The cartrige doesn't have a sensor to detect the presence of toner.
Instead there is a small reflector sticking out at the rear side on
new cartriges which retracts when you've installed the cartrige in the
printer for the first time.
regards
Jeff
Hello, I've been working on this problem for a while and just figured it
out. I have a magicolor 2350en, same cartridge.
Besides the printer sofware that needs to be set to continue rather than
stop when it detects an empty cartridge, you need to reset a small
rachette device in the end of the cartridge opposite of the refill end.
Here is a link to an article with photos:
http://www.consumablecafe.co.uk/acatalog/FAQ.html
Tried it and it works fine. Now I can go back to my other "empty"
cartridges and use all of the toner.