Epson AcuLaser C8600 Reference Manual page 302

Your computer may not be
properly connected to the
printer.
The interface cable may not be
plugged in securely.
You may not be using the
correct interface cable.
Some error may have
occurred.
Your application software is
not properly set up for your
printer.
Your computer system's
memory is too small to handle
the volume of data in your
document.
300 Troubleshooting
Perform the procedure described in
"Connecting to the Computer" in the
Setup Guide.
Check both ends of the interface cable
between the printer and the computer.
If you are using the parallel interface, be
sure to secure the connector using the
wire retaining clips.
If you are using the parallel interface,
make sure that the cable is a
double-shielded, twisted-pair interface
cable no more than six feet in length.
If you are using the USB interface, use a
Revision 1.1 compliant cable.
Check the LCD panel to see if an error
message appears.
Make sure that the printer is selected in
your application software.
Try reducing the image resolution of
your document in the application
software, or install more memory in
your computer if you can.