Enhanced Support Facility 2.6 User's Guide

1.2.3.4 Other Switches

The operation panel also contains the REQUEST and RESET switch. These switches are not used during normal operation.
The RESET switch resets the system. It only works when the MODE switch is set to MANUAL/MAINTENCE. Normally, the operation by which RESET switch is pressed is prohibited. However, please execute the memory dump save by REQUEST switch when it is necessary to reset the system by an unexpected situation. After the memory dump is saved, the system is reset.

It only works when the MODE switch is set to MANUAL/MAINTENANCE. This operation is only for maintenance purposes and problem analysis and improper use can cause the destruction of the system.
Please do not operate of the REQUEST switch, except when the system should save the memory dump by the purpose of an abnormal state or problem analysis.
The memory dump might fail to be saved in some system conditions.