JVC 250 service manual Convergence Deflection PCB - Inputs, Convergence Deflection PCB - Outputs

Chapter 5---Electronics

!Convergence output amplifiers for all colors and both horizontal and vertical axes

!Convergence enable and raster fill function

!ILA® assembly driver circuitry with temperature compensation

!Phase locked loop for ILA® assembly drivers

!IIC serial bus interface

Convergence Deflection PCB - Inputs

X_RGB_CONV - x-axis Convergence waveform from the System Controller PCB (the amplitude for full-scale correction is about 1 Vpp).

Y_RGB_CONV - y-axis Convergence waveform from the System Controller PCB (the amplitude for full-scale correction is about 1 Vpp).

CORR_SYNC - square wave from the System Controller PCB, logic level synchronization signal for the horizontal axis.

V_DRIVE - square wave from the Raster Timing Generator PCB, logic level synchronized to vertical sync with four horizontal line duty cycle.

WIDTH_CONTROL - a DC waveform from the Horizontal Vertical Deflection PCB that controls the image width.

IIC_CLK - IIC clock line.

IIC_DATA - IIC data line.

IIC_SINT - IIC interrupt line.

±15 V - input power from the Low Voltage Power Supply for the analog circuitry.

+5.1 V- input power from the Low Voltage Power Supply for the digital circuitry.

Convergence Deflection PCB - Outputs

RGB_ILA® (pos) - positive outputs to the ILA® for the red, green, and blue ILA® driver circuitry (about ±12 Vpp).

RGB_ILA® (neg) - negative outputs to the ILA® for the red, green, and blue ILA® driver circuitry (about ±12 Vpp).

H_PARABOLA - horizontal parabola for dynamic focus section of the High Voltage Power Supply.

V_PARABOLA - vertical parabola for dynamic focus section of the High Voltage Power Supply.

V_RAMP - vertical ramp waveform to the Horizontal Vertical Deflection PCB (about 4 Vpp).

V_PARABOLA - vertical parabola waveform to the Horizontal Vertical Deflection PCB (about 4 Vpp).

Model 250 Service Manual 5-29