Lenovo PB2-670M Hardware Maintenance Manual

Also see for PB2-670M: Hardware Maintenance Manual Safety, warranty & quick start guide User guide

Safety information5The purpose of this inspection guide is to assist you in identifying potentialunsafe conditions. As each machine was designed and built, required safetyitems were installed to protect users and service personnel from injury. Thisguide addresses only those items. You should use good judgment to identifypotential safety hazards according to the attachment of non-Lenovo features oroptions not covered by this inspection guide.If any unsafe conditions are present, you must determine how serious theapparent hazard could be and whether you can continue without first correctingthe problem.Consider these conditions and the safety hazards they present:• Electrical hazards, especially primary power (primary voltage on the framecan cause serious or fatal electrical shock)• Explosive hazards, such as a damaged CRT face or a bulging capacitor• Mechanical hazards, such as loose or missing hardwareTo determine whether there are any potential unsafe conditions, use thefollowing checklist at the beginning of every service task. Begin the checks withthe power off, and the power cord disconnected.Checklist:1. Check exterior covers for damage (loose, broken, or sharp edges).2. Turn 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 the frame ground.b. The power cord should be the type specified in the parts list.c. Insulation must not be frayed or worn.4. Check for cracked or bulging batteries.5. Remove the cover.6. Check for any obvious non-Lenovo alterations. Use good judgment as to thesafety of any non-Lenovo alterations.7. 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.8. Check for worn, frayed, or pinched cables.9. Check that the power-supply cover fasteners (screws or rivets) have not beenremoved or tampered with.Safety inspection guide