Did you unplug a connector on the developer unit ? It sits right under the toner cartridge, unplug and plug it back in if you did.
Make sure the white nylon gear, (it's inside the machine) that drives the cartridge isn't cracked/broken. Could you have put an empty cartridge in by mistake?
Manual....
http://usa.kyoceramita.com/americas/jsp/Kyocera/download_center.jsp
I didn't see a 1900 in the list are you in the USA?
( I have 2 FS -1700's in pieces, I'm assuming the 1900 is similar )
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