: Linear regulators output a steady +12V DC for mechanical switching elements and +5V DC / +3.3V DC to power the main microcontroller. 2. Microcontroller & Sensor Array
What is your board currently showing (e.g., completely dead, looping, no display)? zd95gf schematic exclusive
Verify input voltages at the bridge rectifier stage. : Linear regulators output a steady +12V DC