Yamaha n8 Service Manual page 86

n8/n12
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:
OUTPUT Distortion
ST OUT (LINE) 0.03 % or less
ST OUT (RCA) 0.03 % or less
AUX OUT
0.03 % or less
(n12 のみ )
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:
Measure output levels with no signal input. Check that the
noise levels are as follows:
ST OUT ST OUT
(LINE) (RCA)
Noise -90 or -88 or
Level less 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:
ST OUT (LINE)
INPUT
L R
+18 -60 or
CH A 1 *1
(output) less
-60 or +18
CH A 2 *2
less (output)
C-R OUT (n8)
C-R OUT A-C (n12)
INPUT
L R
+18 -60 or
CH A 1 *1
(output) less
-60 or +18
CH A 2 *2
less (output)
86
Unit: [dBu]
Off
Unit: [dBu]
C-R OUT (n8)
AUX OUT AUX
C-R OUT
(n12 only) PHONES PHONES
A-C (n12)
-86 or -90 or -90 or -90 or
less less less
Unit: [dBu]
AUX OUT
ST OUT (RCA)
(n12 only)
L R L
+6.2 -70 or +18
(output) less (output)
-70 or +6.2 -60 or
less (output) less (output)
C-R PHONES AUX PHONES
L R L
+7.1 -60 or +7.1
(output) less (output)
-60 or +7.1 -60 or
less (output) less (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:
AUX PHONES Volume:
INPUT
INPUT
LEVEL
CH A 1 +4
CH A 2 +4
C-R
less
R
-60 or
less
+18
R
-60 or
less
+7.1
C-R PHONES AUX PHONES
L R L
-80 or less – -80 or less
– -80 or less –
MIN
MIN
Unit: [dBu]
R
–
-80 or less