Dell Precision R5500 (Early 2011) - Manual (Page 37)

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Power Distribution Unit
Removing the Power Distribution Unit
1. Follow the procedures in Before Working Inside Your Computer .
2. Remove the front bezel .
3. Remove the cover .
4. Remove the cooling shroud .
5. Remove the optical drive .
6. Remove the hard drive carrier .
7. Remove the hard-drive assembly .
8. Remove the SAS Backplane .
9. Remove the power supply .
10. Remove the control panel .
11. Remove the system fans .
12. Remove the removable fan bracket .
13. Remove the expansion card cages .
14. Release the cable clips leading to the Power Distribution Unit.
15. Disconnect CPU 1, CPU 2, SAS backplane and optical drive power connector.
16. Unroute CPU 1, CPU 2, SAS backplane and optical drive power cables.
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