Maintenance 3 - 7
Replacing the Fan Unit
A fan installed in either the left or right bays is rem oved or installed in
exactly the same manner as th e power supply. Follow the steps below to
replace a fan unit:
Caution: The concentrator must have two fans running at all
times to cool the unit. This is achieved through the
power supply fan and the fan unit that come sta ndard
with the concentrator, or by having two power supplies
installed.
1. Remove and save the four screws that attach the fan to the rear of
the concentrator as shown in Figu re 3-5.
Figure 3-5. Removing the F an Unit