Specifications

26
Chapter 1: Working Inside the System
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
mustbe orientedfor thecorrectairflow direction. In general,the fan’slabel ison theside
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
Alwaysnotethedirectionof the arrowsontheexistingfan beforeyouremoveit. 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 thecable tothe foam at the correctplaces (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 fanassembly as itwas inside thechassis prior to removal,so thatit 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.