9
Fault
condition
SGL led L
= red
Temp led L
= red
SGL led R
= red
Temp led R
= red
What to do ?
Output signal
condition
Left amp
temp high
Yes
Reduce input
signal
limited output
power
Right amp
temp high
Yes
Reduce input
signal
limited output
power
Left amp
overheated
Yes
Yes
Reduce input
signal, wait for
cool down
output muted
Right amp
overheated
Yes
Yes
Reduce input
signal, wait for
cool down
output muted
Amp error
L (DC,
HF, short
circuit)
Yes
Yes
Remove error,
power off and
on
output muted
Amp error
R (DC,
HF, short
circuit)
Yes
Yes
Remove error,
power off and
on
output muted
Transformer
thermal
protection
Yes
Yes
Yes
Yes
Wait for cool
down*, power
off and on
output muted
*In case the transformer is overheated, it may take a few hours before the amplifier has cooled
down sufficiently. In such cases, you may have overloaded the amplifier too much. Power off the
amplifier immediately, correct the error and wait until the amplifier has cooled down.
Please note that in some cases, such as DC on the output, strong HF signals or short circuits, the
user must power off the amplifier. Remove the error condition and power on again.
Led status messages
Under normal circumstances, this amplifier will not overheat. If any of the above
mentioned overheating situations occur, please check the load impedance, the
ventilation and last but not least, input levels. The intelligent APC circuitry will
reduce input gain and level to a safe margin within certain limits. This circuitry can
not correct an input signal that is already clipped and distorted.
