Yamaha EMX 68S, Руководство по обслуживанию

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37
EMX68S / EMX88S
INSPECTIONS
0. PREPARATION
(1) Mesuring instruments
•
Oscillator (Ballance output type, Output impedance 150
Ω
)
•
Oscilloscope (Input impedance 100k
Ω
)
•
Level meter (Input impedance 100k
Ω
)
•
Distortion Meter
(2) Notes for mesuring
•
Noise level must be mesured by using DIN AUDIO FILTER.
•
0dB is equal to 0.775V.
1. Power Indicator and Fan Check
Confirm that the power indicator LED lights up while the power is ON.
Besides, confirm that the fan is rotating at low speed.
2. Mixer Check
2.1 Preparation
•
Except otherwise indicated, proceed as follows.
Input signal must be 1kHz sine curve.
Output impedance of signal source must be 150
Ω
.
Connect the load of 10k
Ω
to each output terminal.
•
Set each control as follows.
CH INPUT (1-4: EMX68S / 1-6: EMX88S)
EQ (HIGH, MID, LOW) level control: CENTER
MONITOR level control: MAX
EFFECT level control: MAX
PAN: CENTER
LEVEL control: MAX
PAD switch: OFF
ST CH INPUT (5-6: EMX68S / 7-8: EMX88S)
EQ (HIGH, MID, LOW) level control: CENTER
MONITOR level control: MAX
EFFECT level control: MAX
BAL/PAN: CENTER
LEVEL control: MAX
DIGITAL EFFECT
PROGRAM select switch: 16
PARAMETER control: MIN
DIGITAL EFFECT ON switch: OFF
TAP switch: OFF
MAIN(L, R)
GRAPHIC EQUALIZER (7 band) fader: CENTER
EFFECT RTN level control: MAX
AUX IN: MAX
2TR IN: MAX
MASTER level control: MAX