As a short intermezzo we take a look at the display which seems to have some kind of service port to gather information in case of a malfunction.

We flip it over, unscrew two small Phillips screws and discover the brains of this piece of modern coffee technology:

Renesas R5S72660W144FP 32-bit microcontroller

Macronix MX25L12835F 128Mb serial multi I/O NOR flash memory

Unisonic Technology MC34063A DC-DC converter

STMicroelectronics L7805CV 1.5 A voltage regulator

Oscillator