Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Gain access to PCB (use Insulation Mat as required)
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Measure the DC voltages between pins 1 (Black), 2 (Red),
3 (White) and 4 (Green) on connector X6 to a suitable earth point.
3 (White) and 4 (Green) on connector X6 to a suitable earth point.
Isolate as per TOPs P4
and refit as necessary