Seiko Instruments SII Black-and-White Raster Plotter LP-1020 - Manual (Page 158)

6-6
BOTTLE MAINT.
In order to prevent the waste toner from accumulating unevenly in the
waste toner bottle, this device provides the maintenance function that
taps the waste toner bottle to level the waste toner when the specified
amount of print is executed.
Set whether this maintenance starts automatically or a message to prompt
you to perform maintenance is displayed. In the latter case, the
maintenance does not start unless the key is pressed.
: Default value
AUTO The maintenance of waste toner bottle starts automatically.
MANUAL The maintenance of waste toner bottle is started manually.