Before servicing the machine (especially when responding to a service call), always make sure that the power plug has been inserted completely into the power source. A partially inserted plug could lead to heat generation (due to a power surge caused by high resistance) and cause a fire or other problems.
Always check the power plug and make sure that it is free of dust and lint. Clean it if necessary. A dirty plug can generate heat which could cause a fire.
Inspect the length of the power cord for cuts or other damage. Replace the power cord if necessary. A frayed or otherwise damaged power cord can cause a short circuit which could lead to a fire or personal injury from electrical shock.
Check the length of the power cord between the machine and power supply. Make sure the power cord is not coiled or wrapped around any object such as a table leg. Coiling the power cord can cause excessive heat to build up and could cause a fire.
Make sure that the area around the power source is free of obstacles so the power cord can be removed quickly in case of an emergency.
Make sure that the power cord is grounded (earthed) at the power source with the ground wire on the plug.
Connect the power cord directly into the power source. Never use an extension cord.
When you disconnect the power plug from the power source, always pull on the plug, not the cable.
