Sun Microsystems Sun Fire E25K Service Manual page 177

7. Remove the eighteen (18) voltage-and-return DC power cables from the power
centerplane by loosening the captive screw of each cable while pulling back on
the lug.
8. Remove the seven (7) cross-slotted shoulder standoff nuts from the power
centerplane.
From the front of the system:
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1. Remove all system expander boards and the centerplane support board by
following the procedures in:
Section 12.2.3, "Removing an Expander Board" on page 12-5
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Section 11.2.3, "Removing a Centerplane Support Board" on page 11-4
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2. Remove fan tray F3, to access the lower two (2) remaining M4x8 Phillips screws of
the DC cable cover, and place on a flat sturdy surface.
See Section 4.2.3, "Removing a Fan Tray" on page
3. Remove the DC cable cover by removing the nine (9) M4x8 Phillips screws.
4. Remove the five (5) ribbon cable power control connections from the power
centerplane. See
FIGURE 15-1
5. From the cable tie-down panel beneath the power centerplane, disconnect the P0.9
six-wire friction-fit 48V power connector from J0.9 by depressing the end clips.
6. Remove the eighteen (18) voltage-and-return DC power cables from the power
centerplane by loosening the captive screw of each cable while pulling back on
the lug.
7. Remove the four (4) M4x10 panhead grounding screws from the power
centerplane.
The four grounding screws are only on the front side of the power centerplane.
8. Remove the seven (7) cross-slotted shoulder standoff screws from the front of the
power centerplane.
9. Remove the power centerplane and place on an ESD-protected surface.
.
Chapter 15 Power Centerplane Replacement Procedure
4-4.
15-5