AHB2
Instruction Manual Rev F
Page 20
Power Supply Fault
The power supply has a number of sensors that monitor voltage, current, and temperature. If any
parameter exceeds safe limits, both channels are muted to protect the amplifier and speakers. This
fault may indicate that the AC power has been interrupted. It may also indicate that the power
supply has overheated. It may also indicate the detection of an overload on one of the power
supply rails. It may also indicate a fault condition in the power supply system. All high-power
subsystems are shut down. A power reset will be required.
Fault Display:
POWER
light is Flashing
Both
CLIP
lights are On
Both
TEMP
lights are On
Both
MUTE
lights are On
This fault display will only persist if AC is present.
In the event of a total loss of AC power, this error display will stay on for about 15-30
seconds and then all lights will turn off.
Typical Causes:
The AC line voltage may have dropped below allowable limits for a few seconds
AC power has been lost (if all lights turn off after about 15-30 seconds)
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:
Check the AC power source
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
If unit is hot, allow time to cool
Turn down the audio source
Restart the amplifier