SAFETY
PRECAUTIONS
C
1.
Before
returning
an
instrument
to
the
customer,
always
make
a
safety
check
of
the
entire
instrument,
including,
but
not
iimited
to,
the
following
items:
AC
Leakage
Test
(READING
SHOULD
NOT
BE
ABOVE
0.5
mA)
LEAKAGE
CURRENT
JESTER
.
DEVICE
UNDER
TEST
a.
Be
sure
that
no
built-in
protective
devices
are
de
fective
and/or
have
been
defeated
during
servicing.
(1)
Protective
shieids
are
provided
on
this
chassis
to
protect
both
the
technician
and
the
customer.
Correctly
replace
all
missing
protective
shieids,
including
any
removed
for
servicing
convenience.
(2)
When
reinstalling
the
chassis
and/or
other
as
sembly
in
the
cabinet,
be
sure
to
put
back
in
place
all
protective
devices,
including
but
not
limited
to,
nonmetallic
control
knobs,
insulating
fishpapers,
adjustment
and
compartment
covers/shields,
and
isolation
resistor/capacitor
networks
Do
not
oper
ate
this
instrument
or
permit
it
to
be
operated
without
aii
protective
devices
correctiy
instaiied
and
functioning.
}
1
+
TEST
ALL
EXPOSED
METAL
SURFACES
2-WIRE
CORD
0
ALSO
TEST
WITH
PLUG
REVERSED
(USING
AC
ADAPTER
PLUG
AS
REQUIRED)
3
1
EARTH
4-
GROUND
d.
X-Radlatlon
and
High-Voltage
Limits
-
Because
the
picture
tube
is
the
primary
potential
source
of
X-
radiation
in
solid-state
Equipment,
it
is
specially
constructed
to
prohibit
X-radiation
emissions.
For
continued
X-radiation
protection,
the
replacement
picture
tube
must
be
the
same
type
as
the
original.
Also,
because
the
picture
tube
shields
and
mount
ing
hardware
perform
an
X-radiation
protection
function,
they
must
be
correctly
in
place.
High
voltage
must
be
measured
each
time
servicing
is
performed
that
involves
B+,
horizontal
deflection
or
high
voltage.
Correct
operation
of
the
X-radiation
protection
circuits
also
must
be
reconfirmed
each
time
they
are
serviced.
(X-radiation
protection
cir
cuits
also
may
be
called
“Horizontal
disable”
or
“Hold-down.”)
Read
and
apply
the
high-voltage
limits
and,
if
the
chassis
is
so
equipped,
the
X-
radiation
protection
circuit
specifications
given
on
instrument
labels
and
In
the
Product
Safety
&
X-
radiation
Warning
note
on
the
service
data
chassis
schematic.
High
voltage
is
maintained
within
specified
limits
by
close-tolerance
safety-related
components/adjust
ments
In
the
high-voltage
circuit.
If
high
voltage
exceeds
specified
limits,
check
each
component
specified
on
the
chassis
schematic
and
take
cor
rective
action.
(Refer
to
“SERVICE
ADJUSTMENT”))
«
b.
Be
sure
that
there
are
no
cabinet
openings
through
which
an
adult
or
child
might
be
able
to
insert
their
fingers
and
contact
a
hazardous
voltage.
Such
openings
include,
but
are
limited
to,
(1)
spacing
between
the
picture
tube
and
the
cabinet
mask,
(2)
excessively
wide
cabinet
ventilation
slots,
and
(3)
an
improperly
fitted
and/or
incorrectly
secured
cabi
net
back
cover.
<
c.
Leakage
Current
Hot
Check
-
With
the
instrument
completely
reassembled,
plug
the
AC
line
cord
di
rectly
into
a
120V
AC
outlet.
(Do
not
use
an
isola
tion
transformer
during
this
test.)
Use
a
leakage
current
tester
or
a
metering
system
that
complies
with
American
National
Standards
Institute
(ANSI)
Cl01.1
Leakage
Current
for
Appliances
and
Under
writers
Laboratories
UL
1950
(5.2).
With
the
in
strument
AC
switch
first
in
the
ON
position
and
then
in
the
OFF
position,
measure
from
a
known
earth
ground
(metal
waterpipe,
conduit,
etc)
to
all
exposed
metal
parts
of
the
instrument
(antennas,
handle
bracket,
metal
cabinet,
screwheads,
metal
lic
overlays,
control
shafts,
etc.),
especially
any
exposed
metal
parts
that
offer
an
electrical
return
path
to
the
chassis.
Any
current
measured
must
not
exceed
3.5
milliamp.
Reverse
the
instrument
power
cord
plug
in
the
outlet
and
repeat
test.
ANY
MEASUREMENTS
NOT
WITHIN
THE
LIMITS
SPECIFIED
HEREIN
INDICATE
A
POTENTIAL
SHOCK
HAZARD
THAT
MUST
BE
ELIMI
NATED
BEFORE
RETURNING
THE
INSTRU
MENT
TO
THE
CUSTOMER.
«
2.
Read
and
comply
with
all
caution
and
safety-related
notes
on
or
inside
the
receiver
cabinet,
on
the
receiver
chassis,
or
on
the
picture
tube.
#
2
Summary of Contents for PG-2740
Page 41: ...I I f ...