DeLonghi magnetic s failures

Good morning . Does anyone know why my DeLonghi magnifica s coffee maker grinds few beans and consequently makes watery coffee ? To premise that sometimes it starts to work almost normally , but when I clean it goes back to not working anymore . I think there is a sensor that controls the amount of coffee the machine has to grind , but I do not know which one and . I have changed the two boards and have not solved it . Can anyone give me advice ? Thanks

Hello, a circuit board the size of a matchbox sits at the bottom of the brew drive. Reedplatine called, which could be defective. Is the drive spindle greased and the mounting of the brew group may only have a clearance of 3-5 mm. Otherwise, replace the nut. Grease best food genuine.
I would start by looking through the spindle and nut, then continue here: Empty the bean compartment completely and draw min ten cups of coffee.
Ignore the message Fill beans. Then fill the bean compartment again and see if everything settles down again.

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Thank you , I will try . As a printed circuit board there are 3 : the motherboard which I changed ; the board where the power and start control buttons are which I changed as well ; and a small printed circuit board which is attached to the worm screw and goes up and down together with the diffuser assembly . I think this is the circuit board you say , I haven't seen any others .... The nut you say , where is it located ?