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Adjustment Procedures
1780R-Series Service Manual
5–47
ah. Touch the GO TO DIFF PHASE pad on the Vectorscope CRT. Check
that DOUBLE is selected.
ai. Press the button located below the left CRT. Use the VERT and HORIZ
POS controls to position the vector center dot to the center of the
Vectorscope CRT. Rotate the Precision Measurement control to position
the vector dot to the 180° reference line.
aj. Adjust DP Zero (A6C172) to overlay the chroma lines using the first
packet.
ak. Push the MEASURE button to exit this mode.
al. Disconnect the Linearity test signal and the Black Burst signal from the
1780R-Series instrument.
Figure 5–17: Noise Reduction-ON. DAC offset properly adjusted