CRU replacement for 2U chassis 117• Use a portable field service kit with a folding static-dissipating work mat.If you do not have any of the suggested equipment for proper grounding, have an authorized technician install thepart. For more information about static electricity or assistance with product installation, contactsupport.lenovo.com, select Product Support and navigate to Storage Products.CRU replacement for 2U chassisNOTE: Unless noted otherwise within a passage pertaining to a particular CRU, the replacement procedureshould be completed within two minutes of the removal of the defective module.Replacing a power cooling moduleThis section provides procedures for replacing a failed power cooling module (PCM). Illustrations in PCMreplacement procedures show rear panel views of the enclosure, with the PCM properly oriented for insertion intothe rear panel of the enclosure.A single PCM is sufficient to maintain operation of the enclosure. You need not halt operations and completelypower-off the enclosure when replacing only one PCM; however, a complete orderly shutdown is required ifreplacing both units simultaneously.CAUTION: Do not remove the cover from the PCM due to danger from electric shock inside. Return the PCMto your supplier for repair.See CAUTION bullets regarding electrostatic discharge and anti-static protection on page 116.TIP: The illustrations show PCM module replacement within the right slot as you view the enclosure rear panel.To replace a PCM in the left slot, you would first rotate the module 180º about its longitudinal axis, so that itproperly aligns with its connectors on the back of the midplane. See also Figure 16 (page 27).Removing a PCMCAUTION: Removing a power supply unit significantly disrupts the enclosure’s airflow. Do not remove thePCM until you have received the replacement module. It is important that all slots are filled when the enclosure isin operation.Before removing the PCM, disconnect the power from the PCM by either the mains switch (where present) or byphysically removing the power source in order to ensure your system has warning of imminent power shutdown. Afaulty PCM must be replaced by a fully operational PCM within 24 hours. Ensure that you correctly identify thefaulty PCM before beginning the step procedure.1. Stop all I/O from hosts to the enclosure. See also “Stopping I/O” (page 128).TIP: This step is not required for hot-swapping. However, it is required when replacing both PCMs atonce.2. Use management software to shut down any other system components necessary.
