Question about JVC MX-KB30 CD Shelf System

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My JVC MX-KB30 reads protect on screen , what can I do to fix this?

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I am copying this solution posted by another person which works:
I know I'm finding lots of old posts about this JVC model MX-KB30 "PROTECT" problem but - I FIXED IT!!!!


Figured it had something to do with the speaker circuit board. Decided to look for a reset on the board itself. Not sure that I found one, basically becuase there was not a perception of a button pressing down, but the "PROTECT" cleared and the sound is coming through the speakers again. The sterio works fine.

First - as when working on all electronics - unplug the unit and make sure all static electricity has been discharged before working on it. You will need a small jewlers philips screw driver as well as a mirror for looking down on top of the electrical components.

Remove the cover of the sterio surrounding the sides and top of the unit - there are screws on the sides, top and around the edges of the back fo the unit related to this piece. You do not have to remove any other pieces.

There will be a circuit board attached to the back center of the unit that has a black cable running to the headphone plug and the speaker connections are also running through this board.

If you face the front of the unit, looking at the sound circuit board from the right side, there will be a small black - square looking - voltage regulator (I think that's what it is anyway) that you will see some voltage information and some switch setting pictographs (along with the numbers 1, 2, 3).

On top of this black unit (here is where you need the mirror) there is a square hole that looks down inside this unit as well as a round hole that you will see white plastic inside.

Using the jewlers screwdriver, carefully press on the white plastic once or twice (I couldn't tell that it had pushed down) particularly becuase I have no clue how sturdy this piece is.

With the cover still off the unit, plug it in and make sure the "PROTECT" message has disappeared and the speakers are working again.

That's exactly what I did and the darn thing started working again.

Maybe I just got lucky, but this is a nice sounding unit and it would be a shame to see folks toss it away for such a simple fix if that is indeed what did it.

Excellent suggestion - worked like a charm. This is a like a 'circuit-breaker' to protect the system against high voltage fluctuations. So press firmly but gently and the white piece goes in and stays in. Thats all. DO NOT push too hard. Important thing is to use the right tool to push the white piece. Again - thanks for this - saved me some $$$.

Posted on Oct 01, 2011

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If your handy you gots ta open this thing up and replace the bad capacitor (hint-its the little cylindrical thing thats got burnt smoke on it) on the IC board.  Also, check for a short while your in there.

Posted on Nov 13, 2009

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SOURCE: jvc home component mx-kb30 protect mode on

First check that the speaker wires are not shorting, if okay! the problem is in the audio output stage of the receiver, the protect mode comes on if a load is detected.

Posted on Apr 26, 2012

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Jvc home component mx-kb30 protect mode on


First check that the speaker wires are not shorting, if okay! the problem is in the audio output stage of the receiver, the protect mode comes on if a load is detected.

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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.

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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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