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3M DELTA Series - Monophonic Head Azimuth Adjustment

3M DELTA Series
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ments.
Be
careful
to
avoid
scratching
the
face
of
the
head.
When
the
head
is
perpendicular,
the
face
of
the
head
and
the
"square"
will
be
flush
4.
Fine
Height
and
Zenith:
This
adjustment
is
made
using
the
alignment
gauge,
a.
Position
the
gauge
in
front
of
the
face
of
the
head
as
the
tape
would
be
positioned
if
it
were
being
played
as
shown
in
Figure
3-15.
b.
Alternately
adjust
the
Rear
and
Front
Height
set
screws
to
position
the
top
of
the
upper
head
track
(pole
piece)
so
that
it
is
even
with
the
upper
edge
of
the
gauge.
Position
the
bottom
of
the
lower
head
track
(pole
piece)
so
that
it
is
even
with
the
lower
edge
of
the
gauge.
The
set
screw
should
be
adjusted
by
equal
amounts
in
the
same
direction
to
main
tain
zenith.
c.
Recheck
the
zenith
of
the
head
as
instructed
in
Step
3.
If
adjustment
is
necessary,
height
must
also
be
rechecked
and
adjusted
until
both
height
and
zenith
are
correct.
d.
Carefully
tighten
the
Front
and
Rear
Height
Lock
Nuts.
Recheck
the
height
and
zenith
adjustments.
If
a
change
has
resulted,
repeat
the
Fine
Height
and
Zenith
adjustment.
Special
Note
It
is
important
to
note
that
the
location
of
the
Azimuth
adjustment
screw
is
offset
considerably
from
the
head
it
adjusts.
The
Record
Head
azimuth
screw
is
physically
located
in
between
the
two
zenith
screws
directly
to
the
rear
of
the
Play
head.
Likewise,
the
Play
head
azimuth
screw
is
located
in
between
the
two
zenith
screws
located
behind
the
Record
head.
The
compact
design
of
the
Delta
Series
allowed
the
azimuth
arms
to
be
"crossed"
in
order
to
maintain
the
maximum
length
of
the
pivoting
section
to
be
contained
in
a
very
small
area.
When
adjusting
Record
or
Play
head
azimuth,
make
certain
the
appropriate
azimuth
control
screw
is
used.
1
MONOPHONIC
HEAD
AZIMUTH
ADJUSTMENT
Before
attempting
these
adjustments
insure
the
following:
the
mechanical
adjustment
of
the
tape
guides
as
outlined
in
Section
III
G;
and
the
adjust
ment
of
height
and
zenith
of
both
the
Record
and
Reproduce
heads
(or
Reproduce
and
"dummy"
in
Reproduce
only
machines)
as
outlined
in
Section
III
H,
are
correct.
1.
Reproduce
Head
Azimuth
Adjustment:
a.
Connect
a
600
ohm
load
to
the
reproduce
amplifier
output
terminals.
Connect
a
high
impedance
voltmeter
across
this
load.
b.
Insert
a
15
kHz
Standard
Azimuth
Alignment
Tape
and
start
the
machine.
c.
Adjust
the
reproduce
head
azimuth
set
screw
as
shown
in
Figure
3-11
to
produce
maxi
mum
output
level.
d.
Carefully
tighten
the
lock
nut
while
observing
the
voltmeter
to
insure
that
no
change
in
output
level
occurs.
2.
Record
Head
Azimuth
Adjustment
Be
aware
that
changes
in
azimuth
to
the
"Master"
Record
head
can
result
in
azimuth
errors
in
all
the
Reproduce
machines
within
a
system
unless
the
resultant
azimuth
is
carefully
checked
against
each
of
these
Reproducers.
Any
change
in
azimuth
of
the
record
head
should
be
attempted
ONLY
AFTER
all
mechanical
adjust
ments
are
carefully
checked
and
the
"Master"
Reproduce
head
is
aligned
to
the
15
kHz
Stand
ard
Azimuth
Alignment
Tape
as
above.
a.
Select
an
erased
3-1/2
minute
cartridge
which
is
known
to
have
consistently
good
operating
characteristics.
It
is
suggested
that
this
car
tridge
be
set
aside
and
used
only
for
record
ing
head
adjustments.
It
thus
will
become
the
standard
for
your
operation.
b.
Connect
a
600
ohm
load
to
the
Reproducer
output
terminals.
Connect
a
high
impedance
voltmeter
across
this
load.
c.
Use
a
tone
generator
to
generate
14.5
kHz
and
adjust
the
Normal
Record
Level
to
-10
VU.
d.
Start
the
recorder
and
adjust
the
record
azi
muth
set
screw
on
the
record
head
to
pro
duce
maximum
output
level.
e.
Carefully
tighten
the
lock
nut
observing
the
voltmeter
to
insure
that
no
change
in
output
level
occurs.
J.
STEREO
SYSTEM
HEAD
AZIMUTH
ADJUSTMENT
Two
track
stereo
recording-reproducing
per
formance
is
subject
to
several
contributing
mechan
ical
inaccuracies
which
can
cause
phase
shift
in
simultaneously
monitored
reproducer
outputs.
In
stereo
systems
these
phase
shifts
are
generally
not
perceptable
in
the
final
reproduction;
however,
in
cases
where
monophonic
"dubbing"
or
channel
summing
is
desired,
phase
shifts
can
result
in
serious
amplitude
variations
or
dropouts,
especially
at
the
higher
frequencies.
Most
common
causes
of
these
problems
are:
1.
Lateral
displacement
of
the
pole
pieces
with
respect
to
each
other
within
the
head
case.
2.
Improper
azimuth
of
the
heads
with
respect
to
each
other,
(record
head
to
play
head
on
any
3-7

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