I have a Kyocera FS-3640MFP with a continual "adding toner" message, I removed the right cover and everything appears to be in place all the motors and gears seem to be turning. To rule out a maintenance kit, I took the developer unit and drum unit and swapped them into a 3540MFP and they work ( a little over-toned),however, no adding toner message. I took the FS-3540mfp drum and developing units and placed them into the FS-3640mfp and the continual "adding toner" message is on the LCD screen. The firmware I believe is current 0514 and no error massages. I did not see any tech bulletins. Any ideas?
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