Pioneer RT-1011L Service Manual page 9

3.5
PAUSE
ClRcUlT
(Fig.
12)
When
the
PAUSE switch (S6) is turned ON in
ihe PLAY and
REC modes, the
base
of
Q604 is
biased
via R608
- D612 -
56
-
512-7
-
S11-2
-
S10-2
to
switch Q604 ON,
causing RLG01
to
operate.
Because
of
this, the contact of RL601
is
closed
to
operate
RL603. This
also
makes
solenoids
SL1, SL2 and SLg
non-operative.
Further, RL602
restored and, through
its
contacts (RL602-1, RL602-2), shuts
off
the
power to
T.M
and S.M stopping these motors.
When
the
PAUSE
switch
is
turned OFF,
the
bias
to
Q604
is cut off
and relay
RL601
restores.
Its
contact
is
opened.
But
RL603
remains operative
until
C620 completes
dis-
charging,
improving the take-up torque
at
the
beginning
of
tape transport.
Reduction of waiting time
lag
by
use
of
PAUSE
switch. When
the
Fast Forward
or
Rewind
modes
continue
for
more than 6
seconds,
CG19
is
charged.
The deck
needs
6
-
7
seconds to
start playing when the PLAY button
is pressed.
This time lag can be
shortened using
the
PAUSE switch.
1.
QGOa
is ON
in the F.F.
and REW
modes.
2.
The
base
of
Q603
is
connected
to
the
collector
of
Q604 via R610.
When
Q604 is
ON, Q603
is
OFF.
3. C619
is charged via R604(C618) -
C61g -
R606
-
D606
-
S11-2
-
510-2.
4. When
the PLAY button is
pressed, C619
stops
charging and
discharges
via
C619 -
D605 -
R611
-
Q604
- R607
to
produce
Q604's
base bias
current,
keeping
Q604
ON
for
serveral seconds.
5. When the
PAUSE switch is ON, Q603
is
forward
biased
to
ON via R609 ry
SG
-
S12-1
-
S1L-2
-
S10-2 and, C619
is
rapidly
discharged through the loop C619 -
D605
-
R605 -
Q603.
FIT-1 01 1L
6.
When
the
PAUSE switch is OFF, the
bias
loop R608
-
D612
-
56
-
512-1"
-
S17_-I
-
S10-2
is cut
off to
turn
QG04
OFF.
This
restores
RL601 and
operates RL602,
start-
ing tape transport.
3.6
FUNCTION BUTTONS RELEASE
clRcUlT
(Fig.
13)
When
the tape
has
shut-off switch (S1b)
goes
'OFF', and
solenoid SL601 operates to
release
the function button.
1. S15 goes ON
when
the
tape
is
properly
loaded, and
feeds
the AC
supply
to
the
circuit.
2. The
base
of
Q601
is subject
to
reverse
bias
via D603 and
Q601 is thus OFF, C61?
is
also charged
via D604.
3.
When
the tape
has been
fully
taken up
and
S15 goes OFF,
no
negative voltage from
D603
comes supplied, and
the
charge
ac-
cumulated on C6LZ positively
biases Q601
via R603,
so
that
Q601
goes
ON, and
C61?
discharges
via SL601 -
Q601.
4. This
discharge
is the
means
by
which
the
release solenoid operates, so releasing
the
function button which
has
been
depressed.
5.
This
circuit,
if
S15 is ON
will
operate
if
the
power supply is interrupted, and automati-
cally
release the
function button.
Fis.
13
3.7
TAPE SPEED SWITCHING.OVER
The
capstan
motor is
a hysteresis synchronous
type,
operates
at the
main power
supply
frequency. Speed switching
is
effected
by
altering the number
of
poles
by
means
of
the
SPEED SELECTOR switch
S8
19
cm/s(7-1l2
ips.)
4 poles
9.5cm/s(3-3/4
ips.)
8 poles
2SA6?2
tB)x2
11
Fig.
12