Technical data

The temperature warning indicator shows that the system’s internal

temperature is approaching a level that may cause system components to

overheat. If the internal temperature raises unacceptably, you will hear an

audible pulsing sound and the temperature warning indicator will ﬂash.

The sound and visual marker are warning you of a possible temperature

condition, before the system automatically shuts down. This feature allows

you time to take corrective action. You could lower the room’s temperature,

remove airﬂow obstructions, or perform an orderly system shutdown to

prevent data loss.

The green DC OK indicator shows that the voltages are within the correct

operating range. If the DC OK indicator is not lit when the system power

is on, then a problem exists with the power supply.

Below the DC ok indicator are the Halt and Restart button indicators. The

Halt button is a two-position button. When pressed, the system halts and

the Halt LED is lit as the console mode prompt (>>>) is displayed on the

terminal screen. Before you can enter console commands, press the Halt

button again to return it to the out position. Now you can enter console

commands. If by mistake you press the Halt button, type C and press

Return to continue.

CAUTION: Pressing the Halt button halts the system unconditionally, in

spite of setting the Break Enable/Disable switch on the console module.

The Run/Restart button/indicator is located below the Halt button indicator.

When pressed, the system returns to a run or reboot condition. If you have

speciﬁed a device as the boot device and if the Break Enable/Disable switch

is set to Disable, the system will reboot the system software.

1.9 Enclosure Modiﬁcation

A system manager may request the following modiﬁcations to the SCP and

fan speed control.

Switches located on the SCP board can be used to disable the SCP button

functions. For example, if you were going to leave the access doors open

when training new people on the system this could prevent accidental

system shutdown.

When a system is located in an area where fan noise is more tolerable

to users, the speed of the fans can be increased. This action would take

advantage of a potential increase in system reliability, because the system

components function in a cooler environment.

BA430/BA440 Enclosure Description 1–13