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Sharp RP-107H - PHONO MOTOR ROTATIONAL SPEED ADJUSTMENT; APSS SENSOR SENSITIVITY ADJUSTMENT

Sharp RP-107H
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RP-107H/117H
©
TRACKING
ERROR
DETECTOR/CARTRIDGE
FORWARD
CIRCUIT
The
description
here
is
written
for
side
A
playing
alone.
This
circuit
is
Composed
of
photo
interrupters
P!101
(for
side
A),
P1102
(for
side
B),
1C103
and
1C104,
and
controls
the
car-
tridge
forward
operation
when
a
record
is
playing.
As
playing
the
side
A
of
a
record
proceeds,
the
tonearm
becomes
more
inclined
the
angle
of
which
is
detected
by
P1101
(now
there
is
a
light
emission
to
P1101),
and
the
resultant
signal
(at
high
level)
is
applied
to
pin
(2)
of
1C104
to
drive
the
cartridge
motor
to
allow
a
forward
motion
of
the
tonearm.
And
as
a
result
of
forward
rotation
of
the
cartridge
motor,
when
the
tonearm
advances
to
reach
the
place
where
its
inclination
is
zero,
a
light
emission
to
P1101
is
stopped
so
that
the
output
signal
from
P1101
becomes
low
level
to
turn
off
1C104
and
causes
the
cartridge
motor
to
stop.
This
is
repeated
as
far
as
the
record
playing
continues,
and
the
same
operation
occurs
for
side
B
playing
too.
If
there
is
something
accidental
to
make
slantwise
the
cartridge
to
cause
its
erroneous
angle,
there
is
caused
a
high
level
signal
at
pin
(for
side
A)
and/or
pin
(for
side
B)
of
the
microcom-
puter
so
that
the
tracking
error
output
is
grounded
to
stop
the
cartridge
forward
motion.
TONEARM
POSITION
DETECTOR
CIRCUIT
This
circuit
is
made
up
of
photointerrupter
P!103
and
gear
drum.
Detected
by
these,
the
output
pulse
is
applied
to
1C204
(comparator)
where
it
is
shaped
in
waveform,
and
then
is
supplied
to
pin
of
the
microcomputer.
In
the
microcomputer,
there
is
a
pulse
checking
function
with
which
it is
detected
how
far
from
the
rest
position
the
tone-
arm
is
now
being
situated.
The
microcomputer
has
the
control
addresses
assigned
as
follows:
1.
Rest
position:
0
2.
Lead-in
addresses
30cm
LP
record:
1
25cm
record:
58
17cm
EP
record:
147
3.
Lead-out
addresses
30cm/25cm
record:
219
17cm
EP
record:
225
4.
Lead-in
area
address
30cm
LP
record:
0
25cm
record:
48
to
68
17cm
EP
record:
137
to
157
@
These
addresses
are
used
when
the
record
size
is
to
be
detected.
SIDE
A/SIDE
B
CARTRIDGE
SIGNAL
SELECTOR
CIR-
CUIT
This
circuit
consists
of
1C102 which
selects
the
cartridge
for
the
side
A
or
side
B
of
a
record
to
be
ready
to
move
for
playing.
@
In
the
case
of
side
A
playing:
A
low
level
signal
is
caused
at
pin
of
the
microcomput-
er
while
a
high
level
signal
is
caused
at
its
pin
(1)to
turn
on
the
switches
SW2
and
SW4
of
IC102,
thereby
to
allow
the
cartridge
for
the
side
A
to
get
in
action.
At
the
time,
the
switches
SW3
and
SW1
of
1C102
are
turned
off
not
to
allow
the
cartridge
for
the
side
B
to
operate.
From
Microcomputer
@
Pin
(©)
Pin
From
Microcomputer
(G)
Pin
a?
Pin
From
Side
AorB
Photointer-
>
+
rupters
@
~
@>:
cnsin
GND
CARTRIDGE
MOTOR
ROTATION
+10.3V
GND
CARTRIDGE
MOTOR
CONTROL
MIO3
npiiz
CARTRIDGE
MOTOR
Figure
32-1
MICROCOMPUTER
@Pin
@Pin
aa
GND
+5V
From
Photo-interrupter
P1103
<
From
Photo-interrupter
P1103
Figure
32-2
From
Cartridge
4.
+
%
Side
A
$5
Side
B
L-ch
L-ch
From
Cartridge
Side
A
R-ch
Signal
GND
-4
From
Cartridge
Side
B
Output
R-ch
Signal
R-ch<
L-ch«
a
Microcomputer
Microcomputer
C1)
Pin
61)
Pin
Figure
32-3
99:

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