JVC 250 Service Manual page 151

Chapter 7---Troubleshooting
to the Arc Lamp Power Supply low. The Arc Lamp Power Supply delivers 170 V
to the Igniter, which generates a 32 kV pulse to the Arc Lamp and the Arc Lamp
lights. Once the Arc Lamp lights, the Arc Lamp Power Supply, the /LAMP_LIT
signal goes low and the voltage to the Igniter drops to between 25 V and 31 V.
The voltage from the Arc Lamp Power Supply stays at a steady output of 2 kW
during normal operation of the projector.
When the projector receives a power OFF command, the /LAMP_LIT and the
/LAMP_ENA signal both go high. This shuts off the Arc Lamp Power Supply.
The /FAN_ENA signal stays low for an additional ten minutes allowing the
cooling fans to cool down the Arc Lamp, the Light Pipe and the PCBs. After ten
minutes, the /FAN_ENA signal goes high, shutting off the cooling fans.
Model 250 Service Manual 7-13