HP StorageWorks 9100 - Extreme Data Storage System Maintenance And Service Manual page 42

Lift up on the tab to release the latch, and then slide the cable management arm off to remove it.
11.
Lay the drawer on its side with the hard drive bays facing down.
12.
Remove the backplane cover plate.
13.
Item Description
1 Flushmount T-10 Torx screws
2 T-15 Torx screws
3 5/8-in T-15 Torx screws
Remove the backplane board:
14.
Remove the thumbscrews securing the backplane board to the drawer.
a.
Disconnect the LED panel cable.
b.
Removal and replacement procedures 42