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Kenwood A97 Amplifier will turn on then go straight into "PROTECT". I lose all control of the amp, I'me tried disconnecting and reconnecting the speakers, made sure its all wired up properly and even checked the fuse in the plug but still nothing

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  • rando30 May 15, 2009

    same problem

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Hi can you please tell me what is the solution

Posted on Mar 31, 2009

Help! im having the exact same problems with this model

Posted on Aug 28, 2008

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Posted on Jan 02, 2017

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The red light you describe on your amp, is the protection mode warning light. An amp goes into protect for many reasons. Here's a checklist.

1st check the fuse (s) on your amp and make sure they are not blown.

2nd check the inline fuse next to your car battery (if you have an inline fuse)

3rd, disconnect the speaker wires with amp on, does the light go off?

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It is possiblethat the amplifier had encountered a fault with a higher current drain whichhad triggered it to a protection fault condition. The fault can be with youroutput drivers. Please check for short on the outputs fitted for both the channels.Use a meter after disconnecting to check for short in the drivers. Disconnectthe positive and negative voltages to the output and see if the protectchanges. Even a fault in the preamp stages that drives in high current into theoutput can shut the Amplifier. Sometimes this can be a noise which can be a HUMor HISS before the protect works. Faulty capacitors in these circuits also cancause similar issues and needs close observation.You need to confirm andreplace the specific stages or outputs. If not there can be issues in themother board. Maybe the protect circuit by itself is shutting off due to afaulty bias or there is a leak in any voltage/current sensing circuit. Alsodisconnect the speakers and test, if the amplifier comes out of the protectmode then check for short on the speakers.

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It is possible that the amplifier had encountered a fault with a higher current drain which had triggered it to a protection fault condition. The fault can be your output drivers- the MOSFETS/IC's fitted for both the channels, Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise like a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.
You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board, maybe the protect circuit by itself is shutting off due to a faulty bias , maybe a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the protect is off then check for short on the speakers.

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ok well it could be two thing wrong your amp dont have a good ground or your amp is a smar amp and your subs must have to be hooked up so the power from the amp cn go to the subs so the amp can see that you do have subs hooked up to take it out of protect o and look at your fuses to to smal or to big will send it to protect to

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Sounds like its going into protect mode-try disconnecting the speakers from the amp entirely and turn the system on if it stays lit up- then ya know its the speakers (one of them at least) thats making your amp shut itself down. If thats the case look into replacing the speaker thats causing the problem.Also make sure that you have sufficient wiring to your amp - at least 8 gauge if you can. check all terminals /power/ground make sure everythings connected tight and not grounding out anywhere

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