System Box,
Continued
System Box
Control Panel
The controls and indicators for the system box are located behind
the flip-down door on the front bezel (Figure 3–3) of the box.
Figure 3–3 System Box Control Panel
Front Door
On/Off Switch
Halt Button
Audio Selector Switch
Handset Jack
Alternate
Console
Switch
Diagnostic
Lights
MLO-005090
ON/OFF Switch This switch, located on the upper left side of
the front bezel and labeled O I, controls ac power to the H7819-
AA power supply. The switch does not affect the ac power outlet
provided for add-on peripherals at the rear of the system box.
Power OK LED This small green indicator is visible on the
upper left side of the front bezel. The LED is on when ac power is
applied and the correct output voltage levels are present.
Handset jack This is a four-pin, MJ-type connector.
Audio selector switch This switch selects between speaker
output and headset output.
Continued on next page
3–8