Ashly LX-308B Manuel d'utilisation - Page 8

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1. Connections and Cables

Operating Manual - LX-308B 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 level

controls. If the clip indicators are still active, reduce the

input signal level. If the 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 probably several oth-

ers 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

9. DIMENSIONS

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

of input stages first by setting their gain as high as pos-

sible 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, lim-

iters, 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.