Sony CDP-791 - SAFETY CHECK-OUT; Leakage Test Procedure; Safety Component Warning

CDP-791/X1
1
1
ES
MODEL
IDENTIFICATION
—Model Number
Label
—
CDP-791
CDP-X111ES
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.
Canadian
Model:
AEP
Model:
UK Model:
AC: 120V
60 Hzl2W
AC220
-
230V,
50/60Hz
AC240V-50/
60Hz
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
Meta!
Parts
on Set
0.
15pF
-p
>1.5kil
.Z.
AC
voltmeter
(0.75
V)
Earth
Ground
|
Fig-
A. Using
an
AC
voltmeter
to check
AC
leakage.
TABLE OF
CONTENTS
Section
Title
Page
Specifications
1
Safety
Check-out
2
Model Identification
2
1.
GENERAL
Notes
on
Handling
the
Optical
Pick-up
Block
or
Base Unit
3
Notes
on Laser Diode
Emission
Check
3
Location
of
Controls
3
Adjusting
Operating
Voltage
3
2.
DISASSEMBLY
4
3.
ELECTRICAL BLOCK
CHECKING
S
Curve
Check
5
RF
Level
Check
5
E-F
Balance
Check
5
RF
PLL
Free-
run
Frequency
Check
6
Focus/Tracking
Gain 6
4.
DIAGRAMS
IC101(CXA1372Q)P1N
DESCRIPTIONS
••••
7
4-1.
Block
Diagram
8
4-2.
Printed
Wiring
Boards
12
4-3.
Schematic
Diagram
15
5.
EXPLODED
VIEWS
21
SAFETY-RELATED
COMPONENT
WARNING!!
COMPONENTS
IDENTIFIED
BY
MARK
OR
DOTTED
LINE
WITH MARK
^
ON
THE
SCHEMATIC DIAGRAMS
AND
IN THE
PARTS
LIST
ARE
CRITICAL
TO SAFE
OPERATION.
REPLACE
THESE
COMPONENTS
WITH
SONY
PARTS
WHOSE
PART
NUMBERS
APPEAR
AS
SHOWN
IN
THIS
MANUAL
OR IN
SUPPLEMENTS
PUB-
LISHED
BY
SONY.
6.
ELECTRICAL
PARTS
LIST
24
ATTENTION
AU COMPOSANT
AYANT RAPPORT
A
LA
SECURITE!
LES
COMPOSANTS IDENTIFIES
PAR
UNE
MARQUE
^
SUR LES DIAGRAMMES
SCHEMATIQUES
ET
LA LISTE
DES PIECES SONT
CRITIQUES
POUR LA
SECURITE
DE FONCTIONNEMENT.
NE
REMPLACER
CES COM-
POSANTS
QUE
PAR
DES
PIECES SONY
DONT
LES
NUMEROS
SONT
DONNES
DANS CE
MANUEL
OU
DANS LES
SUPPLEMENTS
PUBLIES PAR SONY.