Dell OptiPlex 990 (Early 2011) - Manual (Page 35)

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Chassis Fan
Removing the System Fan
1. Follow the procedures in Before Working Inside Your Computer .
2. Remove the cover .
3. Remove the front bezel .
4. Remove the drive cage .
5. Remove the fan shelter .
6. Disconnect the fan cable from the system board.
7. Slide the grommets inward along the groove and pass through the chassis.
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