Fujitsu PRIMERGY BX900 S1 Service Supplement Manual page 26

Replacing the midplane Replacement routines
Figure 9: Releasing the locking mechanism of the rear chassis
Ê Release the locking mechanism of the rear chassis by pressing in the
springs (1) on both sides.
Ê Put your fingers in the handle openings (2).
Ê Pull the rear chassis out of the system unit housing.
You install the rear chassis in reverse order.
26 Service Supplement
BX900 S1