A 4155
PA Amplifier Stereo 2x150W
Front Panel
1. Mains Switch
When you first press the switch, a soft start circuit will run to avoid a surge
strike. In about 3-4 seconds there will be a click to indicate that the soft start
has finished. 1-2 seconds later there will be another click to indicate the
amplifier is connected.
2. CH-A/CH-B Input level control
Adjust the control to the desired volume. Only use the CH-A control whilst
amplifier is set in Bridge or Parallel mode.
3. CH-A/CH-B Clip Value Indicator
The LED will light up red to indicate when the output signal has reached its
clipping level. If this occurs adjust the input level controls so the LED turns
off. When the audio signal is being recieved at the input the LED lights
continuously. If no sound comes from the speaker its possible that there is a
short circuit in the speaker line. Turn off the amplifer, detect where the fault
is occuring and remedy the fault.
4. CH-A/CH-B Protection Indicator
The LED will light up yellow to indicate the following; the power transistor’s
temperature is over 100°C, there is an issue or fault with the amplifier and
when you have turned amplifier on after its been off for 4-6 minutes.
5. CH-A/CH-B Signal
The LED will light up green to indicate when there is a signal input for
channels A and B.
6. Power On Indicator Lamp
The LED will light up blue to indicate the amplifier is turned on.
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