Replacing The Backplane - 3Com NETBuilder II Installing Instruction

Replacing the Backplane

Loosen
back panel
screws.
To replace the backplane in the Extended chassis, follow these steps:
CAUTION: The following procedure is provided only for qualified service
personnel. There are no user serviceable parts inside the backplane.
1 Disconnect all power cords from the power supplies and power outlets.
2 Remove the main processor module, all I/O modules, the front panel, floppy disk
drive, flash memory drive, and power supplies that are installed in the chassis.
3 Loosen the two captive screws in the back panel, and remove the back panel.
Then remove the 20 mounting screws on the backplane and remove the
backplane.
The screws are identified in Figure 3-19 by small arrows on the backplane.
Swing back panel out and pull up to remove.
Figure 3-19 Replacing the Backplane in the Extended Chassis
4 Install the replacement backplane with the same screws.
5 Reinstall the back panel, and reinstall all I/O modules, the main processor
module, floppy disk drive, front panel card, flash memory drive, and power
supplies.
6 Reconnect the power cords.
Maintenance and Repair
Remove 20 backplane mounting screws.
3-17