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how to remove components from the chassis, first from the rear and then from the
front:
■ Removing the Power Supplies on page 188
■ Removing the Fan Tray on page 189
■ Removing SCBs on page 189
■ Removing DPCs on page 190
Removing the Power Supplies
The power supplies are located at the rear of the chassis. Each AC power supply
weighs approximately 5.0 lb (2.3 kg) and each DC power supply weighs approximately
3.8 lb (1.7 kg).
Remove the leftmost power supply first and then work your way to the right. To
remove the AC or DC power supplies for each power supply (see
Figure 65 on page 188):
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 circuit breaker in the chassis above 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. Pull the power supply straight out of the chassis.
Figure 65: Removing a Power Supply Before Installing the Router
188 ■ Removing Components from the Chassis
MX240 Ethernet Services Router Hardware Guide