Epson FX Series User manual

•

I-'

r •

EPSON

FX,RX,MX

PRINTERS

Product

Support

Supplement

The

Centre

for

Computing

History

www.CompulingHistoiy.org.uk

EPSON

FX,

RX,

PRINTERS

PRODUCT

SUPPORT

SUPPLEMENT

600P89074

FEBRUARY

1986

Prepared

by:

Curriculum

Development

Service's

XICTMD/Service

Training

XEROX

1986

Xerox

Corporation

Allrights reserved

Epson

FX.

RX,

and

are registered trademarks of

Epson

America,

Inc.

PRINCIPLES

OPERATION

WIRING

DATA

EPSON

PRINTERS

CONTENTS

INTRODUCTION

Introduction

How

use

this

Manual

PRINCIPLES

OPERATION

1.1 Principles of Operation 1-1

WIRING

DATA

2.1

Introduction

2-1

2.2

FX-85/185

2-2

2.3

FX-80/100

2-6

2.4

RX-80/100

2-10

\JiSy

2.5

MX-80/100 2-13

INTRODUCTION

This

manual

contains

detailed

principles

operation,

electrical

description,

and wiring information for the

Epson

FX,

RX,

and

family

of dot

matrix

printers.

should

only

used

by Xerox Service

Center

leaa

technicians

service

representatives.

HOW

USE

THIS

MANUAL

Start

with

the

Product

Support

Manual. If

the

Printer

has

unique

problem

that

the

PSM

does

not

support

then

refer

the

appropriate

Principles

Operation,

Electrical

Description,

Wiring

section

of this

manual.

The

schematic

diagrams

are

provided

assist you in isolating

components

that

are

field

replaceable.

EPSON

PRINTERS

EPSON

PRINTERS

1.1

PRINCIPLES

OPERATION

The

descriptions

the

printer

mechanics is

generic

all models

with

few

exceptions.

PRINTER

MECHANISM

Theprinter

mechanisms

are dot

matrix

mechanisms

withsub-miniature print

heads

developed

for

high

quality, precision

printing.

Because

some

the

units

come

with

tractor

feed

attachments

and

also

are

equipped

with

rubber

plates,they maybe usedwith continuousbusiness

forms

or rolledor cutsheet

paper, as required by

the

user. No special additional equipment need be

purchased

accommodate

the

various

paper

types. Basic

operation

all

the

models

essentially

the

same.

Sensor

Mechanisms

Sensor

mechanisms

all

models

include

the

home

position

(HP),

timing

(PTS),

and

the

paper

end

(PE)

sensors.

Home

Position

(HP)

Sensor

The

sensor

assembly

consists

a HP

sensor

and

sensor

plate,

situated

beneath

the

carriage

assembly.

The

sensor

emits

a HIGH

signal

whenever

the

sensor

plate

intercepts

the

optical

axis

the

photo

sensor.

The

variations

the

signal

alert

the

main

CPU as

when

the

carriage

isin

out

the

home

position (i.e.

the

left

end

the

platen).

This signal servesas a

reference

signal for

the

printing

operation.

Timing

Sensor

(PTS)

The

PTS

sensor

mechanism

consists

the

sensor

and

sensor

disk,

located on

the

shaft

the

carriage motor. The

PTS

signal is

generated

order

coordinate

carriage

speed

with

firing of

the

dot

wires,

allowing

adequate

time for

the

operation

to be performed. A

HIGH

signal

isemitted asthe

slits

inthe

disk

pass

the

optical

axis

of the

photo

sensor.

1-1

PRINCIPLES

OPERATION

Paper

End (PE)

Sensor

The

sensor

consists

reed

switch

mounted

the

sensor

board

and

reed

magnet

mounted

a PE

sensor

lever.

The

assembly is

attached

the

rear

the

printer

mechanism.

When

the

printer

runs

out

of paper,

the

reed

magnet

and

reed switch

meet

causing

the

warning

signal

output.

ASSEMBLY

The print assembly is comprised of the carriage assembly, including the

carriage motor,

timing

belt, and platen; ancf the print head,

which

mounted

the

carriage

assembly.

Carriage

Assembly

The carriage assembly is moved back

and

forth

along

the

carriage shafts

the

timing

belt,

which

driven

the

carriage

motor

via

the

belt

driven pulley. (Figure 1-1)

Carnage

motor

Timing

belt

Fig. 1-1.

Carriage

Mechanism

PRINCIPLES

OPERATION

The

carriage

motor

isa 2-2

phase

stepper

motor.

phase

(ROTORl B

phase

••

—o-

Fig.1-2. Carriage

Motor

Connections.

The

timing

belt

drive

sequence

demonstrated

Table

1-1, As

the

carriage motor rotates,

PTS

pulses

are

generated,

energizing

the

head

driving coils,which inturn fire

the

dot

wires housea in

the

print head.

TABLE

1-1. Carriage

Motor

Step

Sequence

Carriage

Motion

Step

phase

Bphase

phase

OFF OFF

l.«ft

tight

OFF

ON ON

OFF

1ON OFF

OFF

Right left 2

OFF

the

carnage

motof

rotates.

PTS

pulses

are

senerated.

energizing the

head

driving coils, which in lurn

fire

the

dot

wires

housed

the

head.

1-2

EPSON

PRINTERS

Printing

Operation

When

the

head driving coilfor a

dot

wire isenergized,

the

actuating plate

engaaed

one

end

the

dot

wire is

attacheclto

the

iron core, driving

the

dot

wore toward

the

platen. The

dot

wire,thus driven, strikes

the

ribbon, pressing it against

the

paper

the

platen assembly,

and

causing

dot

imprinted.

When the head driving coil is de-energized, the actuating plate spring

recoils,

causing

the actuating plateto

spring

back

to it's

original

position.

Thedot wirealsosprings backunderthe combined forceof

impact

energy

and the recoilof

the

wire resetting spring, and isagain engaged with

the

actuating plate until

the

next print

head

drive signal occurs. Firingof a

dot

wire isdepicted in Figure 1-3.

Wire reset spring

Stopper

Actuator

plate

Ooi

wire

Ribbon

mask

Ribbon

• Iron

core

Paper

'^Actuator

plate

spring

Fig. 1-3.

Mechanism

Platen

EPSON

PRINTERS

PAPER

FEED

MECHANISM

The

Model

3510/3560

mechanisms

are

adaptable

for

use

with

different

paper

types. The Model 3510 has

three

paper

feed options: friction, pin platen, or

sprocket

feed,

and

utilizes

three

paper

types: roll,

cut

sheet,

or continuous

business

form.

The Model 3560

operates

with

both

friction

and

sprocket feed,

and

may be

used

with

continuous

business

forms

cut

sheet

paper.

Friction Feed System (For Rollor Cut

Sheet

paper)

The friction

feed

system permits use of roll (Model 3510 only) or

cut

sheet

paper, which is fed

through

the

platen

assembly

between

the

paper

feeding

and

paper

holding rollers.

Paper

support

roller

Paper

feed

roller

Platen

gear

Platen

Paper

feed

gear

Fig.1-4. Friction Feed Mechanism

Paper

tead

motor

1-3

PRINCIPLES

OPERATION

Pin Platen Feed System (For Continuous Business Forms 9.5

and

10 Inches

in Width/Model 3510 only)

the

platen

feed

system,

paper

held

in place

platen

sprocket

pins

the

platen

shaft.

When

the

paper

feed

pulse

motor

rotates,

the

platen

aear

train

driven,

rotating

the

gears

illustrated

Figure

1-5,

and

pulling

the

paper

along

the

sprocket

pins.

When

the

platen

feed

system is

used,

the

paper

feed

rollers

are

held

apart

the

release lever, since no friction is required

for

movement

tne

paper.

Platen

Sprocket

ptn

Sprocket

wheel

Platen

gear

Paper

feed

motor

Fig. 1-5. Pin Platen Feed Mechanism

PRINCIPLES

OPERATION

Sprocket

Feed

System (For

Continuous

Business Forms)

Similar

the

platen

feed

operation,

the

sprocket

feed

system,

perforations

the

paper

margins

are

fitted

over

the

pins

the

sprocket wheel, the paper islocked in place bya paper holding

cover,

and

drawn

through the

platen

assembly

astne gear

train

activated

the

paper

feed

motor

(Fig. 2-6).

sprocket

Sprocket

wrteel

Sprocket

gear

Sprocket

transmission

gear

Paper feed gear

/ Paperfeed motor

Platen

gear

Fig. 1-6.

Sprocket

Feed

Mechanism

1-4

EPSON

PRINTER

RIBBON

FEED

MECHANISM

The ribbon feed unit of the Printer mechanism consists of a cartridge ribbon

and

ribbon

feeding

mechanism

which

set

belt

tension

plate

assembly.

The

right

left

motion

the

timing

belt

transmitted

the

ribbon drive gear through the gears on the belt tension plate. Due to

conformation of the gear train, the ribbon is

always

fed in a counter

clockwise

direction.

When

the

ribbon

feed

roller is driven by

the

ribbon drive

gear,

the

continuous

loop, inked ribbon is

wound

between

the

ribbon

feed

roller

and

the

ribbon

support

roller.

The

ribbon

brake

spring is

set

the

exit

the

cartridop

case

prevent

slack

the

ribbon

wound

in.

Ribbon

laading

roller

\o,

Ribbon

pressure

roller

Ribbon

mask

Planstdry

pmiori

Planatary

pmion

Ribtwn braking spring

Ribbon

driving

gear

Planetary

pmion

Pldneidty

pinion

Bell

drivan

Iley

Carriage

Fig.1-7. Ribbon Feed Mechanism

EPSON

PRINTERS

ELECTRICAL

CIRCUITRY

Power

Circuit

The AC

input

power

supplied

the

power

transformer

through

the

filter

circuit.

The

outputs

from

the

secondary

side

the

power

transformer

are

input

the

circuit

board

and

converted

into

voltages

via

the

regulator

circuit.

These

voltages

are

supplied

their

respective

corresponding

electronic

circuits.

FX-80+/100+

Filter

Circutt

Power

Trans

former

♦5V

O-

+24V

O-

VX08

(option)

Rogulator

Circuit

F)^^ircuU_Bo^

Fig.1-8. BlockDiagram of

Power

Circuit

FX-8S/185/105

fXEXT

-O

+5V

-O

+24V

(Vp)

-O

+12V

-O

-cBV

-O

VKp

-o

Vkc

AC12V

1-5

Voltago

+24V

(VPI

♦5V

(Vcc)

♦

lav

_AC12V

Vkc

(♦6V)

P|t5V|

PRINCIPLES

OPERATION

TABLE

1-2.

Types

and

Applications of

Power

Application

CorriBO

motor driva

(|)

Paper feed motor driva

(D Print solenoid drive

(i) li>iertaceoption circuit board power

t'T)

FXMB

logiccircuitdrive

(X)

Carnagemotor tiolding

Paper feed motor holding

® Indicator lamp drive

Cjij

Interface option circuit board power

Cf)

FXEXT

logiccircuitdnve

(I; Interface option circuit board

power

(D Interface option circuit board power

Power

reaei

(I) Buzzerpower

(D Print solenoid protection

PRINCIPLES

OPERATION

Filter

Circuit

The

filter circuit is

situated

the

FFIL

circuit

board

together

with

the

printer

power

switch

and

fuse.

The

power

cable

is also,

connected

the

iPilter

board.

The

input

from

the

power

line first flows across

the

power

switch

and

fuse F1. After being filtered

out

by C1, it issupplied

the

primary

side

the

power

transformer

via

the

noise

prevention

circuit.

Power

line

noise

(external

noise)

into

the

printer

and

noise

(internal

noise)

occurring from

the

printer

are

eliminated by this noise prevention

circuit.

Capacitors

and

are

not

used

for

the

120\/

version.

O-

d\j>

SOOajH C2 ^ i.700P

dp O lpF

CN1

4700P

O-

>N>.

-O

Fig. 1-9.

Fuse

and

FilterCircuit

1-6

EPSON

PRINTERS

Power

Transformer

the

Printer,

the

power

transformer

changes

the

input

into

AC 26V

and

12VAC

through

the

filter

circuit

and

supplies

necessary

voltages

the

control

circuit

and

option

interface

circuit.

PRIMARV

PRIMARY

flCitC.

AClZOv

ACK

SECONOARy

orange

SECONDARY

50/60HZ

Pgray"

flfay

wange

orange

AC9.1V

AC27

50/60H2

O-

BROWN

white

iQfay

Ofange

orange

120V

Version

220/240V

Version

Fig. 1-10.

Power

Transformer

Windings

AC9.0V

AC29.8V

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