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5-7-3 FWD, REV and MANUAL operations
1) Any of these operations can be performed in the
UP mode
by the UP/DOWN
switch. At first,
when the FWD
switch is pressed, the FWD latch
is cleared
and
signal
FWD
becomes
"HH".
Then
the REV
latch is preset and signal REV
becomes "L".
At this time, since the tonearm is lifted up, it
is forwarded
with signal FWD
OUT
at H"
while the FWD switch is pressed. When the FWD
switch
is released, the FWD
operation
is can-
celed with
signal MANUAL
OUT
at "H'.
In
addition, while the REV
switch
is pressed, the
tonearm is reversed.
2) When the lead-out position is detected during
the FWD action, since the leading edge of signal
LEAD OUT at ''H" becomes the clock pulse of
the MANUAL/AUTO latch, the turntable enters
the auto mode with the data input (pin 5) of
1€102 at "L"'.
Signal
LEAD
OUT
at 'H'
becomes
the stop
5-7-4 DOWN operation
In this operation, when the UP/DOWN
switch is
pressed while the tonearm
is slided or manually
lifted up, the tonearm is lowered down. First, the
leading edge of signal UP/DOWN SW OUT at "H"
becomes
the clock pulse of the UP/DOWN
latch
through 1C103 (OR-B). Thus, signal DOWN OUT
becomes "'H'" with the © output (pin 12) and data
input (pin 9) of 1C102 both at H" when the tone-
arm
is lifted up,
thereby permiting the DOWN
5-7-5 Stop (lead-out/auto REV) operation
1) During play, when
the STOP/REV
switch
is
pressed or when the lead-out position is detect-
ed, the FWD latch is preset by signal STOP SW
OUT
at "H'
or signal
LEAD-OUT
at "H"
through D105. Thus, signal FWD becomes "L"'
and the REV latch is cleared.
At this time, signal REV becomes "H'' to clear
the UP/DOWN latch to make signal DOWN OUT
into "L".
2) Q107 (the control of the FWD and REV gates)
is turned OFF when the tonearm is lifted up.
Signal REV OUT at H" is emitted from pin 9
of REV gate 1C104 (AND-B), thus starting the
REV operation.
-19-
indication signal through D105. However, while
the FWD
switch is pressed, the FWD
latch is
cleared by signal FWD SW OUT and the REV
latch
by
signal
LEAD
OUT.
Subsequently,
signals FWD and REV become ''H''. Since the
inputs to the FWD and REV gates however be-
come
"L" at the respective 0. outputs of these
latches, signals FWD
OUT
and REV OUT be-
come ''L"'. Thus, the tonearm stops at the lead-
out position. When the FWD switch is released,
the stop operation (described later) is performed.
In addition, when the tonearm reaches the rest
position in the REV operation, signal PLAY of
the collector of Q106 becomes H". The turn-
table thus enters the initial mode.
3) When the START/FWD and STOP/REV switch-
es are both pressed without the tonearm at its
rest,
since
the
FWD,
REV
and
UP/DOWN
latches are all cleared, the tonearm
is inhibited
from moving in the UP mode.
operation.
At the same time, Q107 turns ON to
inhibit the FWD and REV operations.
At this time, the MANUAL/AUTO
latch is preset
to enter the auto mode.
in addition, the DOWN
operation is performed irrespective of the manual
or auto mode when required. Therefore, be careful
not to lower down the tonearm
outside of the
record in the start (auto FWD) or stop (auto REV)
operation. If so, play is made again,
3) During the REV action, even when the lead-in
Position is detected, the tonearm passes the lead-
in position as it is, because lead-in gate 1C104
{AND-C) remains ''L''. Subsequently, when the
tonearm
reaches
its rest, signal PLAY
at the
collector of Q106 becomes 'H''. Thus, the REV
operation is canceled to enter the initial mode.
4) During the REV action, when the DOWN switch
is pressed, the tonearm stops and lowers down.
(Refer to 5-7-4)
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