MB21 (21 Slot) Chassis
MB21 Chassis Power Components
MB6 and MB21 Multichannel Chassis Installation Guide, v2.0, Issue 01
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MB21 Chassis Power Components
Replacing the F-MB21X-R Chassis Power Supply
The F-MB21X-R chassis is fully redundant. It can run using one or both PSUs. If using both, they share the load 50-
50. One PSU can power all 21 cards in the chassis.
Figure 16: F-MB21X-R Removable Power Supply Units (close-up view)
To replace the F-MB21X-R Power Supply:
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
5 to prevent ESD damage to the equipment.
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.
PSU Power AC On/Off Switches
AC Power Receptacles
PSU Alarm Mute button
PSU Power LED (green)
PSU Retaining Screws
