2232 C yellow toner keeps asking to add toner

[Rick]

This machine keeps asking for toner even thought I have changed it . In also vacuumed the toner tube to make sure there is no obstruction . Any ideas anyone ?

[Jomama46]

Check the pump. Make sure the developer is actually turning.

[Llama God]

Check to see whether the dev unit is full of toner when you pull the shutter open on it. If it is, it's the dev unit or the drive to that, if it isn't then it's the toner supply.

In short, I agree with Jomama.

[mowpro]

its most likly the pump. but check to make sure the black disk is in the hopper ive seen them missing and it will give you an add toner condision

[Copierdocisleofman]

Toner supply unit is probably faulty, if vacuuming out the tubes doesn't work, change the yellow toner supply unit.