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Theory of Operation
3–70
1780R-Series Service Manual
Diagram 27 Vector Timing & Blanking
The Vectorscope display selection, chroma clamp, center dot clamp, and SCH
blanking signals for the Vectorscope are generated by the Vector Timing circuits.
In addition, the switching of the SCH and Vectorscope chrominance signals
occurs on this schematic.
Input signals to the Deflection Amplifiers drive the Center Dot Comparator. If
the amplifiers are not deflecting the CRT beam away from CRT center, the
comparator generates a pulse, input to the Center Dot Blanking Logic, that
generates a vectorscope blanking signal to the Z-Axis Amplifier.
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