Lenovo ThinkCentre 7515 Maintenance Manual

Also see for ThinkCentre 7515: User guide User guide Hardware Maintenance Manual

Contents

If any unsafe conditions are present, you must determine how serious the apparenthazard could be and whether you can continue without first correcting theproblem.Consider these conditions and the safety hazards they present:v Electrical hazards, especially primary power (primary voltage on the frame cancause serious or fatal electrical shock).v Explosive hazards, such as a damaged CRT face or bulging capacitorv Mechanical hazards, such as loose or missing hardwareThe guide consists of a series of steps presented in a checklist. Begin the checkswith the power off, and the power cord disconnected.Checklist:1. Check exterior covers for damage (loose, broken, or sharp edges).2. Power-off the computer. Disconnect the power cord.3. Check the power cord for:a. A third-wire ground connector in good condition. Use a meter to measurethird-wire ground continuity for 0.1 ohm or less between the externalground pin and frame ground.b. The power cord should be the appropriate type as specified in the partslistings.c. Insulation must not be frayed or worn.4. Remove the cover.5. Check for any obvious alterations. Use good judgment as to the safety of anyalterations.6. Check inside the unit for any obvious unsafe conditions, such as metal filings,contamination, water or other liquids, or signs of fire or smoke damage.7. Check for worn, frayed, or pinched cables.8. Check that the power-supply cover fasteners (screws or rivets) have not beenremoved or tampered with.Handling electrostatic discharge-sensitive devicesAny computer part containing transistors or integrated circuits (ICs) should beconsidered sensitive to electrostatic discharge (ESD). ESD damage can occur whenthere is a difference in charge between objects. Protect against ESD damage byequalizing the charge so that the machine, the part, the work mat, and the personhandling the part are all at the same charge.Notes:1. Use product-specific ESD procedures when they exceed the requirements notedhere.2. Make sure that the ESD protective devices you use have been certified (ISO9000) as fully effective.When handling ESD-sensitive parts:v Keep the parts in protective packages until they are inserted into the product.v Avoid contact with other people while handling the part.v Wear a grounded wrist strap against your skin to eliminate static on your body.6 Hardware Maintenance Manual