Epson MX-82, MX-82 F-T User Manual

MX-82

EPSON DOT MATRIX PRINTER

Operation Manual

MX

MX-82 F/T

EPSON

P8190027-2

Copyright 0 1981 by EPSON,

Shinshu Seiki Co., Ltd.

Nagano, Japan

“All rights reserved”

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

TABLE OF CONTENTS

GENERAL DESCRIPTION....................................................................................

1. Introduction

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

2. Characteristics................................................................................................

INSTALLATION OF MX-82.................................................................................

1.

Unpacking...............................................................................................

1.1

Unpacking steps

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

.....

1.2 Repacking steps ......................................................................................

2.

Counting the Parts .....................

3.

Installation of the Printer ...............................................................................

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

4. Cartridge Ribbon Setting..............................................................................

5.

Separator Installation .....................................................................................

6.

Paper Loading ................

6.1

Loading of fanfold paper............................................................................

6.2 Removal of fanfold

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

paper ..........................................................................

10

10

10
14

6.3 Column layout on fanfold paper.................................................................... 14

6.4 Top of form position setting.........................................................................

7. Gap Adjustment

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

14
15

8. Power Connection ....................................................................................... 16

INSTALLATION OF

MX-82 F/T...........................................................................

17

1. Unpacking .........................................................................................................17

1.1 Unpacking steps......................................................................................... 17

1.2

Repacking steps.......................................................................................

2.

Counting the Parts . . . . . . . . . . . . . . . .

3.

Installation of the Printer ........................................................................................... 19

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

4. Cartridge Ribbon Setting..............................................................................

5. Separator Installation.......

6.

Mounting and Dismounting of Tractor Unit.....................................................

7.

Paper Loading......................

7.1 Fanfold paper........

7.1.1

Loading of fanfold paper .......................................................................... 25

7.1.2 Removal of fanfold

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

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

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

paper........................................................

17
18

22

23

24

25
25

27

7.1.3 Column layout on fanfold paper ..................................................................28

7.1.4

Top of form position setting.......................................................................

7.2

Roll paper ................................................................................................

7.2.1 Roll paper holder

7.2.2

Loading of roll paper

7.3 Cut paper sheet

7.3.1

Loading of cut paper sheet ......................................................................

8.

Gap Adjustment ..................

9.

Power Connection ................

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

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

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

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

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

28
29
29
29
30
30
34
34

1
1

2
3

3
3

3

3
5
8

OPERATION

1.

Switches and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.1 Switches ..................................................................................................

1.2 Indicators .................................................................................................

2.

Buzzer

3.Paper End Detector ......................................................................................

4. Self-Test.

5. Setting of DIP Switches ......................................................................

5.1

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

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

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

Setting of DIP switch 1

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

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

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

5.2 Setting of DIP switch 2 ..............................................................................

5.3 Coding tables ...............................................................................

6.4

Setting sequence of funcional specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

WHAT IS THE MX-82?

1.

What is a Dot Matrix Printer? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.

Definition of Some Terms Often Used .......................................................................

3.

Control Codes in the Text Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.

Control Codes in the bit Image Mode ...........................................................................

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.

Preventive Maintenance ..............................................................................

2.Parts Replacement ...........................................................

SPECIFICATIONS ..............................................................................................

APPENDIXES ....................................................................................................

1. Construction of MX-82 and MX-82 F/T ...........................................................

1.1 Printer mechanism ...................................................................................

1.2 Control circuit board.................................................................................

1.3 Power circuit ............................................................................................

1.4 Printer initialization ...................................................................................

2.

Parallel Interface............................................................................................

3.ASCII Code Table ..........................................................................................

4.

Character Fonts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.

Control Codes ................................................................................................

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

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

36

36

36
37

ii

40

41

45

46

47

48

53

53
56
58
69

80

i3

82

85

85

85
85

88
88

89

91

“96’

LIST OF FIGURES

Fig.

2

Fig.

3

Fig.

4

Fig.

5

Fig.

6

Fig.

7

Fig.

8

Fig.

9

Fig.
Fig. 10

11

Fig.

12

Fig.

13

Fig.
Fig. 14

1 5

Fig.

16

Fig.

17

Fig.

18

Fig.
Fig. 19
Fig. 20
Fig. 21
Fig. 22
Fig. 23
Fig. 24
Fig. 25
Fig. 26
Fig. 27
Fig. 28
Fig. 29
Fig. 30
Fig. 31
Fig. 32
Fig. 33
Fig. 34
Fig. 35
Fig. 36
Fig. 37
Fig. 38
Fig. 39
Fig. 40

1

EPSON MX-82 and MX-82 F/T Dot Matrix Printer..................................................

Contents of Carton . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Laying Printer on Firm Surface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Assembly Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal of Shipping Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal of Printer Lid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Remounting of Printer Lid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cartridge Ribbon Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cartridge Ribbon Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Examples of Correct and Incorrect Ribbon Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Separator Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Insertion of Fanfold Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Raising of Sprocket Lock Levers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Engagement of Paper Feed Holes on Feeding Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Printer with Fanfold Paper Set Completely . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Example of Paper Arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Top of Form . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Gap Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents of Carton . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..........................................

Laying Printer on

Firm Surface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Assembly Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal of Shipping Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal of Printer Lid .......................................................................................................................

Cartridge Ribbon Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

I

Cartridge Ribbon Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Examples of Correct and Incorrect Ribbon Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Separator Installation ........................................................................................................................

Dismounting of Tractor Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Mounting of Tractor Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Insertion of Fanfold Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Raising of Sprocket Lock Levers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Engagement of Paper Feed Holes on Feeding Pins ............................................................................

Printer with Fanfold Paper Set Completely ..................................................................................

Example of Paper Arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Top of Form Position Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Loading of Roll Paper (1) ...................................................................................................................

Loading of Roll Paper (2) ...................................................................................................................

Loading of Roll Paper (3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Loading of Cut Paper Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adjustment of Inserted Paper Position . . . . . . . . . . . . . . . . .

1

4
5
6
6
7
7
8
9

9

10

11

12

12
1 3
13
15

16

18
19

20
20
2 1
22
22
23
23
24
24
25
26
26
27
27
28
29
30
30
3 1

3 1

Fig. 41 Alignment of Side Edges .............................................................................32

Fig. 42
Fig. 43

Form Position Setting Mark ............................................................................................

Print Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

32

32

Fig. 44 Setting of Cut Paper Sheet..
Fig. 45
Fig. 46 Gap Adjustment
Fig. 47
Fig. 48 Printer Initial Check
Fig. 49

Printer with Cut Paper Sheet Set Completely..

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

Switches and Indicators on Control Panel

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

Flowchart of Paper Out Status Release Procedure..
Fig. 50 Removing Manual Paper Feed Knob
Fig. 51

Fig. 52
Fig. 53

Loosening All 4 Screws..

Pulling Out Wires Hooked to Control Panel..

Construction of the Printer

Fig. 54 Location of DIP Switches..
Fig. 55 Setting DIP Switches
Fig. 56 Setting Amount of Line Spacing
Fig. 57 Setting Form Length per Page
Fig. 58 Setting Number of Columns per Line..
Fig. 59 Setting Skip-over Perforation Function
Fig. 60 Dot Wires

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

Fig. 61 Formation of Character “E”.
Fig. 82 Line Spacing
Fig. 63

Relationship between Data and Dot Wires..

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Fig. 64 Data Transfer Sequence in Bit Image Mode..
Fig. 65 Example of Graphic Pattern Formation..
Fig. 66 Normal-Density and Dual-Density Modes..
Fig. 67
Fig. 68
Fig. 69

Examples of Bit Image Printing..
Expressions of Brightness..
Replacement of Print Head..

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

..................................................................... 77

.................................................................... 79

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

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

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

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

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

33
33
35
36
38
39

41

42
42
43
44
44
48

49
50
51
53
53
54

71
72

73
75
76

Fig. A1-1

Control Circuit Diagram
Fig. A1-2 Driver Circuit Diagram
Fig. A2-1
Fig. A3-1

Parallel Interface Timing..

Connection of MX-82, MX-82 F/T to Computers..

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

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

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

LIST OF TABLES

Table 1

Interface Signals in Paper-Out Status..

Table 2 Functions and Conditions of DIP Switch No. 1
Table 3 Character Size and Maximum Column Length..

Table 4 Functions and Conditions of DIP Switch No. 2..
Table 5 International Character Set Designation
Table 6 International Character Sets..

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

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

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

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

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

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

Table A2-1 Connector Pin Assignment and Description of

Interface Signals

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

Table A2-2 Relations among ON:LINE, SLCT IN, DC1 /DC3

and Interface Signal

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

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

84
85
89
94

39
45

46
46

47

47

87

89

GENERAL DESCRIPTION

1. Introduction

Ideal for computer business applications, the MX-82, MX-82 F/T Dot Matrix Printer
is the latest extension of EPSON advanced printer technology. This new printer cou­ples innovative design and precision manufacturing with long life, low cost, light
weight and superior performance. The MX-82, MX-82
matrix print head that can be replaced easily, and 80 CPS bidirectional printing with
logic seeking capability. This printer also offers 48, 79, 96, and 159 column printing
width. And characters can be printed in any desired size-normal, enlarged, con­densed, etc. Another important feature of the MX-82, MX-82 F/T is its capability of
printing not only in both Text and Bit Image” modes but also in mixed Text/Bit Image
Mode.
*Bit Image printing refers to the hard-copy production of illustrations, graphs, charts,
etc., on the Printer by activating 8 dot wires respectively under software control.

A one-chip microcomputer performs all system control and the two built-in stepper

motors of the printer control the carriage movement and paper feeding functions re-

spectively. Therefore, versatile software controls, such as form feed, programmable

line spacing and skip-over perforation are at your disposal. Furthermore, various in-

terface options are available to permit handshaking with most VSBC computers.

In addition to the MX-82 which is an adjustable sprocket pin feed type, a friction and
adjustable sprocket feed type called “MX-82 F/T” is also available. In this manual, in­stallation of MX-82 and MX-82 F/T will be described individually and then the opera­tion which is common to both will be described.

F/T

features a 9 x 9 dot

Fig. 1

EPSON MX-82 and MX-82 F/T Dot Matrix Printer

-1-

2. Characteristics

The MX-82 and MX-82 F/T have been designed as a printer with versatile functions
to meet a wide range of applications from small business to home uses and even for
hobbies. The following is a brief summary of their major characteristics.
(1) Plotter print

Horizontal dot space is equal to the vertical dot space. Similar figure in propotion

to that of CRT screen could be printed out onto the paper.

(2) Both text printing for general data processing and Bit Image printing for graphic

data processing are freely available.

In the Bit Image printing, both normal density (576 dots/line in horizontal direc-

tion) and dual density (1152 dots/line in horizontal direction) modes are select-

able under software control.

(3) Wide variation of printing widths and character sizes.

(a) 48 characters/line (enlarged character)
(b) 79 characters/line (enlarged-condensed character)
(c) 96 characters/line (normal character)
(d) 159 characters/line (condensed character)
(e) Programmable column length

(4) Versatile functions to meet various business applications

(a) Top of Form - page length setting in line or inch units is possible, with initial

setting to 11 or 12 inches.

(b) Skip-over perforation - 1 inch automatic skip-over function selectable by DIP

switch setting or variable under software control.
(c) Programmable line spacing.
(d) Vertical tabulation and horizontal tabulation.
(e) Buzzer, printer select/deselect function.

(5) High throughput by bidirectional printing with logic seeking capability.
(6) Easy-to-replace “throwaway” print head. The print head has a life expectancy of

approx. 100 x

10s

characters.
(7) 8 international character sets are selectable by DIP switch setting or software.
(8) Complete with standard equipment including paper end detector, custom

cartridge ribbon, etc.

-2-

INSTALLATION OF MX-82

1. Unpacking

Before removing the MX-82 from the carton, check the box for evidence of shipping
damage or mishandling. If such evidence is present, notify the carrier immediately.

1.1 Unpacking steps

Unpacking steps are as follows:
STEP 1. Open the carton.

2. Remove accessories.

3. Remove the MX-82 holding its underside and lifting it straight up with the
packing materials attached.

4. Place the Printer with the packing material on a table or any other conven-

ient flat surface.

5. Take off the packing materials carefully.

6. Remove the vinyl cover.

1.2 Repacking steps

Repacking can be carried out by following the above steps in the reverse order. (Re­packing: Shipment for repair, storage, etc.)
NOTE: It is recommended that all original packing materials be saved for reuse in

case the MX-82 requires reshipment in the future.

2. Counting Parts

The MX-82 and standard accessories are as shown in Fig.2. Upon unpacking, if you
notice any listed contents missing or evident damage, contact the store where you
purchased the MX-82 as soon as possible.

-3-

L

2. Separato

3. Cartridge Ribbon-

*

1. MizizGkL

(European Type)

1.

MX-82

2.

Separator

3.

Cartridge Ribbon

4.

Power (Only European Type

5.

MX-82 Operation Manual

Fig. 2 Contents of Carton

220/240V)

1
1
1

1
1

3. Installation of the Printer

(1) Operating site selection

When installing the MX-82, observe the following instructions.
(a) Place the Printer on a bench, tabletop or any other convenient flat surface

with enough room for the separator in the back of the Printer. Your layout
may look like Fig. 3.
NOTE: Rubber feet are provided to prevent the marring of the surface where

the MX-82 is placed.

(b) Avoid operating the MX-82 in places where it may be exposed to direct sun-

light or where a great deal of greasy dust exists in the air.
NOTE: Greasy dust may cause the malfunction of the print head.

(c) Connect the power cord to an outlet separated from those connected to elec-

tric noise-generating equipment, such as large-power motors, refrigerators,
etc.

(d) Do not subject the Printer to temperatures below 5°C

(95-F)

during operation, to sudden changes in temperature, or to extreme

shock.

(e) Avoid using the Printer in humid locations or in the vicinity of heat generating

sources such as heater, etc.

CRT displav

i

Floppy

disk

,,

i

unit

(4O’F)

or above 35°C

/

Interface cable /

Paper

2i!!J

Firm surface / -

Fig. 3 Laying Printer on Firm Surface

-5-

I

/

MX-82

III

I

II

(2) Removal of protective paper for paper end detector

The MX-82 is provided with a protective paper inserted between the inner and

outer paper guides to protect the paper end detector from damage due to
shocks or vibrations during transportation. Before using the Printer, be sure to
remove this paper. If the MX-82 is to be reshipped, remember to return it to the
original position.

(3) Prepare tools

Prepare the following two screwdrivers to disassemble or assemble the printer.

(1) Phillips type screwdriver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1

pc

(2) Round-blade type screwdriver ................................................................ 1 pc

Philli[[

Fig. 4 Assembly Tools

(4) Removal of shipping screws

The purpose of the shipping screws is to protect the MX-82 against any damage

that may be caused by shocks or vibrations during transportation. Before operat-

ing the MX-82, remove the screws as described below. (See Fig. 5)
STEP 1. Stand the printer on its left side.

2. Remove with a screwdriver the two shipping screws visible on the un­derside of the lower case.

Right Side of the Printer

Fig. 5 Removal of Shipping Screws

NOTE: Save the two shipping screws for possible future use

-6-

<SUPPLEMENT>

0

If the printer lid is an obstacle when removing the shipping screws, be sure to

take off the printer lid by observing the following steps. Rough or careless han­dling of the printer lid may result in damage to, or even breakage of, its hinges.

STEP 1. Stand the printer lid upright.

2. Push the printer lid toward the right and pull up its left side. (See Fig. 6)

Fig. 6 Removal of Printer Lid

0

When remounting the printer lid, be sure to observe the following steps:

STEP 1. Fit the right side of the printer lid onto the projection located at the right

corner of the Printer’s upper case. (See Fig. 7)

2. Fit the left side of the printer lid onto the left projection and push the printer
lid down.

Fig. 7 Remounting of Printer Lid

-7-

4. Cartridge Ribbon Setting

EPSON’s Cartridge Ribbon is compact, long-lasting, and very easy to set and re­move. Furthermore, you have no need to soil your fingers in handling it.
STEP 1. Open the printer lid (or remove it).

2. Confirm that the scale (paper retainer) is turned toward the platen and is
touching it.

3. Push the cartridge ribbon down and set it on the printer mechanism. To fa­cilitate the cartridge ribbon setting, be sure to hold the projection at the
center of the cartridge case when pushing the cartridge ribbon down. (See

Fig. 8)

Cartridge Ribbon

I

4. Put the ribbon between the head nose and the ribbon mask. In this case,
the ribbon can be set easily by hooking it to the edge of the head nose and
turning the ribbon feeding knob of the cartridge case in the direction of the
arrow (i.e., counterclockwise) while depressing the ribbon with a ball-point
pen, Then, tension the ribbon by turning the ribbon feeding knob counter­clockwise. (See Fig.9)

Fig. 8 Cartridge Ribbon Setting

Fig. 9 Cartridge Ribbon Setting

NOTES 1:

2: Confirm that the ribbon is neither twisted nor creased and that the car-

I

Incorrect

L

Incorrect setting of the ribbon may cause it to come off.

tridge is set properly.

Ribbon

kRibbon Mask

Incorrect

Fig. 10 Examples of Correct and Incorrect Ribbon Setti

ng

Correct

I

-9-

5. Separator Installation

The separator of the Printer contributes to smooth paper feeding. Set the separator
by inserting its edge into the two holes located at the rear part of the frame of the
printer mechanism. (See Fig. 11)

Paper

Fig. 11 Separator installation

6. Paper Loading

6.1. Loading of fanfold paper

The MX-82 Printer accommodates fanfold paper from 4” to 10” in width. To load
the fanfold paper, observe the following procedure.
STEP 1. Raise the printer lid.

2. Turn the scale toward the front of the Printer and detach it from the platen.

3. Confirm that the paper guide roller is at the center of the sprocket shaft. If
not, set it at the center of the shaft.
NOTE: The paper guide roller contributes to smooth paper feeding.

4. Raise the two paper holding covers, and be sure to insert the fanfold paper

between the frame and plastic roller of the separator. (See Fig. 12)

-10-

‘z&r Guiwaper

Holding Cover

IN OUT

Fig. 12 Insertion of Fanfold Paper

5. Push the paper into the insertion slot between the paper guides at the rear
part of the printer mechanism.
NOTE: Be sure to pass the paper beneath the upper paper guide.

6. After the leading edge of the paper has emerged from the Printer, pull it out
gently to some length.

-11-

7. Raise the two sprocket lock levers to loosen, and adjust the sprocket pin
position to the paper width. (See Fig. 13)

Paper

Fig. 13 Raising of Sprocket Lock Levers

8. Engage the paper feed holes of the paper on the feeding pins, push the

scale back into position, and adjust the tension of the paper. Then push the
paper holding covers and the two sprocket lock levers down. (See Fig. 14)
NOTE: In this case, confirm that the feeding pins are centered in the re­spective paper feed holes of the paper.

Fig. 14 Engagement of Paper Feed Holes on Feeding Pins

-12-

9. Put the printer lid on the Printer.

Fig. 15 Printer with Fanfold Paper Set Completely

NOTE: When the MX-82 is to be used on a desk or a bench, arrangement of the

fanfold paper in parallel with the MX-82 as shown below will permit the
paper to be folded in an accordion style.

I

Fig. 16 Example of Paper Arrangement

-13-

I-

_

6.2 Removal of fanfold paper

To remove the fanfold paper, follow either of the two methods described below.
(1) To disengage the paper from the paper holding mechanism, pull it forward out of

the Printer.

NOTE: Do not attempt to pull out the paper in the backward direction.

(2) Feed the paper out of the printer by electrical operation. For this, turn the Power

Switch on and push the Line Feed button. (Details are described later.)

6.3 Column layout on fanfold paper

When fanfold paper of from 4” to 10” in width is supplied with the MX-82 the gra­duations on the scale can be used as the indexes of print column positions (1-96).
Alignment of the print start position on fanfold paper with the 1 st column position at
the extreme left of the scale will facilitate column layout. Accordingly, center the
paper by adjusting it to these indexes of the scale.

6.4 Top of form position setting

The term “Top of Form position” is defined as the position in which the first print line
lies on the form, and this position is determined when the power switch is turned
on. Namely, adjust the paper position by the manual paper feed knob so that the re­quired line position (i.e., the point at which the first line of the form is desired to be
printed) is at the print head level. If, at this point, power is applied to the printer, this
line position automatically becomes the Top of Form position.
When printing forms, the matchmarks located on both the sprockets facilitate the
setting of the Top of Form position on the fanfold paper. To set the Top of Form po­sition, first enter (or preprint) a mark at a position on the edge of the paper 77 mm
above the first print line position of the paper, then align this mark with the match-

marks on the sprockets by turning the manual paper feed knob. At this point, turn
the Power Switch on and the Printer will recognize this position as the Top of Form
position. Now, the printing can be started from the Top of Form position.

In case of feeding one page of fanfold paper by operating the MX-82 by the input of

FF code, the abovementioned adjustment is effective.

-14-

Fig. 17 Top of Form

7. Gap Adjustment

The adjustment of a gap between the head nose and the platen is used to adjust the
printing pressure as well as to suit the paper of the different thickness.
(1) Move the head adjusting lever (located on the left frame of the Printer) forward or

backward to adjust the gap between the head nose and the platen. (See Fig. 18)
Forward: To widen the gap.
Backward: To narrow the gap.
NOTE: With a thick paper, be sure to widen this gap.

(2) Adjust the position of the head adjusting lever according to the type of paper to

be used.

Paper
Single-leaf paper
Carbon paper sheets

Position of adjusting lever

Set the lever to the 4th step.

Set the lever to the 7th step.

(3) Should printed characters become faint due to the use of the printer for an ex-

tended period, move the head adjusting lever backward (in theOdirection) by one

step. (See Fig. 18)

(4) When a set of carbon paper sheets is used, be sure that no characters are print-

ed within the two lines above and below the perforation.

-16-

8. Power Connection

The EPSON MX-82 Dot Matrix Printer is capable of operating on the following three
types of AC power.
(1) 115V AC, 60 Hz
(2) 220V AC, 50 Hz
(3) 240V AC, 50 Hz

Before connecting the MX-82 to a power source, make certain of the primary AC rat­ing from the label located on the chassis at the rear of the Printer. After connection

of the Printer to the proper power source and upon application of power to the

Printer, “Initialization” will take place in the Printer with the effects described in para­graph 1.4, Appendix 1. If your MX-82 has a primary AC rating different from the

available power source, do not attempt to operate the Printer. Please obtain a re-

placement unit with the correct AC rating from the store where you purchased the
MX-82.

Head Adjusting

(Side View)

Leve

\@ F---

-w

)

7th

step

Fig. 18 Gap Adjustment

-16-

INSTALLATION OF MX-82 F/T

1. Unpacking

Before removing the MX-82 F/T from the carton, check the box for evidence of ship­ping damage or mishandling. If such evidence is present, notify the carrier imme­diately.

1.1 Unpacking steps

Unpacking steps are as follows:
STEP 1. Open the carton.

2. Remove accessories.

3. Remove the MX-82 F/T by holding its underside and lifting it straight up
with the packing materials attached.

4. Place the Printer with the packing material on a table or any other conven­ient flat surface.

5. Take off the packing materials carefully.

6. Remove the vinyl cover.

1.2 Repacking steps

Repacking can be carried out by following the above steps in the reverse order.

(Repacking: Shipment for repair, storage, etc.)

NOTE: It is recommended that all original packing materials be saved for reuse in

case the MX-82 F/T requires reshipment in the future.

-17-

2. Counting the Parts

The MX-82

F/T

and standard accessories are as shown in Fig. 19. Upon unpacking,
if you notice any listed contents missing or evident damage, contact the store where
you purchased the MX-82 F/T as soon as possible.

Dot Matrix Printer

(European Type)

1.

MX-82 F/T

2.

Separator

3.

Cartridge Ribbon

4. Power Cord (Only European Type 220/240V)

5.

MX-82 F/T Operation

Manual

Fig. 19 Contents of Carton

-18-

5.

Operation Manual

1
1
1
1
1

3. Installation of the Printer

(1) Operating site selection

When installing the MX-82 F/T, observe the following instructions.
(a) Place the Printer on a bench, tabletop or any other convenient flat surface

with enough room for the separator in the back of the Printer. Your layout
may look like Fig. 20.
NOTE: Rubber feet are provided to prevent the marring of the surface where

the MX-82 F/T is placed.

(b) Avoid operating the MX-82 F/T in places where it may be exposed to direct

sunlight or where a great deal of greasy dust exists in the air.

NOTE: Greasy dust may cause the malfunction of the print head.

(c) Connect the power cord to an outlet separated from those connecterd to

electric noise-generating equipment, such as large-power motors, refrigera-

tors, etc.

(d) Do not subject the Printer to temperatures below

5’C

(40°F) or above 35°C
(95°F) during operation, to sudden changes in temperature, or to extreme
shock.

(e) Avoid using the Printer in humid locations or in the vicinity of heat generating

sources such as heater, etc.

CRT Display

Fig. 20 Laying Printer on Firm Surface

-19-

MX-82 F/T Type II

(2) Removal of protective paper for paper end detector

The MX-82

and outer paper guides to protect the paper end detector from damage due to
shocks or vibrations during transportation. Before using the Printer, be sure to
remove this paper. If the MX-82 F/T is to be reshipped, remember to return it to
the original position.

(3) Prepare tools

Prepare the following two screwdrivers to disassemble or assemble the printer.
(1) Phillips type screwdriver
(2) Round-blade type screwdriver

F/T

is provided with a protective paper inserted between the inner

1
1

I

(4) Removal of shipping screws

The purpose of the shipping screws is to protect the MX-82

mage that may be caused by shocks or vibrations during transportation. There-

fore, before operating MX-82 F/T, remove the screws as described below. (See

Fig. 22)
STEP 1. Stand the printer on its left side.

2. Remove with a screwdriver, the two shipping screws visible on the un­derside of the lower case.

Fig. 21 Assembly Tools

Right Side of the Printer

F/T

against any da-

,w*

Lower Case

J

Fig. 22 Removal of Shipping Screws

NOTE: Save the two shipping screws for possible future use.

-20-

<SUPPLEMENT>

0

If the printer lid is an obstacle when removing the shipping screws, be sure to

take off the printer lid by observing the following steps. Rough or careless han­dling of the printer lid may result in damage to, or even breakage of its hinges.
STEP1. Stand the printer lid upright.

2. Push the printer lid toward the right and pull up its left side. (See Figs. 23
(1) and

(2))

Printer Lid

(1) Standard

(2) Option

Fig. 23 Removal of Printer Lid

NOTE: The printer lid shown in Fig. 23 (2) is an optional accessory.

-21-

4. Cartridge Ribbon Setting

EPSON’s Catridge Ribbon is compact, long-lasting, and very easy to set and remove.

Furthermore, you have no need to soil your fingers in handling it.
STEP 1. Open the printer lid (or remove it).

2. Confirm that the scale (paper retainer) is turned toward the platen and is
touching it.

3. Push the cartridge ribbon down and set it on the printer mechanism. To fa-

cilitate the cartridge ribbon setting, be sure to hold the projection at the
center of the cartridge case when pushing the cartridge ribbon down. (See

Fig. 24)

Fig. 24 Cartridge Ribbon Setting

4. Put the ribbon between the head nose and the ribbon mask. In this case,
the ribbon can be set easily by hooking it to the edge of the head nose and

turning the ribbon feeding knob of the cartridge case in the direction of the

arrow (i.e., counterclockwise) while depressing the ribbon with a ball-point
pen. Then, tension the ribbon by turning the ribbon feeding knob counter­clockwise. (See Fig. 25)

Fig. 25 Cartridge Ribbon Setting

-22-

NOTES: 1. Incorrect setting of the ribbon may cause it to come off. (See Fig. 26)

2. Confirm that the ribbon is neither twisted nor creased and that the car­tridge is set properly.

.-Ribbon

Incorrect

Incorrect

Ribbon

I

Mask

Correct

Fig. 26 Examples of Correct and Incorrect Ribbon Setting

5. Separator Installation

The separator of the Printer contributes to smooth paper feeding. Set the separator
by inserting its edge into the two holes located at the rear part of the frame of the
printer mechanism. (See fig. 27)

-“-Separator

Fig. 27 Separator Installation

-23-

6. Mounting and Dismounting of Tractor Unit

The tractor unit of the MX-82 F/T is detachable. If it is an obstacle when using roll

paper, it can be taken out as follows;
STEP 1. Release the lock levers of the tractor unit by pulling in the direction as

shown in Fig. 28.

2. Keep pulling the levers and pull up the tractor unit.

Lock Lever

Fig. 28 Dismounting of Tractor Unit

To install the tractor unit, hook the notches of the tractor frames onto the shaft
shown in Fig. 29 and then push down the tractor unit

Fig. 29 Mounting of Tractor Unit

-24-

7. Paper Loading

7.1 Fanfold paper

7.1.1 Loading of fanfold paper

The MX-82 F/T Printer accommodates fanfold paper from 4” to 10” in width. To

load the fanfold paper, observe the following procedure.
STEP 1. Raise the printer lid.

2. Unlock the release lever by pulling it in the direction of the arrow. (See Fig.

30)

3. Pull the scale toward the front of the Printer to detach the scale from the
platen.

4. Confirm that the paper guide roller is at the center of the sprocket shaft. If
not, set it at the center of the shaft.
NOTE: The paper guide roller contributes to smooth paper feeding.

5. Raise the two paper holding covers, and be sure to insert the fanfold paper
between the frame and plastic roller of the separator. (See Fig. 30)

Paper Holding Cover

\

Release-.--$

Lever

Paper hide

Roller

Scale

Fig. 30 Insertion of Fanfold Paper

-Roller

\

(Side view)

r---+7%

6. Push the paper into the insertion slot between the paper guides at the rear
part of the printer mechanism.
NOTE: Be sure to pass the paper beneath the upper paper guide. Adjust

the position of the head adjusting lever in the forward (+) direction
when inserting thicker paper. (See Section 8, Gap Adjustment)

7. After the leading edge of the paper has emerged from the Printer, pull it out
gently to some length.

-25-

IN

OUT

Frame

8. Raise the two sprocket lock levers to loosen, and adjust the sprocket pin
position to the paper width. (See Fig. 31)

ket Lock Lever

I

9. Engage the paper feed holes of the paper on the feeding pins, push the
scale back into position, and adjust the tension of the paper. Then push the
paper holding covers and the two sprocket lock levers down. (See Fig. 32)

NOTE: In this case, confirm that the feeding pins are centered in the re-

Fig. 32 Engagement of Paper Feed Holes on Feeding Pins

Fig. 31 Raising of Sprocket Lock Levers

spective paper feed holes of the paper. Do not lock the release

-26-

10. Put the printer lid on the Printer. (See Fig. 33)

Fig. 33 Printer with Fanfold Paper Set Completely

NOTE: When the MX-82 F/T is to be used on a desk or a bench, arrange-

ment of the fanfold paper in parallel with the MX-82 F/T as shown
below will permit the paper to be folded in an accordion style.

Fig. 34 Example of Paper Arrangement

7.1.2 Removal of fanfold paper
To remove the fanfold paper, follow either of the two methods described below.
(1) To disengage the paper from the paper holding mechanism, pull it forward out of

the Printer.

NOTE: Do not attempt to pull out the paper in the backward direction.

(2) Feed the paper out of the Printer by electrical operation. For this, turn the Power

Switch on and push the Line Feed button. (Details are described later)

-27-

7.1.3 Column layout on fanfold paper
When fanfold paper of from 4” to 10” in width is supplied with the MX-82 F/T, the
graduations on the scale can be used as the indexes of print column positions (I to

96). Alignment of the print start position on fanfold paper with the 1st column posi­tion at the extreme left of the scale will facilitate column layout. Accordingly, center
the paper by adjusting it to these indexes of the scale.

7.1.4 Top of form position setting
The term “Top of Form position” is defined as the position in which the first print line
lies on the form, and this position is determined when the power switch is turned
on. Namely, adjust the paper position by the manual paper feed knob so that the re­quired line position (i.e., the point at which the first line of the form is desired to be
printed) is at the print head level. If, at this point, power is applied to the Printer, this
line position automatically becomes the Top of Form position.
When printing forms, the matchmarks located on both the sprockets facilitate the
setting of the Top of Form position on the fanfold paper. To set the Top of Form po­sition, first enter (or preprint) a mark at a position on the edge of the paper 77 mm
above the first print line position of the paper, then align this mark with the match­marks on the sprockets by turning the manual paper feed knob. At this point, turn
the Power Switch on and the Printer will recognize this position as the Top of Form
position. Now, the printing can be started from the Top of Form position. (See Fig.

35)

In case of feeding one page of fanfold paper by operating the MX-82 F/T by the in­put of FF code, the abovementioned adjustment is effective.

Matchmark

\J:

fi

Fig. 35 Top of Form Position Setting

-20-

77mm

7.2 Roll paper

7.2.1 Roll paper holder
EPSON offers the roll paper holder as an optional accessory for the MX-82 F/T.

7.2.2 Loading of roll paper

The MX-82 F/T accomodates a roll of single play paper measuring 8.5

kO.12

width with a 1 in. core. To load it, observe the following procedure.

STEP 1, Raise the printer lid.

2. Unlock the release lever by pulling it in the direction of the arrow. (See Fig.

36)

3. Pull the scale toward the front of the Printer to detach the scale platen. (See
Fig. 36)

4. Confirm that the paper guide roller is at the center of the sprocket shaft. If

not, set it at the center of the shaft. (See Fig. 36)
NOTE: The paper guide roller contributes to smooth paper feeding.

5. Insert the end of the roll paper between the frame and the plastic roller of
the separator. (See Fig. 36)

in. in

Fig. 36 Loading of Roll Paper (1)

6. Push the paper into the insertion slot between the paper guides at the rear
part of the printer mechanism. (See Fig. 37)
NOTES: 1. Be sure to pass the paper beneath the upper paper guide.

2. Two-ply roll paper is not recommended for use.

7. Lock the release lever and push the scale back into the original position.

8. While turning the manual paper feed knob clockwise, confirm that the paper
advances straight up. If not, adjust the inserted paper position by unlocking
the release lever.

9. Put the printer lid on the Printer.

-29-

r

Fig. 37 Loading of Roll Paper (2)

Release Lever

Manual Paper Feed Knob

Fig. 38 Loading of Roll Paper (3)

7.3 Cut paper sheet

7.3.1 Loading of cut paper sheet
The MX-82 F/T accommodates cut paper sheets measuring 8.3” to 8.5” in width.
To load a cut paper sheet, observe the following procedure.

STEP 1. Raise the printer lid.

2. Unlock the release lever. (See Fig. 39)

3. Pull the scale toward the front of the Printer to detach the scale from the
platen. (See Fig. 39)

4. Confirm that the paper guide roller is at the center of the sprocket shaft. If
not, set it at the center of the shaft.
NOTE: The paper guide contributes to smooth paper feeding.

5. Insert the cut paper sheet between the paper guides at the rear part of the
printer mechanism.
NOTE: The cut paper sheet can be installed without removing the separa-

tor.

-30-

Release Lever

Fig. 39 Loading of Cut Paper Sheet

6. Lock the release lever.

7. While turning the manual paper feed knob clockwise, confirm that the paper
advances straight up. (See Fig. 40)

Manual Paper

Feed Knob

Fig. 40 Adjustment of Inserted Paper Position

If not, adjust the inserted paper position as follows:

a) If the cut paper sheet or form is long enough, unlock the release lever

and align the side edges of the paper as shown in Fig. 41.

Fig. 41 Alignment of Side Edges

b) If the cut paper sheet or form is not long enough to align the side edges,

align the top edge of the paper with the form position setting mark on
the tractor unit. (See Fig. 42)

Fig. 42 Form Position Setting Mark

The print area on the cut paper sheet is shown in Fig. 43.

210

mm

305

28.6

30.2

mm

1

(8.3”)-218

m5-8
!

or

mm,

:c”sE”~.

CDE

012

mm

f8.5”)

5-8

123

234

mm

(’

2”]J7:q

Fig. 43 Print Area

-32-

Letter Size Paper

I+--..- A4 Size Paper

t-y-

1.

Fig. 44 Setting of Cut Paper Sheet

NOTES: 1. The Paper End Detector function may be disabled under

software control (ESC 8; refer to page 66 provided printing is
left off within 7.5 mm from the paper bottom edge).

2. If the paper is set on the line marked 1/4 as shown in Fig. 44,
then the printing starts from a position 28.6 mm below the top
edge of the paper. If the paper is set on the line marked 1/8,
then the printing starts from a position 30.2 mm below the top
edge of the paper.

8. Push the scale back into position and put the printer lid on the Printer. (See
Fig. 45)

Fig. 45 Printer with Cut Paper Sheet Set Completely

-33-

8. Gap Adjustment

The adjustment of a gap between the head nose and the platen is used to adjust the
printing pressure as well as to suit paper of a different thickness.

Move the head adjusting lever (located on the left frame of the Printer) forward or

(1)

backward to adjust the gap between the head nose and the platen. (See Fig. 46)

Forward: To widen gap.

Backward: To narrow gap.
NOTE: With a thick paper, be sure to widen this gap.
Adjust the position of the head adjusting lever according to the type of paper to

(2)

be used.

Paper
Single-leaf paper
Carbon paper sheets

Should printed characters become faint due to the use of the Printer for an ex-

(3)

tended period, move the head adjusting lever backward (in the 0 direction) by
one step. (See Fig. 46)
When a set of carbon paper sheets is used, be sure that no characters are print-

(4)

ed within the area two lines each above and below the perforation.

8. Power Connection

The EPSON MX-82 F/T Dot Matrix Printer is capable of operating on the following

three types of AC power.
(1) 115V AC, 60Hz

(2) 220V AC, 50 Hz

(3) 240V AC, 50 Hz

Before connecting the MX-82 F/T to a power source, make certain of the primary AC
rating from the label located on the chassis at the rear of the Printer. After connec­tion of the Printer to the proper power source and upon application of power to the
Printer, “Initialization” will take place in the Printer with the effects described in para­graph 1.4, Appendix 1. If your MX-82 F/T has a primary AC rating different from the
available power source, do not attempt to operate the Printer. Please obtain a re­placement unit with the correct AC rating from the store where you purchased the
MX-82 F/T.

Position of adjusting lever

Set

the lever to the 4th step.

Set the lever to the 7th step.

-34-

Head Adjusting Le

BBackward M

Head Adjusting Lever

(Side view)

Forward @I

Fig. 46 Gap Adjustment

-35-

OPERATION

1. Switches and Indicators

There are three switches and four indicators (green LED’s) on the control panel and
one power switch on the right side of the Printer case. In this section, panel opera­ting procedures are covered in sufficient detail for the user to become familiarized

with the Printer. (See Fig. 47 for the control panel.)

I

Control Panel

Fig. 47 Switches and Indicators on Control Panel

1.1 Switches
POWER SW:

ON LINE SW:

Controls primary AC power to the Printer.
NOTE: Before turning this switch on, check to see if the paper is

properly set in the printer.
Incorrect setting of the paper may prevent the Printer from
operating properly.

When the power switch is turned on after paper has been loaded,

the Printer enters the ON-LINE mode and can be utilized in conjunc­tion with a host computer.
Depressing the ON-LINE switch will set the Printer in the OFF­LINE mode, The switch does not function while the Printer is active­ly engaged in printing. The Printer is automatically placed OFF-LINE
if the paper supply is exhausted or if a mechanical error occurs in
the Printer.
The operations of the Line Feed and Form Feed switches are effec­tive only while the Printer is OFF-LINE.

-36-

FF SW:

(Form Feed)

When this switch is depressed once, the paper is advanced vertical­ly to the next Top of Form position. This switch must be depressed
while the Printer is OFF-LINE. Otherwise, the form feed operation
will not be carried out.
The Top of Form position is initialized when the POWER switch is
turned on or when INIT signal is applied to the interface connector.
Therefore, before turning the POWER switch on to start operating
the Printer, set the paper at the appropriate Top of Form position.

LF SW:
(Line Feed)

1.2 Indicators
POWER:

READY:

PAPER OUT:

ON LINE:

The paper advances while this switch is being depressed.
The line spacing for paper advancement is determined by ESC A + n
code (described later). When the Power switch is turned on, the line
spacing is initialized at 1/6 inch.
The line feed operation is prohibited while the Printer is actively en­gaged in printing.

Illuminates while the Printer is receiving AC power.
Illuminates when the Printer is ready to receive data.
Illuminates when the paper supply is near its end.
Illuminates when the Printer is in the ON-LINE mode.

1.3 Printer initial check

Take the following steps and become familiar with the Printer.

Interface cable

Turn on POWER

Check the LF & FF

START

7

Contact
your nearest

EPSON dea,er. qg&&x+

Fig. 48 Printer Initial Check

-38-

2. Buzzer

The buzzer is located inside the Printer case, and sounds for about one second when
the Printer receives BEL code ((07)20H). (See page 66 for the BEL code.)

3. Paper End Detector

(1) When the paper end detector (a reed switch located on the paper guide) detects

that the paper is nearly exhausted, the signals on the interface connector change

to the following status, and the printing operation stops.

Table 1 Interface Signals in Paper-Out Status

To reactivate the printing, take the following procedure as shown in Fig. 49.

Buzzer
behind)

POWER
READY

t

Push the LF

switch (to take out

I

remaining paper)

1

I

I

1 - &ONLINE

I&-- PAPER OUT

FF

Set new paper

J

PAPER OUT indicator off
ON LINE indicator on

= ready to restart printing

Fig. 49 Flowchart of Paper Out Status Release Procedure

-39-

Control panel

(2) When the Printer falls into paper-out status, it is automatically put in the OFF-line

state and paper advancement can be performed by depressing the LF switch.
After setting new paper in the Printer, depress the ON-LINE switch so that the
Printer may resume operation.

(3) There is another way to start the Printer again when it falls into paperout status.

Set new paper in the Printer, and turn the POWER switch off and on again, or ap­ply the INIT signal. In this case, however, all previously established data such as
TAB, line spacing, etc. are cancelled.

(4) The paper end detecting function is useful to prevent erroneous printing when

the Printer is out of paper, If printing of characters up to the last line is to be con­tinued, the paper end detecting function may be made invalid by either of the fol­lowing two methods.
(a) Set the DIP switch pin 1-6 to the ON position, and the paper end detecting

function will become invalid hardwarewise.

(b) Enter control code “ESC 8” and the paper end detecting function will become

invalid softwarewise.

4. Self-Test

The MX-82, MX-82 F/T has a self-test (self-diagnostic) function to check the follow­ing.
(1) Print head operation and printing quality.
(2) Operation of the printer mechanisms (motor, cartridge ribbon mechanism, belt,

etc.)
The self-test function is pre-programmed and can be performed by turning the
POWER switch on while depressing the LF switch. All characters provided by the in­ternal software are printed out on the paper by this operation.

$I$ 1 2

3 q, 5

,i;-’

I:’ I :*:+ z - ‘ ./

. .

;> :.+z $. > -- . . ..”

Q 1, ‘;z 3 <$ !s$ ‘7’ 8’3 :;

c-0 P’

, ,* p., ..f : ;

.::I = ;:. ‘7 ;3 A B c: [‘:I F_’

f” 13 H I J’

1::: L t.jjxl I-IF’ I;:! 6: !s ‘I” 1-I IJ I,J

.::I Z: > ~‘;:*&lsp, ~;ctEfZ (3 1-I 1: ,J 1:; L p-it.4 up I::! R $2; ‘1” 1-1 I,,)l,,J 2;
:*+ ~ --. ,...‘&zj 1. ;~;~;L~~;g,‘;::‘&J.~ : I; .::; =: :::.“~:‘@Af:I:=DEFl~l~ 1 ,Jt:::Lt4f.Jl:SPG!RS.~,.~,,,~,,,~;:.:;,.,.,
.+ ? ..- . /. ‘8 1 :~~~~~~,‘~;zy~:

~- u,/ 13 1 2 :xL). f=j 6 7 8

;

,::I ‘- :;.“;:“-

‘3 :; .::I := ::,

.Ilg& 1::: D E F’ IJj 1-j I .J 1::: L- p1 1.4 0 p Ia R !S 1‘ 1.J 1.) 1.t.I ::.:: ‘I) 2:

‘3

;;I<, )ZJ I-1 [‘:I E l= Gi H ‘J:

J’

1::: L plt.1 f’J [:*I:) R 5: ‘T fJl.,,l (J ::.::‘y’;z C

NOTES: 1. The self-test function cannot be performed when the printer is out of

paper.

2. To check all interface logic including the interface connector, proceed
as follows:
a) Connect ACKNLG signal pin No. 10 to STROBE signal pin No. 1 with

a lead wire.

b) Turn the DIP switch 2-3 (on the control circuit board) ON to effect

auto-line feed.

c) Set the adequate ASCII code data to be printed. To obtain low logic

level signals, connect the data transfer line required for printing (pin
Nos. 2 to 9) to GND level (pin No. 33, etc.)

* Example of printing “Z”

“Z”-[5,A]H-(0101

In this case, connect pin Nos. 2, 4, 7 and 9 to pin No. 33.

5. Setting of DIP Switches

In order to suit the user’s specific requirements, desired control modes are select­able by the two built-ion DIP switches. The DIP switches (SW1 and SW2) located on
the control circuit board of the Printer are as shown in Fig. 54. To gain access to the
DIP switches, the upper case of the Printer must be removed.
NOTE: Turn the power off whenever you attempt to open up the printer case. Ad-

equately discharge static electricity which might be charged in your body, or

it may cause damages to internal electronic parts such as LSl’s, IC’s, etc.
Remove the manual paper feed knob (black knob on the right side) by pulling it
straight out, with firm but steady force. (See Fig. 50)

1010)

Fig. 50 Removing

Manual Paper Feed Knob

-41-

Turn the printer upside down on a soft surface. With a Phillips type screwdriver,

completely loosen all 4 screws. (See Fig. 51)
Place tape over the 4 holes so the screws won’t fall off when you tip the printer right
side up.

Fig. 51

Loosening All 4 Screws

Tip the printer right side up again. Gently loosen the upper case.

Lift up the cover from the left side. And then pull out the wires hooked to the control
panel on the right. (See Fig. 52)

Upper case

Lead wire

Fig. 52 Pulling Out Wires Hooked to Control Panel

-42-

See the inside of the printer before you set the switches.
The printer consists of a printer mechanism, a controller, a transformer and filter cir­cuit board, and a control panel. (See Fig. 53)

Construction of the Printer

Transformer &

7 1

i(cd

J

Control panel

Transformer & filter circuit board

I

I

MX-82 or MX-82 F/T

Dot Matrix Printer

Driver circuit board

HMTP board (Control circuit board)

/

Controller

ter mechanism

female)

Fig. 53 Construction of the Printer

-43-

DIP

swit$h 2

VIP switch 1

Fig. 54 Location of DIP Switches

Position the printer as shown in Fig. 53.

There are two “DIP’ (DUAL IN-LINE PACKAGE) switches in the HMTP board. (See

Fig. 54) The switches set to the left are ON... to the right are OFF. (See Fig. 55)

SW 1

Fig. 55 Setting DIP Switches

Each switch No. of the DIP switch functions as described below. So set these swit-

ches to suit your application or the computer’s specifications.

NOTE: Be sure that the POWER switch of the printer is turned off before changing

switch positions.

-I

-44-

5.1 Setting of DIP Switch No. 1

The DIP switch No. 1 consists of the following 8 pins.
A summary of the functions of the respective DIP switch pins and their preset condi­tions at the time of shipment are shown in Table 2.

Table 2 Functions and Conditions of DIP Switch No. 1

(1) SW1-1: Setting this pin to the ON position will cause the line spacing to be au-

tomatically set at 1/8 inch per line upon power application.

(2) SW1-2: Setting this pin to the ON position will cause the form length per page

to be set at 12 inches. The form length per page becomes 11 inches
when this pin is set to the OFF position.

(3) SW1-3 & 1-4: Combined use of these two pins permits selection of the number

of columns per line as shown in Table 3.

(4) SW1-5: Never set this pin to the OFF position. Always leave it in the ON posi-

tion.

(5) SW1-6: This pin is used to activate or inactivate the paper end detector. When

this pin is turned on, the paper end detecting function becomes invalid upon
power application and the Printer is allowed to operate even if it is out of paper.
With the Printer in this state, input of control code “ESC 9” will permit the paper
end detector to be activated again.

(6) SW1-7: This pin is used to select an international character set in conjunction

with DIP switch No. 2 upon power application.

(7) SW1 -8: When this switch is set to the OFF position, SLCT IN signal is not fixed

internally, thus permitting the Printer to be controlled from a host computer.
NOTE: This signal line is wired ORed with the pin No. 36 of the interface con-

nector. Therefore, to control the signal level with the pin No. 36 of the in­terface connector from the external CPU through TTL, etc., leave this DIP
switch pin to the OFF position.

-46-

(8) Character sizes and maximum column lengths can be specified as follows:

Table 3 Character Size and Maximum Column Length

~~

If you turn any of the above character sizes to the enlarged character print mode,
then the maximum column length will be reduce to half of them.

5.2 Setting of DIP Switch No. 2

The DIP switch No. 2 consists of the following 4 pins. A summary of the functions of
the respective DIP switch pins and their preset conditions at the time of shipment
are shown in Table 4.

Table 4 Functions and Conditions of DIP Switch No. 2

SW Pin No.

2-1

2-2
2-3

2-4

(1) SW2-1 & 2-2: Combined use of these two pins and SW1 -7 permit selection of

the international character set for U.S.A., France, Germany, England, Denmark,
Sweden, Italy, and Spain as shown in Table 5 upon power application.

(2) SW2-3: This pin is used to fix AUTO FEED XT signal internally. (Refer to the ex-

planation of control code “CR” in paragraph 3.1 (1) “WHAT IS THE MX-82”) This
signal line is wired ORed with the pin No. 14 of the interface connector. Therefo-

re, to control the pin No. 14 externally through TTL, etc., leave this DIP switch pin

to the OFF position,

(3) SW2-4: This pin is used to set the automatic skip-over perforation function.

(a) When this pin is set to the OFF position, the automatic skip-over perforation

function becomes valid. By this function, the paper automatically advances
to the first line of the next page when the remaining page length is 1 inch.

(b) When this pin is set to the ON position, the 1 inch automatic skip-over per-

foration function becomes invalid.
However, you can activate this function programmably. (described in detail
later.)

International character set
International character set

AUTO FEED XT signal

internally fixed or not fixed
1 inch skip-over perforation

Function OFF

See Table 5.
See Table 5.

Not fixed

Valid

ON

Fixed

Invalid

Factory-set

Condition

OFF

ON

-46-

5.3 Coding Tables

Appendix 4 shows all available codes when the Printer is set for operation with stan­dard coding by setting the DIP switch pins 1-7, 2-1 and 2-2 to all ON position, Table
5 shows International Character Set Designation according to the combination of
the DIP switch setting.

Table 5 International Character Set Designation

The above settings can be changed to any country character sets by inputting ESC R
+ n control codes. (Described later)
The above countries’ characters are addressed as per the following table.

Table 6 International Character Sets

24

7c
7D

7E

I$!

$!

1

-

:

”

$

6 0 6
ij

I3

- -

-47-

$

a a

b

,

--b-l

6

1

)

ii

i

5.4 Setting Sequence of Functional Specifications

The MX-82, MX-82 F/T have a choice of various functional specifications such as
amount of line spacing, form length per page, number of columns per line, automatic
skip-over perforation. etc. for selection under the control of both hardware (DIP swit­ches) and software (control codes) which is described later. In Figs. 56 through 59,
setting sequence of these functional specifications are illustrated.

1/8 inch

ESC0

c

4

118

inch

0

Fig. 55 Setting Amount of Line Spacing

-48-

ESC0 -

ESCCtn
ESCC+O+m

YES

12 inch

The skip-over perforation function, if previously

set, will be reset at this point.

Fig. 57 Setting Form Length per Page

-49-

96 columns

Normal
Emphasized

Power ON

(7

SI or

- ESCSI

print

4

DC2

0

I

Fig. 58 Setting Number of Columns per Line

print

-50-

l-inch skip-over
perforation function
not provided

ESCN+n

i-1

ESC

0

YES

NO

l-inch skip-over
perforation function
provided

t

Fig. 59 Setting Skip-over Perforation Function

-51-

This chapter describes the MX-82, MX-82
from the viewpoint of hardware and software.

The contents of the chapter are;

1. What is a dot matrix printer?

2. Definitions of some terms often used.

3. Control codes in the text mode

4. Control codes in the bit image mode

5. Print samples in the both modes
This printer has two different print modes. One is the text mode, another is the bit

image mode. You might be familiar with the text mode because an ordinary printer
has it.
In this mode a printer prints alphabets, numbers and some special symbols. On the
other hand, you probably do not understand the word “Bit Image”. In short the bit
image mode allows you to control each of the needles called “dot wires” freely and
programmably. As a result, you can get screen hard copies including graphic pat­terns defined arbitrarily or can specify any character and character formation except
pre-designed matrix. The full graphics or full dot image print may be easier to under­stand. But we define its print mode as “Bit Image”.

1. What is a Dot Matrix Printer?

As you know, many kinds of printers are marketed in the world, and they may be
classified by categories such as impact or non-impact printing method, line or serial
printing method and so on.

Broadly speaking, the EPSON MX-82 belongs to the following categories.
* Impact printer
* Dot matrix printer
* Serial printer with one line buffer
* Receive only printer

(This printer might be sorted to another category)

The impact printer means that it impacts ribbon with carbon and forms the char­acters you want.
The serial printer means that it cannot print data at the same time like a line printer
and the print speed will be slower. But if the printer has buffer memory, it can store
data for a while in the buffer memory and then print at almost the same time. The re­ceive only printer means that it cannot send data to a computer or another equip­ment except a limited number of interface signals, i.e., it does not have a keyboard.

F/T

(hereinafter refered to as MX-82)

-52-

The dot matrix printing method allows a printer to easily form any desired character,
It has a print head that contains 9 needles vertically and can create distinctive char­acters like with typewriter. In that sense it is one of the key features that the printer
has. EPSON’s MX-82 can control each needle programmably, expanding the ability
of the printer.

See next how the print head works and forms a character.
(1) Dot Matrix Printer

The print head contains 9 “needles” or “wires” vertically. Each dot wire is driven

by an electromagnet which fires when told to do so by the electronics inside the
printer.
Signals from the computer cause the appropriate dot wires to be fired from the
holder and to impact carbon, causing the character to be printed as a series of

dots.

Head guide

I

Dot wire

Head movement

-

direction

Fig. 60 Dot Wires

s

‘2=

Dot Wire #l-

Dot Wire #7 z

0.0..

-0
3

;.*.

:....

Head movement direction

Fig. 61 Formation of Character “E”

s

.­c

As an example (See Fig. 61) , to print the letter “E”, dot wires 1 through 7 are
fired first. They hit the ribbon. That makes marks on the paper. Then the head
shifts over a bit and dot wires 1, 4 and 7 are fired. In this manner, the character
“E” is formed.

-53-

This is called “Dot Matrix Printing”.

Dots are printed according to a pre-designed “Matrix” or “Grid” system, where
each letter, number and punctuation mark is formed by arrangement of dots. In
the above figure, the print head moves from left to right. Since the MX-82 is a bi­directional printing type, the head can also move from right to left to print char­acters

(2) Character and line spacing

Line spacing means the pitch from the top of dots that forms a character on a
line to the top of dots on the next line.
It is absolutely necessary to separate characters vertically for ease in reading
each sentence. Most typewriters and printers have a switch or lever to change
the line spacing (1/6” or 1/8”). The MX-82 also can do this of course. In addi­tion, you can set it programmably with some ESC codes with a range from 1/72”
to 85/72”.
See what happens when you set the line spacing to 1/8” and 1/6”.
Look at the following figures, (a) and (b). The line spacing, i.e. the pitch from the
top of upper “g” or “G” character to the top of the “g” or “G” on the next line is

1/8”. That corresponds to 9-dot skipping. If you type a “g” on the first line and a
“G” on the next line, the two characters will be close to each other. This is a little
bit hard to read in a long message including upper case characters and lower
case ones. In other uses, however, this line spacing is effective. You can under­stand its effectiveness when using the bit image mode.
On the other hand, with 1/6” line spacing, there is no problem even if upper case
characters and lower case ones are mixed in a message. In this case, a mini­mum of 1/24” line spacing is created between characters vertically. If you want
greater line spacing or less, input the ESC A control code.

-

Line spacing

(a) 1/8” line spacing

Fig. 62

12 dots
=1/w

Line Spacing

-54-

(b) 1/6" line spacing

3 dots

=

1124”

2. Definitions of Some Terms Often Used

Before looking at the printer in detail, some terms should be defined first so that you
can understand them more easily and in less time.
They are;
* ASCII code
* Escape codes
* “+” symbol
* 2, D and H

If you are already familiar with the above terms, skip these paragraphs.
(1) ASCII code

Characters in computer systems are represented by groups of bits. The various
groups of bits that represent the set of characters that are the “alphabet” of any
given system are called a “coding system”, or simply “code”.
Codes for representing the information vary in relation to both the number of bits
used to define a single character in the assignment of bit patterns to each parti­cular character.
In US ASCII (The United States of America Standard Code for Information Inter-

~41

>H

change) code the bit group (01000001)z

=

represents the character
“A”. The sending and receiving equipment must be programmed to acknow­ledge the code used in computer systems.

The MX-82 has 96 character set and control codes. In addition, it has an inter­naitonal character set as shown in a previous chapter. Those characters are put
in some addresses of the ASCII code table instead of the standard characters.
And those can be accessed by a particular control code or the DIP switch.
Alphabets, numbers and special symbols are addressed from

< 7

E

>

H and from

<

A0

>

H to

<

FE

>

H. So same characters are put in two differ-

<~O>H

ent addresses. The selection of which one to use is up to you if your machine
has an 8-bit data bus line.

(2) Escape codes

In a lot of control codes that the MX-82 has, you might be confused by the word
“ESCAPE”.
Some alphabetical letters and some numbers follow it. Each of them causes a
special function to the printer, i.e.
(a) To format a sentence.
(b) To do emphasized printing.
(c) To select paper end detector programmably.
(d) To set column length.
(e) To select an international character set.

(f) Others.

Generally, printer control codes, especially like “ESCAPE”, are not standardized.

Every computer and printer manufacturer applies its own meaning to such

codes.

to

-55-

The “ESCAPE” codes used in the MX-82 should not be confused with the es­cape key which some computers have. So be familiar with EPSON’S control
codes.

(3) “+” symbol

You will see “+” symbol often in the explanation or description of control codes
from now on.
This symbol is used for legibility only and may not be input in your actual pro­gram.

(4) 2, D (or Dec.) and H (or Hex.)

(

)z,

( )D and

<

>H

respectively represent binary, decimal and hexadecimal

numbers.

3. Control Codes in the Text Mode

With the MX-82 two standard operation modes are available. One is the Text Mode
which prints corresponding characters on normal ASCII coded inputs and the other,
the Bit Image Mode which permits printing of pictures and images in dot configura­tions. The Text Mode is described in this section while the Bit Image Mode is co­vered in the following section.
The MX-82 has been designed as a terminal unit capable of various software con­trols. When control codes are transferred to the Printer, respective functions go­verned by these codes such as form feed, line feed, etc. are executed immediately.

In order to permit the Printer to fully exhibit these functions, careful reading and thor­ough understanding of the following control codes are recommended. In this sec­tion, first the control codes in text mode are classified into groups. These two
modes are not fully independent of each other in that parameters set in the Text
Mode are also effective in the Bit Image.
(1) Print action codes

CR... Carriage return
LF... Line feed
VT... Vertical tabulation

FF... Form feed

(2) Paper formatting control codes

(a) Horizontally

ESC D, HT... Tabulation
ESC 0... Column length

(b) Vertically

ESC B. VT... Tabulation
ESC 0. ESC 2. ESC A... Line spacing
ESC C, FF... Form length, form feed
ESC N, ESC O... Skip-over perforation

-56-

(3) Character designation codes

SO, ESC SO, DC 4... Enlarged printing
SI, ESC SI, DC 2... Condensed printing
ESC E, ESC F... Emphasized printing
ESC R... International character set

(4) Other codes

DC 1, DC 3... Selection or deselection of the printer
ESC 8, ESC 9... Selection or deselection of the paper end detector
BEL... Bell
BS... Back space
NUL... Nul
ESC K, ESC L... Access code to Bit Image mode (described later).

3.1 Print action codes

(1) CR (Carriage return)

When the CR code is transmitted to the print buffer, all data stored in the print
buffer is printed. When AUTO FEED XT (Pin No. 14 of the interface connector) is
at “LOW” level, the paper is advanced one line automatically after the execution
of printing by the CR code.
NOTES: 1. When 96 columns of print data (including spaces) are continuously

received and the following data is valid and printable, the Printer au­tomatically begins to print the data stored in the print buffer. (In this
case, if AUTO FEED XT is at “LOW” level, the paper is advanced one
line after printing)

2. If no data precedes the CR code, or if all preceding data is “SPACE”,
the carriage assembly does not operate. Under this condition, if
AUTO FEED XT is at “LOW” level, only paper feeding is performed.

3. When all 96 columns of data are “SPACE”, the carriage assembly
does not operate. Under this condition, if AUTO FEED XT is at
“LOW” level, or if the DIP switch pin 2-3 on the control circuit board

is ON, only paper feeding is performed.

(2)

LF

(Line Feed)
When the LF code is input, all data in the print buffer is printed and the paper is
advanced one line.

NOTE: If no data precedes the LF code, or if all preceding data is “SPACE”, only

paper feeding is performed. For example, if the data is transferred in the
order of DATA + CR + LF, DATA will be printed by the CR code, and
when the Printer receives the LF code, it only carries out one line feed,
because no print data precedes the LF code.

-57-

(3) VT (Vertical Tabulation)

When the VT code is input, all data preceding this code is printed and the vertical

tabulation is made to a predetermined line position set by “ESC B” (up to 8 posi­tions). If no vertical tab position is set by ESC B, the VT code behaves like the LF
code. Therefore, the paper is advanced one line after printing.

(4)

FF

(Form Feed)

The FF code causes the Printer to execute the printing of all data stored in the

print buffer and advances the paper to the next predetermined Top of Form posi-

tion.

NOTES: 1. The Top of Form is determined when the POWER switch is turned

on or the INIT signal is applied.

2. If the form length per page is not set, one page length of form is re­garded as 66 lines with the DIP switch pin 1-2 on the control circuit
board set in the OFF position or 72 lines with the DIP switch pin

l-2 set in the ON position. (The amount of line spacing is governed
by the DIP switch setting at that time. When power is applied, the
amount of line spacing is set at 1/6 inch with the DIP switch 1-1
set in the OFF position or 1/8 inch with the DIP switch pin 1-1 set in

the ON position.)

3.2 Paper formatting codes

(1) HT (Horizontal Tabulation)

The HT code carries out the horizontal tabulation to a predetermined position

set by “ESC D” (up to 12 positions). The tab setting exceeding the column
length set by the DIP switch or ESC code will be ignored. In enlarged character
mode, the tab setting will not be effective and ignored.

(2)

ESC D + nl + nz + + nk + NUL

(I 5 (n)o i 132, k 5 12)

This code specifies the horizontal tab stop positions. “n” denotes column posi­tion where the print head stops. The first 12 tab stops per line are recognized

in the Printer, and subsequent tab stops are ignored. The tab stop positions can

be specified up to 96 columns in normal character mode and 159 columns in
condensed character mode. The excess tab positions, if specified, will be ig-

nored.

16ns96
IS ns

In enlarged character mode, the tabulation is not effective. To execute tabula­tion, the HT code should be input.
The NUL code should be input as the command for the termination of the tab

set sequence, and the lack of this code will cause incorrect data printout.

159 in condensed character mode

in normal character mode

-58-

r

1.In
[DATA]

[PRINT]

case

of

5th.

10th

-1

bg JKL a (LFI

AEC DEF

and 219 columns.

<5>H <A>H <15>Hm

GHI

ABC m DEF

JKL

lHTj GHl

2. In case

3. In case

4.In

of

lack

of

stop

position.

[DATAI

[PRINT]

[DATA]

[PRINT]

case of

[DATAI

[PRINT]

-1

<5>H <A>H m

@Ja

ABC DEF

of character data transferring

-1
/EiiJpJ

AECDEF

transferring two HT

IEsCDj <5>H <A>H <15>H m

EFGH m m

AbCD

ABC m DEF m GHI m JKL

GHI

JKL

over

next

<5>H <A>H <15>H m

GHI

codes

at a time.

EFGH

tab stop.

ABCDEF m GHI m JKL

J

KL.

ABED m i?@ACEl m

(3) ESC Q+n

The print column width can be specified by inputting ESC Q + n code. “n” repre-

sents the print column width to be specified in character size at the time of in­put.

12ns96
IS ns
lsnn48
lsn279

159 condensed character

normal character and emphasized character

enlarged character
enlarged-condensed character

-59-

(4) ESC A + n (for setting amount of line spacing)

This code specifies the amount of line spacing in the Line Feed, provided that

(n)o

must satisfy the condition: 1 s

“n” -

1 is equivalent to 1/72 inch paper advancement. Since the distance bet-

ween any two dot wires of the print head is 1/72 inch, any line spacing in incre-

ments proportional to the distance between the dot wires can be established.
NOTES: 1. When the POWER switch is turned on or INIT signal is applied to

the pin No. 31 of the interface connector, the line spacing is set at
either 1/8 inch or 1/6 inch according to the ON/OFF position of
the DIP switch pin 1-1 on the control circuit board.

2. The ESC A+ n code may be input at any position on a line. How­ever, once the code is input, the specified amount of line spacing
will remain unchanged until a code for new line spacing is set.

(Example) To specify the amount of line spacing at 7/72 inches.

~]AAAAAAAAAAAA

[DATA]

JCRIpl

(n)b

Z 85 (Decimal).

AAAAAAAAAAAA

AAAAAAAAAAAA

NOTE: <How to input “n”>

When “n” is actually transferred to the Printer as data, it is transferred in
the form of a 7-bit binary number.

In case of “ESC A + 24” to specify the amount of line spacing at 24/72

- 1/3 inch (24 - (0011000)2), actual output to the Printer is performed

as<lB>~ <41>~ <18>~inhexadecimalcodes.

Keep in mind that the method of input from the keyboard of a host com­puter is different, for which refer to the specifications of your host com­puter.

*Example: Input from the keyboard of the TRS-80 personal computer.

[LPRINT CHR$ (27); CHR$ (65); CHR$ (24)]

IEJILF]

mpj

-60-

(5) ESC 0

input of the ESC 0 causes the subsequent line spacing to be set at 1/8 inch.

(6) ESC2

Input of the ESC 2 causes the subsequent line spacing to be set at either 1/6
inch or 1/8 inch depending on the initial set condition of the DIP switch pin 1-1.

(7) VT (Vertical Tabulation)

See paragraph 3.1 (3) above.

ESC B +

(8)

(1 5 k5
This code specifies the vertical tab stop positions.
The first 8 valid tab stops per page are recognized in the Printer and subse-

quent tab stops are ignored.

A tab stop set at a line exceeding the form length specified by ESC C + n is ig-

nored. If the form length is set to 66 lines upon initial power application, the
last tab stop

Tab stop numbers must be received in incremental numerical order.
To execute tabulation, the VT code should be input. Once vertical tab stops are

established, the data will be valid until new tab stops are specified. If no tab
stop is set, the VT code behaves like the LF code. Therefore, the paper is ad-

vanced one line after printing.

Receipt of “ESC B” code causes the Printer to accept the following codes as tab

stop line numbers until the NUL code is input. The lack of the NUL code will
cause incorrect data printout.
The form length must be set by “ESC C + 0 + m” or “ESC C+n” code prior to set­ting tab stops. The VT setting is cancelled by input of “ESC C + n” code. There­fore, the tab setting should then be established again. Input of “ESC B” code fol-

lowed by only the NUL code cancels predetermined tab stops.

nc

+ n2 + + nk + NUL

8,nks nk+l)

(nk)n

should be less than 66.

(nk 5 nk+t).

DATA]

PRINT]

AAAAAiiA .,... 1st line

BBBbbBir . . . . .

CCCCCCC . . . .

DDDDDDD

4th

lines

6th

lines

. 10th lines

-61-

(9) FF (Form Feed)

See paragraph 3.1 (4) above.

(10) ESC C + n (for setting a form length)

ESC C + n

(n +

0), ESC C +

[O]H

+ m (for setting form length)

The “ESC C + n” codes specifies the form length which is determined by the

number of lines (n: 1 s

(n)n $

127 where the value of “n” is a positive numb-

er and must not exceed 127 lines). In other words, the maximum form length is

127 lines. The amount of line spacing when this code is input is a predeter­mined numerical value by ESC A+ n. When the form length is not programmed
by the ESC C + n code, one page is assumed as 66 lines with the DIP switch
pin 1-2 on the control circuit board set in the OFF position, or 72 lines with the

DIP switch pin 1-2 set in the ON position. The “ESC C +
fies the absolute quantity of form length in units of inches (1 d

[O]H

+ m” code speci-

(m)o 5

Therefore, even if the amount of line spacing is changed on the page, the abso­lute quantity of form length remains unchanged

“m”

denotes the form length in

inches.

NOTES: 1. With the ESC + n code, the form length can be defined by the

number of lines using the amount of line spacing set by the ESC A
+ n code. With the ESC C +
defined as an absolute quantity in unit of inches.

2. Input of “ESC C” code cancels the VT set by “ESC 6” and the
skipover perforation set by “ESC N’.

3.

< 0 > H denotes hexadecimal “00”.

(1 1) ESC N + n (n # 0) (for setting skip-over perforation)

The ESC N + n code is used to set the skip-over perforation, which specifies the
number of lines

“r-r”

to be skipped at the bottom of a page (n: 1 5
where the value of n is a positive number).
For example, if the last three lines of a page is to be skipped, the value of n
must be entered as “3”. Note that the value of n cannot be set greater than the
form length specified by the ESC C + n code.

When the current form length is changed by the input of the ESC C + n or ESC

C +

<O>H

+ m code again, the amount of skip-over perforation previously set is
cancelled. In this case, therefore, the ESC N + n code must be input again to
set the amount of skip-over perforation. When the amount of skip-over perfora­tion is not set by the ESC N + n code or the DIP switch pin 2-4 on the control
circuit board is OFF, skip-over perforation for 1 inch is executed.

[O]H

+ m code, the form length can be

(n)o 5

22).

127

-62-

(Example) 3-line skip-over perforation

[PRINT]

(12) ESC 0

This code cancels the skip-over perforation set by the ESC N + n code.

3.3 Character designation codes

(1) SO (Shift Out) (for enlarged characters)

When the SO code is input, all data that follows it in the same line will be print-

ed out in enlarged (double width) characters. This code is cancelled by the
printing operation or the input of “DC 4” code and can be input at any column
position on a line. Therefore, normal size and enlarged characters can be mixed
on the same line.

NOTE: With normal size and enlarged characters mixed on the same line,

BQBBc~!:4BQ
BBBQ(1!BBQ

mx!Bc~!:Jm!

when any enlarged character is at the 95th column position in terms
of normal size character, this position becomes the end position of the
line (i.e., “Print Buffer Full” position)

(at 1/6 inch line spacing)
Skip for 3 lines

End of previous page

Top of form position

Beginning of next page

I .

[DATA]

ABC m DEF lot

PRINT1 AE(CDEFGH1

2. [DATA]

ABCD m EFGH m m

PRINT1 OBCDEF’GH

SJKLMNOP

GHI ~

-63-

m

IJKL m

MNOP m m

(2) SI (Shift In) (for condensed characters)

When the SI code is input, all data that follows it will be printed out in condensed

characters. This code is cancelled by the input of “DC 2” code. The SI code can
be input at any column position on a line, but all characters/symbols on the line

containing SI code are printed out in condensed characters. Normal and con-

densed characters cannot be mixed on the same line.

When printing condensed characters, the data capacity of the print buffer will

become 159 columns per line (in terms of condensed size character). When the
SO code is received after the input of the SI code, condensed enlarged characters

(double width of condensed characters) can be printed. This condition is can-

celled by “DC 4” code or LF code, and the character size returns to “condensed”.

1. [DATA]
[PRINT]

2. [DATA]
[PRINT]

(3) ESC SO

This code functions the same as the SO code.

(4) ESC SI

This code functions the same as the SI code.

(5) DC 4 (Device Control 4)

The DC 4 code cancels the SO mode (enlarged character printig function).

[DATA]
[PRINT]

(6) DC 2 (Device Control 2)

The DC 2 code cancels the SI mode (condensed character printing function).

NOTE: The SO mode can be cancelled by the DC 4 code or LF code, but the SI

[DATA]
[PRINT]

LS

ABCDEFGHIJKL m

Eg

ABCDEF WI JKL

ABC m DEF m GHIJKL ERj [ifl

IIBCDEFGH

q

ABCDEFG

mode can be cancelled by the DC 2 code alone.

q

ABCDEFG

13

ABCDEF m

H

I

JKL

ABCDEF Iso]

H

I

KL

GHI

GHI a m

m

JKL m

m

m

JKLMN m

JKLMN

m

(7) ESC E (for emphasized characters)

The ESC E code causes the Printer to print emphasized characters.

Emphasized printing gives the character stronger impression on the paper.

This code can be input in any column position on a line, but all characters on the

line containing ESC E code are printed out in emphasized characters. The speed
of the head carriage reduces to 40 CPS while printing emphasized characters.

1. [DATAI -E]

LPR

INTI

2. [DATA]
[PRINT]

(8) ESC F

The ESC F code cancels the emphasized printing mode.

(9) ESC R + n (for international character set)

(0 S n 5 7)
When the “ESC R + n” code is input, all data that follows it will be printed out in a
country character set which is specified by “n”. It will be valid until specified by
other “ESC R + n” code.

“n” represents one of the following country character sets.

ABCDEFGHI

CIBCDEFGHI

m (ESCE]

ABCDEFGH

ICR]

ILF]

ABCDEFGHI m

I

m

As for specific code tables and character fonts, refer to Appendixes 4 and 5.

-65-

3.4 Other codes

(1) DC 1 (Device Control 1)

The DC 1 code places the Printer in the Selected state. It enables the Printer to
receive data.
With the Printer in the Selected state, if the DC 1 code is input during data
transfer, all data stored before the DC 1 code is ignored.

(2) DC 3 (Device Control 3)

The DC 3 code places the Printer in the Deselected state. In other words, it dis­ables the Printer to receive data. Once the Printer is put in the Deselected state

by the DC 3 code, the Printer will not revert to the Selected state unless the DC 1

code is input again.

NOTE: When the DC 1 and DC 3 codes are used, the DIP switch pin l-8 on the

control circuit board should be in the “OFF” position.

1. [DATA]
[PRINT]

2. [DATA]

[PRINT]

(3)

ESC 8

m

AAAAA m-j BBBBB ra CCCCC m B

AAFIAACCCCC

AAAAA [DC BBBBB m

CCCCC [DC /CRI m

bEIBEGJ

(Escape 8) (to ignore the Paper End detector)
The ESC 8 code makes it possible to transmit data even if there is no paper in
the Printer. Since this code causes the PE signal to be ignored, data may be

printed to the last page of the form without waste of paper. With the DIP switch
pin l-6 on the control circuit board set in the ON position, the Printer is placed in

the ESC 8 condition upon application of power.

(4) ESC 9 (Escape 9)

This code cancels the ESC 8 condition, and reinstates the PE signal.
Therefore, the Printer cannot receive data when there is no paper. With the DIP

switch pin l-6 set in the OFF position, the Printer is placed in the ESC 9 condi­tion upon application of power.

(5) BEL

(Bell)
When the BEL code is input, the buzzer sounds for about 1 second.
Arbitrary use of this code is recommended to arouse the attention of the opera-

tor.

-66-

(6) BS (Back Space)

The BS code cancels the data immediately preceding this code in the Text

Mode. In other words, one byte data stored prior to the BS code is cleared from
the print buffer, as though that data has not been transferred from the host com­puter. Note that this code is valid only in the Text Mode.

(7) NUL (Null)

The NUL code is regarded as the termination for tabulation setting sequence.
The lack of the NUL code would cause incorrect data printout.

(8) ESC K

Input of this code in the Text Mode causes the Printer’s operation mode to be
converted from Text to Normal-density Bit Image. Refer to paragraph 4.1, sec­tion 4, for details.

(9) ESC L

input of this code in the Text Mode causes the Printer to perform dual-density bit

image printing. Refer to paragraph 4.2, section 4, for details.

4. Control Codes in the Bit Image Mode

Most of the above-mentioned control codes are normally used in the text. mode.
Control codes associated with the Bit Image mode will be discussed next. Each
computer has its unique way of handling graphics.
For example, in the CBM computer there is a set of 64 special graphic characters
that can be used to draw and plot with. On the other hand, the APPLE II computer
has no graphic characters but a rich variety of graphic statements that allow you to
control any dot in a 280-by-193 screen matrix. As well as the latter “APPLE II”, the
MX-82 has no character generated graphics but allow you to control all the 8 nee­dles freely and programmably by means of the so-called “bit image”.

To do that you have to switch the printer from the text mode to the bit image mode

by inputting an escape code. This bit image mode expands the ability of the printer.

The printer enters bit image mode when ESC K or ESC L code is input, and utilizes a

raster scan technique that enables the printing of vertical columns of 8 dots across a
page during each pass of the print head. To receive bit image data, RAM (128 bytes)
of an IC on the control circuit board is used exclusively. When the bit image data re­ceived by the printer exceeds the RAM capacity, the printer will start printing bit
image data from the first-in data, so that the RAM may always be filled up with data
up to its capacity of 128 bytes.

-67-

4.1

Normal-density bit image mode setting by ESC K + nl +

nz

To convert the printer’s operation mode from Text to Normal-density Bit Image, the

“ESC K + nl +

nz”

code must be input. (Here, the sign “+” is inserted for the purpose
of legibility only and should not be input in actual operation.) Namely, when ESC

(<

1

B>

H and K

(< 4B>

H) codes and data

ni

and nz are input, the Printer recognizes
the data following the “ESC K” as the bit image data. nl and nz are the hexadecimal
numbers each consisting of 2 digits which define the amount of the bit image data
to be transferred.

r-n

represents the low-order two digits while nz represents the high-order two digits.
In the normal-density bit image processing, the maximum number of dot positions
printable per line is 576. Therefore, the values of ni and nz specified in excess of
576 dot positions are ignored and printing of the bit image data after the 576th dot
position is not guaranteed.
Mixing of text data and bit image data is possible on the same line.
NOTE: Assign values to nr and

nz,

respectively as follows.

n2

I I i I 1 I i

MSB

212

215

216

213

2”

210

LSB

29 28

MSB
2’

26

ni

LSB

25

24 23

22

2’

20

As shown above, nl is set hexadecimally as low-order bytes and nz as high-order
byte.

(Ex. 1) Input data

Text

(20

characters)

ESC K

n = 576 Bit-image data

Next data

20 characters in text mode correspond to 120 bit-image positions (20 x 6 - 120).
So the remaining printable positions in Bit-image mode are 456 (576 - 120 - 456).

If 576 data are input as bit-image mode characters, the first 456 data can be printed
but the remaining 120 data are ignored and thus not printed.

(Ex. 2) Input data

n’2,

n’i

Data D

1 Bit-image data

Data A

ESC K ni nz

n2,

ni

q

Data B

Bit-image data j Text data

Data C ESC K n’i n’z

/.

1

{

576 bit-image positions

-68-

Printing

Text data A

Bit-image data B

576 bit-image positions

Text data C

Bit-image data

D

(Ex. 3) Input data

nz.

ni

t

Printing

I

(Ex. 4) Bit image data transfer by standard BASIC program
To check for proper coversion to the Normal-density Bit Image mode, execute the

following program.

[PRINT]

-69-

4.2 Dual-density bit imagemode setting by ESC L + nl +

When the ESC (< 1

B>

H) and L

(<

4C

>

H) codes followed by data

nz

nc

and n2 are input,
the printer’s operation mode is converted from Text to Dual-density Bit Image.
The transfer sequence of bit image data is the same as with the ESC K (normal-den­sity bit image printing), but bit image printing can be performed in twice the dot den­sity in the horizontal direction as with the ESC K. In other words, bit image data can

be printed in 1152 dot positions per line, thus permitting to produce denser graphic

data.

NOTE: Mixing of normal-density bit image with dual-density bit image on a line is at

your option, as well as mixing with normal size characters in the text mode.

-70-

4.3 Relationship between data and dot wires

Fig. 63 shows the relationship between the Bit Image data and the dot wires in the
print head. You can control arbitrary 8 dot wires in the print head.

LSB

Input

data

Dot wire

l -

04

NOTE:
In the Bit Image mode,
the 9th dot wire cannot
be used.

l ­0 .-

l ­0 -

&

Fin. 63 Relationship between Data and Dot Wires

If a bit is “1“, the print head fires. If a bit is “0”, the print head does not fire. For ex-

ample, assume that data are given as follows;

B7=0
B6=0

B5=1

B4=0

B3=0
B2=0
Bl-1
BO=O

<50>,,

where a box with

<22>,,

“0”

denotes the bit “1” and a blank box denotes the bit “0”. Ac­cording to Appendix 4, Code Table, you can define (00100010)2 as < 22

(01010000)2as <50>H.

As you can see the first 4 bits are defined from column and the second 4 bits

(0101)2- <5>H,and (0000)2-

<O>H.

67=0
B6=1
B5=0
B4=1
B3=0
B2=0
Bl-0
BO=O

>

H and

-71-

4.4 How to obtain nl and

In the MX-82 Printer, you have to send the amount of data by nr + n2 in hexadecimal
numbers following the ESC K or ESC L. If the amount of bit image data is 300, then

nt

and nz may be derived as follows;

nl

= (Amount of data) MOD 256

= 300 MOD 256

=

<44>D

=

<2c>H

n2 =

INT (Amount of data/256)

= INT (300/256)

=<l>D

-<ol>H

You can also use Appendix 4, code Table, to find the corresponding hexadecimal
numbers to the decimal numbers. The schematic of data transfer sequence in the

Bit Image mode is shown in Fig. 64.

ESC code

CHR$(27)

I

t

n2

“L” code

CHR$(76)

I

Number of data n1
n, = Data MOD 256
CHR$(n,

1-

1

1 1

Numberof

n2 =
CHR$(n,

H

INT

data n2 1

(Data/2561

)

L-t

Fig. 64 Data Transfer Sequence in Bit Image Mode

-72-

4.5 Programming examples

(1) Dual-density bit image printing

Fig. 65 Example of Graphic Pattern Formation

NOTE: The most significant bit (MSB) of the bit image data corresponds to the dot

wire at the uppermost position.

For example, to print a graphic data as shown in Fig. 65, a program such as shown
below must be executed. However, this program has been developed using stan­dard BASIC language. If extended BASIC is to be used, the program must be
changed according to the features of the language.

In addition, if data is to be transferred through an interpreter of BASIC, etc., the data
transfer rate is extremely slow. In such a case, it is recommended to effect the data
transfer through machine language, etc.

-73-

(3) Difference between ESC K and ESC L

The normal-density mode is accessed with ESC K. The dual-density mode is ac-

cessed with ESC L

MSB

-0

-

Direction of print head movement

The print head fires space

/

between normal dot positions

-

half the speed in normal-

(Print speed reduces to

density printing.)

LSB

I

0

-0

a) Normal density

b) Dual density

Fig. 66 Normal-Density and Dual-Density Modes

NOTE: Print alignment under the friction feed.

EPSON is carefully applying printer mechanisms of better quality for MX-82
F/T. However, due to the nature of friction feed in which paper may slip, it is
not available to use the bit image mode while feeding the cut sheet or the
roll paper in the MX-82 F/T. If the accuracy of line feed is critical, the fanfold
paper must be used.

-75-

(4) Example of CRT screen dump hard copy

This print example is made using APPLE II® computer and the
demonstration diskette.

Fig. 67 Examples of Bit Image Printing

-76-

(5) Example of expression of brightness using the Bit Image Mode

(Ex.) Expression of brightness using the bit image mode

4

(Ex.) Expression of dot density

a....

A:

0:

c:

l oe*a

@*.*a

@em*.

l ee*o

me@.@

l oae*

Data will be transmitted in order of <AA> H and then < 55 >
(8-dot line spacing)

Data will be transmitted in order of < FF> H and then
(8-dot line spacing)

Data will be transmitted in order of two <CC >H and

<33>11. (8-dot line spacing)

Fig. 68 Expressions of Brightness

5 6

H

<oo>H

then two

-77-

MAINTENANCE

1. Preventive Maintenance

Preventive maintenance for the MX-82 and MX-82 F/T consist basically of clean­ing. The Printer should be cleaned with a soft brush to remove paper dust and parti­cles after every three months of use. The exterior surface of the Printer can be
cleaned by using a mild detergent and water solution.

2. Parts Replacement

(1) General

Owing to the sophisticated nature of the circuitry and mechanisms utilized in the

MX-82, MX-82 F/T, operator’s troubleshooting is logically obliged to be limited
to certain easily recognizable symptoms and cures. If a Printer malfunction other
than the print head unit should occur, the operator should contact the store from
which the printer was purchased.

(2) Print head

In case of a print head trouble or a worn dot wire, replace the print head unit as

described below. (See Fig. 69)

NOTE: Be sure to replace the print head after it has cooled.

STEP 1. Turn the power off.

2. Take off the printer lid and cartridge ribbon.

3. Turn the head lock lever clockwise and remove the print head.

4. Pull the head cable out straight while steadying the head connector on
the terminal board.

5. Put a new head on the carriage assembly and replace the head lock
lever.

6. Insert the head cable into the head connector carefully.
NOTES: 1. Inadequate connection may cause malfunctioning of the

head.

2. The carriage assembly should not be moved without the
print head mounted on the carriage.

Print Head

, Terminal Board

Print Head Unit

1

Head Lock

Lever

Carnage Assembly

(Side View)

Fig. 69 Replacement of Print Head

Head Connector
‘Be sure to hold this

connector firmly
pull the head cable

out

straight

‘Take hold of the
cable at the point

izicated by

o

and apply force in
either of the direc­tions indicated by
arrow c) to push in
or pull out the head

cable.

ariows

lo

-79-

SPECIFICATIONS

(1) PRINT METHOD:
(2) PRINT SPEED:
(3) PRINT DIRECTION:

Serial impact dot matrix
80 CPS
Bidirectional with logic seeking
Unidirectional in the bit image mode

(4)

NUMBER OF PINS IN
HEAD: 9

(5) LINE SPACING:

4.23 mm (1/6”) or 3.18 mm (1/8”)
selectable by DIP SW, or

1/72” to 85/72” programmable

(6) PRINTING CHARACTERISTICS

Matrix:
Character Set:

9x9
Full 96-character ASCII with descenders,
plus 8 international character sets

(7) PRINTING SIZES

Selectable by DIP SW or programmable

Normal:
Enlarged:
Condensed:
Condensed Enlarged:

(8) MEDIA HANDLING

Paper Feed:

Adjustable sprocket pin feed (and/or friction feed for

MX-82F/T)
Paper Width Range:
Fanfold paper:

MX-82 MX-82 F/T

4” to 10”

(101.6mm to 254mm) (101.6mm to 254mm)
Roll paper:

Cut paper sheet:

Copies:

One original plus two carbon copies (total thickness

not to exceed 0.3 mm (0.0 12”)

Paper Path:

Rear

(9) INTERFACES

Standard:

Optional:

Centronics-style 8-bit Parallel

RS232, IEEE 488. etc.

(10) INKED RIBBON

Color:

Type:

Life Expectancy:

Black
Exclusive cartridge
3 million characters

Characters

per inch

12

6

19.9

9.9

Maximum

characters

per line

96
48

159

79

4” to 10”

8.5” f 0.12”

(215.9 f 3 mm)

8.3” to 8.5”
(210mm to 216mm)

-80-

SPECIFICATIONS (continued)

(1 1) MCBF:
(12) ENVIRONMENTAL CONDITIONS

Operating Tempera­ture Range:
Operating Humidity:

(13) POWER REQUIREMENT

Voltage:

Current:
Power Consumption:

(14) PHYSICAL CHARACTERISTICS

Height:

Width:

Depth:

Weight: 5.5 kg (12 Ibs.) 7.0 kg (15.4 Ibs.)

Specifications subject to change without notice

5 x 106 lines (excluding print head)

5 to 35’C (41 to

10 to 80% non-condensing

115V.60Hz

220/240V, 50 Hz

1 Amp maximum
100 VA maximum

MX-82 MX-82F/T

107 mm (4.2”) 133 mm (5.2”)
374 mm (14.7”) 374 mm (14.7”)
305 mm (12.0”)

95’F)

305 mm (12.0”)

-81-

APPENDIX 1

Construction of MX-82 and MX-82 F/T

The EPSON MX-82 and MX-82 F/T dot matrix printers consist of the following three
major functional blocks.
(1) Printer Mechanism
(2) Control Circuit Board
(3) Power Circuit
These three blocks are housed in a plastic case and are connected to one another.

1.1 Printer mechanism

The printer mechanism has been developed by EPSON Shinshu Seiki Co., LTD., with
the latest technology in the precision and electronic industry fields.
The printer mechanism contains two stepper motors. One is to move the print head
to the next print column position, and the other is to advance the paper.

(1) Stepper motor for head carriage

The stepper motor for head carriage is controlled under LSI “8041” called “slave
CPU”. The CPU knows the current printing position at any given time, and the
print head is stopped at the last printing position. Then, the CPU seeks the shor­test travel way to the next print line.
This feature and bidirectional printing enable the Printer to perform the logical
seeking function which minimizes the head travel time to the next print line.

(2) Stepper motor for paper feed

Paper is fed by the stepper motor, like the head carriage. One complete rotation
of the stepper motor corresponds to 1/3 inch paper advance. In the MX-82,

MX-82 F/T printers the operator can select any paper feed length under soft-

ware control.

(3) Print head

The print head has 9 dot wires to form 9 x 9 dot matrix characters.
9 wires form more legible characters than those formed by 7 wires. The print
head for the printer mechanism is quite compact.

1.2 Control circuit board

In this paragraph, the printer LSI circuitry is outlined. The control circuit diagram is
shown in Fig. A1 -1, and the driver circuit diagram in Fig. A1 -2.

-83-

Fig.

Al

-1

Control Circuit Diagram

1.3 Power circuit

The power circuit generates 5V DC for the logic circuit, and 24V DC to energize the
solenoids of the print head and two stepper motors.

1.4 Printer initialization

Printer initialization is accomplished in either of the two ways described below.
(1) initialization takes place automatically each time the primary AC power source is

interrupted and reapplied (i.e., by turning the Power Switch off and on).

(2) Initialization may be initiated remotely by activating the INIT signal to the parallel

intmfara rnnnartnr

Thic

Iinn chmnlrl ha A&cm hw a Tfl r&war nr it= ~n~~i~alant

9 X

2SD986

-

HI

D

H:

LFA 0

LFC

- LFA

0

-

LFD

Fig. A1 -2 Driver Circuit Diagram

-86-

APPENDIX 2 Parallel Interface

Both the MX-82 and MX-82 F/T include a parallel interface as the standard equip­ment, and this paragraph describes the parallel interface.
(1) Specifications

(a) Data transfer rate:
(b) Synchronization:
(c) Handshaking:

(d) Logic level:

(2) Connector

Plug: 57-30360 (AMPHENOL)

It is recommended that interface cables be kept as short as possible.

(3) Connector pin assignment and descriptions of signals.

Connector pin assignment and descriptions of respective interface signals are

provided in Table A2-1.

Table A2-1

Connector Pin Assignment and Descriptions of Interface Signals

1000 CPS (min.)
By externally supplied STROBE pulses.
By ACKNLG or BUSY signal.
Input data and all interface control signals are compa­tible with the TTL level.

12

11

28

29

30

ACKN

BUSY

PE

LG

out
out

-I

out

These signals represent information of the
1st to 8th bits of parallel data respectively.
Each signal is at “HIGH” level when data
is logical “1”

Approx.
data has been received and that the printer

is ready to accept other data.

A “HIGH” signal indicates that the printer
cannot receive data. The signal becomes

“HIGH” in the following cases:

1. During data entry

2. During printing operation

3. In OFF-LINE state

4. During printer error status.
A “HIGH” signal indicates that the printer

is out of paper.

-87-

and “LOW’

5~s

pulse. “LOW” indicates that

when

logical

Table A2-1 (cont’d)

;

14 / -

15
16 -

17

16 -

19to30

31/-lm

32

33
34

-

35

36

lmi

-

-

-

-

-

NC
OV

%nosas­NC
GND

ERROR

GND

NC

SLCT IN In

In

-

-

P

out

-

Description

This signal indicates that the printer

is in the selected state.

With this signal being at “LOW” level,
the paper is automatically fed one line
after printing.
(The sig

nal level can be fixed to “LOW”
with DIP
control circuit board.)

Not used.

Logic GND level.

Printer chassis GND.
In the
logic GND are isolated from each other.

Not used.

E;fTED-PAIR

When the level of this signal becomes
“LOW”, the printer controller is reset to
its initial state and the print buffer is
cleared. This signal is normally at “HIGH”
level, and its pulse width must be more
than

The level of this signal becomes
“LOW” when the printer is in -

1. PAPER END state

2. OFF-LINE state

3. Error state
Same as with Pin Nos. 19 to 30.
Not used.
Pulled up to +5V through

resistance.
Data entry to the printer is possible only

when the level of this signal is “LOW”.
(Internal fixing can be carried out with
DIP SW pin l-8. The condition at the
time of shipment is set “LOW” for this
signal.)

SW pin 2-3 provided on the

printer,

the

chassis GND and the

RETURN signal GND

50~

at the receiving terminal.

3.3k.G

NOTES: 1. “Direction” refers to the direction of signal flow as viewed from the

printer.

2. “Return” denotes “TWISTED PAIR RETURN” and is to be connected at
signal ground level.

As to the wiring for the interface, be sure to use a twisted-pair cable for

each signal and never fail to complete connection on the Return side.

To prevent noise effectively, these cables should be shielded and con-

nected to the chassis of the host computer and the printer, respective­ly.

-88-

3. All interface conditions are based on TTL level. Both the rise and fall
times of each signal must be less than 0.2

4. Data transfer must not be carried out by ignoring the ACKNLG or BUSY
signal. (Data transfer to this printer can be carried out only after con-

firming the ACKNLG signal or when the level of the BUSY signal is

“LOW’.)

(4) Data transfer sequence

Fig. A2-1 shows the sequence for data transmission.

BUSY

ACKNLG

DATA

STROBE

Fig. A2-1 Parallel Interface Timing

p.s.

Relations among the ON LINE switch, SLCT IN signal, DC l/DC 3 code and inter-

face signals are shown in Table A2-2 below.

Table A2-2 Relations among ON:LINE. SLCT IN, DC1 /DC3 and Interface Signal

-89-

NOTES: 1. In Table A2-2, it is assumed that as soon as the Printer receives data, it

sends back the ACKNLG signal, though this data is not stored in the
print buffer. In this status, the Printer is waiting for the DC 1 code for
normal entry.

2. In the above table, it is also assumed that no ERROR status exists other

than that attributable to the OFF-LINE position of the ON-LINE switch.

In the ERROR status, the Printer is not in the Selected state (SLCT ­“LOW”).

3. The DC 1 /DC 3 code is valid under the condition that the DIP switch pin

l-8 is OFF. Namely, the level of SLCT IN at the pin No. 36 of the inter­face connector is “HIGH”. With SLCT IN at “LOW level, the Printer is al­ways placed in the Selected state, and the DC 1/DC 3 code is not valid.

4. When power is applied, if SLCT IN is at “LOW’ level or the DIP switch
pin l-8 is OFF, the Printer is regarded as in the Deselected state.

-90-

I

Hex. o

No.

I

,

2

3

4

5,617

I”S(

I .

l-l Ic

’

I

8'9!A

-

I
I

6

c

D

APPENDIX 4 Character Fonts

(Hex Code

20

28

38

)

21

-

ti i i iJ

29

42

32

23

28 2c

38

3c

24

25

20

3E

46

26

2E

27

3F

48

60

49

4A 48

52

-92-

4c

40

4E

AF

,.

58

59

5A

50 5c

5D

5E 5F

69 69

78 79

NOTE: Numbers rep

6A

7A

resent Hex.

6B 6C

liiiil

73

78

. .

7c

6D

7D

7E

-

93

-

FRANCE

40

5B

5c

5D‘

78

7c

7D

7E

GERMANY

ENGLAND

23

DENMARK

SWEDEN

24

5c

5B

5c

5D

5D 70

78

5c

5D

70

liiiil

7D

60

-

7E

70

ITALY

58

7c

7D

5D

60

7E

78

7c

7D

7E

SPAIN

23

55 5c

50

78 7c

-96-