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Fostex A-8 - Page 77

Fostex A-8
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If
the
trace
length
between
(1)
and
(2)
are
not
the
same,
it
means
that
the
two
inputs
are
not
of
the
same
level.
Correct
for
equal
lengths
by
the
oscilloscope
controls.
If
the
playback
head
azimuth
is
out
of
alignment
,
the
following
patterns
will
result:
(A
small
misalignment
30°
out
of
phase}
(A
larger
error
90°
outof
phase
)
(A
big
one,
180°
out
of
phase)
(Perfect
azimuth
0°,in
phase)
Fig.
6-13
As
a
result
of
phase
check
with
a
lOKHz
signal,
the
adjustment
is
finished
if
difference
in
phase
is
less
than
90°
between
tracks
and
azimuth
adjustment
is
at
the
best
point.
4)
Check
the
playback
frequency
response
of
each
channel
by
playback
of
the
Frequency
Response
section
of
the
Reproduce
Alignment
Tape.
The
recorder
VU
meters
can
be
used
for
this
check
but
if
a
more
accurate
measurement
is
necessary
,
the
level
meter
is
plugged
one
by
one
into
the
recorder
rear
panel
1^8
OUTPUT
jacks
and
the
levels
measured
here.
The
normal
playback
frequency
response
should
be
within
±3dB
for
a
frequency
range
of
50
'V
18,
OOOHz
(15
ips)
and
50
15,
OOOHz
(7-1/2
ips).
If
it
is
not
within
spec,
adjust
REP
EQ
R313,
lOKiiB
(odd
number
tracks)
or
R323,
IOKQ
b
(even
number
tracks)
.
5)
Whenever
R313
and
R323
are
adjusted,
the
Dolby
encode
must
be
recalibrated
-
(Item
5.2).
81

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