SP-300v Sheet Cut Assembly
This can be caused by a few things. With the SP-300v, the way it sheet cuts is when it engages on the left hand side of the machine the wheel pushes down on a plate. The pressure the plate puts on the wheel keeps the blade down until it reaches the other side of the machine. If the plate is not level on the left it would cause this problem. If the sheet cut assembly is damaged (not straight, spring lost, lever broken) then it would cause this too. In both scenarios, we'd recommend contacting a Roland authorized dealer to look at the printer.
Hope this information helps.
Feel free to PM or call our Technical Support Department at 1-800-542-2307 and Press "1".
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Robert Ozankan
Senior Product Manager - Color Products
Roland DGA