Internal Cable Harness Set Replacement - Sun Microsystems Sun Fire E25K Service Manual

16.2.6

Internal Cable Harness Set Replacement

16.2.6.1 Removing the Internal Cable Harness Set
Caution – Be sure you are properly grounded before you begin the hardware
removal and installation. There are four ground points on the system cabinet, two at
the front top left and top right, and two at the rear top left and top right.
1. Power off the system.
See Section 16.2.1, "Powering Off the System for Cable Replacement" on page
2. Remove the system board modules and their associated carrier plate assemblies
from the front and rear of the system.
3. Remove the upper and lower fan trays from the front and rear of the system.
4. Remove the twenty-two (22) M4x30 panhead screws retaining the air plenum
cover, and remove both the plenum cover and the honeycomb EMI filter panel
from the front and rear of the system.
5. With a flat-blade screwdriver (if needed), loosen the jackscrews on the seven (7)
8W8 Combo-D 8-pin DC power connectors (on the left side of the power module)
and the two (2) DB-25 control connectors (on the right side) on the front and rear
of the system.
6. Using a 3/16 inch nut driver, carefully remove the two (2) nut screws and the
vertical bracket holding the internal harness set connectors to the fan backplane
on the front and rear of the system.
7. Unlock and remove the connector at J3 of the upper and lower fan backplane from
the front and rear of the system.
8. Depress the top and bottom clamp to remove the connector at J2 of the upper and
lower fan backplane from the front and rear of the system.
9. Remove the cable wireway cover by removing the sixteen (16) M4x6 panhead
screws (eight (8) per cover), on the front and rear of the system.
10. Remove the thirty-eight (38) (nineteen (19) per side) M4x6 panhead screws
retaining the black plastic cable cover attached to the center bulkhead on the front
and rear of the system.
11. Reach through the upper and lower card guide assembly and remove the grey
colored connectors attaching the I
(
FIGURE 16-12
16-16 Sun Fire E25K/E20K Systems Service Manual • April 2004
).
2
C fan cable to the four (4) fan backplanes
16-8.