Yamaha N12 - n12 Digital Mixing Studio, Руководство по обслуживанию

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117
n8/n12
2-2-3. Frequency characteristics
Set up as in descriptions marked
w
,
r
,
y
,
i
,
!0
and
!2
through
!6
in procedures 2-2-1 and 2-2-2 .
Check that the levels of each output when the frequency is 20
Hz and 40 kHz are within the range shown below compared
with the level when the frequency is 1 kHz.
Tolerance
1/-3 dB
2-2-4. Distortion factor
Set up as in descriptions marked
q
,
e
,
t
,
u
,
o
,
!1
and
!3
through
!6
in procedures
2-2-1
and
2-2-2
.
Then, adjust input level so that output levels are as in the
descriptions below:
Check that the distortion factor of respective output is as
follows:
Unit: [dBu]
OUTPUT
OUTPUT
LEVEL
Distortion
ST OUT (LINE) +4 0.05 % or less
ST OUT (RCA) -7.8 *1 0.05 % or less
AUX OUT
(n12 only)
+4 0.05 % or less
C-R OUT (n8)
C-R OUT A-C (n12)
+4 0.05 % or less
AUX PHONES -6.9 0.2 % or less
C-R PHONES -6.9 0.2 % or less
·
Turn off the ON switch of the input channels which are not
measured.
·
Set the AUX Volume of the input channels which are not
measured to MIN.
·
Use 22 Hz HPF and 30 kHz LPF.
*1: -7.8 dBu = -10 dBV
2-2-5. Equivalent input noise
Set up as in descriptions marked
w
,
r
,
y
,
i
and
!3
in
procedure 2-2-1.
Connect 150 Ω resistor to the input terminals as follows:
INPUT CH A 1-4 (n8)/1-8 (n12):
Between 2 pin (Hot) and 3 pin (Cold)
INPUT CH 5-8 (LINE) (n8)/9-12 (LINE) (n12):
Between Tip and Sleeve
INPUT CH 5-8 (RCA) (n8)/9-12 (RCA) (n12):
Between Signal and GND
2TR IN: Between Signal and GND
Measure output level of ST OUT (LINE). Check that the noise
levels are as follows:
Unit: [dBu]
INPUT ST OUT (LINE)
CH A 1-4 (n8)
CH A 1-8 (n12)
-44 (EIN: -108)
CH 5-8 (LINE) (n8)
CH 9-12 (LINE) (n12) *1
-58 (EIN: -88)
2TR IN -66 (EIN: -84)
· Turn off the ON switch of the input channels which are not
measured.
· Use 22 Hz HPF and 30 kHz LPF.
*1:
Connect 150 Ω resistors to both the LINE input terminals
and RCA input terminals at the same time.
2-2-6. Residual noise
Set up switches, volumes and faders as follows:
ON SW of CH 1-8 (n8)/CH 1-12 (n12): Off
STEREO ON SW: Off
AUX Volume of CH 1-8 (n8)/CH 1-12 (n12): MIN
AUX PHONES Volume:
MAX
C-R PHONES Volume: MAX
AUX LEVEL Volume (n12 only): MIN
CONTROL ROOM LEVEL Volume: MIN
C-R SOURCE SELECT SW: AUX
ST OUT
(LINE)
ST OUT
(RCA)
AUX OUT
(n12 only)
C-R OUT (n8)
C-R OUT
A-C (n12) *1
AUX
PHONES
C-R
PHONES
Noise
Level
-88 -86 -84 -88 -88 -88
· Use 12.7 kHz -6 dB/oct LPF.
· Use 22 Hz HPF and 30 kHz LPF.
*1:
Turn on one of the corresponding switches for C-R
SPEAKER SELECT. (n12 only):
(For example, turn on switch “A” to inspect C-R A.)
2-2-7. Crosstalk (Input)
Set up as in descriptions marked
q
,
e
,
t
,
o
and
!3
in
procedure
2-2-1
.
Then, adjust input level so that output level is as in the
description below:
Unit: [dBu]
OUTPUT
OUTPUT
LEVEL
ST OUT (LINE) +4
Set up ON switches as follows:
Signal Input CH ON SW is On ON SW is Off Resistor *1
CH A 1 (n8/n12) CH 1 and 2 Others CH A 2
CH A 2 (n8/n12) CH 2 and 3 Others CH A 3
CH A 3 (n8/n12) CH 3 and 4 Others CH A 4
CH A 4 (n12) CH 4 and 5 Others CH A 5
CH A 5 (n12) CH 5 and 6 Others CH A 6
CH A 6 (n12) CH 6 and 7 Others CH A 7
CH A 7 (n12) CH 7 and 8 Others CH A 8
CH 5 (n8)/CH 9 (n12)
(LINE/RCA)
CH 5 and 6 (n8)
CH 9 and 10 (n12)
Others
CH 6 (n8)
CH 10 (n12) *2
CH 7 (n8)/CH 11 (n12)
(LINE/RCA)
CH 7 and 8 (n8)
CH 11 and 12 (n12)
Others
CH 8 (n8)
CH 12 (n12) *2
2TR IN L 2TR IN L and R Others 2TR IN R
· Turn on the PAD switch of CH 1-4 (n8)/CH 1-8 (n12).