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Denon udcm m7 cd player often reads ERR on play and eject

My denon udcm m7 personal component system cd player often gives an error message (ERR) when I hit play or eject on all three disc. I have to keep turing it off and trying again before it actually, randomly plays or ejects. Since Denon no longer has parts for this system, before I pay for a service center diagnosis, does anyone know what this might be? Has been doing it since I got it (refurbished) in 2000, but doing it more so now. OR does anyone have a replacement I can purchase?
Thanks, M in So Cal

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  • mssmft Apr 29, 2008

    Also, does anyone know the difference between the UDCM-M7 system and the DMM-M7 system. Is there another model CD player I can substitute for the UDCM (3 cd changer) with the rest of the components being UDCM?

    Thanks again.

  • mssmft Apr 30, 2008

    Thank you, Jerry. Will look at the link and figure out if I'm up to cleaning it myself. However, As this was a problem very early on and has gotten worse, I don't know if it is just cleaning.

    this is an older player, so Denon doesn't support it anymore - doesn't even have parts. The problem is finding anything equivalent in size to replace it. A lot of people love this player because of its size and sound, which is why I am considering fixing it.

  • Anonymous Jun 21, 2008

    have the problem with my udcm-m7...none the 3 cd doors will open and the ERR message present.

    tried power on/power off, and it sounds like i need to have the doors open before i attempt the laser clean solution?

  • paul4535 Mar 05, 2009

    Turn on but system reads err but doesn't load, unload or play cds.



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Try cleaning the laser first. Take care, because it is delicate.

Some instructions of how to clean a CD laser:

If the cleaning does not fix the fault, it is possible that the laser is weak, or there are some problems in the electronics in the CD player. This is not something you will be able to service yourself, unless you are properly trained, have experience, and have the proper setup to perform CD player servicing.

In most cases these CD players are not cost effective to service. You can contact the orignal manufacture for details or any recomendations.

Jerry G.

Posted on Apr 29, 2008

  • Jerry Greenberg
    Jerry Greenberg Apr 30, 2008

    At this point you have nothing to lose by trying to clean the laser lens yourself.

    Your best reliability would be to send the unit out to a service shop that has a tech who is experienced at servicing CD players in general. He may be able to service the unit for you if it is a fault where generic parts can be used if required.

    If the laser is a little weak, it may be possible for the tech to increase the bias drive to the laser emitter if your model has such an adjustment. He should use a laser test meter to make sure that the emission is kept in spec. If the laser is set too strong, it will have too much reflection back from the disk media. Also, increasing the laser drive accelerates the wear factor of the laser. This may get you some more hours out of the laser.

    If the tecch is experienced, has the instrumentation, and has the service manual for your player, he can try to do a full re-alignment of the electronics and mechanical tracking for the laser. This may also get some more life out of the player. If he increases the laser drive bias he may have to go through this process anyways.


    An explanation about audio equipment:

    Over the last number of years CD players have been greatly improved in their performance.

    As for sound quality, any good audio equipment should not have any distortion that can be heard. In high end equipment there should not be any difference in the sound characteristics or quality between devices. This is what attributes to the accuracy of the device. In quality audio equipment, the output should be accurate to the sound of the recorded material without altering it in any way.

    At a reasonable cost, older CD players were not as accurate as the ones of today for their reproduction. To have high accuracy the cost was too high for the average consumer.

    I have not done many repairs on the model series you have, but from memory I can tell you that the accuracy of a medium priced player in the audio file level of players the accuracy will be better. The distortion is lower, and the D/A decoding is more accurate for the cost. The internal computing is faster, and they have much improved design.


    If you go to a good audio equipment store, you should be able to easily find a good CD player that can outperform the one that you have. As for the physical size this is another issue. Good CD players are still expensive.

    A good player will outperform the general consumer types that you see in shopping center stores or at regular retailers. If you want something of good performance you should be shopping at an audio file store.

    If you want the best possible, you should consider going to a professional distributor that supplies professional audio equipment for recording studio and broadcast applications. This level of equipment is also much better supported than general consumer products. Everything about it is constructed better, and assembled and adjusted with very high standards.

    As like anything electronic or mechanical, after a certain number of hours of use there will be failures, and required maintenance. Because of the way progress is going and the technology is changing, this will eventually force the users to have to buy new equipment. There is the eventually non availability of parts, availability of dedicated service tools, and service skills to work on particular models.

    Jerry G.


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I turn the machine off, then turn it on, and lightly smack the machine on the side as it's turning on. You'll hear it catch and then start without the ERR. I've been doing this for about 2 years when it gives me a ERR message and although it's cheesy and clearly not right, it works every time.

Posted on Mar 03, 2013

  • Jason Chuan Mar 03, 2013

    I turn the machine off, then turn it on, and lightly smack the machine on the side as it's turning on. You'll hear it catch and then start without the ERR. I've been doing this for about 2 years when it gives me a ERR message and although it's cheesy and clearly not right, it works every time.



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