VauWeh

The “official” way is not to disengage the glasspanel. As you can see in step 7 the panel is held by two locks. It´s really difficult, but you can open them using a very long screwdriver. Lay the device on one side, there are openings on the bottom in which you can insert the scrwedriver and hopefully find the two locks…

And: be shure that the beans are dry! Wet beans bake together, and the grinder will not work anymore.

I could fix it easily by reinserting the helix as I described above! Be sure the taps fit in the groove of the drive shaft.

This morning I replaced the grindstones in a J5 and - had the same issue. Fill beans error. Using the toilet paper tube I could see the grinder spinning, but nearly no coffee grounds falling into the brewing unit. So I took off the helix and inserted it again. I'm sure, it was misaligned. There ist a groove in the drive shaft and two taps in the lower end of the helix have to fit in! If this ist not the case, the distance between both grindstones is not correct.

I remember this issue, when I forgot to insert the feeding helix…

Did you adjust the grinder as described in step 10? Did you watch the coffee grounds using the empty roll of toilet aper?

So my guess is the “Fill-Bean-Sensor", consisting in an infrared LED and a photocell. You can see it in the bean funnel on top of the mill. Perhaps you disconnected it while ?

Which model of Jura is it?

No, why? A rotary ump and 15 bar? Puuh…

Das Problem ist, dass Microsoft das Laufwerk und die Hauptplatine “verheiratet" hat. Man kann also nur ein Laufwerk mitsamt der zugehörigen Hauptplatine austauschen.

1,8 cm is the length of the screw. Security Torx f a center pin, so you need a tip with a corresponding hole. Try 10, 15 or 20.