Gateway 7210 System Manual page 83

6
Pull the backplane out to the side of the chassis, then toward the back
of the system to remove it from the retention hooks.
7
Lift the backplane out of the chassis.
8
Set any jumpers on the new backplane that are required for your SCSI
configuration. (See "Hot-plug backplane" on page 11 for instructions.)
76
Replacing and Adding Internal Devices