Gateway ALR 9200 Maintaining And Troubleshooting page 34

Main Power Connector, Secondary (Z)
The primary power connectors provide the majority of the power to the
system board. These connectors are designed to accommodate the power
supply installed in the system.
Auxiliary Power Connector (EE)
The auxiliary power connector provides for the connection of an additional
power source.
22 Maintaining and Troubleshooting the Gateway ALR 9200 Server