Xerox 4540 Service Manual - Page 182

4. Locate the DIMM slot on the CPU board on which you want to install or replace a DIMM. The DIMM fault LEDs in the DIMM slot ejector levers indicate which DIMM has failed. These DIMM fault LEDs can be lit for up to one minute by a capacitor on the CPU board. To light the fault LED from the capacitor, push the small blue button on the CPU board, labeled "Press to see fault." See FIGURE 3-23 for the locations. One end of the DIMM ejector levers contain LEDs that can indicate a faulty DIMM: ■ DIMM fault LED is off: The DIMM is operating properly. ■ DIMM fault LED is on (amber): The DIMM is faulty and must be replaced. The system designation of the DIMM slots on each CPU board is shown in FIGURE 3-23 (the X4500 system is shown-4 DIMM slots). FIGURE 3-29 Removing DIMMs on the CPU Board (X4540 shown) 5. Review the following list of memory configuration guidelines and the supported DIMM configurations listed in TABLE 3-16 before you remove or install any DIMMs. DIMM population rules for the X4500: 3-62 Sun Fire X4500/X4540 Server Service Manual • May 2010