Working inside the server with the power on

•Take additional care when handling devices during cold weather. Heating reduces indoor humidity and increases static electricity.

Attention:

Static electricity that is released to internal server components when the server is turned on might cause the server to halt, which might result in the loss of data. To avoid this potential problem, always use an electrostatic-discharge wrist strap or other grounding system when you work inside the server with the power on.

The server supports hot-swap devices and is designed to operate safely while it is turned on and the cover is removed. Follow these guidelines when you work inside the server with the power on:

•Avoid wearing loose-fitting clothing on your forearms. Button long-sleeved shirts before working inside the server; do not wear cuff links while you are working inside the server.

•Do not allow your necktie or scarf to hang inside the server.

•Remove jewelry, such as bracelets, necklaces, rings, and loose-fitting wrist watches.

•Remove items from your shirt pocket, such as pens and pencils. These items might fall into the server as you lean over it.

•Avoid dropping any metallic objects into the server, such as paper clips, hairpins, and screws.

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.

Chapter 5. Replacing FRUs 41