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'
3.2
Access
io
THE
kan
Loelc
ßoARo
The
Facit
TWIST
should
be
installed
on
a
firm
1
Switch
off
the
unit
and
disconnect the
Key-
surface.
The
display
unit
tilts
on
its
stand
to
board
from the
Display
unit.
Turn
the
Key-
allow the
user
to optimize
the viewing
angle.
board
over
and
remove
the
six
screws
holding
The
keyboard
connector plugs
into
the socket at
e
the top
and
bottom cover
together.
the
right
side
of
the
display
unit.
The
key-
board
may
then
be
positioned to
best
suit
the
2
Separate
the
two
halves
to
obtain
access
to
USGP-
the
printed
circuit
board.
Make
sure
that
the
mains
supply
lead
is termi-
3
To
reassemble
the Keyboard, put the
two
hal-
nated
in
a
suitable
plug
for
the
local
power
ves
together.
Before
securing the
screws,
outlet
(a ground connection must
be
incorpora-
check
that
the
printed
circuit
board
fits
ted).
See
section 2.2.
into
the
slot
at the
front
of
the bottom
3.1
ACCESS TO THE
MAIN LOGIC
BOARD
IN DISPLAY
UNIT
T
plate
and
that
the
circuit
board
is positio-
ned
correctly
so
that
all
keytops
moves
free
from
the top cover.
F»
'\
4,
)
-~"
Access
to
the
MLB
is
gained
as
follows:
Q*
e
<š>
.
\
1
Swltch
°ff
the
U"lt
a"d dlSC°""@Cf
fV°m
the
MWMWMWMWWF
MWMWWNWNN
mains
supply.
Ensure
that
there
is
a
stable
flat
surface
behind
the
unit,
large
enough
to rest
the
back
panel on,
when
it
is
folded
¿>
'
"'
""
""
"_"
TE;
-
down
2
Unscrew
the outer
six
(6)
screws
from
the
rear
of
the Display
unit.
3
Cabl
es
eenneeted
te
the
rear
panel ere
lens
s.
enough
to
allow
the
MLB
and
PSU
to
be
servi-
.eåïëäåââääåäåäl~_,_
câg
without disconnecting
the
internal
cab-
Je
ifc,åääå%%šššš%%%šššåáššš%š â%_
_
MgÜääàåäåäšëšääåå
4
To
refit
the
rear
panel,
first
rise
it
and
§=*=äå===!f;::Û"1gÉää%:¿í;%¿?7
engage
the three tabs
at
the
bottom
edge
in
g
ftešåäïï
their
slots
at the
back
of
the
main
casing.
T
,
Close
the
rear
panel
and
secure
it
with
the
\
T
:Q
six
securing
screws.
f
J
iaïi
A'
0
L
V/f
\\
|\'\
|l-
Ü
FW
FIG
3.2
KEYBOARD
DISASSEMBLY
I
The
volume
potentiometer
is
accessible through
the
rear panel,
see
Fig
4.1,
for details.
x
"\
'
3.3
ksvcuck
Ann
BEWLL
voLvME
Aoausmeni
I
3.4
JUMPERS
The
Main
Logic
Board has seven
pug-in jumpers,
-
which are
used
as
links to
alter
certain
inter-
face
functions
on
the
board
as
detailed in
the
OL:?::]
table
below. In
some
cases,
e.g.
H5,
the jumper
socket
has
three pins.
The
connections
made
possible
by
this
arrangement are
referred to
as
W5:1
or
w5:2,
as shown
in Fig 3.4.
FIG
3.1
REAR
PANEL
o1sAssEMßLYi
"'.."'
T
'."J
i
FIG
3.4
3-pin
Jumper
Notation
T
T
W
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