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CFD-50
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
0.5mA
(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
(0.75 V)
Earth Ground
Using an AC voltmeter to check AC leakage.
TABLE
OF CONTENTS
Notes on Handling the Optical Pickup
Block
or
Base
Unit
a
3
Notes on Laser Diode Emission Check
-----+-
3
Chuck Plate Jig on Repairing
--+++++++++eee-
a
Laser Diode and Focus Search
Operation
Check
a
3
2.
GENERAL.
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4
3.
DISASSEMBLY
..----.-----eecceeecceees
4
4.
MECHANICAL
ADJUSTMENTS
Tape Recorder Section
-++++eeeeeeeeeeeeeee
6
5.
ELECTRICAL
ADJUSTMENTS
5-1.
Tape Recorder Section
--+++++err essere sees
7
5-2.
Tuner
Section
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8
5-3.
CD
Section
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0: Sah ec Oe
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wae
9
6.
DIAGRAMS
6-1.
CD Section Block Diagram
-+++++++++++-+-+--
13
6-2.
Tuner, Audio Section Block Diagram
-+---++:-
1S
6-3.
Printed Wiring Boards
---+++-++++eee
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6-4.
Tuner, Audio Section Schematic Diagram
2)
6-S.
CD Section Schematic Diagram
-++++++++++-
25
7.
EXPLODED
VIEWS
.«.---------eseeeeeee
29
8.
ELECTRICAL
PARTS
LIST
.-----------
35
SAFETY-RELATED
COMPONENT
WARNING!!
COMPONENTS
IDENTIFIED BY MARK A\ 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.
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.
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