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Teac A-300 - Recording Performance Adjustments (Continued); Signal-to-Noise Ratio and Erase Efficiency

Teac A-300
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6-3-6.
SIGNAL
TO
NOISE
RATIO
—-
OVERALL
—
Specifications:
CrO,:
45
dB
(min.)
NORMAL:
44
dB
(min.)
CrO,
1.
Load
a
TEAC
MTT-506
test
tape.
2.
Place
the
deck
in
the
record
mode
for
a
few
seconds
with
no
signal
applied.
3.
Rewind
and
play
this
recorded
(erased)
section.
4.
Read
the
indication
on
the
AC
Voltmeter.
5.
Compare
the
output
reading
to
the
specified
output
level
(—5
dB-or
436
mV).
6.
<A
difference
of
45
dB
or
more
is
required.
NORMAL
7,
Repeat
the
“CrO,”
procedure,
except
use
the
TEAC
MTT-501
test
tape
and
set
BIAS/EQ
switches
to
NOR-
MAL
position.
8.
A
difference
of
44
dB
or
more
is
required.
6-3-7,
ERASE
EFFICIENCY
Specification:
65
dB
(min.)
NOTE:
To
measure
erase
efficiency,
a
1
kHz
narrow
band-
pass
filter
should
be
used.
The
test
signal
delivered
from
the
AF
oscillator
should
be
tuned
to
the
fil-
ter
used.
Numbers
in
parentheses
correspond
to
steps
in
Fig.
6-16.
1.
Load
a
TEAC
MTT-506
test
tape.
2.
Apply
and
record
a
1
kHz
signal
at
+1
dB
(0.869
V)
for
several
seconds...
0.0.0.0...
eee
eee
(1)
3,
Rewind
the
tape
to
the
mid-point
of
the
recording
and
remove
the
signal
from
the
LINE
IN
jacks.
.....
(2)
4,
Place
the
deck
in
the
record
mode
and
record
through
this
previously
recorded
portion
with
no
input
signal
APPHCds
cen
suet
ee
at
Bt
ee
ae!
Be
(3)
5.
Rewind
the
tape
to
the
starting
point
of
the
1
kHz
signal
recorded
portion
...............04.
(4)
6.
Play
the
tape
and
read
the
indication
on
the
AC
Volt-
meter
to
obtain
the
output
level
of
both
the
unerased
portion
and
the
erased
portion
of
the
recorded
section
ene
Pe
ule
atts
fa
Sen
vitialies
to
Souca
to's
Te
og
RA
rnateh
Shah
Ms
Teh
(6)
7.
Measure
the
output
level
differences
between
the
2
portions.
8.
A
65
dB
difference
or
more
is
required.
Preparations:
Connection:
See
Fig.
6-5,
Switch
Setting:
BIAS
DOLBY
NR
|
MONITOR
Control
Setting:
OUTPUT:
Specified
Setting
(See
6-1-2)
LINE:
Specified
Setting
(See
6-2-2)
MIC:
Minimum
Preparations:
OSCILLOSCOPE
°
AMP
SPKR
@
®
AC
Voltmeter
DECK,
under
TEST
\kHz
FILTER
Fig.
6-15
Connection
Switch
Setting:
Control
Setting:
OUTPUT:
Specified
Setting
(See
6-1-2)
LINE:
Specified
Setting
(See
6-2-2)
MIC:
Minimum
17

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