v To view the error LEDs on the system board and internal components, leave theserver connected to power.v You do not have to turn off the server to install or replace hot-swap fans,redundant hot-swap ac power supplies, or hot-plug Universal Serial Bus (USB)devices. However, you must turn off the server before you perform any steps thatinvolve removing or installing adapter cables or non-hot-swap optional devices orcomponents.v Blue on a component indicates touch points, where you can grip the componentto remove it from or install it in the server, open or close a latch, and so on.v Orange on a component or an orange label on or near a component indicatesthat the component can be hot-swapped, which means that if the server andoperating system support hot-swap capability, you can remove or install thecomponent while the server is running. (Orange can also indicate touch points onhot-swap components.) See the instructions for removing or installing a specifichot-swap component for any additional procedures that you might have toperform before you remove or install the component.v When you are finished working on the server, reinstall all safety shields, guards,labels, and ground wires.v For a list of supported optional devices for the server, see http://www.ibm.com/servers/eserver/serverproven/compat/us/.System reliability guidelinesTo help ensure proper system cooling and system reliability, make sure that thefollowing requirements are met:v Each of the drive bays has a drive or a filler panel and electromagneticcompatibility (EMC) shield installed in it.v If the server has redundant power, each of the power-supply bays has a powersupply installed in it.v There is adequate space around the server to allow the server cooling system towork properly. Leave approximately 50 mm (2.0 in.) of open space around thefront and rear of the server. Do not place objects in front of the fans. For propercooling and airflow, replace the server cover before you turn on the server.Operating the server for extended periods of time (more than 30 minutes) withthe server cover removed might damage server components.v You have followed the cabling instructions that come with optional adapters.v You have replaced a failed fan within 48 hours.v You have replaced a hot-swap fan within 30 seconds of removal.v You have replaced a hot-swap drive within 2 minutes of removal.v You do not operate the server without the air baffles installed. Operating theserver without the air baffles might cause the microprocessors to overheat.v Microprocessor 2 air baffle and DIMM air baffle are installed.v The light path diagnostics panel is not pulled out of the server.Working inside the server with the power onAttention: Static electricity that is released to internal server components whenthe server is powered-on might cause the server to halt, which might result in theloss of data. To avoid this potential problem, always use an electrostatic-dischargewrist strap or other grounding system when you work inside the server with thepower on.38 System x3650 M3 Types 4255, 7945, and 7949: Installation and User’s Guide
