Four-Slot Chassis - Foundry Networks Switch and Router Installation And Configuration Manual

Four-Slot Chassis

To replace a fan in a 4-slot chassis:
1. Power down the chassis and remove the power cables from the chassis power supplies.
2. Put on an ESD wrist strap and attach the clip end to a metal surface (such as an equipment rack) to act as
ground.
WARNING: To avoid risk of shock, do not attach the clip end to the air flow panel of the power supply.
3. Remove all 18 Phillips-head screws from the rear panel of the chassis.
NOTE: The fans on the rear panel are connected to the chassis backplane by wire cables. Be careful when
you remove the rear panel to avoid accidentally damaging the cables or connectors.
4. Unplug the fan cables from the backplane and set the rear panel on a workbench. If you do not need to
replace a fan in the fan tray mounted on the side of the chassis, skip to step 8; otherwise, go to step 5.
5. Loosen the two flat-head screws that fasten the side fan tray to the chassis.
6. Carefully pull the side fan tray out of the chassis and set the tray on a workbench.
NOTE: The fastener push-ons that fasten the fans to the fan tray may catch on the chassis. In this case,
gently move the fan tray from side to side as you pull the tray back to free it from the chassis.
7. Unplug the fan cables from the backplane and set the fan tray on the workbench.
8. Use the wire cutters to cut the tie wraps fastening the wires of the two fans together.
9. Gently use the wire cutters or similar tool to remove the four plastic fastener push-ons that fasten the failed
fan to the rear panel or fan tray.
NOTE: Be careful when removing the fastener pushons. They are reusable.
10. Remove the fan.
11. Align the new fan over the fastener holes on the rear panel or fan tray, then insert the fastener push-ons to
fasten the new fan in place.
12. Fasten new tie wraps around the wires to keep them neatly together and away from other components.
13. If you replaced a fan on the rear panel and did not remove the fan tray mounted on the side of the chassis,
skip to step 15; otherwise, go to step 14.
14. Gently reinsert the fan tray into the chassis and partially tighten both screws. Then tighten the upper screw,
then the lower screw.
NOTE: Make sure you tighten the upper screw first to properly align the tray in the chassis.
15. Plug the fan cables into the three-pin connectors on the backplane.
WARNING: When you connect a fan cable to a fan connector on the backplane, make sure the red wire in the
connector is on the right side of the connector. If you accidentally reverse the wires, the fan will not operate.
Also, make sure the fan cable connector is seated over all three pins on the backplane connector.
16. Align the rear panel over the rear screw holes.
17. Screw the 18 Phillips-head screws back in.
December 2000
Installing a Foundry Layer 2 Switch or Layer 3 Switch
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