Yamaha EMX512SC, Руководство по обслуживанию

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EMX512SC/EMX312SC
51
2-2 Indicator Inspection
Check the POWER indicator and DIGITAL EFFECT ON indicator light up when the unit is turned on. Also check that the fan is
rotating at a low speed.
2-3 Gain
With controls set as specified in the section 2-1, check the output levels are in the range specified in the table 2-3-1 and 2-3-2.
Notes:
• 0 dBu is referenced to 0.775 V
• The difference in the level between channels should be 2 dB or less.
2-4 Frequency Characteristic
In the signal route specified in the table 2-3-1 and 2-3-2, check the 20 Hz and 20 kHz frequency response of each output is within the
range of 0+1/–3 dB compared with the 1 kHz (0 dB).
2-5 Channel Equalizer Characteristics
With controls set as specified in the section 2-1, move each equalizer gain control (HIGH, MID, LOW) respectively and check the
output level obtained at MAIN OUT L for each frequency is within the range specified in the table 2-5-1 compared with the output
level obtained when each equalizer is at center click position.
If the output level is out of range, change the frequency input within the range of ±20 % and check the variation width specified in the
table 2-5-1 is obtained.
2-6 Graphic Equalizer Characteristics
With controls set as specified in the section 2-1, set each graphic equalizer fader at maximum or minimum and check the output level
obtained at MAIN OUT (L, R) and MONITOR OUT for each frequency is within the range specified in the table 2-6-1 compared with
the output level obtained when each graphic equalizer fader is at center click position.
If the output level is out of range, change the frequency input within the range of ±20 % and check the variation width specified in the
table 2-6-1 is obtained.
Table 2-3-1. CH INPUT (1-4)
Input LINE/MIC switch Input Level MAIN OUT (L, R) MONITOR OUT EFFECT OUT REC OUT (L, R)
1
INPUT A MIC –51 dBu +4±2 dBu
LINE –21 dBu +4±2 dBu
2
INPUT B MIC –61 dBu +4±2 dBu +4±2 dBu –6±2 dBu –8.5±2 dBu
LINE –31 dBu +4±2 dBu
Table 2-3-2. CH INPUT (5/6-11/12)
Input Input Level MAIN OUT (L, R) MONITOR OUT EFFECT OUT
3
MIC –61 dBu +4±2 dBu +7±2 dBu –3±2 dBu
4
LINE L –21 dBu +4±2 dBu
5
LINE R –21 dBu +4±2 dBu
Table 2-5-1
Equalizer control Equalizer Gain Input Frequency Variation Width
HIGH Max. 10 kHz +12±2 dB
Min. –12±2 dB
MID Max. 2.5 kHz +14±2 dB
Min. –14±2 dB
LOW Max. 100 Hz +12±2 dB
Min. –12±2 dB
Table 2-6-1
125 250 500 1k 2k 4k 8k
Input Frequency 125 Hz 250 Hz 500 Hz 1 kHz 2 kHz 4 kHz 8 kHz
Variation Width Max. +12±2 dB
Min. –12±2 dB