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Fostex A-8 - Page 12

Fostex A-8
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Under
"H"
level
state
of
U2-2,.U2-13
will
also
be
at
"H"
level
and
consequently
U2-3
goes
to
"L"
level.
After
a
certain
delay,
U2-12
goes
to
"L"
level
and
thus
U2-11
goes
to
"H"
level.
4)
ZERO
RETURN
The
system
goes
to
REWIND
mode
when
the
ZERO
RTN
button
is
depressed
as
U9-2
pin
will
be
connected
to
zero
volt
via
D32.
On
the
other
hand,
an
"H"
level
is
applied
to
U4-7
(s
input
pin)
via
inverter
U7.
U4
is
a
JK
flip
flop
and
pins
Q
and
K
are
set
to
"H"
when
pin
s
is
set
to
"H".
At
the
instant
the
counter
display
changes
from
0001
to
0000,
the
emitter
of
Q3
is
held
at
zero
volt
for
a
length
of
about
200
400msec.
after
which
Q3
switches
on,
U9-6
(STP)
goes
to
"L"
and
U9
goes
to
STOP
mode.
The
"L"
output
from
the
counter
returns
to
"H"
after
about
200
®
400msec,
ap
plied
to
U4-3
(C
input)
and
the
Q
and
K
pins
returns
to
"L"
level.
U4-4
(R
input)
is
the
reset
pin
and
the
ZERO
RTN
is
reset
by
the
REWIND,
F.FWD,
STOP,
PLAY
and
SHUT
OFF
signals.
Fig.
4-1
12

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