Denon DCD-1000 (schematics ?)

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A friend dropped of a Denon DC-1000 cd player that seems to have some little problems. Sometimes it plays well but with a little clicking sound on both channels, sometimes it plays without the clicking but skips quite a lot, sometimes several seconds of a track (even with new perfectly clean CDs.
I have inspected the circuit board and at two points the tracks are broken but this seems to have always been there. I would like to check this on the schematics but these turn out to be very hard to find.

If someone has a service manual that I could use or any other advice on how to deal with this problem, I'm all ears/eyes :)
 
I did notice that it wasn't sounding that good but as it is a from a friend I thought I might give it a go.
I noticed it has the older version KSS-121A laser. Is there anything that can be done or does the laser have to be replaced if he wants to continue using it ?
 
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