Teac A-3340 - RECORD LEVEL SETTING; OVERALL FREQUENCY RESPONSE

Fine Adjustment
NOTE
It
is
absolutely
essential
to
accomplish
the
coarse
adjustment
before
using
this
method,
to
avoid
phase
error
larger
than
45°
~~
Connect
the
test
equipment
as
shown
in
Fig.
7-8.
8.
Apply
a
7.5
kHz
signal
at
-25
dB
to
the
LINE
IN
jacks
and
record
this
signal.
9.
Carefully
adjust
the
azimuth
screw
until
the
oscilloscope
shows
the
signal
to
be
in
phase.
10.
Secure
the
screw
with
a
drop
of
LOCTITE.
SIGNAL RECORDED TAPE
0-039!
Fig.
7-8
Fine
Adjustment
Set
Up
-Head
Azimuth-
RECORD LEVEL SET
1.
The
output
controls
must
be
at
the
specified
output
level
posi-
tion
(-8
dB
at
output
jacks).
2.
Apply
a
400
Hz
signal
at
-8
dB
to
the
LINE
IN
jacks.
3.
Place
the
unit
in
the
record
mode,
the
MONITOR
switch
in
the
TAPE
position.
4.
Adjust
VR
302/305
for
a
reading
of
0
VU
on
the
VU
meter
(-8
dB
at
the
OUTPUT
jacks).
OVERALL
FREQUENCY
RESPONSE
—_——_—_——_—_—_——__-e——c—oe—aaaar
IMPORTANT
To
avoid
saturation
of
the
tape,
these
checks
should
be
made
at
least
20
dB
below
the
specified
input
level.
Any
bias
signal
feeding
into
the
test
equipment
should
be
filtered
out
by
adjusting
the
external
bias
trap.
A
broad
band
VTVM
may
be
used
on
the
output
of
the
unit
for
this
ad-
justment.
-BIAS switch in NORMAL position-
1.
Adjust
the
AF
oscillator
to
obtain
an
output
level
of
-30
dB(approx.
20
dB
below
specified
output
level)
at
OUTPUT
jacks.