Samsung scx-4521F Scanner Problem and replacement

[@Flashy7]

I had a scanner error (scanner locked), and the cause was that the belt detached from the scanner head and it did not move. This video helped me fix it, although I did not have to disconnect the wires and remove the back and the sides, only lift the whole top with one hand and fix the belt with the other. A few plastic bits has broken off but no worries, it works now :)