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1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist and
connect the strap to one of the ESD points on the chassis. For more information
about ESD, see “Preventing Electrostatic Discharge Damage” on page 130.
2. For an AC-powered router, switch the AC switch on the power supply slot to the
off position (O). For a DC-powered router, switch the circuit breaker on the power
supply to the OFF position.
We recommend this even though the power supplies are not connected to power
sources.
3. Using both hands, slide the power supply straight into the chassis until the power
supply is fully seated in the chassis slot. The power supply faceplate should be
flush with any adjacent power supply faceplate or blank installed in the power
supply slot.
4. Tighten the captive screws.
Figure 70: Reinstalling a Power Supply
Reinstalling the Fan Tray
To reinstall the fan tray:
1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist and
connect the strap to one of the ESD points on the chassis. For more information
about ESD, see “Preventing Electrostatic Discharge Damage” on page 130.
2. Grasp the fan tray on each side and insert it straight into the chassis. Note the
correct orientation by the "this side up" label on the top surface of the fan tray.
3. Tighten the captive screws on each side of the fan tray faceplate to secure it in
the chassis.
194 ■ Reinstalling Components in the Chassis
MX240 Ethernet Services Router Hardware Guide