NEC 140He User Manual page 310

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5.
Make sure that the memory board power lamp goes off, then remove the memory board.
IMPORTANT:
removing the board, turn off the power and wait for several minutes before pulling it out.
Note that the hot-plug memory board is off-powered when it is unlocked (the LED goes
off). Wait several minutes in this state.
6.
Hold the ejector and pull the memory board out from the server.
The memory board becomes very hot while being powered. When