3Com NETBuilder II Installing Instruction page 21

4 Disconnect the cables that connect the power supply to the backplane and to
the floppy disk drive, and remove the chassis screw as shown in Figure 1-11.
Disk drive
a
Disconnect power supply cable
connection to disk drive.
b
Remove chassis screw.
c
Disconnect two power
supply connections
to vertical connectors
on backplane.
Figure 1-11 Disconnecting Power Supply Cables in the 4-Slot Chassis
5 Slide the power supply toward the front of the chassis, and lift it out.
6 Slide the new power supply in place and secure it with the chassis screw.
7 Reconnect the cables to the backplane and the floppy disk drive.
As you are reconnecting the cables, make sure you keep the connector keys
aligned.
8 Reinstall the cover.
a Position the cover slightly behind the front of the chassis.
b Lower the cover and slide it toward the front of the chassis so that it
engages the front panel.
c Secure the cover with the screws you removed earlier from the back and
sides of the chassis.
9 If your system was previously mounted in a rack, reinstall the rack-mount
brackets on the chassis and remount the system.
10 Make sure the power switch is off (O is pressed down). Plug the power cord
into the power supply and the outlet.
11 Turn on the system.
Front panel
Power supply
Maintenance and Repair
Back panel
1-11
Backplane