Teac V-2RX - Recording Performance (Cont.); Erase and Separation Checks; Crosstalk and Noise Reduction Checks

ADJUST MEASURING
[
SETTING
INPUT
SIGNAL
i
CHECK)
POINT:
RESULT
REMARKS
¢
Connection
is
same
as
in
Fig.
5-1,
but
engage
1-kHz
filter.
@
Record
a
1-kHz
signal.
Rewind
tape
to
midpoint
of
recorded
portion.
Record
a
“no
signal”
portion.
Find
the
difference
between
the
1-kHz
portion
and
the
“no-signal”’
portion.
;
16.
Erase
=
efficiency
LINE
IN:
1
kH2/+1
dB
TAPE
sw.:
METAL
OUTPUT:
Tape:
MTT-5072
sare
Vv}
Check
65
dB
min.
ratio
a
no
signal
|
17,.REC MUTE =
Connection:
Fig.
5-1,
but
engage
1-kHz
filter.
e
Record
a
1-kHz
signal.
Hold
REC
MUTE
button
depressed
for
several
seconds.
(At
this
time,
make
sure
LED
on
the
button
lights).
Rewind
and
play
the
tape.
Find
the
difference
between
the
1-kHz
portion
and
the
“no-signal”’
portion.
—
function
LINE
IN:
1
kHz/+1
dB
TAPE
sw.:
METAL
OUTPUT:
Tape:
MTT-5072
aie
v)
Check
65
dB
min.
ratio
no
signal
_|
18.Channel
separation
19. Adjacent track
crosstalk
¢
Connection
Fig.
5-1,
but
do
not
connect
LINE
IN
(R),
and
engage
1-kHz
filter.
@
Set
the
deck
to
record
mode.
Find
the
difference
between
the
1-kHz
recorded
portion
L
({L-ch)
and
the
‘no
signal”
portion
(R-ch).
Lt
LINE IN:
L-ch 1 kHz/-9 dB
(275 mV)
R-ch No signal
TAPE sw.: METAL
Tape: MTT-5072
OUTPUT:
30 dB min. ratio
¢
Connection:
Fig.
5-1,
but
do
not
connect
LINE
IN
(L)
and
OUTPUT
(L).
e
Record
a
125-Hz
signal
on
R-ch
and
note
output
level.
Invert
tape
and
play
R-ch
track.
Check
leakage
level
against
the
output
reference
of
previously
recorded
portion.
LINE IN:
L-ch No signal
R-ch 125 Hz/-9 dB
(275 mV)
TAPE sw.: METAL
Tape: MTT-5072
OUTPUT:
40 dB min. ratio
Check
@
Record
a
1-kHz
signal
with
NR
SYSTEM
switch
OUT.
Play
this
portion
with
NR
SYSTEM
switch
set
to
OUT
and
set
to
O0
.
Obtain
the
difference
in
output
level
between
OUT
and
00
positions.
20.DOLBY
NR
Repeat
the
above
process
using
a
10-kHz
signal.
effect
-
;
;
ae
TAPE
sw.:
METAL
EINE
IN:
OUTPUT:
tse
MTT5072
1
kHz/~32
dB
Check
Variation
Ss
neu
(19.5
mV)
3
dB
~
8
dB
TAPE
.
METAL
LINE
IN:
OUTPUT:
Tape:
MTT-BO72
10
kHz/-42
dB
Check
Variation
[_
|
has
(6.15
mV)
8
dB
~
12dB
TAPE
sw:
METAL
TAPE
sw:
NORMAL
(dB)
Tape:
MTT-5072
(dB)
Tape:
MTT-501
ice
——-
=:
-
-_—-
7
$3
xo
ee
og
a
eae
SO
captain
+2
—
>
$=
Z
i>
=
=n
ay
a
:
°
o
-2
:
-
-2
-4
C
S:,,
1-4
-4
A
~Sa,
i
-4
6
———
our
OM
6
“6
out.
ae
~8
NI
SYSTEM
4)
Aarne
DOLBY
NA
-8
NR
system
[
Sesenemy
DOLBY
NR
="
DBx
—-—
DBx
4063
200
ak
63k
Bk
Tk
(Hz)
4063
400
ak
63K
8k
dak
(Hel
Fig.
5-8
Overall
frequency
response
[METAL]
Fig.
5-10
Overall
frequency
response
[NORMAL]
TAPE
sw:
Co
(CrO,)
pe
Tape:
MTT-5061
+4
+2
fe)
NR SYSTEM4 -------- DOLBY NR
1 1
40
63
400
4%
=
63k
8k
14k
(Hz)
Fig.
5-9
Overail
frequency
response
[Co
(Cro,
)]
V-2RX/V-4RX