Users Guide

support.dell.com Installing Redundant Power Supplies B-1
APPENDIX B
Installing Redundant Power
Supplies
This section includes instructions on upgrading your system with dual, redundant hot-
plug power supplies and a power-supply distribution board (PSDB).
WARNING: Before you perform the procedures in this section, you must
turn off the computer and disconnect it from its AC power source. For more
information, refer to
"Safety First—For You and Your Computer" in
Chapter 7.
WARNING: Do not remove the cover from the PSDB. No user-serviceable
parts are inside this assembly.
Installing the PSDB
To install a PSDB in the computer, perform the following steps.
NOTICE: See "Protecting Against Electrostatic Discharge" in the safety
instructions.
1. Remove the front bezel and both computer covers.
2. Disconnect the AC power cable from the AC power receptacle on the back of the
power supply.
3. Remove the two screws at the front edge of the top cover (see Figure B-1).