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SCOPE OF THE MANUAL
This
manual
is
intended
for
the
maintenance
group
and
contains information
about
faultfin-
ding,
repair
and
adjustments.
Other
available
documents
are:
Technical
description
Publ.No.
1103 89
34-00
Operators guide
Publ.No.
1103 89
35-00
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Ü
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00
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1..-ett-ett-ett-11.-1:.-1:.-2:.-1:--1:--22--1:--12%-1:1-:ti-2:1-2:2-1:1-atiqztâ
control
Synchronization generator
Address
multip
Display
memory
lexor
Input/Output interfaces
EAROM
control
1
I
N
T
R
0
D U C
T
I
0
N
c
As
with
any
electronic
equipment,
all
standard
safety precautions
should
be
observed
while
servicing
the
Facit
TNIST
Video
Terminal.
Any
servicing
which
requires
opening
of
the cabinet
must
be
performed
only
by
qualified
service
personnel.
***********************************************
W
A
R
N
I
N
G
Hazardous
voltages
are
exposed
when
the cabinet
is
removed.
Use
extreme
caution
when
servicing
the monitor
assembly
or
power
supply.
Under
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:
Example:
Reference from
CPU
to
CRTC
schematic.
Signal
name,
schematic
(page
no.)
and
coordi-
nates
on
schematic.
SIGNAL
NAME
PAGE
COORDINATE
wR.wA1T
(2
Ez)
1.1
besreu
IIIn-__n-nunnnnnnnnnnnnnunnununnnun-n
The
Facit
TWIST
Video Terminal
consist
of
five
major
physical
subassemblies:
-
the
Main
Logic
Board
(MLB)
the
Data
Graphic
Display
tube
(DGD)
the Monitor Control
Boards
(MCB)
the
Power
Supply
(PSU)
the
Keyboard
(KBD)
*
The
majority of
serviceable
components
are
on
the
Main
Logic
Board, which
is
mounted
to
the
The
switching
power
supply
is
built
up
on
one
printed
circuit
board.
The
PSU
is
mounted
to
the
rear
cover
and
contained
in
an
aluminium
case.
.
The
Monitor Control
is
built
up
on
two
(2)
Printed
Circuit
Boards.
One
board
is
mounted
to
the Display
Tube
Socket Connector
and
the other
board
to
a
support bracket at the
bottom
of
the
Cabinet.
_
The
keyboard
is
using
a
masked programmed
6801
type microprocessor.
The
communication
with
the
terminal
Main
Logic
is
performed
through
the
flexible
coiled
cable
via
a
serial
(V24/RS-232)
interface
using
2400
baud.
Power
is
fed
to
the
keyboard
from the
terminal
through the
same
ca
e.
1.2
SPECIFICATIONS
MONITOR
Display format:
24
lines,
80char/line
+
a
25th
status
line
or
"twisted"
72
lines,
80char/line
+
73rd
status
line
No
of
pages:
3
pages
of
24
lines
or
1
page
of
72
lines
Screen:
15
inch white
or
amber,
non
glare
high
resolution
40MHz
~
monitor,
65Hz
refresh rate
Character Set:
128 + 128
ASCII
Character
cell:
20 x
16
matrix
(landscape)
16
x
7
matrix
(portrait)
INTERFACES
One
I/0
port
and
one
CCITT
V.24/RS-232-C
20mA
intelligent printer
Current
loop
(option)
port with:
V.11/RS-422
(option)
Data
rate:
75-19200
bps
split
speed
LINE
PROTOCOLS
COMMANDS
PROTOCOLS
XON/XOFF
Soft selection
5
Ready
/
Busy
ANSI
No
protocol
NON-ANSI
CUSTOM
MODE,
soft defin-
rear
panel
and
provides
six
(6)
major
circuit:
ab1e
functions:
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