Set Appliance State:

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

Measurement:

Test between mains neutral and top middle connection of on/off switch (brown wire)
Is mains voltage present?
Note:
On some appliances the incoming terminal strip is located differently and has been rotated through 180° from the one shown.