Yamaha n8, Service Manual

Page: 116 / 245

n8/n12
116
2-1-4. Notice
If a result of test related to noise (distortion factor, equivalent
input noise, crosstalk, mute, residual noise, etc.) is NG, execute
factory set and then test again.
Refer to
“Service check program: 4. Factory set
procedure”
section for procedures of factory set. (Page 82)
2-2. Inspection
2-2-1. Gain (Input)
Set up switches, volumes and faders as follows:
PAN Volume of MONO Odd CH
(i.e. CH 1,3 (n8)/CH 1,3,5,7 (n12)):
L (Turned counterclockwise fully)
PAN Volume of MONO Even CH
(i.e. CH 2,4 (n8)/CH 2,4,6,8 (n12)):
R (Turned clockwise fully)
BAL Volume of CH 5-8 (n8)/CH 9-12 (n12):
Center
BAL Volume of STEREO BUS:
Center
all of CH Fader: Nominal (0 dB)
STEREO BUS Fader: Nominal (0 dB)
Unit: [dBu]
INPUT
INPUT
LEVEL
GAIN PAD
ST OUT
L R
INPUT A
1,3 (n8)
1,3,5,7 (n12)
-16 MIN
ON -22 ± 4 –
! q
OFF +4 ± 4 –
-60 MAX OFF +4 ± 4 *3 –
! w
INPUT A
2,4 (n8)
2,4,6,8 (n12)
-16 MIN
ON – -22 ± 4
! e
OFF – +4 ± 4
-60 MAX OFF – +4 ± 4 *3
!
r
ST CH LINE
5,7 (n8)
9,11 (n12)
*1
+4 MIN
–
+4 ± 4 –
! t
-26 MAX +4 ± 4 *3 –
! y
ST CH LINE
6,8 (n8)
10,12 (n12) *1
+4 MIN
–
– +4 ± 4
!
u
-26 MAX – +4 ± 4 *3
!
i
ST CH RCA
5,7 (n8)
9,11 (n12)
-7.8 *4 MIN
–
+4 ± 4 –
! o
-37.8 *4 MAX +4 ± 4 *3 –
! !0
ST CH RCA
6,8 (n8)
10,12 (n12)
-7.8
*4
MIN
–
– +4 ± 4
!
!1
-37.8 *4 MAX – +4 ± 4 *3
! !2
2TR IN L *2 -13.8 *4 – – +4 ± 4 *3 –
}
!
!3
2TR IN R *2 -13.8 *4 – – – +4 ± 4 *3
*1: Connect plugs at the same time for ST CH LINE L/R pair
connectors. (i.e. n8: 5(L) and 6(R), 7(L) and 8(R) / n12:
9(L) and 10(R), 11(L) and 12(R))
*2: Turn on the “2TR TO ST” switch and set its volume to
MAX.
*3: Check that level difference between channels are as
follows:
Tolerance
4 dB or less
*4: -7.8 dBu = -10 dBV, -13.8 dBu = -16 dBV,
-37.8 dBu = 40 dBV
2-2-2. Gain (Output)
Set up switches, volumes and faders as follows:
GAIN Volume of CH 1 and 2: MIN
PAD SW of CH 1 and 2: On
PAN Volume of CH 1: L (Turned counterclockwise fully)
PAN Volume of CH 2: R (Turned clockwise fully)
BAL Volume of STEREO BUS:
Center
Fader of CH 1 and 2: MAX
STEREO BUS Fader: MAX
AUX Volume of CH 1 and 2: MAX
AUX LEVEL Volume (n12 only): MAX
CONTROL ROOM LEVEL Volume: MAX
C-R SOURCE SELECT SW: AUX
C-R PHONES Volume: MAX
AUX PHONES Volume: MAX
Unit: [dBu]
INPUT
INPUT
LEVEL
AUX
PHONES
C-R OUT (n8)
C-R OUT A-C (n12) *1
C-R
PHONES
L R L R L R
CH A 1 +4 -6.9 ± 4 *3 – +4 ± 4 *2 – -6.9 ± 4 *3 –
}
!
!4
CH A 2 +4 – -6.9 ± 4 *3 – +4 ± 4 *2 – -6.9 ± 4 *3
INPUT
INPUT
LEVEL
ST OUT
(RCA)
L R
CH A 1
-2 (n8)
-10 (n12)
-7.8 ± 4
*3 *4
–
}
! !5
CH A 2
-2 (n8)
-10 (n12)
–
-7.8 ± 4
*3 *4
INPUT
INPUT
LEVEL
AUX OUT
(n12 only)
L R
CH A 1 -2 (n12) +4 ± 4
*2
–
}
! !6
CH A 2 -2 (n12) – +4 ± 4 *2
*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:
Check that level difference between channels are as
follows:
Tolerance
4 dB or less
*3: Check that level difference between L/R channels are as
follows:
Tolerance
4 dB or less
*4: -7.8 dBu = -10 dBV