I'd like to take apart a Canon 4200F Scanner that I bought at a thrift store. There are three screws near the lid hinge, which I removed, but I can't see any other screws. I'm wondering if the top part of the scanner just slides off. I can pry it a little way with a screwdriver at the other end of the scanner, but I don't want to put so much force on it that I break something. Any ideas? Thanks.
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