Ashly LX-308B - Manual (Page 8)

8
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
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.
9. DIMENSIONS
Figure 9.1: Dimensional Drawing for LX-308B Mic/Line Mixer
0.10
6.00
17.00
1.
25
1.
75
1.15