Ashly MX-206 Panduan Pengoperasian - Halaman 7

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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 compo-

nents 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 fol-

lowing the mixer. There are many gain adjustments in the

mixer itself and probably several others in other system

components which makes it possible to overdrive an in-

put 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 ampli-

fiers following the mixer in the same manner, always work-

ing 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 sys-

tem 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.

8. SPECIFICATIONS

DISTORTION

THD at +20 dBu, 20Hz-20KHz, input switch at -40dB <0.05%

IMD (SMPTE) at +20dBu, input switch at -40dB . . . . <0.02%

Operating Manual - MX-206 Stereo Microphone Mixer

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

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 out-

puts, illuminates 3dB below clipping

PHANTOM POWER

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

Maximum total current draw = 80mA. Maximum single channel

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

"pops".

SHIPPING WEIGHT

13 lbs. (5.9kg) 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:

150 Ω source, Input set at "-40", all other controls set at

nominal, XLR output into 600 Ω or greater.