Adjusting a Denon DP 35F

I recently bought a Denon DP 35F.
Everything seems to work fine apart from the fact that when I use the 'auto start' for 12" vinyl the arm does not go all the way to the record but starts to lower itself approx. 3 mm away from the edge of the record.
Is there a way to adjust this?
I did find three adustment screws / pot.meters under the platter.
Any ideas as to what they do??

Thanks for any info,

Denny