Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove connector X25 from the PCB
Measurement:
Test 1:
Measure the resistance between each of the pins listed in the table below expect the values listed.
Test 2:
Measure the resistance between pin 3 (2 Reds) and Earth.
Expect open circuit.
Test 3:
Measure the resistance between of each of the pins listed in the table above and Earth.
Expect open circuit.
Measure the resistance between each of the pins listed in the table below expect the values listed.
| Pin | Resistance | 3 (2 reds) and 5 (Blue) | 121 ohms |
| 3 (2 reds) and 4 (Brown) | 121 ohms |
| 3 (2 reds) and pin10 (Green) | 121 ohms |
| 3 (2 reds) and pin 11 (Black) | 121ohms |
Test 2:
Measure the resistance between pin 3 (2 Reds) and Earth.
Expect open circuit.
Test 3:
Measure the resistance between of each of the pins listed in the table above and Earth.
Expect open circuit.
 pcb in situ.gif)
 connector x25.gif)
Isolate as per TOPs P4
and refit as necessary