Installing An Individual System Fan - Silicon Graphics 1400 Server Family Maintenance And Upgrade Manual

Chapter 1: Working Inside the System
26

Installing an Individual System Fan

Note: A general rule about correct airflow direction: The removable fan pulls air from
in front of the chassis so that it flows across the boards and out the back. Thus, the fan
must be oriented for the correct airflow direction. In general, the fan's label is on the side
from which air EXITS the fan. You can confirm correct orientation by checking the
embossed arrows on the side of the fan:
⇒
• The Arrow points horizontally toward the back of the chassis
⇑
• The Arrow points vertically up
Always note the direction of the arrows on the existing fan before you remove it. Replace
a failed fan with the same type as the one removed, with a tachometer signal, or an
approved fan. For a list of approved fans, contact your customer service representative.
1. See "Removing an Individual System Fan" on page 24, as necessary.
2. Observe the safety and ESD precautions at the beginning this chapter.
3. Slide the fan into its correct receptacle in the foam fan assembly.
4. Attach the cable to the foam at the correct places (when REPLACING a bad fan, you
should have recorded where each cable attaches to the foam).
5. Position the fan assembly inside the chassis so that the individual fan cables can
easily reach their connectors on the front panel board.
6. Attach the cable to the front panel at the correct connector (when REPLACING a
bad fan, you should have recorded where each cable connects to the front panel).
7. Position the fan assembly as it was inside the chassis prior to removal, so that it rests
firmly against the diskette drive at the top and the 5.25-inch bays at the middle and
bottom.
8. Reinstall the foam cover. It is molded to match the position of the fans and fits in
only one way.
9. Reinstall the access cover using the original screws.