H3C Technologies H3C S12500 Series Switches - Manual (Page 9)

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Figure 8 Installing a power module (on an S12508)
5. Install other power modules by repeating steps 1 to 4, and close the power frame panel.
Figure 9 Closing the power frame panel (on an S12508)
Installing a fan tray
Each of the S12508 and the S12518 has two fan trays. They are installed in the same way.
To install a fan tray:
1. Remove the blank panel from the slot to be used.
Figure 10 Removing the fan tray blank panel (from an S12508)
2. Lift the fan tray and push it into the slot until it is firmly seated in the slot.