Since the fuse has a ceramic body and you cannot visually examine the fuse element it is therefore suggested that you replace it with an identical substitute or bring the fuse to your ADCOM dealer so they may check its integrity. To replace the fuse, insert it in the back of the
(5) AC Power Cord
The AC cord provides power to operate all the GFA- 7605/7607’s circuits. Its plug can be connected to a standard wall outlet provided the outlet supplies a voltage compatible with the power requirements printed on the rear panel of the
DESCRIPTION OF UNIT: FRONT PANEL
(6) On/Off Switch
The On/Off Switch controls power to the power transformer and circuits of the
will glow. To turn the
(7) Power LED
This LED will glow whenever the On/Off Switch (6) is turned on and the
Additionally, the internal power transformer is provided with a thermostat which will interrupt power into the transformer if its temperature exceeds 125°C. This high temperature will seldom, if ever, be encountered unless the amplifier is subjected to abnormal conditions, such as operation into loads of less than 3 ohms at very high
listening levels, etc. If the AC Fuse (4) has not failed, the Power LED is out, and the Thermal Protection LED (9) does not glow, this would indicate that the thermostat within the transformer has opened.
Once the temperature within the transformer decreases to a normal level, the thermostat will reset itself automatically and normal operation will resume. If you are to avoid tripping the thermostat in the transformer continually, you must reduce the sound level demands, correct the load impedance of the loudspeakers, or both.
(8) Thermal Protection LEDs
The
if its heatsink temperature reaches 85°C. The Thermal Protection LEDs will light whenever the thermal protection circuit in its respective channel has been triggered and the amplifier is inoperative. The thermal protection circuitry will typically be triggered by very high power demands into impedances much lower than the amplifier is capable of driving at those levels. If any amplifier channel’s output through the loudspeaker(s) ceases abruptly, and its Thermal Protection LED glows, you will know that its heatsink temperature has become unacceptably high
and the circuitry is protecting the amplification devices. Please note that the Power LED (7) will remain on and the amplifier will still be energized. Once the temperature of the heatsink(s) drops to a safe operating level, that amplifier will automatically resume operation.
Activation of the Thermal Protection circuitry in any of the amplifiers in the
(9) Distortion Alert LEDs
The Distortion Alert circuit is a unique ADCOM distortion detection system which reads all forms of
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