Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
Gain access to PCB (use insulation mat as necessary)
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Test 1:
Measure the AC voltage between the Brown wire at the mains input connector on the PCB and a suitable Earth point.
Expect 240v AC
Test 2:
Measure the AC voltage between the Blue wire at the mains input connector on the PCB and a suitable Earth point.
Expect 0-15v AC
Measure the AC voltage between the Brown wire at the mains input connector on the PCB and a suitable Earth point.
Expect 240v AC
Test 2:
Measure the AC voltage between the Blue wire at the mains input connector on the PCB and a suitable Earth point.
Expect 0-15v AC
Isolate as per TOPs P4
and refit as necessary