Seiko Instruments SII Black-and-White Raster Plotter LP-1020 - Manual (Page 90)

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When limiting rolls to be used for operation to A0 and A1 rolls, for
example, the following process is recommended.
(1) Setting the apply roll
Set the rolls to be used to ON in the apply roll setting process (page 11-6).
Set the rolls not used to OFF.
When using only the A0 and A1 rolls, for example, set as follows:
Use A0 roll = ON
Use A1 roll = ON
Use A2 roll = OFF
Use A3 roll = OFF
(2) In case of no paper
If there is no paper when starting to print with this device, reloading of
paper will be prompted on the control panel. At this time, rolls which
have been set to OFF in the setting of apply rolls are not required.
(3) In case of optimum mode
When the auto supply mode is set to the optimum mode (page 5-12), a
roll which will leave the least wasted paper will be automatically selected
from the rolls having been set to ON in the apply roll setting process. If
the roll with the least remainder is not installed on the device, loading
paper will be required by the control panel.
Limiting rolls to be used