IBM SY27-0345-06 - Manual (Page 71)

Replacing the Power Supply for 12x Models
Figure 4-25. Replacing the Corner Screws (12x Models)
1
Place the power supply on top of the insulator, being sure the regulator pro-
tection tab is perpendicular to the base of the unit. Replace the four hex
screws.
Chapter 4. Removal and Replacement Procedures 4-21