Sony TA-2000F - Sensitivity Measurement

3-3.
OVERALL
CHECK
PREPARATION
Unless
otherwise
specified,
set
all
controls
and
switches
as
follows
to
prepare
for
the
following
checks:
VOLUME control .............. maximum position
MODE switch ...............0+ STEREO
MONITOR
switch
..............
SOURCE
MIC
LEVEL
control
........
MIXING
OFF
FILTER switch ........0..0. OFF
TREBLE control ............. 0 (dB)
BASS control wo... 0 (dB)
TONE switch oe CANCEL
TREBLE TURNOVER
FREQ. switch ........... 2.5 kHz
BASS TURNOVER
FREQ.
switch
............
$00
Hz
METER LEVEL switch ..... 0 (dB)
HEADPHONE LEVEL
(lose
A
0)
re
minimum
level
BALANCE
control
............
mid
position
LEVEL
ADJUST
control
..
maximum
level
(rear panel)
OUTPUT LEVEL switch... 1V
(rear panel)
IMPEDANCE
SELECTOR switch......:. 47k
(rear panel)
TA-2000F
Set the BALANCE control to fully counter-
clockwise (left-channel measurement) or fully
clockwise (right-channel measurement) posi-
tion.
Procedure — Perform this for each input
1.
With the equipment connected as shown in
Fig. 3-4, feed a 1 kHz signal to the input jack.
Adjust the attenuator to obtain a | volt reading
on the ac VTVM. Note that the audio
oscillator’s output should always be kept at
0.775 volts (0 dB).
The reading of the attenuator represents the
input sensitivity and should within the limits
given in Table 3-1.
TABLE 3-1. INPUT SENSITIVITY
SPECIFIED SENSITIVITY
AT 1kHz
INPUTS
PHONO-1 (HIGH LEVEL)
-57 +1dB
*(LOW LEVEL) -82.2 £1.5 dB
MIC
PHONO-2
TUNER, AUX-1, -2, -3 -17.5. £0.5 dB
-57 +1dB
-63.7 $1.5 dB
*
The
PHONO-1
IMPEDANCE
SELECTOR
switch
should
be
set
to
30.9
and
an
additional
attenuator
pad
(See
Fig.
3-1.) used between the main attenuator and input jack.
ees fy
3-5.
LEVEL
METER
(VU
meter)
CALIBRATION
34.
SENSITIVITY
MEASUREMENT
(
;
Preparation
Preparation
:
:
1.
Set
the
FUNCTION-2
switch
to
TUNER.
Set
all
the
controls
as
described
in
Procedure
3-3.
2.
Set
the
BALANCE
control
fully
counterclock-
wise
(left-channel
calibration)
or
fully
clock-
Set
the
FUNCTION-1,
IMPEDANCE
SELEC-
;
;
;
i
:
wise
(right-channel
calibration).
TOR,
and
FUNCTION-2
switches
to
the
position
where
the
measurement
should
be
3.
Set
the
METER
LEVEL
switch
to
OdB.
performed.
ac
VT
VM
or
oscilloscope
distortion
meter
0.775
V
constant
6002.
unbalanced
TA-2000F
(7.
eA
600
2
audio
t
;
out
oiciliator
|
attenuator
|
inoue
put
|
V
|
|
fa
Pace
ee
ss
Fig.
3-4.
Level
check
test
setup