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Sharp RP-107H - Page 26

Sharp RP-107H
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RP-107H/117H
©
AUDIO
SIGNAL
DETECTOR
CIRCUIT
When
the
unit
is
in
APSS
or
APMS
operation,
this
circuit
detects
the
beginning
or
the
end
of
the
program
of
a
record
being
played,
thereby
to
ensure
a
proper
control
of
the
mut-
ing.
When
the
side
A,
for
example,
is
now
being
played
and
the
beginning
or
the
end
of
the
program
is
reached,
the
output
signal
from
the
cartridge
motor
is
applied
to
pin
of
1C101
(operational
amplifier)
where
it
is
amplified,
and
is
sent
to
the
halfwave
voltage
douler
rectifier
composed
of
D105,
D106,
C112
and
C113,
then
arriving
at
pin
(2)
of
1C101.
Finally,
a
high
level
signal
goes
out
of
[C101,
and
is
applied
to
pin
(3)
of
the
microcomputer
so
that
the
microcomputer
can
tell
that
the
unit
has
reached
the
beginning
or
the
end
of
a
certain
program
of
the
record
being
played.
PROGRAM
SPACE
DETECTOR
CIRCUIT
This
circuit
is
made
up
of
a
side
A
sensor
(PT101,
LED106),
side
B
sensor
(PT102,
LED102)
and
1C205.
Now
let's
consider
the
case
where
the
unit
is
in
APSS
opera-
tion
for
side
A.
Then
the
infrared
ray
emitting
diode
(LED106)
and
phototransistor
(PT101)
work
together
to
differentiate
a
program
space
of
the
record
being
played
from
its
programs
recorded
part
by
sensing
difference
in
terms
of
infrared
reflectivity
between
these
two
parts.
That
is,
when
the
APSS
sensor
detects
a
program
space
of
the
record,
there
appears
a
signal
at
the
emitter
of
PT101
of
which
the
waveform
is
as
shown
in
of
Fig.
36-2.
This
signal
is
applied
to
1C205
where
it
is
amplified,
and
arrives
at
pin
of
1C204.
To
the
same
pin
of
!C204
is
also
applied
a
com-
Parison
signal
which
has
been
attenuated
by
the
attenuator
made
up
of
R268,
R270
andR271.
Besides,
to
pin
is
applied
a
reference
signal
of
which
the
waveform
is
made
gentle
by
R269,
R273
and
C224.
Finally
there
is
caused
a
high
level
pulse
(0)
at
pin
3)
of
1C204
which
results
from
comparison
between
the
comparison
signal
and
reference
signal,
and
is
fed
to
pin
of
the
micro-
computer,
which
causes
the
microcomputer
to
find
out
that
the
APSS
sensor
has
been
sensing
the
record’s
program
space.
SYNCRO
RECORDING
CONTROL
CIRCUIT
(RP-107H
only)
When
the
player
RP-107H
is
connected
to
the
amplifier
SA-107H
and
cassette
deck
RT-107H,
it
becomes
possible
to
perform
synchro
recording
between
the
player
and
cassette
deck.
To
start
the
synchro
recording
operation:
First
of
all
set
the
synchro
switch
of
the
player
RP-107H
to
“on”
position
while
keeping
the
cassette
deck
RT-107H
in
record/pause
mode.
And
when
the
play/cut
key
of
the
player
is
pushed,
the
tonearm
moves
down
to
the
record
surface
and
the
muting
is
released
to
allow
the
player
to
start
operating.
With
the
player
turned
on,
there
appears
a
low
level
pulse
(200
msec)
at
pin
of
the
microcomputer
to
turn
off_Q208
so
that
a
high
level
pulse
(200m
sec)
goes
out
of
pin
(6
)of
DIN
socket.
With
this
pulse
given,
the
cassette
deck
leaves
record/-
pause
mode
and
instead
goes
into
record
mode,
and
recording
will
begin
in
the
deck.
to
Microcomputer
|
@
Pin
APSS
Muting
Detector
Signal
Input
From
&GnbD
+5V
Cartridge
7
re
36-1
eck
Figure
36
Output
Signal
Vv
Input
Signal
ov
to
Pin
of
1C101
—*
Time
Vv
Input
Signal
to
Pin
40
oY
of
1C101
—Time
Vv
Input
Signal
|
/
ov
//A+High
Level
to
Pin
of
1C101
—~Time
Figure
36-2
APSS
SENSOR
SENSITIVITY
SWITCH
a
From
Side
A
APSS
Sensor
PT101
Fig.
36-3
Program
Space
Detector
Circuit
@)
Output
signal
from
the
emitter
of
the
Photo-transistor
(PT101)
a
i
oe
vw
AW
©)
Reference
Signal
Output
Signal
from
Pin
‘E)
of
1C204
Comparison
Signal
eae
kan
ea
(D)
ov
Figure
36-3
Input
Signal
to
1C204
=36=

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