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Fostex G16 - Page 39

Fostex G16
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4.2.6.10
Adjusting
the
Count
Pulse
Duty
and
Fast
Winding
Speed.
1)
Swing
open
the
SYSTEM
CONTROL
PCB
by
taking
two
screws
out.
2)
Rotate
the
R300
(H)
fully
CCW
from
the
parts
side
of
the
PCB.
3)
Put
transport
in
the
F.
FWD
or
RWD
mode.
4)
Monitor
the
testpoint
1
waveform
with
an
oscilloscope.
5)
Adjust
R302
on
the
SYSTEM
CONTROL
PCB
for
a
50%
duty
of
the
testpoint
1
wave
form
(shown
in
Fig.
4.10)
6)
Monitor
the
testpoint
2
waveform
with
an
oscilloscope.
7)
Adjust
R303
on
the
SYSTEM
CONTROL
PCB
for
a
50%
duty
of
the
test
point
2
wave
form.
(shown
in
Fig.
4.10)
8)
Confirm
that
there
is
90°
(degree)
phase
difference
between
test
point
1
waveform
and
test
point
2
wave
form
during
the
F.
FWD
or
RWD
mode,
(shown
in
Fig.
4.10)
F.
FWD
mode
RWD
mode
Fig.
4.10
9)
Monitor
the
test
point
1
waveform
with
an
oscilloscope.
10)
Put
transport
in
F.
FWD
or
RWD
mode.
11)
Adjust
R300
(H)
so
that
testpoint
1
wave
length
at
maximum
speed
(winding
the
begin
ning
of
the
tape
in
F.
FWD
or
winding
the
end
of
the
tape
in
RWD)
is
0.65
msec.
And
confirm
that
the
difference
of
the
maximum
winding
speed
in
F.
FWD
and
in
RWD
should
be
within
0.03
msec.
12)
Holding
the
|F.
FWD|
or
|REWIND|
button
of
the
controller
down.
36

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