Rotel RKB-250 Troubleshooting, Specifications, Front Panel Power Indicator Is Not Lit, No Sound

RKB-250Power Amplifier 14

Troubleshooting

Most difficulties in audio systems are the result of poor or wrong connections, or improper control settings. If you encounter problems, isolate the area of the difficulty, check the control settings, determine the cause of the fault and make the necessary changes. If you are unable to get sound from the RKB-250, refer to the suggestions for the following conditions:

Front Panel Power Indicator Is Not Lit

No main power to the RKB-250. Check AC power connections at the amplifier and the AC outlet. Check the front panel power switch. Make sure that it is set to the ON position. If using signal sensing auto power-on, make sure that a signal is present at the inputs. If using 12V trigger power-on, make sure that a trigger signal is present at rear panel +12V connection.

No Sound

If the amp is getting AC power, but is pro- ducing no sound, check the PROTECTION INDICATORS on the front panel. If lit, see be- low. If not, check all of your connections and control settings on associated components. Make sure that your input connections and speaker connections match your selected stereo/mono configuration.

Protection Indicators are Lit

The front panel PROTECTION INDICATORS light when the RKB-250 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 protection devices. If the problem is not corrected or reoccurs, there is a problem with the system or the amplifier itself.

Specifications

Continuous Power Output into 8 ohms (20-20k Hz, < 0.03% THD)

50 watts/ch into 8 ohms, all channels driven

Continuous Power Output into 4 ohms (DIN 1 kHz,1.0% THD)

90 watts/ch into 4 ohms, all channels driven

Total Harmonic Distortion (20Hz-20kHz, 8 ohms) Continuous rated power: < 0.03% One-half rated power: < 0.03% 1 watt power: < 0.03%

Intermodulation Distortion (60 Hz : 7 kHz, 4:1)

< 0.03%

Damping Factor

(20-20,000 Hz, 8 ohms)

>200

Input Impedance

20 k Ohms

Input Sensitivity

1.0 volt

Amplifier Gain:

26 dB

Input Overload Level 5.0 volt

Peak Current

> 25 A

Frequency Response (±1 dB)

10Hz-100kHz

S/N Ratio (IHF A)

115 dB

Crosstalk/Separation

> 70 dB

Speaker Impedance

4 ohms minimum

Auto Turn On Level (with all inputs) 3 mV input signal

Power Requirements

USA: 120 Volts, 60 Hz

Europe: 230 Volts, 50 Hz

Power Consumption

190Watts Idle: 22 Watts Standby: 2.3 Watts

Dimensions (W x H x D)

(not including rack adaptors) 430 x 100 x 322 mm

16.9 x 3.9 x 12.7 in

Weight (net)

8 kg, 17.6 lb.

Panel Height

2U, 88.1 mm/3.5 in

When sizing openings in custom cabinets, mea- sure the unit to be installed and/or allow at least 1 mm clearance on all sides for unit to unit toler- ances.

All specifications are accurate at the time of print- ing. Rotel reserves the right to make improve- ments without notice.

Rotel and the Rotel HiFi logo are registered trade- marks of The Rotel Co, Ltd., Tokyo, Japan.