Epson MX-80F, MX-80T User Manual

MX-80F/T

EPSON DOT MATRIX PRINTER

Operation Manual

r

3

EPSON

P8093033-1

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.

TRS-80 is the registered trademark of Radio Shack,

a Division of Tandy Corporation.

TABLE OF CONTENTS

INTRODUCTION
INSTALLATION.

1. Contents of Carton.

2. Unpacking.

2.1. Unpacking steps

2.2. Repacking steps.

3. Installation of the Printer

4. Cartridge Ribbon Setting.

5. Separator Installation.

6. Dismounting of Tractor Unit.

7. Paper Loading

7.1. Fanfold paper.

7.1.1. Loading of fanfold paper

7.1.2. Removal of fanfold paper.

7.1.3. Column layout on fanfold paper.

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
OPERATION.

1. Switches and Indicators

1.1. Switches

1.2. Indicators

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2. Buzzer...........................

3. Paper End Detector

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4. Self-Test.........................

5. Construction of MX-80 F/T

5.1. Printer mechanism.

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5.2. Control circuit board.

5.3. Power circuit

5.4. Printer initialization

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6. Setting of DIP Switches.

7. Parallel Interface.

8. Coding Tables

9. Control Codes

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-(1)-

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

1. Preventive Maintenance. ..............

2. Parts Replacement
SPECIFICATIONS

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SUMMARY OF CONTROL CODES. ........

APPENDIX ..............................

Assembly Instructions on Roll Paper Holder

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49

-(2)--

LIST OF FIGURES

Fig. 1

Fig. 2
Fig. 3
Fig. 4
Fig. 5

Fig. 6

Fig. 7

Fig. 8
Fig. 9

EPSON MX-80 F/T Dot Matrix Printer
Contents of Carton.
Removal of Shipping Screws
Removal of Printer Lid.

Cartridge Ribbon Setting.

Cartridge Ribbon Setting.

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Examples of Correct and Incorrect Ribbon Setting.
Separator Installation
Dismounting of Tractor Unit,

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Fig. 10 Mounting of Tractor Unit
Fig. 11 lnsertion of Fanfold Paper.

Fig. 12 Raising of Sprocket Lock Levers
Fig. 13 Engagement of Paper Feed Holes on Feeding Pins.

Fig. 14 Printer with Fanfold Paper Set Completely
Fig. 15 Example of Paper Arrangement.

Fig. 16 Top of Form Position Setting.

Fig. 17 Loading of Roll Paper (1)
Fig. 18 Loading of Roll Paper (2)
Fig. 19 Loading of Roll Paper (3)
Fig. 20 Loading of Cut Paper Sheet.
Fig. 21 Adjustment of Inserted Paper Position
Fig. 22 Alignment of Side edges.
Fig. 23 Form Position Setting Mark

Fig. 24 Print Area.

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Fig. 25 Setting of Cut Paper Sheet.
Fig. 26 Printer with Cut Paper Sheet Set Completely
Fig. 27 Gap Adjustment.

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Fig. 28 Switches and Indicators on Control Panel
Fig. 29 Control Circuit Diagram.
Fig. 30 Driver Circuit Diagram
Fig. 31 Location of DIP Switches
Fig. 32 Parallel Interface Timing
Fig. 33 Replacement of Print Head.

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LIST OF TABLES

Table 1 Interface Signals in Paper-Out Status
Table 2 Functions and Conditions of DIPSwitch 1.
Table 3 Functions and Conditions of DIPSwitch 2.

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22
27
28

Table 4 Special Characters/Symbols Available for Selection

(using DIP Switch Pins 2-1 and 2-2).

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Table 5 Connector Pin Assignment and Descriptions of Interface Signals.
Table5 (cont.)
Table 6 Coding Table (Standard)
Table 7 Coding Table (TRS-80)
Table 6 Special Characters/Symbols
Table 9 DC 1 /DC3 and Data Entry.

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-(4)-

INTRODUCTION

The EPSON MX-80 F/T Dot Matrix Printer is a highly versatile, general-purpose and
computer-grade printer featuring 80 CPS bi-directional printing with logical seeking
capability and 9 X 9 dot-matrix character formation. The MX-80 F/T accepts the

ASCII 96 codes and codes for special characters/symbols (e.g.. b; C
accepts codes for 64 graphic patterns.
Characters can be printed in any desired size - enlarged, condensed, emphasized,
normal, etc. The one-chip microprocessor is engaged in performing all functions of
the Printer and the two built-in stepper motors of the MX-80 F/T control the carriage
and paper feeding functions respectively. Therefore, versatile software controls,
such as horizontal and vertical tabs, and form feed are at your disposal.

The MX-80 F/T is capable of S-way paper handling such as fanfold paper,roll paper

and cut paper sheet.
In addition, various interface options are available to permit handshaking with most
personal computers.

2).

It also

Fig. 1.

EPSON MX-80 F/T Dot Matrix Printer

-1-

INSTALLATION

1. Contents of Carton

The MX-80 F/T and standard accessories are as shown in Fig. 2. Upon unpack-

ing, if you notice any listed contents missing or evident damage. contact the
store where you purchased the MX-80 F/T as soon as possible.

1

Power Cord (European Type)

MX-80 F/T Dot Matrix Printer

MX-80 F/T

1.
Separator

2.

Cartridge Ribbon

3.

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

5. MX-80 F/T Operation Manual

Fig. 2 Contents of Carton

-2-

Operation Manual

1
1

1

1
1

]

2. Unpacking

Before removing the MX-80 F/T from the carton, check the box for evidence of
shipping damage or mishandling. If such evidence is present, notify the carrier
immediately.

2.1. Unpacking steps

Unpacking steps are as follows:

STEP 1. Open the carton.

STEP 2. Remove accessories.
STEP 3. Remove the MX-80 F/T by holding its underside and lifting it straight

up with the packing material attached.

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

venient flat surface.
STEP 5. Take off the packing material carefully.
STEP 6. Remove the vinyl cover.

2.2. 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-80 F/T requires reshipment in the future.

3. Installation of the Printer

(1) Operating site selection

When installing the MX-80 F/T, observe the following instructions.

Place the Printer on a bench, tabletop or any other convenient flat sur-

(a)

face with enough room for the separator in the back of the Printer.
NOTE: Rubber feet are provided to prevent the marring of the surface on

which the MX-80 F/T is placed.

Avoid operating the MX-80 F/T in places where it may be exposed to

(b)

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

NOTE:

Connect the power cord to an outlet separated from those connected

(c)

to noise-generating equipment, such as large-power motors, refrigera­tors, etc.
Do not subject the Printer to temperatures below 5°C

(d)

35°C (95’F) during operation, to sudden changes in temperature, or to
extreme shock.
Avoid use of the Printer in humid locations or in the vicinity of heat

(e)

generating sources such as heater, etc.

Greasy dust may cause the malfunction of the print head.

-3-

(4O’F)

or above

(2) Removal of protective paper for paper end detector

The MX-80 F/T 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-80 F/T is to be reshipped.
remember to return it to the original position.

(3) Removal of shipping screws

The purpose of the shipping screws is to protect the MX-80 F/T against any
damage that may be caused by shocks or vibrations during transportation.
Therefore, before operating the MX-80 F/T, remove the screws as de-

scribed below. (See Fig. 3.)
STEP 1. Open the printer lid.

STEP 2. Remove with a screwdriver, the two shipping screws visible inside

the printer mechanism.

Shipping Screws

Fig. 3 Removal of Shipping Screws

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

<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.
Step 2. Push the printer lid toward the right and pull up its left side. (See

Figs. 4 (1) and (2).)

-4-

(1) Standard

Printer Lid

(2) Option

Fig. 4 Removal of Printer Lid

NOTE: The printer lid shown in Fig. 4 (2) is an optional accessory.

-5-

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

is touching.

STEP 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. 5.)

Fig. 5 Cartridge Ribbon

STEP 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. 6.)

Fig. 6 Cartridge Ribbon Setting

-6-

NOTES: 1. Incorrect setting of the ribbon may cause it to come off. (See Fig. 7.)

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

Ribbon Mask

Incorrect

Incorrect

Correct

Fig. 7 Examples of Correct and Incorrect Ribbon Setting

5. Separator Installation

The separator of the Printer contributes to smooth paper feeding. Set the sepa-

rator by inserting its edge into the two holes located at the rear part of the

paper feeding mechanism. (See Fig. 8.)

Fig. 8 Separator Installation

-7-

6. Dismounting of Tractor Unit

The tractor unit of the MX-80 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. 9.

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

Lock lever

Fig. 9 Dismounting of Tractor Unit

To install the tractor unit, hook the notches of the tractor frames onto the shaft
shown in Fig. 10 and then push down the tractor unit.

Fig. 10 Mounting of Tractor Unit

-8-

I

7. Paper Loading

7.1. Fanfold paper

7.1.1. Loading of fanfold paper
The MX-80 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.

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

Fig. 11.)

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

the platen.

STEP 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.

STEP 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.

11.)

I

Scale

Fig. 11

STEP 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.)

STEP 7. After the leading edge of the paper has emerged from the Printer, pull

it out gently to some length.

Insertion of Fanfold Paper

1

-9-

STEP 8. Raise the two sprocket lock levers to loosen, and adjust the sprocket

pin position to the paper width. (See Fig. 12.)

Paper Holding

Fig. 12

,

STEP 9. Engage the paper feed holes of the paper on the feeding pins, push the

Cover

ket Lock Lever

Raising of Sprocket Lock Levers

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. 13.)

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

tive paper feed holes of the paper.

ocket Lock Lever

Fig. 13 Engagement of Paper Feed Holes on Feeding Pins

-10-

STEP 10. Put the printer lid on the Printer. (See Fig. 14.)

I

Fig. 14

Printer with Fanfold Paper Set Completely

NOTE: When the MX-80 F/T is to be used on a desk or a bench, arrangement

of the fanfold paper in parallel with the MX-80 F/T as shown below

will permit the paper to be folded in an accordion style.

Course of

Paper

Fig. 15: 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.1

-11-

7.1.3. Column layout on fanfold paper
When fanfold paper of from 4” to 10” in width is supplied with the MX-80 F/T,
the graduations on the scale can be used as the indexes of print column posi­tions (1~80). 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. 16.)

In case of feeding one page of fanfold paper by operating the MX-80 F/T by the

input of FF code, the abovementioned adjustment is effective.

Matchmark

77 mm

r

Fig. 16 Top of Form Position Setting

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7.2. Roll Paper

7.2.1. Roll paper holder
EPSON offers the roll paper holder as an optional accessory for the MX-80 F/T.
See Appendix for the assembly instructions on Roll Paper Holder.

7.2.2. Loading of roll paper
The MX-80 F/T accommodates a roll of single ply paper measuring

8.5f0.12

in. in width with a 1 in. core. To load it, observe the following procedure.
STEP 1. Raise the printer lid.

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

Fig. 17.)

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

the platen. (See Fig. 17.)

STEP 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. 17.)

NOTE:

The paper guide roller contributes to smooth paper feeding.

STEP 5. Insert the end of the roll paper between the frame and the plastic roller

of the separator. (See Fig. 17.)

STEP 6. Push the paper into the insertion slot between the paper guides at the

rear part of the printer mechanism. (See Fig. 18.)
NOTES:

1. Be sure to pass the paper beneath the upper paper guide.

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

STEP 7. Lock the release lever and push the scale back into position. (See Fig.

19.)

STEP 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.

STEP 9. Put the printer lid on the Printer.

-13-

7.3. Cut paper sheet

Roll Paper

Fig. 18 Loading of Roll Paper (2)

Roll Paper

Manual Paper Feed Knob

Fig. 19 Loading of Roll Paper (3)

7.3.1. Loading of cut paper sheet

The MX-80 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.
STEP 2. Unlock the release lever. (See Fig. 20.)
STEP 3. Pull the scale toward the front of the Printer to detach the scale from

the platen. (See Fig. 20.)

STEP 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.

STEP 5. Insert the cut paper sheet between the paper guides at the rear part of

the printer mechanism.

NOTE: The paper sheet can be installed without removing the separator.

-14-

I

STEP 6. Lock the release lever.
STEP 7. While turning the manual paper feed knob clockwise, confirm that the

paper advances straight up. (See Fig. 21.)

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. 22.

Fig. 20 Loading of Cut Paper Sheet

Manual Paper
Feed Knob

Fig. 21 Adjustment of Inserted Paper Position

-15-

Fig. 22 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. 23.)

, l/s

l/4

1 i.

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I

I

Fig. 23 Form Position Setting Mark

The print area on the cut paper sheet (when printing it with the tractor
unit installed) is shown in Fig. 24.

210 mm (8.3”)-216 mm (8.5”)

-We

1

28.6

or

30.2

mm,

kzs:.-

CDE

305

mm

(’

2”)1 Max.

Fig. 24 Print Area

-16-

4,

+...--

;

Letter Size Paper---+

rA4SizePaperpf

/4

Fig. 25

I

Fig. 26 Printer with Cut Paper Sheet Set Completely

Setting of Cut Paper Sheet

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

control (ESC 8; refer to page 39) provided printing is left off with­in 7.5 mm from the paper bottom edge.

2. If the paper is set on the line marked 1/4as shown in Fig. 25, 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.

STEP 8. Push the scale back into position and put the printer lid on the

Printer. (See Fig. 26.)

-17-

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.

(1) Move the head adjusting lever (located on the left frame of the Printer) for-

ward or backward to adjust the gap between the head nose and the platen.

(See Fig. 27.)
Forward: To widen gap.
Backward: To narrow 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

Set the lever to the 4th step.
Set the lever to the 7th step.

Position of adjusting lever

(3) Should printed characters become faint due to the use of the Printer for an

extended period, move the head adjusting lever backward (in

the@direc-

tion) by one step. (See Fig. 27.)

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

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

9. Power Connection

The EPSON MX-80 F/T Dot Matrix Printer is capable of operating on the follow­ing three types of AC power.

(1) 115V AC, 60Hz
(2) 220V AC, 50Hz
(3) 240V AC, 50Hz

Before connecting the MX-80 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 “OPERATION” 5.4. If your MX-80 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-80 F/T.

-18-

Head Adjusting Le

@Backward _

Head Adjusting Lever

Fotward @

Fig. 27 Gap Adjustment

4th step

7th step

-19-

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. 28 for the control panel.)

Power Switch

Fig. 28 Switches

1

.1 Switches

POWER 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.

ON LINE SW: When this switch is depressed, the Printer enters the ON-LINE

mode and can be utilized in conjunction with a host computer.
Depressing the switch again will set the Printer in the OFF-LINE
mode. The switch does not function while the Printer is actively
engaged in printing. The Printer is automatically placed OFF­LINE 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.
When the ON LINE switch is pushed while data is being re­ceived, all data received up to then is printed immediately. This
is helpful to avoid data loss. If data has been transferred into the
print buffer without any print command such as CR, LF or VT
code, no data can be printed out on the paper. However, if the
ON LINE switch is turned off, the data stored in the print buffer
is printed out. Therefore, no data is lost when the Printer
becomes OFF-LINE.

and Indicators on Control Panel

ContyPanel

-20-

FF

SW:

(Form Feed)

LF

SW:

(Line Feed)

1.2. Indicators

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. (See “INSTALLATION” 7.1.4.)

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 on, the line
spacing is initialized at 1/6 inch.

The line feed operation is prohibited while the Printer is actively

engaged in printing.

POWER:
READY:
PAPER OUT:

ON

LINE:

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.

2. Buzzer

The buzzer is located inside the Printer case, and sounds under the following
conditions.
BEL code:

Error status: It sounds intermittently for about 30 seconds when the Printer

It sounds for about 3 seconds when the Printer receives BEL
code.

falls into error status.

NOTE: Setting of the DIP switch pin 1-6 (on the control circuit board)

OFF stops the buzzer from sounding under the above condi-

tions.

3. Paper End Detector

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 statuses.

I

-21-

Table 1 Interface Signals in Paper-Out Status

When the Printer falls into paper-out status, the buzzer sounds intermittently
for 30 seconds to alert the operator. After the buzzer stops, 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. There is another way to start the Printer again
when it falls into paper-out status. Set new paper in the Printer, and turn the
POWER switch off and on again, or apply the
In this case, however, all previously established data such as TAB, line spacing,
etc. are erased.

4. Self-Test

The MX-80 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.

m

signal.

789: ;

: i

; ~~=>?@ABCDEFGHIJKLMNOFQRSTUVWXYZK\l~’~

~:=3?@ABCDEFGHIJKLMNOPQRSTUVWXYZC\3~~~~

(=>?@fiBCDEFGHI

(=>?@ABCDEFGHI

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.

JKLMNOPQRSTUVWXYZK\l.“. ‘abcde

JKLMNOPQRSTUVWXYZC\l”_ “abcdef g

‘abcdefgh

-22-

‘abed

(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.)

l Example of printing’?”

“Z”=[5. A]~=(0101

1010)

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

5. Construction of MX-80 F/T

The EPSON MX-80 F/T Dot Matrix Printer consists of the following three major
functional blocks.

(1) The model 3310 printer mechanism
(2) Control circuit board

(3) Power circuit
These three blocks are housed in a plastic case and are connected to one
another.

5.1. Printer mechanism

The model 3310 printer mechanism has been developed by Shinshu Seiki with
the technology in the precision and electronic industry fields amassed through

its long association with SEIKO, manufacturer of the world-famous SEIKO
watches.
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 bi-directional 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-80 F/T, the operator can select any paper feed length under soft­ware control (described in detail later).

(3) Micro print head

The micro 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 3310 printer mechanism is quite compact.

-23-

5.2. Control circuit board

In this paragraph, the printer LSI circuitry is outlined. The control circuit
diagram is shown ‘in Fig. 29, and the driver circuit diagram in Fig. 30.

Fig. 29 Control Circuit Diagram

-24-

HI

Hz

9

X 2SD986

0

0

m

I

H, 0

H,

0

“s 0

H, 0

H, 0

He

0

H9 O-

D

1

>

D

m

D

Fig. 30 Driver Circuit Diagram

-25-

5.3. 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.

5.4. 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 interface connector. This line should be driven by a TTL driver or its
equivalent.
The minimum reset pulse width is 50 psec at the receiving terminal. Upon
application of the initialization signal, the following sequence of events
take place in the Printer.

(a) The print head returns to its home position.
(b) The Printer is automatically placed ON-LINE, unless it is out of paper.
(c) The print buffer is cleared.
(d) The line spacing is set at 1/6 inch.
(e) The form length per page is set to 66 or 72 lines.

NOTE: The form length of 72 lines per page is applicable to only the version

*marked with identifier code “M72” on the rear side of the lower case

of the Printer.

(f)

Any stored vertical or horizontal tab stop positions are cleared.

(g) The character print-width logic is reset to the normal state.

-26-

8. Setting of DIP Switches

There are two DIP switches on the control circuit board. In order to suit the

user’s specific requirements, desired control modes are selectable by the DIP
switches. The functions of the switches and their preset conditions at the time
of shipment are as shown in Table 2 (DIP Switch 1) and Table 3 (DIP Switch 2).

DIP Switch 2 DIP Switch 1

Pin No.

1
2

3

4

5
6

7

8

Fig. 31

Table 2 Functions and Conditions of DIP Switch 1

Function

Not applicable

CR

Buffer full

Cancel code

Delete code
Error

Character generator

Graphic patterns select
Japanese syllabary select

t

SLCtlN rig&

Fixed internally
Not fixed internally

Print & Line Feed

Print only

{

Print & Line Feed
Print only

{

Valid
Invalid

Valid

Invalid

Buzzer

Location of DIP Switches

ON

Print only

Print only

Invalid

Invalid

Sounds

Japanese

syllabary

select

Fixed

-27-

OFF

Print &
line feed

Print &
line feed

Valid OFF

Valid ON

Does not sound

Graphic
patterns
select

Not fixed ON

Factory-set

Condition

ON
ON

ON

ON

OFF

Table 3 Functions and Conditions of DIP Switch 2

Pin
No.

1

Selectors of special characters/symbols -

-

fSee Table 8)

2

AUTO

3

4

NOTE: When DIP Switch pin 2-4 is set to the “ON” position (for TRS-80 mode), all the

other pins of the DIP switches 1 and 2 will not function irrespective of these
ON/OFF positions.

FEED

XT signal

Coding table

select

Table 4 Special Characters/Symbols Available for Selection

Function

Fixed internally
Not fixed internally

1

TRS80
Standard

(using DIP Switch Pins 2-1 and 2-2)

ON OFF

Not
fixed

-

-

Fixed

TRS-8@ Standard

Factory-set

Condition

ON
ON

OFF

OFF

SW2-1

ON

ON
OFF ON
OFF

I

SW 2-2

ON

OFF

1

OFF

Country
U.S.A.
France
Germany
England

I

7. Parallel Interface

The MX-80 F/T includes a parallel interface as the standard equipment, and
this paragraph describes the parallel interface.

(1) Specifications

(a) Data transfer rate: 1000 CPS (max.)
(b) Synchronization:
(c) Handshaking: By ACKNLG or BUSY signals.
(d) Logic level: Input data and all interface control signals are

/

(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 5.

By externally supplied STROBE pulses.

compatible with the TTL level.

-28-

Table 5

Connector Pin Assignment and Descriptions of Interface Signals

STROBE

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” and “LOW” when logical “0”.

A “HIGH” signal indicates that the printer

pulse to read data in. Pulse width

-29-

(The signal

level can

be fixed to “LOW”

Signal
Pin No.

18

9

to30

-

31

32

33
34
35

36

Return
Pin No.

!

I

-

-

-

-

-

-

Signal

NC

GND

lNlT

ERROR

GND

NC

SLCT

IN

-

--

Table 5

I

Direction

In

out

-

In

(cont.)

Description

Not

used.

TWISTED-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

its pulse width must be more than 56~s at
the receiving terminal.

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

1. PAPER END state

2.

OFF-LINE

3. Error state
Same as with Pin Nos. 19 to 30.

Not used.

Pulled up to

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 1-8. The condition at the time of
shipment is set

1

RETURN

state

+5V

“LOW’

“HIGH”

through

for this signal.)

signal GND level.

level, and

4.7KD

resistance.

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

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 con­firming the ACKNLG signal or when the level of the BUSY signal is
“LOW”.)

-30-

/.Ls.

(4) Data transfer sequence

Fig. 32 shows the sequence for data transmission.

r

Fig. 32 Parallel Interface Timing

8. Coding Tables

(1) Table 6 shows all available codes when the Printer is set for operation with

standard coding by setting the DIP switch pin 2-4 to the OFF position. This

DIP switch pin is factory-set to the OFF position.

(2) When the DIP switch pin 2-4 is turned ON, the Printer behaves as a com-

pletely compatible printer to the Tandy Personal Computer TRS-80. The
available codes in this case are shown in Table 7.

Note that all the other pins of DIP switches 1 and 2 will not function
irrespective of their ON/OFF positions whenever the DIP switch 2-4 is

turned ON for TRS-80 mode.

(3) Table 8 shows Special Characters/Symbols which are selectable by the DIP

switch pins 2-1 and 2-2 as described in paragraph 6 above.

-31-

8
9

A

B

D

E

F

1000

1001 HT
1010 LF
1011

VT

1101 CR
1110 so
1111 SI

CAN (

ESC +

8

H X h

)

9 I Y i Y

5

: J Z j

K

;

=

.

>

/

? 0 -

t k

L

M

N

\

i

3 m )

..x

1

L

n *

--0

x

C

VT

DEL SI

CAN

HT

z

LF

I

I

ESC p

1

CR

so

’

:

16.5 charalinch

5 charalinch
print

-ESC 6 :

-ESC 8 :

-ESC A :
.ESC B :

6 lines/inch line
feed

8 lines/inch line

feed

Long line mode

Short line mode

I

i

1
1

ti

1101

D
E
F

CR GS -

1110
1111

RS
us

=

.

/

M

3

m

N

>

?

.+ n

0

-

0

*

DEL

Table 8 Special Characters/Symbols

[781~

{

[7c1

I-I

f

[7D1~

[7E]

H -

}

cl

6

”

1

6

ii

P

I

I

j

9. Control Codes

Various kinds of control codes are contained in Tables 6 and 7.
These control codes are recognized by the MX-80 F/T, and the Printer performs
specified functions upon receipt of these codes.
The following are descriptions of respective control 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) is at “LOW” level or DIP switch pin 2-2
is ON. the paper is advanced one line automatically after printing.)

NOTE: When 80 columns of print data (including spaces) are continuously re-

ceived 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 or DIP switch pin 2-3 is ON, the paper is

advanced one line after printing.

-34-

(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 will be printed by the CR code, and when the Printer receives the LF
code, it only carries out one line feed.

DATA-+CR+

(3) VT (Vertical Tab)

When the VT code is input, all data preceding this code is printed. And the
paper is advanced to the line position set by “ESC B” (described later.) 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 carries out the printing of all data stored in the print buffer and

advances the paper to the next predetermined Top of Form position. The

Top of Form is determined when the POWER switch is turned on or the
signal is applied.
If the form length per page is not set by “ESC C+n,” it is regarded as 66 or
72 lines.

NOTE: The form length of 72 lines per page is applicable to only the version

marked with identifier code “M72” on the rear side of the lower case of the
Printer.

This code always initializes the printing of the data stored in the print
buffer.

(5) SO (Shift Out)

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

LF.

l@j’i=i

1.

[DATA]
[PRINT]

2. [DATA]

ABC m DEF -1

UBCOFIFGHI

ABC0 m

PRINT1 AbCDEF’GH

I JKLMNOF

GHI jCRi

EFGH

(CRI B IJKL (so( MNOP (CR1 ml

m

-35-

I

(6) SI (Shift In)

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.
When printing condensed characters, the data capacity of the print buffer
will become 132 columns per line.
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 cancelled by “DC 4” code, and the character size
returns to “condensed.”

1. [DATA]
[PRINT]

2. [DATA]
[PRINTI

(7) DC 4 (Device Control 4)

The DC 4 code cancels the SO mode.

[DATA]
[PRINT]

(8) DC 2 (Device Control 2)

The DC 2 code cancels the SI mode.

[DATA]
[PRINT]

(9) HT (Horizontal Tab)

The HT code carries out the horizontal tabulation.
If there is no tab position set, this code is ignored. The tab stop positions
are set by “ESC D+n” (described later).

q

ABCDEFGHIJKL m

m

ABCDEFGHI JKL

Ax a DEF Isb] GHIJKL (CRI

fiBCDEFGH1 ,YKL

m ABCDEF m

GHI

a

ABCDEFG H I JKL

m ABCDEF m

GHI lCRj m

ABCDEFG H I

J

t:::LMN

(LF]

JKL

(CRI m

m

JKLMN m

m

-36-

(10) CAN (Cancel)

Upon the input of the CAN code, all data previously stored in the print

buffer is cancelled.
Therefore, this code is regarded as the print buffer clear command. This
code clears the print buffer, but control codes (excluding the SO code) are
still valid even if the CAN code is transferred.
The validity or invalidity of the CAN code is selectable by the DIP switch
pin l-4 on the control circuit board.

(11) DEL (Delete)

This code functions the same as the CAN code.
The validity or invalidity of the DEL code is selectable by the DIP switch

pin 1-5 on the control circuit board.

(12) DC 1 (Device Control 1)

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

(13) 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, DIP switch pin l-8 should be in

the “OFF” position.

1. [DATA]
[PRINT]

m

AAAAA a

AAAcIAccccc

2. [DATA] AAAAA B
[PRINT]

bEBBb

BBBBB m

-37-

BBBBB m

CCCCC m

CCCCC a m

m

m

Relations among the ON LINE switch, SLCT IN signal, DC l/DC 3 code and
interface signals are shown in Table 9 below.

Table 9

DC 1/DC 3 and Data Entry

NOTES: 1. In Table 9, 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. The DC l/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.” When SLCT IN is “LOW,” the DC l/DC
3 code is not valid.

(14) NUL (Null)

The NUL code is regarded as the termination for tabulation setting
sequence (described in detail later).

(15) BEL(Bell)

When the BEL code is input, the buzzer sounds for about 3 seconds.

(16) Escape (ESC) control

(a) Escape numerical control

Input of an “ESC” code followed by an ASCII numeric code permits

each of the following functions to be performed.

1) ESC 0(Escape 0)

Receipt of an “ESC” followed by ASCII code “0” causes the line

spacing to be set at 1/8 inch. Input of the ESC 2 code

ormsignal

to the interface connector or turning the power off and on again
causes the line spacing to return to 1/6 inch.

-38-

2) ESC 1 (Escape 1)
Receipt of an “ESC” followed by ASCII code “1” causes the line
spacing to be set at 7/72 inch. Input of the ESC 2 code or INIT sig­nal to the interface connector or turning the power off and on
again causes the line spacing to return to l/6 inch.

3) ESC 2(Escape 2)
Receipt of an “ESC” followed by ASCII code “2” causes the line
spacing to be set at 1/6 inch. When the POWER switch is turned
on, the line spacing is set at initial 1/6 inch. The ESC 2 code is also
a command to execute “ESC A+n” modes (described later).

4) ESC 8(Escape 8)
The ESC 8 code makes it possible to transmit data even if there is
no paper in the Printer.
This code should be transmitted before the Printer runs out of
paper.
After transmitting this code, when the Printer runs out of paper,
the PE signal of the interface connector turns to High level; the

ERROR signal remains at High level.

5) ESC 9(Escape 9)
This code cancels the ESC 8 condition.
When the power is turned on, the Printer is initialized into ESC 9
status. Therefore, the Printer cannot receive data when there is no
paper.

6) ESC SI
This code functions the same as “SI.”

7) ESC SO

This code functions the same as “SO.”

(b) ESC alphabetic control

Receipt of an “ESC” code followed by ASCII code “X” (alphabetic code)
permits each of the following functions to be performed.
NOTE: “n” represents a 7-bit binary number, and the most significant bit is

not treated as data. “+” is inserted for the purpose of legibility only,
and should not be input in actual operation.

-39-

1) ESC A+n

This code specifies the amount of line spacing in the Line Feed.

1

<<n >

lo<85

(Decimal): “n” is, a binary number.
“n”=1 is equivalent to 1/72 inch paper advancement.
Since the distance between any two dot wires of the print head is

1/72 inch, any line spacing in increments proportional to the dis­tance between the dot wires can be established.
The ESC A code is the command only to store spacing data into
the memory. In other words, even if spacing data was transferred

into the memory, the Printer does not actually carry out the line
spacing in accordance with the spacing data. To execute the line
spacing in accordance with the stored data, the ESC 2 code
should be followed. Namely, the ESC 2 code is considered as the
execution command for the line spacing.

[DATA] AAAAAAA m

CCCCCCC a m

EEEEEEE m [LFI

[PRINT]

kr%%M#r

BBE~EmBEl

ccccccc

DDDDDDI)

EEEEEEE

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”, actual output to the Printer is performed
as <1B> H <41> H <18> H in hexadecimal code.

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 com-

puter.

/LFI

BBBBBBB jCRj m jm

DDDDDDD

FFFFFFF m

116 inch = 12 steps/72

I.

1 I3

inch = 24

steps/72

(ESC1 (CR] m

B

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

-40-

2) ESC

B+nl+n2+. +nk+NUL

(ld<n>lo<66,1dkd64,nkdnk+l)

This code specifies the vertical tab stop positions.
The first 64 valid tab stops per page are recognized in the Printer;
subsequent tab stops are ignored.
A tab stop set at a line exceeding the form length is ignored. Tab
stop numbers must be received in incremental numerical order. To
execute predetermined tab stop positions, 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 advanced
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+n” code prior to setting
tab stops.

Input of “ESC 8” code followed by only the NUL code cancels pre-

determined tab stops.

[DATA]

[PRINT]

(ESC/ <4>H <6>~ <A>H m

AAAAAAA m BBBBBBB lm CCCCCCC

C?li?lAUUfW 1st line

BBBHBE(E! . . . 4th

CCCCCCC

6th

lines

lines

DDDDDDD . . . . 10th lines

-41-

/VTI DDDDDDD

3) ESC C+n

(ld<n>1&66)

This code specifies the form length per page.
The form length is determined by the number of lines (=“n”). The
amount of a line spacing at this point is a predetermined numeri-

cal value by “ESC A+n.” When the form length is not program­med, one page is assumed as 66 or 72 lines. Prior to setting the

vertical tab position, the form length should be set.

4) ESC

D+nl+nz+. +nk+NUL

(19<n>lo9127.

This code specifies the horizontal tab stop positions. The first 112
tab stops per line are recognized in the Printer, and subsequent
tab stops are ignored. Tab stop numbers must be received in

incremental numerical order.

If a tab stop position of higher value than 80 is received in normal

character printing mode, all horizontal tab functions after 80 col-

umns are ignored.

To execute tab stop positions, the HT code should be input. The

HT code is ignored when the horizontal tab position has not been

programmed.

The NUL code should be input as the command for the termina-

tion of the tab set sequence, and the lack of this code will cause

incorrect data printout.

1.

Incase of 5th. 10th and 21st columns.

(DATA1

[PRINT]

2.In

case of lack

I

DATA1

[PRINT]

3.In

case

I

DATA1

[PRINT)

4. In case
[DATAI

LPR

INTI

-1

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

!EiJm

UBC DEF GHI

of stop position.

[e:g <5>H <A>H m

ABC

of

character data

~

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

AEKDEF GHI

of transferring

two HT codes at a time.

m

<5>H <A>H <l5>H m

/EKJm

AEtCD

DEF

transferring

ksl12)

GHIJKL

over

next

ABC m

J K L.

ABC m

tab

DEF m

stop.

AECDEF m GHI m

J

KL

ABED

EFGH

DEF m

GHI

IHT] pm

GHI m

JHT] JKL a a

m

JKL

JKL /=I pj

EFGH

-42-

5) ESC E

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

Emphasized printing gives the character a stronger impression on
the paper.
This code can be input in any column position on a line.

The speed of the head carriage reduces to 40 CPS while printing

emphasized characters.

1. [DATA] lm

PRINT1

2. [DATA]
[PRINT]

ABCDEFGHI

EIBCDEFGHI

m -1

FIBCDEFGH

6) ESC F

The ESC F code cancels the emphasized printing mode.

7) ESC G

The ESC G code causes the Printer to perform the double printing.

Double printing is carried out in the following manner.

1) A character is printed.

2) The paper is advanced by 1/216 inch.

3) The print head prints the same character again.
In this way, the character becomes bold.

[DATA] (ESC]

ABCDEFGHl

PRINT1 ABCDEFGHI

(CR1 m

ABCDEFGHI m

I

(CRI m

m

I

8) ESC H

The ESC H code cancels the double printing mode.

-43-

MAINTENANCE

1. Preventive Maintenance

Preventive maintenance for the MX-80 F/T consists 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-80 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 which is
not covered in this section, the operator should contact the store from
which the MX-80 F/T 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. 33.)

NOTE: Be sure to replace the print head after it has cooled.
STEP 1. Take off the printer lid and cartridge ribbon.
STEP 2. Turn the head lock lever clockwise and remove the print head.

STEP 3. Pull the head cable out straight while steadying the head connec-

tor on the terminal board.

STEP 4. Put a new head on the carriage assembly and replace the head

lock lever.

STEP 5. 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.

-44-

Head

Print Head Unit

Cable

!

Terminal Board

/

Head Lock

(Side View)

Fig. 33 Replacement of Print Head

Head Connector
‘Be sure to hold this

connector firmly to
pull the head cable

out straight.

‘Take hold of the
cable at the point

ijjdicated

either of the direc­tions indicated by
arrow M to push in
or pull out the had
cable.

by arrows

e

and apply force in

-45-

SPECIFICATIONS

(1) PRINT METHOD:
(2) PRINT SPEED:
(3) PRINT DIRECTION:
(4) NUMBER OF PINS IN

HEAD:
(5) LINE SPACING: 4.23 mm (1/6”) or programmable
(6) PRINTING CHARACTERISTICS

Matrix:

Character Set:

Graphic Character:
(7) PRINTING SIZES

Normal:

Enlarged:
Condensed:
Condensed Enlarged:

(8) MEDIA HANDLING

Paper Feed:

Paper Width Range

Fanfold paper:

Roll paper:
Cut paper sheet:

Paper Path:

(9) INTERFACES

Standard:

Optional:

(10) INKED RIBBON

Color:
Type :

Life Expectancy:

(11) MCBF:
(12) ENVIRONMENTAL CONDITIONS

Operating Temperature

Range:

Operating Humidity:

Serial impact dot matrix

80 CPS
Bidirectional with logical seeking

9

9x9
Full 96-character ASCII with descenders. plus 9
international characters/symbols

64 block characters

Maximum

Characters

per inch

10

5

16.5

8.25

Friction feed or adjustable sprocket feed

selectable manually

101.6 mm (4”) to 254 mm (10”)

215.9 mm
210 mm (8.3”) to 216 mm (8.5”)

Rear

Centronics-style 8-bit Parallel

RS232. IEEE 488

Black
Exclusive cartridge
3 million characters
5 x

10s

5 to 35°C (41 to 95°F)

10 to 80% non-condensing

(8.5”)*3

lines (excluding print head)

mm (0.12”)

characters

per line

80

40

132

66

-46-

SPECIFICATIONS (continued)

(13) POWER REQUIREMENT

Voltage: 115V. 60 Hz

220/240V, 50 Hz
Current: 1 Amp maximum
Power Consumption: 100 VA maximum

(14) PHYSICAL CHARACTERISTICS

Height: 133 mm (5.2”)
Width:
Depth: 305 mm (12.0”)
Weight:

I

Specifications subject to change without notice.

374 mm (14.7”)

7.0 kg (15.4 Ibs.)

-47-

SUMMARY OF MX-80 F/T CONTROL CODES

Control code data is sent to the MX-80 F/T along with character code data via the

input data lines. Control codes are sent as data, and are interpreted as instructions
by the Printer. The following is a summary of control codes and control code

sequences recognized by the MX-80 F/T.

(1) Print action codes

Mnemonic Decimal Hex. code

CR
LF

13 0D
10

0A

(2) Paper movement codes

FF

ESC C
HT

ESC D

VT

ESC B

ESC 0 27. 48 1B. 30
ESC 1
ESC 2

ESC A 27. 65

12 0C

27. 67
9 09

27,68

OB

27. 66

27. 49

27. 50

1B,43

1B.44

11

1B. 42

1B. 31
1B. 32

1B. 41

Performs the printing of a line stored in the print buffer.
Performs the printing and advances the paper one line.

Advances the paper vertically to the next predetermined Top
of Form position.

Specifies the form length per page. Execution command IS FF.
Advances the print head to the next predetermined tab stop

position in a horizontal direction.
Specifies the horizontal tab stop positions. Execution com-

mand is HT.
Advances the paper to the next predetermined tab stop posi-

tion in a vertical direction.
Specifies the vertical tab stop positions. Execution command

is VT.
Causes the line spacing to be set at 1/8 inch.
Causes the line spacing to be set at 7/72 inch.
Causes the line spacing to be set at 1/6 inch. This code is also

a command to execute the predetermined line spacing mode.
Specifies the amount of line spacing in the Line Feed. Execu-

tion command is ESC 2.

Function

(3) Character designation code

SO

DC 4

SI

DC 2
ESC E
ESC F
ESC G
ESC H

14

20
15
18

27. 69

27. 70

27. 71

27. 72

OE

14
OF
12

1B. 45 Causes the Printer to print emphasized characters.

1B. 46

1B. 47 Causes the Printer to perform double printing.
1B .48

(4) Other codes

NUL
BEL
DC 1
DC 3

ESC 8

ESC 9

CAN

DEL

0

7
17
19

27, 56

27. 57
24

127

00
07

11
13

1B. 38

1B. 39
18

7F

Instructs the Printer to print subsequently received charac-

ters in double width size.

Cancels the SO (enlarged character) mode.
Instructs the Printer to print characters in condensed size.
Cancels the SI (condensed character) mode

Cancels the ESC E mode.

Cancels the ESC G mode.

Terminates the tabulation setting sequence.

Causes the buzzer to sound for about 3 seconds.
Places the Printer in the selected (data receivable) state.
Places the Printer in the deselected (data not receivable)

state.
Permits data to be transmitted even If there is no paper in the

Printer.
Cancels the ESC B condition.
Deletes from the print buffer all previously entered printable

characters. (Print buffer clear command)

Functions the same as ‘CAN’.

-48-

APPENDIX

Assembly Instructions on Roll Paper

Holder

1. Confirm that all the component parts shown in Fig. 1 are contained in the
carton.

Part name

A

Stand.
Shaft

B
C

Base

Fig. 1 Component

D
E
F
G

Arc
Screw grommet.
Tension lever. . .
Guide roller . .

Parts of Roll Paper Holder

plate

bearing.

2. Fit each arc bearing D into stand A as shown in Fig. 2.

Fig. 2Fitting of Arc Bearings into Stand

-49-

. . .
. .

QW

. 1

. .

.

1
1

2
2
1
2

3. Put base plate C on stand A and secure it by inserting two screw grommets
E to the corresponding square holes as shown in Fig. 3. In this case, take
note of the direction in which base plate C must be placed on the stand.

I

4. Set tension lever F on stand A as follows:
4-1: Hook the tension lever on the nose of stand A as shown in Fig. 4-1.
4-2: While pulling the tension lever up, put the wire into the hole as shown
in Fig. 4-2.

5. Fig. 5 shows the Roll Paper Holder in the assembled state.

Fig. 3

Fig. 4-1

Mounting

of Base Plate on Stand

Fig. 5 Assembled Roll Paper Holder

-50-

6. Set the Roll Paper Holder to the Printer by aligning the base plate with the
knots located at the bottom of the printer.

Fig. 6

7. Fig. 7 shows how to insert shaft B into the core of the roll paper.

I

I

8. Fig. 8 shows the Printer with the Roll Paper Holder mounted thereto.

Fig. 7

Insertion of Shaft B into Roll Paper Core

Fig. 8

Printer with Roll Paper Holder

-51-

FEDERAL COMMUNICATIONS COMMISSION

RADIO FREQUENCY INTERFERENCE

STATEMENT

“Warning: This equipment has been certified to comply with the limits
for a Class B computing device, pursuant to Subpart J of Part 15 of FCC

Rules. Only computers certified to comply with the Class B limits may be
attached to this printer. Operation with non-certified computers is likely
to result in interference to radio and TV reception.”

This statement will be applied only for the printers marketed in the U.S.A.

EPSON

SHINSHU SEIKI CO., LTD

EPSON OVERSEAS MARKETING LOCATIONS
EPSON AMERICA, INC. (L.A.)

23844 Hawthorne Blvd.,
Torrance, Calif. 90505
Phone: [phone]
Telex: (25)9103447390

EPSON DEUTSCHLAND GMBH

Am Seestern 24
4000

Dtisseldorf

F.R. Germany HA2 OEB U.K.
Phone: [phone] Telex: (41)8584786

11, South Harrow

EPSON AMERICA, INC. (N.Y.)

98 Cutter Mill Road
Great Neck, New York

Phone: [phone]

Telex: (25)510223-0743

EPSON U.K. LTD.

Sherwood House 176 Northolt Road

Phone: [phone] Telex: 8814169

PRINTED IN JAPAN

81.02-10