I have an mmats pro audio car amplifier model d800.2, the problem is whenever i power it up it powers up and goes into thermal protection. can you tell me if it is a fried cap or something
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just try to find any of Ur speaker is not have short wires, by Disconnecting one by one it will work again .use the same recommended impedance speaker and do not overload the output channel .hope it will work normal if any damage or short is not happened inside.first remove all the wires of speakers and pull out the power cord also .if By disconnecting SPK wires and reconnecting power again protect goes off and radio should turn on normal usually.if you don't have any short circuit inside apm of your radio.RCA cable have no role in this issue.
If an amp has no load, as in there are no speakers connected to it, then it will go into protection mode because it sees an infinite load. Be thankful that it has a protection mode, or it would be toasted!
remover cover check your capacitors. if the top is bubble out there blown, they can be replaced by sodering a new one on. also just visually inspect all components in amp
I would not remove the thermistor as it is there for your own protection. Rather take the amplifier in and have it checked. It can be something as simple as a dry or loose joint. Removing the thermistor can result in a total burnout of the output or power supply stage. If not both. Cost are extremely high in repairing RF Amplifiers.
Hi,
Amps normally have several kinds of "protection" modes. Common ones are thermal, voltage, and short. Do you know which one you have? If the amp isn't hot, and goes into protection immediately before doing anything, we can rule out thermal protection. The next thing you should do is disconnect the speaker/subwoofer leads from the amp so that it only has power, ground, and remote connected. If the amp comes on with no speaker load, connect the speaker and see if it goes into protection. If it does, then you probably have a short-protection. Hope this helps.
There are 4 reasons an amplifier tries to protect itself.
Overheating - thermal shutdown.
Over Impedence - The subwoofers installed are not configured into a load the amplifier can handle.
Output is grounded - a positive wire strand may be touching the ground terminal - a wire may be shorted, or a speaker voicecoil is blown.
Intennal problem - Output on amplifier blown, or some other component has failed.
Check your wiring to the amplifier again - if all is good - disconnect the speakers and try to power on. If the amplifier turns on normally - test the speakers for blown coils.
If the amplifier still goes into protect mode - the problem is internal and needs professional repair.
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The thermal protection would have reset when the amp cooled down. When cool, if it still goes into protection when it powers up, there are likely blown output transistors. To be sure it's not a wiring problem, disconnect the speaker wires 'from the terminal block of the amp' and disconnect the RCA cables from it. If it still goes into protection, the output transistors are almost certainly shorted.
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