Teac A-4010GSL - Record Head Azimuth Adjustment

IMPORTANT:
Before
making
any
adjustments
on
the
record
amplifier,
be
sure
that
all
tests
in
the
HEAD
ALIGNMENT,
PLAYBACK
and
MONITOR
PERFORMANCE
sections
have
been
accomplished,
Optimum
recording
performance
(Bias
levels,
recording
levels
and
frequency
response)
is
dependent
upon
tape
characteristics.
The
TEAC
A-4O10GSL
is
factory
set
for
Scotch
#203
tape.
Service
data
is
based
upon
the
use
of
Scotch
#203
or
equivalent
tape.
RECORD
HEAD
AZIMUTH
ADJUSTMENT
Coarse Adjustment
NOTE:
The
effect
of
turning
the
azimuth
screw
will
not
imme-
diately
register
on
the
level
meter.
A
slight
delay
will
be
noticed.
Therefore,
the
screw
must
be
rotated
slightly,
and
then
pause
to
see
the
effect.
1.
Connect
a
Level
Meter
to
the
OUTPUT
jacks
and
an
AF
oscillator
to
the
LINE
IN
jacks.
2.
Place
the
MONITOR
switch
to
SOURCE
and
adjust
the
AF
oscillator
to
obtain
a
signal
of
15
dB
below
the
specified
level.
(The
level
meter
will
indicate
-23
dB).
After
this
is
set,
turn
MONITOR
switch
to
TAPE
position.
3.
Make
certain
that
the
LINE
control
is
at
the
specified
input
level
position,
then
.
get
the
AF
oscillator
to
10
kHz.
4.
Thread
a
record
test
tape
on
the
unit
and
record
this
signal.
5.
Adjust
the
azimuth
screw
for
maximum
indication
on
the
level
meter.
Fig.
6-7
Fine
Adjustment
Set-up
Fine Adjustment
NOTE:
It
is
absolutely
essential
to
accomplish
the
coarse
adjustment
before
using
this
method,
to
avoid
phase
error
larger than 45°
6.
Connect
the
test
equipment
as
shown
in
figure
below.
7.
Apply
a
10
kHz
signal
at
-~23
dB
to
the
LINE
IN
jacks
and
record
this signal.
8.
Carefully
adjust
the
azimuth
screw
until
the
oscilloscope
shows
that
the
signal
are
less than
45°
in
phase.
9,
After
adjustment
secure
the
azimuth
and
height
adjustment
screws
with
a
drop
of
LOCTITE.