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Fostex A-8 - Page 40

Fostex A-8
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3)
Set
the
GROUP
select
switch
to
1-4
and
depress
1/5
of
the
RECORD
TRACK
button.
Depress
the
RECORD
and
PLAY
buttons
to
put
TRACK
1
in
the
record
mode.
When
thus
in
the
record
mode,
the
meter
will
indicate
the
input
level
regardless
to
select
position
of
the
input
button.
Check
to
see
that
the
reading
of
this
meter
is
0
VU
±1
VU.
4)
It
will
be
convenient
to
rewind
the
tape
to
the
start
if
the
tape
index
counter
reset
button
is
depressed,
at
start
of
recording,
to
return
the
display
to
0000.
5)
After
recording
a
certain
length
of
400Hz,
0
VU
signal,
depress
the
ZERO
RTN
button
to
rewind
tape
to
the
starting
point,
put
the
transport
in
the
PLAY
mode
and
check
the
meter
reading.
The
MONITOR
switch
must
be
at
TAPE.
It
is
in
normal
condition
if
the
meter
reading
is
0
VU
±1.5
VU.
If
it
is
off
spec,
correct
by
adjusting
REC
LVL
R315,
5KQB.
Do
the
same
on
the
remaining
tracks
2,
3
and
4.
For
adjusting
tracks
5,
6,
7
and
8,
set
GROUP
select
to
5-8
and
follow
the
same
procedures
as
for
TRACK
1.
6.4.8
Overall
frequency
response
1)
With
the
front
panel
NR
INT/EXT
switch
at
EXT
and
under
the
measurement
setup
of
the
previous
Section
6.4.7,
apply
signals
from
40Hz
through
18KHz
at
-lOdBV
(0.3V)
to
the
recorder
INPUT
jack
and
set
the
NR
switch
to
INT.
To
adjust
TRACK
1,
for
example,
apply
the
signal
to
INPUT
1
and
plug
in
a
level
meter
to
OUTPUT
jack
1.
Put
TRACK
1
in
the
record
mode
to
record
a
certain
length
of
the
signal,
rewind
it
to
the
start,
and
playback
the
tape.
It
is
in
good
normal
condition
if
the
frequency
response
in
reference
to
400Hz
is
within
+3dB
and
-3dB.
If
it
does
not
fall
within
spec
in
the
high
frequency
region,
correct
it
by
a
slight
rotation
of
REC
EQ
pot
R316,
IKQ
b
.
2)
Check
and
adjust
the
remaining
tracks
in
the
same
way.
6.4.9
Overall
S/N
measurement
1)
Set
the
front
panel
NR
INT/EXT
switch
at
INT.
2)
Upon
completing
checking
up
to
Section
6.4.8,
apply
a
400Hz,
-lOdBV
(0.3V)
sig
nal
to
the
rear
panel
INPUT
jack
1
(example
for
track
1),
record
the
signal
onto
a
blank
tape,
then,
without
stopping
the
tape,
unplug
the
oscillator
connected
to
the
INPUT
jack
and
further
record
a
length
of
no-signal
tape.
3)
Plug
a
level
meter
into
OUTPUT
jack
1,
playback
the
recorded
signal
section
to
measure
the
noise
level
of
the
no-signal
section
against
the
400Hz
reference
level,
calculate
the
difference
between
noise
level
and
reference
level,
add
12dB
to
it
and
obtain
the
ratio
between
peak
recording
level
and
noise
level.
40

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