Stewart Audio AV30MX-2 - Manual (Page 8)

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3.2.1 Indicators
The AV30MX-2 has 4 rear panel LED indicators. The first is the power
indicator which will illuminate when power is supplied to the amplifier.
The next 2 LED indicators are the “Clip” indicators, one for each output
channel. These lights will indicate that one of the input signals is too
“hot” and will sound distorted when amplified. To fix this, the gain
should be reduced at the preamp or mixer level. The final light is the
signal present LED which will illuminate when signal is detected on
either one of the input connection channels.
3.2.2 Controls
All AV30MX-2 controls are located on the rear of the unit. There is no
power switch so the AV30MX-2 will turn on whenever power is sup-
plied to it. The AV30MX-2’s Signal Sense Technology (SST™) will
power up the amplifier from sleep when a signal is detected. After 5
minutes without an input signal the amplifier will go into sleep mode.
The rear panel contains a volume control for each input channel . The
amplifier is set to run off of a line-level source and the level should be
adjusted for optimum performance. To adjust this knob, you will need a
small flat-head screwdriver. While a typical program source level is
present, spin the rotary knob as far clockwise as you can without hear-
ing distortion or without the “Clip” indicator illuminating. If the signal is
distorting and the knob is all the way counter-clockwise, adjust the gain
down at the source level.
3.2.3 Remote Mute
The AV30MX-2 can be remotely muted when needed for such applica-
tions as muting during a fire alarm. To do so, 5-12VDC should be ap-
plied to the terminal block labeled “MUTE” on the rear of the AV30MX-
2. Polarity should be observed when connecting the triggering power
source as the amplifier will not be muted if polarity is reversed.
4 Troubleshooting
Problem: Power indicator does not turn on.
Procedure: Check that the amplifier is plugged into a live outlet. After
you have ensured that it is not a power issue, disconnect any speakers.
If the amplifier turns on after a few seconds delay, then the problem is
in the output connection. Check wiring and speakers for short circuits.
Problem: No output on one or both channels; Power indicator is
lit.
Procedure: Check that level controls are not turned down. Check that
input and output connections are secure. Ensure signal present LED is
flashing to denote a signal. If there is no signal detected check signal
source and that level controls are set high enough.
Problem: Amplifier overheats and/or shuts off.
Procedure: Review section 2.3 on proper cooling procedures. Check
the signal lights on the rear of the amplifier to see if the signal is over-
driving (the signal light flashes red frequently). Overdriving the amplifier
for extended periods of time can cause a thermal shutdown.
Problem: Output sound is distorted or cracking.
Procedure: Check all cables for damage or loose connections and re-
duce the gain on the input signal at the mixer or preamp level. Replace
the cables and loudspeakers temporarily to see if this resolves the
problem. If problem still exists, contact your Authorized Dealer for ser-
vice.