Transparencies On Epson 1670 Scanner Under Windows 7?

I'm trying to scan transparencies for the first time after connecting my Epson 1670 scanner to a Win7 PC. It takes a good preview scan of the whole assembly but not the individual slides as on my old PC (so the cables connecting to the PC and the scanner head still work OK).

I checked the Help, and the document cover's cable seems to be connected OK too (I never had an Auto Film Loader), but the options for transparencies don't appear in the menu.

Before I start testing with an XP laptop, which will need the driver installed, or fiddling with alcohol on the connections, does the Win7 driver for the Epson 1670 in fact support transparencies?