Power Crossover Cable Replacement - Sun Microsystems Sun Fire E25K Service Manual

16.2.3.2 Installing the Power Shelf I
1. Install the new cable.
2. Secure the four (4 per cable) male jackscrews holding the power shelf I
assemblies to both the top of the power shelf assembly and the cable retaining
bracket.
3. Install the honeycomb EMI Filter panel and air plenum cover and secure with the
twenty-two (22) M4x30 panhead screws.
4. Power on the system.
See Section 16.3, "Powering On the System" on page
16.2.4

Power Crossover Cable Replacement

16.2.4.1 Removing the Power Crossover Cable
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 twenty-two (22) M4x30 panhead screws retaining the air plenum
cover, and remove both the plenum cover and the honeycomb EMI filter panel.
3. Remove at least three (3) center system board components and their associated
carrier plate assemblies from both the front and the rear of the system to allow
access to the cables below the lower card guide assembly.
Review the board set carrier plate instructions for proper handling. See
"Inserting a Board Set Carrier Plate" on page
4. Remove the two (2) lower fan trays and set aside.
See Section 4.2.3, "Removing a Fan Tray" on page
5. Reach inside the system, below the fan tray shelf, and release the four (two (2) per
connector) male jackscrews (front and rear) holding the 48 VDC power cable
assemblies (two (2) per side) to the two (2) power crossover cables.
See
FIGURE 16-10
16-12 Sun Fire E25K/E20K Systems Service Manual • April 2004
.
2
C or TopCap Cable
16-20.
10-2.
4-4.
2
C cable
16-8.
Section 10.1,