JVC 250 ユーザーズマニュアル

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Drive the main horizontal deflection coils to provide horizontal raster scan
for the CRTs

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Drive main vertical coils to provide vertical raster scan for the CRTs

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Horizontal raster centering for all three colors

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Switch mode power supply generating the required proportional DC
supply

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Horizontal width adjustment

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Horizontal retrace switch network

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Left/right pincushion and keystone correction

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Vertical linearity adjustments individually for all three colors.

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Vertical raster centering for all three colors

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IIC interface.

H_BAND:0-3 - horizontal scan frequency bands, from Raster Timing Generator
PCB.

/H_ENABLE - from the Raster Timing Generator PCB, enables the horizontal
deflection supply. Low = enabled deflection, High = disabled deflection.

H_DRIVE - square wave from the Raster Timing Generator PCB, 50% duty cycle
synchronized to the selected horizontal sync.

H_F2V - a DC voltage from the Raster Timing Generator PCB, proportional to
horizontal frequency

H_LOCK (neg.) - Deflection Yoke Connector Interlock return from the Scan
Reversal PCB.

DEFL_OK - deflection status signal from the Scan Reversal PCB (high = good,
(about 2 V), low = no scan).

V_RAMP - vertical ramp waveform from the Convergence Deflection PCB,
(about 4 Vpp).

V_PARAB - vertical parabola waveform from the Convergence Deflection PCB,
(about 4 Vpp).

FRONT/REAR - front or rear projection status line from the Scan Reversal PCB.
(FRONT = low, REAR = high).

FLOOR/CEILING - floor or ceiling projection status line from the Scan Reversal
PCB. (FLOOR = low, CEILING = high).