IBM 9040-MR9, Manual

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Figure 10. Partially removing the disk drive backplane
d) Pull the entire system unit out of the rack at most 20.3 cm (8 in), enough to access and disconnect
the SAS cables and to remove the disk drive backplane.
Do not pull out or install any drawer or feature if the rack stabilizer brackets are not attached to
the rack. Do not pull out more than one drawer at a time. The rack might become unstable if you
pull out more than one drawer at a time.
1) If not already removed, remove the shipping screws (A) as shown in the following figure by
using a Phillips screwdriver.
2) Release the side latches (B) by pressing them downward as shown in the following figure.
3) Pull out the entire system unit (C) at most 20.3 cm (8 in) from the rack as shown in the
following figure. Ensure that any cables do not catch or bind as you pull out the system.
12 Power Systems: System backplane