Ashly LX-308B Operating Manual page 9

Operator Manual – LX-308B Mixer
Situation
No Sound
Distorted Sound
Excessive Noise
Excessive Hum or Noise
Note: Unshielded cables, improperly wired connections, and cable with broken strands are
the most common problems. Make sure you use good quality cable with connectors
soldered firmly on the correct pin. When in doubt, get in touch with your Ashly dealer.
In Inches
Action
Check the AC power. Is the power switch on and illuminated? Check the level meters. If they
are operating, 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.
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 others 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 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 amplifiers following the mixer in the same manner,
always working toward the later stages of the system.
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.
This is usually caused by "ground loops" in the system 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.
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Page - 9
Safety Instructions – 3
Introduction - 4
LX-308B Mixer – 5
Connectors & Cables – 5
Physical Description - 6
Installation – 7
Typical Applications - 8
Troubleshooting - 9
Dimensions - 9
Specifications - 10
Warranty - 11