Alesis RA500 User Manual - Page 30

Troubleshooting: Chapter 4 Symptom Audio cuts in and out Unit shuts down, all lamps are off Thin or Muffled Sound Cause Solution Intermittent amplifier input signal Clean input connectors, check wiring If the sound cuts out for a minute or two and then returns, the amplifier may be overheating and cycling through thermal protect mode Check for short circuits in the output wiring or excessive ambient temperature Dirty volume pot Move volume pot up and down several times Blown fuse Obtain the proper size fuse (see page 10) and replace it Internal thermal fuse activated Shut off power and let amplifier cool down Defective loudspeaker drivers Replace drivers In a multi-amplified system with a low level crossover network, bad outputs from the network, or improperly connected loudspeakers Balanced connector with one side disconnected, or no ground with an unbalanced input Check crossover and connections. Check speaker connections. Make sure input cables are connected to ground as required CARE AND MAINTENANCE CLEANING Disconnect the AC cord, then use a damp cloth to clean the RA150/300/500's metal and plastic surfaces. For heavy dirt, use a non-abrasive household cleaner such as Formula 409™ or Fantastik™. DO NOT SPRAY THE CLEANER DIRECTLY ONTO THE FRONT OF THE UNIT AS IT MAY DESTROY THE LUBRICANTS USED IN THE SWITCHES AND CONTROLS! Spray onto a cloth, then use cloth to clean the unit. REFER ALL SERVICING TO ALESIS We believe that the RA150/300/500 is one of the best amplifiers that can be made using current technology, and should provide years of troublefree use. However, should problems occur, DO NOT attempt to service the unit yourself. Service on this product should be performed only by qualified technicians. NO USER-SERVICEABLE PARTS INSIDE. 28 RA150/300/500 Reference Manual