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and the AC RAIL FUSES, please refer to their respective sections.
INSTANTANEOUS DISTORTION ALERT LEDs
The INSTANTANEOUS DISTORTION ALERT circuit is a unique ADCOM
distortion-detection system which reads all forms of non-linear distortion such as THD, IM,
slew-induced, "clipping", etc. The INSTANTANEOUS DISTORTION ALERT LEDs will light
when distortion reaches 1% regardless of the impedance or the phase angle of the current
voltage and the reactance of the loudspeakers which the amplifier is driving. Sometimes,
when the amplifier is in use, the LEDs may occasionally flicker under high-volume listening,
particularly if you are driving low impedances. This flickering is no cause for concern. The
LEDs are simply warning you that the amplifier is approaching its maximum power output
into the specific loudspeakers which you are using. If, however, the INSTANTANEOUS
DISTORTION ALERT LEDs glow brightly or are on most of the time during playback, you
are overdriving the amplifier and should lower the volume control to reduce the
listening-level demands, or you may blow the AC RAIL FUSES, cause the THERMAL
PROTECTION to be activated or, in extreme cases, damage your loudspeakers.
THE LIMIT PROTECTION LED
There are two statuses for the LIMIT PROTECTION LED.
Firstly when power on the amplifier, the Limit protection LED will light 8 +/-2 seconds and
then go out, it means the amplifier is no output during these period time, you also can hear
both left & right channel output relay on and go into the operation mode.
Secondly the GFA-575se is provided with an overload protection circuit to protect amplifier
when speaker short circuit or DC voltage is happened on the amplifier output stage, the
LIMIT PROTECTION LED will light.
It means the output relay will open immediately to prevent the output transistor or other parts
from failing.
THERMAL PROTECTION LED
The GFA-575se is provided with a thermal protection circuit which will shut down the
amplifier if the temperature of either heatsinks reaches 70°C. The THERMAL PROTECTION
LED will light whenever the thermal protection circuit on either channel, or both channels,
has been triggered and the amplifier is inoperative. You will know that its heatsinks
temperature has become unacceptably high and the circuitry is protecting the amplification
devices. Please note that the POWER LED will remain on and the amplifier will still be
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