Well my RNS-E satnav has been on the fritz for some time, saying "Unreadable Disk".. so i asked a few questions on ASN, and then followed these simple instructions:-
Remove radio with relevant keys, take the top of with 2x big screws on each side & 3x small screws on the top, once lids of, you'll see drive (hopefully encased in a plastic clear housing, if not then this maybe why laser head is so dirty?), top left corner should have a little route through into mechanics too reach in with a very minimal damp tongue dabbed bud head & wipe the laser head which should be clearly seen in the middle round motor part, looks like a small glass eye as such, when wiped a few times, turn bud round & wipe again with the dry end, test unit in car with lid still off to make sure all ok & then re-fit accordingly.
And I was encouraged by how easy the removal looked on here: http://www.youtube.com/watch?v=r0LXQqf- ... re=related
Hey presto, all is good again... my first fix in over two yrs of ownership, that hasn't cost me money = one very happy goose
