Brother 4000CN - Manual (Page 85)

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7.
Align the four corners of the paper
stack and insert the paper (print side
up) under the tab.
Look
Do not use paper that is folded,
creased, or heavily warped.
Make sure that all the paper is
under the tab.
Do not overload the paper tray.
8.
Align the side guides with the edges of
the paper.
Look
7
Pushing the paper guides too hard
against the edges of the paper stack
can cause a paper jam. However, if the
paper guides are too loose, the paper
may twist as it feeds through the
printer.
9.
Hold the paper tray with both hands,
align it with the opening in the printer
and gently insert it.
10.
Push the paper tray completely back
into the printer.
Look
8
Do NOT use excessive force on the
paper tray. Doing so could damage the
paper tray or the inside of the printer.