IBM 7012 300 Series Installation And Service Manual page 76

Replacement
1. Ensure that the aligning tabs are not bent.
Attention: On later system units, those that have the slot under the power supply, be careful
not to bend the grounding fingers at the rear of the system unit when you install the power
supply.
2. Lay the power supply approximately 25 mm (one inch) in front of its installed position and
push it to the rear to engage the tabs with the slots at the rear of the system unit.
3. Install the power supply mounting screw.
4. Install the ground strap screw.
5. Install the external diskette or Ethernet riser card.
6. Connect the cables. For SCSI-attached drives, connect P3 and P4 directly to the drives.
Note: Ensure that P25 is properly connected to protect the memory cards.
7. Do the replacement procedure in "Diskette Drive" on page 3-20.
8. Do the replacement procedure in "Front Cover" on page 3-6.
9. Do the replacement procedure in "Top Cover" on page 3-4.
10. Do the replacement procedure in "Rear Cover" on page 3-3.
11. Plug the power cable into the power supply first, then plug it into the wall outlet.
12. Set the power switches of the attached devices to On.
13. Set the power switch of the system unit to On.
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Removal and Replacement Procedures