Sony ST-JX311 Manuale di servizio - Pagina 2
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ST-JX311/JX411
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
(SOO
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 0.75V,
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
0.15 pF
15k
voltmeter
(0.75 V)
=
Earth Ground
Fig. A.
Using an AC voltmeter to check AC leakage.
SAFETY-RELATED
COMPONENT
WARNING!!
COMPONENTS
IDENTIFIED
BY MARK
A OR
DOTTED
LINE WITH MARK
A 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.
TABLE
OF CONTENTS
Section
Title
Page
Specifications
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a
l
Safety
Check-out
Cem
meer
eer
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sre
swerve
sresseove
2
SECTION
1. GENERAL
1-1. Location of Controls ---+--+++++ree reese 3
1-2.
Connections
rs
4
SECTION 2. ELECTRICAL
ADJUSTMENTS
:----
6
SECTION 3. DIAGRAMS
3-1.
Printed Wiring Boards
----+---+--++++-++--
7
3-2. Schemartic Diagram
(Tuner Section) ------
11
3-3.
Semiconductor
Lead Layouts
------------>
13
3-4.
Waveforms
ee
cr
as
13
3-5.
Schematic Diagram
(Control and Power Section) -----------
14
SECTION 4. EXPLODED
VIEW
....------------
17
SECTION 5. ELECTRICAL
PARTS
LIST
------
19
To change the AM tuning interval
The AM tuning interval is preset at the factory to 10 kHz
to match the frequency allocation system of your
country. To change the interval to 9 kHz, proceed as
follows.
1 Depress the POWER switch to turn on the unit.
2 Set the BAND FM/AM selector to AM.
3 Press the POWER switch to turn off the unit.
4 Hold the TUNING knob in the "+" position, and
depress the POWER switch to turn on the unit.
To reset the interval to 10 kHz, follow the same
procedure.
Note
When the interval is changed, all preset stations which
you have memorized using the numeric buttons will be
erased from the memory. After changing the interval, be
sure to preset the stations again.
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.
—)—