Set Appliance State:
Mains Reset Switch OFF
Set Multimeter to DC Volts 
Isolate Mains Power to appliance as per TOPs P4
Gain access to PCB (use insulation mat as necessary)
Gain access to PCB (use insulation mat as necessary)
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Observation:
Mains reset switch on.
Measure the voltages on the test pins below the J13 connector on the main PCB.
The Voltages should conform approximately to the table below:
Measure the voltages on the test pins below the J13 connector on the main PCB.
The Voltages should conform approximately to the table below:
| Black Probe Position | Red Probe Position | Expected DC Voltage | Earth | Pin 4 | 5 |
| Earth | Pin 6 | 12 - 17 (see note) |
Isolate as per TOPs P4
and refit as necessary