Question about JVC MX-D402T Shelf System

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Mx-d402t jvc cd player - trays will not open

CD trays will not open on mx-d402t JVC. Not certain if the discs are jammed inside. It sounds as though it is getting ready to open. It also shows as though it were playing; yet no sound. However, sound comes through the speakers when playing the radio. I checked and it indicates the trays are unlocked. I noticed that there is a letter A with an arrow pointed to the right; do not recall if it was like this before. Also cirular arrows above it showing symbol for tape player. I unplugged it to see if it would go back to its original defaults; yet, it remained the same. Any suggestions.

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  • Anonymous Oct 12, 2008

    cd player will not open on a stereo everything else works



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Just got one of these at the dump. Two problems quickly jumped out at me:

1. As mentioned above, the CD trays stuttered and clattered but would not open.
2. Volume control is unable to be reduced from the highest level (50).

CD tray table was an easy fix.

After removing the 8 cover screws (6 on the back and 2 on the sides) and the 6 tray mounting screws (two through the back and one in each corner) I unplugged the only electrical connector - it is a simple push in pull out type. Note the way it plugs in before pulling out - it doesn't matter which end which you unplug. I set the entire changing assembly aside (outside the tower) on a speaker - just for height because the cable is fairly short. Then hooked the electrical strip back up and turned the power on to the main unit. After setting the controls to CD and pushing the eject button for tray #1 it only took a gentle nudge of the linkage to allow the entire stack to free up. Cycled through the trays several times and each slip in and out as designed.

The next step is not for the faint of heart. Since something (in this case just some cat hair and normal 10 years of dust) was causing the trays to stick it was decided that the entire unit should be thoroughly cleaned. With most electronic devices as long as there is no power on the component it is perfectly okay to wash the entire unit with hot (really hot) water from your kitchen sink. A soft tooth brush and some liquid detergent help the process. After a good long wash and rinse, gently shake as much excess water from the piece and find a supply of warm flowing air. Set the component in front of the air supply and allow it to dry for a looong looong time. 3-4 hours is good.

Hook it back up, cycle the trays and observe the function, paying special attention to where the moving parts make contact. Then shut it down (or not depending on your confidence in your hands) and apply some WD-40 to a q-tip. Using the swab apply a small (the key word is small - you do not want oil based liquids to get anywhere near the CD reading LED) amount of lubricant to the previously observed bearing points. This procedure is best accomplished as the linkages are moving throughout their entire stroke but be careful to not catch the swab in the moving parts.

Now (while I wait for my C changer to dry out), I will trouble shoot the volume problem. If it is something that can be fixed, I will update this post. Please don't assume that just because something has some years on it that one should "expect" it to fail. Oftentimes it just needssome TLC.

Posted on Nov 24, 2008

  • chengny Dec 21, 2008

    Now the volume control issue. I forgot that I had promised to explain this repair - if it was something that could be done economically and by a reasonably accomplished handyperson.

    Good news: It cost nothing to fix and was not difficult at all. From what I read it is a very common problem with these units.

    There is no soldering involved in this fix and if you could follow my instructions on how to free up the CD shelves you can do this fix too.

    Unplug and dissipate any remaining charge in various capacitors by holding the power button in for 10 seconds or so.

    Go back into the unit and remove the CD stack just as before. Set it aside. Looking from the back of the player you will see two rectangular PC boards directly behind the face plate. Notice several of the same type of ribbon connectors as feed the CD stack. Using a Sharpie, or something similar, make marks that indicate which ones go where. Again as before, it does not matter which end is released. Just pick the end that is easiest to get your fingers on. After that it is only a matter of unscrewing about 15-20 phillips head screws and the releasing the two PC boards by wiggling them free.

    I think, if I remember correctly, that the volume control is on larger of the two boards. The smaller board only needs to be pulled to gain access to the main board.

    Now, once you have the board in front of you. Oh yeah, before you do anything. On the front of the face plate you need to pull the knob off and remove the nut that secures volume shaft base to the face plate. The volume adjustor is not a potentiometer/rheostat type of control. It is what they call a rotary encoder - you know the kind of dial that never ends. This type of variable controller does not know it's position it only senses a change in position.

    Take a jewlers screwdriver (slotted) and pry back the four little ears that are bent over the base (which is soldered into the board). Lift the cover with the shaft still passing through it away from the base and turn it over. You will see a circle with 8 -10 maybe little copper arms radiating out from the center. Looks like a pizza thats been cut up. Clean as much junk out of the shell with a q-tip and gently sand the little arms or scrub them with some Comet. Get them good and bright and also the three tiny springy contact points in the base.

    Good luck I am rushing to finish this.


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The best remedy is to clean the led reading sensor inside the CD deck.
But, how to do? You must be careful to open the case cover to reach the deck


Posted on Nov 24, 2008

  • Rick Foster
    Rick Foster Nov 27, 2008

    The volume of MX- D402T:

    The effecient way to make it work is to replace the exact volume tuning control device itself from the chassis.

    Or make a such repair by softenning the sticky liquid inside the tunning control that serve as lubricant to its contact.

    Try to put a solvent inside the diaphram then blow w/ suffucient air until all get out then make sure that a little push in to tiny pin stripe to stick in its contact to adjuster knob control on the center.

    Repack the the part the resolder it back on the chassis.

    Presto!! Now you can obtain perfect volume sound from zero up to 50.

    How to do is with care and defficulty thats whay be aware.


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Its close to 8 years old what do you expect i have one and its trays failed a long time ago

Posted on Sep 16, 2008

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