down the switch. All installed power supplies must blow air in the same direction and
must match the airow direction of the installed fan modules.
Warning
Be sure to disconnect all power cables before you disconnect the chassis
ground wire.
Warning
Make sure that the AC power supply circuit is not overloaded. Use proper
over-current protection, such as a circuit-breaker, to prevent over-current
conditions.
Replace an 800 W AC Power Supply
1. Disconnect the AC power cord from the wall outlet and from the power supply.
2. If necessary, remove a blank panel from the back of the switch.
3. Note the orientation of the installed power supply, and the location of the latching
tab at the right of the unit.
4. Verify that the new power supply's airow direction (front-to-back or back-to-front) is
compatible with the other installed power supply (if any) and with the installed fan
modules.
5. Push the latching tab toward the power supply handle and pull outward on the
handle to disengage the power supply internal connectors. See Figure 26.
Figure 26: Removing a 800 W AC Power Supply
6. Carefully slide the power supply all the way into the power supply bay (see Figure
27).
Replace an 800 W Internal AC Power Supply Remove and Replace Components
68 Extreme 7720 Hardware Installation Guide
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