ALESIS Matica 900 - Manual (Page 18)

In Case Of Trouble
Matica 500/900 Reference Manual 17
Hum and/or Noise ¥Is the signal source working correctly?
¥Are the systemÕs electrical and audio ground connections
proper?
¥Are there any noise-producing sources on the AC mains
circuit, such as light dimmers, motors, etc.? If so, it
may be necessary to run a separate power line for the
audio equipment.
Thin or Muffled Sound ¥Are the loudspeakers all working properly, or are one or
more drivers defective?
¥In a multi-amplified system with a low level crossover
network, are all outputs from the network operating
properly? Are all loudspeakers properly connected?
¥Are both sides of a balanced input solidly connected? Is
the low side of the amplifier input connected to Audio
Ground with an unbalanced input connection?
Audio Cuts In and Out ¥Is the signal at the amplifier input terminals good?
¥Are all the input and output wires solidly connected?
¥If the sound cuts out for a minute or two and then returns,
is the amplifier overheating and cycling through
thermal protect mode? If so, check for short circuits in
the output wiring or excessive ambient temperature.
Channel B Shows Heavy
Clipping, Channel A is OK. ¥The two black output binding posts have been connected
together. These terminals are not at the same
potential and cannot be connected without special
wiring consideration. See page 10.