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Operating Manual -MX-508 Stereo Microphone/Line Mixer

7.2 Installation of Input Transformers

The MX-508 is designed to accept optional plug-

in input isolation transformers with a minimum of tools

and no soldering. Instructions for installation are included

with the kit when you purchase an Ashly MX-508 ITC-

Kit (no. 40A5902)

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, either the problem is between the mixer and the later

components in the system, or else the Output Mute

switches are pressed. If there is no meter activity, check

to see you really have an input signal and that it is on the

desired channel, or check to see that the meter select switch

is set to Left/Right. Check that you have the master gain

controls at the desired operating level.

8.2 Distorted Sound

Something is being overdriven in the signal path.

If the clip indicators are active, reduce the channel gain

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

If the level meters are constantly in the red, reduce the

Master gain and increase the gain of components follow-

ing 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

9. DIMENSIONS:

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.

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. Check that

the Pad switch is not enabled unnecessarily. Turn up the

channel gain 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. Use bal-

anced input and output connections between widely sepa-

rated components.

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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