These scanners in Europe are rare and kind of expensive - I recall I paid about the same sum (~200USD) in the US back in 2008, and the US ebay scanners nowadays cost about a hundred plus another hundred for the delivery. I was thinking about purchasing v7***-v8***, which should be better than 4870, but we're talking about 400-800 EUR for a used scanner, so my repair was worth the effort
Coming back to your scanner - the main unit is the black box, which moves along the rails. I don't think one can do much if the internals of this box are damaged (the diagnostics with just one or two flashing LEDs is not that informative), but the squealing you mention can be checked and fixed. The upper lid is not fixed by screws, you just unplug it and lift it up. Beneath the hinges, there are 2 screws. Remove the cover with a glass panel, unplug the switch in front, and you can inspect the mechanism. It can be moved by hand, but gently and with the simultaneous rotation of the gears.
As for the light pad - it works, but one needs a strong source to override the reflection from the front surface of the film.
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