Set Appliance State:

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 the DC voltage between pin 4 (red) and pin 5 (black) on connector X6.
Expect approximately 5V DC.
Note:
Wires may be multicoloured.