HP STORAGEWORKS SSL1016 Reference Manual page 152

Upgrading or Replacing the DCA
To remove the DCA:
1. Power off the autoloader.
2. Disconnect all cords and cables from the back of the DCA.
3. Remove the four screws anchoring the DCA to the chassis.
Figure 90: Removing the screws on the rear of the chassis
152 SSL1016 Tape Autoloader Reference Guide