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3M DELTA Series - Master Reproduce Head Azimuth

3M DELTA Series
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DELTA
Figure
3-16
reproducer
in
a
system.
)
3.
Improper
tape
guidance
(skew)
either
within
the
cartridge
or
through
the
tape
guide
system.
ITC
has
provided
the
best
features
possible
to
assist
in
the
proper
guidance
of
tape
outside
of
the
cartridge.
Three
adjustable
tape
guides,
heavy-duty
microadjustable
patented
head
module,
and
the
use
of
"dummy"
heads
in
Reproduce
only
machines.
lead
to
consistent
guidance
of
the
tape
through
the
head
assembly.
Gauges
are
made
available
for
maintaining
accurate
adjustment
and
maintenance
of
these
assemblies.
These
are
measures
taken
by
ITC
to
aid
in
maintaining
the
best
possible
stereo
performance
from
this
equipment.
The
following
tests
and
adjustments
do
not
preclude
the
many
possible
techniques
for
measuring
phase
shift.
They
do.
how
ever,
provide
the
basis
for
satisfactory
results
using
a
minimum
of
equipment
and
skill:
1.
Master
Reproduce
Head
Azimuth
—
See
"Spe
cial
Note"
in
preceding
section,
regarding
the
unique
location
of
the
Azimuth
adjustment
screws.
a.
Connect
600
ohm
loads
to
both
left
and
right
channel
outputs.
Connect
a
high
impedance
voltmeter
to
the
left
channel
output.
Insert
a
STEREO
1
kHz
reference
"0"
level
tape
and
start
the
machine.
Set
left
gain
control
R109
for
0
dBm
output.
Now
connect
the
voltmeter
to
the
right
channel
output
and
adjust
right
gain
control
R1
10
for
0
dBm
output.
b.
Insert
a
15
kHz
STEREO
azimuth
alignment
tape
and
carefully
adjust
the
playhead
azi
muth
screw
for
a
maximum
reading
on
the
voltmeter.
Observe
the
mechanical
position
of
the
azimuth
screw.
c.
Move
the
voltmeter
to
the
left
channel
output.
Now.
move
the
azimuth
screw
a
small
amount
in
either
direction
and
observe
the
voltmeter
reading
as
an
increasing
or
decreasing
out
put.
Continue
moving
the
screw
in
the
direc
tion
that
produces
increasing
output
until
a
maximum
reading
is
obtained.
d
Observe
the
direction
and
degree
that
the
screw
was
turned
to
obtain
maximum
read
ing
on
the
left
output
with
respect
to
the
pre
vious
setting
for
maximum
on
the
other
chan
nel.
Set
the
azimuth
screw
to
the
midpoint
between
these
settings
to
obtain
AVERAGE
azimuth
for
the
two
channels.
e.
Connect
the
horizontal
input
of
a
scope
so
equipped
to
the
right
channel
output.
Insert
a
STEREO
FREQUENCY
ALIGNMENT
TAPE
and
start
the
machine.
Adjust
the
horizontal
gain,
if
provided
on
the
scope
to
a
suitable
ampli
tude.
Remove
the
horizontal
input.
3-8

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