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12-22.
Noise Suppress Check
Connection:
As shown in Fig. 12-31.
Switch Setting:
MONITOR
switch
..............c008. SOURCE
NOISE
SUPPRESS
switch .......... OFF
Procedures:
(1) Deliver a 9 kHz signal of -10 dB (0.24V) and
adjust
the
AUX
VOLUME
to obtain
0dB
(0.775V) on the VTVM.
(2)
Be
sure
that
the
VI'VM
reading
is -5.5~
-1.5dB
(0.41~0.65V)
when
the
NOISE
SUPPRESS
switch is changed to ON.
AF
OSC
REC Amp.
AUX
9 kHz, -10dB
LINE OUT
Fig. 12-31
Noise suppress check setup
12-23.
Interference Check
between
MIC & AUX
VOLUMES
Connection:
As shown
in Fig. 12-32.
Switch Setting:
MONITOR
switch ......ceeeeceeeeeeees SOURCE
Procedures:
A)
Interference
with
MIC
VOLUME
when
using
AUX
INput jack
(1) Set
the
AUX
VOLUME
tto the
position
indicated on page 25.
(2) Deliver
a
1 kHz
signal
of -10dB
(0.24V)
into the AUX
INput jack.
(3) Be sure
that
the level variation
is within
1 4B on the VTVM when the MIC VOLUME
is changed from
the minimum
to the maxi-
mum
position.
B)
Interference
with
AUX
VOLUME
when using
MIC jack
(1)
Set
the
MIC
VOLUME
tto
the
position
indicated on page 25.
(2)
Deliver a 1 kHz signal of -60 dB (0.775 mV)
into the MIC jack.
(3) Be sure
that
the
level variation
is within
2dB on the VTVM
when the AUX
VOLUME
is changed
from
minimum
to
maximum
position.
AF
oSC
REC
Amp.
eS
co
P.B. Amp.
AUX
-10dB
Mic.
-60dB
1kHz
x
Oo
LINE
OUT
Fig. 12-32
Interference check setup
between MIC & AUX
VOLUMES
12-24.
Minimum
Input Level Check
Connection:
As shown in Fig. 12-33.
Switch Setting:
MONITOR
switch ........ cee
ecco SOURCE
Procedures:
A)
Level Check of MIC jack
(1) Set the AUX
VOLUME
to minimum
and
the MIC
VOLUME
to maximum
position.
(2) Deliver
a 1 kHz
signal into the MIC jack
and adjust the level of the audio oscillator
to
obtain
OdB
(0.775V)
on
the
VTVM.
(3) Be sure that the signal level on the audio
oscillator is less than -72dB (0.2mV).
B)
Level Check of AUX
INput jack
(1) Set the
MIC
VOLUME
to minimum
and
the AUX
VOLUME
to maximum
position.
(2) Deliver a 1 kHz signal into the AUX INput
jack
and
adjust
the
level
of the
audio
oscillator
to obtain
O0dB
(0.775V)
on
the
VTVM.
REC Amp.
AF
ose
AUX,
MIC
1kHz
LINE OUT
OdB
Fig. 12-33
Minimum
input level check setup
—
38 —
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