Yamaha n8 Service Manual page 117

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
Within +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:
OUTPUT
OUTPUT
LEVEL
ST OUT (LINE) +4
ST OUT (RCA) -7.8
*1
AUX OUT
+4
(n12 only)
C-R OUT (n8)
+4
C-R OUT A-C (n12)
AUX PHONES -6.9
C-R PHONES -6.9
· 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:
INPUT ST OUT (LINE)
CH A 1-4 (n8)
-44 (EIN: -108)
CH A 1-8 (n12)
CH 5-8 (LINE) (n8)
-58 (EIN: -88)
CH 9-12 (LINE) (n12)
*1
2TR IN -66 (EIN: -84)
Unit: [dBu]
Distortion
0.05 % or less
0.05 % or less
0.05 % or less
0.05 % or less
0.2 % or less
0.2 % or less
Unit: [dBu]
· 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):
STEREO ON SW:
AUX Volume of CH 1-8 (n8)/CH 1-12 (n12): MIN
AUX PHONES Volume:
C-R PHONES Volume:
AUX LEVEL Volume (n12 only):
CONTROL ROOM LEVEL Volume:
C-R SOURCE SELECT SW:
ST OUT ST OUT AUX OUT
(LINE) (RCA) (n12 only)
Noise
-88 -86 -84
Level
· 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
CH A 1 (n8/n12) CH 1 and 2
CH A 2 (n8/n12) CH 2 and 3
CH A 3 (n8/n12) CH 3 and 4
CH A 4 (n12) CH 4 and 5
CH A 5 (n12) CH 5 and 6
CH A 6 (n12) CH 6 and 7
CH A 7 (n12) CH 7 and 8
CH 5 (n8)/CH 9 (n12) CH 5 and 6 (n8)
(LINE/RCA) CH 9 and 10 (n12)
CH 7 (n8)/CH 11 (n12) CH 7 and 8 (n8)
(LINE/RCA) CH 11 and 12 (n12)
2TR IN L 2TR IN L and R
· Turn on the PAD switch of CH 1-4 (n8)/CH 1-8 (n12).
n8/n12
Off
Off
MAX
MAX
MIN
MIN
AUX
C-R OUT (n8)
AUX C-R
C-R OUT
PHONES PHONES
A-C (n12)
*1
-88 -88 -88
Resistor *1
Others CH A 2
Others CH A 3
Others CH A 4
Others CH A 5
Others CH A 6
Others CH A 7
Others CH A 8
CH 6 (n8)
Others
CH 10 (n12)
*2
CH 8 (n8)
Others
CH 12 (n12)
*2
Others 2TR IN R
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