Before replacing a CPU module, you must disconnect the standby battery and then remove AC power from the control panel to prevent equipment damage (Page 253) [1].
Because new modules are shipped with empty flash memory, you must also be prepared to download the cabinet configuration database to the replacement module (Page 255) [1].
Follow these requirements for substitution:
Disconnect the battery, then remove AC power (Page 253) [1].
Verify the replacement is the same model number as the original (Page 255) [1].
Ensure the substitute module has an identical LED/Switch display installed (Page 255) [1].
Identify the rail location to ensure the new module is installed in the same position (Page 255) [1].
Download the configuration database using the SDU after installation (Page 255) [1].
