We all know that there's tons of life left in toners when they say they're empty.

found this while browsing...


"Am using Brother HL-5170 DN and a TN-540 toner cartridge. The printer decided it was out of toner, even though the last page printed was fine. Rather than run out for a new toner cartridge I used a small (.5 x .5 in.) piece of black electrical tape to cover the sensor hole on the non-gear side of the cartridge. By covering the hole the printer is fooled into thinking the hopper is full of toner"


Thought it might be useful to others....