Depending on the paper being used, the margins on the copy vary. You can shorten the leading/trailing edge margins.
To adjust the following settings, pre-register the type of paper in use as a custom paper. For details about registering custom papers, see "Specifying a Custom Paper", Preparation.
The adjusted margin cannot be applied to masked images that are solid-filled or contain ruled lines at the leading/trailing edges.
Reducing the leading/trailing edge margin may result in a paper jam on the fusing belt stripper plate.
In [Advanced Settings] for the custom paper, select 1245: [Erase Margin], and then reduce the value by 0.5 mm in [Leading Edge] or [Trailing Edge].
Keep reducing the value by 0.5 mm, checking that paper is not jammed.