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Chapter 2 23
Indicators, switches, and displays
Operator panel
Key switch panel
The key switch panel is located on the left of the operator panel, as
shown in Figure 13 on page 22. The key switch panel contains a two
position key switch, a DC ON LED, and a TOC (Transfer Of Control)
button, as shown in Figure 14.
Figure 14 Key switch panel
Key switch
The key switch has two positions:
• DC OFF
DC power is not applied to the system. Placing the key switch in this
position is the normal method for turning off power to the system.
• ON
DC power is applied to the system. POST (Power On Self Test) begins
executing and brings up the system from an indeterminate state and
then calls OBP.
DC ON LED
This LED indicates that DC power has been applied to the system.
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DC OFF
DC ON
TOC
ON