20 Most Recent JVC MX-KB30 CD Shelf System Questions & Answers

Maybe something's jamming it, try fixing the drive, so it comes out.

JVC MX-KB30 CD... | Answered on Jun 02, 2012

Here's a free manual download.



JVC MX-KB30 CD... | Answered on Feb 01, 2012

Turn the stereo on, wait two minutes for the demo to start running then press the "demo/cancel" button located under the "sound mode" selector.

JVC MX-KB30 CD... | Answered on Dec 13, 2011

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.

JVC MX-KB30 CD... | Answered on Oct 01, 2011

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!

JVC MX-KB30 CD... | Answered on Oct 01, 2011

Generally speaking, an amp attempts to protect 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.

JVC MX-KB30 CD... | Answered on Apr 18, 2011

the audio amplifier output are fried

JVC MX-KB30 CD... | Answered on May 17, 2009

A desperate longshot but the only i have to offer: It might be a problem with the electricity. if possible try and install it at another location in your house, using other electricity sockets. If the problem is solved by relocating the system, you might be looking at wiring problems (audio equipment can be very sensitive to that), if changing anything in the installation process solved the problem then the problem was probably due to bad grounding and "loose" electricity. Try making the installation as "clean" as possible, avoid tangled wires and stressing a single socket with too many electric appliances. If the problem persists, and you are still under warranty, I suggest contacting your local JVC dealer. If you're out of warranty I suggest locating a professional repair person. Good luck

JVC MX-KB30 CD... | Answered on Jan 26, 2009

when i had this problem my wires were touching the case. other times the wires were touching eachother

JVC MX-KB30 CD... | Answered on Nov 01, 2008

press &hold stop then press the eject button.

JVC MX-KB30 CD... | Answered on Jul 30, 2008

these units are designed in such away they are very suseptible to power surges, Brownouts. And a lot of times they just stop working through no fault of the user. A transisors or capacitor fails and the unit just does not work properly and goes out. The issue is generally the unit is priced so if you took it to a repair shop it would cost between $50 to $100 Dollars to repair. If they can get the parts to repair it or if it can even be repaired cost effectively.

JVC MX-KB30 CD... | Answered on May 13, 2008

Maybe you should fix the cds or clean them or try to fix the disc reader in the radio.

JVC MX-KB30 CD... | Answered on May 01, 2008

Take the display panel out, and then look at it to fix it. If you cant fix it, then its time to get a replacement.

JVC MX-KB30 CD... | Answered on Mar 31, 2008

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