I'm pretty sure it can only be aligned within Diagnostics, which requires a technician. But to very quickly and easily eliminate guessing on whether the margins are off, just lift the lid, select a paper tray to copy to and do a copy of nothing in a lit room.
The output will be a 100% black page, anything white is the margins, they should all be 4mm.
Make sure the trays are loaded correctly by type/weight as well as size, because not doing so will cause image shift and jams.
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