H3C Technologies H3C S5800 Series Switches - Manual (Page 13)

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Step3 As shown in Figure 4 , make sure that the power module is
placed in a correct vertical direction. The power module and
the power module slot are designed for avoiding upside down
installation. If the vertical direction of the power module is
incorrect, you cannot insert the power module completely into
the slot. Hold the handle of the power module with one hand
and the bottom of the power module with the other, and then
slide the power module along the guide rails into the slot.
When the power module is completely inserted into the slot,
you can hear that the latch of the power module clicks into the
slot.
Figure 4 Install the power module