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MODEL IDENTIFICATION
—Model Number Label—
CDP-C235
CDP-C335
| SONY.
woonn.WZ7Z
COMPACT DISC PLAYER
WLLL
LLL
US, Canadian model:
AC:
120V 60Hz
UK, Australian model:
AC:
240V~50/60Hz
AEP model:
AC:
220-230V~50/60Hz
E model:
AC:
110-120V, 220-240V~50/60Hz
UP BLOCK
OR
BASE
UNIT
The
laser
diode in the optical pick-up
block may
suffer electrostatic breakdown because of the poten-
tial difference generated by the charged electrostatic
load, etc. on clothing and the human body.
During repair, pay attention
to electrostatic break-
down
and
also use
the procedure
in the printed
matter which is included in the repair parts.
The flexible board is easily damaged
and should be
handled with care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be
focused on the disc reflective surface by the objective lens in
the optical pick-up block. Therefore, when checking the laser
diode emission, observe from more than 30cm away from the
objective lens.
SAFETY
CHECK-OUT
After
correcting
the original
service
problem,
perform the following safety checks before releasing
the set to the customer:
Check
the antenna
terminals,
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 chassis, must
not
exceed
0.5mA
(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 0.75 V, 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
as
(0.75 V)}
=
Earth Ground
Using an AC voltmeter to check AC leakage.
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