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There are special cleaning CDs with bristle hair attached.
You moist them with the special supplied liguid and put the cd in to play.As they spin they gently brush the lens and clean off any debris.
Otherwise you have to open the machine to do it manually with a microfibre cloth (GENTLY) and clear alcohol (JUST A DROP)...
If your CD's get scratched by being stacked on a table and shuffled around, you can often get them to play again with something like Skip Dr: http://www.amazon.com/SkipDr-Manual-Disc-Repair-System/dp/B0015ACUKC/ref=pd_sxp_grid_pt_2_0 You may also be able to take them into your local video or video game store and have them professionally resurfaced.
If the CD's are not scratched, and are commercially bought (ie. not cd's that you bought blank and burned music onto yourself) I would probably try contacting Bose.
The problem is in the laser pickup assembly, over a period of time the laser pickup becomes weaker until it can no longer track the cd properly causing skipping, and plays off and on. One possible solution "if the laser lens is accessible", you can try cleaning it with a Q-Tip and rubbing alcohol very carefully allowing several minutes to dry. If this fails, Bose will need to be contacted since they do the authorized repairs on their products.
This _might_ be caused by dust or dirt on the read lens of the CD player. The lens projects and reads a beam of light that is bounced off the surface of the CD surface to play the tracks.
Open the lid as if to load a CD. Remove any existing CD. Direct a short blast from a can of compressed air at the lens - or you could use a small artist's paint brush and gently wipe the surface of the lens to dislodge the dust, etc. Do not touch the lens with fingers. etc. as any oils will disrupt the light - and attract dirt and dust.
It sounds to me like the laser lens itself may be damaged or even broken.
Here is something you can try though, this might just work if the laser lens has some dust particles stuck to it. Just go to your nearest cd shop and buy yourself a laser lens cleaner disc, it is cheap.
Follow the instructions, and if the laser lens itself was dirty, this will help, otherwise the laser lens might be broken, which is a ver common problem, cause you used it for three years now.
HI.This will occur when the optical assembly becomes unstable. this ((Whole One Piece)), assembly incorporates the spin/load motor, optics housing /arm, tracking device and tracking rail. This is connected to the loading dock assembly. This 'NO Disc' or CD NOT PLAYABLE, code is the result of a failed or burned out lens. It is possible that you have a dirty lens cap. you can try using a cleaning disk in this case to confirm actual lens failure. if the cleaning doesn't restore normal reading capabilities, this will confirm my diagnosis.
You will need to have the optical assembly replaced in this case. once replaced, your unit will be able to read and track once more.