Question about JVC MX-KB30 CD Shelf System

4 Answers

Protect Everything seems to work but the sound. The speakers make no sound at all and the display says protect. if i get close to the system i can hear the cd player wiz and make noise when it changes cds and everything else seems to be working too...except the sound =(

Posted by on

4 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer
Re: Protect

How hard do u need to press with the small screwdriver? I tried this and the white piece didn't feel like it pressed in at all. The system still shows protect also.

Posted on Feb 05, 2010

Re: Protect

This solution worked perfectly. Thanks for posting

Posted on Mar 21, 2008

Re: Protect

I had the same problem as steve. the protection was on and I did exactly what he posted and it worked thanks steve.

Posted on Jan 02, 2008

Re: Protect

I know I'm finding lots of old posts about this JVC model MX-KB30 "PROTECT" problem but - I FIXED IT!!!! 8-) Daugter had the same difficulty after a series of power outages. 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. Enjoy!

Posted on Apr 23, 2007

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

This set volume increse for 14 point. but system is off. then display showing there protect. how relese to protect.

Normally amps go into protect mode when a short circuit is detected. Check all speaker wires for faults or bad connections and the speakers themselves. If it does this with no speakers on, check the main power amp inside for short circuited parts.

Oct 16, 2015 | Audio Shelf Systems

1 Answer

Philips MCD702 Shelf System no sound

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 with your output 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. 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 which can be 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 or there is a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the amplifier comes out of the protect mode then check for short on the speakers.

Jun 26, 2012 | Philips MCD702 Shelf System

1 Answer

Protect comes on why

Protection display will come over this type of set, when it is overloaded or system confused condition. Just unplug the device from AC mains socket and replug it after 4 to 5 minutes, and see whether it shows any protect display. If it shows it again, just disconnect the output loads, ie, connected speakers, and check. Again it displays 'protect', the internal circuit, especially the output amplifier circuits has the trouble, and the system need service. if it does not show protect display, after disconnecting the speakers from it, check the speakers or its connecting wires for damage. OK.

Jan 20, 2012 | Sharp Audio Shelf Systems

1 Answer

Power protect

is' protect 'appears on display?.remove speakers & check again.if then set work without error check speakers & cable. protect appears again there is a problem with power amp module.

Jun 14, 2011 | Sony MHC-RG40 CD Shelf System

1 Answer

My stereo won't work. Whenever I try to turn it on, it always turns off saying "protect." How can I fix this?

The protect has come on because it senses an output load problem, Turn the unit off, unhook the speakers and wires from the stereo, now turn the unit on and turn the volume down as far as it will go, this should reset the processor ic, if the word protect stays off you have a short in the wiring or bad speaker. If the protect comes back on with everything unhooked the problem is in the audio output ic pack in the stereo and will require a technician to remedy.

Jan 17, 2011 | JVC MX-KC58 Shelf System

1 Answer

What is "Press Power Protect"?

Hi Lois,
Stereo sytems have a protection circuit that alerts you by displaying "protect" when there is a electrical short circuit detected in the system, the most common short happens in a speaker, try disconnectig the speaker wires of both speakers(all speakers) at the back of the system, then play the CD or cassette player(although you will not hear anything with the speakers disconnected) and see if the unit goes into "protect" mode if the problem is still present then you have an internal short circuit and the system will need to be sent in for service or replaced(depending on age,repair costs). I would not recommend investing more than $80 into repairs. Now, if the unit does not go into "protect mode" then one of the speakers or speaker wires is shorted,be sure you check the conndition of the speaker wires before you replace the speakers, then you can replace the speakers(in a pair) and you should be back up and listening! Good luck and Merry Christmas !

Dec 03, 2009 | Sony MHC-NX1 Shelf System

1 Answer

Displays "Protect" on screen

the audio amplifier output are fried

Dec 03, 2008 | JVC MX-KB30 CD Shelf System

1 Answer

It says protect and then shuts off

que devo aser si cuado lo ensiendo se a paga y dise protect y se apaga

Aug 30, 2008 | JVC HX-D7 Shelf System

2 Answers



Dec 25, 2007 | JVC HX-D77 Shelf System

1 Answer

System keeps sayin protect

The word PROTECT appears because there is a short. It can be in your speakers, try running it without the speakers plugged, or look if the wires arent shorting. If it stil ldoes that, its cause there is a short in it, from the output section. The system does that to prevent from damaging the electronic components inside.

Nov 17, 2006 | JVC MX-K30 CD Shelf System

Not finding what you are looking for?
JVC MX-KB30 CD Shelf System Logo

376 people viewed this question

Ask a Question

Usually answered in minutes!

Top JVC Audio Shelf Systems Experts


Level 3 Expert

4518 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

The Knight
The Knight

Level 3 Expert

66476 Answers

Are you a JVC Audio Shelf System Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides