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Sharp RP-107H - PHONO MOTOR CONTROL CIRCUIT; INDICATOR DRIVE CIRCUIT

Sharp RP-107H
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®@
In
the
case
of
side
B
playing:
There
are
produced
a
low
level
signal
at
pin
(1)
of
the
microcomputer
and
a
high
level
signal
at
its
pin
6)
,
so
that
the
switches
SW3
and
SW1
turn
on,
and
the
switches
SW2
and
SW4
turn
off,
which
is
reverse
to
that
in
the
case
of
side
A
playing.
Therefore,
the
cartridge
for
the
side
B
is
allowed
to
operate
and
that
for
the
side
A
is
stopped.
PHONO
MOTOR
CONTROL
CIRCUIT
This
circuit
consists
of
Q201
to
204
and
1C203,
and
provides
a
proper
control
of
the
phono
motor.
1.
Speed
(33/45
r.p.m.}
Selection
When
_the
speed
is
set
at
33
r.p.m.,
the
output
signal
from
pin
20
of
the
microcomputer
becomes
high
level
to
turn
on
Q201,
thus
the
phono
motor
revolving
at
the
speed
of
33
r.p.m.
When
the
speed
is
set
45
r.p.m.,
the
output
signal
from
pin
of
the
microcomputer
becomes
low
level
to
turn
off
Q201,
thus
the
phono
motor
revolving
at
the
speed
of
45
r.p.m.
The
speed
is
adjustable
with
VR201
(for
45
r.p.m.)
and
VR202
(for
33
r.p.m.).
2.
Normal/Reverse
Rotation
Selection
@
Normal
rotation
(with
side
B
playing)
When
the
side
B
is
played,
there
are
produced
high
level
signal
and
low
level
signal
respectively
at
pins
@))
and
@2
of
the
microcomputer,
and
these
are
changed
in
level
by
Q202
and
_0203
to
be
applied
to
1C203.
Therefore,
pin
(1)
and
pin
(2)
of
th
phono
motor
are
given
negative
voltage
and
positive
voltage
respectively,
so
that
the
phono
motor
revolves
in
normal
direction.
@
Reverse
rotation
(with
side
A
playing):
When
the
side
A
is
played,
there
are
produced
high
level
signal
and
low
level
signal
respectively
at
pin
and
pin
@)
of
the
microcomputer,
and
these
are
changed
in
level
by
Q202
and
Q203
to
be
applied
to
1C203.
Therefore,
pin(1)
and
(2)
of
the
phono
motor
are
given
positive
voltage
and
negative
voltage
respectively,
so
that
the
phono
motor
revolves
in
reverse
direction.
INDICATOR
DRIVE
CIRCUIT
@
Indicator
section:
This
circuit
is
made
up
of
1C206,
Q209
and
Q210.
When
any
of
the
side
A/B
selector
key,
both
sides
play
key
and
repeat
key
is
pushed,
the
output
signal
from
the
micro-
computer
becomes
low
level
to
be
applied
to
the
indicator
drive
circuit,
which
then
lights
up
the
indicator
correspond-
ing
to
one
of
those
keys
which
has
been
pushed:
@
APMS
indicator
section:
The
APMS
indicator
circuit
consists
of
1C301.
When
the
APMS
key
is
pushed,
the
microcomputer
produces
serial-
data
signal
to
be
applied
to
1C301,
which
then
causes
the
APMS
indicator
to
light
up
to
show
how
many
programs
have
been
preset
by
the
APMS
function.
C0
CD
Cry
CCC)
ae,
=
open
Ly
Socket,
C
=,
—_I
a
:
soms
a
Figure
34-5
M203
FHONO
MOTOR
PHONO
MOTOR
M54546P
Vee_Vec'_O2
Lr
cnr
203
'[OOQOOO
10.3V
GND
PHONO
MOTOR
ROTATION
Figure
34-1
:
Output
[
Rolle
level
1C203
Phono
motor
change
operation
Output
Q202]
0203
Input
Output
Pin
|
Pin
Pin]
Pin|
Pin
|
Pin
In
reverse
ro-
tation
(with
L
H
Off
|
On
H
L
H
L
side
A
played)
In
normal
ro-
tation
(with
H
L
On
|
Off
L
H
L
H
sida
A
played)
t
|
Stop
L
be
| Off
|
Off
H
H
E
L
Table
31-1
Phono
Motor
Control
Circuit
Table
34-2
Side
B
Indicator
>
PL
302
Side
A
Indicator
GND
ry
From
Microcomputer
Pin
Figure
34-3
LED308~LED3I4.
GL
3HD7
From
Microcomputer
R308
~
R314
560
Pin
>
R3I4
RZ3
RZ
RWi
RO
R39
RIS
RIO
i
ae
From
ome
OM
OV
OV OV
_oOV_oV_
ov
ov
_ov_w
Microcomputer
8
Pin,
J
Pin>+—
+10V
Figure
34-4
APMS
34

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