| 摘要 |
When it has been estimated that there is substantially no toner remaining in a toner supply unit based upon the amount of toner that has been supplied from the toner supply unit, a supply roller for supplying toner from the toner supply unit to a developing unit is rotated by a prescribed amount. After the supply roller has thus been rotated, a user is notified of the fact that no toner remains in the toner supply unit.
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