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CDP-590
TABLE OF CONTENS
3.
Measuring the voltage drop across a resistor by
;
means of a VOM
or battery-operated AC volt-
Section
ale
rake
meter.
The
"limit"
indication
is 0.75 V, so
Specifications ----------1-e-1eeeeeeeeeeereecee
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analog
meters
must
have
an
accurate
low-
voltage
scale.
The
Simpson
250 and
Sanwa
cocvsesceccsseecncescsecceensecceenenreeeeseeeeeceeeescesnserer ees 4
SH-63Trd
are
examples
of a passive VOM
that
is suitable.
Nearly all battery operated
digital
2. IC FUNCTION DESCRIPTION ©-0700--e
ree 5
multimeters
that
have
a.2V
AC
range
are
OF BASE UNIT -rrerrrrrrreereeertereereereee 6
suitable.
(See Fig. A)
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To Exposed Metal
Be (DIAGRAMS wees ieiseescesdeoeaecstteendas
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PA
stat
5-1.
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11
5-2. Printed Wiring Boards strssrssssssererseeesseesssseeeeenes 12
AC
0.15
mw
voltmeter
7 eR
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6-3.
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23
6-4. MD Section-2(BU-SBDI) srvtietteiereeee 24
7. ELECTRICAL PARTS LIST --:cccccecccceeesstreeeestetssaeseers 25
=
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
SAFETY CHECK-OUT
SERVICING NOTE
After
correcting
the
original
service
problem,
NOTES
ON
HANDLING
THE
OPTICAL
PICK-
perform the following safety check
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.
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
LEAKAGE
TEST
matter which is included in the repair parts.
The flexible board is easily damaged
and should be
The AC leakage from any exposed metal part to
handled withicare
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
CAUTION
current
can
be
measured
by
any
one
of three
Use of controls or adjustments or performance
methods.
of procedures other than those specified herein
may result in hazardous radiation exposure.
1.
A
commercial
leakage
tester,
such
as
the
Simpson
229
or RCA
WT-540A.
Follow the
manufacturers'
instructions to use these instru-
NOTES
ON
LASER
DIODE
EMISSION
CHECK
ments.
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 check-
this job.
ing the laser diode emission, observe from more than 30
cm away from the objective lens.
2.
A battery-operated AC milliammeter.
The Data
Precision 245 digital multimeter is suitable for
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