Rotel RMB-1080 Troubleshooting, Specifications, Speaker Connection, Fuse Replacement, No Sound

RB-1080Stereo Power Amplifier

Speaker Connection

The RB-1080 has two pairs of color coded binding posts on the back panel. These con- nectors accept bare wire, connector lugs, or dual banana type connectors (except in the European Community countries where their use is not permitted).

Route the wire from the RB-1080 to the speak- ers. Give yourself enough slack so you can move the components enough to allow access to the speaker connectors.

If you are using dual banana plugs, connect them to the wires and then plug into the backs of the binding posts. The hexagonal thumb- screws of the binding posts should be screwed in all the way (clockwise).

If you are using terminal lugs, connect them to the wires. If you are attaching bare wires directly to the binding posts, separate the wire conductors and strip back the insulation from the end of each conductor. Be careful not to cut into the wire strands. Unscrew (turn coun- terclockwise) the binding post hexagonal thumbscrews. Place the connector lug or wire around the binding post shaft. Turn the hex- agonal thumbscrews clockwise to clamp the connector lug or wire firmly in place.

Note: Be sure there are no loose wire strands that could touch adjacent wires or connectors.

8

Front Panel Power Indicator Is Not Lit

No main power to the RB-1080. Check the front panel power switch. Make sure that it is set to the on position. Check AC power con- nections at the amplifier and the AC outlet.

Fuse Replacement

If everything checks out correctly and you still cannot get the amplifier to turn on, check for a blown fuse. Disconnect the AC from the wall and remove the fuse holder on the back panel. If the fuse is blown, replace with a new fuse and try again.

Note: Make sure that the power cord is disconnected from the wall before checking or replacing the fuse. Replace only with the identical size and type fuse (3AG125V12A for U.S. version or 5ST6.3 for European version).

No Sound

If the amp is getting AC power, but is pro- ducing no sound, check the Protection indi- cator on the front panel. If it is lit, see below. If not, check all of your connections and control settings on associated components. Check the input selector switch on the RB-1080 back panel to be sure that its setting matches the type of input you are using.

Protection Indicator Is Lit

The front panel indicator lights when the RB-1080 protection circuits have shut off the amplifier. Typically, this occurs only when the ventilation openings are blocked, when there is faulty speaker wiring, or after a period of extreme use. Turn off the system and wait for the amp to cool. Then push the front panel power switch in and out to reset the protec- tion devices. If the problem is not corrected or reoccurs, there is a problem with the sys- tem or the amplifier itself.

Troubleshooting

Most difficulties in audio systems are the re- sult of poor or wrong connections, or improper control settings. If you encounter problems, isolate the area of the difficulty, check the con- trol settings, determine the cause of the fault and make the necessary changes. If you are unable to get sound from the RB-1080, refer to the suggestions for the following conditions:

Specifications

Continuous Power Output (20-20 kHz, < 0.03%)	200 watts/ch into 8 ohms
Total Harmonic Distortion (20Hz-20kHz, 8 ohms)	< 0.03%
Intermodulation Distortion (60 Hz : 7 kHz, 4:1)	< 0.03%
Frequency Response (+0.5 dB, -3 dB)	15Hz-100kHz
Damping Factor (20-20,000 Hz, 8 ohms)	1000
Speaker Impedance	4 ohms minimum
Signal to Noise Ratio (IHF A network)	116 dB
Input Impedance/Sensitivity	32 k Ohms/1.5 volt
Power Requirements	115 Volts, 60 Hz (U.S. version)
	230 Volts, 50 Hz (European version)
Power Consumption	550 Watts
Dimensions (W x H x D)	430 x 139 x 400 mm
	17 15/16 x 5 1/2 x 15 3/4 in
Weight (net)	16.8 kg, 37.03 lb.
All specifications are accurate at the time of printing.
Rotel reserves the right to make improvements without notice.