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CONTC:NTS

GE

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'L DESCRIPTION

General

....·• ·• ..

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.

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•

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Specifications

••••••••

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iii

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1-2

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1-5

1-6

1-7

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2-6

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2-9

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3-18

3-20

3-22

3-24

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4-4

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4-

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4-5

4-7

4

-8

4-9

4.2.S.2

4.2.6

4.2.6.l

4.2.7

4.3

4.•

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4.3.2

4. 4

4.4.l

4.4.2

4.4

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4.4.2.3

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4

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4.

3

4.

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4.4

4.4.5

4 .• ,

4.

·6

CHAPTER

'5

'

5.1

5.2

5.3

'

5.4

5

.•

5

5. ,6

5.• 7

5.8

5.9

5.1

-0

5.11

5

.1

2

5.13

5.14

5

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5

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'

5.l

5.1

·

5.

2

5.

15

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5.

1'5. 4

5.•

15.5

5.• 15 . 6

5.•1

5.7

5 .

l'

S.

8

5.•

16

5.•

17

5.18

5.• 19

APPBIJIDIX A

A:PPEN:0 1X B

Remote

Oat.a

Loopback

Test

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Acoustic

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Analog

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20

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.o

re

Default

Values

•••••••

••••

.

•••

••

•••••••

•••

System

Addr

,

ess

Map

••••••••••••••

••••••••••••••••

Hardware

Interrupt

Vectors

•••••••

,

•••••••••••••••

USART

Baud

Rates

and

Clock

Frequencies••••••••••

vii

4-35

4-36

4-37

4-38

4-40

5-2

5-3

5-4

5-5

5-6

5-7

5-9

5-10

5-11

5-12

5-13

5-14

5-15

5-1

,6

5-17

5-19

5-20

5-21

5-22

5-24

5-26

5-27

5-29

5-30

5-31

5-32

2-3

2-4

2-5

2-7

2-11

2-12

2-20

2-24

2-34

2-35

..3-9

3-10

3-19

3-4

3

-5

,

f-

1

4-2

4- 3

4 - 4

4 - 5

4-6

4-

7

4

-8

4-9

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Int

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Assignments

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•••

viii

3-2

·0

3-38

4-14

·

4-16

4-2

·0

4-21

4-22

4-23

4-25

A-2

B-1

B-'5

INTRODUCTION

This

manual

provides

maintenance

information

for

the

DECwriter

Correspondent.

There

are

four

different

models

of

the

COrrespo

:

ndent.

Thes

,e

models

are

described

in

Paragraph

1.1.

The

manual

has

been

prepared

for

Field

Service

engineers

and

other

technical

personnel

directly

involved

with

maintaining

the

DECwr

i t,

er

Correspondent.

Be

,c.

ause

this

manual

conce

.

ntrates

primarily

on

equipment

maintenanc

,

e,

information

pertaining

to

programming

and

operation

is

summarized.

For

d,

etailed

discussions

of

these

topics,

refer

to

the

correct

docunent

.• .

(Refer

to

the

list

of

available

doc1ne

.

nts

on

the

DECwriter

Corr

,

espondent

i .n

Paragraph

1.3.}

The

manua

l

is

divided

into

the

following

chapters.

Chapter

l

Chapt

.

er

2

Chapter

3

General

Description

--

Provides

an

overview

of

the

terminal,

an

introd

,

uction

to

its

physical

and

functional

characteristics,

a

list

of

avail

able

d,

ocunenta

t

io

·n

for

the

DECwr i

ter

Correspondent

series

,

and

specifications.

Controls

and

Indicators

Provid

,

es

a

summary

of

all

the

operator

controls

and

indicators

on

the

ter

:

minal.

Also

included

is

a

summary

of

the

SET-UP

parameters.

Theory

of

Operation

--

Provides

information

on

the

terminal•

s

internal

operating

principles.

The

chapter

is

divided

int

•o

sec

;

tlons

on

the

primary

functional

areas

,

of

the

termi:nal,

such

as

.

microprocesb:>r/control

system,

I/0

communi:cations

.

system,

keyboard,

printing

process,

paper

advance

process,

power

supply,

nonvol.atil.e

RAM,

and

integral

direct

connect

modem.

ix

,

Chapt

er

4

Tr

,ou

bl

e

shooting

--

Describes

t he

term

i·

na

l

se

l f -

tests,

provi

de

s t

ro

ub l

es

h

oot

i ng

tab

l

es,

and

covers

other

hmct

i

onal

t

es

t s

:use

·d

to

i

so

l

ate

fau

l 1

ts.

Cbapt

,

er

5

tsech

,

ani

c .a l

.S

e 'r

vi

c

in

,g

- -

Pro

v

ides

the

rem

,

oval

and

r e

p1

a

cem

en

t

proced

ur

es

for

al

1

field

repl

ac

,

eable

unit

s (

FRU

s}

..

A:p

;

pendi,

: A Esca'

pe

Se

,

quence

Su

mm

ar

y

--

'Pro

v

id,es

a

summary

of

the

·

progr

a :m

mi,

ng e s

ca

:

pe

seq

mm

c e s

that

the

D1

ECwr

i

te

·r

Co·:t:

responde

:nt

,

us

,

es

,.

-ppendix

B

ln

't e r :fa

ce

--

Pro

vid

,

es

a

summar

y ,

of

'

the

1

El ,A i ,

nterface

,

as

s

ig

nm,e

nt

s ,.

1.1

GENERAL

CHAPTER

1

GENERAL

DESCRIPTION

This

chapter

describes

the

DECwr

iter

Correspondent,

.

the

four

models

available,

and

spe~ifications.

The

DECwr

iter

Correspondent

is

a

microprocessor-control

led¥

desktop

portable

dot

matrix

terminal

designed

for

use

as

an

input/output

hardcopy

machine

in

computer

systems.

The

Correspondent

hcmdi.es

1200

baud

normal

text

without

fill

characters.

The

maximum

print

rate

is

150

characters

per

second.

There

are

four

Correspondent

models.

Model

A

Model

B

Model

C

Model

D

Keyboard

send

rec

,

eive

(KSR}

termin.itl

with

a

300/1200

baud

integral

direct

connect

modem,

a

300

baud

integral

acoustic

coupler,

and

a

50

to

9680

baud

EIA

port

KSR

terminal

with

a

300/1200

baud

integral

direct

connect

modem

and

a

50

to

9600

baud

EIA

port

KSR

terminal

with

a

300

baud

acoustic

coupler

and

a

50

to

9600

baud

EIA

port

KSR

terminal

with

a

50

to

9600

baud

EIA

port

1-1

'

Al

1

models

have

the

same

microcode,

operator

and

host

computer

features.

available

with

the

Correspondent.

so

they

support

the

same

The

following

options

are

Option

LAX12-AL

LAX12-HL

LAX12-JL

LAX12-SP

LAX12-RL

Description

Trac

,

tor

assembly

20

mA

current

loop

interface

APL

keycap

set

International

keycap

set

External

numeric

keypad

Fan

fold

paper

catcher

Large

roll

paper

holder

1.2

SIMPLIFIED

DESCRIPTION

Figure

1-1

shows

the

relationship

of

the

Correspondent

to

the

host

computer

.

The

terminal

operates

as

both

an

input

and

outp

.

ut

device

for

the

computer.

When

the

terminal

operates

as

an

input

device,

an

ASCII

character

is

sent

to

the

computer

each

time

you

press

a

key

on

the

terminal

keyboard.

If

the

terminal

is

set

up

for

local

echo

printing,

the

character

corresponding

to

the

key

is

printed

at

·

the

same

time.

As

an

output

device,

the

termina!

receives

printing

information

from

the

computer,

interprets

the

information,

and

then

prints

it.

Figure

1-2

shows

a

simpl

ifi~d

bl

,

ock

diagram

of

the

correspondent

in

local

mode.

When

you

press

a

key

in

local

mode,

the

keyboard

gene

.

ra

·

tes

.a

code

that

is

sent

to

the

logic

board.

If

the

character

is

a

control

character,

it

is

sent

to

special

processing

logic.

If

the

character

is

a

motion

characte

,r

(such

as

tab,

form

feed,

backspace,

line

feed,

or

carriage

return)

or

a

printable

character,

it

is

sent

to

the

printer

mechanics

via

the

microprocessor

control

bus

on

the

logic

board.

The

terminal

then

prints

the

character

if

it

i ,s a

printable

character,

or

performs

the

specified

motion

such

as

a

carriage

return

or

form

feed.

Figure

1-3

shows

a

simplified

block

diagram

of

the

Correspondent

in

on-line

mode.

Characters

received

from

the

computer

are

sent

to

the

logic

board

via

the

communication

logic.

If

the

character

is

a

con

·

trol

character,

it

is

sent

to

special

processing

logic.

If

it

is

a

printable

or

mo·

tion

character,

it

is

sent

to

the

pr

inter

mechanics

via

the

internal

microprocessor

control

bus.

The

terminal

then

prints

the

character

if

it

is

a

printable

character,

or

performs

the

motion

if

it

is

a

motion

character.

If

·

the

Correspondent

is

set

·

up

for

local

echo,

the

terminal

prints

keybo

,

ard

characters

and

sends

them

to

the

computer.

If

the

computer

has

host

local

echo,

it

returns

these

keyb

,

oard

characters

-to

the

Correspondent.

1-2

llOST

CO~PUTER

HOST

COMPUTER

Figure

1-1

•

·,.#:

SERIAL

DATA

OUTPUT

TO

HOST

SERIAl

OATA

ECHO

ED

FROM HOST Uf

SYSTEM

HAS

tiQST

ffATURE

INC:LUOEOI

.

...,.

•...

..

. " .

1•1

W11EN

USED ASAN

INPUT

DEVICE

acn

A NULL

MODEM

CABlE

SERIAL

DATA

SENT

FROM

HOST

lb)

WHEN

USED ASANOUTPUT DEVICE

....

oeo,.,

Computer

--

Correspondent

Interface

~~~~----------------,

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/110

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1-2

r'OR

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PLEASE SEE FOLLOWING

Local

Mode

y .

....

!

..

,

1-3

•

HOSTCOMPUTER

Figure

1-1

(al

SERIAL

DATA

OUTPUT

TO

HOS;

·

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NULL

MOD.EM CABLE

SERIAL

DATA

ECHOED

FROM HOST

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HOST FEATURE fNCLUOEOI

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BC22

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(bl

WHEN USED

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Computer

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Interface

1-3

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K:

EYBOARO

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PROCESSING

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Figure

1-2

Local

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1-3

PRINTER

MECHANICS

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Character

Printing

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The

Correspondent

prints

characters

by

moving

a 9

-wire,

soleno

i

d-operated

prin

•

thead

horizontally

along

the

pr

int

line

and

then

firing

,

gr

,

oups

.

of

discrete

wires

at

each

pr

lnting

posit

ion

to

form

9

by

·9

dot

matrix

characters

.

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graphics

printing,

the

ter

,mi

nal

c t

eates

a

single

vertical

column

of

dots

for

each

character

receiv

,

ed.

1

..

2.

2

Char

act

,

er

Sets

The

standa

,

rd

character

set

for

the

Correspondent

is

the

USASCI

I

character

s,

et,

whi

ch

includes

95

upper-

and

lowercase

chatacters

a·

nd

a

Delete

character.

'

The

Correspondent

can

also

print

the

fo

l

low

i

ng

character

sets

.

USASCII

United

Ki

ngdom

Frenc

h

Canada

Germany

Sweden

France

Finland

Norway

/

Denmark

Spa

i n

Italy

APL

Line

:Drawi

ng

.(

VTl0

,

0)

1.2.3

Ribbon

Cartridge

A

disposable

ribbon

caLttidge

mounts

on

the

carriage

assembly

and

surtounds

the

printhead.

An

inking

whee

l

on

the

cattridge

significantly

extends

the

life

(up

to

10

mi]

H

on

characters)

of

the

ribbon,

which

passes

around

the

ink

it

HJ

ill<

·e

el

during

carriage

motion.

1.2.4

Physical

Description

of

Components

Figure

1-4

shows

the

components

of

the

Correspondent.

The

Correspondent

has

the

following

communication

methods

.

•

Integral

acoustic

coupler

(models

A

and

C)

Integral

direct

connect

modem

(300/1200

baud)

(models

A

and

B)

EIA

port

{all

models)

20

mA

interface

(optiona

l )

(models

B

and

D

only)

The

integral

direct

connect

modem

provides

a

connection

from

the

telephone

1

ine

to

the

logic

board.

Another

cable

connects

the

modem

to

the

telephone.

fE

00~

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ASSEMBLY

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l N LOCAL ECHO.

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ERMINAL

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ER

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ARE SET TO LOCAL :ECHO. CHARACTER

WILL

B'E,P,RINTEO TWICE. .

.,

0,-,IHI

J

Figure

1-3

Li

ne

Mode

1

-4

rexTE

,

RNAL

,.

ICONNECTOR

I

ASSEMBLY

I

ii

FH0MPHONE

OUTLET

,EIA

.J

ACOUSTIC

------

COUPLER "20rnA

fOPTIONALJ

LOGIC

aOARO

INTEGRAL

MODEM

80ARD

KEYBOARD

POWER

SUPPLY

·

PR

INT-HEAD

LINEFHDM0TOR

ENCODER ASSEMBLY

Figur

,e

l-4

DECwr

i

tee

Correspond

.

ent

D

iagra

m

1-5

115,220V

INPUT

POWER

SERVOMOTOR

M•'\

Oh: 1.ffl

I •

The

keyboard

is

a

conv

,

entional

typewr

i

ter-styte

input

device.

In

addition

to

the

common

alphanumeric

keys1

it

has

special

purpose

S.E

'

'I'-LlP

d•

nd

c,ornmand

keys

and

r.ED

indicators

that

show

internal

states

of

the

ternd.naL

The

keyboard

is

basically

a

switch

matrix

that

is

i'nterrogated

b~.,

the

logic

board

for

any,

switch

closur

.

es.

·The

pri'nthead

is

mounted

on

the

carriage

assembly,

which

!s

driven

by

a

servo

motor.

The

servo

motor

also

drives

the

ribbon

cartridge.

The

ribbon

only

advanc:es

when

the

carriage

is

moving.

An

,

enc

,

oder

assembly

is

connected

to

the

servo

motor

and

produces

fee

·

dback

p,

ulses

to

the

logic

board

to

track

printhead

position

and

carriage

v,elocity

.. A 1

:ine

f,!ed

motor

i$

attached

to

the

platen

as

.

se

.

mbly

to

produce

line

feeds

as

required.

A

paper

feed

meehan:ism

adva

il

ces

the

paper

sheet,

or

r,

ol

l,

up

or

down

,.

~

de

stepper

motor

drives

the

paper

feed

mechanism

directly.

Wjth

the

tractor

fe,ed

,

option

installed,

the

paper

can

be

fed

in

f,

or

,ward

or

r ,

ev,erse

di

r,ect

ion;

however

,,

only

forward

direct

ion

is

re~ommended.

The

power

supply

converts.

the

ac

po

•we·r 1

ine

into

six

de

voltages

used

by

··

t'be

Correspondent.

It

has

;i

switching

regulator

for

high

efficiency

and

cool

ope

rat

ion.

1.3

'!'he

fol

lowing

docum

,

entation

is

availa~le

to

suppo

.

rt

t-he

DECwr i

ter

Cor

r,espo

;

nden·t

•

DECwr.iter

Corres

,

pond,ent

User

Docum,

entation

Packa

,

ge

'

Installat

i:

on

Guide

Operator

and

Pr

•

ogramm~r

Ref

.

erence

Cards

,

Opez::ator

Guide

,

Programmer

Refer

,

ence

Manual

DECwriter

Correspon.d,ent

Iristal

la

tion

Guide

:DEC""°r

i1

ter

Corr

,

es

:

ponden

·t

Operator

and

P.

rogr

ammer Re:

fe

:

rence

Cards

D£Cwri

'.

ter

Correspondent

Pr

,

o,Jrammer

Refer

.

ence

Han

·

ual

,

DECw

:

riter

Corr

,

espond

e

nt

Pocket

Servic

,e

Guid

e

LAl:2

Field

Ma

i

ntenance

f'r

i

nt

Set

Documen

·t

Number

EK-CPL12-UG

EK-CPL12-!N

E:

K-CPLl

2-RC

EK-CPLl

2-0P

'

EK-CPL

12-RM

EK·•

CP:Ll2-PS

MP

-013

57

-0

:0

1.4

SP~CIFICATIONS

This

a

ragraph

lists

the

specifications

for

all

four

DECwriter

Correspondent

models.

The

same

specifications

apply

to

all

models

unless

otherwise

stated.

·

Operating

Characteristics

Printing

technique

P~int

matrix

Maximum

print

speed

Max imu:n

throug

.

hput

Horizontal

slew

rate

Single

l

ioe

f,eed

time

Vertical

slew

rate

Paper

feed

Vertical

pitch

(user

selected}

Horizontal

pitch

(user

selected}

Maximum

line

length

(Varies

with

horizontal

pitch.!

Margins

{user

selected}

Tabs

(user

selected)

Character

set

Other

printer

features

Impact

dot

matrix

9

dots

wide

by

9

dots

high

150

characters

per

second

120

characters

per

second

45

inches

per

second

38

ms

Apprvxirnately

5

inches

per

second

Sprocke

'

1:-feed,

tractor

drive

Coptional),

friction-feed/platen

drive

2,

3,

4,

6,

8,

or

12

lines

per

inch

10,

12,

13.21

or

16.5

characters

per

inch

{single

width)

5,

6,

6.6,

or

8.25

characters

per

inch

{double

width)

10

characters/inch

""

ae

colmms

12

characters/inch=

96

columns

1

3.

2

characters/

inch

=

HIS

col

urnns

1,

6.

5

characters/inch

=

132

columns

teft,

right,

top,

bottom

132

horizontal

(maximum)

168

vertical

(maximum)

Refer

to

Paragraph

1.

2.

2

Cover

open

interlock,

self-test,

status

message,

terminal

reset,

mariual

last

character

visibility,

autn

lc1ist

chara.cter

visibility

1-7

:ateybo,ar,d S;

peci

rications

Keyboard

Embedded

numeric

keypad

Other

:

keyboard

features

t

Physlcal

Characteristics

Dimensions

(

Includes

two

inch

roll

,

of

paper

..

)

Length

'

Width

Height

Weight

T,

erm

inal

po

,

wer

Voltage

Watts

,

opPrating

ltonope

,

ra

,

ti

ng

Relative

humidity

Op,er,

ating

Typewriter

style

with

roultikey

rollover

(Refer

to

Para

g

ra

ph

3.3

..

6.)

13

keys

including

3

function

keys

Local

line

feed,

auto

repe.at

on

all

alphanumeric

keys,

local

form

feed,

k,

eypad

select,

line/local

modes

46.5

cm

{l

:

8.31

in)

39.3

cm

{15.S

in)

14.5

cm

(5.7

in)

9.5

'

kg

(21

lbs)

heaviest

models

,;

includ

,

es

carry

case,

paper

roll

and

power

cord.

90

vac

to

128

vac

or

180

Vac

to

256

Vac,

switch

selectable

47

Hz

to

63

Hz

Printing:

45

watts

Nonpr

inting:

25

wa

'

tts

10°

to

40°C

(50°

to

l04°FJ~

noncondensing

-4:0°

to

,66°c

(-4

,

0°

t ,o

151

°F)

,

noncondensing

10

to

90

pe

.

rcent

·

with

maxi~um

we,t 0

bulb

temperatur

,e

of

28

c

'(82 ,

g,

and

,0a

minimum

dew

point

of

2 C

(36

F),

noncondensi

,

ng

5

to

95

percent,

noncondensing

PAPER

SPECIFICATIONS

Roll

feed/single

sheet

Width

Weight

Sing

le-part

Optional

Roll

diameter

(standard}

Roll

diameter

{large)

Core

diameter

(standard

roll

paper}

Core

diameter

(

large

roll

paper}

r'an

fold

feed

Wi

.

dth

Weight

sing

le-

part

Multipart

21.5

cm

t:o

21.66

cm

(8.47

in

to

8.53

in)

4.5

kg

to

9.0

kg

(10

lbs

to

20

lbs)

5.08

cm

{2

in)

10.43

cm

(4.5

in}

maximum

(optional)

2.03

cm

(13/16

in)

2.

54

cm

{l

in)

24.1

cm

to

24.2

cm

(9.47

in

to

9.53

in)

Sprocket

holes

c.

enter

.

ed

on

22.86

cm

{9.0

in}

with

a

diameter

of

0.396

cm

(.0

.156

in)

•

6.

8 kg

(15

lb)

paper

(minimum}

•

0.25

mm

(0.01

·0

in}

thick

card

stock

{maximum)

2

parts

(l

original

plus

l

copy)

0 "

50

mm

(0

.•

0.

20

in)

thick

{maximum)

NOTE

Fi

rst-sur

fa

.

ce

i111pact

paper

is

not

reco-ended.

Dot

or

line

glue

margins

are

accoptable

(if

line

i ,s ,

on

one

■

argin

only).

Split

forms

(forms

witb

each

side

co.ntain!ng

a ,

different

nuabe

.r .

of

sheets}

are

not

recommended.

Stapled

fo,

:ms a·

re

not

reco-ended

..

l-9

tte,yboard

Character

Sets

Comaunications

Features

Interface

Baud

r at

es

Split

b

aud

rat

e s

Chara

c

ter

fo

rroa t

Pari

t y

Jnp

ut

bu

f f er

(

user

se

le

c t~ )

USASCI

I

United

Kin

gdom

French

canada

Germany

Sweden

Prance

Finland

Norway/Denmark

Spain

Italy

APL

Line

Drawing

(VT100)

EIA

standard

(all

models>

20

mA

optional

(models

Band

D

only)

Acc,ust

ic

coupler

(models

A

and

C)

Di

rec

·t

connect

modem

(models

A

and

Bt

50,

75,

110,

!1.34.5,

150,

200,

300,

600,

1200

,

1a00,

2400,

4800,

12e~,

and

9600

baud

75

baud

send/600

baud

re~eive

75

baud

send/1200

baud

receive

150

baud

send/60

·0

baud

receive

150

baud

send/1200

baud

receive

300

ba

ud

~end/2400

baud

:r ,

eceive

300

baud

send/4800

baud

recei

·

,e

600

baud

send/2400

baud

r .

cce

iv

e

600

baud

send/4800

baud

receive

7-

or

8-bit

ASCII,

serial~

asynchronous

Even,

odd,

or

none

(e

i g

hth

bit

set

to

mark

or

spa

c

e)

1024

chara

c

ters

o r

290

c

ha

r

ac

ters

Ful

1-

d

uplex,

h

..il

f-duplex,,

a nd d

.t

t

.1

l ,

ea

d s o

nly

l-

10

Ribbon

Specifications

Cartridge

Di

mensions

Length

Width

Height

Ribbon

fabric

~aterial

Thickness

Width

Ribbon

life

Miscellaneous

Featurec

Answer

back

Positioning

commands

SET-UP

feature

storage

10.64

cm

(4.188

in}

14.15

cm

(5.570

in}

1.42

cm+

0.051

cm

(0.560

in

+

0.02

in}

Nylon,

nontextur

,

ed

0.086

mm

to

0.1076

mm

(0.0034

in

to

0.0042

in)

1.27

cm+

0.0381

cm

(0.5

in

:.

0.1s

in>

10

million

text

characters

up

to

30

characters

long

Horizontal

and

verticalr

absolute

and

relative

True

nonvolatile

meaory

(no

batteries}

1

-l

l

2.1

GENERAL

CHAPTER

2

OPERATOR

INFORMATION

This

chapter

provides

a summary

of

the

following

items.

Terminal

controls

Visual

indicators

Audible

indicators

Keyboard

keys

SET-UP

Terminal

self-tests

The

desclt'iption

of

SET-UP

includes

the

st;\tUs

message

printout

and

the

following

features

which

can

be

configured

for

a

specific

system

application.

Communications

features

Keyboard

features

Pr

inter

features

2.2

TERMINAL

CONTROLS

Figure

2-1

shows

the

terminal

controls

and

Table

2-1

describes

the

controls.

2.3

VISUAL INDICATORS

Figure

2-2

shows

the

visual

indicators

and

Table

2-2

describes

the

indicators

.

2-1

lll880N

AOJUST

KNOB

Figure

2-1

Term~nal

Controls

2-2

PRINTHEAO

ADJUSTMENT

LEV[

ll

~~-Al

PLEASE S

EE

FO

LLOWING

FRAME (

S)

•

Table

2-1

Terainal

Controls

Control

voltage

selector

switch

Power

on/off

switch

(

1/0)

Paper

release

lever

Bail

bar

lever

Printhead

adjustment

lever

Ribbon

adjust

knob

COI-U'-IN lNOIC-'ITOR

De

.

script

ion

Changes

terminal

to

match

ac

input

voltage.

The

position

labeled

1

turns

power

on.

The

position

labeled

0

turns

power

off.

Reposition

or

remove

friction

fe

.

ed

paper

:from

terminal.

Holds

paper

against

the

platen

during

pr

in

ting.

Controls

space

between

printhead

and

platen

to

adjust

printhead

for

clear

printing.

Tightens

ribbon

when

installing

a new

ribbon

cartridge.

1 O I , 1 I , , , , I , I I I I I I I t I I

5

10

15

20

12 : , : : I , I I : 1 I I I I I I I I I I I l i ' I I ,

5

10

15

20

25

OSR

CTS

RISO

0 0 0

Tabt.

-

--

-

---

!).•

t (_...,.,,r 10 , u

Figure

2-2

Visual

and

Column

Indicators

2-3

RIBBON

ADJUST

KNOB

F

igu

r e

2-1

Termi

nal

Contro

ls

2-2

PRINTHE

.

AO

ADJUSTMENT

LEVER

/=~~------·

1151

220V

VOLTAGE

SELECTOR

POWER ON/OFF SWITCH (

ll

Ol

MA

Of.l,

l

'.J

8 3

Digital Equipment DECwriter Correspondent User manual

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