If I remember right, it does come out whole CD length. Check timing and belt of tray.

Also, look here. I'm afraid you will have to do the motor as well. 

And no the tray doesn't come out all the way! But it does a bit more than that, say 2cm more - just checked that.

Ah Jaques have live example 🙂

You can help it with hand to see, it is robust. (if not pulled with both hands and feets)

I have sorted through a few in years past. Typically the problem are drawr mechanics, the belt or dirty optics. . There are also a pair of contact switches that are activated by the drawers that fault.

If the Cd motor is acting up usually it will still read but skip and stick or punt the CD back out ( act Weird)..

It all start with a thorough clean up and visual exam, Take plenty of pix. We are here to help.

She's not fully sorted out, but I did get her to read a CD.

I took the top off, plugged the unit in, and loaded a CD.  The mechanism which pushes up on the CD to clamp with the transport motor was not being activated.  I unplugged the unit and took the laser off.  I then manually moved the tray gears and noticed the gears still needed to rotate another tenth of a revolution or so to get to the end where the clamping mechanism would move up.

The photograph shows this position.

This photograph shows the position of the tray and gears after I manually turned them completely in the other direction.  There's a mechanical stop preventing the tray from going any further.  Seems like it should go further out, but maybe not.

Also, you can see where someone has been in here before - the gears are marked.

This photograph shows how far the gears turn when the unit is plugged in and the tray is ejected and then retracted.