ALESIS Matica 900 - Manual (Page 17)

In Case of Trouble
16 Matica 500/900 Reference Manual
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No Sound ¥Is the power switch on? If not, turn it on.
¥Is the power light on? If not, confirm that the amplifier
is plugged into a live AC mains circuit of appropriate
voltage and current capacity.
¥Check the circuit breaker and reset it if it is open. If the
breaker opens immediately, there may be a short
circuit across the output terminals; if not, there is a
possible internal fault in the amplifier which will
require service by a qualified technician.
¥Is the amplifier input connected to a live signal source?
Is the loudspeaker solidly connected to the amplifier
output at both ends of the speaker cable? Is the
speaker faulty?
¥Is the amplifier very hot? Is the ambient temperature
and/or the air flow in the rack abnormal? If so, the
amplifier may be in thermal protect mode; normal
operation will resume when its internal temperature
has dropped to reliable levels.
Weak or Distorted Signal ¥Is the signal source working correctly?
¥Is the wiring to the amplifier input properly connected
at both ends?
¥Have the gain controls of the signal source or the
amplifier been moved since the system was set up?