My Coolscan V went out of order about 15 month back. After ignoring him for that long, I finally gave it a final try and opened it. Some screws are hidden under the rubber feet.
Thanks to the nicely printed circuit board, I quickly found out where the fuse is. The specification on the board says T2AH 250V. Not really an electronic wizard, I however concluded after some internet checks, that this requires a 2A, 250V fuse, "träge" (don't know how to translate that in this context, maybe "slow").
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Then I discovered that Nikon has actually placed a 1A fuse in the socket, which was blown not quite surprisingly. After replacement with the proper fuse, the whole thing runs as it never had a problem.
Regards
Ivo