Using the System Unit
2-3
The Operator Panel
The Operator Panel complex is installed on the front of the main unit. To access the
operator panel you have to open the front door.
The Operator Panel elements are controlled by the CPU and by a special microprocessor
located on the I/O card called SystemGuard.
Operator Controls
Operator Panel Display
Reset/Scroll
Button
Key Mode Switch
Power Light
Power Button
Diskette Drive
Normal
Secure
Service
Power Button
Used to switch the power to the system on or off
Power Light
Green LED: when lit, indicates all voltages in the power supply
are present and within specified limits and all fans are running.
The power-on light is also used to help analyze power and
cooling problems.
Reset/Scroll Button
Used to reset the system unit, depending on the position of the
key mode switch. Also used to scroll the messages on the
Operator Panel Display.
Operator Panel Display
Displays status indication of the system
Key Mode Switch
Is a key controlled switch with three positions labeled:
, and
.
Diskette Drive
Used to read and write diskettes
The key mode switch functions are enabled only when power is present in the base unit,
that is, the base unit main power switch on the back of the unit is in the ON position.
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