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How to clean optical pickup assembly's lens on Denon S-102

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Posted on Jan 02, 2017

VOTIT
  • 2071 Answers

SOURCE: Denon 500SD dvd wont play

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

Posted on Jan 11, 2009

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Clean the optical pickup lens. Use a lens cleaning disc. If it do not help you, replace the optical pickup unit.

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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.

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This is basically a problem with the optical pick up. Try wipe it with dry cotton wool. If this does not work, change the optical pick up altogether. Make sure you replace with similar part.

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Spray an small drop of safe window cleaner onto a Q-tip. Clean the laser lens carefully and then use the other end of the Q-tip to dry it. Use compressed air on and around the laser lens (do not blow on it). Clean your DVD disc and try again. If it fails again, try using a CD, if it will play a CD and not a DVD your optical pickup assembly is defective. If the CD wont play at all, your optical sled or spindle motor and/or drive is defective.

Most cases if cleaning doesn't fix it, it's cheaper to replace the entire DVD player. All portable DVD players are junk, regardless of brand.

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How do you use a NEXXTECH Laser Lens Cleaner?


The NexxTech Laser Lens Cleaner uses six super-soft brushes to ensure thorough and reliable cleaning, without harming the delicate optical components of your disks. Enjoy your DVDs more and improve your music archive by cleaning your optics in your CD or DVD ROM. The easy-to-use audio instructions walk you through the cleaning process from start to finish. This laser lens cleaner process will prolong the life of your disc player, improve visual clarity and sound quality. Features
  • Works on CD, DVD, Blu-ray - all optical drives
  • The six brush system cleans off the entire laser lens
  • Will not damage sensitive optical components
  • Includes easy-to-use audio instructions

How to Clean the Laser Pickup Lens on your DVD Player X missing_author_image.png eHow Electronics Editor This article was created by a professional writer and edited by experienced copy editors, both qualified members of the Demand Media Studios community. All articles go through an editorial process that includes subject matter guidelines, plagiarism review, fact-checking, and other steps in an effort to provide reliable information. By an eHow Contributor

Is your DVD player malfunctioning? If you're getting a no-disc error, you may need to clean the DVD player's laser pickup. The laser pickup is what reads DVD's and allows you to view them on your TV. If you need to clean the laser pickup lens on a DVD player, follow these simple steps.
Difficulty: Moderate Instructions things you'll need:

  • Isopropyl alcohol
  • DVD lens cleaner
    • 1 Make sure the laser pickup lens is actually the problem. There are a wide variety of reasons that a DVD player might not read a disc efficiently. The disc could be scratched or dirty, for example. Test the DVD player with a disc that you know works before trying to clean the lens.
    • 2 Purchase or borrow a lens cleaner disc and try it first. You can find these things really cheap at any large department store. They usually get the job done well. However, you may need to clean the lens manually if the store-bought cleaner fails.
    • 3 Remove the outer casing of the DVD player. Remove the screws that mount the top casing onto the bottom of the DVD player and slide the top casing off. This will expose the DVD deck, which houses the laser pickup lens.
    • 4 Find the lens. The lens will be glass and under the DVD clamp. The lens will probably have a blue tint to it. If you are having trouble finding the lens, you could shine a light on the components and watch for the reflection.
    • 5 Use a cotton swab and some isopropyl alcohol to gently wipe the lens. Just a quick scrub will do. Dry the laser pickup lens with the other end of the swab.
    • 6 Give the lens a few seconds to dry and replace the covering of the DVD player. Test the efficiency of the player. If necessary, repeat the process.

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1 Answer

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chances are the lens on the optical pickup is dirty and needs cleaning. you can blow out any dust with canned air and use a lens cleaning disk to clean off the lens. they sell them at any electronics store. if that doesn't work or the disk doesn't spin at all, you'll have to replace the optical pickup assembly or the whole cd player..

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1 the optical pickup assembly's lens may be dirty and needs to be cleaned (donot use any liquid to clean the lens just a soft cotton swab will do)
2 the optical pickup assembly has failed and can no longer read discs (if the laser or sensors inside the optic fail it is "blind" and can not "see" the disc)
start with the cleaning.

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try to replace the data bus(ribbon) running from the pickup lens to the motherboard, that may the problem before replacing the lens ,NOTE that lens faulty is not easy.

name ;emanuel mollel
mobile;255757566502
TANZANIA, IT student

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