Figure 2-7. Unplugging the Fan Unit
Before you install the new power supply, check the label on the inside of the power supply bay that explains where each of the seven power leads from the power supply are connected in the concentrator chassis.
Power leads labeled P7, P8, and P9 fit in the back three raised connectors and they are “keyed” so they can be inserted only in the correct connector and only in one direction. Power leads labeled P10, P11, P12, and P13 fit in the front four recessed connectors and can be inserted in only one direction. These connectors are shown in Figure
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