Teac A-4010GSL - Erase Efficiency

ERASE EFFICIENCY
bo
NOTE:
To
measure
erase
efficiency,
4
1
kHz
band
pass
filter
(TEAC
M-204
CL
filter)
must
be
used.
The
LINE
and
OUTPUT
con-
trols
must
be
at
specified
level
position.
Due
to
the
high
level
of
this
signal,
it
is
recommended
that
only
a
short
recording
be
made
(approximately
30
seconds)
to
prevent
damage
to
the
VU
meters.
Apply
a
1
kHz
signal
at
0
dB
to
the
LINE
IN
jacks.
Place
the
unit
in
record
mode
and
record
this
signal.
Rewind
the
recording
to
the
beginning
and
remove
the
AF
oscil-
lator
from
the
LINE
IN
jacks.
_
—
Place
the
unit
in
RECORD
mode
and
record
over
this
portion
of
tape
again.
Rewind
the
tape
to
the
starting
point
and
connect
a
level
meter
to
the
OUTPUT
jack,
through
the
1
kHz
band
pass
filter.
Play
the
erased
portion
of
the
tape.
The
level
meter
should
indicate
-62
dB
or
less.
IKHz
BANO PASS
FILTER
0-0577
Fig.
6-15
Erase
Eficiency
Set-up