JVC 250 service manual System Controller PCB - Inputs

Chapter 5---Electronics

Figure 5-5System Controller PCB I/O Diagram for other PCBs.

System Controller PCB - Inputs

/LV_OK - signal from the Low Voltage Power Supply; it tells the System Controller PCB that all the non-standby supply voltages are working.

/HV_OK - signal from the High Voltage Power Supply; it tells the System Controller PCB that all the high voltage supplies are working.

/LAMP_OK - signal from the Arc Lamp Power Supply.

/LAMP_LIT - signal from the Arc Lamp Power Supply; it tells the System Controller PCB that the Arc Lamp is lit.

ODD_FIELD - Square wave signal from the Raster Timing Generator PCB, with 50% duty cycle that is low during odd fields of an Interlace signal. This signal is high during noninterlaced signals.

5-6 Model 250 Service Manual