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3M DELTA Series - Master Record Head Azimuth; Other Reproduce Head Azimuth

3M DELTA Series
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A
0*
PHASE
SHIFT
c
SO*
or
270*
PHASE
SHIFT
l
*>
7
-
Figure
3-17
1.
Connect
the
vertical
input
to
the
same
right
channel
output.
Adjust
the
vertical
gain
to
provide
a
deflection
equal
to
that
of
the
hori
zontal
above.
g.
Connect
the
horizontal
input
to
the
left
chan
nel
output.
Run
the
tape
to
the
1
kHz
section.
A
pattern
such
as
Figure
3-17
(a)
should
now
appear.
If
not,
reverse
the
two
leads
of
the
horizontal
input.
This
pattern
represents
the
"0"
or
near
"0"
phase
shift
pattern
of
the
sys
tem.
h.
Allow
the
tape
to
run
to
the
4
kHz
section
and
observe
if
phase
shift
has
occurred.
Refer
to
Figures
3-17
(a)
through
(d).
If
phase
shift
has
occurred,
adjust
the
play
head
azimuth
screw
to
correct
this
phase
shift
in
the
exact
reverse
rotation
to
which
it
has
occurred.
This
means
that
if
the
pattern
was
increased
clock
wise
from
0
shift
as
frequency
increased,
the
azimuth
screw
should
be
turned
in
such
a
way
to
cause
the
scope
display
to
rotate
counterclockwise
back
to
the
”
0"
position.
i.
Allow
the
tape
to
continue
through
the
var
ious
frequencies.
Observe
the
scope
display
to
insure
that
no
180°
reversals
occur.
At
16
kHz
final
adjustment
of
the
azimuth
screw
can
be
made
to
provide
best
average
phase
shift.
It
is
normal
for
shift
"jitters"
of
several
degrees
to
occur
at
the
highest
frequencies.
so
setting
should
be
based
on
best
results.
It
is
desirable
to
run
the
tape
several
times,
ob
serving
that
phase
reversals
do
not
occur
at
any
frequency.
Tighten
the
lock
nut
and
ob
serve
that
no
change
occurs.
2.
Master
Record
Head
Azimuth
a.
Select
a
3-1/2
minute
cartridge
that
is
known
to
have
consistently
good
operating
charac
teristics.
b.
Connect
a
tone
generator
to
both
inputs,
and
inject
a
14.5
kHz
tone
and
adjust
the
Normal
Record
level
to
-10
VU.
c.
Start
the
recorder
and
adjust
the
recording
head
azimuth
screw
for
maximum
amplitude
of
the
display
on
the
scope.
The
scope
gains
may
be
adjusted
in
equal
amounts
to
in
crease
amplitude
of
the
display
if
necessary.
d
Set
the
frequency
of
the
tone
generator
to
50
Hz.
Slowly
increase
the
tone
frequency
while
observing
the
phase
rotation
on
the
scope
display.
If
phase
error
or
reversal
begins
to
occur,
slowly
adjust
the
azimuth
screw
of
the
record
ing
head
only
to
retain
minimum
phase
shift
pattern.
Because
the
frequency
continues
to
increase,
each
azimuth
adjustment
with
suc
ceeding
tones
tends
to
"fine-tune"
the
head
assembly
for
a
very
accurate
alignment.
Re
peat
this
procedure
again
and
observe
the
results.
When
the
14.5
kHz
tone
occurs,
hold
it
continuously.
Tighten
the
azimuth
lock
nut
while
making
certain
that
the
phase
does
not
change.
3.
Other
Reproduce
Head
Azimuth
It
is
important
to
realize
that
all
reproducers
within
a
system
must
be
azimuth
aligned
to
the
master
recorder.
To
implement
this,
it
is
neces
sary
to
prepare
a
test
cartridge
recorded
on
the
master
recorder
each
time
any
adjustment
to
this
recorder
is
performed.
This
cartridge
is
in
turn
used
to
align
EACH
reproducer
in
the
sys
tem,
using
the
technique
outlined
in
Section
III,
J-l,
above.
Figure
3-18
3-9

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