Hello,

You need to lubricate the disc motor. It’ll solve this.

But this is not for the faint-hearted, just a drop of oil won’t do.

Hello as Jacques said it is quite some work when you need to "service" a CD50. If I recall correctly there is a thread which describes how to change the belt of the CD50 which I found very helpful in order to dismantle the whole mechanism and reach the most intimate parts of the CD50.😁 I would suggest that  you also have a belt just in case you need to change it.

To me it sounds like a problem with the tracking.
After the first 4-7 playing seconds comes the first movement of the laser block on its rails.
If the tracking mechanism has to much play or runs rough for some reason, or if the laser block moves with a wrong amount of friction on its rails, the
resulting movement of the laser block will be "jerky".

This will be particularly expressed from the beginning of the disc, because the last
movement of the laser block at this time, gears mesh etc. was in the other direction.

Martin

Tassos wrote:

Hello as Jacques said it is quite some work when you need to "service" a CD50. If I recall correctly there is a thread which describes how to change the belt of the CD50 which I found very helpful in order to dismantle the whole mechanism and reach the most intimate parts of the CD50.😁 I would suggest that  you also have a belt just in case you need to change it.

The belt is already changed. I'm quite familiar with the CD50 and have seen all gears already.
Also, if the belt is bad this would cause other problems. Slow opening/closing of the tray, and slow or no lifting of the CD.
So servicing has already been done but the problem stays

Dillen wrote:

To me it sounds like a problem with the tracking.
After the first 4-7 playing seconds comes the first movement of the laser block on its rails.
If the tracking mechanism has to much play or runs rough for some reason, or if the laser block moves with a wrong amount of friction on its rails, the
resulting movement of the laser block will be "jerky".

This will be particularly expressed from the beginning of the disc, because the last
movement of the laser block at this time, gears mesh etc. was in the other direction.

Martin

I think you are right but I did already clean the old grease and regreased the carriage and the tracking mechanism (wormgear and gears). I will check the parts again, 

Thanks

You were right Martin.

I disassembled the carriage again and cleaned and regreased the whole bunch of gears and gliding parts again.
Tested it with several discs, and it looks like the problem is solved. (holding my breath and hoping it really is)

Thanks again
Eddy