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Lenovo ThinkCentre M90q Hardware Maintenance Manual
Also see for ThinkCentre M90q: Setup guideSetup guide
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• Do not service the following parts with the power on when they are removed from their normal operatingplaces in a machine:– Power supply units– Pumps– Blowers and fans– Motor generatorsand similar units. (This practice ensures correct grounding of the units.)• If an electrical accident occurs:– Use caution; do not become a victim yourself.– Switch off power.– Send another person to get medical aid.Safety inspection guideThe intent of this inspection guide is to assist you in identifying potentially unsafe conditions on theseproducts. Each machine, as it was designed and built, had required safety items installed to protect usersand service personnel from injury. This guide addresses only those items. However, good judgment shouldbe used to identify potential safety hazards due to attachment of features or options not covered by thisinspection guide.If any unsafe conditions are present, you must determine how serious the apparent hazard could be andwhether you can continue without first correcting the problem.Consider these conditions and the safety hazards they present:• Electrical hazards, especially primary power (primary voltage on the frame can cause serious or fatalelectrical shock).• Explosive hazards, such as a damaged CRT face or bulging capacitor• Mechanical hazards, such as loose or missing hardwareThe guide consists of a series of steps presented in a checklist. Begin the checks with the power off, and thepower 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 measure third-wire groundcontinuity for 0.1 ohm or less between the external ground pin and frame ground.b. The power cord should be the appropriate type as specified in the parts listings.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 any alterations.6. Check inside the unit for any obvious unsafe conditions, such as metal filings, contamination, water orother liquids, or signs of fire or smoke damage.7. Check for worn, frayed, or pinched cables.Chapter 1. Important safety information 3 |
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