Set Appliance State:

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:

Measure the mains voltage between pins 3 and 4 on connector CN1.
Expect mains voltage.
Is the voltage measured as expected?
Note:
Number 1 for each mains voltage connector is indicated on the PCB with the numbering running right to left.