To rotate the toners:
1 press the down arrow until reset menu appears press the right hand arrow once
2 Scroll through the menu until change toner appears.
3 Toner C appears first continue scrolling until you reach the desired toner eg K for black then.
4 Press the right hand button and the red light will appear on yhe main button.
5 Open front door and change toner.
Works for me after hours of searching. Hope it works for you.
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