Question about JVC KS-AX704 Car Audio Amplifier

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Power Protectin stays on

When you put power to amp protection light comes on and it makes a clicking noise.

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Sounds like u have fried your amp. U didn't mention if u had speakers hooked 2 the amp. If u do, disconnect them and c if the problem persists. If it doesn't, u may have crossed speaker wires or fried speakers. I f it doesn't ur amp is more than likely fried. Sounds like that clicking noise could be the output circuit protection switching on and then off when it detects a short or problem.

Posted on Jul 18, 2008

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Sounds like you have blown your amplifier. There could be severqal causes for this happening. Take it to an electronics repair shop, but honestly you might just be better off replacing it altogether.

Posted on Jul 17, 2008

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1 Answer

Does anyone know what kind of transformer is in a soundcraftsmen class H power amp


Your Soundcraftsmen's transformer is ok. The protection circuit is kicking in and clicking because there's a problem on the outputs or else where.
Go to this link and read the last page for possible solutions. WARNING: Do not perform the reapir yourself if you do not have proper experience with high voltages!!!

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The word PROTECTin display


Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on; or it may turn on but produce no audio to the speakers.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'nekkid'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as another possible root cause for intermittent shutdown.

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I have a yamaha htr-6130 receiver that won't power on. When I push the power button it makes a click noise like it used to when it turned on immediately followed by another click. No lights come or or...


Generally speaking, an amp protects itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.


Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.


You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.


If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.


If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

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What does it mean when the red protection light illuminates


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.

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1 Answer

The receiver turns on riefly and then makes a


The clicking noise is the protection circuit., sounds like you have a grounded speaker wire, but you say the speakers are not connected so the amp may be toast. Is there any smell of burnt wires? This is ussuallt noticable near the circuit board if something failed!

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You can hide the files & Mark Them systems files & it will be protected by the system
Right click on the file & Properties on the bottom select the system and apply and ok

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1 Answer

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Make sure your head unit is off.

Reset the amplifier using the manufacturers specified method. Usually this is just power down briefly and then back up. I usually pull the amp fuse and make sure all LED's on the amp go out. Wait 10 seconds, and then put the fuse back in.

If the LED comes back on when you reconnect power, without the HU being on, you've got a bad amp.

If the LED does not come back on after reset, then check for short circuits on the speaker leads. Still leaving everything off, from the amp terminals, remove both wires to a specific speaker and check for shorts.

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check youre wiers + and -

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Grab yourself a test light and make sure that not only the 12v red power wire is putting out power but the thin blue or 12 volt turn on wire is also showing power. Then test the ground terminal and make sure u have a good ground. If that doesnt work try checking the amps fuses and check the fuse and connection on the battery. If everything checks out ok and the problem persists then put a small test speaker to the channel outputs and make sure that u are getting noise from those channels if you dont get any noise then u most likely have bad outputs and blown channels, you will need a new amp. Good luck, hope i was good help.

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2 Answers

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it's blown....probably, check your connections and make sure your presenting it an ohm load it can handle....so check the sub with a dmm.

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