Chapter 2—Functional Descriptions
Model 330, 340SC and 370SC Service Manual 2–9
*Current depends on projector model (see Table 0-1 in Safety Chapter).
** Model 340SC = 2000 Watts; Model 370SC = 3000 Watts.
Figure 2-4
System Power Supply Input/Output Diagram
Arc Lamp Ignitor
The ignitor consists of a step-up power supply, a spark gap, and a transformer.
The Arc Lamp Ignitor is mounted under or next to the Arc Lamp. It provides the
high voltage pulse necessary to ignite the Xenon Arc Lamp that is the illumination
supply for the HJT Model 330, 340SC and 370SC projectors.
The System Power Supply’s Arc Lamp Supply section provides the necessary
voltage to activate the ignitor and to sustain the arc in the Arc Lamp once it has
been ignited. The SPS provides the power necessary to operate the ignitor.
The Ignitor is only active during the time between the Arc Lamp Power Supply
energizing and the Arc Lamp igniting. During steady state operation and when the
projector power is off, the ignitor is inactive.
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