Checking the Toner Level
Overview
Even if there is no more toner remaining in the Toner bottle, since still there will be some toner remaining in the toner replenishment unit, printing will not stop immediately.
When the toner runs out in the Toner bottle, the Toner bottle indicator lights up yellow in [Consumable and Scrap Indicators] display area on [MACHINE] screen, and the following message is displayed.
[Please replace the toner bottle]
Toner bottle can even be replaced in the middle of the printing.
The following message is displayed in the on-screen information display area if the toner in the toner replenishment unit has run out.
[No toner / Please add toner]
The Toner bottle indicator lights up red in [Consumable and Scrap Indicators] display area on [MACHINE] screen, and the following message is displayed.
[Toner is used up Exchange toner bottle]
in the upper-right of a page, it turns into 
and is registered as a bookmark.