3Com NETBuilder II, Installing Instruction, Page: 42 / 82

2-14 C
HAPTER
2: NETB
UILDER
II 8-S
LOT
B
RIDGE
/R
OUTER
9 Reinstall the bracket containing the new floppy disk drive in the chassis.
a The three locking pins on the bottom of the bracket align with three keyhole
slots on the bottom of the chassis. Slip the pins into the wide part of the
keyhole slots.
b Slide the bracket toward the front of the chassis.
c Reinstall the two screws that secure the disk drive bracket to the faceplate.
10 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 back of the front panel.
c Secure the cover with the screws you removed earlier from the back and
sides of the chassis.
11 If your system was previously mounted in a rack, reinstall the rack-mount
brackets on the chassis and remount the system.
12 Make sure the power switch is off (O is pressed down). Plug the power cord
into the power supply and the outlet.
13 Turn on the system.
Replacing the Backplane To replace the backplane in the 8-Slot chassis, follow these steps. You will need
a short #1 Phillips screwdriver and Phillips screwdriver to fit a #6-32 screw.
1 Turn off the system and unplug the power cord from the outlet and
the power supply.
2 If your system is mounted in a rack, remove it from the rack and remove the
rack-mount brackets from the chassis.
3 Remove the cable strain-relief bracket, if it is installed.
4 Remove the main processor module and all I/O modules from the chassis.
Loosen the thumbscrews and push the ejector levers open to remove
the modules.
5 Remove the power supply from the chassis.
a Remove the six screws that secure the power supply to the chassis.
b Grasp the handle on the power supply and pull it out of the chassis. You
may feel slight resistance as the power supply connector disconnects from
the backplane.
6 Remove the cover from the chassis.
a Remove the screws from the back and sides of the chassis.
b Slide the cover toward the back of the chassis and lift it off.