To reset the sensor after installing a new toner cartridge follow these steps.
1. With unit powered on open the front cover.
2. Press the "Options" key. Display will show "Replace Drum?"
3. Press "Start" key.
4. Press "+" key 10 times until the display reads 10.
5. Press "SET" key.
6. Display will show "Accepted" for approximately 2 seconds. Then display will change to "Cover Open".
7. Close cover and see if Toner Life End error message has gone.
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