Troubleshooting; Front Panel Power Indicator Is Not Lit; No Sound; Protection Indicators Are Lit - Rotel RKB-250 Manuel D'utilisation

RKB-250 Power Amplifier

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
190 Watts
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
14
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.