asked Feb 24, 2018 at 10:40am
Xerox Xerox Phaser 7750DN

ATC Failure - What does developer look like?

My Phaser 7750DN is reporting an ATC failure, code 12. The service manual troubleshooting procedure asks if the toner or developer is empty. I opened the developer housing, and there is a lot of dark material in it, but nothing I would call "beads".

How can I tell if there is developer in the housing or not? I'm not sure exactly what I'm looking for, or seeing.