Yamaha EMX62M, Service Manual

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30
EMX62M
2.2 Gain Check
On condition of 2.1, confirm that the output level of each terminal meets the table 2.2-1.
Table 2.2-1 [unit: dBs]
INPUT INPUT LEVEL MAIN OUT MONITOR OUT EFFECT OUT REC OUT PHONES OUT
-62
Low-Z -32 +4
±
2 +4
±
2 +4
±
2 -13.8
±
2 +3.4
±
2
(PAD ON)
Hi-Z -52 +4
±
2 - - - -
LINE -22 +4
±
2 - - - -
Super Hi-Z -42 +4
±
2 - - - -
AUX -22 +4
±
2 - - - -
2TR -22 +4
±
2 - - - -
2.3 Frequency Characteristic Check
At each terminal of the Table 2.2-1, confirm that the output level for 20Hz, 20kHz signal are 1, -3dB from the level for
1kHz signal.
2.4 EQ Response Characteristic Check
On condition of 2.1, set the LOW, HIGH controls according to the table 2.4-1, and mesure the output level of MAIN OUT and
MONITOR OUT.
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
LOW
MAX
100Hz
+12
±
2
MIN -12
±
2
2.5 GEQ Response Characteristic Check
On condition of 2.1, set the GEQ faders to MIN or MAX, and mesure the output levels of MAIN OUT and MONITOR OUT.
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