If anyone is interested, I have more information. I have disassembled the logic and have added lots of comments in an attempt to understand what it is doing. I have some partial schematics of the control board that I have traced-out (mainly to identify the I/O). Unfortunately, the logic has been written in a higher-level language, and was obviously structured very horribly to begin with. I am not sure I will pursue this problem (the problem is that the pump will not run even though the PCB circuitry seems to be working).

Hi! I have some problem as you posted here. In my PCB, pump semistor was be broken, after replacement, pump would't start on power on( EEPROM clearing need?)

Hello , I'm starting in this profession, I have 5 volts that appear from the capacitor and the resistance, but I don't understand how the 45 volts appear, you can explain to me, how this 45 voltage appears, thanks

Hello good, I'm starting in this profession, you can have the 5 volts that appear from the capacitor and the resistance, I don't understand how the 45 volts appear, you can explain to me, how this 45 volt voltage appears

45 Вольт получается путем выпрямления сетевого напряжения с делителя на резисторах.

Диод на обратной стороне в районе слова "control".