Question about Denon ADV-M71 DVD Player / Receiver

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Denon ADV M71 CDVS

CD will skip for 2 seconds randomly on discs. I have blown out the unit with canned air, and used a clening disc. What else can I do?

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Denon ADV-M71

Posted on Dec 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

Dec 09, 2015 | Denon Home Audio Dcm-290p 5-disc Auto Cd...

1 Answer

May be duplicate... I have 2 Denon cdr-w1500 recorders. They both started the same problem at the same time. I just cleaned them with q-tips and canned air (no q-tip fibers were left inside the units). ...


continuest uses of ant cd player or recorder will damage the eye. try 2 leave it upside down 4 a day 2 see if there is any dry spots in the eye. if not restart the cd player all day until it reboots
with a cd any kind. if unit is broken time for a dvd ,cd recorder/player. good luck buddy

Aug 24, 2014 | Denon CDR-W1500 2-Disc CD Recorder

1 Answer

How do you clean the optical lens


You can buy sens cleaner disc from most of the electronic spare part selling shops. buy one and insert it into the player. It will clean the optical lens automatically. The disc won't cost more, and can be used repeatedely.

May 22, 2012 | Denon ADV-M71 DVD Player / Receiver

1 Answer

I don't founr cd 74 mn 650mb, what use the DENON CDR M30 ??


If I understand your question, it can play any kind of music CD but it can only record on CDR-Audio or CDR-Music discs only.

• Only audio CD-R/RW discs can be recorded with this unit. "Use Audio CD" will be displayed when a disc other than one

for use with audio such as a CD-R/RW disc for use with a personal computer or another type of disc is loaded. (See "Discs that Can Be Used with this Unit" on Page 5.)

• CD-R discs can be recorded to only once. The recorded information cannot be erased.

• The recorded information of CD-RW discs can be erased. When this disc has been finalized, erase after the finalization removal operation has been performed. (See "Cancellation of CD-RW disc finalizing" on Page 28.)

• Recording mistakes made with CD-R discs cannot be erased; therefore, it is recommended that a CD-RW disc be used until you are accustomed to the recording operation.


If you desire 74-minute blank disc just Google "cd-r audio 74". The unit will also use 800MB 80-minute CD's.

Jan 31, 2011 | Denon CDR-M30 CD Recorder

1 Answer

My denon adv 500sd wont read the discs can anyone help


If your unit has some time on it it probably has a dirty lense on the laser assembly. This isn't difficult to clean but you must exercise care not to damage any components of the laser assembly. Unplug the unit. Remove the top cover. If the disc drive has a cover, remove it. You should see the lense, looks like a fish eye, looking up at you. The lense is monted on a set of springs and will move around as you clean it. This is normal but do not apply anymore pressure than necessary. The alcohol will do the work loosening the dirt. Using 200 proof grain alcohol, available from any electronic parts supplier (www.mcmelectronic.com) and commercial grade, lint free, cotton swabs, also available at MCM, moisten swab and gently touch the lense rotating the swab head. Use a dry swab after the wet one. Blow dry the assembly with canned air, also available at MCM. Reassemble unit and you should have a working player. If you still are not reading discs you could have a defective or weak laser assembly. This would have to be replaced with a new unit. I hope this has helped you. Let me know if you need any more assistance.

hardrocko

Thank you for using FixYa

Feb 13, 2010 | Denon DHT500SD System

1 Answer

Denon adv-500sd will not play discs!!


Manually cleaning the lens
To locate the laser lens, look around the door or drawer of the DVD player and you will see a small circular disc, which is often called the turntable or disc platter. Right off the edge of the platter you should see a small clear lens. There are some manufacturers that have had problems with the lens, depending on the age of the unit. In these problem players, moving the unit to a different location, turning the unit upside down, or sometimes even without moving the unit, the lens can become detached from the laser assembly and floats around inside the unit. You can re-glue it back with a little crazy glue, BUT it must be perfectly centered, and without getting any glue on it. So, if you don’t see the plastic lens, but instead see the laser pick-up assembly, look around for the lens inside the unit and glue it back on.
To clean the lens you must use very little pressure. Take a cotton swab and barely moisten it with plain, non-scented, or oily type alcohol. In a swirling motion, very gently rub the lens until you’ve covered it entirely. Then repeat using the dry end.
If the cleaning didn’t help, don’t despair just yet. You can see if there’s a problem elsewhere in the unit by using a few simple tricks and tips.
First thing you want to see if the unit’s laser is in good working order. This method isn’t foolproof, but most of the time works admirably. When you insert a disc, see if you can look up underneath where the disc sits on the turntable. Observe the laser lens going up and down. If the lens is trying to focus, that’s good! After a few seconds of the lens trying to focus, the platter should start to spin. On almost every CD/DVD unit I've encountered, the unit won't spin unless the laser has properly focused on the surface of the disc. If the unit spins up and and then shuts down, you should check and make sure the laser pick-up assembly slider mechanism is working without any obstructions and that the small chrome rail that it slides on is slightly greased. Don’t go overboard with the grease though, as too much can cause all sorts of problems.
The slider mechanism, depending on the age of the unit and the manufacturer, consists of the small chrome rail, a drive motor, a small gear assembly, and (in some units) a small belt that drives the slider unit via the motor. This small belt causes all sorts of problems. If the belt is broken or slipping, it can cause skipping, dropouts, or simply no start up at all. Also, if the belt breaks in the middle of the disc, the drive mechanism gets hair or dirt wrapped up into the gears, or the pick-up assembly doesn’t return to the start position (called home), the unit will (99% of the time) refuse to release the disc, causing it to become stuck inside the unit. There’s a little micro or leaf type switch located at home position that sometimes gets dirty or breaks and, causing this problem also.
If the disc starts to spin slowly and doesn’t come up to speed, the spindle motor that’s attached to the turntable platter is a common problem. There could also be a problem with the spindle motor driver controller IC or the power supply regulator that supplies voltage to the driver IC. If the disc starts to spin and then spins really fast, or stops and starts to spin backwards, your problem is the laser pick-up assembly or the servo control circuit. If you continue to have problems after cleaning and checking the other things listed above, you may have a problem with the player's alignment. Of course, one of the problems you'll face checking alignments on a DVD/CD player is that you’re going to need to use an oscilloscope on most of them. If you have the proper tools and equipment, the first thing to look at is the RF pattern of the unit while its playing. It should be a sharp and clear pattern. If it's dull and smeared, then the laser could be weak.
Also, in these units are very critical alignments called the focus/tracking gains and offsets. When these alignments are off, it can often cause intermittent troubles. As the unit ages and parts change value, so do these alignments, and will need to be checked. In my time as service technician repairing DVD/CD players, 65% of the laser pick-up assembles I have tested were good and only needed a small adjustment. Today's technology makes it unfeasible for a shop to hook up a DVD/CD player, and even some recorders, to their equipment and make these adjustments because of the cost involved.

hope this may help;


DON'T FORGET TO RATE;


Regards,
VOTIT

Jun 11, 2008 | Denon DHT500SD System

1 Answer

Does not recognise disc


Try to change the laser unitKSS-240A (opticals). In most cases problem solved. The "zik-zik" sound is made by the motors in the unit as the laser tries to read the CD.
Caution, after installing the new laserunit remove the short circuits on the laserunit itself. This it put there just to protect the laser from static energie faulure during repair.

Sep 25, 2007 | Denon DN-961FA CD Player

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