MB21 Power Components

The F-MB21X-R chassis is fully redundant. It can run using one or both PSUs. If using both, they share the load 5050. One PSU can power all 21 cards in the chassis.

The PSU Power LED will show red to indicate an issue with the PSU. When this occurs, you should replace the power supply.

Caution

Refer to "Antistatic Precautions" in Safety Information to prevent ESD damage to the equipment.

To replace the F-MB21X-R Power Supply:

1. Turn off the PSU to be replaced. The alarm will sound.
2. Press the Alarm Mute button to cancel the alarm.
3. Lift the AC cable retainer wire.
4. Unplug the power cord from the PSU.
5. Using a Phillips #2 head screwdriver, remove the screw next to the power receptacle. Pull out the unit by the handle.
6. Slide the new PSU back in.
7. Tighten the screw.
8. Plug the power cord back in.
9. Return the AC cable retainer wire to position.
10. Turn on the power switch.

The F-MB21B-R chassis is fully redundant. Three out of four PSUs are required to power all 21 cards in the chassis.

Note

The F-MB21B-R chassis fan tray is fixed and cannot be removed.

The PSU Power LED will show red to indicate an issue with the PSU. When this occurs, you should replace the power supply.

Caution

Refer to "Antistatic Precautions" in Safety Information to prevent ESD damage to the equipment.

To replace the F-MB21B-R Power Supply:

1. Turn off the PSU to be replaced. The alarm will sound.
2. Press the Alarm Reset button to cancel the alarm.
3. Using a Phillips #2 head screwdriver, loosen the two captive panel screws (one on each side of the module). Pull out the unit by the handle.
4. Slide the new PSU back in the chassis.
5. Tighten both captive panel screws.
6. Turn on the power switch.