Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 766)

Section 15B
Replacement Procedures
15B-10
In the case of hardware failure, you may be required to replace the CPU
board. When you remove the CPU board from the enclosure, you also must
remove the flash memory SIMMs and the shadow RAM SIMMs. To
replace the CPU board:
1. Turn OFF all power to the control.
ATTENTION: To guard against electrical shock hazards, never
make connections or disconnections at the AC distribution
network unless the main AC disconnect switch is open and
locked.
2. If there is a cable connected to the RS 232 port (port A) disconnect it.
3. Remove the Phillips head screws at the top and bottom of the CPU
board’s face panel. Use Figure 15B.1 to locate the screws.
4. Use a flathead screwdriver to pry the board’s faceplate a few inches
from the component enclosure. Use Figure 15B.1 to find the pry point
on the faceplate.
Figure 15B.1
Removing the CPU Board from the Component Enclosure on the 9/260
and 9/290
Remove this screw
Remove this screw
Use a screwdriver at this point to pry
the module away from the chassis.
15B.3
Replacing the CPU Board on
the 9/260 and 9/290