Question about Audio Players & Recorders
I put it away 10 years ago with the rest of my Technics system. Decided to clean off the dust and plug it in. Basically, it won't recognise/play cd's anymore. I'm trying CDs I've purchased from shops. I open the cd tray, insert cd and then close the cd tray. Nothing happens, the cd doesn't spin. I recall having to open/close the cd tray several times before it eventually recognised a cd...
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: cd tray mechanics
It can be repaired but in all of my years in consumer repair, I dread the CD/DVD tray alignments the worst.
There are many things involved in getting them to operate without fail. Using the mfgs documentation you can get them up and running but most of the time they failed because something is amiss to begin with. So you spend an hour getting everything setup and it will work once or twice but them fail. Only to find out that a location sensor is bad or a gear is missing a tooth....
Posted on Nov 21, 2007
SOURCE: Not Recognising a CD
I got a second hand 541 a few weeks ago. After many hours of listening pleasure an no problems at all, the machine stopped spinning CD's, both copied ones and original ones.
The sollution for my problem was simple after some figuring out.
Open the CD tray.
Power off the unit with the tray open.
Open it up.
In the CD frame in the back there are 2 srews that hold the CD engine unit in place. I untidied these screws just a little bit.
I also untidied the screws that hold the cd clamp cover on the top a little.
After this it loads all my CD's fine again.
Posted on Feb 28, 2008
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
Posted on Sep 14, 2009
I've had the same problem with a denon ucd 70,had the laser replaced and still the problem remained.Finally it appeared that a little wheel which moves the laser over the disk was broken and therefore the entire system finally couldn't read any cd anymore It started with some cd's however.
Still looking for a replacement wheel and fear that I have to buy a full new laser unit
Posted on Feb 25, 2010
SOURCE: PD-H300 not recognising CD's
Firstly I'm an amateur so this is based on my opinions and all advice is without warranty. I had the same problem, no disk, just a clicking sound and no disc rotation. I removed the cover and attempted to clean the lens. This did work a little. The solution was a new laser unit a ? Sony ks-210a this unit was bought cheaply off eBay for eight pounds.
The spring that keeps the lens in position is made of plastic and fails with age, the laser ? lens cannot position in order to read the disc and if it can't read the disc it thinks there's no disk and that's why it doesn't spin it up.
Ok so now we know the reason let's change the part. Remove the case after disconnecting the unit from the mains leaving it for twenty minutes to ? discharge any capacitors. You will see the tray that holds the cd. Around the edge are four screws which engage with the metal case. Remove these and lift the rear end first to remove unit taking care to disconnect the four electrical connectors two on the side of the board and two on the rear of the laser pickup( red and White) note the position of the wires. Turn the removed unit upside down and you will see four springs held by small Phillips head screws. Remove these. The laser head is held by a sliding bar. Release this by moving the retaining clip to the side and withdraw the bar to remove the laser head. You may have to release the White cog which engages with the grooved slide on the laser head, to do this just pinch the rear of the shaft of the cog and withdraw it. Now for the new laser head, these are sensitive to static, so earth yourself ? by touching something metal ie, door handle to discharge any static. Position the new head and replace the slide bar, screw the four Phillips screws back down. Your almost done. The new unit has an anti static solder blob which protects the laser unit in transit, this has to be removed. You will find it behind the red and White connectors on the head at the bottom left hand corner of the laser head board. Carefully remove this with a soldering iron. Now fully reassemble. You should find for eight pounds or less you have a new cd player!?
Sent from my iPhone
Posted on Mar 07, 2011
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