IBM Power Systems 9009-41A Manual page 97

Figure 82. Replacing a fan in the system
11. Replace the disk drive backplane.
• If you have a base function disk drive backplane, complete "11.a" on page 83 through "11.c" on
page 85.
• If you have a 12-drive expanded function disk drive backplane, complete "11.d" on page 86
through "11.f" on page 88.
• If you have an 18-drive expanded function disk drive backplane, complete "11.g" on page 89
through "11.i" on page 91.
a) The chassis has two alignment pins and several brackets (A) to secure the disk drive backplane.
Using the disk drive backplane touchpoint (B), thumbscrew (C), and alignment pins (A), insert the
disk drive backplane into the chassis as shown in the following figure.
Slide the disk drive backplane to the side in the direction that is shown so that the backplane
cutouts slide under tabs in the chassis.
Removing and replacing the system backplane in the 9009-41A, 9009-42A, or 9223-42H 83