Chapter 2 System Controls; System Unit Controls; System Unit Controls For The Model 400T And 400Dl - HP 400 Series Servicing Manual

This chapter describes the system unit controls, monitor controls, and LED indicator
lights for the Series 400 systems.
2.1

System Unit Controls

This section describes the controls for the Series 400 system units.
2.1.1

System Unit Controls for the Model 400t and 400dl

Figure 2-1 shows the locations of the following switches on the Model 400t and 400dl
system units:
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•
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The Power switch controls the supply of dc power to the system unit.
The SERVICE Mode switch, when pressed, toggles the operating mode of the
system between NORMAL and SERVICE mode. When the system is in SER-
VICE Mode, the LED labeled "Service" on the front panel is on.
The Reset switch invokes a system reset.
Chapter 2
System Controls
System Controls 2-1