Channel Equalizer Characteristics; Crosstalk; Peak Led Light-Up Level; Distortion Factor - Yamaha MG10/2 Service Manual

4.5 Channel Equalizer Characteristics

In the state checked in 4.2 above, check the output level obtained at ST L OUT in the case of CH INPUT and ST CH INPUT
L and at ST R OUT in the case of ST CH INPUT R when LO, HI and MID of INPUT are moved respectively.
Its level of each frequency shall be within the range specified in the table 4.5.1 compared to the output level obtained when
the EQ gain control is center click position.
If it is without the range, search the frequency, within the range of ±20%, of that the level is within the range of Table 4.5.1.
Table 4.5.1 [dB]
EQ control EQ GAIN
MAX
HI
MIN
MAX
MID
MIN
MAX
LO
MIN

4.6 Crosstalk

Setting the VR to the nominal position, and turning the PAN control (BAL control in the case of ST CH INPUT)
counterclockwise fully, the level of the leakage to ST R OUT shall be -50dBu or less when the output level of ST L OUT is
+20dBu.
Also turning the PAN control clockwise fully, the level of the leakage to ST L OUT shall be -50dBu or less when the output
level of ST R OUT is +20dBu.
In measuring the CH7 to CH10, the level of the leakage to ST OUT shall be -34dBu or less.

4.7 PEAK LED light-up level

In the state 4.1, each LED shall light-up when a signal specified as below is fed to the MIC input.
Table 4.7.1 [dBu]
INPUT PEAK LED
MIC -43±2
4.8 Meter LED lighting check
PEAK LED lights up, when ST output level reaches +17.5±2dBu.
0 LED lights up, when ST output level reaches +4±2dBu.
Operate the MASTER VR and check that LED light up in order from "-20" to "PEAK".

4.9 Distortion Factor

In the signal routes of the Table 4.2.1 to 4.2.6 indicated with q to ! 2 (except e, r), set the VR of INPUT and MASTER to
the Nominal Position, and set the GAIN to the position specified in the Table (except PHONES).
Then, feeding each 20Hz, 1kHz and 20kHz signal, the distortion shall be less than 0.1%, when the output signal level is
+14dBu.
At the C-R OUT (L/ R), setting the Level Control to the 12 o'clock position, feeding each 20Hz, 1kHz and 20kHz signal, the
distortion shall be less than 0.2%, when the output signal level is +3dBu.
In the route q, check every OUT when the signal is fed to CH1, and check only the ST L OUT when the signal is fed to
CH2 and other channels.
In the route w, turning the PAN/BAL control to L fully, the distortion shall be less than 0.1%, when the ST L OUT signal
level is +4dBu.
Applied frequency Variation width
+12±2
10kHz
-12±2
+15±2
2.5kHz
-15±2
+12±2
100Hz
-12±2
MG10/2
19