What message appears on the display when the toner cartridge is running low or has reached end of life?
When the cartridge is nearing end of life, the display shows 'Prepare the toner cartridge.' When the cartridge has reached end of life, the display shows 'End of Cartridge Lifetime.' The remaining toner level can also be checked via Status Monitor > Device Information > Cartridge Information. (Page 32)
From the official Canon LBP1238 Ii Printer manual, page 32
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