Toshiba BA400 Series Key Operation Specification page 18

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Ribbon near end is detected depending on the diameter of unused
ribbon. 38 mm is equivalent to 30-meter ribbon and 43 mm is
equivalent to 70-meter ribbon.
Flashing: Ribbon near end state (*1)
(*1) The icon flashes at a 1-second interval (ON: 500 msec. OFF: 500 msec.)
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