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6: Maintenance and Upgrade Procedures
Replacing IRU Components
While the individual rack units (IRUs) are not considered end-user replaceable, a number of their
internal components can be removed and replaced. These include:
• L1 controller panel
• IRU power supplies
• IRU cooling fans (also called blowers)
• IRU blades and their components
Remove and Replace the System Control Display Panel
To remove and replace either of the two power supplies in an IRU, you must first remove the
system control display panel. Use the following steps to remove the system control display:
1. Using a T10 torx driver, loosen the lower screw that holds the display panel to the IRU
chassis, see Figure 6-1 on page 111.
2. Lift the display assembly up about 1/3-inch (84 mm) and pull it outward from the IRU
chassis.
3. Don’t unplug the ribbon cable unless you are replacing the system control panel.
4. Let the control panel gently dangle and go to the section “Removing or Adding IRU Power
Supplies” on page 113.
5. Replace the applicable power supply and then use the following set of steps to replace the
system control panel.