Same problem.
Quick disassembly of unit and clean the lens with a tissue.
This requires the circuit board and top plate to be removed after the cover is removed and the unit to be turned off with the disk platter draw slid out.
There is also a trim pot on side of lens holder that is used to adjust the laser output. amy need tweaking but note original position before attempting this adjustment.
Now works ok.
GRaham Lucas, December 2005
