REPAIR AND REPLACEMENT8-55Edition OneXC1000 Service3. Insert the four screws with the flat washers into the four outer loopsin the grill and into the outer flange of the fan assembly. Make surethat only the four outer loops touch the fan assembly.4. Place one of the nut-retainer brackets behind the outer flange on oneside of the fan assembly, as shown in Figure 8-28. Secure two of thescrews to the nut-retainer bracket.5. Place the other nut-retainer bracket behind the outer flange on theother side of the fan assembly. Secure the remaining two screws tothe nut-retainer bracket (Figure 8-28). Make sure that the fan-wireconnector is free from the grill and that it can reach the powerconnector on the XC1000 chassis.6. Tighten all four screws completely.7. Connect the fan-wire connector to the power connector on the XC1000chassis. The connectors are keyed to fit properly; do not force theconnection.8. Make sure that the fan begins to spin and that the air flow is directedinward at the front of the XC1000.9. Make sure that the XC1000 alarms turn off. If alarm LEDs are stilllit, contact the Octel Communications Technical Assistance Center.10. Close the cabinet doors.8.7 BACKPLANE REPLACEMENTReplacement procedures for the following backplane components aredetailed in sections 8.7.1 through 8.7.7: Main distribution board (cabinet 1) Cabinet 2 distribution board Optional ACP I/O interface board Temperature-sensor board Disk-drive-backplane bus-terminator board Disk-drive backplane Main backplane coverThe following tools are required to replace parts on the backplane: 2 flat-blade screwdrivers, small and medium 2 Phillips screwdrivers, numbers 1 and 2 3/ 16-inch hex allen wrench8.7.1 Replacing the Cabinet 1 Distribution BoardThe distribution board in cabinet 1 is the primary distribution board for adual-cabinet XC1000. For a single-cabinet XC1000, it is the only distribu-tion board. To replace a faulty distribution board in cabinet 1, perform thefollowing steps:SECTION 8.6 – 8.7
