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Adjustment Procedures
1780R-Series Service Manual
5–35
e. Disconnect the equipment from CH B3 INPUT.
f. Disconnect the termination from the PIX MON OUT connector.
27. Adjust Luminance Filter Transient Response (Chroma Rejection)
a. Connect a Color Bar signal to the 1780R-Series CH A INPUT. Termi-
nate the opposite side of the loop-through into 75 W.
b. Select INPUT-CH A, FILTER-LUM, and WFM HORIZONTAL-TWO-
LINE mode of operation.
c. Adjust Lum Trans Resp (A2L947, A2L951) for squarest leading corner
on the white bar.
d. Select FILTER-FLAT mode.
e. Leave the Color Bar signal connected to the instrument.
28. Adjust Luminance Filter Gain
a. Check that the television test signal generator Color Bar signal is applied
to the 1780R-Series CH A INPUT. Check that this input is terminated
into 75 W.
b. Select FILTER-FLAT/LUM overlay. (To obtain the FLAT/LUM overlay
mode, press the FILTER button and hold in until the FLAT and LUM
buttons are lit.) Select WFM HORIZONTAL-ONE-LINE mode of
operation.
c. Adjust Lum Gain (A2R747) and Lum Offset (A2R743) to overlay the
blanking levels and white bars of the one line display.
d. Leave the Color Bar signal connected to the 1780R-Series CH A INPUT.
29. Adjust Low Pass Filter
a. Select 1780R-Series FILTER-LPASS.
b. Adjust LP Trans Resp (A2R1050) for best square corner on the curved
leading edge of the white bar.
c. Select FILTER-FLAT.
d. Disconnect the Color Bar signal from the CH A INPUT.
30. Adjust Chrominance Filter
a. Connect the output of the leveled sine wave generator, through the
50 W-to-75 W minimum loss attenuator, to the 1780R-Series CH A
INPUT connector. Check that this input is terminated into 75 W.
b. Check that FILTER-FLAT mod is selected.