Amplifier protection circuitry

There is a problem in either the power supply or amplifier output stages. The unit is programmed to shut down in such an event to protect other circuitry.

Using a schematic see if you can isolate the power going to the output stages. If unit stays on then the anomaly is in power amp stages. If it still shuts off problemo is in power supply - check diodes and capacitors.

Does it come up with Protect as soon as you turn it on or does it play for a bit and then come up with protect?

The Amplifier has a Fault and is shutting down to protect itself (If it will jet you play for a bit). Repeated cycling of this will cause a total failure in the Amplifier (If it says protect as soon as you turn it on).

If you haven't got the Technical ability to have a look at it yourself then your only option would be to take it to a service engineer.

which means the power shuts down as soon as you try to turn it on. disconnect all speakers from this amplifier -then try . if it still shuts down it indicates protection circuit is activating because a channel or two is bad.

TRY TO POWER THE AMPLIFIER UP WITH NO RCA INPUTS AND NO SPEAKERS CONNECTED. IF THIS PROBLEM IS STILL PRESENT, THEN THE AMPLIFIER WILL NEED SERVICE. KEEP IN MIND THAT YOU STILL NEED TO VERIFY THAT YOUR POWER CONNECTIONS ARE SOLID, NO LOOSE GROUNDS, ETC. ALSO, IF YOU HAVE A VOLTMETER, MAKE SURE THAT YOUT REMOTE LEAD HAS APPROX. 12 VOLTS MEASURED FROM GROUND. SOMETIMES A SAGGING REMOTE LEAD THAT HAS LESS THAN 11 VOLTS CAN CAUSE A GOOD AMPLIFIER TO EXHIBIT THESE SYMPTOMS. AFTER ALL, IF THE AMPLIFIER STILL DOES THIS, THEN THE PROTECTION CIRCUITRY IS SEEING ONE OF THE THREE TYPES OF FAULTS WITHIN THE AMPLIFIER AND IS SIMPLY SHUTTING IT DOWN. SOMETIME AFTER WHICH IT TRIES TO POWER UP AGAIN, ONLY TO SEE THE SAME FAULT, THUS REPEATING THE CYCLE CONTINUOUSLY, INDICATED BY THE POWER LIGHT GOING ON AND OFF. LET ME KNOW IF YOU NEED MORE ASSISTANCE....V

Hi the protection light comes on when there is a problem within the amps. circuitry. Generally speaking the protection light normally comes on when powered up while the amp checks all of its voltage rails so that they all lie within a specific tolerance, when all have been verified to be in spec. then the protect light goes out & the power light comes on. If the protect light stays on then a fault exists within it's circuitry. Cheers, acbva.

Activated protection circuitry means that the amplifier is seeing conditions it does not like and is shutting down the power to prevent further damage.
Either you have a short in your speaker wires, in your speakers, or a blown amplifier.
Disconnect both speakers and turn on the amplifier. Does it still give the error message? If it does, your amp is blown. If it does not, carefully inspect your speaker wires and their connection. Make sure all looks good and reconnect the speakers and try it again. Still get the error message? You likely have a problem in your speaker cabinet(s).

the output is blown. It is in need of service.
There are many different ways that an amp can fail but the two most common failures are shorted output transistors and blown power supply transistors (< those are not blown). There are several types of protection circuits in amplifiers. The most common are over-current and thermal. The over-current protection is supposed to protect the output transistors. Sometimes it doesn't work well enough to prevent the failure of the output transistors but it will work well enough to shut the supply down before the power supply FETs are destroyed. If the amp remains in protect mode, goes into protect mode or blows the fuse as soon as the remote voltage is applied, shorted output transistors are almost certainly the cause.

Protection mode; follow this link to get a manual for the amplifier: http://mobile.jlaudio.com/products_amps.php?amp_id=439

Below information is from the manual:

Status Indicator Lights / Protection Circuitry
There are three status indicator lights on the top of the amplifier. These are as follows:1) "Power" (Green): lights to indicate that the amplifier is turned on and operating normally.
2) "Thermal" (Red): lights to indicate that the amplifier has exceeded its safe operating temperature, putting the amplifier into a self-protection mode, which reduces the power output of the amplifier. The red light will shut off and the amplifier will return to normal, full-power operating mode if the heat sink temperature drops back to a safe level.
3) "Low ω" (Amber): lights to indicate that the impedance of the speaker load connected to the amplifier is lower than the optimum impedance load range for the amplifier. When this light is on, a protection circuit engages and reduces the power output of the amplifier. The amber indicator will also light when a short-circuit is detected in the speaker wiring (this can be a short between the positive and negative speaker wires or between either speaker wire and the vehicle chassis).
There is only one condition that will shut down an undamaged 500/1v2 completely… If battery voltage drops below 10 volts, the entire amplifier will shut itself off. The green "Power" indicator on the top of the amplifier will turn off when this occurs. The amplifier will turn back on when voltage climbs back above 10 volts. This may happen in a rapid cycle when bass-heavy program material causes a weak charging system to dip below 10 volts momentarily. If this is happening in your system, have your charging system inspected to make sure it is working properly.
For information on troubleshooting this amplifier, refer to Appendix E (page 21).

you may have to many electronics plugged up to one circuit in your house. try plugging the sound system into a different socket and that might help.

yes,pls.stop plugging the system,you may harm your system if you do so,the system has it's own system analysis mode,and if there's something wrong in the circuitry,it will activate,you need the authorize service center my friend,it's a technical problem.