Ashly LX-308 Bedieningshandleiding - Pagina 8

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Operating Manual - LX-308 Stereo Line/Microphone Mixer

8. TROUBLESHOOTING TIPS

8.1 No Sound

Check the AC power. Is the power switch on and

illuminated? Check the level meters. If they are operat-

ing, the problem between the mixer and the later compo-

nents in the system. If not, 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 op-

erating level.

8.2 Distorted Sound

Something is being overdriven in the signal path.

If the clip indicators are active, reduce the channel lev-

els. If the 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 sys-

tem 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

9. DIMENSIONS

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0.10

1.15

Figure 9.1: Dimensional Drawing for LX-308 Mic/Line Mixer

about 20dB of headroom for loud peaks, then move on to

set the master gain to produce a good meter reading. Pro-

ceed 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.

8.3 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. Turn up the

channel level controls and reduce the master gain.

8.4 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 sev-

eral power outlets has many opportunities for this prob-

lem to occur. If possible, feed everything in the system

from one power source with a common ground.

If you need help, get in touch with your Ashly

dealer or call an Ashly technical service representative at

1-800-828-6308 ext. 125.

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