Benchmark AHB2 - Over-Temperature Fault Diagnosis

AHB2 Instruction Manual Rev F Page 19
Over-Temperature Fault
The temperature of the left and right heat sinks are constantly monitored. If either heat sink
reaches the maximum allowable temperature, both channels are muted to protect the amplifier and
speakers. All high-power subsystems are shut down to accelerate the cooling process. One or both
heat sinks will be very hot. After the unit cools, a power reset will be required.
Fault Display:
 POWER light is Flashing
 Both CLIP lights are Off
 One TEMP light is On
 Both MUTE lights are On
Typical Causes:
 The load impedance of the speakers may be too low
 Heat sinks may be obstructed
 Amplifier has been overloaded with a high-amplitude test tone
Required Actions:
 Make sure the nominal STEREO load impedance is 3 Ohms or higher
 Make sure the nominal Bridged MONO load impedance is 6 Ohms or higher
 Maintain adequate clearance around heat sinks
 Allow time for the amplifier to cool
 Turn down the audio source
 Restart the amplifier