Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 777)

Section 15B
Replacement Procedures
15B-21
10. Locate the software option chip with this figure. With a dip extractor,
remove the chip from the processor board. You may want to label it
before storing it. When the new or repaired processor board is
received, replace the software option chip.
Remove with dip extractor
11. When you receive the new or repaired processor board, make sure you:
replace all 12 screws you removed
replace your option chip
replace your flash memory SIMMs
reconnect all cables to the processor board.
12. Reattach the power supply to the enclosure and reconnect all cables
to the power supply.
13. Turn power on to the control. If it does not power up, check all
connections.
14. When the control is running, replace the front cover and attach with
its four screws.