21356741 System Fan 1 5 Orange Locking Knob2 System Fan 2 6 Model 6E33 System Fan 3 7 Service Access Cover4 System Fan LEDsReplacing a Hot-Swap System FanNotes:1. The Linux operating system does not support these hot-pluggable procedures. A system with Linuxinstalled must be shut down and powered off before installing a fan.2. This note applies only to systems running the AIX operating system. If a fan assembly is beingreplaced for a redundant failure, after the service repair action is completed, check the crontab file forany power/cooling warning messages. When a power or cooling error is encountered, AIX adds anentry to the crontab file to ″wall″ a warning message every 12 hours, to alert or remind the customerof the problem. Replacing the faulty part does not clear this crontab entry, so unless the crontab fileis edited to remove this entry, the customer continues to be reminded of the failure despite its havingbeen repaired. Use the crontab -l command to read the crontab file to determine if an entry exists.Use the crontab -e command to edit the file.To replace a hot-swap system fan, do the following:1. Pull up on the orange locking knob on the replacement fan to ensure that it is in the unlocked position.2. Align the fan with the slot in the fan tray assembly with the fan power plug over the connector.3. Place the fan into the fan tray.4. Press down on the fan to ensure that the power plug is connected.Note: The fan starts to run when the power plug connects.5. Press the locking knob down until you feel it lock into place.Chapter 9. Removal and Replacement Procedures 319
