PROTECTION
CIRCUITS
The
MTC
9000
is
provided
with the
following
protection
circuits:
a)
Protection
against
excessive x-ray radiation.
This
circuit
is
obligatory
in
many
countries,
and
ensures that, with
the
worst
cathode-ray
tube
and
with a
breakdown
in
any
part
of
the
monitor, x-ray
radiation
will not
exceed
0.5 mR/h .
This
is
the international safety limit; however,
in
practice,
statistical measurements
made
on Hantarex
production
show
that
radiation
never
exceeds
0.1
mR/h.
b)
Protection
of
the Power Supply Unit.
This
circuit protects the
power
unit from
accidental
short-circuit which
could
happen
during
installation or adjustment
of
the monitor.
DEGAUSSING
CIRCUIT:
Demagnetizing
time
5 s
Time
between
successive
Demagnetizations < 30 min.
NOTE:
•
The
monitor must
be
left switched-off
between
successive de-magnetizations.
•
Normally
the
degaussing
circuit
operates
automatically
each
time
it
is
switched on; there
is
available
, on request,
an
accessory
comprising
a
connector,
a
cable
and
a push-button,
which
provides for
manual
operation
of
the
de-gaussing
circuit
.
BEAM
CURRENT
LIMITER:
FUSES:
NOTE:
Level
of
1imit
F1
F2
1
mA
approx
.
2
AT
(slow-blow)
3
AT
(slow-blow)
Fuse
F1
protects
the
whole
monitor with
the
exception
of
the
de-gaussing
circuit
.
Fuse
F2
protects
the
de-gaussing
circuit
only.
INSTALLATION
a)
Connect
to the
power
source as follows via
connector
CC:
Contacts 1-2 to
an
isolated source (see note)
of
alternating
current
at
128V, 50-400
Hz
capable
of
supplying
100VA.
Alternatively
one
may
use a
direct
current
supply
in
the
range
155-200.
V,
irrespective
of
polarity,
subject
to
its
being
isolated from chassis or earth, as, for
example,
one
of
the
Hantarex series
US
200/US 250/US 300. (see the note)
Contacts 3-4 to
the
mains supply
at
220-240 V a .c., 50-60
Hz.
b)
Connect
to the signal source as follows via
connector
CA:
Contact
1 positive
video
signal
BLUE
(B)
Contact
2 positive
video
signal
GREEN
(G)
Contact
3 positive
video
signal
RED
(R)
Contact
4
common
signal
earth
(GND)
Contact
5 vertical sync.
(V
SYNC)
(or no
connexion
if
using
composite
sync.)
Contact
6 horizontal or
composite
sync
(H
SYNC)
Important
The
use
of an isolating transformer
is
obligatory;
it
needs a power
capacity
of at least 1
OOVA
and
to
be
constructed to
meet
local safaty regulations. Hantarex accepts no responsability for any harm to persons
or
property resulting from non-observance
of
this
warning.
) Important
It
is
obligatory that the direct current source
shall
be
«floating», i.e. without any reference
to
earth
or
chassis,
such
as
in
the
case of the Hantarex
US
200/US
250/US
300.
c)
Connect
the
Earth wire to the
metal
structure as
prescribed
by
safety regulations.
d)
Set the sync. selector switch
(SW4)
to
adjust
the
monitor for
the
type
of
synchronizing signals
available;
SW4
functions
on
both
composite
sync.,
and
on
separate
sync. (simultaneously).
e)
Set
the
input selector
SW3
to
adjust the monitor to
accept
the
level
of
video
signal
available;
the
monitor functions
in
the
range
1.5 - 5 V p .p.
f)
If
necessary
is
possible
to
invert
the
image
(vertically
and
horizontally)
by
inserting the
connector
to
the
deflexion
yoke
in
position
CL
.
g)
If
it
is
necessary
to
adjust
the
controls on the
removable
control
panel
(either with the
panel
inserted
in
the chassis
or
connected
via
its
extension
lead)
the
image
characteristics
are
optimized
as follows:
H freq. - horizontal scan
frequency
Adjust within the
range
15.625 +/- 0.3
kHz
to
obtain
the
most
stable
display.
V freq. - vertical scan
frequency
Adjust from the
condition
where
the
image
scrolls
upwards
to
obtain
a
stable
display
.
V ampl. - vertical
scan
amplitude
Adjust for
optimum
display
height.
H ampl.- horizontal scan
amplitude
Adjust for
optimum
display
width.
H phase - horizontal
phase
Adjust for
correct
horizontal positioning
of
the display.
V
shift
- vertical shift
Adjust for
correct
vertical positioning
of
the
display
.
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