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Denon seperates hi i have a denon seperates system unfortunatly the when i play the cds the music jumps like crazy ive tried putting a disc cleaner through it with no luck,please can anyone help or advise me what to do as i dont want to throw it away it also has a tape component and a mini disc component to it ,the component im having trouble with is the denon ud-m5 3 cd player,

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The most likely cause of this problem is the laser is becoming weak. You may be able to get a bit more service out of it by manually cleaning the laser with a cotten bud and some alcohol. However the only real solution is to replace the laser assembly.

It depends on how good at taking things apart and putting them back together you are, weather you should try this yourself. The laser assemblies often have the part number on the side of them, if not you will need to contact Denon who may tell you what it is if you are lucky.

Almost all laser assemblies come fully clibrated and all you need to do is remove the old one and replace it with a new one. You can get the parts from CPC in the UK unfortunately I don't know about other countries.

Regards, Andrew

Posted on Sep 14, 2008

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Won't play, just keeps skipping discs


Good morning Lori.

My troubleshooting thoughts run something like this:
  1. It sounds like it's skipping on every CD.
  2. This is (according to the manual Denon DCM 390 Operating Instructions Manual Troubleshooting a cauousel-type system, so it has a tray that you manually place CDs into, rather than a cassette that you put all the CDs into and then insert into the player.
  3. Most of the manual Troubleshooting section puts the blame for discs not playing upon dirty or damaged discs - you're told to re-load it, clean the disc, try another disc.
  4. If this is just one set of discs, then it's worth it to pull out at least a couple and try other discs that are clean, don't have scratches, and, hopefully, that you know work on another player. If they work, then, kudos to the manual, the discs may need cleaning or replacement.
  5. If you're playing home-burned CDs, you may need to finalize them for play. Computer CD burners can often give you a lot more leeway in what they're willing to play, since there is a much more sophisticated bunch of code running the burner that will have some expectation that in-process discs might end up there.
  6. Last, but, IMO, most likely - steady skipping on every CD can mean that the CD laser lens is dirty. Over time, dust on CDs or from the air drawn through the chassis can build up on the lens, which has a fairly small gap from lens to Disc surface. In something like a DiscMan or other portable CD player, the lens is usually pretty obvious and can be blown off with some canned air or brushed with a micro-fiber camera lens cleaning brush. In this case, it's what I suspect is the problem. Depending on what gear you might have, or how much you'd want to spend on it, what I'd suggest to try fixing this possibility would be :
    1. Use a commercial CD Lens cleaner. They'll likely run 6 to 10 dollars. A list here Amazon com cd lens cleaner Electronics has lots of possibilities. You'll want one of the ones that looks like a CD with a small brush attached to the bottom, possibly some fluid. You'll put it in the player, hit play, it'll at least attempt to play for like 5 to 30 seconds, and end. The brush will be spun past the lens multiple times, removing dust / gunk buildup.
    2. Use canned air. I'm talking commercial stuff expressly meant for cleaning computers and other gear that will suffer from a blast of oil-laden air from a garage air-tool compressor. Examples here Amazon com canned air Electronics
    3. Open the system up. I can't give too much guidance other than I did it years ago on my system - make sure it's unplugged before starting. Remove screws attaching black cover to chassis, and you may be able to get in with a brush to clean the lens. Don't go this direction unless you're confident of your DIY skills.
    4. In any case, try to stick with dry cleaning methods like the cleaner disc or canned air. If you do anything with direct contact, stick to clean microfiber cloth or brushes, and be gentle - no scrubbing motions. It's a tiny lens, and a scratch or mis-alignment from forceful handling will be the end of it. If a liquid must be involved and isn't part of a commercial kit, nothing but distilled water. Many, if not most, of the CD lenses are molded plastic, and glass cleaners, likely as not, will attack the lens surface and roughen or fog it.
  7. Last note - the reviews on Amazon for this unit are not kind. It sounds like the skipping and failure to play is not uncommon with this particular Denon model. If the unit is still under warranty, I'd grab the opportunity to have someone fix it for real and deal with any faulty mechanisms. If not, you have little to lose with the above, but the reviews suggest that replacing with the same model might not be the best idea.
Good Luck, and Happy Holidays

D

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Hi!
Make sure discs are clean, purchase a lense cleaner to remove any grime or particles from the CD lense. If still no joy your laser is either out of focus, miss-tracked or completely shot and requires replacement. If it's the latter, rplacements can cost from $50 upwards depending upon what is required to fix the problem. You may be wise to replace the system OR purchase a seperate CD player (as used in a seperates system) and plug it into the aux input.

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Hi there, this lens may be dirty or it may have a thin layer of heat film that is causing it to not read in a consistent manner. i would try to clean the lens with a good CD lens cleaner. if the cleansing doesn't restore the lens to its original reading state, this will confirm lens assembly failure and you will need to replace this assembly.


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