CDP-970
SAFETY
CHECK-OUT
After
correcting
the original
service problem,
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.
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
0.5 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 0.75 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 2
V
AC range
are
suitable.
(See
Fig.
A)
To Exposed Meta!
Parts or) Set
AC
voltmeter
(0.75
VI
—
Earth Ground
Fig,
A. Using an AC
voltmeter
to
check
AC leakage.
0. 15iiF
r
I
I.SkQ,
PROTECTION
OF EYES
FROM LASER
BEAM DURING
SERVICING
This set employs a
laser. Therefore, be sure to
fol-
low carefully
the instructions
below when
servicing.
CAUTION
Use
of controls
or adjustments
or
performance
of
procedures other
than those
specified
herein
may result
in hazardous
radiation
exposure.
NOTES ON HANDLING
THE OPTICAL PICK-
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.
1
.
Laser
Diode
Properties
•
Material:
GaAIAs
•
Wavelength: 780 nm
•
Emission Duration:
continuous
•
Laser
Output:
max. 44.6
pW*
*
This output is the value measured at a distance
of
about 200 mm
from
the
objective
lens surface
on
the
Optical
Pick-up Block.
2. During
service, do not take the Optical
Pick-up
Block apart, and do not
adjust the APC
circuit.
If there
is a
breakdown in the APC circuit
(includ-
ing laser diode), replace the entire Opticcal
Pick-
up
Block
(including
APC
borad).
VAROITUS:
Laite sisaltaa,
laserdiodin, joka
lahettaa
(nakymatbnta)
silinille vaarallista lasersateilya.
BESKYTTELSE AF 0JNE
MOD LASERSTRALING
UNDER
SERVICE
1. Laser-didoe data
•
Matehale: GaAIAs
•
Udstraling:
Kontinuerlig
•
Belgelaengde:
780
nm
•
Laseroutput:
Max.
0,4
mW*
*
Malt
i
1,6
mm afstand
fra
overfladen
af
objektiv-
linsen
pa den
optiske
pick-up enhed.
•
Klassifikation: Klasse
Illb.
I dette apparai
anvendes
laserlys.
Derfor skal
nedensiaende insiruktioner n 0je
f
0lges under
service.
p
0
lg i 0vrigi
insirukiionerne i
servicemanualen.
ADVAR5EU!
Under
service mft
ojnene ikke
komme
naer
objektiv-linsen
pd den
optiske pick*up
enhed.
I tilfaelde af at det er
nedvendigt
at
kontrollere
udsendelsen af
laserlys. skal
det ske
i en
afstand af mere
end 25 cm
fra den optiske
pick-up.
LASER ADVARSEL M/ERKNING
Falgende
macrkning findes
indvendig i
apparatet:
1.
Advarsel Macrkning
2. Adskil aldrig
den optiske
pick-up enhed
under
service, ogjuster
ikke
APC kredslebet
(Au
tomatic
Power Control).
Hvis
APC kredslobet (inch
laser-
dioden) bryder
ned, skal hele
den optiske
pick-up
enhed
(inch APC
printkortet)
udskiftes.
SAFETY-RELATED
COMPONENT
WARNIN«I!
COMPONENTS
IDENTIFIED
BY MARK
^
OR
[JOTTED
LINE
WITH MARK
^
ON THE SCHEMATIC
DIA^jRAMS
AND IN THE PARTS
LIST
ARE CRITICAL XO
SAFE
OPERATION.
REPLACE
THESE COMPONENTS
WITH
SONY PARTS WHOSE
PART
NUMBERS
APh^AR
AS
SHOWN IN THIS
MANUAL
OR IN
SUPPLEMEU-TS
PUB-
LISHED BY SONY.
—
2
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