OKI C3200, C5100, C5150: How do I resolve a Toner Sensor Error ?

The solution is : Clean up!.

First, clean the toner cartridge, its drum unit, especially the toner sensor located on the the lock blue lever.
Reinsert them into the machine. If this solution is not solved then take them out (all of them: C, M, Y,K), even image and fuser unit, do a clean up  inside the printer. Remember clean 4 laser beam units above (at the back the top cover).
I am going to throw away about 7 toner and drum cartridges, but after trying this trial, everything is OK now.
I want to share with you my experiences.

Good luck …

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