Audio Inovations Alto (old) problem

I have this CD player (the older one with tuner) that has a strange problem.
Upon inserting a disc the sled moves to approx. middle portion of the disc and tries to read the TOC from there.... Of course without success, reading: No Disc. (laser works, lens servo works) I tried it with another mechanism (KSS213C) from a working player, but the problem remains. Any idea? No documentation (service manual) is available from anywhere.
There are no adjusting trimmer pots (focus, tracking,etc.) on the PCB....
 
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