Midplanes
In a 3.5 inch hard drive configuration, two midplanes connect the system board to the 3.5 inch hard drive
backplane. In a 2.5 inch hard drive configuration, two midplanes connect the system boards the 2.5-inch
hard drive backplane for expander configuration.
Figure 72. Midplane connectors
1. 2x17pin control connector for power
distribution board 1
2. mini-SAS connector for system board 3 and
4 (hard drive 5 and 6)
3. mini-SAS connector for system board 3 and 4
(hard drive 1, 2, 3 and 4)
4. mini-SAS connector for system board 1 and
2 (hard drive 5 and 6)
5. mini-SAS connector for system board 1 and 2
(hard drive 1, 2, 3 and 4)
Removing the midplane
Prerequisites
CAUTION: Many repairs may only be done by a certified service technician. You should only
perform troubleshooting and simple repairs as authorized in your product documentation, or as
directed by the online or telephone service and support team. Damage due to servicing that is
not authorized by Dell is not covered by your warranty. Read and follow the safety instructions
that are shipped with your product.
1. Follow the safety guidelines listed in the Safety instructions section.
2. Follow the procedure listed in the Before working inside your system section.
3. Remove the system boards.
4. Remove the cooling fan cage.
Steps
1. Remove the screws that secure the middle wall bracket to the chassis.
2. Lift the middle wall bracket out of chassis.
3. Disconnect all the cables from the upper midplane.
Observe the routing of the cable on the chassis as you remove them from the system. You must
route these cables properly when you replace them to prevent the cables from being pinched or
crimped.
4. Remove the screw that secures the power cable cover to the upper midplane.
5. Lift it up straight from the locking hole on the upper midplane. Then, lift it completely out of the
upper midplane.
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