Operation; Protective Circuits; Problem Chart - Omnitronic PAP Series User Manual

7

OPERATION

1. To prevent loud switching noise, always switch on all other units of the amplifier system before switching
on the power amplifier. After operation, switch off the power amplifier first.
2. Prior to switching on set the level control to zero. Then switch on the amplifier with the power switch. The
power indicator lights up.
3. Adjust the level control to the desired volume value. In case of overload, the red LED CLIP lights up. In
this case, reduce the volume correspondingly.
Notes
• When operating the amplifying system, please make sure that the loudspeakers always sound well. When
distortions can be heard, either the amplifier or the loudspeaker is overloaded. Overloads can quickly lead to
amplifier or speaker damage. In order to avoid damage, please reduce the volume immediately when distortions
can be heard.
• When speaker systems are destroyed by overload, the guarantee becomes void. Always check the sound
pressure level with a meter in order to keep to the threshold.

Protective circuits

The protective circuits prevent damage to the speakers and the amplifier. If activated, the speakers are
electrically separated from the amplifier and the LED FAULT lights up:
• for a few seconds after switching-on until the speaker outputs are ready for operation
• in case of overheating of the amplifier
• in case of a short-circuit at a speaker output
• in case of a DC voltage at a speaker output
If the red LED FAULT lights up during operation or if it does not extinguish after switching on, the amplifier
has to be switched off and the cause of the fault has to be removed.
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8

PROBLEM CHART

PROBLEM
No power.
No sound.
Fan does not work, LEDs do
not light up.
LED FAULT lights up
permanently.
CAUSE
The power cord is not connected.
•
The power cord of the respective device
•
is not connected properly or not
connected at all or is defective.
The connection socket or the plug is
•
dirty.
The power cord is not connected.
•
Inputs receive DC voltage.
•
Amplifier is overheated due to impurities
•
or heat accumulation.
Impedance of speakers too low.
•
Short-circuit in speaker connection or in
•
speakers.
Technical default of amplifier.
•
21
REMEDY
Check the power cord and any
•
extension cables.
Check the power cord and if the plugs
•
are tightly connected with the sockets.
Clean the socket and/or the plug.
•
Please check if the power is available
•
Switch amplifier off and have the device
•
checked by a service-technician.
Clean the fan grille.
•
Provide for sufficient air circulation.
•
Connect other speakers.
•
Check speakers.
•
Switch amplifier off and have the device
•
checked by a service technician.