Epson AcuLaser C8600 Reference Manual page 311

You may not be using the
correct type of paper for your
printer.
There may be a problem with
the photoconductor unit.
EPSON special paper or smooth,
high-quality copier paper is
recommended for best results. See
"Available Paper" on page 21 for
information on choosing paper.
Replace the photoconductor unit. See
"Replacing the photoconductor unit"
on page 263.
Troubleshooting
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