The DVD ROM reader in my in-car Navigation system is starting to get "read errors" the pickup laser/sensor is clean. I looked at the optical pick mechanism and it appears that there is some play on the head where it rides on a couple of rails. There are adjustment screws (factory adjustment) that align the pickup with the spinning disk, keeping it close, but not touching, the disk. I can tweak the adj screws to take out the play (looseness) , but then I would have to re-adjust the (alignment screws) clearance between the pickup and the disk.
So, does anyone know what the clearance between the pickup and the DVD disk should be?