7.
After you reassemble
the
set, always perform
an
AC
leakage test
on
all exposed metallic
parts of
the
cabinet to
be
sure
the
set is safe
to operate
without
danger of electrical shock.
DO
NOT USE A LINE ISOLATION TRANS-
FORMER DURING THIS TEST. Use
an
AC
voltmeter
with
a 5000 ohms
per
volt
or
more
sensitivity
in
the
following manner: Connect
a 1500 ohm, 10-watt resistor (63-10401-76),
paralleled
by
a 0.15
JLF,
150
VAC
type
capacitor (22-4384), between a
known
good
A.
C.
VOLTMETER
~I
22-4384
•
151lF
A.C.TYPE
TO
GOOD
EARTH
GROUND
SUCH
AS
WATER
PIPE,
CONDUIT,
ETC.
63-10401-76
150011
10
WATT
Figure 1-1
IMPLOSION
PROTECTION
1.
All
Zenith
picture
tubes are
equipped
with
an
integral implosion protection system,
but
be
careful to avoid damage during installa-
tion. Avoid scratching
the
tube.
2.
Use only
Zenith
replacement tubes.
X-RADIATION
1.
Be sure procedures
and
instructions to all ser-
vice personnel cover
the
subject of X-radia-
tion.
The
only
potential source of X-rays
in
the
current
Monitor is
the
picture tube. How-
ever,
this
tube
does
not
emit X-rays
when
the
2.
III
earth
ground
(water pipe, conduit, etc.)
and
the
exposed metallic parts,
one
at
a time. Mea-
sure
the
AC
voltage across the combination
1500
ohm
resistor
and
0.15
JLF
capacitor. Re-
verse
the
AC
plug
and
repeat
AC
voltage mea-
surements for
each
exposed metallic part.
Voltage measured
must
not
exceed 0.75 volts
rms. This corresponds
to
0.5 milliamps AC.
Any value exceeding this limit constitutes a
potential shock
hazard
and
must
be corrected
immmediately.
PLACE
TH
I S
PRO
BE
ON
EACH
EXPOSED
METALLIC PART.
HV
is
at
the
factory-specified level.
It
is only
when
the
HV
is excessive
that
X-radiation
can
be generated.
The
basic precaution
which
must be exercised is to keep
the
HV
at
the
factory-recommended level. Refer to
the
X-
Ray Precaution Label
which
is located
inside
each Monitor for
the
correct
high
voltage.
The
proper value is also given
in
the applicable
service manual. Operation
at
higher voltages
may cause a failure of
the
CRT
or
high voltage
supply
and,
under
certain circumstances,
may
produce radiation
in
excess of desirable
levels.
Use
only
Zenith
specified CRT
anode
connec-
tors.
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