TA-
AV411
:
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
Section
Title
Page
SPECIFICATIONS
Cee
emer acer
esr
ee
nesensecreserereeesuees
1
1.
GENERAL
eee
eee
ee
Re
ie
ee
a
ee
ee
3
2.
DIAGRAMS
2-1.
Description
on
IC101(
¢PD75206-717-3BE)
-::--
6
2-2.
Key
operation
i
ee
er
8
2-3.
MATRIX
for
FL
tube
and
KEY
IN-:::--+::::
12
2-4.
Description
on
IC303
(LV1001M)----++++++++:
14
2-5.
Circuit
Boards
Location
«+++
+sseseer
ee
eeeeees
16
2-6.
Semiconductor
Lead
Layouts::+++++ereseeeeees
17
2-7.
Printed
Wiring
BoardsS:sceercersceceescvcsevcee
18
2-8.
Schematic
Diagram
err
ee
er
ee
eee
ee
ee
ee
ee
23
2-9.
IC
Block
Diagrams
Cece
ease
cnensesneseencanseces
26
3.
EXPLODED
VIEWS
3-1.
Overall
Section
Lessserseseeceeccescresceceeecs
27
3+
2.
Overall
“Section
2
se1etserieritse
des
pastes
re
28
6.
ELECTRICAL
PARTS
LIST
--+-+++eesseeereeeeeees
29
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.
