Check Toner Cartridge TaskAlfa 3510i

[CiroB]

Good morning,
I have a problem with a TaskAlfa 3510i.
As soon as it starts it reports error to check the toner cartridge.
I have replaced 3 toners (original) but it still reports this error.
I have replaced as per the technical bulletin the cartridge sensor present in the belly of the MFP.
I have replaced the engine board.
I have replaced the main board.
I have replaced the power supply board.
All did not lead to the resolution of the problem.
Any other suggestions?
Thank you.

[sparkycivic]

does the machine attempt to fill the developer at all before giving up or is the error immediate?
Is the machine in a smoky or dusty environment?

[CiroB]

The machine attempts to fill the developer after which the error appears.
The machine is currently stopped in our service center.

[dalewb74]

firmware updated?

[CiroB]

Firmware updated.

[sparkycivic]

try a developer.
also check that the developer is actually turning, same for the toner container by putting a mark on the drive gear.

[Fabio-1]

This problem is generated by the sensor opt and the sw push behind the toner. You can try to clean them or chance directly.

[marvin_PL]

This problem is generated by the sensor opt and the sw push behind the toner. You can try to clean them or chance directly.

Can I check this in u150?