Teac V-909RX - Page 20

V-909RX/V-707RX/V-707R |
5-4 DBX PERFORMANCE (V-909RX/V-707RX)
Settings:
NR system sw: dbx
Note:
Test
this
performance
only
OUTPUT
cont.:
after you are sure that the
"5.5 DBX PCB ADJUST-
MENT" is correct.
INPUT
SIGNAL
ITEM
PREPARATION/SETTING
LINE IN:
Record-pause mode
21. Encoding level (146 mV)
Specified position (item 2)
ADJUST
(or CHECK)
TEAC test tapes:
MTT-5061: For record test with CrO2
MTT-501: For record test with NORMAL
MTT-5072: For record test with METAL
MEASURING
POINT: RESULT
1 kHz/—14.5 dB
RECORD cont.
TP.51/TP.61 on dbx PCB:
—8.2 dB (300 mV)
an
LINE
IN:
Record-pause mode
(146 mV)
LINE IN:
22.
Encoder
opera-
(146
uv)
-
tion
check
(level)
Record-pause mode
LINE IN:
(1.46 V)
1 kHz/—14.5 dB
1 kHz/—74.5 dB
1 kHz/+5.5 dB
R52/R62
TP.52/TP.62 on dbx PCB:
—8.2 dB (300 mV) ..... Reference 1
Check
TP.52/TP.62 on dbx PCB:
—30 dB +0.5 dB
variation from Ref.1
po
TP.52/TP.62 on dbx PCB:
LINE IN:
23..
Encoder
opera-
{146
mV)
tion
check
(frequency)
Record-pause mode
LINE IN:
100 Hz/—14.5 dB
10 kHz/—14.5 dB
Check
@ Record a 1 kHz signal with the NR system switch OUT. Rewind and play the
recorded portion. Note the off-the-tape level from OUTPUT (1). Repeat the
above process with the NR system switch set to ‘‘DBX’’. Note the off-the-tape
level (2). Compare the difference between (1) and (2).
+10 dB variation from
Ref.1
TP.52/TP.62 on dbx PCB:
+0.5 dB +1 dB varia-
tion from Ref. 1
TP.52/TP.62 on dbx PCB:
—2.8 dB +1 dB varia-
tion from Ref. 1
.
Decoding
level
FWD
record/
INR
system
LINE
IN:
OUTPUT:
:
setting
play
mode
our
1
kHz/—14.5
dB
Check
Note
the
off-the-tape-
Reference
2
TAPE SELEC- (146 mv) level
TOR:
ae
NR
system
LINE
IN:
ae
ay
OUTPUT:
:
a
+
MTT-5072
DBX
1
kHz/—14.5
dB
+1
dB
from
Ref.
2
FWD & REV
record/play modes
Measure the off-the-tape level :
veo
{TAPE
SELECTOR:
METAL
|
LINE
IN:
eee
ee
Tape:
MTT-5072
400
Hz/—12
dB
Check
.5%
or
less
ee
SELECTOR:
CrO2
|
(195
mV)
Tape:
MTT-5061
\ranee
SELECTOR:
NORMAL
Tape:
MTT-501
es
iri
eh
Ratio
of
26.
Signal-to-noise
1
kHz/—9
dB
OUTPUT:
TeHaous
"
:
put
ratio
Same
as
above
(275
mV)
Check
65
dB
min.
ratio
(—5
dB)
to
noise
:
No
signal
20