Chapter 3---Electrical3-10 Model 250 Service ManualFigure 3-4 High Voltage Power Supply I/O signals.HVPS - InputsHVPS_SYNC - this signal is generated on the Raster Timing Generator PCB.Square wave HCT level with 50 or 33% duty cycle. The signal is synchronized tohorizontal sync./HV_ENA - The HVPS shutdown signal from the Video Amplifier PCB(/VA_OK).H_PARABOLA - The horizontal parabola from the Convergence Deflection PCBused by the Dynamic Focus Amplifier.V_PARABOLA - The vertical parabola from the Convergence Deflection PCBused by the Dynamic Focus Amplifier.± 15 V. - The power source for the analog circuitry in the High Voltage PowerSupply.+ 80 V. - The input power for the High Voltage section of the High VoltagePower Supply.HVPS - OutputsG1 Supply - goes to Video Amplifier PCBG2 Supply - goes to Video Amplifier PCB/HV_OK - goes to System Controller PCB
