Question about JVC MX-J900 CD Shelf System

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Black and White video output

How could i fix my JVC MX-J..or something which showed a black and white output?

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Re: Black and White video output

Check your tv system,(PAL,NTSC etc.)same as your cd player,go to MENU and select both to ,AUTO.

Posted on Feb 18, 2007

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JVC MX-GT88 sound system showing protected them shut off why

Chances are that something is blown in the power output stages and units shuts down to protect against further damage.

Repair or replace, which ever is cheaper!

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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.

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I'm not really familiar with your specific model, so I don't know what the output stage looks like. I'd guess that this unit has a large black 'amp-pac" for the amplifier section. This should be attached to a heat sink in the rear of the unit. Look to see what the markings are on that part. I expect to see STKxxx. Can you post that here?


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1 Answer

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There is no Phono input on your JVC.

What TT are you trying to hook up? If it's a traditional one you would need a preamplifier to boost the tiny signal from the cartridge to a suitable level for the AUX to use.

If you have an old traditional receiver with a Phono section hanging around you could rig something up between it and your JVC.

Plug the TT into Phono on the old receiver. Run RCA cables from any Tape REC output to the AUX. Done.

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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!

Apr 13, 2007 | JVC MX-KB30 CD Shelf System

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