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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:
Arrow points horizontally toward back of chassis
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 103, 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 (if you are REPLACING a bad fan, you
should have recorded where each cable attaches to the foam; if you are ADDING a fan, see
Figure 34 on page 104).
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 (if you are REPLACING a bad fan,
you should have recorded where each cable connects to the front panel; if you are ADDING a
fan, see Figure 34 on page 104).
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.
105
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