AHB2 Instruction Manual Rev F Page 14
Fault Protection Circuitry
The AHB2 is designed to detect overloads, short circuits, clipping, excessive temperatures, high
DC offsets, and low AC input voltages. When a potentially-damaging fault occurs, the amplifier
enters a special "PROTECT" mode to prevent damage.
The amplifier has a comprehensive set of fault-detection circuits that will activate the PROTECT
mode to protect against damage to the amplifier or speakers.
Fault-Detection Circuits
Temperature sensor on each channel
Temperature sensor on main power supply
Current sensor on each output channel
Voltage clip detector on each output channel
DC offset detector on each output channel
SOA (safe operating area) detector on each output channel
Load sensor on main power supply
Fault sensors on all power supplies
AC line under-voltage fault sensor on AC input
PROTECT Mode (Both MUTE Lights On)
In PROTECT mode, both MUTE lights are on. The CLIP, TEMP, and POWER lights identify
the cause of the fault.
The PROTECT mode is only activated when a potentially damaging fault condition has occurred. To
protect against damage, both audio outputs are muted. In some fault conditions, all high-power
circuits are shut off. A small auxiliary power supply remains active so that the error condition can
be displayed on the front panel.
If the POWER light is flashing, all high-power circuits have been shut down as an additional
precaution.
If a fault has triggered the PROTECT mode, the amplifier must be turned off for at least
10 seconds before normal operation can resume. Identify and correct the cause of the
fault before restarting the amplifier.
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