Technics SL-BD21 - Schematic Diagram; Circuit Board and Wiring Connection Diagram

@ SCHEMATIC DIAGRAM
DI~4
SVDISR35200
RECTIFIER
c3 G022 c20022
For United Kingdom
and Australia:
240V AC, 50 Hz
For continental
Europe: 220V AC, 50 Hz
@ CIRCUIT BOARD AND WIRING CONNECTION DIAGRAM
TURNTABLE
ORIVE MOTOR
Notes:
1.81 Power switch in “on” position.
2.
S101:
Speed
selector
switch
in
“33”
position.
3.
The
values
are
of
the
reference
voltage
for
the
turntable
rotation
(33
rpm)
of
this
unit,
measured
by
a
DC
voltmeter
(high
impedance)
on
the
basis
of
chassis.
So,
some
error
might
be
included
depending
on
the
internal
impedance
of
the
measuring
instrument
and
the
unit
measured.
4:
):
voltage
in
45
rpm.
4. Important safety notice:
Components
identified
by
a
A\
mark
have
special
characteristics
important
for safety.
When
replacing
any of these
components,
use only
manufacturer's
specified
parts.
5.
VR101
is
the
33-1/3
rpm
speed
adjustment
variable
resistor.
6. VR102 is the 45 rpm speed adjustment variable resistor.
7. This schematic diagram may bemodified at any time with the development
of new technology.
*
The
part
No.
of
transistors,
IC
and
diodes
mentioned
in
the
schematic
diagram
stand
for
production
part
No.
Regarding
the
part
No.
with
©
mark,
the
production
part
No.
are
different
from
the
replacement
part
No.
Therefore,
when
placing
an
order
for
replacement
part,
please
use
the
part
No.
in
the
replacement
part
list.
© Block diagram
Power
transformer Rectifier
eal
Geences
-13—
Oc SERVO
OUTPUT
Caution!
IC
and
LSI
are
sensitive
to
static
electricity.
Secondary
trouble
can
be
prevented
by
taking
care
during
repair.
©
Cover
the
parts
boxes
made
of
plastics
with
aluminum
foil.
©
Ground
the
soldering
iron.
©
Puta
conductive
mat
on
the
work
table.
*
Do
not
touch
the
legs
of
IC
or
LSI
with
the
fingers
directly.
@ Power source circuit
START/STOP
La" AC “Socket
Product for Southeast Asia, Oceania, Africa,
Middle Near East and Central South America.
([XA] area)
Note: S2: Voltage selector in “220 ~ 240V” position.
Df
“110-1201 220-2009
507 cone
AC Socket
2
FC FCI
-14-—
SPEED
Turntable
drive motor
©
Terminal
guide
of
IC
and
diodes
SVD181555
k—fS}—«
K ~~ '--— A