Channel Equalizer Characteristics; Channel Separation; Channel Peak Indicator; Meter Indicator - Yamaha MG102c Service Manual

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2-9

Channel equalizer characteristics

Under 2-2 setting, check that the output level at the ST OUT L, R in each frequency when the HIGH, MID, and LOW
of EQ gain controls are moved respectively is within the range shown in Table 2-9-1 compared with the output level
when the EQ gain controls are at the center click position. If it is out of the range, change the input frequency within
the range of ±20% and check that the output level of the ST OUT L, R is within the range shown in Table 2-9-1.
* When the signal is input to CH1, CH2, CH7 L or CH9 L (MG102C), measure the output level at the ST OUT L.
* When the signal is input to CH3 L/MONO or CH5 L/MONO, measure the output level at the ST OUT L and ST OUT R.
* When the signal is input to CH8 R or CH10 R (MG102C), measure the output level at the ST OUT R.
Table 2-9-1
1, 2
3 L/MONO
PHONE 5 L/MONO
(LINE) 7 L, 8 R
9 L (MG102C),
10 R (MG102C)
* CH7/CH8 and CH9/CH10 (MG102C) have only HIGH and LOW controls.
2-10

Channel separation

Under 2-2 setting, turn the PAN (PAN/BAL, BAL) control counterclockwise fully and check that the leakage level to
the ST OUT R is –50.0 dBu or less when the output level at the ST OUT L is set to +20.0 dBu.
* Turn the PAN (PAN/BAL, BAL) controls of all the channels counterclockwise fully.
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* Set the "RETURN to ST level control" to Minimum.
* Turn the PAN (PAN/BAL, BAL) control clockwise fully and check that the leakage level to the ST OUT L is –50.0
dBu or less when the output level at the ST OUT R is set to +20.0 dBu.
* Turn the PAN (PAN/BAL, BAL) controls of all the channels clockwise fully.
* Set the "RETURN to ST level control" to Minimum.
2-11

Channel PEAK indicator

Under 2-2 setting, input the signal to the MIC INPUT and check that the input level at which the PEAK LED begins to
light is within the range shown in Table 2-11-1.
Table 2-11-1
INPUT
MIC
2-12

Meter indicator

Check that the PEAK LED lights up when the output level at the ST OUT L, R is set to +17.0 ± 2.0 dBu.
Check that the 0 LED lights up when the output level at the ST OUT L, R is set to +4.0 ± 2.0 dBu.
Check that the –20 LED lights up when the output level of the ST OUT L, R is set to –16.0 ±3.0 dBu.
Check that the LEDs from –20 to PEAK light up sequentially by operating the STEREO level control.
2-13 Distortion
For the signal paths q to !2 (excluding q, r, y and u) in Tables 2-6-1 to 2-6-6, check that the distortion is 0.1% or
less when the output level at each output except PHONES L, R is +14.0 dBu.
* Change the input signal frequency to 20 Hz, 1 kHz and 20 kHz, and measure the distortion.
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* Set the CH level controls other than the measurement channel to Minimum.
* For the signal path w, turn the PAN control counterclockwise fully and check that the distortion is 0.1% or less
when the output level at the ST OUT L is set to +4.0 dBu.
* For the signal path t, turn the PAN/BAL control clockwise and counterclockwise fully and check that the distortion
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is 0.1% or less when the output level at the ST OUT L, R is set to +4.0 dBu.
* For the signal path i, check all the outputs when the signal is input to CH7 L, and check only the ST OUT L when
the signal is input to CH9 L (MG102C).
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INPUT EQ gain control
Maximum
HIGH
Minimum
Maximum
MID
Minimum
Maximum
LOW
Minimum
PEAK LED
1 – 5/6 –43.0 dBu ± 2.0 dB
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i
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Variation
Input
Width
frequency
ST OUT (L, R)
+12.0 dB ± 2.0 dB
10 kHz
–12.0 dB ± 2.0 dB
+15.0 dB ± 2.0 dB
2.5 kHz
–15.0 dB ± 2.0 dB
+12.0 dB ± 2.0 dB
100 Hz
–12.0 dB ± 2.0 dB
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