Service manual

System Overview 1-13
The callouts in Figure 1–6 point to these components on the control panel.
Secure LED – When lit, indicates that the keyswitch is in the Secure
position and system is powered on. All pushbuttons and SCM functions
are disabled, including remote access to the system.
Power OK LED – When lit, indicates that the system is powered on and
remote console operations are enabled. (Keyswitch in On position.)
Halt LED – When lit with the Power LED, indicates the system is powered
on, remote console operations are enabled, and the Halt pushbutton is
pressed. A HALT IN command issued at the remote console does not cause
this LED to light.
When lit with both Power LED and Secure LED, indicates a powered on
system, disabled remote console operations, and Halt pushbutton is
pressed in.
ASCII/graphical vacuum fluorescent display that displays a maximum of
four 20-character rows of ASCI text or a small 120 x 32 dot graphic. See
Section 2.1.2 for a list of messages.
Off switch position – System is powered off and cannot be powered on
remotely. No LEDs are lit.
On switch position – System is powered on and can be remotely powered on
or powered off. (The power LED should be lit.)
Secure switch position – System is powered on and cannot be remotely
powered on or off. All pushbuttons and SCM functions are disabled. (The
secure LED should be lit.)
Halt pushbutton – Pressing this pushbutton causes the operating system
to perform a halt, and prevents the console from booting the operating
system. The halt stays in effect until the Halt pushbutton is pressed again.
Pushing the Halt button affects the entire system and all partitions in it.
Fault pushbutton – Pressing this pushbutton causes a system fault without
clearing captured error information in control and status registers. All
partitions are reset. After a fault is generated, the system will
automatically reset if AUTO_FAULT_RESET is enabled.
Reset pushbutton – Pressing this pushbutton causes a system reset that
clears captured error information.