The sharp AR 6020 it has been displaying this red light and caution light
The red light mean low toner , or you have to replace the toner sensor
Testimonial: "check your toner cartridge.And change your toner chip"
The Triangle may be the toner low light. On the older models it would look like a Triangle of stacked up cannon balls. I am not specifically familiar with your exact model.
I’m happy to help further over the phone at https://www.6ya.com/expert/ethan_e84416e0b13809d2
Testimonial: "change the toner sensor"
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