Sony SSM-930 Service Manual page 3
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Also See for SSM-930:
- Operating instructions manual (11 pages) ,
- Catalog (46 pages) ,
- Operating instructions manual (10 pages)
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SSM- 930 only
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 ex-
posed metal part having a return to chassis, must not
exceed
0.5 mA
(500 microampers).
Leakage current
can be measured by any one of three methods.
1.
A
commercial
leakage
tester,
such
as
the
Simpson
229
or RCA
WT-540A.
Follow
the
manufacturers' instructions to use these instru-
ments.
_2.
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 0.75V, 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 2V
AC
range
are
suitable.
(See Fig. A)
To Exposed Metal
Parts on Set
AC
voltmeter
(0.75V)
=
Earth Ground
Using an AC voltmeter to check AC leakage.
| SSM - 930/930CE
SSM - 930 only
X-RAY
RADIATION
WARNING
Be sure that parts replacement in the high voltage block and
adjustments made to the high voltage circuits are carried out
precisely
in accordance
with
the
procedures
given
in this
manual.
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