double

Width

—

Empha-

sized densed

Con-

— — — —

0 —

—

— — — — —

—

— —

o o 64

Printing Speed (CPS)

150

75 75

128

180

150

Charecter

Width

Size (mm)

Height

2.1

4.2

2.1

4.2 3.1 40

1.05

2.1

4.2 3.1 48

1.05

3.1 80 10

3.1

3.1 66

3.1

1.6

Column Width

(maximum

cters/LinsCPL)

40 80

132

160

Chara-

Pitch

(meximum

Characters

/inch-CPl)

8.5 12

REV.-A

Line spacing: 1/6” or Programmable (n/2 16“) Line feed speed:

(1 line = 1/6”)

Approx. 95ms/line Approx. 75ms/line

(Line feed)

(Form feed)

Paper feed method: Friction feed or Tractor feed

Paper path: From rear of printer

● Paper Specifications

Type of paper:

See Table 1-5

1-7

Page 16

REV.-B

Table 1-5. Type of Paper

Size

Thickness

Copies

Weight

Cut sheet

(Width)

182 mm to 216 mm

7. 15“ to 8.5”

Fan-fold paper

(Width)

101 mm to 254 mm

4“ to 10”

(Length)

Max. 305 mm Max. 12“

0.06 mm to 0.1 mm

Max. 0.25 mm

1 original +2

52g/m2 to 82g/m2 (1 sheet)

52g/m2 to 82g/m2

(2 sheets)

35g/m2 to 58g/m2

(3 sheets)

35g/m2 to 58g/m2

for 2 sheets

35g/m2 to 47g/m2

for 1 sheet

Roll paper

(Width)

& 3 mm

216

8.5” & 0.12“

(Diameter of roll)

Max. 127 mm Max. 5“

0.07 mm to 0.09 mm

52g/m2 to 64g/m

Feeding method Friction feed Precautions

1. Do not use continuous form or copy paper.

2. Dismount the Tractor unit.

Tractor feed Friction feed

1. Release the friction 1. Use the Roll paper mechanism using the

holder.

release lever. 2. Dismount the Tractor

2. Use the pressure

sen-

unit. sitive paper for copying. Be sure that per-

forations have a smooth finsh.

1-8

Page 17

REV.-A

Printable area:

—

See Figures 1-6 through 1-8

7.1 5“ - 8.50/182 mm -

0.1 2“, 3 or more

0.87”, :

2“”,

305 mm

.2’.

,3(

mor

I-

ABC

t a b

r e

216 mm

Printable area

.—

XYZ

0.1 2“, 3 mm

=more

0.1

2“/3 mm–

or more

0.98”/25 mm or more

Fig. 1-6. Printable Area for Cut Sheet Paper

8.5”, 216 mm

Printable area

ABC

XYZ

●

‘or

0.1 more

2“/3

Fig. 1-7. Printable Area for Roll Paper

1-9

Page 18

REV.-A

4“ -

10 ”/101 mm - 254 mm

Printable area

0.35 ”/9 mm or more

0.35 ”/9 or more

Printabh

area

Printable area

0 0

0 0 0

0 ABC

0 0

-----------

0 0 0

------

o ABC

0 0 0 0 0

0.75”/19

1.02”)26 mm

0.75”/19

0.94”/24 mm (Paper width is more than 9.5 ”/241 mm)

[PaDer

width is less than 9.5”/241 mm)

~Paper

width is more than 9.5 ”/241 mm)

mm (Paper width is less than 9.5 ”/241 mm)

XYZ

----

XYZ :

0 0

o 0 0 0 0

0 0 0 0 0 0 0

Ribbon Cartridge Cartridge number:

Color:

Life:

Electrical Specifications Power Voltage:

Frequency range:

Power consumption: Insulating resistance:

Dielectric strength:

Fig. 1-8. Printable Area for Fan Fold Paper

#8750

Black

3 million characters (14 dots/character)

120VAC

220/240VAC *

59.5Hz

49.5Hz to

Max.

70VA

10%

to 60.5Hz (120VAC)

60.5Hz

(220/240VAC)

More than 10M ohms

(between the AC line and chassis)

KVAC

rms/minute or 1.2KVAC rms/second

between AC line and chassis (120V)

kVAC

1.25

rms/minute or 1.5

between AC line and chassis

kVAC

rms/second

(220/240V)

1-1o

Page 19

● Environmental Specifications

Temperature:

Humidity:

Resistance to shock:

Resistance to vibration:

● Reliability

MCBF: MTBF: Life of

● Safety Approvals

. safety Standards:

RFI:

printhead:

–30”C

5°C to 5% to 85%RH, no condensation (Storage)

10% to

2G, 1 ms (Storage)

IG, 1 ms (Operating)

0.50G,

0.25G, max

3 million lines (Printer mechanism except the 4000 hours 200 million strokes/needle

UL 478 (U. S.A.) CSA 22.2 No. 0.154 (Canada)

VDE

FCC class B (U. S.A.)

VDE 0871 (West Germany)

to 60 ”C/–22°F to 149°F (Storage)

35”C/4

max. 55Hz (Storage)

0806 (West Germany)

1“F to 95°F (Operating)

80%RH, no condensation (Operating)

55Hz (Operating)

—

REV.-A

printhead)

● Physical

Dimensions: (Refer to Figure A-19)

Weight:

91 mm (height)

377 mm (width)

399 mm (width including paper feed knob)

308 mm (depth)

5.1 kg

1-11

Page 20

REV.-B

1.4 OPERATING CONTROLS

This section describes the operating controls of LX-800 printer.

1.4.1

DIP Switch and Jumper Settings

The DIP switches that users can set are SW1 and SW2. These switches are positioned at the rear center of the printer and have the functions shown in Tables 1-6 through switches is read only when at power on or at input of the INIT signal).

Table 1-6. DIP Switch Settings

1-8. (Note: the status of the DIP

DIP SW

1-1 1-2

1-3

1-4 I

1-5 I Printing quality select 1-6

1-7

1-8 2-1 2-2 Cut sheet feeder mode 2-3 1“ skip over perforation Valid 2-4 AUTO FEED XT control

Typeface select

ZERO font select

Character Table select

Paper-out detection

International character set select

Page length select

Function ON OFF

Condensed

I I

Fix to LOW

Graphic

Valid

NLQ

12“

Valid

I I

See Table 1-7

Depends on ex-

ternal signal

Normal

Italic

invalid

Draft

1 1“ Invalid Invalid

1-12

Page 21

Table 1-7. International Character Set

Country

SW 1-6 Sw 1-7

REV.-B

SW 1-8

Country

U.S.A. FRANCE ON

GERMANY U.K. DENMARK

SWEDEN

ITALY

SPAIN

DIP SW No.

ON OFF OFF

OFF OFF

Table 1-8. DIP Switches Factory Settings

1-1

1-2

1-3

1-4 1-5

ON ON

OFF

ON ON

OFF

1-6

1-7

OFF

1-8

2-1

2-2 2-3 2-4

U. S.A., Southeast Asia,

Middle and

Germany, Northern Europe

U. K., Australia France, Italy, Spain

Jumper J 1 on the ROCX board has the function and factory setting shown in Table 1-9.

Jumper

Near East

Function

SLCT IN control

OFF OFF OFF OFF OFF ON

OFF OFF

OFF OFF OFF OFF ON OFF OFF ON

Depends on external signal Fix to LOW

OFF

OFF OFF ON

OFF

OFF OFF ON

Table 1-9. Jumper Setting

Open Close Factory setting

ON ON OFF OFF

OFF ON ON OFF

OFF OFF OFF OFF OFF

ON ON OFF OFF

OFF OFF

OFF

OFF OFF

Open

1-13

Page 22

REV.-B

1.4.2 Control Panel (and Auto Sheet Load Function)

Figure 1-9 shows the control panel of LX-800 printer.

Fig. 1-9. Control Panel

The functions of the LEDs and switches are:

POWER LED (green)

Lights when the power switch is turned on and AC power is applied. READY LED (green)

Lights when the printer is ready to receive data. PAPER OUT LED (red)

Lights when the printer runs out of paper. ON LINE LED (green)

Lights when the printer is ON-LINE. ON/OFF LINE Switch (non-locking push switch)

Switches between the ON-LINE and OFF-LINE modes. The printer is automatically set ON-LINE and becomes ready when power is turned on. If the printer is set OFF-LINE, printing is stopped and the printer enters the busy state.

NLQ/FORM FEED Switch (non-locking push switch)

●

When this switch is pressed once in the OFF-LINE mode, the paper is advanced vertically to the top of form on the next page.

●

When this switch is pressed in the ON-LINE mode, the

NLQ-Roman

NLQ-Sans-serif

fonts are

selected, and the buzzer sounds to inform the user which font is selected.

NLQ-Roman: NLQ-Sans-serif:

Two beeps Three beeps

1-14

Page 23

g. DRAFT/LINE FEED and AUTO LOAD Switch (non-locking push switch)

●

When this switch is pressed once in the OFF-LINE mode, the paper is advanced vertically one line, and the paper advanced continuously while this switch is pressed. When this switch is pressed in the ON-LINE mode, the Draft font is selected, and beeps once a

●

buzzer to inform the Draft font is selected. Cut sheets are automatically loaded when the paper is placed at the sheet guide, printer is paper

●

out, OFF-LINE state and the this switch is pressed.

1.4.3 Self Test and Hexadecimal Dump Functions

The conditions of LX-800 may be checked via the self test functions. The self test checked:

● Circuit

● Printer mechanism

● Printing quality

● ROM (firmware) code number

The code number of ROM is printed on the first line of the self test.

start

DRAFT/LINE FEED or

the self test in either the Draft mode or

NLQ/FORM FEED switch, respectively. In the

and Saris-serif font are printed every other line. When the DIP switch 1-5 set to on

NLQ

mode self test is performed, no related switches. To stop the self test, turn the power off by power

NLQ

mode,+urn the power on while pressing the

NLQ

self test mode, both Roman font

(NLQ

mode), only

switch.

REV.-B

The conditions of data transmission between LX-800 and the host computer may be

checkedvia

hexadecimal dump functions. To set the hexadecimal dump mode, turn the power while pressing

the the

both LINE FEED and FORM FEED switches. Then the message “Data Dump Mode” is printed.

The printer prints 16 hexadecimal values, followed by the corresponding ASCII characters. If there is no corresponding printable characters for a value (e.g. a control code), a period (.) is printed. One line is printed for each set of 16 values received, and any remaining data (less than 16 values) can be printed by pushing the ON/OFF LINE switch.

To cancel the hexadecimal dump mode, turn the power off by power switch.

1-15

Page 24

REV.-B

1.4.4

SelecType is a feature of the LX-800 which permits type style programming via the control panel

switches without software assistance.

In the

Figure 1-10 shows the operation flow chart of

SelecType

SelecType mode,

● Emphasized

● Double-strike

● Condensed

● Elite

Function

following 4 type styles can be selected:

SelecType function:

< ENTER >

Hold down ON/OFF LINE SW, and press

NLQ/FORM

er beeps once and ON-LINE LED starts blinking.)

FEED SW. (Print-

Press ON\OFF LINE SW the number of times indicated below for the mode. (Pay attention to the number of beeps the printer makes when the buzzer sounds.)

Emphasized 3 Condensed

2 I Double-striked

Select the type style >

Set type style >

Press FORM FEED SW.

< EXIT >

Press LINE FEED SW.

4 I Elite

OFF-LINE

Fig. 1-10. SelecType Flow Chart

1-16

Page 25

1.4.5 Buzzer and Error Functions

The buzzer rings under the following circumstances:

●

When a BEL code is sent to the printer, the buzzer

rings once (for 0.1 sec.).

●

When the

rings twice (for 0.1 sec. each, with 0.1 sec. pause between rings).

When the

●

rings three times (for O. 1 sec. each, with O. 1 sec. pause between rings).

●

When the Draft font is set using the DRAFT/LINE FEED switch, the buzzer

rings once (for O. 1 sec.).

●

When the printer enters the

rings once (for O.

When paper out is detected, the buzzer

●

rings eight times (for 0.5 sec. each, with 0.5 sec. pause between rings). When abnormal carriage operation is detected (hardware error), the buzzer

●

rings five times (for 0.5 sec. each, with 0.5 sec. pause between rings).

●

✍

-W—hen abnormal voltage is detected (hardware error), the buzzer rings five times (for 0.5 sec. each, with 0.5 sec. pause between rings).

NLQ

Roman font is set using the FORM FEED switch, the buzzer

NLQ

Saris serif font is set using the NLQ/FORM FEED switch, the buzzer

SelecType mode, the buzzer

sec.).

.—

REV.-B

When the paper end sensor detects paper out, the state of the interface changes as follows:

ERROR signal BUSY signal

signal+

The printer enters an error state when any of the following occurs:

a. Home position is not detected after the printer mechanism has been initialized (home

seek).

b. The

When the printer enters an error state, the printer stops the printing, and the state of the interface changes as follows:

1.4.6 Printer Initialization and Default Values

The LX-800 initialized when any of the following occurs.

●

When

b. c. d. e. f.

9“ i.

+24V

ERROR signal BUSY signal

The power switch is turned on.

Intetiace signal INIT goes low.

the printer is initialized, the following operations are performed:

Seek to carriage home position. Set to ON-LINE mode. Clear the all buffers. Set the line spacing to 1/6 inches. Set the page length to 11 or 12 inches, according to the DIP switch. Clear all vertical tab positions. Set the horizontal tab position to every 8 columns. Set the print mode according to the DIP switches.

LOW

HIGH

voltage (which is used to drive the printhead and motors) rises to

LOW

HIGH

+27V

position

or more.

1-17

Page 26

REV.-B

1.5 MAIN COMPONENTS

The LX-800 consists of the following components:

● Printer Mechanism

● ROC Filter Unit

● ROCX Board Unit

LCPNL

●

● Housing

Board Unit

Model-3A10 (include the Tractor Unit)

1.5.1 Printer Mechanism

The Model-3A10 printer mechanism was developed expressly for use with LX-800 printer: the components include a carriage motor, carriage mechanism, paper feed motor, paper feed mechanism, ribbon feed mechanism, printhead, sensors, and the tractor unit. For the tractor unit, there are two tabs on both side frames to allow the printer cover to float slightly when tractor feeding is performed.

Model-3A10

Fig. 1-11.

Model-3A10

1-18

Printer Mechanism

Page 27

REV.-A

1.5.2

The ROC filter unit contains a power cord ( 120 V version) or AC inlet (220/240 V version), power switch,

ROC

Filter Unit

fuse, filter circuit, and power transformer.

..—

Fig. 1-12. ROC Filter Unit (120V version)

Fig. 1-13.

ROC Filter Unit (220

V/240V

versions)

1-19

Page 28

REV.-A

1.5.3

The

ICS

on the

ROCX

Board Unit

board contains the main control circuit, driver circuit, and voltage regulator circuit. The main

ROCX

boards are the pPD78 10HG CPU and the E05A03 gate array which controls everything.

\----=--/.

1.5.4

LCPNL

The

buzzer.

Fig. 1-14. ROCX Board Unit

LCPNL

Board Unit

board unit is a control panel of LX-800 which contains the indicator

LEDs,

switches and

Fig. 1-15. LCPNL Board Unit

1-20

Page 29

REV.-A

1.5.5 Housing

The housing is comprised of the upper and lower cases, and paper feed knob, which accommodate the printer mechanism, ROCX board unit,

LCPNL

board unit, and ROC filter unit.

Fig. 1-16. Housing

1-21

Page 30

CHAPTER 2

OPERATING PRINCIPLES

REV.-A

GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1

CABLE CON NECTIONS....... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 POWER SUPPLY CIRCUIT

2.3

2.3.1 ROC Filter Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3.1.1 Fuse and Filter Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3.1.2 Power Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3.2 Regulator Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3.2.1 Operation Principles of Chopper Type Switching

+24V

2.3.2.2

2.3.2.3

+5V

CONTROL

2.4

2.4.1 Functions of the CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.4.2 E05A03 Gate Array Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.4.3 Data Flow

CIRCUIT........

2.4.3.1 Initialization

2.4.3.2 Print Data Processing

Supply Circuit

Supply Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

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

Regulator...............................................2.6

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

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

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

2-1

2-3

. 2-3

2-4

2-5

2-7

2-8

2-9

2-11

2-14 2-18 2-19 2-20

2.4.4 Reset Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.4.5 Carriage Motor

2.4.5.1 Home Position Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.4.5.2 Carriage Motor Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.4.5.3 Home Position Seek. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.4.5.4 Carriage Motor Drive Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27

2.4.6 Paper Feed Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.4.6.1

2.4.6.3

2.4.6.4

2.4.7 Printhead

2.4.7.1

2.4.7.2

2.4.7.3

Paper End Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Paper Feed Motor Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Auto Loading Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Paper Feed Motor Drive Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31

Printhead Control

Printhead Drive Pulse Width Control Circuit . . . . . . . . . 2-33

Printhead Drive Circuit

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

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

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

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

2-22

2-23

2-24

2-26

2-27

2-29

2-30

2-32 2-32

2-34

Z.i

Page 31

REV.-A

2.4.8 Print Timing Control

2.4.8.1 Print Timing Control for the Carriage and Printhead

2.4.8.2 Bidirectional Logic Seeking

PRINTER MECHANISM OPERATION

2.5

2.5.1 Sensor Mechanism

2.5.2 Carriage Mechanism

2.5.3 Paper Feed Operation

2.5.3.1 Friction Feed Operation

2.5.3.2 Sprocket Feed Operation

2.5.4 Ribbon Feed Mechanism

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

LIST OF FIGURES

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

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

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

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

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

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

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

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

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

2-34

2-34 2-35 2-37 2-37 2-38 240 240 2-40 242

Fig.

2-1. Cable Connections

Fig.

2-2. Power Supply Circuit Block Diagram 2-3. Filter Circuit

Fig.

24. Power Transformer

Fig. Fig. 2-5.

Fig. 2-6. Chopper Switching Regulator Circuit Fig. 2-7 Voltage Waveforms Fig. 2-8 Fig. 2-9 Fig. 2-10

Fig. 2-11. Fig. 2-12. Fig. 2-13. Fig. 2-14. Fig. 2-15. Fig. 2-16.

+24V/+5V

+ 12V Half-Wave Rectifier Circuits

+24V

Supply Circuit

IC494

Block Diagram and Switching Waveform . . . . . . . . . . . . . 2-7

+5V

Supply Circuit Control Cirucit Block Diagram E05A03 Block Diagram LX-800 Memory Map Initialization Flow Print Data Flow Line Buffer

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

DC Regulator and

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

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

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

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

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

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

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

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

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

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

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

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

2-2

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

2-3 24 24

2-5 2-6 2-6 2-7

2-8 2-10 2-14 2-18 2-19 2-20

2-21 Fig. 2-17. Fig. 2-18. Fig. 2-19. Fig. 2-20.

Fig. 2-21.

Fig. 2-22. Fig. 2-23.

Reset Circuit Home Position Sensor Circuit Basic Phase Switching Patterns Basic Operation Sequence Home Position Seek Operation Flow Carriage Motor Drive Circuit Paper End Sensor Circuit

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

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

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

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

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

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

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

2-ii

2-22

2-23

2-24

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

2-26

2-27

2-28

Page 32

REV.-A

Fig. 2-24. Paper End Detection Area Fig. 2-25. Phase Switching Basic Pattern

Fig. 2-26. Basic Operation Sequence ...................

Fig. 2-27. Printing Start Position Fig. 2-28. Paper Feed Motor Drive Circuit Fig. 2-29. Fig. 2-30. Fig. 2-31. Fig. 2-32. Fig. 2-33. Solenoid Current and Drive

Fig. 2-34. The Relationship Between the Carriage

Fig. 2-35. Logic Seeking Fig. 2-36. Printer Mechanism External View Fig. 2-37. Carriage Mechanism

Printhead Drive Pulse Pattern Printhead Drive Pulse Width Range

+24V

DC Monitor

Printhead Drive Circuit

Voltage Waveforms

and Control Signals

Circuit..................................................".."".

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

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

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

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

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

mm.m.o.m..mm........

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

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

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

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

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

(Model-3A10)

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

2-28 2-29

".".a".""""""..-

. . . . . . . . . . . . 2-37

2-29

2-30 2-31 2-32 2-33

2-33

2-34

2-35

2-36

2-38

Fig. 2-38. Fig. 2-39. Friction Feed Operation Fig. 2-40. Sprocket Feed Operation Fig. 2-41. Ribbon Feed Mechanism

Printhead

Printing Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-39

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

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

2-40 2-41 2-42

LIST OF TABLES

Table 2-1. Voltage Types and Applications Table 2-2. Power Transformer Output Voltages

Table 2-3. CPU Port Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 24. Table 2-5. Table 2-6. Ribbon Feed Gear Train

E05A03

Functions

Port Assignments

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

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

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

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

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

2-3 2-11

2-11

2-16 2-17 242

2-iii

Page 33

REV.-A

2.1 GENERAL

This chapter describes the component connections, specifications and operation of the power supply

circuit section, the software for the control circuit section, and the operation of the hardware and the printer mechanism. Please note that the following units are assumed when omitted in this chapter.

Resistor: Capacitor: Units are Farads.

The components listed below are referred to as follows:

ROCX board: Main board

LCPNL

Model-3Al O: Printer mechanism

—

board: Control panel

Units are Ohms.

.—

2-1

Page 34

REV.-B

2.2 CABLE CONNECTIONS

Figure 2-1 shows the interconnection of the primary components, with the main board at the center.

MODEL-3A1O PRINTER MECHANISM

g Vcn

ET=

‘f;OuOTjR

36pin

CN1

8-BIT

PARALLEL

l/F

PRINT HEAD

- -

CN4

12pin

-—1

CN5

12pin

ROCX

BOARD

(MAIN BOARD)

n z

#8100 SERIES

I l/F BOARD

A—-

PAPER

END

“~

‘z

‘~ z *

HOME

Posh

ROCK FILTER UNIT

AC120V

AC220V

AC240V

(POWER TRANSFORMER AND FILTER)

Ail

20V

AC220V AC240V

Fig. 2-1. Cable Connections

ROCX

The

CN2: CN3:

CN4:

CN5:

CN6: CN7: CN8:

The pin numbers and functions for each connector are listed in Tables A-8 through A-15 of the APPENDIX.

board connectors are as follows:

1 :

8-bit parallel interface connector. Used for data communication with the host computer.

Connector for the #8 100 series optional interface

Receives data from the LCPNL board switches, and outputs the signals to the LEDs and the

buzzer. Outputs data to the printhead. Outputs the control signals and drive voltages to the paper feed and carriage motors.

Receives the paper end signal from the printer mechanism.

Receives the home position signal from the printer mechanism. Receives AC voltages from the ROC filter unit.

2-2

Page 35

2.3 POWER SUPPLY CIRCUIT

REV.-A

This section describes the operation of the

ROC

filter unit

and regulator

Figure 2-2 shows the block diagram of the power supply circuit.

their applications.

_-_. ---------- —----

:AC1 ~

1AC2 I 1;

I :

— -t

Full-Wave

Rectifier and

Smoothing Circuit

circuit

Half-Wave

Rectifier

Circuit

Switching Regulator

IN i

—

---—-

i r-l

1 I I

-—-----——-

- -— -

Power

SwNch

ROC

------q

Filter

Circuit

Filter Unit

Power

Trans-

— -

I I

I k- —-. -------------------

ROCX

circuit on the

ROCX

board.

Table 2-1 shows output voltages and

-----

—

Switching

Regulator Circuit

I I

I ‘

+ 24VDC

O GP

5VOC

GND

—1

+ 12V

I I I

0 GND

12VAC

O 12VAC

Board

2.3.1

Fig. 2-2. Power Supply Circuit Block Diagram

Table 2-1. Voltage Types and Applications

Power Voltage

+ 24 VDC-GP

Printhead common voltage Paper feed motor drive voltage Carriage motor drive voltage Optional interface board

VDC-GND Logic circuit

Paper feed motor hold voltage

Carriage motor hold voltage

Control panel power

Optional interface board

+ 12VDC-GND Optional interface board

12V AC

Optional interface board

ROC Filter Unit

Application

ROC

The

filter unit consists of an AC power cord (or AC power inlet), power switch, fuse, filter circuit,

and power transformer. The AC power cord, AC power inlet, fuse, and power transformer differ

ROC

depending on the power supply voltage. Three kinds of

filter units, for 120 V, 220 V, and 240 V,

are available.

2-3

Page 36

REV.-A

2.3.1.1 Fuse and Filter Circuit

The AC input from the power line first flows across the power switch and fuse F1. After being filtered

by C 1 and circuit. Power line noise (external noise) and internal noise from the printer are eliminated by this circuit.

The value of fuse F1 changes as follows, according to the power supply voltage:

AC IN x2

C2, it is supplied to the primary side of the power transformer via the

V version: 125 V or 250 V, 1.25 A

120 220 V version: 250 V, 0.63A 240 V version: 250 V, 0.63A

Power Switch

r’;

2200PF

;

C2 = =

////

29~H

–

0.1

Power Transformer

L1/C3

@pin

noise prevention

Fig. 2-3. Filter Circuit

2.3.1.2 Power Transformer Three types of power transformers, for 240 V, 220 V, and 120 V, are available. The AC voltage from the filter circuit is transformed to the voltages listed in Table 2-2 so that they can be output to the

ROCX

regulator circuit (on the

TF1

and TF2.

a)~

primary

50/60Hz

side

TF1

board) at the next stage. The power transformer includes thermal fuses

Gii=El:

Secondary Side

To the

ROCX

Board

Fig. 2-4. Power Transformer

2-4

\..

Page 37

Type

Pin No.

Table 2-2. Power Transformer Output Voltages

Rated Voltage

No-load AC Voltage [V]

AC [V] DC [V]

REV.-A

220V 240V

120V

NOTE: Column “DC

board is connected. The plus and minus values between pins 10 and 9 are different due to the

voltage drop across thermal fuse TF2.

0-0 @-@ a-o

n-m

29.3

9.0

29.3

8.96

@/]”

for the rated voltages indicates the output of the transformer when the

27.1

8.33

27.7

8.41

32.3

+9.0/– 9.9

33.3

+9.27/– 10.0

ROCX

2.3.2 Regulator Circuit

AC-tind

regulator circuit can be divided mainly into two portions, the +24 V/+5 V and + 12 V lines. AC 1 is full-wave rectified by diode bridge DB 1 and converted to +24 V and +5 V via the chopper type switching regulator. interface board.

AC2 output from the ROC filter unit are input to connector CN8 of the

AC2 is half-wave rectified by D4-C 10, converted to + 12 V, and input to the optional

ROCX

board. The

Sc2

2M-3.ISA-MI Otal-3.1=1 KV

3.15A

cl-

●

C;t a

● WI

20v:

Fig. 2-5. +24/+5 VDC Regulator and +12 V Half-Wave Rectifier Circuits

04 2M01n3

1000,

Clo

13A)

pPc494c

az, &_

0747

*UK

‘~’i

R6S

O.in

2!3

r, r

“=*V

‘

**I

In,

.24V

2-5

Page 38

REV.-A

2.3.2.1 Operation Principles of Chopper Type Switching Regulator The operating principle of the switching regulator is illustrated in Figures 2-6 and 2-7.

:fl,~

“

Fig. 2-6 Chopper Switching Regulator Circuit

V/I

Max =

J+

Vi - VO

c =

to =

IPtD

+ IOt 1

.tc

- L

Fig. 2-7 Voltage Waveforms

When switching transistor St is on, current Is is supplied to inductor L in proportion to time;

,s =

(vi –LVo)

When energy has accumulated in the inductor L, current 10 is supplied to the load. When St is off, the energy accumulated in L causes

ID = Ip –

current ID to flow via diode D and to supply load current 10;

The longer the on-time of St, the more the output voltage increases, and the shorter the on-time of St, the more the output voltage decreases. Theoretically, electric power efficiency is assumed to be 100%;

Output voltage Vo =

2-6

Page 39

REV.-A

2.3.2.2 +24 V Supply Circuit

The +24 V supply circuit is a chopper type switching regulator circuit. Figure 2-8 shows the block diagram of the +24 V supply circuit based on Figure 2-6.

LP401 -02SD

+24VDC

~ ~ C26

2200jL\35V

ZBF503

-01 TA OGP

which are used as Darlington

(IC3A),

and

R50 2 4/0 5

Q25

C3747

AC1

DB1

D3SB1

125V

3.1

R67

o.47/3w

C22

6800

/-f

50V

(3A)

R49

330

R47

3.3K

494

R46

330

—

input from the ROC filter unit is full-wave rectified by DB 1 and is smoothed by C22. The voltage

AC 1

across amplifiers, D7, L2 and

C22 becomes 32.3 VDC. Transistors Q23, Q24, and

C26 in Figure 2-8 are equivalent to switching transistor St, flywheel diode D,

Fig. 2-8. +24 V Supply Circuit

Q25,

choke coil L, and smoothing capacitor C in Figure 2-6. Switching is controlled by the 494 pin 9 of the 494 is the emitter of the internal switching transistor. Therefore, switching is performed as follows:

494 internal transistor: ON 494 internal transistor: OFF

Q23: ON

Q23: OFF

Figure 2-9 shows a block diagram of

+323V

GND

494.

~. ---,

Q24: ON ~ Q25: ON

Q24: OFF

+24VDC

& IC

?!”5

Oscdat.r W,v.-fonll

Q IC 3A

Ptn9

1,, ”s!s,.,

W... -from

Q25 Ern,tw

W.v.-fom

1/6w

Q25: OFF

f :

(

1,11

[

(

[

( (

Fig. 2-9.

IC494

Block Diagram and Switching Wava-form

2-7

Page 40

REV.-A

When the printer power is turned on, ZD1 on the +20 VDC line turns on,

applied to

494. Then the oscillator

(OSC)

starts generating an approximately 20 kHz sawtooth

Q22

turns on, and Vcc is

waveform, which is regulated by R40 and C20, and the reference voltage generator outputs the +5

VDC & 10% reference voltage. Internal switching transistor Tr is switched on and off using the output

EA1

and

EA2

from error amplifiers 1 and 2.

limit voltage and current, respectively.

voltage obtained by dividing the +24 V applied to pin 1 by R22 and R21

EA2

V reference voltage applied to pin 2.

obtained by dividing the +24 V applied to pin 16 by R21

compares the voltage monitored by R66 with the voltage

(approx.

0.31 V). Therefore, the current is

(approx.

EA1

compares the

4.9 V) with the + 5

limited to approximately 3.1 [amps].

2.3.2.3 +5 V Supply Circuit The +5 V supply circuit is also a chopper type switching regulator, which is the same as the +24 V supply circuit.

Vvv

330

C9 470P

RI 4

2K SRI

( )

R13

78L05A

0 –=

0.1-C8

~P201

ERB81

–004

ZBF503

-=01

–2R5SD

1 Ov

GND

+24V

Q21

Q20

Al O

C3746

15(

R12

77)7-

Fig. 2-10. +5 V Supply Circuit

When +24 V is applied to this circuit, current flows via

SR1

includes a +5 V reference voltage generator and compares the voltage at terminal O (pin 2) with

the reference voltage. When this voltage is lower than the reference voltage,

1 ) on. If the voltage is higher than the reference voltage,

Q20

switching transistors

5.024 V (calculated value) because the

and Q21, and the output voltage is kept constant. Actual output voltage is

GND

terminal (pin 3) of SR 1 is raised to 0.024 V using the divider

R12 and R1 1, and operation of

1 turns terminal I (pin

1 turns the terminal off. This controls the

SR1

is started.

composed of R 14 and R 13.

2-8

Page 41

REV.-A

2.4 CONTROL CIRCUIT

This section describes the software operation, specifications, and circuit operation of the control circuit

(ROCX

1. Function of the CPU which controls the overall operation and its peripheral circuits (Section 2.4.1)

2. Gate array function (Section 2.4.2)

3. Outline of the overall firmware operation (Section 2.4.3)

4. Software control and circuit operation of the analog circuits (Sections 2.4.4 through 2.4.8) The control circuit is very simple, and consists mainly of four chips: the CPU, gate array, ROM, and RAM. (Refer to Figure 2-1 1.) The main operation of the control circuit is to control the CPU and the gate array.

Other components are described in each section that describes the functions of the CPU and gate array.

board). This section consists of the following descriptions:

Figure 2-11 shows a block diagram of the control circuit.

..—

2-9

Page 42

REV.-A

Ill

PESENSOR

PAPER MOTOR

FEEC

CARRIAGE MOTOR

HOME

PRINT HEAD

)mho

-–r

m-m

G.A. E05A03BA

mmoo

m-m

—

‘f”)

Fig. 2-11. Control Circuit

‘u’

HOST COMPUTER (OPTIONAL

Fig. 2-11. Control Circuit Block

2-1o

IIF

BOARD)

Diagram

Block Diagram

Page 43

2.4.1 Functions of the CPU

REV.-B

The core of the control circuit is the 78 10H CPU the related circuits.

Table 2-3. CPU Port Assignments

Number

Port

Assignment

PAO

1/0

Signal Line

Name

CRCOM

1/0

port. Switches the carriage motor drive voltage and the holding voltage. When this signal is HIGH (LOW), the drive voltage (holding voltage) is applied to the carriage motor.

2 3

‘-5

6 PA5

PA1 PA2

PA3

PA4

PA6

—

PFCOM

LF SW

PE SW 1/0 port. Reads the state of the paper end sensor. When no

—

Not used.

1/0 port. Switches the paper feed motor drive voltage and the

holding voltage. When this signal is HIGH (LOW), voltage (holding voltage) is applied to the paper feed motor.

1/0 port. Reads the state of the LINE FEED switch on the

control panel.

1/0 port. Reads the state of the FORM FEED switch on the

control panel.

paper is loaded, this signal goes LOW. Not used.

(IC2B).

Table 2-3 shows the function of each pin and

Description

the drive

16 17

8 9

PA7 PBO

PB7 Pco

Pcl

PC2

PC3

PC4

PC5

P/s

SW1 -8

Swl

- 1

TXD

RXD

ONLINE LP

ONLINE

ACKNLG

1/0 port. Reads the P/~ signal from the optional interface. 1/0 port. Reads the state of DIP SW1.

TXD output port. Outputs the data from the serial 1/0 channel

in the CPU to the terminal of the optional interface.

RXD

input port. Used as a receive control signal when the optional serial interface board (for serial/parallel data conversion) is connected. (Data reception detection)

1/0 port. Controls the ON LINE LED on the control panel. When

this signal is LOW, the LED lights. INT2 input port. Reads the state of the ON LINE switch on the

control panel. Connected to the interrupt controller in the CPU, which executes the ON LINE/OFF LINE switch interrupt routine when this signal is LOW.

1/0 port. Outputs an error signal to the interface board when

the printer is in an error state. When this signal is LOW, the printer is in an error state.

1/0 port. Outputs the acknowledge signal to the interface. This

signal is LOW active.

TXD (transmit data to the host computer)

PC6

PC7

FIRE

BUZZER

COO output port. Outputs the drive pulse width signal, which is determined by the timer/event counter in the CPU, to the FIRE

terminal of gate array E05A03. This

1/0 port. Outputs the buzzer signal to the control panel. When

this signal is LOW, the buzzer rings.

2-11

signal is LOW active.

Page 44

REV.-A

Table 2-3. CPU Port Assignment (cent’d)

Port

Number Assignment

29 30 31

32 33

NMI

INT

MODE 1

RESET

MODE O

x2 CPU external clock input. This printer is driven with a 14.74 xl

Vss

,,0

Signal Line

Name

—

Non-maskable interrupt input.

Description

The interrupt routine is executed at the trailing edge of this signal. This pin is invalid because it is tied to ground.

— Interrupt input. The interrupt routine is executed at the leading

edge of this signal. This pin is invalid because it is tied to ground.

— External memory space setting port. MODES 1 and O (pin 29)

are both pulled up to HIGH so that an external memory of 64K

RESET

bytes (addresses O through Reset terminal. When this signal is LOW, the printer is reset,

FFFFH)

can be used.

and ports A through C and D are set to be high impedance input ports, and port F is set to be an address output (start address OH).

—

Refer to pin 27, MODE 1.

MHz clock. The operation codes are fetched at approximately

1.3 MHz, and memory read/write operations are performed at

approximately 1.6 MHz.

— —

Ground terminal.

Ground terminal for the A/D converter in the CPU.

ANO

36 37

40 41 42

43 AV

AN2

AN3

AN4

AN5

AN6 -

AN7 -

VAREF

SW2-1

Analog input port of the 8-bit A/D converter in the CPU. Reads the states of DIP SW2-1 through SW2-3.

SW2-3

SW2-4 Analog input port of the 8-bit A/D converter in the CPU. Reads

the state of DIP AUTO FEED XT signal line of the interface. When DIP

SW2-4. This signal line is connected to the

SW2-4

is ON, the automatic paper feed function is valid. When the DIP switch is OFF, this function is controlled by a signal from

the host computer (not fixed).

—

Analog input port for the 8-bit A/D converter in the CPU.

Reads the

~ signal is HIGH, DC valid. When it is LOW, DC

SLCT

IN signal from the interface. When the

l/DC3

control from the host computer is

l/DC3

control is ignored, and the

SLCT-

printer is always selected as a device. (The signal can be tied LOW using jumper J 1.)

+24 Analog input port for the 8-bit A/D converter in the CPU.

Monitors the +24 V voltage and controls the printhead drive

pulse width.

— —

Not used. Not used.

Reference voltage input for the 8-bit A/D converter in the CPU. Power supply input for the 8-bit A/D converter in the CPU.

Memory read timing strobe signal. Connected to the RD strobe terminal of the gate array and the output enable terminal of the ROM and RAM.

2-12

Page 45

Table 2-3. CPU Port Assignment (cent’d)

REV.-B

Number

62 63

.—

Port

~ssignment

ALE

PFO

PF7

PDO

PD7

V DD

Vcc

1/0

Signal Line

Name

ALE

[

A 15

DBO

(AO)

DB7

(A7)

—

Description

Memory write timing strobe signal. Connected to the WR strobe terminal of the gate array and the write enable terminal of the RAM.

Address latch enable signal. Controls address latching performed inside the gate array (enables latching when the signal

is HIGH).

8-bit 1/0 ports with output latch. Used as the upper address

bus according to the MODE 0/1 terminal selection. For 64K external memory assignment), Al 3 through Al 5 are input to the address decoder in the gate array.

Multiplexed

data bus.

Power supply for the internal RAM (+5

Power supply for the CPU

stable, such as at either a leading or trailing edge (when the

printer power is turned on or off), the reset circuit prevents the CPU from running.

addressldata bus. Used as the lower address and

.—

(+5 VDC).

VDC).

When this voltage is not

NOTES: 1. All barred signal are LOW active.

2. “1/0” denotes either input or output when viewing the signal from the CPU.

2-13

Page 46

REV.-A

2.4.2

This section describes the

E05A03

Gate Array Functions

STROBE

NO-7

DBO-7

ALE

DB6

—

LATCH

(Input

1- I I I I I

E05A03

Data)

I II

functions. Figure 2-12 shows the

TIMING

~’

l-l

E05A03

block diagram.

PRINTHEAD DRIVER

DB7

RESET

(RESI)

AB15

AM4

AB13

(

CARRIAGE MOTOR DRIVER

IATCH

(ControIl

BUSY

RESO

Fig. 2-12.

E05A03

2-14

Block Diagram

Page 47

Functions of the E05A03 gate array (IC3B) are as follows:

1. Address latch

The gate array latches data on address data lines

AB7

and outputs it to

ABO

(when ALE is high, the data is passed through without latching.)

DBO

DB7

at the leading edge of the ALE signal,

REV.-A

2. Address mapping

The gate array inputs an address on AB 13-

AB 15, and selects CS 1 or CS2 or enables the R/W mode

——

of this gate array using internal decoder 2.

3. Handshaking

IN7 at the leading edge of the STROBE signal, and automatically

INO

● The gate array latches data on

outputs the BUSY signal. The BUSY signal

(DB7)

is latched by the timing register to inform the CPU

that data has been transmitted to the CPU.

● The timing for the BUSY signal, which is set at either the trailing or leading edge of the STROBE

signal, is selected by the control program (firmware).

● The BUSY signal output from the timing register is

the firmware.

——

Printhead

solenoid drive pulse

wire-ORed with the BUSY signal controlled by

.—

. When the FIRE signal from the CPU is brought Low, the data that was previously latched is output

on HD 1

● When FIRE is high,

- HD9 to drive the corresponding solenoids in the printhead.

HDI

- HD9 are all low.

5. Shift register

● This gate array includes a shift register

by accessing the specified address

edge of the

signal.

(8bits X 3), and the MSB (Most Significant Bit) can be read

(XX03H) once. The data is shifted one bit to the left at the leading

6. Initialization

When the INIT or

Printhead

●

● PF motor latch (PFA - PFD) are all set low.)

——

RESI

signal is low, the gate array sets

RESO

low and initializes the following.

latch (HD 1 - HD9 are all set low even if FIRE is low.)

——

● CR motor latch (CRA - CRD) are all set high.) . Timing generator (enters the state indicating that no data has been received.)

● Control latch (BUSY is set high (software-BUSY), PE is set low, and PELP, NLQLP, and CNDLP are set

high.)

7. Address decoder 2

Address decoder 2 selects one of the twelve modes listed in Table 2-13 according to the combination

and

of lower address bits OOH - 07H,

2-15

Page 48

REV.-A Table 2-4 shows the

Lower Address

R/W

OOH

OIH

02H

03H O (Sets software-BUSY.)

E05A03

functions and Table 2-5 shows the

Table 2-4.

Name

INO

IN7

—

STRB

HOME

—

INO

- IN7 Directly reads

—

BUSY

E05A03

Reads the data which was latched using STROBE, and resets

the STROBE-BUSY output. Writes data to the upper eight bits of the 24-bit

(DB7

Bit 7: 1 (Indicates the trailing edge of the STROBE signal.) Bit 6: 1 (The HOME input is HIGH.)

Writes data to the middle eight bits of the 24-bit shift register

(DB7 -DBO ~

Writes data to the lower eight bits of the 24-bit shift register

(DB7 -DBO ~

Reads the MSB of the 24-bit shift register and shifts the data one bit to the left

Bit 7: 1 (The BUSY signal is output at the leading edge of

Bit 6: 1 (Resets software-BUSY.)

O (The BUSY signal is output at the trailing edge of

Functions

DBO ~

Bits 23 -

Bits 15

INO

Bits 7 - o).

STROBE.)

(MSB ~ DB7).

E05A03

pin functions.

Function

shift register

16).

- 8).

IN7. Does not affect the BUSY signal.

04H

05H

06H

07H

w PFA - PFD

NLQLP

CNDLP

PELP

HD1

- HD8

HD9

——

CRA - CRD

Bit 4: 1

Bit 3: 1

Bit 2: 1

Latches (and inverts) the data for pins 1 - 8 of the

(DB7 -DBO ~ HD1

LOW.) Latches (and inverts) the data for pin 9 of the

Latches the phase data for the PF motor.

(DB7

Latches the phase data for the CR motor.

(DB3 -DBO ~

(NLQLP

HD9 Data is output when FIRE goes LOW.)

is LOW.) ● See NOTES 2.

(NLQLP

(CNDL

(PE

DB4 ~

is HIGH.)

is LOW.) ‘See NOTES 2.

is HIGH.)

is HIGH and

is LOW and

PFA - PFD)

CRA

PELP

- HD8 Data is output when FIRE goes

- CRD)

LOW.)

HIGH.)

printhead.

NOTES: 1. The above functions are mapped to every eight bytes from COOOH to DFFFH.

2. These are not used in this printer.

printhead.

(DB7

2-16

Page 49

Table 2-5.

E05A03

Port Assignments

Pin No.

3 4

5 6 7 8

15 16

18 19

.— 20

21 22 23 24 25 26 27 28 29 30 31

32,33

34 35 36 37

44 45

46 STROBE 47

54 55

{

63 HD 64

Signal

Vcc

NLQ

PE LP

CR D CR C CR B CR A DB 7

DB8

AB 15

Direction

out

out out out out out

In/Out Data bus 7 - 0

AB 13

ALE WR

FIRE

HOME

RESI

RESO

PF A PF B PF C

PF D Cs 1 Cs 2

GND

In In In In In In In

out

out out PF motor phase C drive pulse

out

out Chip select 1 (lower address)

out

—

CND LP out

BUSY

AB O

out out out

AB 7

INIT

IN 7

IN O

HD 9 out

Vcc

In Strobe In

Description

Power (+ 5V DC)

NLQ

lamp (~/off) “See NOTES 1

Paper end lamp (~/off) Carriage (CR) motor phase D drive pulse CR motor phase C drive pulse

CR motor phase B drive pulse

CR motor phase A drive pulse

Address bus 15 - 13

Address latch enable

Write stroba-

Read strobe

Printhead

Home position signal (Home/Not home)

Reset signal input

Reset signal output

Paper feed

PF motor phase B drive pulse

PF motor phase D drive pulse

Chip select 2 (upper address) “See NOTES 1.

GND

CONDENSED lamp (on/off)

Paper end (Valid/Invalid)

Busy

Address bus O - 7

Initialize

Data bus 1 - 8

Printhead

Power (+ 5V DC)

solenoids trigger

(PF)

motor phase A drive pulse

(_/rest)

● See NOTES 1.

solenoid drive pulse #9 - #1

NOTES: 1. These are not used in this printer.

2. Signal direction is viewed from the

E05A03

2-17

side.

Page 50

REV.-A

2.4.3 Data Flow

This section describes

the firmware start-up operation when the printer is initialized, data flow

(especially printing data flow), and command processing.

LX-800.

Figure 2-13 shows a memory map of the

FFFFt

FFOOt

EOOOI

Coool

AOOOI

80001

00001

RAM

CPU Internal (Down Load Area)

Not Used

Gate

Array

Address Area (Memory Mapped

Not Used

Buffer and Work Area (RAM 8k

bytes

Program Area (ROM

32k byles

Area

Function

1/01

IC4CI

IC3C)

Stack Area

Lim Buffer

hag. Buff.,

(2K bytes)

hut Oata

i3k bvtes)

Buffer

Fig. 2-13. LX-800 Memory

The CPU can access an external memory of 64K bytes, and executes the program external ROM

(IC3C).

The external RAM

(IC4C)

area (8K bytes) and the CPU internal RAM (256 bytes)

Map

(32K bytes) in the

are used as a buffer and working area. The CPU accesses the gate array using the instruction codes (See Table 2-4).

COOOH

through

DFFFH

are defined as memory mapped 1/0.

2-18

Page 51

2.4.3.1 Initialization

When the reset signal is input, the printer is initialized as follows:

REV.-A

CPU

Clears all port outputs. Executes the program from address OH.

—————

;

Clears the ports using hardware resetting.

● Sets the print head data to High-Z(the high

I 1

● Sets the BUSY signal HIGH.

.— ———————— — — . — — .

impedance state).

GATE

ARRAY

——

~------------------------’

Sets up the motors.

1/0 ports. Initializes the CR and PF

—————

Receives the phase data for the motors from the

CPU, and holds the CR and LF motors.

— — —— — ——— — — — — —- —

———————————————

-—-—--—--—-

Clears the memory. Sends the ACK signal to the host computer via the interface.

Performs carriage home position seek.

-“’’’’’’’’’’’’’;’’’”:l

Initializes the gate array.

(Outputs the instructions to the gate array.)

——— ——— — —— —— — —

;

Initialized (the instruction codes are set).

—

.———.——————

————— —— ————

- — — —

——— —

——

~---------------------

Reads the DIP switch settings on the optional

terface board if the board is installed.

Checks whether the paper is set or not. Sends the~ Controls the paper end signal of the interface and

result to the gate array.

Is this self-test printing or hex-

adecimal dump mode?

tors the switch signals from

Enters the interface waiting state (main routine for

data processing).

Fig. 2-14. Initialization

I Reads the DIP switch settings on the optional

in-

terface board upon receiving the instruction code.

;

(XX02H is read.)

—————

the paper end

— —— ——-— —————— —-——————-

— — — — — — ——

——————

lamp on the

(Moni-

Entars tha interface

● Sets the BUSY signal LOW.

———.

control panel.

Select either the self-test

printing or the hexadecimal

dump mode.

data waiting state.

———— .—————————

Flow

-—

———

in-

————

——

2-19

Page 52

REV.-A

2.4.3.2 Print Data Processing After the initialization, the CPU enters the data waiting state. When data is input from the interface, the CPU starts reading the data. Besides this process (main routine), the actual printing process is performed by an interrupt routine. The print data is processed by repeating the main and interrupt routines.

Array

Data

— ACK

–m

$ ~

STRB -----

BUSY ----

*: Main

- :

Interrupt ro”tine

routi”e

CPU

Command

Analyze

(Add the

Attribute)

(!)

—D

fiA

;

Down

Load

--r ---

Input

Data

Buffer

CG Copy Araa

FIRE

Imaga Buffer

Printing

Fig. 2-15. Print Data Flow

The data flow in the Draft printing mode is as follows. Step numbers used in the explanation below correspond to the data flow numbers used in Figure 2-15.

2-20

Page 53

REV.-A

@ The CPU detects the

array detects the trailing edge of the

STRB

signal from the gate array (Reads MMIO and

STRB

signal, it automatically sets the BUSY signal HIGH and

XXOI

H). When the gate

latches the transferred data.

@ The CPU fetches the data latched by the gate array (reads MMIO and

XXOOH),

and stores the data in the input buffer. The CPU analyzes each byte of data to determine whether it is a control code or print data, then returns the ACK signal to the interface.

@ Steps@ and@ are repeated until the input data buffer becomes

full.

When the buffer becomes full,

the BUSY signal is set HIGH.

@ Either during steps@ and@ or after the input data buffer becomes fuil, the CPU analyzes each byte

of data. If the data is not a printing command (CR), the CPU sets the printing mode and parameters and transfers the data to the line buffer. The line buffer is shown in Figure 2-16.

. - ----

Character

code

Attribute

2 code

Character

-- - -

—

—lb’’e+lb’ta-t-lb’te

3bytes (every 1 data)

Fig. 2-16. Line Buffer

The line buffer temporarily stores the data for one line using the format shown in Figure 2-16, and also contains the command flags (1 6 bits), for attributes 1 and 2, for each character. The command

flags indicate what kind of command or mode is specified for the character. According to the

command flags, any of the EPSON

ESC/P commands,

NLQ,

underline, emphasized character, and

font selection, is specified for the character.

When either the CPU detects a printing command (CR) or the line buffer becomes full, the printing process (interrupt routine) is started.

The CPU transfers the character codes from the line buffer to the CG (Character Generator), and

transfers image data to the

copy area. The CG copy area refers to the attribute flags in the line

buffer and expands the image data. The expanded data is then transferred to the image buffer.

The CPU writes the (vertical) dot patterns in the image buffer to port HD of the gate array (writes

MMIO, XX04H, and XX05H). At the same time, the CPU references the contents of the line buffer,

and outputs the FIRE signal (which corresponds to the dot patterns expanded in the image buffer) to the gate array.

NLQ

When the

● During command analysis in step

@ are repeated two times for every one pass (NLQ requires two-pass printing).

step

mode is selected, note the following difference from the Draft mode:

@, if the data is determined to bean

NLQ

character, the steps after

When the download mode is selected, the following point is different from the draft mode:

● When referencing the CG in step

@, the CPU accesses the down load buffer but not the CG.

2-21

Page 54

REV.-A

2.4.4 Reset Circuit

A reset operation is performed when the INIT signal is input from the interface and when the printer

power is turned on. (Refer to Sections 1.4.6, 2.4.1, 2.4.2, and 2.4.3.1 for the reset operation.) Figure 2-17 shows the reset circuit.

E05A03 (3B)

+24

+ D5

MA165

ZD2

HZS1 5-3

R34

12K

RESET (CPU, Pin 28)

‘:;’’’”3’)+

INIT

(CN2, Pin8)

R63

C27

470p

INIT

----

I l—

I I

AND

I I

/ L—---—

RESI

~----

RESO

+AJ--c3

C15

p/5ov

R43

47K

R42

+-+

*m(cN2pin’3)

(lC)

Fig. 2-17. Reset Circuit

The I NIT signal from which noise is attenuated by of the

E05A03

is turned on, the level of the

is connected to the power supply (+ 5 V and +24 V) reset circuit. When the printer power

RESI

signal is held at its threshold level or below (LOW level) until the voltage

R63 and C27 is input to the

of the +24 V line reaches the Zener voltage of ZD2 (when the power is turned off, the sequence

reverses). The same sequence is followed for the + 5 V line. The level of the

threshold level or below (LOW level) until the voltage of the +5 V line reaches +5 V. In addition, the

RESI

level of the

signal is held LOW by R43 and C 15 for approximately 47 ms after the power supply voltages become stable. The Schmitt trigger gate (CMOS level) at the input terminal of the shapes the analog waveform. The

RESO

the

terminal to the RESET terminals of the CPU and the interface board.

INIT and

RESI

signals are ANDed in the

E05A03.

RESI

E05A03,

The

RESI

terminal

signal is held at its

RESI

signal

then output from

2-22

Page 55

REV.-A

2.4.5 Carriage Motor

This section describes the sensor circuit, an outline of the firmware, and the drive circuit, which are

used to control the carriage motor. The specifications of the carriage motor are as follows:

Angle per step: Number of steps per revolution: Number of phases:

Excitation system and drive frequency:

Drive voltage: Resistance per coil:

2.4.5.1 Home Position Sensor

The home position sensor detects the reference position of the carriage. The sensor is located at the

home position which is to the left of the first column. Figure 2-18 shows the home position sensor circuit.

—.—

Home Position

Sensor

r I

i ~

L_ -d

‘:

I 1

7.5° 48 steps Four

Unipolar drive, 2-2 phase excitation system (900 Unipolar drive,

+24 VDC

41.5 ohms

CN7

I 1

A7Y0

1-1

phase excitation system (450

—

R 20

5.6K

HOME

R32

E05A03

PPS)

(3B)

Fig. 2-18. Home

When the carriage is at the home position, the reed switch is closed, and a LOW signal is input to the HOME terminal of the the carriage is at the home position.

E05A03. The CPU reads MMIO port XX 1 H of the E05A03 to determine when

Position Sensor Circuit

2-23

Page 56

REV.-A

2.4.5.2 Carriage Motor Control

The carriage motor control system is an open-loop system. There are two basic phase switching speeds:

PPS

450

(l-1 phase drive) and 900

PPS

(2-2 phase drive), as shown below. The phase switching is

performed according to the time data (time required to switch a phase) which is determined by the firmware, for the number of counts determined by the firmware. Figure 2-19 shows the basic phase switching patterns.

CRA

CRB

CRC

CRD

speed

Drive

Hold

Carriage

Movement

Direction

H.P.

H.P.S ~

START

‘ight

Left

(2-2 Phase Switching)

‘ight

Left

(l-1 Phase Switching)

Fig. 2-19. Basic Phase Switching Patterns

Constant Speed

-----

~Printing

I I

IMNv

Area

----------------------

time

I I

‘uLrLrl—

STOP

Fig. 2-20. Basic Operation Sequence

2-24

Page 57

Figure 2-20 shows the basic sequence for the carriage operation.

● C. H.P.S. (Refer to Section 2.4.5.3)

When the printer is initialized, a carriage home position seek is performed. Then the carriage motor enters the holding mode at the operation start position (START).

● Rt

(Rt)

At least 6 ms of rush time

is set just before acceleration and after deceleration to stabilize the

motor operation. It takes 75 ms for the carriage motor to restart from the stop mode.

● Acceleration mode

The acceleration mode consists of a maximum of 12 steps, and the time period for each step becomes shorter as the step number increments. In the acceleration mode, the CPU checks the home position signal each time the phase is switched, and a carriage error occurs if the home position signal goes

HIGH.

REV.-A

●

.Ccmstant

speed mode

. After acceleration completes, the carriage motor enters the constant speed mode. Printing is started when the carriage motor enters this mode. The time period for each step is the same, 2.22 ms at

PPS

450

and 1.11 ms at 900

PPS.

● Deceleration mode

The deceleration mode consists of a maximum of 12 steps. The time period for each step becomes longer as the step number increments.

The 450

speed (l-1 phase drive) is used for printing NLQ characters, and the 900

PPS

speed (2-2

PPS

phase drive) is used for printing Draft characters. The patterns for the phase switching and the time data are contained in the working area of the RAM. The CPU uses this data as a reference table, and outputs the phase data to the E05A03 in accordance with the timing of the character to be printed.

(MMIO XX07H write operation)

2-25

Page 58

REV.-A

2.4.5.3 Home Position Seek Figure 2-21 shows the home position seek operation (actual carriage movement)

Held for 20 to 30 ms according to the phase data combination.

Moves from left to right for

four steps, then stops.

Moves from right to left for

four steps, then stops.

Moves from right to left until it reaches the home position.

Decelerates for five steps,

then stops.

Moves from left to right until it leaves the home position.

Decelerates for five steps, then stops.

Is this the

home position?

Moves from right to left with a step time intewal of 10 ms until it reaches the home position.

Fig. 2-21 Home Position Seek Operation Flow

A home position seek is performed when the hardware is initialized. Because the carriage control is an open-loop system, the CPU must perform a home position seek in order to get the carriage to a known

reference position. This operation is performed at 450 PPS (l-1 phase drive). The printing start position (column 1) is 25 steps to the right of the home position. The carriage does not return to the home position unless the printer power is turned off. When the carriage motor is in the acceleration mode or the normal printing mode, the CPU checks the home position signal every time the phase is switched. If the CPU detects that the carriage is at the home position, it regards this as a carriage error.

2-26

Page 59

2.4.5.3 Carriage Motor Drive Circuit Figure 2-22 shows the carriage motor drive circuit.

E05A03

(3B)

CPU

—

CRB

CRC

CRD

(2B)

3.3Kx4 ‘

R29

R30

R31

7b_D1843x4

+24 +5

3.3K

Q19

B131

EMO1 ZW

—

:RA

0--

;RB

Q-

-o1

,—,

cRCOM

ciiCOM

REV.-A

Fig. 2-22 Carriage Motor Drive Circuit

The carriage motor drive circuit is a constant voltage switching circuit

CR of the the +24 V is applied to

mode).

2.4.6 Paper Feed Motor

This section describes the sensor circuit, an outline of the firmware, and the drive circuit, which are

used to control the paper feed motor. The specifications of the paper feed motor are as follows:

Angle per step:

Number of steps per revolution: Number of phases: Excitation system and drive frequency: Drive voltage: Resistance per coil:

E05A03

is HIGH, the voltage is applied to the coil of the motor. When PAO of the CPU is HIGH,

CRCOM

(drive mode). When it is LOW, +5 V is applied to

7.5” 48 steps Four

Unipolar drive, 2-2 phase excitation system (480 PPS)

+24 VDC

58 ohms

*7%

(unipolar

drive). When output

CRCOM

(holding

2-27

Page 60

REV.-B

2.4.6.1 Paper End Sensor The paper end sensor detects whether paper is present or not. Figure 2-23 shows the paper end sensor circuit.

CN6

5.6K

(26)

-27

Fig. 2-23. Paper End Sensor Circuit

When the paper runs out (of the detection area), the reed switch closes, and port PA5 of the CPU goes

LOW. The paper end detector is checked each time the phase is switched. The firmware controls the

following three operations:

● When a paper end is detected during printing, firmware stops printing and sets the printer OFF LINE.

● When a paper end is detected during initialization, firmware sets the printer OFF LINE.

● When the AUTO LOAD switch is pressed in the OFF LINE state: Firmware executes the auto loading

function (refer to Section 2.4.6.3) if paper is not already loaded or executes paper feeding (normally

one line) when the paper is loaded.

If the paper is loaded or ejected by pressing the FF or LF switch without executing printing, the printer is not placed OFF LINE due to paper end detection.

Paper

Frame (L)

62.5mm

288mm

Fig. 2-24. Paper End Detection Area

2-28

Approx.

Frame (R)

50mrn

Page 61

REV.-A

2.4.6.2 Paper Feed Motor Control

The paper feed motor is controlled by an open-loop system just like the carriage motor. The basic phase

switching speed is 480 PPS (2-2 phase drive), and the phase switching is performed according to the phase pattern stored

in the firmware. Figure 2-25 shows the basic phase switching pattern.

PFA

PFB

PFC

PFD

Speed

Power ON

~Rtl

Drive

~---vuvu

Hold

Platen

Movement Direction

Back

—

Fig. 2-25. Phase Switching Basic Pattern

Constant Speed

----------

~----%

Fig. 2-26. Basic Operation Sequence

Normal

I 1

1 1

I 1

1 ;

Rt2

STOP

;

2-29

Page 62

REV.-B Figure 2-26 shows the basic sequence for the paper feed motor.

Rtl

●

When the printer power is turned on, the paper feed motor is rushed for 30 to 60 ms in any phase.

It takes 25 ms for the paper feed motor to restart from the stop mode. And after that, the paper feed motor rotates both back and front for each 16 steps to fix the back-rush between the motor pinion

and gears.

● Acceleration mode

The acceleration mode consists of a maximum of four steps, and the phase switching time for each

step becomes shorter as the step number increments.

● Constant speed mode

After the acceleration completes, the motor enters the constant speed mode. The time period for

each step is the same, 2.03

. Deceleration mode

The deceleration mode consists of a maximum of 12 steps, and the phase switching time for each

step becomes longer as the step number increments.

ms.

Rt2

●

When the paper feed motor decelerates and stops, it enters the holding mode after the rush time

of 15

The paper is fed 1/6 inch (4.23 mm) per 36 steps. When the total number of steps is 10 or less, the

paper feed motor is driven only in the constant speed mode, but with a step time of 3.28 switching pattern and time data are contained in the working area of the RAM. The CPU outputs the data to the E05A03 the number of times specified by the program.

2.4.6.3 Auto Loading Function

The sequence for the auto loading function is shown below.

In this way, the printing start position is set approximately 22 mm from the top of the paper.

ms.

(MMIO XX06H write operation)

1. The printer moves the carriage to the 40th column.

2. The printer drives the paper feed motor for 433 steps to load the paper.

Approx.

22mm

1st

column

ms.

The phase

EPSON LX-800

Fig. 2-27. Printing Start Position

2-30

Page 63

REV.-A

The auto loading function is valid under the following conditions:

● When the printer is OFF LINE.

● Just after the signal from the paper end sensor changes from LOW to HIGH. (The leading edge of

the signal is checked for.)

2.4.6.4 Paper Feed Motor Drive Circuit Figure 2-28 shows the paper feed motor drive circuit.

E05A03

PFA

PFB

PFC

al 7

Q16

CN5

“

PFD

3.3K

X 4

77!7 D1

843x4

(3B)

— .—

CPU

3 4 ‘

PA2

+J+”JL

(lC)

(2B)

The paper feed motor drive circuit is a constant voltage switching circuit

same as the carriage motor drive circuit. When output port PF of the to the motor coil. When V is applied to

PFCOM.

5.6K

PA2

+24 +5

3.3K

Q18 B1

093

EMOIZW

Fig. 2-28. Paper Feed Motor Drive Circuit

of the CPU is HIGH, +24 V is applied to

R17

33 D3

E05A03 is HIGH, voltage is applied

(unipolar drive), which is the

PFCOM.

When it is LOW, +5

2-31

Page 64

REV.-A

2.4.7

Printhead

This section gives an outline of the software that controls the printhead, the drive pulse width control,

and the drive circuit. The specifications of the

Number of solenoids Drive voltage Coil resistance

Printhead

2.4.7.1

drive pulse width: 360 PS

Printhead Control

The data is output to the

Print data is expanded in the image buffer as dot patterns. The CPU outputs the dot patterns to the

: Nine : +24 VDC

: 19.2 ohms

&10

printhead in the following sequence:

printhead are as follows:

+10%

ps (at 24 V, 25°C)

E05A03.

The data for pins 1 through 8 of the

printhead is latched by HD 1 through HD8 of the

E05A03.

(MMIO

XX04H write operation)

The data for pin 9 of the

printhead (usually for underlining) is latched by HD9 of the

E05A03

via

DB7.

After latching the data, the printhead drive pulse width signal FIRE is output from the event counter

in the CPU. While the FIRE signal is LOW, the gate opens so that the data at HD 1 through

HD9 is

output.

The timing of the event counter in the CPU is set mechanically. The data write operation is completed within one cycle of the counter. The operation described below is inhibited to protect the

printhead

from being damaged.

FIRE

Normal

Dot Pattern

Half Dot Pattern

time

Fig. 2-29. Printhead Drive Pulse

Pattern

Figure 2-29 shows the sequences for the normal and half dot printing, which can be performed at any

pin of the

● in the above figure) is inhibited. If this pattern exists after expanding the image data, one dot will be

printhead. Driving the printhead continuously to print adjacent half dots (the portion marked

ignored.

2-32

Page 65

2.4.7.2 Printhead Drive Pulse Width Control Circuit In order to keep the value of the line, the

The

2-Bn

printhead common voltage, and uses the voltage

printhead drive pulse width is controlled to be within the area shown by the oblique lines in Figure

!W.

400

printhead drive pulse width constant, the

level

to adjust the width of the FIRE signal.

425

405

CpU

monitors the +24 VDC

REV.-A

-.—

350

300

I I

I ,

21.6

Printhead Driving Voltage

wYz////z

350

;

I I

I 1

[V] ~

I 1

26.4

Fig. 2-30. Printhead Drive Pulse Width Range

+24V

R36

2.2K

l/2W

VAref

AVCC

+5 +24

! ?!-

s= *W

-.-,

)

.-.

345

325

Fig. 2-31. +24

The CPU monitors the +24 V line at

VDC

Monitor Circuit

AN5 of the 8-bit analog to digital converter, computes the result,

and controls the drive pulse width of the signal (FIRE) output from the event timer. 4.7 V is applied to

reference voltage input

(approximately 4.08 V at

VAref by ZD3, and the voltage obtained by dividing +24 V by R37 and R35

+24.OV)

is input to AN5.

2-33

Page 66

REV.-A

2.4.7.3 Printhead Drive Circuit Figures 2-32 and 2-33 show the

E05A03

(3B)

printhead drive circuit and the waveform of the drive voltage.

CN4

+24V

Solenoid Coil

Q1-Q9

C3293

HDn

R52

I R61 IK

Fig. 2-32. Printhead Drive Circuit

s.,e.oid..rre.t~::::;:

Waveform

~A4:l-

Drive Transistor Collector Voltage

Waveform

.=approx. 360Ps

Fig. 2-33.

B=approx.

Solenoid Current and Drive

2.4.8 Print Timing Control

This section describes the print timing control for the carriage and printhead and the bidirectional logic

seeking function.

2.4.8.1 Print Timing Control for the Carriage and The phase switching of the carriage motor and the the relationship between the two is shown in Figure 2-34.

40ps

C=approx. 1.11 ms

Voltage Waveforms

Printhead

printhead driving are controlled by the CPU, and

2-34

Page 67

FIRE

REV.-A

.—

HD1

HD2

H~~

HD8

HD9

HD1

-8 (H) 41 22 14 08 14 22 41 00

HD9

(H) 80 80 80 80 80 80 80 80

—

00...

00 . . . . .

Fig. 2-34. The Relationship Between the Carriage and Printhead Control Signals

Figure 2-34 shows the relationship between the carriage and the printed in the Draft mode. The dot data of HD 1 through

of of the drive voltage to the 92

The phase switching for the carriage motor is performed asynchronously with the application

printhead. A delay time (Dt) of 46 psec. in the Draft mode (900

psec. in the

NLQ

mode (450

PPS)

is used in order to protect the +24 V line from being overloaded.

HD8 and HD9 synchronizes with the LOW level

Printing for one line is performed in the sequence described above. In the

printhead when character “~” is

PPS)

and

NLQ

mode, half of the dot

pattern is printed for one line, the paper is fed for 1/216 inch, and the remaining half of the dot pattern

PPS),

is printed. In the half speed mode (valid when the printing speed is 900

Ps)

width is doubled (720

and the carriage drive speed is halved (450

the printhead drive pulse

PPS).

2.4.8.2 Bidirectional Logic Seeking

The bidirectional logic seeking is controlled by the CPU. The CPU starts printing after expanding the

print data. However, the processing of the next group of data is started while printing the former group.

In this way, the CPU can determine the carriage return position for the next group of data so that the carriage can be moved the shortest distance before printing the next line. Figure 2-35 shows this operation.

2-35

Page 68

REV.-A

EPSON

--N;;:

Carriage Operation

(Constant Speed)

Carriage Operation

(Acceleration/Decelerat

Paper Feed Operation This is Draft mode printing

ion]

LINE1

@l@

T E R M

INA

LINE2

INT

E R ~~

Printing Area

LINE3

4,,1<,1

12345

Acceleration Area

Home PositIon

1-3: 4-5: 6: 7-9:

10:

1 1-12: Printing of the 3’rd line

Printing of the 1st line Logic seeking Paper feed Printing of the 2nd line Paper feed

I I

----(column )

11--

Fig. 2-35. Logic Seeking

Upon receive in print data “EPSON” for a line from the host computer, the printing is performed in an action of

The CPU, receiving the next data from the host computer, analyzes it and determines the acceleration start position of the carriage.

In an action of the carriage goes through acceleration printing and deceleration feed is operated

In an action of @ to @, acceleration, printing, and deceleration are performed

@ to @ with the carriage and printhead moving to position

@ to @, the carriage is moved to position @, here paper feed is operated @. Then

@,@, @to

2-36

position Q, next paper

Page 69

REV.-A

2.5 PRINTER MECHANISM OPERATION

The printer mechanism includes sensors, the carriage, the paper feed, and the ribbon feed mechanism. Figure 2-36 shows an external view of the printer mechanism.

Fig. 2-36. Printer Mechanism External View

(Model-3A10)

2.5.1 Sensor Mechanism

This subsection describe the two sensor mechanisms:

Home Position Sensor The home position sensor functions to determine the home position of the carriage, and sends a reference signal for print start position. The home position sensor mechanism consists of the mechanical switch which is operated by lever at the bottom of the frame. When the detection pIate pushes the lever of sensor, the mechanical switch closes.

Paper End Sensor The paper end sensor detects the presence/absence of paper. The paper end sensor mechanism consists of a mechanical switch which is operated by paper end sensor Iever. When the paper supply has run out, the mechanical switch closes.

home position sensor and paper end sensor.

2-37

Page 70

REV.-B

2.5.2 Carriage Mechanism

The carriage mechanism includes the the platen. Fig. 2-37 shows the carriage mechanism.

The timing belt is connected into the bottom of the carriage. This belt is driven by the carriage motor

and moved via the belt driven pulley. moved right and left along the carriage guide shaft and plate.

printhead, the carriage, the timing belt, the carriage motor, and

The printhead is mounted on the carriage, and the entire unit is

Left

Carriage Guide Shaft

Fig. 2-37. Carriage Mechanism

: Driving Pulley

2-38

Page 71

REV.-B

Printhead

The dot wire operation during printing is as follows: when the head driving coil for a dot wire is energized, the actuating plate engaged with the dot wire at one end is attracted to the iron core and drives the dot wire toward the platen. The dot wire strikes the ribbon and the paper against the platen to print a dot in the paper. When the head driving coil is deenergized, the actuating plate returns to the initial position as a result of the action of the actuating plate spring. After striking the platen, the dot wire also returns to its initial position as a result of impact energy and from the wire resetting spring, and the dot wire is held in engagement with the actuating plate until it is driven again. Fig. 2-38 shows the

printhead printing operation.

Platen

—

Actuating Plate

Wire Resetting Spring

Stopper

Dot Wire

Act~ating Plate Spring

Fig. 2-38. Printhead Printing Operation

Ribbon Mask

(]

Paper

2-39

Page 72

REV.-B

2.5.3 Paper Feed Mechanism The paper feed mechanism operates by friction feed method for cut sheets, and roll paper, and by the

sprocket feed method for fanfold paper.

2.5.3.1 Friction Feed Operation The paper is held against the platen by two paper feed rollers and by the printer cover. At this time, the paper feed motor is driven to rotate the platen gear, via the paper feed reduction gear, in the direction shown in Figure 2-39. The rotation of the platen Gear feeds the paper in the direction of the arrow due to friction from the paper feed rollers and platen.

Because the paper is held against the platen by the spring force of the paper feed rollers, the paper

can be released by shifting the paper release lever forward.

Fig. 2-39. Friction Feed Operation

2-40

Paper Feed Motor

Page 73

REV.-B

2.5.3.2 Sprocket Feed Operation When the printer is using the sprocket feed method, the holes in the paper are set over the sprocket pins along the sprocket wheel. The paper feed motor is driven to rotate the gears, via the pinion on the shaft of the motor, in the direction shown in Figure 2-40. Rotating the gears rotates the sprocket wheels, which advances the paper in the direction shown by the arrow. For the sprocket feed method, the pressure of the paper feed rollers against the platen is released by shifting the release lever forward.

—

Fig. 2-40. Sprocket Feed Operation

2-41

Motor

Page 74

REV.-B

2.5.4

The ribbon feed mechanism consists of the ribbon cartridge and the ribbon feed

driving gearalways turns counterclockwise, via the geartrains shown in Table 2-6,

direction of the timing belt.

Figure 2-41 shows ribbon feed mechanism. The inked ribbon is inside the cartridge case in an endless

state, held between the ribbon feed and ribbon pressure roller mounted on the ribbon driving gear. The rollers are driven by the movement of the gear, and the inked ribbon is fed. A ribbon breaking spring is attached at the exit of the cartridge case to prevent the ribbon from slacking. A ribbon mask is installed for preventing the ribbon from staining the paper.

Ribbon

Direction of Movement of Carriage

Left to right (arrow ● )

Right to left (arrow ~)

Feed Mechanism

Table 2-6 Ribbon Feed Gear Train

Belt driven pulley ~ Planet gear (1)

Planet gear (2) + Ribbon driving gear

Belt driven pulley

Planet gear (3) ~ Planet gear (4) Ribbon driving gear

Gear Train

Planet gear (1)

section. A ribbon irrespective of the

Ribbon Feed Roller

Ribbon

Ribbon Transmission Gear

Ribbon Driving Gear

‘ane””w

ressure

‘

‘O’’er\ \

‘k

Ribbon

riage

Breaking

Spring

Fig. 2-41. Ribbon Feed Mechanism

2-42

Page 75

CHAPTER 3

OPTIONAL EQUIPMENT

REV.-A

3.1 GENERAL

3.2 OPTIONAL INTERFACES

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

LIST OF TABLES

Table 3-1. Optional Interfaces

3-1

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

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

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

3-1

3-i

Page 76

REV.-A

3.1 GENERAL

This chapter describes the options available for the LX-800.

3.2 OPTIONAL INTERFACES

The LX-800 use the 8100 series optional interfaces. The optional interfaces are listed in Table 3-1.

Table 3-1. Optional Interfaces

Cat No.

RS-232C Current

IEEE-488

Special

Interface

● When the #8 143 is used in LX-800, serial/parallel conversion is available only following conditions.

Loop

P-IB)

. . . . .

Baud rate:

Available

75 to 9600 bps

●

8 143

8145

8148

8165

8133W

Buffer Size

APPLE

. . . . .

Not available

None

2K/8K

11,

using 8K-byte

Flag Control

Function

AH, L, DC

Description

X-ON/OFF Max. Bit Rates

o 0 o o 0

Listen Only

Operation Operation

Application

ROM

Control

(BPS)

19200

9600

19200

Address

Handshaking: DTR or X-ON/OFF control

NOTE: Refer to the “Optional Interface Technical Manual” for details.

3-1

Page 77

CHAPTER 4

ISASSEMBLY, ASSEMBLY, AND

ADJUSTMENT

REV.-A

4.1

GENERAL REPAIR INFORMATION

4.2

DISASSEMBLY AND ASSEMBLY

4.2.1 Removal of Printhead

4.2.2 Removal of Cases

4.2.2.1 Upper Case Removal

4.2.2.2 Control Panel

4.2.3 Removal of Electric Circuit Boards

4.2.3.1 ROCX Board Removal

4.2.3.2 ROC Filter Unit Removal

4.2.4 Removal of Printer Mechansim

4.2.4.1 Removal of Platen Unit and Paper Guide . . . . . . . . . . . . . . . . 4-7

4.2.4.2 Removal of Printer Mechanism

4.2.5 Disassembly of Printer Mechanism

4.2.5.1

4.2.5.2

4.2.5.3

4.2.5.4

Paper Feed Mechanism Removal Removal of Paper Feed Motor Removal of Paper End Sensor Disassembly of Platen Unit

(LCPNL

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

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

Board) Removal . . . . . . . . . . . . . . . . . . . . . 4-5

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

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

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

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

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

“–

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

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

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

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

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

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

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

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

4-1 4-3 4-3

4-5 4-5 4-6 4-7

4-8 4-9 4-9 4-12 4-12 4-13

4.2.5.6

4.2.5.7

4.2.5.8

4.2.5.9

4.3

4.3.1 Platen Gap Adjustment

Removal of Carriage Unit Removal of Carriage Motor Removal of Home Position Sensor

Disassembly of Ribbon Feed Mechanism . . . . . . . . . . . . . . . . 417

Disassembly of Tractor Unit

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

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

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

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

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

4-i

4-13

416

417

418

420

Page 78

—

LIST OF FIGURES

Fig. 4-1 Fig. 4-2. Fig. 4-3.

Fig. 44.

Fig. 4-5. Fig. 4-6. Fig. 4-7. Fig. 4-8. Fig. 4-9. Fig. 4-10. Fig. 4-11. Fig. 4-12. Fig. 4-13. Fig. 4-14. Fig. 4-15. Fig. 4-16.

Printhead Removal

Upper Case Removal-l Upper Case Removal-2

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

ROCX Board Removal ROC Filter Unit Removal Printer Mechanism Removal Platen Unit Removal Printer Mechanism Rear View Printer Mechanism Removal Removal of Paper Guide Plate Removal of Release Lever Removal of Paper Feed Roller Shaft

Removal of Paper Guide Plate and Spacer . . . . . . . . . . . . . . . . . . . . . . . . 4-10

Paper Guide Plate and Spacer Assembly Points . . . . . . . . . . . . . 4-11

Paper Release Lever and Paper Guide Plate