Epson AcuLaser C8600 Reference Manual page 183

Image Optimum
When this mode is on, the quality of graphics is reduced. It
reduces the amount of graphics data when the data reaches the
memory limit, allowing complex documents to be printed.
Top Offset
Makes fine adjustments to the vertical printing position of the
page.
Caution:
c
Make sure that the printed image does not extend beyond the edge
of the paper. Otherwise, you may damage the printer.
Left Offset
Makes fine adjustments to the horizontal printing position of the
page. This is useful for fine adjustments when using the manual
feed mode.
Caution:
c
Make sure that the printed image does not extend beyond the edge
of the paper. Otherwise, you may damage the printer.
T Offset B
Adjusts the vertical printing position on the back of the paper
when printing on both sides. Use this if the printout on the back
is not where you expected.
L Offset B
Adjusts the horizontal printing position on the back of the paper
when printing on both sides. Use this if the printout on the back
is not where you expected.
Functions of the Control Panel
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