Chapter 3---Electrical
3-10
Model 250 Service Manual
Figure 3-4
High Voltage Power Supply I/O signals.
HVPS - Inputs
HVPS_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 to
horizontal sync.
/HV_ENA - The HVPS shutdown signal from the Video Amplifier PCB
(/VA_OK).
H_PARABOLA - The horizontal parabola from the Convergence Deflection PCB
used by the Dynamic Focus Amplifier.
V_PARABOLA - The vertical parabola from the Convergence Deflection PCB
used by the Dynamic Focus Amplifier.
± 15 V. - The power source for the analog circuitry in the High Voltage Power
Supply.
+ 80 V. - The input power for the High Voltage section of the High Voltage
Power Supply.
HVPS - Outputs
G1 Supply - goes to Video Amplifier PCB
G2 Supply - goes to Video Amplifier PCB
/HV_OK - goes to System Controller PCB
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