Advertisement
6.6
.
1
Head Azimuth and
Wrap
Check /
Adjustnent
Procedure
-
MRL Test
Tape
(
or equivalent
)
-
Flat Blade Screwdriver
-
ACVM ( HP 400 FL
or equivalent
)
-
Oscilloscope
-
2 mm Hex Allen Driver
Necessary
Tools
:
-
Mechanical Headstack Check /
Adjustment
Prerequisit
es
:
-
All channels will
be
in
phase
(
zero phase
difference )
by
azimuth
adjustment
.
-
The reproduced level of all channels
on
each head
are
maximized
by
the
wrap
adj
us tment
In
Section 6.5
,
procedures
were given to
adjust
the heads
in
relationship
to the tape path
( head
height
and head zenith )
.
The
following procedures are given
for the check /
adjustment
of the head
wrap
and head
azimuth
refering
to the electrical
signal output
from the heads
.
These fine
adjustments
should
not affect the
tape path
accross the headstack
yet
will
perform
the
optimization
of the audio
response
of the heads
in
regard
to playback levels and phase
relationship
.
Specificat
ion
:
Azimuth
adjustments are especially important
,
g a p s
are not all parallel to the direction the
tape
is
traveling
,
segments
of the same recorded
wavelength
w i l l
enter and leave each
gap
at different increments of time
.
The head azimuth
adjustment
performs the
fine
adjustment
of
the
phase relationship
between all channels of the multitrack
head
.
difference between all channels
.
If
the head
This
adjustment
is set so that there is minimum
phase
The head
wrap
adjustment is an eccentric
mounting screw
which
controls the position of the head
gap
in
relationship to the
tape
which is
entering or leaving
the head surface
,
audio
playback
level
peaks
( achieves maximum
amplitude
) when
the
gap
is located
in
the exact center of the
angle at
which
the
tape
touches the
head
an equal
distance on
each
side of
the head
gap
.
The
These
adjustments are not
necessary
unless the
tape path
has been
changed or adjusted due to
the
replacement of a worn
component
,
or the installation of a new headstack
.
headstack is
being replaced
,
refer to Section 6.3
.
1
.
If the
nr
6
-
42
Advertisement
