Sharp UP-600 - Manual (Page 113)

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UPC delete
You can delete the UPC codes which have not been accessed during the period you set in this program
when you execute the delete job while in UPC DELETE in the X1 mode.
Program each item as follows:
• PERIOD (DAY) (Use the numeric entry)
Enter the UPC record delete period: 01 to 99 (00: Not
delete by the non-accessed deleting job)