Nad 502 CD will not recognise and play CD every time
I have a similar problem to bert. I put a CD in my Nad 502 and it will not recognise the disc. The display shows "No Disk". When this happens it sounds like the disc isnt spinning or being read.
If I keep opening and closing the cd trayer it will read and play the CD sometimes but increasingly it will not read. On some occassions it will say "Error" (instead of no disc) and then I have to press the play button several times before it eventually plays. Curiously, it will play burned copies of the same CD's no problem and sounds fine.
Bert suggested that It was the CD lifting mechnism not lifting the disk high enough or something similar but he/she doesnt seem to have any replies. I havent taken the unit apart yet so im not sure whether this is the same problem. Im wondering whether theres a quick fix to this or whether I need to send it somewhere for repair.
Thank you for reading, please help.
When the CD player does play, it sound perfect and does not therefore appear to be any problem with the laser.
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Re: Nad 502 CD will not recognise and play CD every time
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, or misaligned loading mechanism. 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
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The blue lines you mention should flash when trying to find the 'Table of Contents' of your CD, even if a CD isn't loaded. If when a CD is loaded and these lines flash for a while without any CD info e.g track no. / disc length then it's more likely that a problem has occurred with the laser. Various NAD CD players use the Sony KSS-213 Laser unit and for some reason particularly with NAD CD players, they tend to drift out of calibration over time so what i usually do when i come across this is very finely adjust the pot trim on the laser itself and testing a CD between adjustments.
Given that the machine will read disks it has written itself but not play regular discs, I suspect the lens assembly is slightly out of alignment and needs adjusting. This is not normally something you can do at home unless you have the correct test gear. It will need to go to a repair shop.
One thing you can try before that is to clean the lens. Buy a quality (Scotch 3M, Philips ) cleaning disc and try it. Could be it's only a speck of dust on the lens.....
Try this: 1) Disconnect the powercord from the plug!! 2) Remove the cover 3) Reconnect the powercord, turn on the power and press eject. 4) Turn of the power - beware, there is still power on the trafo!! 5) Now you have to carefully clean the laser (round glas-like item in the middle of the drawer) with a cotton swab filled with isopropyl alkohol. 6) Then wait at least 1 minute. 7) Turn the power on again and try to play a cd. If it works as it should then you have succesfully repaired your cd-player :-) Otherwise you may try again. 8) Now disconnect the powercord and replace the cover.
If this doesn't help I'm affraid you have to turn it in to your local shop for further invistigation and repair...
well, typical problem i nad cd players, and also receivers by the way.
The proble are tha nad use standard glow lamps. And as we know, the blow!! And often when you move around with the cd. Well i do have repair note for this one also.
go to the menu: 'amplifier repair notes' (yes includes cd players ;) )
Here you can find free amplifier repair notes, an go fore nad 705 repair fix (same fault with defect bulb's as in you nad cd)
And also a technical repair movie showing you the hole process of the 'workaround' this fault i NAD 522 (NAD 501, 502, 512 and more)
best regards michael miguelovitch
I think you can bye new laser here http://www.pltv.org.uk/laser.htm
I have a nad 5300 monitor series, same laser as 5100, you can buy the hole cd player from http://www.miguelovitch.dk Laser work, but problems with cd transport. When i 'help' the cd transport, cd play as expected. And i agree, it is a nice cd player, also i have heard lot of nad cds on quad 405, sounds realy good.
Try to visit my site, i also have a lot of free schematic for nad, denon, quad and mora. Also repair notes for amplifiers, tech videos, diy schematics and more..
Also at this moment i am working on a new 'nad cd service movie) including cleaning, maintenance, repair and more on nad 522, 501, 502 c521 and more
best regards michael miguelovitch
found same problem with mine, solution .. place clean paper over the optic, then a magnet, leave for a few seconds, the build up of static causes a magnetic field in the optic preventing it tracking, have cured a few other brands with this as well .. shows manufactures are putting inferior parts in to their players, hope this helps !!