Juniper EX9253 Hardware Manual page 122

The fan trays are hot-removable and hot-insertable field-replaceable units installed in the rear panel of
the switch. You can replace them without powering off the switch or disrupting switch functions.
CAUTION: You must replace the fan tray within two minutes of removing the fan tray
to prevent the chassis from overheating.
To install a fan tray in an EX9253 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 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 41: Installing a Fan Tray
NOTE: If you have a Juniper J-Care service contract, register any addition, change, or upgrade of
hardware components at
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.
Figure 41 on page
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