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Lenovo ThinkStation P720 Hardware Maintenance Manual
Also see for 30BA: User guide
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Contents
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• 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.8. Check that the power-supply cover fasteners (screws or rivets) have not been removed or tamperedwith.Handling electrostatic discharge-sensitive devicesAny computer part containing transistors or integrated circuits (ICs) should be considered sensitive toelectrostatic discharge (ESD). ESD damage can occur when there is a difference in charge between objects.Protect against ESD damage by equalizing the charge so that the machine, the part, the work mat, and theperson handling the part are all at the same charge.Notes:1. Use product-specific ESD procedures when they exceed the requirements noted here.2. Make sure that the ESD protective devices you use have been certified (ISO 9000) as fully effective.When handling ESD-sensitive parts:• Keep the parts in protective packages until they are inserted into the product.• Avoid contact with other people while handling the part.• Wear a grounded wrist strap against your skin to eliminate static on your body.• Prevent the part from touching your clothing. Most clothing is insulative and retains a charge even whenyou are wearing a wrist strap.• Use the black side of a grounded work mat to provide a static-free work surface. The mat is especiallyuseful when handling ESD-sensitive devices.• Select a grounding system, such as those listed below, to provide protection that meets the specificservice requirement.Note: The use of a grounding system is desirable but not required to protect against ESD damage.4 P720 Hardware Maintenance Manual |
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