IBM CS821 Service Manual page 38

Figure 19. Replacing a fan
3. Replace the fan holder into the chassis. Align the holes in the fan holder with the pins in the bottom
of the chassis as shown in Figure 20 on page 23. For the fan holder near the cover switch, temporarily
move the cover switch wires out of the way. When the fan holder is seated into the system, replace
the wires next to the fan holder.
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Power Systems: Servicing the IBM Power System S821LC (8001-12C) or the IBM CS821 (8005-12N)