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Yamaha Audiogram 3 Service Manual Page 13

Usb audio interface.
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2-6
Gain
Check that the output level of each output terminal is within the range shown in the [Table 2-6.1] and [Table 2-6.2].
* Check that the difference in the level between channels is 2.0 dB or less.
Table 2-6.1 INPUT1 [dBu]
Input
INPUT
level
q
PHONE
-66.0
w
XLR
-22.0
e
-50.0
PHONE
(UNBAL)
r
-6.0
*1 Set the MIC/INST switch to ON (INST).
Table 2-6.2 INPUT2 [dBu]
INPUT
t
L
PHONE
(UNBAL)
y
R
u
L
PIN
i
R
2-7
Frequency characteristics
In the signal path of q to i in the [Table 2-6.1] and [Table 2-6.2], check that the output level of each output terminal is within
the range of +1.0/-3.0 dB compared with that of 1 kHz when the signal frequency is set to 20 Hz and 20 kHz.
(LEVEL control (GAIN control) : Minimum)
* Check that the frequency characteristics is within the range of +1.0/-4.5 dB when the signal frequency is set to 20 Hz and 20
kHz and the LEVEL control (GAIN control) is at maximum.
2-8
Crosstalk
Input signal from the INPUT2 L and check that the leakage level to the STEREO OUT R is -57.0 dBu or less when the output
level of the STEREO OUT L is +10.0 dBu.
Input signal from the INPUT2 R and check that the leakage level to the STEREO OUT L is -57.0 dBu or less when the output
level of the STEREO OUT R is +10.0 dBu.
* Set the LEVEL control of the INPUT1 and INPUT2 to minimum.
* Set the LEVEL control of the OUT to NOMINAL. (Direction of clock hand at 3 o'clock)
2-9
MASTER PEAK/SIGNAL indicator
Check that the MSTER PEAK/SIGNAL LED lights up when a signal within the range shown in the [Table 2-9.1] is fed to the input.
Table 2-9.1 [dBu]
INPUT
PEAK
1
-44.0 ± 2.0
2-10
Distortion
In the signal path of w, r, u and i of the [Table 2-6.1] and [Table 2-6.2], check that the distortion (T.H.D.) is 0.1% or less
when the output level of the STEREO OUT L, R is +8.0 dBu.
* Change the input signal frequency to "20 Hz", "1 kHz" and "20 kHz" and measure distortion (T.H.D.).
* Set the LEVEL controls of the channels which are not measured to minimum.
LEVEL
STEREO OUT L
control
(PHONE)
Maximum
-2.0 ± 2.0
Minimum
-3.0 ± 2.0
*1
Maximum
-2.0 ± 2.0
*1
Minimum
-2.0 ± 2.0
Input
LEVEL
STEREO OUT L
level
control
-2.0 ± 2.0
-40.0
Maximum
-2.0 ± 2.0
+4.0
Minimum
Input level
SIGNAL
-64.0 ± 2.0
STEREO OUT R
(PHONE)
-3.0 ± 2.0
STEREO OUT R
(PIN)
(PIN)
-2.0 ± 2.0
-2.0 ± 2.0
AUDIOGRAM3
PHONES L
PHONES R
-14.8 ± 2.0
-14.8 ± 2.0
13

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