Power Supply - IBM 7012 300 Series Installation And Service Manual

Power Supply

For Models 380, 390, 39H, and 397, refer to the procedure on page 3-18.
For a translation of the following notice, see System Unit Safety Information , Order Number
SA23-2652.
DANGER
Do not attempt to open the covers of the power supply. Power supplies are
not serviceable and are to be replaced as a unit.
Removal
1. Set the power switches of the attached devices to Off.
2. Set the power switches of the system unit to Off.
3. Remove the power cord from the electrical outlet first, then from the power supply.
4. Do the removal procedure in "Rear Cover" on page 3-3.
5. Do the removal procedure in "Top Cover" on page 3-4.
6. Do the removal procedure in "Front Cover" on page 3-6.
7. Do removal procedure in "Diskette Drive" on page 3-20.
8. Disconnect all power supply cables.
9. Remove the external diskette or Ethernet card.
10. Remove the ground strap screw at the planar.
11. Remove the power supply mounting screw.
Attention: On models 340 and 350, be careful not to damage the contact strip on the right
of the power supply.
12. Slide the power supply forward and out.
Aligning
Tabs
Ground Strap
3-16
Installation and Service Guide
P27 (Rear Fan)
P3 (Disk)
(May be present on
some systems.)
Front
Mounting
Screw
P26
(Front Fan)
P4 (Disk)
P2 (I/O Power Connector)
P25 (Power Control)