Yamaha EMX 68S, Руководство по обслуживанию

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EMX68S / EMX88S
2.4 EQ Response Characteristic Check
On condition of 2.1, set the LOW, MID, HIGH controls according to the table 2.4-1, and mesure the output level of MAIN
OUTPUT.
Then confirm that output level variations from center click position meet the table 2.4-1.
When output level does not meet the table, change the input frequency until the output level meets the table.
If the frequency variation is within
±
20% of the rated value, the rusult can be regarded as OK.
Table 2.4-1 [unit: dB]
EQ VR Setting INPUT FREQUENCY RANGE OF VARIATION
HIGH
MAX
10kHz
+12
±
2
MIN -12
±
2
MID
MAX
2.5kHz
+14
±
2
MIN -14
±
2
LOW
MAX
100Hz
+12
±
2
MIN -12
±
2
2.5 GEQ Response Characteristic Check
On condition of 2.1, set the GEQ faders according to the table 2.5-1, and mesure the output levels of MAIN OUTPUT and
MONITOR OUTPUT.
Then confirm that output level variations from center click position meet the table 2.5-1.
When the output level does not meet the table, change the input frequency until the output level meets the table.
If the frequency variation is within
±
20% from the rated value, the result can be regarded as OK.
Table 2.5-1 [unit: dB]
125 250 500 1k 2k 4k 8k
INPUT FREQUENCY 125Hz 250Hz 500Hz 1KHz 2KHz 4KHz 8KHz
Variations
(for fader MAX) +12
±
2
(for fader MIN) -12
±
2
2.6 LED Meter Check
When the output level of MAIN OUT and MONITOR OUT meets the Table 2.6-1, confirm that the corresponding LED meter
starts to light up.
Table 2.6-1 [unit: dBs]
LED +6 +3 0 -5 -10
OUTPUT LEVEL +10
±
2 +7
±
2 +4
±
2 -1
±
2 -6
±
2.5
2.7 Distortion Rate Check
Set the INPUT and MASTER volume for each terminal of the table 2.2-1~2.2-4 to nominal position.
Then, confirm that the distortion rate is within 0.3% when the output level is +14dBs. (except REC OUT)
2.8 Maximum Output Level Check
On condition of 2.7, mesure the output levels of MAIN OUT, MONITOR OUT, EFFECT OUT.
Then, confirm that the output level of +20dBs can be gained with the distortion rate less than 1%.