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Fostex G16 - Page 11

Fostex G16
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11)
POWER-OFF
(U101-10),
REEL-BOOST-O
(UI
01-15)
LOW
level
is
input
to
POWER-OFF
at
about
the
same
instant
when
power
is
switched
off
and
returns
cam,
which
could
be
in
standby
or
other
than
loading
posi
tion,
to
the
loading
position.
REEL-BOOST-O
is
the
output
for
controlling
the
voltage
applied
to
the
reel
motors
and
a
high
voltage
is
applied
when
level
is
HIGH.
12)
RC-PULSE1-0
(U10
1-13),
RC-PULSE2-0
(U101-1
1),
PWM-0
(U101-9)
Speed
controlling
output
ports
at
FAST
WINDING
of
the
reel
motors.
RC-PULSE1-0
and
RC-PULSE2-O
output
an
approximately
lOusec.
pulse
in
sync
with
the
count
pulse.
This
pulse
operates
the
Q8
and
Q9
sample
hold
circuit.
PWM-O
is
the
output
for
determining
the
speed
at
FAST
WINDING,
and
the
longer
the
cycle
of
HIGH
level
compared
to
the
cycle
of
the
LOW
level,
the
faster
it
will
be.
This
output
is
inverted
by
U8,
integrated
by
C38,
then
applied
to
the
Q10
constant
current
circuit
to
control
the
current.
RC-PULSE2-0
RC-PULSE1-0
UI
7
collector
Fig.
3.2
Output
of
Q9
is
applied
to
the
takeup
reel
motor
by
UI
09-7
and
UI
10,
and
voltage
will
fall
to
reduce
the
takeup
reel
torque,
if
speed
is
too
fast.
Again,
output
of
Q9
is
inverted
by
UI
09-1,
and
applied
to
the
supply
reel
motor
by
UI
10,
and
voltage
will
rise
to
raise
torque
of
the
supply
reel,
thus
reducing
the
speed.
13)
EDIT-STOP-I(U101-12)
Q13
will
switch
off
and
a
HIGH
level
is
input
to
this
pin
when
the
jog
knob
is
at
the
center.
When
in
the
EDIT
mode,
the
jog
knob
center
is
detected
by
this
input.
14)
MT0-O
(UI
01-33),
MT1-0
(U101-34),
ALL
IN-0
(U101-35),
TR-REC-0
(U101-36)
MTO-O
MT1-O
Normal
0
0
Tempo
rary
Perma-
-
nent
Calibra
tion
2nd-
METER
0
1
1
CLK
1
0
1
DATA
9

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