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Chapter 6. Replacing FRUs
This chapter provides detailed instructions for replacing FRUs in the server.
Guidelines for trained service technicians
This section contains information for trained service technicians.
Inspecting for unsafe conditions
Use the information in this section to help you identify potential unsafe conditions in a Lenovo product that
you are working on. Each Lenovo product, as it was designed and manufactured, has required safety items
to protect users and service technicians from injury. The information in this section addresses only those
items. Use good judgment to identify potential unsafe conditions that might be caused by non-Lenovo
alterations or attachment of non-Lenovo features or options that are not addressed in this section. If you
identify an unsafe condition, you must determine how serious the hazard is and whether you must correct
the problem before you work on the product.
Consider the following conditions and the safety hazards that they present:
• Electrical hazards, especially primary power. Primary voltage on the frame can 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 hardware.
To inspect the product for potential unsafe conditions, complete the following steps:
1. Make sure that the power is off and the power cord is disconnected.
2. Make sure that the exterior cover is not damaged, loose, or broken, and observe any sharp edges.
3. Check the power cord:
• Make sure that the third-wire ground connector is in good condition. Use a meter to measure third-wire
ground continuity for 0.1 ohm or less between the external ground pin and the frame ground.
• Make sure that the power cord is the correct type.
• Make sure that the insulation is not frayed or worn.
4. Remove the cover.
5. Check for any obvious non-Lenovo alterations. Use good judgment as to the safety of any non-Lenovo
alterations.
6. Check inside the server for any obvious unsafe conditions, such as metal lings, contamination, water or
other liquid, or signs of re or smoke damage.
7. Check for worn, frayed, or pinched cables.
8. Make sure that the power-supply cover fasteners (screws or rivets) have not been removed or tampered
with.
Guidelines for servicing electrical equipment
Observe the following guidelines when servicing electrical equipment:
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