Facit 4431 Original operating manual

I

'DETAILED

LIST

OF

CONTENT

AT

PAGES

42-43

~

SERVICE INSTRUCTION 4431

Edition 1

Pub

1•

No.

1160

82

17-12/8

Eng.

DECEMBER

1982

K.F.

Printed

in Sweden

VIDEO TERMINAL ......

__

Facit

AB

·

Technical

Service

Department

·

S-597

00

ATVIDABERG

·SWEDEN

2

SCOPE

OF

THE

MANUAL

The

information contained in

this

manual

is

in-

tended

for

the maintenance group,

other

avail-

able documents are:

Facit

4431

Technical Description

Facit

4431

Operator

Guide

INT

R 0

DUCT

I 0 N

_______

_

As

with

any

electronic

equipment,

all

standard

safety

precautions should

be

observed while

servicing

the

Facit

4431

Video

Terminal.

Any

servicing

which

requires

opening the

cabinet

must

be

performed only

by

qualified

service

personnel.

***********************************************

WARNING

Hazardous voltages are exposed

when

the

cabinet

top

is

removed.

Use

extreme caution

when

servi-

cing the monitor assembly or

power

supply.

Un-

der

certain

conditions dangerous

potentials

may

exist

even

when

the

power

is

off

due

to the

cathode ray tube.

***********************************************

In

the

text

and

on

the schematics,

locations

are referenced in the following manner:

Part

number

(IC

number)

(:pin

number)

(Signal

name)

(Schematic page).

Example:

Reference

to

19

of

D71

located

at

page

MEM

Circuit

Diagram:

D71:19

RD

ATT.(MEM)

Acronyms

and

Abbreviations:

Main

Logic

Board

Schematic Drawings:

IJO

Input/output

interface

KBD

Keyboard

interface

MEM

Display Refresh

RAM

CPU

Processor

SG

Sync

Generator

VG

Video

Generator

Devices:

CPU

CRT

CRTC

EAR

OM

EPROM

LED

RAM

ROM

SIO/DART

Central Processing Unit

Cathode

Ray

Tube

CRT

Controller

Electrically

Alterable

Read-Only

Memory

Eraseable Programmable Read-Only

Memory

Light Emitting

Diode

Random

Access

Memory

Read

Only

Memory

Serial

Input/output or

Dual

channel

Asynchronous Receiver/Transmitter

1.1

DESIGN

The

terminal

consists

of

three

major physical

subassemblies:

the

Main

Logic

Board

(MLB)

the Keyboard

(KBD)

the Monitor assembly

and

the

Power

Supply

(PS)

The

majority

of

servicable

components are

on

the

Main

Logic Board,

which

provides

six

(6)

major

circuit

functions:

1.

Keyboard

Interface

2. Microprocessor Control

3. Input/Output

Interfaces

4. Display Refresh

Memory

5. Synchronization Generator

6.

Video

Generator

Chapter 6 contains a general

circuit

descrip-

tion

and

each of

these

circuits

are described

in

detail

in Section 7 of

this

manual. A block

diagram showing the

main

functional components

of

the

terminal

is

given in Fig

7.1.

The

rest

of

Section 7 describes

how

these

components

combine

to

perform

all

terminal

operations.

1.2

SPECIFICATIONS

Monitor

Screen

capacity

Characters per

line

Number

of

lines

Screen

Tube

size

Veiwing

area

Character

size

Referesh

rate

Scan

method

Character generator

Frequency

Interface

CCITT

V24/RS-232-C

Current

Loop

(Optional)

1920/3168

characters

80/132

25(24 +

status

line)

Green

phosphor,

P42

C

Non

glare

with

medium

short

percistance

(300uS)

30.5

cm

(12") diago-

nal

310

sq.

cm

(48

sq.in.)

20

cm

x

15

cm

(8"x6")

rectangele

(centered

on

screen)

+/-0,2"

(80col)

5mm

high x 2

mm

wide(0.2"x0.08")

(132col)

5mm

high x

2mm

wide

(0.2"x0.05")

50

or

60Hz

Raster

128

displayable

char.

(inc.

space)

Alterna-

tiv

set

possible

7 x

9

character

defini-

tion

with 2 dot sepa-

ration

between cha-

racters.

15

700Hz

+/-

500Hz

Composite video output (Optional)

Protocols

Environmental Conditions

Temperature

Voltages

Frequencies

Consumption

Dimensions

Display Unit

Width

Depth

Height

Keyboard

Width

Depth

Height,

rear

Height,

front

Total weight

Data

format

Data

bits

Data

bit

8

Parity

Data

transfer

rate

Operator

controls

Switches:

ON/OFF

X-ON/X-OFF

protocol

10°

to

4o

0c

rational)

-10°

to

6o

0c

(storage)

117V

220V

49-61Hz

65

Watts

32.6cm

(12.8")

40.2cm

(15.8")

37cm

(14.7")

43.8cm

(17.25")

26cm

(10.2")

6.4cm

(2.5")

1.0cm

(0.4")

20

Kg

(44lb)

(ope-

8 or 7 asynchronous

0 or deleted

Odd,even

or

inhibited

75

to 19.200

bits/-

sec.

2 R E C E I V I N

G,

U NP A C K I NG

AND I NS

PE

CT I 0 N

_____

_

The

Facit

4431

terminals are

carefully

packed

to insure

safety

during shipment, however,

when

the terminal

arrives

check

the following:

• the invoice against your

original

purchase

order

•

examine

the outside of the shipping

contai-

ner

closely

for signs of abuse or

damage

in

transit

A chrushed or punctured carton

naturally

calls

for a careful inspection of the contents,

if

any

damage

is

found

inform the delivery agent

about

any

damage

found.

3

2.1

POWER

AND

SIGNAL

WIRING

The

4431

terminal wiring

consists

of

an

AC

po-

wer

cord

which

is

included with the display

unit.

The

keyboard

is

connected

to

the display

unit

by

a

flexible

coiled cable.

The

V24/RS232C

sig-

nal cables are provided

by

the customer.

2.2

POWER

ON/PERFORMANCE

CHECK

Inspection before

power

on:·

• check

that

the

model

plate

corresponds to

order

and

packing case marking

• check for proper keyset

• check

that

accessories

and

documentation are

supplied

• check,

and

if

not appropriate, modify the

power

connection to your national standard.

Make

sure

that

proper grounding

is

performed

and

that

proper voltage

is

selected.

Also

check fuse value, should

be

0.5Amp

slow

at

220/240Volts

and

1Amp

at

115Volt.

Power

On

This

test

require a Test gear such

as

Facit

Text Generator or a

4208

Casset Drive with spe-

cial

Demo

or Test program.

NOTE:

Before connecting the terminal to

ANY

external data source, see to

it

that

the

ter-

minal

is

connected to the

Mains

with proper

grounding,

this

procedure will take care of

any

eventuall high voltage discharge through the

interface

cable causing

damage

to the Line

dri-

ver/Receiver

circuits.

• wait approx. 1 minute to observe

normal

screen illumination (the

raster

may

be

vi-

sible

during

few

minutes of

warm

up).

•

upon

power-up

all

seven

LED's

will

be

lit

for

about 0.5 sec.

The

country/product se-

lect

code

is

displayed

on

the

LED's

for

ap-

prox. 1 second (See the country/product se-

lect

table

below).

LED's

Meaning

xxx

xxOO

4420

xxx

xx10

4430

xxx

xx11

4431

000

xx

us

001

xxxx

Swe/Fin

010

xx

Germany

011

xxxx

Denmark

100

xx

Britain

101

xx

Spain

110

xxxx

France

111

xxxx

Norway

4

NOTE

If

during

initialization

a suspected

fault

is

detected, the bell will ring 5 times

and

an

error

code

will

be

displayed in the

up-

per

left

portion of the screen.

If

the terminal

halts

with

all

the

LED's

on,

then the processor

has

determined

that

the scratchpad

RAM

D72

is

defective

and

no

furhter

tests

are attempted.

ERROR

CODES:

2

4

display

memory

fault

EAROM

parity

error

EAROM

checksum

error

(For

instruction

how

to

repair,

see Chapter

10)

• disconnect the keyboard

from

the terminal

and

power

on

the terminal,

after

approx. 5

sec. a presentation of the terminal

program

revision

is

shown

at

the upper

left

corner

of the display.

Ex.

FACIT

4431

rev.

"D.X."

9/82

1

if

no

fault

is

detected

you

may

continue

with the performance check,

first

enter

Set-

Up

mode

and

do

as

follows: (use the Operator

Guide

as

reference

if

necessary)

1

SET-UP

A.

a

change

the brightness

setting

using cursor

up

for increased brightness

and

cursor

down

to

reduce the brightness,

minimum

brightness

should

be

with the half

intensity

area

just

visible,

if

the

intensity

need

adjustment, see

chapter 9 for

instructions.

b depress

key

(3) to

clear

all

tabs,

move

the

cursor

and

depress

key

(2) to toggle

Change

Tabs,

set

the tabs in

random

positions. Reset

the terminal

and

check

that

the

Tabs

are in

proper positions again,

when

entering the

SETUP

A

mode.

c depress

key

(9)

to

enter

into

132

column

mode,

control

that

the

left

or

right

margins of

the screen

does

not fold back,

if

so

adjustment

is

needed

and

is

explained in chapter 9. Enter

80

column

mode

again.

d depress

PF1

and

PF2

and

to

change

pages, see

upper

right

corner of the screen.

e

enter

SET-UP

B,

depress

key

(5),

move

cursor

and

toggle the displayed switches

by

using

key

(6),

set

all

(1) to (0)

and

all

(O)

to (1) (no-

te

that

in

column

3 switch 4

can

not

be

changed

from

0)

and

change the T

SPEED

and

R

SPEED

to

75

by

depressing of

key

(7)

and

(8). Recall fac

tory

settings

by

depressing the

Shift

key

and

R

at the

same

time,

(SHIFT)+(R).

Return to

SET-UP

B

mode.

f depress

key

(5) to enter

SET-UPC

mode.

Make

the

same

procedure

as

above

with the displayed

switches

and

the

printer

speed.

Note

that

in

column

4,

switches 2,3,

and

4

can

not

be

chang-

ed

from

0.

g

reset

the terminal. Enter

SET-UP

A

and

set

the terminal in

LOCAL

MODE,

depress

key

(4).

h depress

(ESC)

(Shift

+

3)

(8)

(The

termi-

nal

must

be

in

ANSI

mode).

This

command

fills

the

entire

screen area (exept

row

25)

with E's

for screen focus

and

screen geometry alignment.

If

any

adjustment

is

necessary see chapter 9

for advice. Reset the terminal.

i with the terminal in local

mode,

test

all

keys

for proper

movement

and

function.

j connect a

suitable

data source to the 1/0

connector

and

a

Printer

to the

Printer

connec-

tor,

use

speciall

test

program

or

demo

program

for

this

test.

k depress

(ESC)

(5B)

(2)

(;)

(9) (y).

Note

that

the

key

for the

5B

Hex

code

is

to

be

se-

lected

by

the aid of National version keyboard

code

and

command

summary

listing

in the Techni-

cal description

for

the

4431

terminal. This

com

mand

initiates

a

series

of special

tests

for

use

by

servicing personnel.

The

test

is

repea-

ted

until

a

failure

occurs or

until

the

power

is

switched

off.

•

Finally,

fill

in

and

send the

test

report

to

Facit

AB,

Technical Service

Department

S-597

00

Atvidaberg

SWEDEN

3

INSTALLATION

_______

_

3.1

INITIAL

SETTING-UP

The

Fa~it

4431

display unit should

be

positioned

on

a firm surface; the display unit

tilts

on

its

stand to allow the user to optimise the viewing

an~le.

The

keyboard connector

(at

the

end

of the

coiled connector lead) plugs into the

rear

of

the display

unit,

in the lefthand socket (viewed

from

the read, see Fig).

The

keyboard

may

then

be

positioned to

suit

the user.

~nsure

~hat

the

mains

supply lead

is

terminated

in

a

suitable

plug for the local

power

outlet

(a

ground

connection

must

be

incorporated).

Refer to section 4 for

interface

connections

to

both the host

and

local

printer

(if

required).

3.2

ACCESS

TO

MAIN

LOGIC

BOARD

IN

DISPLAY

UNIT

The

user will

need

access

to

the

main

logic

board

to

alter

the

setting

of jumpers described

in sections

to

and

access in gained

as

follows:

Switch

off

the

unit

and

disconnect

from

the

mains

supply.

2 There are four slot-head

fixing

screws

which

retain

the display unit top cover. These are

located

at

the bottom of the cover, under the

lip,

close to

where

the stand

enters

the

dis-

play

unit

body.

The

screws

can

be

accessed

from

below

by

means

of a short screw-driver.

To

remove

the cover the screws

must

be

scre-

wed

IN

(clockwise)

as

far

as

they will

go.

3

Grasp

the

lip

of the cover

on

each

side,

pull

outwards

and

simultaneously

lift

the cover.

4 Access to the jumpers

on

the

main

logic board

is

now

possible.

5 Replacement of the cover

is

the reverse of

the removal.

The

retaining

screws

must

then

be

screwed

OUT

(anticlockwise) as

far

as they

wil 1

go.

5

FIG

3.1

5

3.3

ACCESS

TO

KEYBOARD

PCB

The

user will

need

access

to

the keyboard

p.c.b.

to allow the

setting

of jumpers described in

sections

and

access

is

gained as follows:

Switch

off

the unit

and

disconnect the key-

board

from

the display

unit.

2

Remove

the

two

retaining

screws

at

the

right

hand

end

of the keyboard,

and

then

remove

the

end

cap.

3 Slide out the printed

circuit

board (discon-

necting the loudspeaker lead

if

necessary)

and

lift

off

the top

plate.

4

The

jumpers

and

associated

components

are

to

be

found

along the top of the

p.c.b.

5 Reassembly of the keyboard

is

the reverse of

the above. Ensure

that

the

p.c.b.

and

top

plate

slide

in the

retaining

grooves in the

keyboard housing.

3.4

KEYCLICK/BELL

VOLUME

ADJUSTMENT

The

audible tones produced

by

the

unit

are gene-

rated

by

a small loudspeaker

mounted

in the key-

board.

The

level of

sound

produced

may

be

adju-

sted

by

rotating

(by

means

of a small screw-dri-

ver) the

SPKR

VOL

ADJ

potentiometer. This

is

located in the

left

hand

top corner of the key-

board

p.c.b.

1

Rear

panel

2

Top

cover

3 Monitor

(CRT)

retaining

screws

4 Front panel

5

Volume

adj. pot

6

End

cap

screw

-<111111@

6

---c@

6

3.5

JUMPERS

ON

THE

MAIN

LOGIC

BOARD

Jumper

W1.

With

jumper

W1

inserted,

+5V

is

app-

lied

to the

I/0

connector pin 18.

Jumper

W3.

This jumper

makes

it

possible

to

choose

either

2716

or

2732

as

character genera-

tor

(D40).

See

Fig 3.3

for

details.

Jumper

W4.

Inserted Test

mode,

(factory

test

only).

Jumper

W5.

Inserted

EROM

Write Enable.

3.5.1

KEYBOARD

PCB

Two

groups of jumpers are

fitted

to the keyboard

PCB.

3.5.1.1

Facit

4431

Selection

(W2)

Jumper

W2

on

the keyboard

PCB

must

be

fitted

for

Facit

4431

operation.

Jumper

W1

is

not

fitted.

O

SPKR

VOL

ADT

W1

W2

:I'~

SET

UP

BREAK

3.5.1.2

National

Keyboard

Selection (W4,5,6)

Jumpers

W4,

W5

and

W6

on

the keyboard

PCB

are

used

to

select

which

country the keyboard

is

for

use

in.

Jumper

W3

is

not

fitted.

The

table

below

shows

the possible combinations.

The

keyboard

will

be

supplied

set

to

one

particular

configu-

ration

with appropriate keytops

fitted.

If

a

change

is

made

to the

jumper

settings

the key-

tops should also

be

changed

(and

a

new

character

generated

ROM

fitted).

Country

U.S. (ASCII)

Sweden/Finland

Germany

Denmark

Britain

Spain

France

Norway

E

W4

WS

0

C::::>

Ill

W4

Down

Up

Down

Up

Jumper

W5

W6

Down Down

Up

Down

Up

Down

Up

Down

Up

Up Up

Down

Up

FIG

3.2 Keyboard

PCB

Jumper Locations

3.5.2

MAIN

LOGIC

PCB

There are 4 jumpers

fitted

to the

main

logic

board

as

shown

in Fig 3.3.

3.5.2.1

+5V

on

I/0

Connector

18

(W1)

18

on

the

I/0

connector

may

be

linked to

+5V

by

fitting

jumper

W1.

+5V

on

18

is

required

by

the

Facit

5165/66 Current

Loop

Adapter.

When

the

jumper

is

not

fitted

18

is

connected in-

ternally.

3.5.2.2

Standard/Extended Character Generator

(W3)

When

the standard

character

generator

PROM

is

fitted

(type

2716)

the jumper

W3

must

link the

centre

and

right

hand

pins (see Fig

3.3).

When

extended

character

generator

is

used (type

2732)

the jumper

must

link

the

centre

and

left

hand

pins.

7

3.5.2.3

Production Test

(W4)

This jumper

is

used only during production.

It

must

not

be

fitted

during

normal

operation.

3.5.2.4

Disable/Enable

Save

(W5)

The

user

may

prevent the operator saving

alterna

tive

Set-up parameter values (using the

SAVE

function)

by

removing the jumper

W4.

When

this

jumper

is

fitted

the

SAVE

function

works

as

de-

scribed in

section

5.

~----------------------------·--------------

DODD

~Ows

DD

.

1

on

I I

L__J

D

DDlJ

DOD

CJ

D

~

I I

D

[l D I I

On I I

LJ

DD

D

DD

Do

D

DODD[

W1

= =

FIG

3.3 Main Logic Board

8

4 I NT E R F A C E

INFORMATION=

The

interface

connectors

at

the rear of

terminal are

shown

below.

4.1

V.24/RS-232-C

COMMUNICATION

INTERFACE

the

The

pin assignments for the 25-pin

male

V.24/RS

-232-C

communication

connector are

as

follows:

Connector

Host Terminal

1 Ground

2 Serial Data

Out

_..3 Serial Data In

~

-4.

4 RTS (always high)

5 CTS (Required) -note

-..

.....

6 DSR (Ignored)

7 Signal Ground

8 CD (Ignored,

but

monitored)

-.. 18

+5V

-note 3

-4.

19

READY/BUSY

-note 2

...._

20

-...-

DTR

(Alw'!Y._s

hj_g_h)

NOTES:

(1)

CTS

signal

must

be

present

at

the

terminal (high) before data

can

be

sent to the host.

(2)

READY

=

High

BUSY

=

Low

(3)

+5V

for Facit

5166

current

loop

adapter, supplied

by

fitting

a

jum-

per

on

the

main

logic board.

4.2

V.24/RS-232-C

PRINTER

INTERFACE

The

pin assignments for the female

V.24/RS-232

-C

printer

connector are

as

follows:

Connector

Printer Terminal

1 Ground

2 Data In

(X-ON/X-OFF

from

printer)

3 Data

Out

7 Signal Ground

18 Not used

~~~~~~~~~~~-

19 Printer

READY/BUSY

-note

NOTES:

READY

High

BUSY

Low

4.3

CURRENT

LOOP

INTERFACE

Current loop

interface

adapter

may

be

fitted

onto the

I/0

interface

connector

(Facit

5166)

of the

Facit

4431.

The

terminal connectors

may

be

internally

linked (via jumper), to provide a

+5V

supply to the adapter,

which

is

all

that

is

required

for

passive/passive operation.

Where

the user wishes to

employ

an

active

transmitter

an

external

12V

supply

must

be

provided.

4.4

COMPOSITE

VIDEO

OUTPUT

The

Facit

4431

provides a composite video

for

use with

an

external video device.

The

compo-

site

signal

is

a combination of the video

sig-

nal

and

horizontal

and

vertical

synchronisation

signals.

Connection

is

via a female

phono

con-

nector.

The

output

impedance

is

75

ohms.

The

video signal

is

of the

RS170

type.

5 S E T - U P

FEATURES

___

_

5.1

GENERAL

FEATURES

OF

SET-UP

MODE

Set-Up

mode

is

entered

by

depressing the

(SET-

UP)

key

on

the keyboard.

Initially

the

SET-UP

A

display

is

shown.

At

any

time in the

SET-UP

mode

the operator

may

adjust the brightness of the screen, switch

between

on-line

and

local operation, change or

recall

the

EAROM

values or

reset

the terminal

to

its

initial

state.

Exit

from

Set-Up

mode

(A,

B or

C)

may

be

at

any

time pressing the

(SET-UP)

key

again.

On

exit

from

SET-UP

mode,

the parameter value are pre-

served

and

will

be

displayed again

whenever

SET-UP

mode

is

entered (exept

after

Power

Off)

You

will find a

detailed

information about the

SET-UP

mode

in the Technical Description.

5.2

SET-UP

MODE

SUMMARY

GENERAL

SET-UP FEATURES

(SET-UP

A,

Band

C)

Line/Local

Screen Brightness

Save Set-up Features

Recall Set-up Features

Recall Factory Settings

Recall Factory Tabs

Reset Terminal

SET-UP B

[4]

to

toggle

[t1

to

increase

[

~

1

to

decrease

[SHIFT] +[SJ

[SHIFT].+[R]

[SHIFT] +[DJ

[SHIFT] +[T]

[OJ

SET-UP A

Change Tabs

Clear

All

Tabs

80/132

Column

Page 1/Page 2

Set-up B

[2]

to

toggle

[3]

[9]

to

toggle

[PF1] I [PF2]

(80 column, 2 page mode)

[5]

Set PF Keys sequence

Set Answerback message

T0ggle displayed switches.

[SHIFT] +[PFx] [delimiter] sequence[delimiter]

(x"'

1

to

4)

[SHIFT] +[A] [delimiter] message[delimiter]

Increment T SPEED

Increment R SPEED

Set-up C

SET-UPC

[6]

[7]

[8]

[5]

Toggle displayed switches [6]

Increment PRINTER SPEED -

Set-up A [7]

or

[8]

[6] 1) DISCARD "XOFF/XON

FROM

HOST"(O•OFF,1•0N)

2) CHARACTER

TO

HOST

(limited

to60cps/unlimited

9

10

6

GENERAL

BLOCK

DIAGRAM-

0

ES

CR

IP

TI

0 N

________

_

6.1

MICRO-PROCESSOR

CONTROL

UNIT

The

Facit

4431

terminal

is

based

upon

the

Z80A

Microprocessor.

The

principal function

is

to

decode each character

as

it

is

received (from

keyboard or host computer),

detect

characters

and

character sequences representing terminal

commands,

and

obey

these

commands.

The

micro-

processor also performs background tasks of

keyboard scanning,

character

and

cursor

blin-

king, bell generation, loading the

display

re-

fresh

RAM

starting

address

for

each of the

25

display

rows,

and

various other

real-time

functions.

The

microprocessor

controls

all

communication

on

the

CPU

bus, reading data

from

the

EPROMS,

EAROM,

display

refresh

RAM,

SIO,

and

the keyboard,

and

writing

to

the

dis-

play

refresh

RAM,

SIO,

CTC,

CRTC,

EAROM,

and

various hardware

latches.

A block diagram of the Microprocessor control

unit

is

shown

in Fig 6.1.

TO

OTHER

CIRCUITRY

~

TO

OTHER

{

CIRCUITRY

•

• 3

•

POWER

ON

RESET

NMI

FROM

(SG)

INT.

FROM

.---

(

I/O)

_t_

~

ZBO

A

.._

DATA

BUS

~

ADD

BUS

:-

CPU

CONTROL

4

..

D42

• •

_t_

CLOCK

• •

..

1-8

SCRATCHPAD

....

1-11

...

RAM

~

D72

2k

x 8

PROGRAM

8 •

...

PROMS

16

-

....

12

(24)k x 8

-

D73,74,75

•

WAIT

STATE

J

GENERATION

14-

MEM

SHARE

ADDRESS

~

Dl4,31,32

Dl7

D9

DECODING

&

CONTROL

ro

(KBD)

4---

D26,24,25,36,15,34,16

~

EAR

OM

~

EAR

OM

TO

(I

Io

4----------j

ET.

AL

D63

JJ

CONTROL

TO

(SG)

-.

LATCH

D65,64

TO

(VG)

4-

TO

M

4-

( )

FIG

6.1

MICROPROCESSOR

CONTROL

UNIT

Facit 4431 Original operating manual

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