Sansui SR-2020 - Operation

Fe
FR-3060
4-4, 4-5 and 4-6)
4-1.
OPERATION
OF
AUTO
MECHANISM
J.
At
the
condition
of
STOP,
the
micro
switch
(SW1)
and
the
start
switch
(Leaf
switch)
are
OFF,
on
the
other
hand
the
micro
switch
(SW2)
and
the
muting
switch
are
ON.
2,
When
the
auto
lever
is
placed
at
START
posi-
tion,
the
start
switch
becomes
ON
and
timing
6.
motor start’ running.
The
timing
motor
is
coupled
with
starting
cam
and
the
starting
cam
controls
the
micro
switch.
When
the
timing
motor
starts
running,
the
start-
ing
cam
starts
together
and
the
micro
switch
(SW1)
becomes
ON
from
OFF.
(Therefore, as for start switch, the switch is
tured ON temporarily. )
Simultaneously
with
it,
the
motor
will
start
operating.
3.
As
the
starting
plate
and
starting
cam
are
coupled
with
crank
lever,
the
starting
plate
will
be
oper-
ated
while
the
timing
motor
is
being
operated.
As
for
the
operation
of
the
starting
plate
and
starting
cam,
as
the
diameter
of
starting
plate
is
larger
as
compared
with
that
of
starting
cam,
the
starting
plale
turns
up
to
a
certain
angle
and
then
turnes
reversely
by
the
same
angle
while
the
starting
cam
turns
in
one
revolution.
4.
When
the
timing
motor,
starting
cam
and
start-
ing
plate
are
operated,
the
START/RETURN
plate
located
at
tip
end
of
the
starting
plate
will
push
the
PU
plate
located
at
the
lower
part
of
the
tone
arm
and
it
will
keep
pushing
the
tone
arm
until
it
reaches
to
the
position
of
the
lead-
in
groove
of
disk.
When
it
comes
to
this
position,
the
select
arm
8.
(B)
(See
Fig.
3-3)
will
serve
as
stopper
and
the
START/RETURN
plate
which
pushes
PU
plate
so
far
will
be
turned
over
and
it
does
not
push
the
PU
plate
anymore.
Then, it is al AUTO-IN position.
5.
When
the
tone
arm
comes
to
the
AUTO-IN
position,
the
starting
cam
will
have
turned
in
7-4
e
half revolution.
The
micro
switch
(SW2)
which
is
so
far
ON
will
be
turned
OFF,
and
the
timing
motor
will
stop.
Simultaneously
with
it,
the
muting
switch
is
turned
OFF
(cartridge
at
open
condition)
from
ON
(cartridge
at
shortcircuiting
condition),
and
performance
starts
as
the
result.
In
performance,
the
micro
switch
(SW2)
is
OFF,
micro
switch
(SW1)
is
ON
and
muting
switch
is
OFF.
When
performance
proceeds
and
the
tone
arm
traces
up
to
the
lead-out
groove,
the
mag-
net
located
at
tip
end
of
PU
plate
comes
at
side
of
reed
switch
and
turns
on
this
reed
switch.
When
the
reed
switch
is
turned
ON,
the
timing
motor
will
start
running
and
the
micro
switch
(SW2)
will
be
turned
ON.
When
the
timing
motor
starts
operation
once
again,
the
starting
cam
will
start
next
half
revo-
lution.
Then,
the
starting
plate
revolves
contrary
to
that
at
the
time
of
AUTO-IN.
And,
the
START)
RETURN
plate
pushes
the
PU
plate
from
the
reverse
direction
and
makes
tone
arm
return.
However,
when
it
comes
to
the
position
of
arm
rest,
the
tone
arm
is
stopped
by
the
stopper
located
on
the
arm
base
and
the
START/RE-
TURN
plate
is
turned
over
and
the
tone
arm
will
land
on
the
arm
rest.
Thus,
the
starting
cam
will
have
turned
in
one
revolution
and
the
micro
switch
(SW1)
will
be
turned
OFF.
Thus,
the
motor
and
timing
motor
will
stop
their
operation
and
they
will
return
to
the
origi-
nal
stop
condition.
When the auto lever is placed at position of
REPEAT, the timing motor starts again because
the start switch is ON even if the performance
finished
and
the
micro
switch
(SW1)
becomes
OFF.
Accordingly, as the micro switch (SW1i) which
is turned OFF is turned ON, REPEAT perform-
ance wil] be made.
pie ea:
4.
OPERATION
OF
MECHANISM
(See
Fig.
4-1,
4-2,
4