I had this rushed a few weeks ago because my HL-2070N continued to refuse to operate each ~ 20 pages due to low toner error. However, unlike most laser printers, the print quality was still perfect at the moment - no streaks or blank spots. The problem is that the printer detects that it is nearing the end of the cartridge and refuses to continue, despite remaining toner.
Based on some searches online, it seems that the sensor is based on bright light in a ~ 1 / 4 "hole in the side that goes through the entire length of the cartridge. Cover the hole with black electrical tape is allowed me to print a hundred pages without any problems so far and still no sign that the toner is running low.
Therefore, it is good to have a spare on hand, but has not been necessary to install it.
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