In this film, we’ll show you how to test and replace the power switch. If the machine does not start when you turn on the switch, this could be caused by a fault anywhere in the electrical supply system – it is not necessarily the switch.

To test the switch, first, disconnect the power. You can test it using the setting for continuity or resistance on the digital multimeter. Touch the prongs together. To get an initial reading, you will need to identify two terminals on the switch where the power cables attach. Make sure you make a note of which lever goes to which terminal.

You need to slide the cables off the terminal. Now you are ready to test the switch. This can be done with the switch in place or, as in this example, with the switch removed.

To test the switch first, put it on the ‘on’ position. Then touch the probs to each of the terminals. It doesn’t matter which way round you do this. You should get a tone from the multimeter or a reading to show continuity.

Next, put the switch in the off position and put the probes in the same place. This time, you should get ‘OL’ or another reading, showing there is no continuity. If you receive these readings, then the switch is working fine. If not, then the switch needs replacing or repair.

To do this, you gently prise the switch out of the casing using a screwdriver. Have a good look at it. If you can see something that can be repaired with glue or solder, then you can try that. Otherwise, you need to replace it with a new switch that is compatible with the machine.

Once the new switch is in place, you can put back the leads into the terminals. Make sure you put them back the correct way round.

When the new switch is in place, you can test it by turning on the machine.