Ashly MX-206 Посібник з експлуатації - Сторінка 7

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Також для Ashly MX-206: Посібник з експлуатації (12 сторінок), Технічні примітки та специфікації (2 сторінок), Посібник з експлуатації (8 сторінок), Посібник з експлуатації (12 сторінок)

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7. TROUBLESHOOTING TIPS

7.1 No Sound

Check the AC power. Is the power switch on and

its LED lit? Check the level meters. If they are operating,

the problem is between the mixer and the later components

in the system. If there is no meter activity, check to see you

really have an input signal and that it is on the desired channel.

Check that you have the master gain controls at the desired

operating level.

7.2 Distorted Sound

Something is being overdriven in the signal path. If

the clip indicators are active, reduce the channel gain control

and/or press in the pad switch on the rear panel. If the output

level meters are constantly in the red, reduce the Master gain

and increase the gain of components following the mixer.

There are many gain adjustments in the mixer itself and prob-

ably several others in other system components which makes

it possible to overdrive an input section and then incorrectly

try to reduce the gain of the output section. The best way to

approach setting gains is to establish the operating level of

input stages first by setting their gain as high as possible but

leaving about 20dB of headroom for loud peaks, then move

on to set the master gain to produce a good meter reading.

Proceed to set the gain of equalizers, limiters, crossovers, and

amplifiers following the mixer in the same manner, always

working toward the later stages of the system.

7.3 Excessive Noise

If the noise is in the form of hiss, the problem is

usually due to an input stage set up for low gain and then

compensating by increasing the master gain. Check that the

Pad switch is not enabled unnecessarily. Turn up the channel

gain controls and reduce the master gain.

7.4 Excessive hum

This is usually caused by ground loops in the system

wiring. A complex sound system with many sources separated

by significant distance and using several power outlets has

many opportunities for this problem to occur. If possible,

feed everything in the system from one power source with a

common ground. Use balanced input and output connections

between widely separated components.

If you need help, get in touch with your Ashly dealer

or call an Ashly technical service representative at 1-800-828-

6308.

Operating Manual - MX-206 Stereo Microphone Mixer

8. SPECIFICATIONS

INPUT IMPEDANCE

Mic input (balanced) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 .2k Ohm

DISTORTION

THD at +20 dBu, 20Hz-20KHz, input switch at -40dB . . . <0 .05%

IMD (SMPTE) at +20dBu, input switch at -40dB . . . . . . . <0 .02%

HUM & NOISE (20Hz-20KHz)

equivalent input hum and noise (input switch -60dB) . . <-128dBu

residual output noise, TRS outputs,

all levels at minimum . . . . . . . . . . . . . . . . . . . . . . . . . . . <-100dBu

residual output noise, XLR outputs, . . . . . . . . . . . . . . . . . <-90dBu

Master Level at nominal,

all Ch . Level controls at min . . . . . . . . . . . . . . . . . . . . . . . <-84dBu

Master Level and one Ch . Level at nom . . . . . . . . . . . . . . <-80dBu

MAXIMUM VOLTAGE GAIN (±2dB)

Mic Input to Master Output, 600 ohm load . . . . . . . . . . . . . . . 84dB

Aux In to Master Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28dB

MAXIMUM INPUT LEVEL

Mic input (with pad) . . . . . . . . . . . . . . . . . . . . . . . . . . . . +22 .3dBu

MAXIMUM OUTPUT LEVEL

Transformer output . . . +24 .2dBu @600 Ohm (+26 .7dBu no load)

Line output . . . . . . . . . . . . . . . . . . . . . . . +23dBu, RCA +13 .5dBu

FREQUENCY RESPONSE

20Hz-20KHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0/-0 .5dB

CROSSTALK

Between any inputs or outputs

20Hz-20KHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <-60dB

VU METERS

Two 5-segment LED meters . . . . . . . . . . . . . . . . . . . 0VU = +4dBu

PEAK INDICATORS

Peak Clip indicator on each input channel and left and right outputs,

illuminates 3dB below clipping

PHANTOM POWER

+48 VDC applied to all Mic Inputs, switchable on front panel . Maxi-

mum total current draw = 80mA . Maximum single channel current

draw = 14mA . Gradual power-up and down to eliminate "pops" .

WEIGHT

unit weight . . . . . . . . . . . . . . . . . . . . . . . .6 .8 lbs . (3 .1kg) maximum

shipping weight . . . . . . . . . . . . . . . . . .10 .1 lbs . (4 .58kg) maximum

DIMENSIONS

19"W (48 .3) by 9 .4"D (23 .9) by 1 .75"H (4 .45)

POWER REQUIREMENTS

100-240 VAC, 50-60 Hz, 30 Watts

*unless otherwise stated, specification conditions are: 150Ω

source, Input set at "-40", all other controls set at nominal,

XLR output into 600Ω or greater.