Ashly DPX-200 Manual de instrucciones - Página 14

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1. Dimensions and Schematics

Operating Manual - DPX-200 Parametric Equalizer - Compressor/Limiter

10. BLOCK DIAGRAM

MIC

DPX-200 Block Diagram

INPUT

+ +

EQ Master In/Out

LINE

Mic

GAIN

4 BAND

INPUT

PARAMETRIC EQ

Line

(1)

(2)

Individual EQ Band In/Out

+ +

CHAIN

LIMITER

INPUT

GAIN

+ +

GAIN REDUCTION DISPLAY

RATIO

DETECTOR

ATTACK

RELEASE

11. Equalizer Troubleshooting Tips

No Audio Output

Check AC power - is the pilot light on?

Check in/out connections - are they reversed?

Are you sure you have an input signal?

Is the correct input selected?

Is the gain control turned all the way off?

EQ Controls Do Nothing

Is the individual filter or master EQ switch in?

Is the bandwidth set too narrow to be heard?

The lowest and highest frequency filters may be

beyond the range of the program material or speakers and

may produce little or no audible effect.

Peak Light Flashes or Stays On All the Time

If the peak light flashes, the signal level to the

equalizer is too high, or a particular filter is boosted too

much. Turn down the gain or switch the EQ filters. If it

is on all the time, disconnect the input and output cables.

If it is still on, the unit must be returned for service.

(3)

(4)

EQ OUTPUT

INPUT/OUTPUT METERS

VCA

OUTPUT

LEVEL

CHANNEL

IN/OUT

CIRCUIT

THRESHOLD

Distorted Sound

This will only be caused by too much signal

which will show on the Clip LED. If the LED is not

flashing, there is an overload within another product

CLIP

in the signal path. Adjust the relative gain of each

component in your chain to keep everything at a com-

fortable level.

Excessive Hum or Noise

Hum will usually be caused by a ground loop

between components. Try using the suggested bal-

anced input and output hook-ups if the other pieces

of equipment used in conjunction with your equal-

izer have balanced inputs and outputs.

CLIP

Noise (excessive hiss) can be caused by in-

sufficient drive signal. Make sure you are sending a

nominal 0 dBu line level signal to the equalizer. Most

noise problems occur because gain is applied to au-

dio signals too late in the chain. For best performance,

LIMITER

apply gain to individual source signals as early as

OUTPUT

possible, like at the mixer input preamp section. As

gain increases, it also boosts the noise content of that

signal. Any cumulative noise built up in a mixed sig-

DETECTOR

INSERT

nal will only be increased by using an equalizer as a

gain device, so make every attempt to operate the

equalizer with as little gain as possible.

Note: Unshielded cables, improperly wired con-

nectors, and cables with broken strands of wire are very

common problems. Use quality cables with quality, cor-

rectly wired connectors.

11.1 Compressor/Limiter Troubleshooting Tips

No Output

Check AC power. Is the power switch on? Check

input and output connections - are they reversed? Are

you sure you have an input signal?

Controls Have No Effect

Is the limiter in/out switch in? Perhaps the ratio

control is set too low to produce an audible effect or the

input level is below threshold. Is the threshold LED light-

ing up? If not, lower the threshold setting or increase the

gain. Do not expect to hear any effect when the input

level is below threshold, since the unit is simply a linear

amplifier at those levels.