User manual ROTEL RB-880

[. . . ] If the unit is exposed to moisture, or a foreign object gets into the enclosure, immediately disconnect the power cord from the wall. Take the unit to a qualified service person for inspection and necessary repairs. Read all the instructions before connecting or operating the component. Keep this manual so you can refer to these safety instructions. [. . . ] Should you move your RB-951MkII to another country, it is possible to configure your amplifier for use on a different line voltage. Do not attempt to perform this conversion yourself. Opening the enclosure of the RB-951MkII exposes you to dangerous voltages. Consult a qualified technician or the Rotel factory service department for information. A pair of screw terminals for connecting the wires carrying a +12 volt trigger signal to turn the amplifier on and off, such as might be used in an elaborate custom installation. To use this feature the adjacent slide switch must be placed to the left position (see previous section). The TRIGGER INPUT accepts any control signal (AC or DC) ranging from 3 volts to 30 volts. The screw terminals are labeled "+ and ­" Observe proper polarity when connecting the trigger signal wiring. 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 power switch is located on the left side of the front panel. To turn the amplifier on (or to activate either of the optional automatic power-on modes), push the switch in. For Parallel Mono operation, either input may be used. Two recessed controls on the front panel, one for each channel, provide input level adjustments. These allow you to adjust the gain of the amplifier to match other components in an elaborate system. The CH 1 level control changes the gain of the left channel; the CH 2 level control changes the right channel. To adjust these controls, use a small, flat-blade screwdriver. For Stereo mode: Slide the switch to the right, use both input connectors, and connect one speaker to each pair of speaker connectors. the front panel LED will be extinguished. For Bridged Mono mode: Slide the switch to the left, use only the CH1 INPUT connection, and connect only one speaker to the two outer speaker connectors. The front panel LED will light to indicate Bridged Mono mode. These controls may be disabled by resetting an internal jumper. Two front panel LEDs (one for each channel) flash to indicate when the amplifier is "clipping" or being asked to deliver more output current than it is capable of delivering. [. . . ] WARNING: Removing the top cover of the amplifier to access the jumpers may expose you to potentially dangerous voltages. These settings should only be made by a qualified technician. Follow the labels printed below the connectors and make sure the BRIDGE switch is set to the BRIDGE MONO position. Most difficulties in audio systems are the result of poor or wrong connections, or improper control settings. [. . . ]