Intertec Data Systems SuperTerm User manual

0~1-

C\i(\.

--

Super-Term

Maintenance

Manual

#11100500-00

Coytdght

1f78

. .

tatei:wc Cata

9rst~.s

CorporatiOn

All

rlgj\hJtaserved.

TABLf!OF

CONTENTS

SECTION

1:

General Description

ancUJpeclflc:atlOlls

...•..••

r

•••••

,

••••

Page1

1.1

lntrodUctlon

1.2 Generat:Specifications

1.3 Technical Specifications

SECTION

2:

lnslaltatlon and Operation

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

Page3

2~

1 lnstallatlon/Cable Connection

2.1.1 A.C. Line Cord

Conn~lon

2.1.2

Input/Output

(110

Cable Connection)

2.2 Operation .

2.11

Gemnt

Procedures

:tu

Ribbon Installation

2.2:3 Paper Loading·

SECTION

3:

ln1erla~ng

..............••........••..•.........•.......

Pau•

5

:u·

~rat

Information · ·

3.2 Interface-Specification$

3.2.1 RS-232C/Sell 202C Interface.::·

3.2.3 Parallel

tnferfm::e

SECTION

4~

Internal

Opetatfott<

...........•...•...••......•.•..

;

....

Page5

4.1

General

~w

4.2 Power Supply

4.2.1 RecUfief/FiHer Section

4.2.2

Regulator

section

4.2.2.t

PCB

~bly

#11310004l't

4.2.2.2

PCB

Assembly

#1131-~1-Rev.01

4.:J

AnalogPower

BOliin:I

t113()0Qi()..Q2

4.3.1

Ova'Yiew

4.3.2

Par,ler~

Drive

4.3.3

Card$t

Servo

Drive

4.3.4

Print-Wire

Solenoid

C>riVe

4.3.5

Volt•

MOl1ft'dt

4.3.6

RibtfCSft

Ori'/$,

4.3.7

pea

A$sftnbly

~ISion

History

4.3.7.1

PCB

Asserffl:)Jy #

11~

4.4 Digital

Card

PCB

A$aembly

#1132001..00

4.4.t

Overview

4.4.2 Power C>lstribution and Filtering

•">•a•_•

.-,.

·.,.

•

·•·

• •

'•-.

'"•

l'i•'

0<1

4.4.3

Mlcroprocessor'/Sy~Slii:'Sus

and Control

tbg'icf

'..

,.

4.4.4

Memory/1/0

Gatlng:60gic:·

-'"

i

~·

·'

;.

r,,

I

,.

;.c<1;4,.,4.~;~

~Y~~.@lj9..

RAM•.1'

)''

·~

..

,.,

•

,,'·

:,

...

'.

,r

..

1:'.·:

: •

~;4:6

'

system

ROM

...

' .

.·

. .

,

\ii.t4.l4•T'•

OJ)tion'DeebdiAg

L.~lc!

: •;j

.;,

·'.~'.

I

vi'

"J·

.'~,:'

4.4.8 System

1/0

4.4.9 Servo/Head Control

Logic

4.4.10 System Timers and Interrupt Control

4.4.11 Serial Interface Logjc..i

t"'

·.

:.

"

-·"

.:1.

·

·'';.

4.4.12 Current Loop Interface and Control ...

._

4.4.13 Parallel Interface

Logic

. · ·

4.4.14 PCB Assembl'y'."Revisiam.History :

:.

-

.~.4.14;1

PCB Asseroply,#1132000-01 .

'

..

,,

-:u:14.2'

'Pcs

ASsembly #1132000-02 "

4.4.14.3 PCB Assenst>ryl#1132000-02.;Rev.

01

4.4.14.4 PCB Assembly

#113209.Q-02·~~v.

02

4.'5

EPROM CARD PCB

Assemblyilf'l'1~

foplion)

4.5.1 Standard

Fi"'!IY!~~

9@~.figuration

·,

.'.·

..

· ·

4.5.2

Custom

ECO COnf,tpurations .. .

4.6 Converter

Card'·

._,1:~'.

·•

·

'..1'.'

•'

;•!·

..

-:

·

:.

4.6.1

Function

4.6.2 PCB Assembly Revision.Histor.y

..

4.6.2.1 PCB Assembly #1134000

~:;,,

.t·

·•·

:

::·:_·

..

·~4-..6;2;-2-..PCB::AssemblY·:#.H~1····

·:

::-·

·:

·

4.7 Keyboard PCB Assembly #1140000-00

· • 4.7·:1··-aeneral·Oiscussion

..

4.7.2 PCB Assembly Revision

History

4.7.2.1 PCB Asserhbly.11140000-00

4.7.2.c?

PCB Assembl.y·'#t140000-01

4.8 Printer Assembly · · ·

4.8.1 Printer Frame Assembly

#111ooep.-O()

..

4.8.2 Carriage Sub-Assembly #111100d-00

4.8:3 Print-:Heail-S\Jl>.Assemt>ly #111200o-0D

4J~:;_4..

·Printer

Cowr

Assemblyj#1-160000-00 •

4.9 Internal Cabling ·

.....

.

...

,

·.

.

...

·

..

4.9.1 Analog-to-Digital Card (long).#1150101-00

4.9.2 Analog-tcr.DJgltal Card (short)

#n50100-00

4.9.3 Converter4o-Analog · •·

4

•.

914;/.KeyJx>ard,Pable.#1150200-0Q·•

::S:~.

~~~ri~~e;,~~rd.>

#1_150300-00

5:9':7

RS-232C

1ntert.iee:

eabie

#1.150500-00.

4.9,&~

Cu.1$ent

·.L'QoP-.

lntertace'.Cable ·

4.9,.9

.ear:aHet

Interface.Cable . .

4.9.10 Power

supply

·1:i81'fless

4.9.11 D.C. Power-Distribution Harness

SECTION 5: . . . , ,

..

::

..

.

Maintenance ,

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

Pl,l98

22

5.1

Gefteral Maintenance Techniques . ·

5.1.1 G,eneral Maintenaooe fi!equirements • ·

5.1.2,General Ma.inten•nce Instructions.

5.1.3.General Maintenance Precautions''· ..· . .

5.2 Maintenance Levels, NeceS'sary Equipment, Spare Parts

5.2.1 Maintenance Levels

5.2.1.1 Level

1':;

5.2.1.2 Level 2

5.2.1.3

L.evel

3 '

,•

.

5.2.2, Required Tools, Equipment, and Parts

)·~a.2.~

..

~-1.

•.

'·''"

,~~.

5.2.2.2 Level 2

5.2.2.3 Level 3

5.3 Preventive-Maintenance (Level -

.1)

. . $.3.1

PIM.Philosophy

....

5.3.2

P/M

Procedures

5.3.3 Cleaning and

ln!pectlon

' . ·

(.~.::

.·

"·~

· 5.3.3.1 Printer Cover

...

~

.

..

.

5.3.3.2 Printer Assembly, .

5.3.3.3

KeyboStd'

.

~:-'""'·

•

•·

5.3.4

Lubrication

..

.

....

..

: ·

:;

C

·~·

5.3.5;1 Carriage Rails. . . ·

.··

•

5.3A:2

~rr!a~e

1

Assembly 88arinQ°s:·.....

:

..

5;3.4:3'Ccin:lagelSelt•TensiorfAssembly

..

·.

• 5.4 Corrective Maintenance

(Lev~I

-·2). j .. ,.,., ·;.

5.4.1

C/M

Philosophy · . ,.

..

5.4.2

C/M

Level - 2 Test atid Adjcistment Procedures

.!i4;a•1.

Car.rlaoe~Drjvei-Belt

.fnspection.

_5.4.?.2

P~.

l".F~

l;lri~

JnspfJCl_l.9"

..

5.4;2:3 RlbbOtl

'Drtve-

lnspeCtion··~:

..

·

..

:

5.4.2.4 Keyboard Inspection

"•

' .

'.'

f . .

5.4.2.5 Print

Quality

Inspection

···5;4:2.6·

Print

Quallty·Ad;ustment ·

5.4.2.6.1 through 5.4.2.6.9 Detailed adjustment

procedure.

~:

.

~~

-

~

~~.\;. ~~-

5.4.3 Level - 2 Module R &

~-

Proci!rcfures

5.4.3.1 Removing SuperTerm

from

Cover

•

\·;t."•;~.4.3.2

Prlnt-Hsal~•·;•

.".\'-.;:J:'.'~3

...

':

..

:i:'h·F~'i

5.4.3.3 Analog Power

Board

5.4.3.4 Digital Card

5.4.3.5 Converter Card '

~.::L;:;.c·

"'.'

··

";I

~

.

·~

..; . 5.4.3.6

PQwer

Supply

R90-.;_latOfio~

.

,:

.

~~J~

~~

'

~·:

.•

1 5.4.3.7 Keyboard

•..

•

•.

.

i;

,..,

1

· ·

,,, 5.'4.3.8 EPROM Card (Opt,IO}l) . .

'"

•

..

__

'{

\;.

5.5

Correctlv~.

Maintenance (Levei.:at

'.

· ·'.,'

5.5.1

C/M

Level - 3 Objective

·'

1<J

1'-

·

..

"

5.5.2 M$chanlcal Assembl)i:R·

&-~R

Procedl.1te ,

->··

•

·'

5;5;2.1 Carria,?e

Sel!C)·~Qtqr-AsserQblyl.

_:~

.•

.q:-

..

_.

5.5.2.2 Papef-Feed

S.t~P,per

Mqtor

.. . ,

11

.

-i

.

fll't1

~

5.5.2.3 Ribbon-Drive

Mbtor

0 • · • ' •

~

..

5.5.2.4 Paper-Feed Tractors

5.5.2.5 Carriage Drive

Belt

5.5.2.6 Paper-Feed Drive Belt

5.5.2.7 Print-Head Spring-Cable Assembly

5.5.3 Electronic Troubleshooting Procedures ·

!!'.

SECTION 6: - ·

-.

. J

'£

,.

Accessories

and

Options

...••••..•••.....•••

;

.••

,.;,:

::

•••

-Page

28

~·

·.

6.1

General Information ;

..

~.

t.

.

6.2 The Basic SuperTerm Data

Communications

Terminal

6.3 Accessories ·

6.3.1 Ribbor:i.Cartridge (6-pack) #11901()(),!lff · . .

6.3.2 Stand

(accom~tes

bottom

feed)..#11qoo,.pD

·'

6.3.3

·Operator-~

ManllaH#1100100-00 . .

··~

· ·

'.

6.3.4 Malnfenilnce.Manual #11bosoo-oo, -

'\':';\\

\

..

6.4

Options

•

,,.-

·-·

~

,,.,,.

·

6.4.1 Option Package A

6.4.2

Option.fackage

B

6.4.3 Option Package C

6.4.4 Option Package D

6.4.5

APL/

ASCII

6.4.6 1200Baud

6.4.7 1800 Baud

6.4.8 Current

loop

Interface

6.4.9 Parallel Interface

6.4.10 Data Concentration

6.4.l0.1

DTR Technique ·

,.-

,.

6.4.'10.2.CNTL

s,a

Techniqtle- ·

6.4.11 IBM 2740/41 Emulation ·: '

6.4.12 Bell System 202C Interface ·

6.4.13

Sel~ive

Add~sing

6.4.14

Non-S~~ndard

Character Set

.,.

6.4.15 Automatic· Reverse

Printing

(ARP)

6.4.16 Re-programmed Keypad

~·I

6.4.17 Re-programmed Escape Character

(Po~n)

.

6.4.18

Auto

Echo , . "

6.4.19

Here-is~SeQ.1,1ence

.·.

· ., ;

6.4.20 32 User:t=c>nt-Programmable

C_h&r,aeters

~.

-..

. .

,,.

-

SECTION 7: ·

,_._,

.';,;( ·

~·i;,

. .

(lllJ>..

Circuit Diagramsand LogicConventions . : .::':

••••••

-

.•

..

:

..

~-

.

7.1

General Information ·

·r·

! «

7.2 Signal Nomenclature .

:-

.){,

. e

\;.,

.,

7

.,3

Integrated

Circuit

,Device

Listing

Dlll.$1rams

. . .•

1.4

SuperTerm Schematic Diagrams ·

·~.

· ·

.,

) ··

7.4.1 Module Interconnection .

7.4.2 Power

SupP.IY

Rectifier/Filter

Sectien :

,,::

,

7.4.2.1

·st~~

Configuration ·· ,

7.4.2.2

Optlorial

Configurations

7.4.3 Regulator

e&id'.

. .

'.f'

·

._

· 7.4.3.1 PCB .Aasembly #1131000-01 . , .; .

..

· ., 7.4.3.2 PCB

A•l'!lt>IY

#1131000-01-REV.Q'I

'Fi

::

7.4.4 Analog Power

Board

7.4.5 Digital Card

..

.. ..

·-

,,

.

··-

- -

7.4.6 Converter Card

..

'

7.4.6.1 PCB Assembly #1134000-00'

7.4.6.2 PCB Assembly #1134000-01

··

SECTl0Nr8: · ·

)f

·"·

Appendices

•••.••........••••••.....••••.•••...•

;"';

..

;;:

J•a0~4s

-·-:

;.:-··

8.1

Appendix A: SuperTerm Parts Lil!lt : .

.:;

7

8.2 Appendix B: USASCll Code Chart .

8.3 Appendix C: IBM Correspondence/EBOD Code

Chartrfnt

· !""I

8.4

Append.i)!:«D:

Typewriter/BIT fl•rkilg Code

..

Charts

..

iiCJ.

...

1 ·

8.5 Append!x

E:_

Control/Function

1$,Y_

lnde~

..

.

...

. .

,,

..

~·..

:

8.6 Appendix F: ECO's ·

·'

· - ·

i.

.->

..

~

..

i

..

8.7 Appendix G: Addendums To Manual

8.8 lntertec Warranty Information

S_ection 1:.

.

....

.

•

~

....

:..:"'-

• •

~

t. • •

~~··~

: ' •

,,.,

' \

GENERAL DESCRIPTION AN

.,

- ·PECIFICATIONS

1.$.

· . .

•.

-

·"..'

.

·

-,

1.1

Introduction

.......

..

. .

..

t'.he

lntertec

SuperTerm D

ta

CommtJ .·cation Terminal

is a

highly

flexible,

fu11¥

.

pro

.grammable, .

data

te

minal

I

line

printer

for

use in

computer

applica

.

itons

requiring

hard-copy,

impact

printed

~~

output.

lts

"'

wid

,

~

.range

of

features were designed

to

:

ml'ake

SuperTerm easy

to

use

and

compatible

·With

.

virtual

_

l,X

"

~~Y

computer

·

system

or

ata

communications

·

netwQ

·

~

,

.

. . ., I

:~_,_~~~::::

1

.!;i;~.,

..

.

· ~·

:·.

·~

1..:-··-,.;:::~

·

...

..

·

..

FIG.

1.1

TheSuperTerm Data Comrriun.

ications

Terminal

TheSuperTerm

employ~

state-of-the

art

rni~roprocesor

technology

which

is

tiig-

hly

reliable and.:..easy

to

service

and

maintain.

Moving

parts

are few· and necessary

cleaning and

lubrication

.

may

oftef'1

.:·

be.carried

out

by

he

user

thereby

minimizing

expensive. field service

calls.

The

electronic

modules

in

_·;

.S

.

up

.erTerm were

designed -for a

long

service Iife allowi'ng the user

to

operate

the

terminal

for

extended

·

~

.:

Be

.

riods

of

time

without

any

da

.

rn~ge

or

overheafi

.

~

;

_,~·

Should

any

module

fail,

minimum

downtime

is

required

to

effect

a

repair

since

all

modules

were designed

for

easy access

d.n

_

Q&Jick

replacement.

,;·~

~

1.2 General

Specifications

't

f ..

,:

...

·-

,.

The lntertec SuperTefm may be ct.istom

configured

fer

differing

applications.

Special

options

are available

that

allow

each

terminal

to

be tailorecfJto meet

specific

· ser requirements. These

optio11.¢

~

:

.

~re

discussed

in

detail in Section

6.

The basi.c

S~p

.

erTerm

has many

standard features found

only

as.-,

.expensive

options

on

other

machines. These

featureS

·

ar:e

~

·

listed

in Table 1-1.

.......

TABLE

1-1

STANDARD

FEATURES

1:

•..

~

·

Microprocessor

Control

.

'•

• 60, 30, 15 and 10 Characters Per Second Pri.

J:it

Rate

• 128 Cl1aracter

ASCl{Set

• 7 x 7 Dot

Matrix

Impact f>ri'nting •. .

•

Cartri~ge

:

Ri

_

QPQA

. .

.';._

..

-~::

..

•

Adjustable

--

Head·

for

.P;rinting Up

to

8 Copies

• Upper and

Lower

Case ASCII Charaeters

;-

ll,

•

~

:.

·~

~

.

·'

..

.

~

,,..

.

...

. :··

'·'

·

.....

·,

. I

Page 1

•

Adjustable

Forms

Tractor:

1"

to

16"

Wi

de

•

10

C~~r~~ters/

_

i_

nch:

H?~~OFJ~~l.

~:>:

~

<.t:>"·

..<

,..,

·,_~

r:.~.

~

..

• 6

Characters/inch

: Vertical-.

.-

.

-r

~

·

.:

..:

...

:;

:

~_.

\

...

i

~

·

.::

-. '

-·

. ':\ '

• Selectric Configured Keyboard

\l'

t

.

~

N

_

~

~Y

.

Rollqver

.

,1·

,,_

•.

- ,

...

..

J".

{

'll.1•

·

v'

• 22-Key

Numeric

Pad

With

:.

Ge.ar

~

hifted

~:

PuAotion

Keys ·

··

· ·

··

·. · ·

--~

··"

·

~

-

;·

,

• Repeat Key .

_,

,

-~

:~.

:

~~.

~

,

~:-

~,'

-

~

-

<~

_

..

·>

_·-.-~<>

·

;-

~'.

.-·:·

~;.

~

• Last Character Vfs'it:)ility

°K

·

e

y

. ~_

·

;

: :.

·:

:

·-

...

·

-

-~

~:

:·

.·:··.

,.

. . .

"

~

-

~...

. ' ; . '

_.,,,

:

~

..

~

".:

'

~

...

'

~

'

!,.

• Paper Advance Key

··

.j

· :: ·

:-~

...

~

~-

~·:

~

·- .·,

;,.

:

~

.

--~

-

~

·

~

• "

I•

•L.

~

'

l'•

.

't..J.

~

.J

'

· '

• Parity Selection (odd, even·:

,:

ri

one

)

..

~:

..

. ·

...

:--

• Mode

Selectiotr

:(half

,

dupt~x

-

~

;

Ju11

·

7

d

.

~pte4C,

~

tocal)

• 1,000 Chara

ctef'Print

Buf

f

er

·:

,.

./',

/

~: :':

··

· ·

:~--<

• RS-232C I

n-terf~ce

~

'

~

:'

:·

.''.

~

.-·

·:

...

,:-·

:..

.:

.

+.

•

Text-Optimized

PrintiA§

,.

·~ ~

,.

_·

.j

..

!

..

~

...

··.

'.

·: . ;

.,

:.

·1

,:

.~

--

.

:..:

.:

·

l .

•

Auto

Line

Feed On

-

~

-

~

ri

<

a9,e

R

'

EEt~rh

::_

.

-:~·:>>~

,?

~

• PortabiUty: Self-contained, besRtop · .

-~:

·

·,

.

.-.·~.>.

..

•

Bottom

Feed

:·

~}

1:)

_--

..

·

r.~-

•

Quietizing

Packag~

-

~

t

·

~

{

:

~

..

~-

..

_

-

·

--

~

~-

-:~·~-

·,·

~ ~

.-,

:

~

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~

1:

-

~

t'

'

~

·

.•

-.,

: ; .

,..

TA~LE

t

~

2

>

.,.

..

·

USER

-

OPTION

PACKAGES

';

. . ' _ _, .

.'.':

...

.

...

~

·.

~--

P PTION ._PACKAG_E A:

l~~-"

.

'-

'

.'

' · ' • ' ,. c

~

-

~

..

•

..

Forward an

<t.;.

;

Re~erse

~

Ho

r:

izQntal; "Tabs,

··

Vertical

Tabs~

-

~

..

Keyboard

..

~

Lock

•

out

v

<

Fixed

Horizontal

10

Tabs, Top

of

form

..

~

'

(:·

·:---..

:

~--

·. ·

.

-..

:-

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JNS!AL~TION

ANQ'OPERATION

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:·?.·:·1

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,·~

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2.1

-'lf\

~alladbn/Cable

con_rieetion

lnst

~Jf

~

J

io~~f

the

SuperT~r

"·

is

quite

simple

_arid. may

be.P~

~

r~~

.by

a~y

~~er

.

...

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(.)ne

only

needs

to

. find a

su1~t:t1Jle

..

l

.

o~t1on,

(1.e.

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-

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.-

art

atmosphere free

of

high

conc;e

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t~tion~

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of

dµ·

st

and that has an

~

$cceptable

~mbi~t1~

·

fe,m

..

p·erature·

.

rang

·

~,)

connect the power

··

and

1nterf$p~

cables and

t.h~

·-

installation

is

complete. No

furthe

-~

~

~jus~f!!ent

or

..

con!1ection is necessary. Once

t~e

Sup~

r

re

.

~m

\~:

s

setuJ?,

_"

'l~

;

1s

capable

of

running

indefi-

nitely

witl'l~

fi

lY

·the peribdic preventive maintenance

discussed in Section

5.s.-

· . .

2.1.1 A.C. Line Cord

Connection

"

•.

...

•"

,.

• • J • " "

••

'°

~

~ ~

•-

~

•

~

I

4"

" '

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••

• •

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•

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• .

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The SuperTerm

is

supplied

with

a durable

3-conductor

A.C.

line

cord 9feet

(2.

74m)

in length.

All

machines are

shipped terminated

with

~

a-

:

U

~

S

{

$t~nEtpJd

·

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1115

'.

VAC.

at

15A

p~

.

y.g,

Thos~

.

mach~

.

n~s

.r.

~~~u

,

i(~.(lg~O

_.

~VAC.

must

have tti1s plug

cut

off

and·a proper

b~e

-.

~ostalled

to

meet local requirements. ··

.,

1 .

..

The

power

requirements

for

the partfc..utar>SlfperTerm

being installed

mu.st.

:

be

_

p~~FD;

l

~~~

.

~r.1d

.

the;A.C.

Une

cord properly terminated.

After

1nsunng the [POWER]

switch

is in the

"OFF"

positien,

:

Jhe

machine:

r:nay

be

plugged

into

a~

.

putlet

RrovidfQ'g

,

J

l;le

;

prgp~(.~oltage

as

specified in Sett.ion·

t

.:

3

:

~

:

,

,k

..

_-:

· . _.,

:t

. . •

".

..:

.c ·

' f

~

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\,

,.

;

,

~

;

-;

I;, - .

:;

I :

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' • ••

-

~

>;

2.1.2

Input/Output

(-110)

.

ca

le

.,

CoflnectionL.

The SuperTerm

i-ncorporates~h~

51A

.StaA ard RS-232C

interface as a standard feature. However, the cable

must

either

be purchased as

an

acc~sscii'};

.:·

·(Order

#1150500-00),

or

supplied by

the

,

user

...

··

The Intertec S1JperTerm i$

a1s

·o·

a"a1Jabl&:.

1

with

optional

Current Loop

·

(btde

r

·

#

~

11720004l0)

'

antl

il?arallel (order

# 1173000-00) interfaces.

If

the

appropriate cable is

specified at

time

of

order,

the

machine.

will

be.shfpped

with

the

cable installeq.·

~

·

If

the cable is pur-chasedrse·parately

or

i$•

tJSer

supplied;

it

must

be

connSF.t~

to

the~u(ler.Ter~

-

by

removing

the

printer

from

its

..

cover in

orc;Jer

to

plug,

rn.

,

the

interface

cable. The

proper

-:

r~mov~1

·Pf9cedure

is

=

~iscussed

in

Section 5.4.3.1. A

description

.

of

..

tJie

·i11tefface cables

and

their

connection

to

SuperTerm ·can

be

found

in

Section 4.9.6, Section 4.9.7 and

Sec~ie.n

~-~

.,

a

~

..

Assuming

that

the

i:nterface cable .,

is

inte

r

nally

con-

nected

to

the SuperTerm,

~

tbe

free ·

end.

:-·

must

be

con~

·

nected

to

a modem,

the

I/

0

f'ott

of

a

h

1

0~t

CO!Tlputer,

or

other

data

communications

line. "

the

,·-

user

mus

't

"

'"'

·

,;

..

""'t.

-(

("'fl"

.

ascertain

the

compatib

li.ty

of

the· interface he has

chosen and

the

device

to

which

it

is

to

be connected.

Specific

information

on the interfaces can·be found ih

Section 3.

The factory standard length

for

atl interfacecables

is

1O

feet (3.05m).

For

cables

of

longer lerigth, eleqtrical

noise and losses in the cable

must

be considered.

For

informatio

n feg·

arcHng

special interface cabfes, consult

your

local·

lntenec

Repres~nt~tiv

e

. .:.:-

:.~

__

,:

2.2 Operation

....

fi

"

:-;

\

i

....

'

2.2.1 General Procedures

~'

I

.1&

•

l)~._.

:\•~:

::

..

In

this

section,

no

attempt

is

made

to

g.ive an

exhau~t-

'

ive

discussion

on

the

use and\

..

.

i

of)~ration

r

..

1.?J

.the

SuperTerm

D~~

·

~

-

;

CO~f!1unicatjon

_

~>

Terr:n~q~t.

Outffried

bet

ow

are the

m9~~

bas1q

,procedures

need$'.J

to

·operate

any

SuperTerhi

~

,,

..:

For

l •.

·

campl~te

·~

9

.

E?

l

t9H~,

.

consult

a

SuperTerm

~~.r~~·,-m~o

'

i

·

~ati9

·

ns

~

r~rin'r

.

nal

Qperator's

Manual#

1106100~

~

:_,.

:-'

, ·\.

.!

.•

\

-·'·

.

..1Uh<':.

:

··

.

?t/

1C.J

;

~

·

~

· · · J:

:1

J~

_,

A.

Powering.:·On! :

"·

..

~

.-

:·~~(-

..

:.··:?

~;.

·

·"'

1.

Flip

thef

POWE

;

R]

·

~witch

-

~

.~

,q~~f~d

:

j~st

under the

right

hand side

of

the keyboard,:

to

the

"ON"

position.*

(See

FK3

[

~

~.

~

..)·. ·.

·./

('

·

:.:~

.·

N

~

6r~

j

Tb

-

~J

R

'

~~o~

.

J:

~~

q

ei!

~~~~

~Hi

illumi~ate

mom

e

ntan~y

·

cfn

tf

th

'

e

tarnag~

·

Jlf

:restore

itself

by

slewirig

slowly

to

the

true

1e f

1

~

ma

r

gin.

2.

The terminal

is

absolutely

quiet

when

not

printing.

tj"'"Ji~.li°'·,<·"·

~;!,

.

'.~~·-'td.~~:~

~:.~·

.;"'

3.

Note that all terminal conditions

are

reset

to

their

default value5.

ff

tabs'-0r margins·

have

been

set

pd~

to

th~

t~rrnJnat~ing

powered. pff, these

rT'!l;JStJ;)e,.i;~s~~·

"·l

,,.,

'J:l

. .«

..•

Ji')'..

...··.,

....

~·,·

,·

:.:;.

·7•

· ··:1°

1·.

/"

:'

r•'

,";•-.

.r,'"'

· ;

_~f

•.

*

11·

ttie' carriage

slams

i_nt_o

.the end-stop during

power-on, Tum the-maChine OFF 1MMEDIATELY and

call your service representative. .

:1

B. Powering-Off:..

,.,

.

..

. .

-.I

..

' ·. "

1

~

i:ne,termip~I

f:nay

b~.'power~

off

at any time with-

•

QµtJ~I"

~ff~,c~;'.,ttc?w~yer.~

.ttJ.~re

is

np

han:n

done by

1¥~\'?Q.

!1.Powered

o~,,f~[~X~~nded

periods.

2.

wtle'n

'1ett

power9d-ori,

...

the

terminal will retain any

p~grammed

settin~s

indefinitely.

3.

To power off, merely flip the [POWER] switch

to

the "OFF'' position. (See FIG. 2.1.).

C.

ON·LINE OPERATION:

In

order

to

allowthe terminal

to

communicate with a local storage unit

or

the

central computer

syst_em,

theterminal must

be

in the

"ON-LINE" mode.

.,

'·

·~

To go "ON-LINE":

,

~

. Insure

m.at

_the

[LOCAL] switch, (FIG.

2.1

.) is not

·

.·

·depressed· ("OFF").1

1f

the switch is depressed,

·

:.·.,Qe_p.~~

t~e

swi~C?h

aga!rf

an~;tit

;will return

to

the

..

·uP..

C'OFF?)

pos1t1on

and thereby place the

;' ''lermil'lal

11

0N-LINE'\ ..

'~2;~AnY·f~ndibh

or

control keys may now

be

depressed fo specifically configure the terminal

to

be

compatible with the host

syst.ern.

NOTE:

Speed

·-selection'must

be

made In local mode.

3.

When the terminal senses the carrier signal from

the host-system, the[READY] -indicator will illum-

inate, signaling the operator that the terminal is

ready

to

communicate.

D

•.

LOCAL·OPERATION:.This feature is used when

it

is

necessary

to

set up functions, program operations,

.

feed

paper,.

ortype material not

to

be

transmitted

to

the

hos~

system.

To

go "LOCAL":

1. Depress the [LOCAL] switCh, FIG. 2.1) until

it

stays in the detent position ("ON"). The [

READY]

indicator should illuminate.

2.

The

Terminal may now .operate in LOCAL.

. i . . , ·

...

,

::

...

-~,·

.

~-t

'

2..2.2

..

:

R•b~fl

lr.astalla~iQn

.

..

. . . .

..

, ,

..

The·

Sqp~rT~rm·

printer

_µ~es

~-lnterteq•s'"own'.

snap-in

ril:>~.n"

cartr~dge,

(Seec

FIG

...

~;2).,

.,w.hict,I.·

.provides

approxim~t~~y

..

three.qu~ers

ota

miUion tiigh quality

characters~

per cartridge. It may be quickly and easily

changed and the user's hand

need

never touch tbe rib-

bon. Outlineq below is the simple procedure followed

rhe,~

.insta11~~9-~or,;t~1.af

!~R:a

-~~~~on

~.~r1a~e.

-

...

·•.

"'.

.

~

..

,.

.

·.

. .

(.':;

•.

.

...

.

·.

'

~

...

":"

..

•

.·

..

·.

' .. . .,

::

1:

Remove

the

tertni11at·~~ace~s

co~~r_

wt)i.ct)

·protects

the carriage

area.

·· · · ·

~

· ·

··

·

:.:,_

\t

. ,

..

··:.

2.

Insure that the

expo&.eQ

rib6on~in

the

new

cartridge

is taut by winding the small post on the upper right

side

of

the

cartritlge~

Ulu$trated in FIG. 2.2. (If

ribbo~

clip has

been

sprung outward, pinch

cartridg~

clips inward.) · .

:,f!J'\ii'

'

~-Thread

the ribbon around the print-head and.place

the ribbon cartridge in the

..

cartridge:Jlolder, gently

pressing downward until It snap& into plactt,•A brass

post on either side of the forward.

edgE:t

:

of

the

carriage will insert into holes in

thE;t.

bottol"Q

of

the

ribbon cartridge holding

it

rigidly in

p,lace.

A

ribbo~

·

is shown being installed in FIG. 2.3:

·,

RIBBON REMOVAL

·-

\.

1.

Remove

the terminal's access cqver which protects

-the cartridge

area.

''.

·.,

..

'"'>~

"

~

-

2.

Gently press downward on the two tabs located on

eitherside of the ribbon cartridge (FIG. 2.3) allowing

the cartridge

to

pop up slightly. '

3.

Grasp the cartridge, removing

it

from the two brass

posts,

and

lift

it

away

from the carriage. A new rib-

bon

may

now

be

installed

and

the access

~ertA.

replaced. .

~.::

,

~;

·

2.2.3.Paper Loading

The

SuperTerm printer is capable

of

feedi~g

paper in

two modes: top feed and bottom feed. ·

When

top-feeding, the paper is

brougnfin

'from the

rear

of the machine

and

inserted behind the platen,.,

much like

an

ordinary typewriter. When ¢ontinuing to

·push

the paperthrough,

it

will thread·its way under the

platen and exit in front of the platen.

\The

paper is then

pulled forward and up around the platen and then

placed in the forms tractors maintaining alignment

between the paperholesand the tractor sprockets.

The~

tractors

are

then closed and adjusted

to

keep

the paper

taut and against the platen. There is a clutch lever on

the outer side

of

each

tractor which allows the tractors

to

be

positioned

as

needed

and then locked into place.

When

this lever is in the "UP" position, the tractors

are

locked: When in the "DOWN" position, the tractors

are

free

to

move horizontally. Figure 2.4 shows a

top-feet-~

machine.

~

When

bottom feeding,

it

is necessary that the

SuperTerm

be

in~talled

on a special-table-or stand with

clearaccess to thebottom feed slot in the printer cover

(lntertec's optional roll-a-round stand #

119030o-Oo

is

an

excellent choice).

ta-

When

using bottom-feed, the paper is fed through both

aslot in the cover and aslot in the bottom

c.>f

the printer

chassis. The paper isthen pulled up and

fed

behind the

small guide rod just under the platen, ·up.,past the

platen, and is then placed in the forms tractors and

adjusted as noted above. Figure 2.5 shows a machine

being bottom-fed. . - _

···

,

~

IMPORTANT

NOTE:

All paper loading should bedone with the

carriage at the true left margin. ..

,.,_

.

~\'.('"i'

. ·:"J

.:

·

.•.

Bottom feeding will yield best results when:opei'ating

with high volume throughpur·using fanfold-paper.

.

·-::.

~

-~

Page4

·•

'·

i .

Section

3

I,

.,

"

::;,

r

:·•INTERFACING

·~

'!'"'':;

..

~.

t

~;··

..

·::-:

3.1 General

lnfonnation

The three intef.'faces available

for

SuperTerm enable

if

to

becompat1ble

with

virtually any data processing

or

data

cornmunicatioos system. All interfaces are

compatitih!~witli'currerit

industry

standardsignal levels.

. This sectibh. :details all ' interface specifications. A

~echnical

discussion

on,.

the

interface

circuitry

is con-

tained

in

Section 4.4. ·

•wow

..

•-·•••

•

3.2

lnterfa~

S~ifications

3.2.1 RS-232C Interface/Bell 202C Interface: The

..

Electronic fndustries"Association (EIA) has released an·

·"""RS-232C Sl?ecification which details the requirements

for

a standard.interface between data communications

equipment and data processing equipment. RS-232C

specifies

the

type and the number

of

conductors

to

be

used as well as

the

voltage levels

to

be used. lntertec's

SuperTerm employs

this

specification

for

its

standard

interface... ,

~!.

--r~

Bell

S~tem

202C interface· is an

option

(#1176655-00) on

the

SuperTerm.

It

is

covered· here

because

it

uses the same line receivers/drivers

but

with

a different

timing

setup

for

communications.

Machineswhich have

this

option

installed may operate

using

only

the,RS-232C interface

if

the

202C feature is

f!lll\deselected. The interface cables are identical.

Table

3-1

outlines

the

signal names and pin connect-

ions

for

the.RS-232C/Bell 202C interface.

.

~

. Table3-1

RS-232C/BELL 202C INTERFACING

0

.,

·\

e"'~

G>

r-..

i!

....

c:

E

....

.,, 0

.,,

·-

(/)

ci

.

i~,.

QI()(.)

z

~~-'

c._

l(l

!:!:!.:Z"

~~~

iii.

I

O::z•

·J~8!l'

•<;f .

C:'

a:iw_

c:s~~-

""'.E'w

Cl

owa.: ·w-$.o·

(.)

.....

(.)

:.:::

0

Ill

c;;

-"

2 BA

..

103 4 Transmitted Data /&3

3 BB 104 1 Received Data

'"~

4·

CA

105

5 Request

to

Send

/IP~

5

CB

106 3 Clear

to

Send /tJ{>

7

'.

AB 102 7 Slgnal Ground /()

z_

8 CF

109

2 Rec'd Line Signal Detector

It'!

11

·scA/SA

120

8 :Secondary Request to Send

12

..

~SCF/SB.

122 6 Secondary Rec'd Line Signal

.,,

....

' ·eetector

3L""

·CD

108.2 9 Data Terminal Ready '0

8/A.

•There

is

a discrepancy between

RS-232C

and

Standard assignments on a Bell System

202

modem; I.e.,

202-name

202Pln#

RS232name RS232Pln#

SA

11

'

SCA

19

SB

12

SCF

12

We

have

chosen

to

use

RS232

signal names and a

plnlmlii~ment

for·scA/SA

In

accordance with

Bell:~~-

~odems~

" "

•·

.

.•••

,

....

,.\

"f"

. t

....

:.;:..

t,.~

.....

....

••

,r-,..1 ;

1/

i r .

3.2.2 Current Loop Interface

···:··t·

•.:~~

~

r.

·

~

.

;~

;"'

i .

;·

·:

1 .::

~·

...

~··:.~

~-,i~

:~~,1

'···

· NOT

Y.:e'r

A'VAil.ABLE, ,

..

,~,_)

Thismaterial

will

be

diS$emin~tea

in

the

f6¥tir<

of

a technical bulletin.

For

your

denveritens~f'

·

enter

the

bullet

in numberbelow

for

future reference.

,,

TECHNICAL;BJLGET1N#::.

;:~

.\·

..

:.·;::;

:.·~

-

..

;···

.:

.').

.:

•···

!:

·•1.;~

• ,

....

,,\r

- - I

•·

~1·

3.2.3 Parallel Interface

..

· · ' · "

~

··

NOTYETAVAILABLE

.

.'C···;::-

..

"

\"

:-.

·;

' .

~

1 .

.•

...

' •

~

••.

' , •

..

......

••

This material

will

b~

dJsserni/l~ted;

ir('.th~

·~oi-t;r(df

,a

technical

bulletin:

Fo~.y0i,ir:

cojiy~nf~ce,

~n..t~r':

the

bulletin

numberbelow

for

future

·referenc~.

TECHNICAL BULLETIN#: :

.'

. '

..

-

..

·;

'.(

. . '

.\

....

-~.

.·

....

i r

Section

4

·:~.-

.

.,

.

~-

-

.•

...

•f

,_,

INTERNAL

OPERATION

"'j

4.1

General Overview

"'

lntertec's SuperTerm Data Communications

Te.r.minal

is a state-of-the-art

d~~ign

utilizing·· !he. hi,ghly

acclaimed and field proven 8080 ·mlcrocomputer

system. This 8080system

isthehearfoftheSupe(rerm,

controlling

all

functions

and data manjpulation. Figure

4-1

shows a basic

block

diagram

of

_th~

51.lPf?rt'~rpt~'

{'

MECHANICAi.

SYSTEM

(Printe1

Assembly)

'

~

..

'-!t

!.:·

....

r--"'-'---"'"--t'

".

·•

POWER

DIGITAL

CARD

(8080

System)

.

ANALOG

i.-.--~

:;>

1

~fR

BQtRQ,

,·

S,U!'l'\-Y

·

...__

__

__.

1,

-

..

'·

l

··~-..··'

;;

·.

K~SOARO:

,.;."

:-f

;:1

,

1

.·

~

'.

:~

·;>.,"

•

,..

.

1.'f'

I

FIG.

4-1

SuperTerm

Block

Diagram

Each

of

the

blocks.

in

the above

diag~am

w'J.tfbe~t1roken

down and

·disct.iss~d

·in

ctEitail

~rf:th•s

sedtioh-. ·While

some

particular

(fircutts may

b~fsHowri.

fi:ft

iltustratioi'f,

complete sct\Elniatics·

are

a:vaU~olEf'lli

··sedtlon 7.

··~

·~

··

·

'1

..

' • :

:'

:·r-

•.;~"

·~

,1

"r!

:o:~

·...,

''.'~(

•

,•7

~·,~

q',·,·

...

, ' .

·~

~~.

"~

...

•

4.2 Power Sll'pplY ·

·i

~-

.,

'4·

••

:"··

•..

:::

-'

..

•·

..

·•

The

Sup~rTerm.

po~~~

1

suppJy

f99.!J!at~s

a1T.~~h~ges

~a·nd

is

of

conventional linear design empfoying solid-state

voltage regulators-. ·

...

- -

~·

·-

-- ·- ... · -

..

·

..

·

..

For:

...

p_µrp.o.ses

...

oC~btr&rui

3

~ide.6tthealiQn_

-~od.

err9r

red!)ction.,, a

.s!arJd.~r.d

colqt

cop~

.i.~.-1;1.~~

.W

Sup~,rT,erm.

Thfs1 color·cotle

ts

·1tsted·1h'iabfe

~1.

1

···

.,

~

· · •

'·

·

•

·:;

:~~;·-'

'9~>~

'•,

~I

~'·•

~

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

·

~-

-

.

····

..

:·_·

-·

....

S:tl

perTerm

.....

-_

.....

-·.

·

:=-

·

,..--,,

,.,

..

.

~

-

~~-

POWER

bi'S

.TR

f'

BUTION

COLOR CODE

''

,

..

_r

;

__

.,., •

~

•

:::.:

~~

•·

' .

~;

" r

.,..

'"·

•-•

-.;

'',

; -

\1-"

~'f'

""'·

..-t

~

.....

.

__

+.

-s

·.

voc

\:

___

..

,:.~~

:~

.

·-

· ·

·".'.~

..

~

Logic Ground

·:

+ ·

12VDC

\:

±12.

v.

R.etu

tti

.

~.:~

-

..

1

-12

.\

lDC

.

+

~

48

:-

VOC

.

+i

48

V.

Rett.

i

rll'

...

..

+,

24VOe

. ·

;·

+

..

24

V..

__

Return "

"».

""

..

i..

..

.

..

...

~

24

V.DC

.--

..

_.,..

...

P-

.•

•

Orange

Black

Purple

Gray

Blue

Red

White

Green

Brown

Yellow

..

· - ·

";

.

--

·

..

-·

.

--

~

Table

4-1

.

. ) . . \

,.

.·

The power supply is divided

into

two

sections:

the

rectifier/filter

section and the regulator section.

"

4.2.1 Rec

·"

fie·

r/Filter

Section

·.

\,

..

~,

-

The_

rectifier/

f

ilter

section of the power

supply

steps

q!?wn

th

e

A.e.

line voltage

to

levels required

for

the

S-

~

1perTerm.

The A.C. line fuse is located in

the

"hot"

sj

de

of

th

.e

po

_

1ertransformer"primary

circuit.

The three

(3) s99ondaries

of

the powe.r transformerare connected

to

three (3) encapsulated bridge type rectifiers

mounted

to

the

.chassis as shown

in

figure 4-2.

_

flG.

4-2 _SuperTerm

~owerSupply

The

output

s

of

the bridge rectifiers go

to

a bank

of

filter

cap~c

i

t~rs

~ou~ted

~n

the

ce~ter

~

(t

he

power supply

section

of

the·chassis. These·

filte

r capacitors remove

any ·

.A.C

. component

fr<?m

the rectified voltages and

provide.·

a nea

r.

pure D.C.

input

to

·thevo-ltageregu:ators.

A

com

'plete schematic of

.t

hi

s.-section .of:the power

supply

.

is

available in Section

7

~

6.2.

1•

;.

: \ •

...

4.2.•2 Regulator Section . : · .

4.2.2.1 Regul

ator

PCB

..

,Assembly

#11'31000-01

Th

is.

~egul

~

tor

:

~

card

was used

-·

in

··

~he

,

~rly

SuperTerm

terminals. ·It

..

,s

n~

.longer ..beihg produced but is

included

to

aid··in

troub

lesho

oti

ng

early rriachin.es.

T~~

regul.

ator

~rd

c~

n

tai~~

:·

t

~

he

.

~

.i

r

9

ui

t

ry

~9r

a + s

voe

.

regulato~

~nd

.

a

·_

± _1·

~

YDC

regu_l.

C:l

to

r.

·These are·the

~nly

regula ed

··

voltages· 1h the

Su

p

erT~

r

m.

+"

24

VDC and

tt:~

.

~c

p~s~

}~r

Oug

tj

~

t

he

r

eg

~~ator

~rd

but

Only

tor

•

s;·

...t•

,. ,, .

~

..

•,

...

. •

..

.(

. 1

':!

~

·.}

l3

l 2

,

-~

:

"

r---G

1_0

__..

1 G

....

o

_..-..........ai:..i-.:o.-.....;,T;...

3

.....,.

,..

..

t;.:.;;,;

Hi

'

;..._:.

T2~

,

iii..

'

....:,T

~

t

.

.....,:T~

5

·

~

:;....

·

_.,.

..

\

"'

\

0

FIGURE 4-3 -

Figure 4-3 shows the layout

of

the card and the com-

ponent locations. This view is taken from the

component side

of

the card.

The + 5

voe

regulator

circuit

receives +13 VDe,

unregulated, and using a series pass transistor (01)

and a + 5 V. regulator (Z1),

outputs

+

5.

yoe

(+

250

mv.) at T4. 01

is

used

to

carry the

outpu

.:

l,qad

.:

cu

"lt

white

Z1

monitors

the

output

voltage at terminal T4.

L1

controls the base bias current on 01 · d he.reby

regulates the

output

voltage. 01,

02

and

03

pr

ovide

transient protection

for

01 and

Z1

. . _.

C1

and

C2

provide bypassing and

R1,

R2

and

R3

set up

the base bias on 01 . The

output

of the + 5

VOC

regula-

tor

circuit

is taken across terminals

T4

and

TS.

CAUTION

T5

is logicground and should NEVER be connected

to

earth ground (Chassis)! Erratic operation

of

the

terminal may result due

to

hig·h

levels o.f electrical

noise on Earth ground.

The +

12

VDC regulator

circuit

uses a tracking design

such

that+

12

Vis

always

within

a few

mil!ivolts

of

the

-12 V line. The

circuit

is configured such that the -12 V

regulator receives -24 VDC, unregulated, from the

rectifier

/filter

section and using a - 12 V reg,ulator (Z3),

outputs -

12

voe(+ 600 mvG) at T1. . - .

.'

. .

...

The + 12

voe

regulator receives +

24

V

OC

,

,.

unrc

::J

...1-

lated, from the

rectifier/filter

section and using

a+

5V.

regulator (Z2),

with

its

ground reference input floating

above ground due

to

02

,

outputs

+ 12V. (+ 600

mv.)

at

T3.

RS

and

R6

form a precision voltage

divider

~

and

develop a tracking-error voltage on the base

of

03.

03

is a

simple

error ampI

ifier

used

to

control 02.

Transistor

02

is used

to

control the floating.reference

input on

Z2

. If the 12V. output starts

to

drop,

03

conducts more heavily pulling

02

toward

cu~-off.

Z2's

reference is forced

to

a higher potential ,causing the

regulator

output

to

rise back toward 12V. If the +12V.

output starts

to

rise, exactly the opposite

r~C?tion

occurs. If the absolute·value

of

the + 12 and

_·

...

12v.

outputs

are equal, t

he

voltage on the base

of

03

.-

is

equal

to

zero (OV.).

04,

05,

06

and

07

provide transient protection

to

Z1

and

Z2G

e3,

C4, C6 and

e1

proyide bypassing while·

CS

is used

to

prevent oscillation in the tracking ciroui

t-

.:

R4

is.

simply

for

biasing.

"

'(Yr

·~·.,:

. :

Outputs

for

the +

12

voe

and -12

VDC

regula

·cpr

crrs

uit

are

take

n

~

from T3 and

T1

respectively

with

referen

c-e

to

T2 .

~)

_

• • ' I-:.'

,,

,.

..

·

Page

·6·

~

·

-·

-'-

+

24,VDC

comes onto.the.card from the rectifier'/fllter.

~tion,

is fused by

F2

and is output at

TS.

-24

VOC..comes:

onto~tf:le

..

card from the rectifier/filter

. section, is

fosec:r

by

F3'-·ahd

is output at

T1

o.

;

·~utputsJor

·+

24

vec

-anu-24

voe

are

taken from

TS

:

and

TtO.

:respectively,

_with

reference to

T9.

+48

voe

comes

o"nto

the card from the rectifier/filter

sectionds

fused by:F4, and is output at

T6.

Output for +

48"VDC

is taken from

T6

with reference to

T7.

..

-~

NOTE:

None of the outputs from the regulator

card

have

common references except for

±

24

v:

return

an.d

±12

v.

return.

""4.2.2.2 Regulator PCB

Assembly

#1131000-01-Rev.

01

This board differs from the previous board in that

it

does not contain a tracking regulator circuit

for

+12

voe.

·

Instead ofthe t.racking circuit, this board uses

an

inde-

pendent+

12V. regulator for Z2.

02

and

03

have

been

-cl~

as'"have

R4,

R5,

R6

and

C5.

·

"·

...

:

:~.~:

r·.,..~

·.~

A jumper

':has

been

added from the collector to the

emitter pads

of

the former

02

location.

The revised board is shown from thecomponent side in

Figure 4-4. ·

flllll

4.3

Analog

Power Board #1130000-02 ·

4.3.1 Overview

The Analog Power Board receives commands from the

Digital card; provides the necessary digital-to-analog

(D/

A)

conversion, and drivesall moving components of

/ilil!,the

printer assembly. It mounts on the bottom of the

printer

chas~is

as

shown in Figure 4-5.

Figure4-6 shows a block diagram of the Analog Power

Board with interface lines to the Digital

Card

and the

Printer Assembly. Complete schematics of the Analog

Power Board

are

available in Section 7.6.4.

t911n

the remainder of Section 4.3, each of the five

(5)

·

ci~its

shown on the block diagram will

be

broken

dc~

...

-1

and.Gf'Scussed

in detail.

:

.:-ni,·

·· :

4.3.2

Papar

Feed

Drive

The··

Paper

Feed

Drive··

circuitry receives two

(2)-::

...,incoming signals from the Digital card

and

provides

precise paper movements and positioning accuracy to

within 1/48" (0.529 mm).

The

Paper

Feed

Drive circuitry consists of two (2)

identical constant-current, bipolar amplifiers with

negativ_!!

feedb~ck

closed-loop cor:itrol.

The

Paper

Feed

..-motor

ts

a

2!

stepper motor with each phase being

driver( by one of the two constant current amplifiers.

· Figure

4:.7

shows a simplified schematic of one phase.

With no incoming command from the Digital Card, the

Paper

Feed

(P.F.) Drive continuously sources current

through the

P.

F. stepper motor. (The

P.

F. stepper

~motor.ds.-located

on

the right end-plate of the Printer

Assembly

as

shown in Figure 4-8). This steady-state

CUf'l'.'~'b

~.fQl!gt:l-

the motor is termed its "holding

curr~n~!\-:'typical

P.F.

hoJc:$lng

current in the

Sup~rTerm

is 200

ma.

0

Suoerterm

d.c.

OOWtf'

FIGURE

4-4

....

"

T5

Regulator

PCB

Assembly

#1131000-01-REV.

01

' )

......

~

.:.,.:

...

FIGURE4-5

>I

~

..

·

.~-.~·~··

';~

~;

.-·- ·

1

~r

~;

/'·

..

'.k~

..........

-.

A stepper motor with a steady

DC

currentdloWfh..{;f in

each

ofits

phases will not turn

and

is said to

be

in

"detent". Forastepper motorto turn, one of

its

phases

must ·transition, changing the magnetic field. The

steppermotorwill then rotate until the magnetic fields

are

agai.n

aligned. This constitutes one "step" and, in

SuperTerm, results in the advancement

of

the forms

tractors by 1/48" (0.529 mm). The transition pulse

amplitude is

termed·

the "operating current" and is

typically 2 amps.

...

~c.

~

...

,.

NOTE:

The

ceropenents

being!eferen~d

.in

..

,;

·

this

diSCl:JS$.ion

111~Y

b~jfo~md

jn"'either .

1:>.'

,'

Figure

4-7

orthe :;chernat1cs

in

s~t.•o!'l,7.fS.4.,::'.

-"'"

...

-..

-

:=.fl:.~~·;

~i

·~

•.

···"

...

,;j·:

.........

;.

Assuming::ste~dy-state

conditior.is,·the

lnvertimg·

input·

of the OP-AMP

(ZS)

seesreither~~

200m'l'.

or·

;.20Qmv.

·

depending

on

the status- ot:the; digital ·input., 'This

voltage is set up by

R13,

R14

and a resistor located in

pull-up package Z6(10). This steady-statewoltage

.on'·

the input mode

of··

ZS

is ourfconttol loop:·reference

voltage, V

REF•

The..Polarity

of

V

,REF

Js-d~t~n;nmed

Qy;·

the

sta.t._us

of

th~digit~f

;!_n,E_~t

l_ine,.

lf_.the

9iqital

:ll'lpu.

qs_

.'

HIGH,

y.

REF·

w.ill

be

+~fP~;,)f

Jhe

dl:g1tal

lnP':!t

1$

LOW,

V

REF

will_.be.~200r:nv

.....

· , ._ r . • ,

,.

.·.·

·

Since OP-AMP

(ZS}

is~o'!ng

'C?P1!n:icio.p

with.

eXtreme-

ly highgain,

i&.

satf.ir:ates..;.~Qd

~qur~e§J'.l~~

ourr:ent

for

01

O

if

positiv~y9r

q11.

;:.11

neg~~1ye.,r11

..

~

•.

SjitLtrat~s.

positiveand in tum drives 010 into saturation,

01~

WJIL

Pag(f].

7t.

·'·

·

~

...

..

!·

·,

.·

til'

••

·:

~

••

+av··;.,·

•

.:.

-24v

+48v

RET.

---------.

:!:24

..._

__

FROM--PO-WE_R

_su_PP-LY

_

__.~

+24v

RET.

+~.0---------1-1-----.

1

'~".'-

.......

•'>

.-12

•.

0-

.......

------1-1---.,

:·:

...

··

....

,.

.

..

·'.

t.

···.

...

.':·

..

~

,.

i.~

··~

,

~.~

-,

.·

·.'

'.

;+12v.0----

....

---t-t----::i.

WLTAGE

MONITOR

PRINT

HEAD

CONTROL

CARRIAGE

SERVO

.

CONTROL

14

PRINT

WIRE

DRIVE

.

}

CARRIAGE

SERVO

DRIVE

·.··

..•

,::

r ...

-

>·

l

..

r:~r

..

·'"

RIBBON

RUN/sroP

RIBBON

MOTOR

CONTROL

l-----f

..........

-0}

RIBBON

DRIVE

FIGURE~

Analog PowerBoard -Block Diagram -

+:!k.

...

-~

'::

i

<7=1"

·.'

~;·

! '

,1'0

•.•

'.

.

lllC•I

'

t;;·

:.

:~

"

~"\.;'

ID

.

~·~2··

~!!

I

llDIOR=--

.....

'.

'~

'

~:>~~;.··

:•' · 1

llDTOI•

I A

......

~.~

·~

"··~·

·~

'~.

.,

.,~

......

~

.~

;,

.I .

-n..

, FIGURE4-7

.

.·

§.

cp

Of

Paper

Feed

Drive Circuit

PAPEIRID

llOltlll

C1'fl

·

be

driven into saturation and the P

.·F.

motor current

will

be

sourced by the

+.

24V.

power supply. If

ZB

saturates negative,

it

will drive

Q11

into saturation and

in tumdrive

Q13

Intosafuration. This condition causes

the P.F. motor 9urrent

to

be

sourced by the

-24V.

power supply.

Since thesteppermotor

is

an

inductive device, It takes

a finite amount of rise-time

for

the current, lmotor,

to

begin to flow. As lmotor increases, the voltage across

Page8

thecurrent-sensing resistor,

R34,

begins

to

rise. When I"'·

lmotor reaches

200

ma,

(typical holding current) the · ·

voltage across

R34

is

200

mv. This voltage is fed back

to

the V

REF

node and nulls the reference voltage

causing the output

of

Z8

to

return

to

OV.

When this

occurs, the output drivers,

Q10

and

Q12,

or

Q11

and

Q13

are cut

off

and lmotor begins to. decrease. The

/91

feedback loop senses this at

R34

and causes

ZIU....o

·,

saturateagain. Knowing that

Z8

is running aquite

tr

) 1

open-loop gain and that

Q12

and

Q13

~'.:

tilgh-gain

Darlington type transistors, response time around the

control loop

is

quiteshort. This fact, coupled with the

dynamic characteristics

of

the stepper motor,

produces

an

oscillating control loop.

~

Because

of

this oscillating control loop, we are able

to

maintain our ·desired lmotor, but at the same time

reduce heat dissipation in the active devices. This

results

In

lower power consumption and increased

component life. .

To

step the P.F. motor, the digital Input must

reverse

,_.

its status. The edgeofthetransition

ls

differentiatedby :

A12

and

C14

producing a pulse at the V

REF

nodEit.

The -

polarity of the pulse is determined by the direction

of

the transition on the digital input. This pulse causes a

momentary increase in V

REF

and ·the control loop

obliges by momentarily Increasing the motor current

while reversing the direction

of

the current. As the

~

.

pulsedies away, the voltage returns

to

Its steady-state

level

of

200mv.

and the control loop returns the motor

current to itsnormal

200ma.

holding current. Note that

""

the current flow has now changed direction.

Intertec Data Systems SuperTerm User manual

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