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Fostex A-8 - Page 20

Fostex A-8
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*
RESET
:
The
counter
and
display
are
reset
to
"all
zero"
by
an
"H"
level
to
this
pin.
*
AC
IN
:
The
AC
power
line
frequency
(50/60Hz)
is
applied
here
for
the
reference
frequency.
*
OUT
1
:
At
the
instant
the
counter
register
changes
from
0001
to
0000,
this
driver
output
pin
goes
to
"H"
for
a
duration
of
200
%
400msec.
*
SIX/DECADE
;
An
"L"
(or
open
pin)
to
this
pin
sets
the
counter
to
decimal
count

ing
or
an
"H"
to
modulo-six
of
digit
two.
This
pin
is
kept
at
"L"
,
or
at
open,
in
this
system.
*
SEG
la
n,
4g
:
The
LED
segments
are
directly
driven
by
these
pins.
4.9
RECORD
TRACK
SELECT
(LED
display
circuit)
The
LED
corresponding
to
each
track
of
the
RECORD
TRACK
select
buttons
either
blink
or
light
continuously
to
indicate
the
mode
of
operation.
1)
Blinking
at
depressing
the
RECORD
TRACK
button
The
output
of
multi-vibrator
Ql
and
Q2
are
applied
to
Q3
which
switches
on/off
Q3,
Q4
and
Q5
at
about
1Hz
'V
2Hz.
The
output
of
Q5
is
connected
to
the
LED
anodes
via
the
GROUP
select
switch
and
the
cathode
of
the
LED
selected
by
the
RECORD
TRACK
button
is
connected
to
0V,
and
that
LED
will
blink.
2)
Blinking
of
the
GROUP
LED
(TRK
1
4
or
TRK
5
8)
The
transport
goes
to
the
record
mode
if
both
the
RECORD
and
PLAY
buttons
are
simultaneously
depressed.
Then,
if
none
of
the
RECORD
TRACK
button
is
depressed,
all
four
LED's
for
tracks
1
'L
4
or
5
%
8,
either
of
which
is
selected
by
the
GROUP
button,
will
blink.
The
+8V
supply
is
applied
to
the
LED
through
Q5
which
is
switched
on
by
the
record
mode
"L"
level
from
the
transport
control
circuitry.
Q6
is
switched
on
by
the
"L"
applied
to
its
base
and
an
"H"
is
thus
applied
to
the
base
of
Q9
but
as
the
emitter
of
Q9
is
connected
via
D5
to
the
collector
of
Q4
which
is
constantly
switching
on
and
off,
the
four
LED
blinks.
This
blinking
of
all
four
LED's
clearly
indicate
which
group
of
tracks
have
been
selected
and
when
any
one
of
the
RECORD
TRACK
button
is
depressed
while
in
this
state,
the
base
of
Q9
drops
to
zero
volt
thus
switching
it
off,
and
the
+8V
flows
through
D5,
LED,
DI
3
(or
D14,
DI
5,
D16)
,
then
to
zero
volt.
Therefore,
the
led
of
the
selected
track(s)
only
is
lighted
and
the
other
blinking
LED's
will
go
off.
3)
Constant
lighting
of
the
LED
The
LED
will
change
to
constant
lighting
when
any
one
of
the
RECORD
TRACK
button
is
depressed
during
the
RECORD
mode
or
when
this
order
of
depressing
the
button
20

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