There are silver wire contacts on the left and right that are spring-loaded and touch on copper tabs on the cartridge. They may not be making proper contact. Wiping with some contact cleaner ona cloth may help, or failing that try brightening the surfaces with some fine Scotchbrite pad to help them make proper contact.
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this means that the toner chip on the black cartridge is defective and theres really nothing you can do other then get another black toner to replace it with. some companies do sell the chips but probably easier to return where you bought it and get a new one to replace it. The company ,if reputable shouldnt charge you for another one but just exchange it with a working toner... Please mark as FixYa! if this helped...Get Paid To
After I figured this out, it was quite easy to resolve. Remove the toner cartridge from the drum cartridge. Remove the black plastic cover on the left side of the toner cartridge (3 Phillips screws). There is a "flag", which is a small plastic tab on the outer side set to the right at about 2 o'clock. Turn the gears until you fully reset the tab going counterclockwise to the 10 o'clock position (fully to the left). Reinstall the small black cover and the three phillips screws. And the idea to install black electrical tape over the small clear plastic windows on both sides is also a good idea to prevent the early and false message that the cartridge is empty. Make sure you do not allow that tape to get into the gears.
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.
You have replaced the toner cartridge but you still have to replace the imaging unit which is the drom that the toner cartridge attaches to.
Toner Cartridge OK, Low, Empty When 15,000
(high-capacity cartridge) or
cartridge) pages are
printed (5% print density).
Imaging Units At/Near end-of-life When 30,000 pages are
printed out or when the
pixel counts are
A fuse in the new
imaging unit will blow
resetting the counter.
Verify color calibration. Clean lenses.
Xerox Part Numbers
Standard Capacity Yellow 016-1975-00
Standard Capacity Magenta 016-1974-00
‘ Standard Capacity Cyan 016-1973-00
Standard Capacity Black 016-1976-00
High Capacity Yellow 016-1979-00
High Capacity Magenta 016-1978-00
High Capacity Cyan 016-1977-00
High Capacity Black 016-1980-00
Hope this helps
There are many problems like that and its not recommended to change toner from one printer to another. but you should try: put the old toner (emty) in again, then turn off the printer, change toner and turn on printer again. if thats not helping, then maybe you have a old FW so you can try to update the firmware.