Residual Noise; Phase; Phantom; Digital Effect - Yamaha MG24/14FX Service Manual

4.13 Residual Noise

In the state 4.1, set the all Fader and Level Controls of each input CH to MIN and set the all Assign switch and CH ON
switch to OFF.
Then, the noise level shall be less than the level specified in the Table 4.13-1.
Table 4.13-1 [dBu]
Fader/VR ST L/R OUT MONO OUT
MAX -74
MIN -99

4.14 Phase

In the state 4.1, the phase of the input signal and the output signal shall be the same.

4.15 PHANTOM

Connect a 10kohms load resistance between the pin 1 and 2 of the INPUT A and short-circuit between the pin 2 and 3.
Turn on the PHANTOM switch (LED shall light) and the voltage between pin 1 and 2 shall be within +35 +/-3V.
4.16 LAMP
Connect a 30ohms load resistance between the pin 2 and 3 of the LAMP(12V) connector. The voltage between pin 2 and
3 shall be within 10.7 +/-1VAC.

4.17 DIGITAL EFFECT

Set the CH1 & MASTER as follows and feed -46dBu signal to CH1 MIC.
* CH1
* MASTER
The output levels shall be within the range specified in the Table 4.17-1~3.
In the state that showed in Table 4.17-1, TAP LED shall flash on and off.
Tap the TAP switch several times and check the interval that TAP LED blinks changes.
Connect a foot switch equivalent to FC5 or it to FOOT SWITCH input jack on rear panel. Tap the foot switch several times
and check the interval that TAP LED blinks changes.
Table 4.17-1
EFF RTN1, 2 EFF RTN1, 2
PARAMETER AUX1-4
MIN MAN
Table 4.17-2
EFF RTN1, 2 EFF RTN1, 2
1-2, 3-4 ST PARAMETER
ON MIN
Table 4.17-3
EFF RTN1, 2 EFF RTN1, 2
PFL PARAMETER
ON MIN
4.18 Stability
Shunt the output terminal with the capacitance of 10pF-0.1microF respectively. Then, the unit shall not oscillate.
Shunt the all input terminals with 150 ohms, and set the all VR and EQ Control to MAX. Then, the unit shall not oscillate.
4.19 Primary Voltage Tolerance
The unit shall work normally with the primary voltage of +/-10%.
GROUP1-4 OUT
-73 -77
-99 -100
GAIN VR: MIN, PAD: OFF, Fader, EFF1-2: MAX
SEND EFF1-2: MAX
EFF RTN1 EFF RTN2
PROGRAM PROGRAM
8 –
– 16
EFF RTN1, 2 GROUP, ST
fader fader
MAN MAN
EFF RTN1 EFF RTN2
PROGRAM PROGRAM
8 –
– 16
AUX1-6 OUT EFFECT1-2 OUT PHONES OUT ST SUB OUT
-72 -76
-100 -100
EFF RTN1 EFF RTN2
AUX1-4 OUT
ON SW ON SW
+5.0 ±3
ON OFF
+5.0 ±3
OFF ON
EFF RTN1 EFF RTN2 EFF RTN1
PROGRAM PROGRAM ON SW
8 –
– 16
EFF RTN1 EFF RTN2
PHONES OUT
ON SW ON SW
-4.5 ±3
ON OFF
-4.5 ±3
OFF ON
-80
-100 -100
EFF RTN2 GROUP
ON SW 1-4 OUT
+10.5 ±3
ON OFF
+10.5 ±3
OFF ON
MG24/14FX
MG24/14FX
-78
ST
+10.5 ±3
+10.5 ±3
71