CAUTION: You can remove and replace the fan tray while the switch is operating.
However, you must replace the fan tray within two minutes of removing the fan tray to
prevent the chassis from overheating.
The fan tray in an EX9251 switch is a hot-insertable and hot-removable field-replaceable unit (FRU). You
can remove and replace it while the switch is running without turning off power to the switch or
disrupting switching functions.
To install a fan tray in an EX9251 switch (see
):
1. Wrap and fasten one end of the ESD wrist strap around your bare wrist, and connect the other end
of the strap to the ESD point on the switch.
2. Grasp the fan tray handle, and place one hand under the fan tray for support.
3. Place the fan tray on the respective slot, and carefully push the fan tray into the chassis until the
socket lock snaps into place and holds it.
4. Tighten the screw on the fan tray faceplate using the Phillips (+) screwdriver, number 2 to secure the
fan tray in the chassis.
Figure 52: Installing a Fan Tray in an EX9251 Switch
NOTE: If you have a Juniper J-Care service contract, register any addition, change, or upgrade of
hardware components at
https://www.juniper.net/customers/support/tools/updateinstallbase/
Failure to do so can result in significant delays if you need replacement parts. This note does not
apply if you replace existing components with the same type of component.
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