Sharp AR 5516 F2 -40 error code

[ecoworld]

Hello
I have a sharp AR 5516 copy machine and getting F2-40 error code.
I have checked the toner motor, its working, i manually filled the developer unit with toner, but i'm still getting this error. How can I clear this error code. Where is the toner density sensor situated and how to check it.
Any help highly appreciated.
Thanks

[ivan123]

Sensor is on dv box
Check gears on dv box


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