I scroll with a DeWalt 788, and when I am done using it I release the blade tension and remove the blade from the top blade clamp. I leave the arm in the down position (I use "The Lifter" on my saw to hold up its arm).
I usually vacuum all of the sawdust off from it when I am finished, too.
I was very fortunate to get a Type 1 DeWalt that had only been used a few times for a very good price, so I try to take really good care of it, so that it will last me for a long time. I've greased the needle bearings with very high quality grease and keep the table well-waxed, also.