Lenovo ThinkServer Storage SA120 (English) User Guide and Hardware Maintenance - Page 44

Notes: • Use product-specific ESD procedures when they exceed the requirements noted in this topic. • Ensure that the ESD protective devices you use have been certified (ISO 9000) as fully effective. When you handle storage array parts and components, take these precautions to avoid static-electricity damage: • Limit your movement. Movement can cause static electricity to build up around you. • Always carefully handle the parts and other components by edges or frame. Do not touch solder joints, pins, or exposed circuitry. • Do not leave the device where others can handle and possibly damage the device. • Before you replace a new part, touch the static-protective package containing the new part to an unpainted metal part of the storage array for at least two seconds. This reduces static electricity from the package and your body. • Remove the new part from the static-protective package and directly install it in the storage array without placing it on any other surface. If it is hard for you to do this in your specific situation, place the static-protective package of the new part on a smooth, level surface, and then place the new part on the static-protective package. • Do not place the part on the storage array cover or other metal surface. • Take additional care when handling devices during cold weather. Heating reduces indoor humidity and increases static electricity. • Use a grounded work mat to provide a static-free work surface. The mat is especially useful when handling ESD-sensitive devices. • Prevent the part from touching your clothing. Most clothing is insulative and retains a charge even when you are wearing a wrist strap. • The use of a grounding system is recommended. Ensure that you work in an ESD-safe area. Select a grounding system, such as those listed below, to provide protection that meets the specific service requirement. - Attach the ESD ground clip to any frame ground, ground braid, or green-wire ground. - When working on a double-insulated or battery-operated system, use an ESD common ground or reference point. You can use coax or connector-outside shells on these systems. - Use the ground prong of the ac plug on ac-operated storage arrays. System reliability guidelines To help ensure proper cooling and system reliability, strictly follow these guidelines: • Each of the drive bays has a drive or a dummy drive tray installed; or there is an electromagnetic interface (EMI) protective panel or EMI shield installed to protect the drive cage. • Each of the power supply bay has a power supply installed, or one bay has a power supply installed while the other bay is covered by a shield. • Leave adequate space around the storage array to ensure that the storage array cooling system works well. Leave approximately 50 mm (2 inches) of open space around the front and rear of the storage array. Do not place objects in front of the fans. For proper cooling and airflow, install the storage array cover before you turn on the storage array. Operating the storage array for extended periods of time (more than 30 minutes) with the storage array cover removed might damage storage array components. • Ensure that you replace a failing fan assembly to avoid overheating problems. • When replacing a hot-swap drive, install the new hot-swap drive within two minutes of removal. 32 ThinkServer Storage SA120 User Guide and Hardware Maintenance Manual