Yamaha MLA8 Servise Manual page 24

MLA8
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2-13. Equivalent input Noise
An input terminal is short-circuited by 150
In the state of the Table 2-6
(equivalent input noise -128 dBu).
In the state of the Table 2-6
input noise -108 dBu).
"12.7 kHz Low path filter is used when carrying out noise measurement".
2-14. Phase
In the state 2-1 from 2-5, the phase of the input signal and the output signal shall be the same.
INPUT
Pin 1: GND
Pin 2: + (HOT)
Pin 3: - (COLD)
OUTPUT
D-sub 25-pin connectors
!3 !2 !1 !0
@5 @4 @3
NC G C H G C H
CH1 CH2
Euroblock connectors
TE
L 13942296513
+ - H + -
CH2 CH1
CH4 CH3
CH6 CH5
CH8 CH7
2-15. +48 V (PHANTOM)
Connect a 10 k
Ω
Turn on the +48 V switch and the voltage between pin 1 and 2 shall be within +35
2-16. Stability
Shunt the output terminal with the capacitance of 10 pF ~ 0. 1 F respectively. Then, the unit shall not oscillate.
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, The noise level obtained with an output terminal shall be less than -64 dBu.
w
, The noise level obtained with an output terminal shall be less than -88 dBu. (equivalent
o i u y t r e
@2 @1 @0 !9 !8 !7 !6
G C H G C H G C H G C H G C
CH3 CH4 CH5 CH6 CH7
H
load resistance between the pin 1 and 2 of the INPUT and short-circuit between the pin 2 and 3.
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!5 !4
G: GND
C: COLD
H G C H
H: HOT
CH8
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3 6 7 1 3
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2 9 9 4 2 8
1 5 0 5 8 2 9 9 4
± 3 V.
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2 8 9 9