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 for DC voltage across pin 3 of connector X10 and a suitable earth connection.
Expected voltage approximately 5.0 Vdc (see note).
Note.
Connector & pin numbers are printed on the PCB.