Operating the HCA-1200
Power Switch
Press once to tum the unit on. Press again to tum it off.
Level Controls
Adjust the gain of each channel independently. Many preamps have volume controls which do not track correclly to preserve channel balance at the lowest end of their rotation. By reducing the settings of the
Standby LED
This red LED will come on whenever you first tum the unit on. It will light for about four to five seconds while the circuit is stabilizing before the protection relays click on. It will also light up whenever there is a short circuit or fault which triggers the protection relays.
Operation LED
This green LED comes on after the protection relay click on. If the amp gets into trouble, the green operation light will extinguish, advising you no sound can be heard.
Overload LEDs
These LEDs will light up whenever the amplifier is pushed toward its clipping point. They are an indication that the amplifier is being overdriven and alert you to pending distortion. If you are driving speakers at a very high level, it is normal for these to flash occasionally on peaks in the program material.
High Temp LEDs
These will alert you to a pending thermal overload of the unit. If the amplifier is overdriven, as it builds up heat,
Protection Circuits
The
Fuses
The
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