Epson AcuLaser C8600 Reference Manual page 193

Note:
To activate Buffer Size settings, you must turn off the printer for
more than five seconds then turn it back on. Or, you can perform a
Reset All operation, as explained in "Reset Menu" on page 188.
Resetting the printer erases all print jobs. Make sure the Ready light
is not flashing when you reset the printer.
Functions of the Control Panel
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