Adcom GFA-7700 ユーザーズマニュアル

The On/Off Switch controls power to the power transformer and circuits of the GFA-7700. Whenever 

the GFA-7700 is energized the Power LED (7) will glow. To turn the GFA-7700 on, press the push-button. 

It will remain in the “engaged” position while the unit is energized. To turn the GFA-7700 off, press the 

push-button in and release and it will move to the “disengaged” position.

This LED will glow whenever the On/Off Switch (6) is turned on and the GFA-7700 is energized. The 

Power LED indicates that there is AC voltage being fed to the amplifier, but it does not signify that all 

the amplifier’s circuits are in operation. If, for example, one of the Thermal Protection LED (9) glows, 

that amplifier channel will not produce sound even though the Power LED may still glow. When the 

GFA-7700 is turned off, the Power LED will take some time to fade out completely. It may take up to 30 

seconds to fully extinguish.

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 continually tripping the 

thermostat in the transformer, you must reduce the sound level demands, correct the load impedance 

of the loudspeakers, or both.

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