Attention:Do not attempt to lift any objects that weigh more than 16 kg (35 lb) or objects that you think aretoo heavy for you.• Do not perform any action that causes hazards to the customer, or that makes the equipment unsafe.• Before you start the machine, ensure that other service representatives and the customer's personnel arenot in a hazardous position.• Place removed covers and other parts in a safe place, away from all personnel, while you are servicingthe machine.• Keep your tool case away from walk areas so that other people will not trip over it.• Do not wear loose clothing that can be trapped in the moving parts of a machine. Ensure that your sleevesare fastened or rolled up above your elbows. If your hair is long, fasten it.• Insert the ends of your necktie or scarf inside clothing or fasten it with a nonconductive clip, approximately8 centimeters (3 inches) from the end.• Do not wear jewelry, chains, metal-frame eyeglasses, or metal fasteners for your clothing.Remember: Metal objects are good electrical conductors.• Wear safety glasses when you are: hammering, drilling, soldering, cutting wire, attaching springs, usingsolvents, or working in any other conditions that might be hazardous to your eyes.• After service, reinstall all safety shields, guards, labels, and ground wires. Replace any safety devicethat is worn or defective.• Reinstall all covers correctly before returning the machine to the customer.CAUTION:Hazardous moving parts. Keep fingers and other body parts away.CAUTION:Before you open the computer cover, turn off the computer and wait several minutes until thecomputer is cool.Electrical safetyCAUTION:Electrical current from power, telephone, and communication cables can be hazardous. To avoidpersonal injury or equipment damage, disconnect the attached power cords, telecommunicationsystems, networks, and modems before you open the computer covers, unless instructed otherwisein the installation and configuration procedures.2 Lenovo S510 Hardware Maintenance Manual