Jura F50 - Motor blocked for brewing group

I bought a cheap used F50 with only 2.800 covers. Immediately after commissioning I noticed that the motor of the brewing group always runs in one direction "up to the stop" and then hums for about 5 seconds without any further rotation. Only then is he driven out of that obvious blockade-position again.
Until now, I thought this was normal, because it seems that only the relatively high continuous current in this blockade position
recognizes that the press plunger has reached the end position.
The machine now has around 4,000 covers behind it and has always been well maintained (cleaning & descaling). Suddenly during the rinsing process, which is triggered when the machine is switched off, the machine blocks and I hear how the teeth of a gear wheel obviously jump over with loud rattling. Of course I immediately
disconnected
the machine from the
power supply and opened it for maintenance.
The large white gear wheel of the brewing group was in the uppermost position "completely at the stop". Then I dismantled the brewing group attachment so far that I could turn the white gear wheel manually without the long gear wheel shaft meshing. It did run a little sluggish at the point where the coffee press container swivels in. Otherwise the whole way over no excessive resistance of the piston or the mechanics was to be felt. The red
sealing rubber in the brewing group was
also
flawless.
Now I noticed a small electronic component with four supply lines on the angular gear of the brewing group drive. It was only held with a clamp. When I took it off, I noticed that it had a multi-tooth sleeve that was used to rotate something inside it.
Now

you can count the pulses of a rotary encoder either with a counter and thus determine where the start and end positions of the piston are in the brewing group. Or one simply evaluates whether it provides impulses or not. If it does not deliver any more, although the motor gets power, the end position must be reached or the piston is stuck in the cylinder.

In

both cases, the electronics should switch the direction of rotation and, if the pulses continue to fail, switch off the motor and

detect and signal a fault. In

any case, if such a component is present, the motor must not

growl in

a position

that blocks it! Questions: Is
this error
known?

And is it then to be assumed that the encoder

is

defective

?

If it was broken, where can I get a

new one?

I guess the engine mount broke. It's a known problem. There are repair plates on Ebay or a new engine.
The part with the cables you mean is the encoder. He counts the impulses to know in which position the brewing unit
is standing,
as you have already guessed correctly
.