To measure the voltage you will need a multimeter of any model; for adjustment, a thin flat screwdriver.
Set the multimeter to DC voltage measurement mode , or to the 20V DC measurement range (depending on the multimeter model).
Place the multimeter probes on the motherboard power connector . Read the value. The nominal voltage is 12.6V; during reboots/operation the reading must not drop by more than 0.5V.
If the reading is low (below 12V), adjust the motherboard voltage.
Adjusting the motherboard voltage — S / Milkshaker
The motherboard voltage is adjusted by turning the resistor screw on the step-down board above the motherboard:
Place the multimeter probes on the motherboard power connector , and with a thin screwdriver slowly turn the screw clockwise while reading the voltage. Bring it to 12.6V. ATTENTION! Do not exceed 13V! If you over-adjust, turn the screw counterclockwise.
Adjusting the motherboard voltage — Shaker Touch
The motherboard voltage is adjusted by turning the resistor screw on the machine's UPS board:
Place the multimeter probes on the motherboard power connector , and with a thin screwdriver slowly turn the screw clockwise while reading the voltage. Bring it to 12.6V. ATTENTION! Do not exceed 13V! If you over-adjust, turn the screw counterclockwise.