Large capacitors in a machine can store up dangerously high voltages. Before handling or replacing them, drain off the charge.

A 20,000 Ohm (20KW) 2 watt resistor may be used.

Do not simply short out the capacitor terminals as this may perforate the thin foil plates causing the capacitor to fail prematurely.

A high voltage capacitor may store electricity at 600 V in a three phase electrical motor circuit. This is dangerous

NEVER attempt to work on a microwave oven unless it is unplugged

Make sure the capacitor is discharged before attempting any repair or service work as the capacitor in a microwave oven stores several thousand volts for quite some time after being switched off.