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SAFETY
CHECK-OUT
After correcting the original service problem, perform
the following safety checks before releasing the set to
the customer:
Check
the
metal
trim,
''metallized"
knobs,
screws,
and all other exposed
metal parts for AC leakage.
Check leakage as described below.
LEAKAGE
TEST
The
AC
leakage
from
any exposed
metal
part to
earth
ground
and
from
all exposed
metal
parts
to any exposed metal part having a return to chas-
sis, must
not
exceed
3.5
mA.
Leakage
current
can be measured by any one of three methods.
!.
A
commercial
leakage
tester,
such
as
the
Simpson
229 or RCA
WT-540A.
Follow the
manufacturers'
instructions to use these instru-
ments.
A battery-operated AC milliammeter.
The Data
Precision
245
digital multimeter
is suitable for
this job.
3.
Measuring the voltage drop across a resistor by
means
of a VOM
or battery-operated
AC volt-
meter.
The
"limit" indication
is 5.25V,
so
analog
meters
must
have
an
accurate
low-
voltage
scale.
The
Simpson
250 and
Sanwa
SH-63Trd
are examples of a passive VOM that
is suitable.
Nearly all battery operated
digital
multimeters
that have
a 20V
AC
range are
suitable. (See Fig. A)
To Exposed Metal
Parts on Set
AC
vo/tmeter
P_] (5.25)
0.15 pF
—
Earth Ground
Using an AC voltmeter to check AC leakage.
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The material contained
in this manual consists of infor-
mation
that is the property of Sony Corporation and is
intended solely for use by the purchasers of the equip-
ment described in this manual.
sony Corporation expressly prohibits the duplication of
any portion of this manual or the use thereof for any pur-
pose other than the operation or maintenance
of the
equipment described in this manual without the express
written permission of Sony Corporation.
Le matériel contenu dans ce manuel consiste en infor-
mations
qui sont la propriété de Sony Corporation et
sont destinees exclusivement a !'usage des acquéreurs
de l'equipement décrit dans ce manuel.
sony Corporation interdit formellement la copie de quel-
que partie que ce soit de ce manuel Ou son emplo! pour
tout
autre
but que
des
opérations
ou
entretiens
de
equipement
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Corporation.
Das in dieser Anleitung enthaitene Material besteht aus
Informationen, die Eigentum der Sony Corporation sind,
und ausschlieBlich zum Gebrauch durch den Kaufer der
in
dieser
Anleitung
beschriebenen
Ausrustung
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