NEC Express 5800/320Lb - Manual (Page 264)

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Replacing DIMM
Follow the procedure below to replace the failed DIMM.
57. Identify the failed DIMM using the Data Viewer of the NEC ESMPRO Manager.
58. Remove the CPU module.
59. Replace a DIMM
60. Install the CPU module.
61. Boot the CPU module using the NEC ESMPRO Manager or ft server utility.