I buy a used technics sl-pg480a cd player and after i inserted a cd, there is "no disc" on display...i try with different cd's (mp3, avi,...) and it's always the same...i have opened a box and what i saw, is that the cd is not turning...today i buy a cd cleaner and it's the same words "no disc"...i have read some posts, but cannot find a solution...if anyone knows what's the problem

This player will not play either MP3 or MP4 encoded CdRs. It is a good 18 years old now and such things were unforeseen back in the day. The newer sony may well be MP3 compatible. You could convert MP4 to standard audio types on your pc via any number of software applications.

Don't know this issue with this particular player, but have had other Technics (Matsushita, Panasonic...) CD players doing something similar to this. In most cases, those were carousel players instead of single disc players like yours. These units had optical sensors that determined the presence of CDs in each tray slot by determining whether light was blocked from its LED to its sensor when a disc was present... no light at sensor meant that there was a CD in the slot. The sensors interpreted a shadow as an indication of a disc in the tray. I've had these sensors fail and not be able to determine that a disc was blocking its light signal... the players didn't "see" discs so they wouldn't play them. Solutions varied, but cheapest, easiest solution was often to open the player and blind the sensor completely with a piece of black electrical tape. Most of these sensors I have encountered got too sensitive, so that any light at all inside the player was seen as an empty slot. Blinding the sensors "fixed" most of these players, but disabled the ability to really tell that any given tray slot was empty.
Or, since it is an old player, there is also the possibility that it has simply run its course and the laser assembly has failed.

Good Luck.

GET NEW RCA JACKS

TRY A LASER LENS CLEANER,,ALSO TRY BLOWING IT OUT

TRY NEW RCA JACKS AND TRY BLOWING IT OUT,,GET YOU A LASER LENS CLEANER

TRY A LASER LENS CLEANER,,CHANGE UR RCA JACKS TOO

it will need a manual cleaning of the laser lens

this player uses a philips mechanism, spindle motor failure is very common on these mechanisms, yours may be on its way out. take the lid off and insert a cd and if you can hear the laser trying to read the cd without it spinning, it's definately the spindle motor.

This maybe due to overheating of some Sort.
Try taking it out of where it is where theres a good flow of air.
Then try running a cd.
Try Putting in a Cleaning cd, this maybe a fault with the laser.

Regards

Im pretty sure this is to do withthe laser, try using a cleaning cd, put your head next to the player and listen to if the actual disc is moving inside.
this might evan be a problem with the cd motor.

Regards