Dell PowerVault 735N (Rackmount NAS Appliance) - Manual (Page 57)

Removing and Replacing Parts: Dell PowerVault 735N Systems Service Manual
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7. Loosen the thumbscrew on the SCSI backplane board (see Figure 16 ).
8. Slide the SCSI backplane board to the right (toward the center of the chassis) about 6.3 millimeters (a quarter-inch) and lift it off the L-
shaped mounting tabs on the hard-disk drive cage.
SCSI ID 4 Hard-Disk Drive SCSI Backplane
The SCSI ID 4 drive has a smaller SCSI backplane board on the back of its hard-disk drive cage.
Figure 17. Removing the SCSI Backplane from the SCSI ID 4 Hard-Disk Drive Cage
1 Fifth hard-disk drive cage
2 SCSI backplane
3 Screws (2)
To remove the SCSI backplane from the fifth hard-disk drive cage, perform the following steps.
NOTICE: See " Protecting Against Electrostatic Discharge " for information on protecting the system from electrostatic discharge.
1. Shut down the system and disconnect cables (see Protecting Against Electrostatic Discharge ).
2. If the optional plastic bezel is installed, remove it .
3. If you have not already done so, unlock and open the system doors .
4. Remove the fifth hard-disk drive and carrier from the hard-disk drive cage that is mounted in the peripheral bay.
5. Remove the ribbon-style backplane cable from the 10-conductor connector on the SCSI backplane.
6. Remove the 68-conductor SCSI cable from the fifth hard-disk drive SCSI backplane board.
7. Remove the DC power cable from the SCSI backplane board.
8. Loosen the thumbscrew securing the peripheral bay and slide the peripheral bay back 2.5 cm (one inch), then lift the peripheral bay
upwards and set it aside (see Figure 8 ).