VauWeh

Weiß nicht so recht. Ist es die Schraube, welches das Plättchen festhält? (im nächsten Schritt rot markiert?) Die war bei mir total fest. Das Plättchen muss halt leicht hin und her gleiten können, die Gleitflächen sollten gefettet werden. Ich würde es beobachten, wenn die Maschine sauber läuft ist ja alles gut. Die Schraube aus Schritt 7 sitzt in der Tat nicht so fest, ursprünglich ist sie mit einer Art Siegelwachs gesichert.

Glückwunsch zur Reparatur!

The guide is not a joke. Its main task is to be a prerequisite for other instructions.

Display adhesive from iFixit

There are three. Did you really lose all of them? Some grinders are not equipped with bearings.

There ist the lower connection to the drainage valve for the incoming hot water. There is also the upper connection that leads to the hose for the finished coffee. All possible other connections remain u, maybe they are used in other models.

First: I never worked on a 907D, so I might be wrong!

The most important part, which can be broken, is the triac BTA08-600CW, not the diac. If you want to replace the diac, use a DB3. The capacitor might be the 2.2uF, but I'm not sure. And yes, I don't expect a big difference between 901 and 907, so replace the resistor with 56 Ohm. (The resistor between diac and gate of the triac). The parts, which normally are broken are two capacitors and the triac, as sold e.g. here.

Try it, all parts are cheap. Good luck!

Strange, I never saw this before, a diagnosis without seeing it difficult. The induction magnet might be loose/broken? Perhaps buying an old used device, like this one, and replacing the parts would be the better solution?

Hola pakito, ¿Por qué no traduces directamente? En las instrucciones solo presione los tres puntos en la esquina superior derecha y elija "traducir".

Hmmm. Perhaps the circuit diagram here, step 9, helps. The transistor might have an issue ? The magnet? Good luck!

Look for the second picture in step 11. Are you sure, that the pin on the support of the circuit board is engaged in the guide rail on the knob (marked by the red rectangle in the second picture). If you turn the knob, you must watch the circuit board to move up and down a few millimeters!