Set Appliance State:

Mains Power Off
Set Multimeter to DC Volts Set meter to measure DC Volts
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Measure for DC voltage across pins 1 and 3 on
connector X2 at the PCB.
Voltage should be approx 5V DC.
Note:
Colour of wires may change but test points remain the same.