User manual ROTEL RMB-1077

[. . . ] Connect the component to the power outlet only with the supplied power supply cable or an exact equivalent. Do not route the power cord where it will be crushed, pinched, bent at severe angles, exposed to heat, or damaged in any way. Pay particular attention to the power cord at the plug and where it exits the back of the unit. The power cord should be unplugged from the wall outlet if the unit is to be left unused for a long period of time. [. . . ] Opening the enclosure of the RMB-1077 exposes you to dangerous voltages. Consult a qualified technician or the Rotel factory service department for information. If you are going to be away from home for an extended period of time, it is a sensible precaution to unplug your amplifier. The RMB-1077 can be turned on and off automatically by using its "12V Trigger" system. The Turn On/Off Mode Selector switch is used to select which method is used. With the switch in the OFF position, the amplifier is turned on or off manually using the front panel power switch. Position, the amplifier is turned on automatically when a 12 volt trigger signal is applied to the 3. Turning the switch OFF cuts power to the amplifier, regardless of whether or not a trigger signal is present. Thermal and protection circuits protect the amplifier against potential damage in the event of extreme or faulty operating conditions. unlike many designs , the RMB-1077's protection circuit is independent of the audio signal and has no impact on sonic performance. Instead, the protection circuit monitors the temperature of the output devices and shuts down the amplifier if safe limits are exceeded. In addition, the RMB-1077 includes overcurrent protection which operates only when load impedances drop too low. Should a faulty condition arise, the amplifier will stop playing and the PROTECTION LED on the front panel will light. If this happens, turn the amplifier off, let it cool down for several minutes, and attempt to identify and correct the problem. When you turn the amplifier back on, the protection circuit will automatically reset and the PROTECTION LED should go out. In most cases, the protection circuitry activates because of a fault condition such as shorted speaker wires, or inadequate ventilation leading to an overheating condition. In very rare cases, highly reactive or extremely low impedance speaker loads could cause the protection circuit to engage. To use this feature the adjacent switch 5 must be set in the 12V TRIG position (see previous section). This input accepts any control signal (AC or DC) ranging from 3 volts to 30 volts. To turn the amplifier on (or to activate either of the optional automatic power-on modes), push the switch in. [. . . ] If using 12V trigger power-on, make sure that a trigger signal is present at rear panel 12V TRIG IN jack. If the amp is getting AC power, but is producing no sound, check the PROTECTION INDICATOR on the front panel. If not, check all of your connections and control settings on associated components. Make sure that your input connections and speaker connections match your system configuration. [. . . ]