Yamaha n8 Service Manual page 84

n8/n12
1-2-4. Distortion factor (Input)
Set up as in descriptions marked q, e, t, u, o, !1 and
!3 in procedure 1-2-2. Then, adjust input level so that output
levels are as in the descriptions below: Check that the distortion
factor of outputs is as follows:
OUTPUT
OUTPUT
LEVEL
ST OUT (LINE) +4
· Turn off the ON switch of the input channels which are not
measured.
· Use 22 Hz HPF and 30 kHz LPF.
1-2-5. Equivalent input noise
Set up as in descriptions marked w, r, y, i and !3 in
procedure 1-2-2.
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)
-46 (EIN: -110)
CH A 1-8 (n12)
CH 5-8 (LINE) (n8)
-60 (EIN: -90)
CH 9-12 (LINE) (n12)
*1
2TR IN -74.2 (EIN: -86)
· 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 resistor to both the LINE input terminals
and RCA input terminals at the same time.
1-2-6. Crosstalk (Input)
Set up as in descriptions marked q, e, t, o and !3 in
procedure 1-2-2. Then, adjust input level so that output level is
as in the description below:
Unit: [dBu]
OUTPUT
OUTPUT
LEVEL
ST OUT (LINE) +4
84
Unit: [dBu]
Distortion
0.03 % or less
Unit: [dBu]
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 input CH 1-4 (n8)/CH 1-8 (n12).
*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
*2: Connect 150 Ω resistor to both the LINE input terminals
and RCA input terminals at the same time.
Measure output level of ST OUT (LINE). Check that the noise
levels are as follows:
INPUT ST OUT R (LINE)
MONO CH A 1,3 (n8)/
1,3,5,7 (n12)
ST CH 5,7 (n8)/
9,11 (n12) (LINE)
ST CH 5,7 (n8)/
9,11 (n12) (RCA)
2TR IN L
INPUT ST OUT L (LINE)
MONO CH A 2 (n8)/
2,4,6 (n12)
· Use 22 Hz HPF and 30 kHz LPF.
1-2-7. Talkback MIC (n12 only)
Direct buzzer sound toward microphone.
Check that signal is output from the AUX OUT.
1-2-8. Insert I/O
Set up as in descriptions marked w and r in procedure 1-2-2.
Insert a plug, which has wiring connection as in the following
fi gure, to the INSERT I/O connector of the input channel to be
measured.
Resistor
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)
CH 8 (n8)
Others
CH 12 (n12)
Others 2TR IN R
Unit: [dBu]
-75
-75
-75
-75
-75
*1
*2
*2