Yamaha N12 - n12 Digital Mixing Studio, Service Manual

Page: 86 / 245

n8/n12
86
1-3-5. Distortion factor (Output)
Set up as in description marked
!4
in procedure
1-3-2.
Check that distortion factors of outputs are as follows:
Unit: [dBu]
OUTPUT Distortion
ST OUT (LINE) 0.03 % or less
ST OUT (RCA) 0.03 % or less
AUX OUT
(n12 のみ )
0.03 % or less
C-R OUT (n8)
C-R OUT A-C (n12)
0.03 % or less
AUX PHONES 0.1 % or less
C-R PHONES 0.1 % or less
·
Use 22 Hz HPF and 30 kHz LPF.
1-3-6. Residual noise
Set up switches except ON switches as described in procedure
1-3-2.
Set up switches as follows.
ON SW of CH 1and 2: Off
Measure output levels with no signal input. Check that the
noise levels are as follows:
Unit: [dBu]
ST OUT
(LINE)
ST OUT
(RCA)
AUX OUT
(n12 only)
C-R OUT (n8)
C-R OUT
A-C (n12)
AUX
PHONES
C-R
PHONES
Noise
Level
-90 or
less
-88 or
less
-86 or
less
-90 or
less
-90 or
less
-90 or
less
·
Use 22 Hz HPF and 30 kHz LPF.
1-3-7. Crosstalk (Output L/R)
Set up switches except ON switches as described in procedure
1-3-2.
Adjust input level so that output levels are as in the following
descriptions:
Unit: [dBu]
INPUT
ST OUT (LINE) ST OUT (RCA)
AUX OUT
(n12 only)
L R L R L R
CH A 1 *1
+18
(output)
-60 or
less
+6.2
(output)
-70 or
less
+18
(output)
-60 or
less
CH A 2
*2
-60 or
less
+18
(output)
-70 or
less
+6.2
(output)
-60 or
less
+18
(output)
INPUT
C-R OUT (n8)
C-R OUT A-C (n12)
C-R PHONES AUX PHONES
L R L R L R
CH A 1 *1
+18
(output)
-60 or
less
+7.1
(output)
-60 or
less
+7.1
(output)
-60 or
less
CH A 2 *2
-60 or
less
+18
(output)
-60 or
less
+7.1
(output)
-60 or
less
+7.1
(output)
·
Use 22 Hz HPF and 30 kHz LPF.
*1:
Turn on the ON switch of CH 1 and turn off the ON
switch of CH 2.
Measure noise level at channel R of each output as
crosstalk level.
*2:
Turn off the ON switch of CH 1 and turn on the ON
switch of CH 2.
Measure noise level at channel L of each output as
crosstalk level.
1-3-8. PHONES Volume attenuation
Set up as in description marked
!4
in procedure
1-3-2.
Set up the controller as follows:
C-R PHONES Volume: MIN
AUX PHONES Volume: MIN
Unit: [dBu]
INPUT
INPUT
LEVEL
C-R PHONES AUX PHONES
L R L R
CH A 1 +4 -80 or less – -80 or less –
CH A 2 +4 – -80 or less – -80 or less