1.8
ENVIRONMENTAL
SPECIFICATIONS
Ambient
Temperature
Humidity (non-condensing)
Altitude
(maximum)
1.9
WARNINGS
1.9.l
HIGH
VOLTAGE
•
OPERATING
10
to
4o
0
c
5
to
90%
10,000
ft.
HD
SERIES
SM1047
NON-OPERATING
-40
to
65°C
5
to
90%
40,000
ft.
High
voltage
may
be
present
on
CRT
anode
even
when
Monitor
is
not
operating.
(Never
assume
that
bleeder
resistor
has
discharged high
voltage.)
Flyback
transformer
(T2)
generates high voltages during Monitor
operation.
Any
conductive material placed close to transformer
can
cause
an
arc
to
jump
the
gap
between case
and
conductive
material.
This occurs
when
the
air
gap
ionizes
and
becomes
a conductive path.
1.9.2
CRT
Handle
CRT
with
care.
Since
CRT
contains high
vacuum,
breakage
may
cause
injury
from
flying
glass.
Do
not hold
CRT
by
neck since pressure
on
neck
may
cause
CRT
breakage. Discharge
CRT
high voltage before servicing Monitor. Following
procedure
is
recommended:
Equipment
Required:
1 - Clip lead with
alligator
clips,
both ends.
1 -
Flat-blade
screwdriver with long
thin
shaft
and
insulated
handle.
Insure handle
is
clean
and
free
from
foreign
material.
a. Completely disconnect Monitor.
b. Attach
one
end
of
clip
lead to aquadag spring.
c.
Attach
other
end
of
clip
lead to
center
portion
of
screwdriver
shaft.
d.
Grasp
screwdriver handle well
away
from
screwdriver
shaft.
Use
one
hand
only. Throughout discharge procedure
do
not touch
any
thing with
free
hand.
e.
Slip
screwdriver blade
b~tween
anode
cap
and
CRT.
Anode
cap
may
tend
to
stick
making
ft
necessary
to
gently pry
up
edge
of
cap.
f.
Carefully
push
screwdriver blade to
center
of
anode
cap
and
touch blade to
metal anode.
If
CRT
has
not
been
discharged
by
bleeder
resistor,
a
notice-
able spark will generally
result.
g. Screwdriver-anode contact
must
be
maintained for a
minimum
of
five
(5)
seconds.
h.
Anode
cap
may
be
safely
removed
at
this
point.
1.9.3
X-RADIATION
Replacing
T2
and/or
Ll
with components
of
different
design or manufacture
may
result
in
x-radiation
in excess
of
minimum
safety
levels.
Supplying Monitor with excessive voltage
may
also increase
x-radiation
beyond
minimum
safety
levels
if
built-in
overvoltage
protection
circuit
is
inoperative
or misadjusted.
1-5
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